News and Events - "All News and Events"

Welcome to our newsroom! Here you will find the latest information about our company, projects and people. Browse articles published by our engineers and scientists in national publications and conference proceedings, view our press releases and read through news coverage of Terracon.

If you are a member of the media, you may contact our media relations representative at media@terracon.com.


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Going the Distance: Managing budget constraints and contractor issues for Clemson University’s Performing Arts Center Project

Brooks Center ExteriorAny firm can look good in front of its client when a project is going smoothly and the budget is more than sufficient to complete all objectives.  The firm looks good for bringing the project in under budget while accomplishing more.  But what if tight budgets do not allow an Owner to accomplish the amount of work that is desired, and he has more needs than there are funds?  And to top it off, when the bids come in, he is enticed by that low bid number despite experience telling him that something is likely missing.  More often than not, the client will take a chance, or has no lawful reason to reject the low bid.  Often, the contractor’s quality is sub-par as he attempts to cut costs to make up for the low bid thus resulting in reduced quality or increased costs to the Owner for monitoring and managing of the project.   Construction schedules suffer, and unpleasant conversations take place to bring the project back on track.

Clemson University found itself in that very scenario during the roof replacement for the University’s iconic Brooks Center for the Performing Arts.

Reducing Costs, Maintaining Quality

brooks center roof

Clemson University desired to have complete tear-off, upgrading of insulation, and replacement of the roof.  When first approached to perform the Brooks Center roof replacement design, the Terracon team conducted field work to establish the project needs and quickly determined the university’s $600,000 budget would not adequately cover the costs of complete removal and replacement of the structure’s 20-year-old roof.  Additionally, Terracon performed destructive testing of the masonry and determined water intrusion was also related to poorly installed through-wall flashings.  These would need to be corrected to assure wall leaks did not occur once the new roofing system was completed.  This would add costs to an already tight budget.

Terracon presented a viable option to Clemson University.  After much research and conversation with the South Carolina Office of the State Engineer, Terracon performed a moisture survey using thermal imaging followed by destructive testing to determine the quantity of wet insulation.  The majority of the existing insulation was dry, and could be reused in the roofing project.  The savings associated would allow for roof membrane replacement at all areas as well as accomplishing through-wall flashing replacement at walls above roof levels.  The roof membrane installation was designed as a mechanically attached system which further reduced labor costs and adhesive material costs.

With a new roof system design and identified cost savings bringing the project within Clemson’s budget, the project went to bid. Four bidders came in under the budget.  The Low-Bid was significantly less than the other three.  The Low-Bid was a firm unknown to both Terracon and the University.

Once work began, the Terracon team conducted periodic inspections of the ongoing roofing work. During an inspection, the team identified through-wall counterflashing installation that was not completed in accordance with the documents and did not meet industry standards.  Through-wall flashing that is not installed correctly may allow water intrusion into the roof system as well as the building interior space.  Through-wall flashing is flashing that is embedded within the wall and bridges wall cavities to divert moisture that penetrates masonry walls away from the cavity and back to the exterior.  At roofs, through-wall flashings are placed above the roof system flashings, and can be used for attachment of the roof metal counterflashing.  End dams must be placed at key locations to ensure moisture does not run off the ends of the through-wall flashings and into the building.

Partnering for the Duration

masonry investigation

The through-wall flashing work cannot be observed once the masonry is installed.  Due to observations of deficient through-wall flashing of ongoing work by Terracon during periodic site visits, destructive testing was performed at random locations to determine the general quality of installation where through-wall work was completed.  The contractor’s position was that the through-wall flashing was installed per the design documents and no leaks had been reported to date.  Once a report was issued with photographs showing deficiencies such as poorly installed end dams, unsealed laps and corners, and improper materials, the contractor agreed to correct the work.  Due to schedule and work quality concerns, Clemson University engaged Terracon to provide full time inspection of the through-wall flashing installation.  Terracon provided an RRC on site for approximately two months.

