aggregate testing laboratory, concrete aggregate testing, astm tests

aggregate testing laboratory, concrete aggregate testing, astm tests

Our employees are active members in ACI, ASTM, ICRI, FRCA, ASCE and SWRI. Several TEC Services employees are current or past committee members, committee chairs, board members and presidents of these organizations in local and national chapters.

Our Aggregate Laboratory performs a wide range of the testing on aggregates.Some of the testing we perform is referenced below. This list consists of ASTM tests that we perform on a regular basis. If a test is desired that is not listed below, please call and inquire for further details.

Admixture Testing Aggregate Laboratory Anchor Systems Testing Cement Laboratory Concrete Laboratory Concrete Petrography Laboratory Epoxy, Sealants, & Coatings Fiber-Reinforced Concrete Masonry Testing Metals Testing Pozzolanic & Mineral Admixture Laboratory Products Testing Repair Products & Mortars Testing Tree Stand & Fall Arrest Harness Testing

concrete testing, asphalt testing, aggregate testing, astm standards, hot mix testing, field testing services

concrete testing, asphalt testing, aggregate testing, astm standards, hot mix testing, field testing services

Concrete, Aggregate and Asphalt Testing (CA2 Testing) was built to assist contractors and suppliers in providing the highest quality concrete and asphaltic concrete designs for construction projects in and around New Mexico. In addition we provide specialized testing, field testing, lab equipment calibration, and repair.

We strive to maintain a personal relationship with our customers through the various communication avenues available including mobile, email, fax, text and in house land line methods. We always welcome clients to visit our facility in person. Our test results are delivered electronically or over the phone to limit the wait time. In addition we seek feedback from our clients regularly to ensure our field testing personnel meet or exceed expectations. We perform in house quality control to certify that all test procedures and test methods are performed in accordance with the guidelines stipulated by the governing agencies and in a safe, efficient and accurate manner.

Time is valuable. In recognition of this principal we endeavor through careful planning and maintaining properly trained staff in house to prevent or limit back log. Often we can begin testing the day material arrives in our facility. We are happy to work with clients to sample and/or arrange a convenient and efficient method of delivery.

We endeavor at all times to provide our clients with convenient, efficient, and reliable services. From the moment we speak with you till the job is complete we strive to ensure client satisfaction. If at any time our clients need clarification of a test method, test procedure, or how to interpret the results, we are a phone call away. When in the field, our techs will be happy to assist in providing guidance on achieving the required standard. Our job is to make your job easier, and we take our job very seriously.

concrete aggregates | testing standard | wje

concrete aggregates | testing standard | wje

With a team of industry-leading engineers and scientists, WJE's Janney Technical Centeralong with laboratories in Austin and Clevelandprovides advanced testing and forensic capabilities to solve the most technically challenging problems related to structures, construction materials, and manufactured components.

Extraordinary people continue to be the foundation of our success. Our engineers, architects, and materials scientists have expertise in developing solutions for all aspects of new and existing structures.

Our team has investigated, tested, and repaired more than 125,000 projects involving almost every type of construction material, structural system, and architectural component. Weve extended the life of countless structures, improved the construction industry's understanding of why structures fail, and formulated numerous ways in which they can be preserved.

Building on more than sixty-five years of finding innovative solutions to construction-related problems, WJE recognizes the value of knowledge sharing and collaboration, not just among our employees but with our industry colleaguesas well.

WJE regularly hosts webinars on interesting topics and challenges related to the built world. We encourage you to search through our library for subjects of interest to you. Watch, listen, and share with others.

WJE encourages its engineers, architects, and materials scientists to contribute to the ongoing dialogue of the built world through the sharing of presentations at conferences, seminars, and other educational forums. Please check back on a regular basis to see where a WJE expert will be speaking next.

WJE has developed informational websites containing general information regarding specific facade and seismic ordinances in various cities throughout the United States and California, respectively. These websites are intended for use by individuals seeking an introduction to facade and seismic ordinances.

WJE offers a career alongside the best and brightest in our industry. We work on fascinating projects. Clients worldwide seek our expertise to solve the most significant, interesting, and challenging problems of the built world. Whether you bring years of experience to the team or you're just starting your career, WJE is a great choice.

With global capabilities, WJE can respond quickly to assignments around the world. WJE's Northbrook, Illinois, campus includes our headquarters and one of the most advanced facilities anywhere for construction-related investigations, instrumentation, and research.

