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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Nanomaterials and Industrial Hygiene featured in The Synergist

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  • 4:14PM Nov 22, 2013
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Do you understand how engineered nanomaterial properties differ during production, processing, and disposal? How about the evaluation of potential risks associated with nanoparticle fabrication, handling, machining, or containerizing? When it comes to nanomaterials, it’s hard to see all the risks that workers encounter, literally and hypothetically. A recent article co-authored by Keith Rickabaugh of RJ […]

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New Technique Used for 3D Microstructural Information and Next Generation Materials

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  • 10:00AM Aug 26, 2013
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Results show great promise for the additive manufacturing and materials modeling community. Dr. Chris Hefferan, RJ Lee Group Materials Scientist, will be presenting at Materials Science & Technology (MS&T) 2013 in late October on an up-and-coming characterization technique that has led to a notable scientific result in fundamental research. Dr. Hefferan is one of a […]

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Failure Analysis Determines Faulty Workmanship, Not Defective Building Materials, Caused Damage

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Defining the Challenge Upon completion of a high-rise residential structure, cracks and delamination appeared on exterior surfaces of the tower compelling building owners to initiate a lawsuit against the general contractor. The contractor, in turn, blamed faulty materials used by subcontractors. With so many subcontractors involved in this large construction project, it seemed an almost […]

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Capacitor Testing Provides Data for Possible Patent Infringement

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RJ Lee Group received several de-mounted multi-layer ceramic SMT capacitors for examination. The devices were involved in a possible patent infringement case dealing with device design and the electrical properties of the insulator material. Three of the devices were selected for a survey by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis. The […]

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