Terracon facilities experts continued close contact with Clemson University, stepping up when needed to identify and resolve problems in a professional manner.  The project began with a tight budget, took a hit with expensive and unexpected through-wall flashing work, endured contractor performance issues, but concluded with Clemson University’s objectives and budget being met.  Terracon is experienced in working within budget constraints, providing viable options to the Client, managing contractors, and delivering an excellent final product to the Client.


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Terracon’s Commitment to IIF Culture Showing Results

Company’s commitment to safety benefits employees and clients

OLATHE, Kan. — Terracon, a leading national engineering consulting firm with a personal and uncompromising commitment to everyone going home safe to their family each and every day, announced a record-low rate of work-related injuries in 2016.

As part of Safety Week 2017, May 1 – 5, Terracon will use the theme “How I Show Up for Safety” to share safety best practices through an internal best practices video challenge, daily posts on its social media platforms, and website. To see some of these short, informative videos visit http://ow.ly/mAjO30bkBad.

Terracon, which has made a dedicated commitment to achieving an Incident and Injury-Free (IIF) workplace since 2011, reported a Total Recordable Injury Rate (TRIR) of 0.48 last year. Improvements in safety over the past five years have yielded impressive results. For example, in 2011 the TRIR was 2.5. If that rate had not declined over the years, an additional 110 Terracon employees could have been injured in 2016.

At Terracon, the key to a better safety record lies in the establishment of strong institutional processes to ensure consistent improvement. For example, strengthening of the company’s Core Safety Rules and Practices in 2016 included the prohibition of cell phone use while driving and the establishment of warming up for work as a core practice. Terracon also added a Safety Check-In program, which reinforces positive work practices and corrects less-safe work.

Internal information technology tools also provide support to employees who are making decisions that impact safety including launch of the Safety Dashboard, a Safety History and Documentation desktop application, and a Near Miss mobile app which helps track near misses in real time. Terracon’s 2016 Safety Week campaign, “Like a Champion” was a recent winner of a Society of Marketing Professional Services Kansas City marketing and communications award. See the playlist.

Terracon is a member of the Construction Industry Safety Initiative (CISI), together with their 40 partner groups and sponsors. For more information visit http://www.constructionsafetyweek.com/

Terracon is an employee-owned engineering consulting firm with more than 4,000 employees providing environmental, facilities, geotechnical, and materials services from more than 140 offices with services available in all 50 states. Terracon currently ranks 30th on Engineering News-Record’s list of Top 500 Design Firms. For additional information about Terracon, visit www.terracon.com.


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Incentive for Innovation: Assessment Strategies for Tax Incentives Drive Brownfield Site Redevelopment

Site Excavation and Soil StockpileSafely restoring a contaminated property and helping find purpose in its reuse is one of the most rewarding opportunities an environmental consultant can have. It requires a collaborative team with the creative vision to see beyond the condition of an existing site and instead see the possibilities for redevelopment.

With visions of a new hotel anchoring a project site located within a designated brownfields area in downtown Tallahassee, Fla., the owners of MountainShore Properties, Inc., initially knew they were in need of a partner to perform a Phase I Environmental Site Assessment (ESA). With knowledge and experience far beyond assessment, Terracon was able to support a successful brownfield site redevelopment using innovative assessment strategies and available incentives.

Identifying Complexities and Navigating Assessment Obstacles

Terracon was selected by MountainShore Properties, Inc. to perform the Phase I ESA based on an existing client relationship founded on a number of previously successful projects. Utilized as a storage and dry goods transfer/loading facility dating back to the early 1900s, the historic site was traversed by three rail spurs. Adding to the development project’s complexity, the Phase I ESA revealed recognized environmental conditions (RECS) associated with impacts to soil related to historic industrial activities that presented an obstacle for site redevelopment.

