Concrete Publication By RJLG Expert Dr. Eric Giannini

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Dr. Eric R. Giannini, RJ Lee Group’s expert in test method development, and nondestructive testing, has co-authored a new publication in Elsevier: Construction & Building Materials. The article is titled “Characterization of Concrete Affected by Delayed Ettringite Formation Using the Stiffness Damage Test.” In this publication, Dr. Giannini and his colleagues apply the stiffness damage test […]

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Petrography is an important part of bridge construction

What Can Petrographic Analysis Tell You About the Condition of Concrete Structures?

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  • 3:59PM Dec 09, 2014
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According to a 2013 Report Card for America’s Infrastructure, 1 in 9 bridges in metropolitan areas are structurally deficient. The estimated investment needed to eliminate the backlog of deficient bridges by 2028 is $20.5 billion annually—that’s $8 billion more per year than currently invested. Recently, CBS addressed the topic of crumbling roads and bridges in […]

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ACR Concrete Controversy Continues – Investigation Indicates that ASR is to Blame

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  • 6:35PM Dec 04, 2013
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Query: Can the main mechanism of concrete distress and cracking in a concrete made with ACR-susceptible aggregates be caused by ASR?? Fact: Alkali Carbonate Reaction (ACR) results when brucite, formed in concrete made with dolomitic (ACR-susceptible) aggregate, crystallizes and expands. Fact: Alkali Silica Reaction (ASR) occurs over time when the alkalis in cement react with […]

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Webinar: Material Challenges in Maintaining Aging Infrastructure – Reinforced Concrete Structures

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  • 12:03PM Nov 20, 2013
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According to the 2013 Report Card published by the American Society of Civil Engineers (ASCE), one in nine bridges in the United States is structurally deficient. Tight budgets require efficiencies when selecting work to be done and so priority is often given to those tasks that will make these structures last as long as possible. […]

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Concrete Failure Analysis Reveals Multiple Causes

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Concrete Failure Analysis Reveals Multiple Causes Swimming pool owners noticed that their concrete pool, which had been repaired two years earlier, was once again leaking and cracks were reappearing. Findings of the original investigation concluded that a chemical reaction was responsible for the leaks and cracks but that the reaction had mitigated when the pool […]

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Analyses Reveal Viaduct Concrete Failure Not Consistent

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An east coast government agency was concerned about the structural integrity of a viaduct on a main north-south highway that handled approximately 75,000 vehicles a day. The structure, which consisted of a 42-foot wide concrete deck of 40 spans and piers, was built in 1953 and was exhibiting signs of general degradation. The agency had […]

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Flawed Freeze-Thaw Testing Standards Unreliable for Predicting Concrete Tie Failures

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  • 2:21PM Jul 30, 2012
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The scientific world has achieved remarkable discoveries and innovations responsible for the modern technology we rely on today. Despite our scientific sophistication, the ability to manipulate time—speed it up, slow it down, reverse it—remains largely a figment of our collective imagination, or a plot vehicle in a science fiction novel. This is not a ground-breaking […]

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April Snyder Featured in Modern Counsel’s Empowering Women Issue

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April Snyder, Construction Materials Laboratory Manager & Senior Concrete Petrographer at RJ Lee Group, is featured in October’s Empowering Women issue of Modern Counsel magazine. Performing petrographic analysis with the company since 1997, Ms. Snyder is a well-known subject matter expert in concrete circles, and was the first female to be elected president of an […]

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