Wiss, Janney, Elstner Associates is committed to helping our clients solve, repair, and avoid problems in the built world. Supported by unparalleled laboratory and field testing capabilities, our team of engineers, architects, and materials scientists brings an enthusiasm for problem solving and a hands-on technical approach to every challenge.

Ask the Structure and Solutions for the Built World are trademarks of Wiss, Janney, Elstner Associates, Inc. COPYRIGHT WISS, JANNEY, ELSTNER ASSOCIATES, INC., NORTHBROOK, ILLINOIS. ALL RIGHTS RESERVED.

concrete and aggregate testing: an astm how-to guide - gilson co

concrete and aggregate testing: an astm how-to guide - gilson co

Producing meaningful concrete and aggregate test results rely heavily on following strict procedures in test methods and practices published by ASTM, AASHTO, and other organizations. Requirements for tests on aggregates, concrete compressive strength tests, and other methods are written in clear, concise language following form, content, and style guidelines, but often lack basic explanatory information and guidance for actually getting the job done. Technicians can sometimes be left wondering how to complete the test while complying with the requirements.

Its an open secret that one of the most valuable references available for construction materials testing labs has long been included with every copy ofASTM Volume 4.02, Concrete, and Aggregates testing. Tucked away in the back of printed editions and included with digital versions, theManual of Aggregate and Concrete Testing is known informally as the gray pages from the shaded edging of the printed pages for easy location. This practical supplement is the how and why of the test methods and a guide to performing concrete and aggregate tests efficiently while conforming to the requirements. The manual has the number designation R0030 and is not an ASTM standard, nor is it written in the mandatory language style used in standard practice and test method documents. It aims to direct attention to factors that could affect the results of the concrete and tests.

The most helpful aspect of the manual is that it often simply restates requirements of the standards in plain, simple language. The focus is to help the user perform the tests successfully and in full compliance with the published standards. Reinforcing proper procedures and making them easier to understand encourages greater compliance, reduces operator error, and promotes accurate and repeatable test results.

The idea that wisdom is knowledge shaped by practical experience goes to the heart of the gray pages. The manual is written, maintained, and edited by ASTM members of Subcommittee C09.97 with wide and deep real-world backgrounds in concrete and aggregate testing. Input for topical content and information for discussion is welcomed from all industry sources. The subcommittee meets twice a year and content is created, reviewed, and curated to ensure compliance with published standards while offering pragmatic solutions to performing the tests.

The opening chapters of the manual emphasize the importance of keeping current versions of relevant standards on hand and suggestions with references for the qualification of laboratory personnel. Additional sections on the selection and maintenance of equipment, laboratory inspection, audits, and lab safety offer sound direction in the day-to-day operations of a successful construction materials testing laboratory. The bulk of the publication is devoted to chapters focusing on individual test methods.

Gilson staff are active participants on ASTM Committees C09 Concrete, D04 Asphalt, D18 Soils, and E29 Particle Characterization. The author has been an active member of C09.97 and other subcommittees for over 20 years.

concrete air testing: an in-depth look - gilson co

concrete air testing: an in-depth look - gilson co

The primary purpose of entraining air in concrete is to increase its durability when exposed to freeze/thaw cycles with water present. Air-entraining admixtures for concrete create small, uniform, and stable air bubbles from around 0.01mm to 1mm diameter in the cement matrix throughout a concrete mix. The bubbles become air voids in the hardened concrete, creating a relief system that allows expansion of water as it freezes without damaging the concrete.

Even though concrete not exposed to freeze/thaw cycles may not require air-entraining admixtures, testing for air content is still recommended to profile characteristics of the particular concrete batch. Most non-air-entrained concrete contains between 1% and 2% entrapped air, and other admixtures may unintentionally entrain even more air. ACI 301-16 Specifications for Structural Concrete and ACI 302.1R-15 Guide to Concrete Floor and Slab Construction indicate that air contents higher than 3% may require extra effort when finishing some mixes, leading to surface defects and delamination. Air content tests on non-air-entrained fresh concrete can prevent issues before they occur or be a valuable troubleshooting tool. One of Gilsons previous blog posts Why Complete Testing of Fresh Concrete Matters discusses the importance of complete testing of fresh concrete.