Following review of the Phase I ESA, Terracon was contacted to facilitate a site assessment. The team knew that if the assessment resulted in a recommendation for site remediation, development of the hotel could only occur if a Site Rehabilitation Completion Order (SRCO) without restrictions from the Florida Department of Environmental Protection (FDEP) could be achieved. The desired SRCO certifies the site as being remediated to regulatory limits with no need for future environmental cleanup.

Our team developed a large-scale comprehensive conceptual site model to adequately assess the site for chemicals of concern (COCs) while gathering data to support an arsenic as natural background assertion. The assessment incorporated the use of offsite and select onsite background sample locations to calculate specific background arsenic concentrations, integrated clay mineral X-ray diffraction testing, grain size sieve analysis, and statistical modeling of laboratory data to definitively prove arsenic was naturally occurring and not originating from human activity. The assessment also documented several metals and low level petroleum constituents in the top 2-feet of site soils. No groundwater impacts were identified. A combined document, Site Assessment Report and Remedial Action Plan, was submitted to the FDEP and subsequently approved. Arsenic was considered naturally occurring below two feet and consequently the top two feet of the site was excavated for proper disposal.

Utilizing Incentives

Terracon further assisted the client by identifying and obtaining tax credits under the Florida Brownfields Voluntary Cleanup Tax Credits (VCTC) Program. Through the VCTC program our client recovered fifty percent of cleanup costs in state corporate income tax credits. These tax credits have an estimated value of 85 cents on the dollar. In addition, because the site is in a brownfields area, it is eligible for tax incentives of $2,500 per future hotel employee.

Our team developed a close working relationship with FDEP which proved paramount to the success of this project. A SRCO was achieved for the property within a year of site assessment initiation. With the brownfield order closed, the owners are currently in the process of redeveloping the site and building a hotel. Terracon is also conducting the construction materials testing and threshold inspections for the hotel construction, and conducted the geotechnical evaluation and recommendations
for the hotel project.

 


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Terracon Announces Plans for New Headquarters

Company to build $21 million facility in Olathe

OLATHE, Kan. — Terracon is pleased to announce the next phase of its growth will occur close to home. The company will build its new $21 million corporate headquarters in Olathe, keeping nearly 200 employees close to the company’s existing location.

Currently located on two non-adjoining floors in the Corporate Ridge Office Park near Kansas Highway 10 and Ridgeview Road, Terracon’s new facility will be just south, neighboring the John Deere sales and marketing center. As sole occupant of the two-story, 65,000-square-foot office building, the company sees the move as an opportunity to support its growth and expansion plans.

“Terracon is focused on growth as evidenced by our internal expansion and acquisition activities,” said Gayle Packer, Terracon’s chief administrative officer. “Our strategic plan guides us to continue growing at a rate of 10-15 percent each year, and we expect that the employment base at our corporate office will increase accordingly.”

Terracon Announces New HeadquartersOlathe has been home to Terracon for more than 10 years. Since 2007, the company has grown from $335 million in revenue to more than $580 million. The announcement follows Terracon’s acquisition of five smaller firms on both coasts in 2016. Terracon credits a successful partnership with the City of Olathe and the engagement of city officials in helping make the new building possible.

“We would like to thank our partners at the City of Olathe and the Kansas Department of Commerce in assisting us in our expansion,” said Don Vrana, Terracon chief financial officer.

“This investment represents the passionate commitment of our employee-owners to progress our growth,” said Swaminathan Srinivasan, who was named as Terracon’s new president earlier this year. “Inspired by new surroundings, we will focus our future on serving clients in new, innovative ways and seeking out opportunities to make positive impacts on the communities where we live and work.”

The property is owned and will be developed by a design-build team led by VanTrust Real Estate. Though Terracon is working through the design details, the office will emphasize collaborative spaces including a new training conference center and expanded amenities. The new building is scheduled for completion in the first quarter of 2018.

Terracon is an employee-owned engineering consulting firm with more than 4,000 employees providing environmental, facilities, geotechnical, and materials services from more than 140 offices serving all 50 states. Terracon currently ranks 32nd on Engineering News-Record’s list of Top 500 Design Firms. For more information, visit terracon.com.


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Modified Bitumen Roofing: A High Performance Option

No one cares about the roof… until water is dripping on your new computer.  A leaking roof is one of the leading causes of mold growth, inventory damage and destruction of building components such as walls, ceilings, finishes and furnishings not to mention computers.  While roof systems often account for less than 50 percent of the total building enclosure, defective roofing easily accounts for the lion’s share of building construction litigation.

Historically, built-up roofing (BUR) was the mainstay in low-slope roofing.  Many practitioners and owners were devoted to it for a variety of reasons, not the least of which were the durability and the redundancy of multiple layers.  Nevertheless, BUR has lost considerable market share due to costs, safety, environmental concerns, lack of skilled applicators and being just plain messy. 

A modern day alternative is modified bitumen roofing, also known as “modifieds,” or “mod bits.”  Modified bitumen roofing has evolved as a high performance option to built-up roofing.  The waterproofing component in both systems is asphalt. While the quality of a BUR system is highly dependent on the skill of the guy mopping the hot asphalt (a dangerous job), with modified bitumen roofing the asphalt is applied to the reinforcing mat in the factory resulting in a more consistent product.

The reason it is called “modified” is because the asphalt is modified with elastomeric polymers that add elasticity and durability to the sheet. Installation of these systems is very similar to BUR but with far fewer safety concerns and far less mess. Modifieds can be applied with hot asphalt but are often applied with adhesives or with the “torch down” method thus eliminating much of the mess and improving safety. Roofing contractors who have historically installed BUR are familiar with modified bitumen roof systems and have easily transitioned to those systems.

Many of Terracon’s clients prefer modifieds.  Mecklenburg County Government in Charlotte, NC has utilized modified bitumen roof systems on the majority of their facilities including office areas, television stations, gymnasiums, courthouses, detention centers and natatoria over the past 10 years.  Each case is unique, requiring the modified systems to be designed to accommodate the varying conditions such as high interior vapor drive for pools and gyms. Modified systems meet code requirements for most low slope applications including fire and wind uplift classifications.

Ease of Use

These facilities are almost always occupied during construction and the work proceeds without significant interruption to day-to-day operations. Mecklenburg County facilities have various roof-top equipment requiring routine maintenance. Modified systems can withstand routine maintenance foot traffic without impairing long-term performance. Walkway materials, supplied by the mod bit manufacturers can be easily applied for areas of heavier traffic. The systems are durable and require low maintenance, which is a significant advantage for the County. The fumes from the cold adhesive are manageable and typically not a problem for the County or the building occupants and are certainly far less than the fumes from the old BUR asphalt kettles.

Various roof systems are available and most have their place in the construction industry provided they are carefully selected and detailed for the conditions encountered.  Modified bitumen is a viable option where durability, redundancy and low maintenance are critical and should be given careful consideration.


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State Farm Center: Flyin' Again

U of I State Farm CenterThe year was 1989 and as a student of the University of Illinois, I was witness to one of the greatest teams to ever grace the floor of Assembly Hall; home of the “Flyin Illini.” It was an exciting time to be a fan as the team was taking the college basketball world on a breath-taking flight all the way to the NCAA Tournament Final Four. Twenty-three years later, I was proud to be a member of another great Illini team; the team tasked with designing and overseeing the $170 million renovation of Assembly Hall, now the State Farm Center.

The State Farm Center serves as the main indoor sports and entertainment arena at University of Illinois at Urbana/Champagne (UIUC) and is listed on the National Register of Historic Places by the Illinois Historic Preservation Agency for its historical and architectural significance chiefly due to the structure’s reinforced concrete dome/bowl configuration that exhibits one of the largest examples of this type of construction in the world.