Just as putting air-entraining admixtures into concrete creates beneficial air bubbles, mixing, transporting, pumping, and handling the mix can take them out. So, not only is air content testing essential but so is testing at the right time and place. If the testing agency were only confirming the properties of the concrete as delivered to the job site, an argument could be made for testing only concrete sampled directly from the delivery truck. In truth, most stakeholders in a project are better served with more complete information, and it is often specified that the concrete is sampled at the point of placement, such as at the discharge end of a concrete pump. This can create difficulties in accurately sampling and testing fresh concrete and requires planning by the testing agency and cooperation with other trades.

Type A and Type B concrete air meters use different techniques to apply air pressure to a concrete specimen and compress the air voids in the sample. Differences in volume before and after compression indicate apparent air content, which is corrected to exclude air voids in aggregate particles. The pressure method cannot be used on mixes containing lightweight aggregates, blast furnace slag, or other aggregates with high porosity. Detailed test procedures for both types of meters are detailed in ASTMC231 and AASHTO T 152. Both meters use similar methods to consolidate fresh concrete into the measuring bowl, or pot. Concrete is deposited in three equal layers, and each layer is rodded 25 times with a tamping rod. The concrete gets struck off with a strike-off bar or plate, so the volume in a given bowl is the same each time.

Type A meters are fitted with a sealed graduated cylinder in the cover. After the sample is consolidated, the cover is clamped into place and filled with water. A specified pressure is applied to the assembly using an external pump or squeeze bulb, compressing the air voids in the specimen and lowering the water level. After releasing the pressure, the water level in the cylinder rises. The difference between the two levels is read from the cylinder graduations to determine the air content.

Type B concrete air metersincorporate an air chamber in the cover that is pressurized with an integral pump to a predetermined initial pressure once the cover is placed on the pot. A small amount of water is added to the assembled unit to displace free air, and the petcocks are closed. The pressurized air is released into the lower chamber and compresses the concrete specimen. Thecalibrated gauge displays the pressure difference directly as the total percent air content.

Super Air Meter(SAM) is a modified Type B concrete air meter invented by Tyler Ley, Ph.D., PE, who promises the SAM will change the way we view concretes freeze-thaw durability. (To read more about Tyler, see ourTyler Ley Interview blog post with Dr. Ley himself).

The SAM uses an extended test procedure to determine air content and characterize the size and distribution of air bubbles in the concrete mix. The SAM and test method are an important step forward to increase freeze/thaw durability prediction in exposed concrete. It gets used in several U.S. states and foreign countries. The first part of this method meets all the requirements of ASTM C231. The SAM can be used in place of the standard Type B meter for this application. After completion of the air content test, additional increments of pressure are applied in two sequences. Pressure differences are recorded and used to correlate average air void spacing. The complete SAM method is detailed in AASHTO TP 118, and an ASTM method is pending.

Volumetric air content tests start with a concrete specimen of known volume consolidated into a container. A cover with integral graduated markings is sealed on the top and filled to a zero point with either water, isopropyl alcohol, or both. The entire assembly is then agitated vigorously, and the air voids are effectively washed out of the specimen. The difference in fluid levels before and after agitation is recorded as the air content.

Roller meters are usually constructed of aluminum(Roll-A-Meter), plastic(Volumetair Air Meter), or brass with a measuring bowl of at least 0.075ft (2.0L). The top section clamps to the bowl and includes a transparent graduated scale. Concrete is consolidated into the bowl, and the top section clamped in place. The assembly is then filled with combinations of water and measured amounts of isopropyl alcohol, as detailed in ASTMC173 and AASHTO T 196. Some concrete mixes produce large amounts of foam after agitation, and the alcohol disperses the foam to allow more accurate fluid level readings.

Chace Air Indicator Kitis a bit like a miniature roller meter, but the size of the specimen limits them to testing just the mortar portion of concrete mixes. There is no published standard for the kits. However, they are still useful for gauging the uniformity of fresh concrete during a pour when correlated to a conventional concrete air meter. A brass cup mounted on a rubber stopper is filled with mortar. A glass vial with a graduated neck is pushed onto the stopper and filled to zero with isopropyl alcohol. The assembly is then agitated, and the difference in fluid level noted before and after agitation is observed for correlation with standard air meters.

The gravimetric method for calculating air content is part of a procedure in ASTM C138. AASHTOT 121 also determines unit weights and yield of a concrete batch. Equipment for performing this test includes unit weight measures, strike-off plates, tamping rods, and field weighing scales. Fresh concrete consolidates into a unit weight measure, then carefully struck off and weighed. From there, a series of calculations are performed using the specimen weight and actual batch weights of the mix to determine the unit weight, density, yield, air content, cement content, and other properties of the mix.

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