Protection from Hazardous Materials Exposure

U of I arena constructionUniversity of Illinois basketball court

 

 

 

 

 

 

In any demolition or renovation project, there are potential environmental risks associated with exposure to hazardous building materials. Beginning in 2012, our 13-person team provided asbestos, lead-based paint (LBP) and industrial hygiene consulting services as a sub-consultant to AECOM, the project architect. Design phase services included comprehensive surveys for asbestos-containing materials (ACM), LBP, and universal waste items throughout the arena. Findings were documented in survey reports and presented graphically in the hazardous material abatement design drawings prepared for three separate bid packages.

The project design and abatement oversight services proved challenging with the decision to continue to utilize the arena throughout the construction period. The project work was performed in six phases, with major demolition activity typically corresponding to work during phases conducted during the basketball off-season (March to November). This meant that abatement of environmental hazards (when Terracon’s work was principally required) was compressed into tighter timeframes in the early days of the off-season to allow demolition and re-construction work to move forward as soon as feasible, and be completed before the beginning of the next season.

Big Time Scheduling Coordination

North mechanical room University of Illinois Orange Krush ClubAbatement oversight was closely coordinated with AECOM and UIUC’s construction manager, Turner-Clayco. The dynamic scheduling needs required almost 1,400 hours of Terracon oversight throughout the course of the project.   Demolition of the existing arena floor, lower seating bowl, and transformation of two existing mechanical rooms began the day after conclusion of the 2015 basketball season.  We were required to be on-site for approximately 20 hours per day, six days a week for three weeks totaling nearly 400 oversight man-hours.

When asbestos-containing waterproofing was discovered under the one-inch thick concrete topping slab in the north mechanical room, immediate removal was required. Terracon mobilized a team of asbestos professionals to provide 24-hour abatement oversight coverage for eight straight days to maintain the schedule and continue construction of the Orange Krush Club.

On November 29, 2016, the University, donors, Big Ten officials, and the design and construction management team attended the official State Farm Center re-dedication ceremony. This spectacular project was celebrated in style and topped off by the Illini men’s basketball team victory in the ACC-Big Ten Challenge, a great way to finish off a great project. Go Illini!


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Beyond Drilling: Using Geophysics to Understand What's Beneath the Surface

ERI Foot SpacingDrilling and soil sampling has traditionally been the way to explore subsurface conditions. But what if your project site encompasses 18 acres and you know that highly variable conditions exist? Consider a site where drilling and sampling alone can’t sufficiently characterize the site.

Terracon’s regional geophysicists collaborate with our engineers and geologists to design the optimal geophysical survey to meet the client’s budget and needs. Terracon has an arsenal of geophysical tools and methods to supplement and complement these more traditional site characterization methods. Electrical Resistivity Imaging (ERI), is one such geophysical method and is a great tool for locations where drilling and sampling alone can’t get the job done. ERI measures relative average electrical resistivity of subsurface materials—or how strongly a given material opposes the flow of electric current—then processes the values into a 2-D cross-section of the subsurface beneath the survey line.

Geophysical methods such as ERI allow the identification of conditions underneath an entire area, as opposed to drilling and sampling soil borings which provide a finite extent of subgrade data at discrete locations. Using ERI as the first step in geotechnical site characterization is a perfect way to develop a smart exploration plan whereby borings and other intrusive sampling methods can be focused in critical or high interest areas identified by the ERI.

Starting an exploration program with ERI data may actually allow the reduction in the overall number of soil borings while painting a more thorough picture of the subsurface when complex geological conditions exist. Terracon’s team of geophysicists work with our geotechnical engineers to blend the use of geophysics with traditional drilling and sampling to better understand the subsurface in ways that have historically been impossible.

ERI In Action

Sometimes it’s not just geology that can create a complex subsurface that requires geophysics to understand. A client recently asked Terracon for help determining the condition of an area which formerly housed multiple coal mines.

Because our client planned to develop the site for commercial use, determining the extent and condition of the mines was essential to plan for future development. The existence of a non-operational coal mine could cause settlement and other foundation issues.

Our team started the exploration process with ERI, which provided data to predict the presence of the mine areas to approximately 120 feet below the surface. Our geophysicists evaluated the data and delineated certain areas and depths as anomalies potentially associated with previous mining operations. The geophysical survey allowed us to determine intact and collapsed areas, and areas with voids. We were able to hand this prediction of mine locations to our geotechnical engineers to perform an intrusive exploration with traditional
soil borings to supplement and confirm the ERI results.

ERI measures relative average resistivity of subsurface materials—how strongly a given material opposes the flow of electric current—then processes the values into a 2-D cross-section of the area surveyed. ERI is usually performed in conjunction with or prior to drilling. It narrows down areas in need of further exploration to prevent “drilling blind.”

Revealing What Lies Beneath

This example is just one way that ERI can be used to reveal the subsurface conditions. We also recently used ERI to determine depth to bedrock below a guide wall at a lock and dam; identify karst (cave) features around a wind turbine farm; and locate water infiltration zones along levees. We even discovered a former tunnel near a clock tower.

Terracon has experienced geophysicists and the capability to execute numerous geophysical methods for site characterization throughout the entire country. In addition, NORCAL Geophysical Consultants, Inc. a Terracon Company, based in California, recently joined the firm greatly increasing our expertise in that region. The use of geophysics for subsurface characterization for geotechnical and environmental applications is rapidly growing. We continue to expand our knowledge of advanced geophysical methods such as ERI to bring reliable, cost-effective solutions to address the unique challenges of each site or project.


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Calling All Bats, We Hear You: Acoustic Sampling for Endangered Bats

Eastern Red Bat

Bats might not be the first thing that come to mind when planning a development project, but these unique and often protected creatures play a vital role in their ecosystem. In the summer of 2016, a team of scientists, biologists, and geologists were contracted to conduct a threatened and endangered (T&E) bat survey of a 590-acre wooded project site near Nashville. These types of presence or absence surveys are used to collect data, to determine a project’s potential impacts on area habitat, and, if a habitat is verified, provide recommendations for safe site development.

Due to the quantity of wooded land within the project, habitat was assumed to be present by U.S. Fish and Wildlife Service (USWFS). The site is located within the range of known federally-endangered Indiana bats and threatened Northern long eared bats.  As such, we knew on-site evaluation would be required to satisfy USFWS and the U.S. Army Corps of Engineers (USACE) requirements before federal permits could be released for the project.

Evaluating Options for Evaluation Survey

Typically for endangered bat evaluations, first a survey is conducted to determine if the project has bat-conducive habitat. Federal survey guidelines for bat evaluations allow two options for evaluating if T&E bats are present; mist netting or acoustic surveys. These guidelines are designed to determine if any of the trees within the project area are serving as a maternity roost. At times up to 100 adult bats can be found in these particular trees, which can be used year after year. If such a tree is located, it can be protected by federal statutes similar to a Bald Eagles nest depending on the species.

Anabat Acoustic RecordersBoth mist netting and acoustic surveys have limitations. Mist netting has been a standard method for evaluating bat populations for decades. This methods places thin-laced netting in a narrow tree corridor where bats are likely to fly at night. Scientists wait and during periods of bat activity, capture and identify bats. It is simple, safe, and effective method. However, issues arise in that many species won’t happen to fly through the selected corridor. The other major challenge is cost. Mist netting guidelines for central Tennessee recommend 9 net nights per 123 acres. This means two scientists staying approximately 45 nights – a method of evaluation quite costly for such a large area.

Acoustic survey sampling consists of setting up data recorders to monitor for sub-sonic sounds bats make to navigate at night while feeding. Each species has a particular set of calls, which can be identified by computer software with an accuracy rate of 75-80 percent. Guidelines for acoustic recording in the area recommend 4 detector nights per 123 acres or approximately 20 nights. In this sampling setup detectors are preset to record in the evenings and retrieved in the morning, eliminating overnight field stays and providing a more cost-efficient option.

Sampling Protects Natural Habitat

Grey Bat

One night of acoustic sampling yields approximately 2GB of data, which bat call computer software can filter in about two hours. During the project, Anabat II acoustic recorders collected 94,315 bat pulses, which the software filtered down into 2,074 total bat passes and identified 11 species, including one potential endangered Indiana bat. After consultation with USFWS, it was deemed only a few nights of mist netting were needed in limited locations to verify if endangered Indiana bats were actually present. The mist netting captured five species though none were Indiana bats. A federally-endangered Gray bat was captured, but as its roost habitat occurs only in caves, no impacts to the species were expected.

By combining the acoustic survey data with a traditional sampling method, Terracon was able to assist our client in navigating environmental rules and regulations while reducing the total cost of the project. The T&E survey provided conclusive results demonstrating that endangered species of bats would not be impacted and created a viable option for private development.


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Real-time Information Saves Time and Money: Maturity Meter Speeds-up Completion of Concrete Construction Projects

Maturity MeterMany materials testing activities are used to evaluate when certain construction activities can move to the next stage. Soil compaction testing of fill materials determines if additional fill can be placed or if paving or foundation work can begin. Concrete compressive strength testing dictates whether post-tension cables can be stressed or concrete formwork can be removed. Failing tests or insufficient test results can delay construction activities and impact the overall construction schedule.

Timely Reports Are Key to Decision Making

To assist our clients, Terracon focuses heavily on getting critical information to the project team quickly so a timely decision can be made. Our use of technology to efficiently collect and report our test results is key in making this happen. We also use technology to support how testing is performed to further create efficiencies in the construction schedule and accelerate the decision-making process. One area where we do this is in the testing of field cured cylinders for concrete form removal or post-tension cable stressing. Terracon can use the maturity meter method (ASTM Standard is C 1074 “Standard practice for estimating concrete strength by the maturity method”) to provide real-time data to be used to assess when form removal or stressing operations can occur or be used to augment when field cured cylinders should be tested.

We have found that with proper application, use of a maturity meter has the potential to save an average of one day per impacted concrete pour on typical commercial projects. In some cases, this has resulted in reducing a project schedule by months and saving thousands of dollars in construction costs.

Planning Leads to Effective Solutions

By taking time prior to the start of concrete placements or during initial concrete placements to use the maturity meter on initial batches of the approved concrete mix, maturity index values can be correlated with the compressive strength of early-age cylinders. This in turn provides the baseline for future placements and the critical decision making process of when to remove formwork or when to stress post-tension cables by the construction team in a timely manner.
The initial costs in trial batches and correlation testing to develop the maturity curves and the actual maturity monitoring during placement is a minimal and worthwhile investment that can be quickly recovered. The form removal and stressing decision process, the significant construction schedule time savings, as well as reduction in the number of cylinder test specimens required per the project, all result in accelerating the construction of concrete construction projects.

 


Using the maturity meter method for early strength assessment can provide more accurate data in assisting in assessing when:

  • Post-tensioned tendons may be stressed.
  • Concrete formwork may be removed.
  • Shoring and re-shoring operations can begin.
  • Floor slabs and pavements may be opened to traffic.

In addition, maturity meter can also be used to measure:

  • Concrete curing temperatures.
  • Cold-weather temperature effects on the curing process.
  • Temperature differentials in mass-concrete placements.

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Texas Alliance of Energy Producers Oil and Gas Expo (TAEP)

Texas Alliance of Energy Producers Oil and Gas Expo (TAEP)
April 25-26
Wichita Falls, TX

For more information on the conference, click here.