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Showing 1 to 20 of 31 for “"Alkali-Silica Reaction (ASR)"”.
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Mitigation and Evaluation of Alkali-Silica Reaction (ASR) and Freezing and Thawing in Concrete Transportation Structures
<p>An evaluation of alkali-silica reaction (ASR) and freezing and thawing (F/T) in concrete transportation structures is presented along with mitigation methods for slowing the rate of deterioration in concrete. A combination of field and laboratory testing confirms ASR deterioration is exacerbated …
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The Effect of Composition on the Alkali-Silica Mitigation Potential of Fly Ash-Ground Glass Blends in Concrete
… different fly ashes as a mitigation method for alkali-silica reaction (ASR) in concrete. ASR is the reaction between select reactive aggregates and alkalis in the pore solution of concrete added by the hydration of portland cement. The inclusion of fly ash and waste glass has potential to reduce …
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Durability of Silane Sealer in a Highly Alkaline Environment
<p>Alkali-silica reaction (ASR) is a chemical reaction between siliceous minerals present in certain aggregates and alkalis in the concrete pore solution. The reaction can lead to expansion and severe damage in concrete members. One method to mitigate ASR expansion is to use a penetrating sealer …
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Identifying Damage, Predicting Expansion, and Determining the Effectiveness of Sealers on Concrete Affected by Alkali-Silica Reaction and Freeze-Thaw
… Fayetteville, Arkansas due to a combination of Alkali-Silica Reaction (ASR) and freeze-thaw has led to ASR and freeze-thaw research at the University of Arkansas. Potential for further expansion (PFET), Damage Rating Index (DRI), and mitigation of freeze-thaw and ASR with sealers testing and …
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Effects Of Fiber And Lithium On Mechanical Properties Of Concrete Made Fromrecycled Concrete Aggregate
… cracks and increasing residual load capacity. Alkali-Silica Reaction (ASR) is a major problem in concrete, especially when using RCA, causing concrete expansion and cracks. Recently lithium has been found to reduce expansion due to ASR. This thesis will investigate the effect, of fibers soaked …
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Effects of the alkali-silica reaction on unloaded, statically loaded and dynamically loaded reinforced concrete beams.
The Alkali-Silica Reaction (ASR) affects many concrete structures throughout the world. Small scale, simply supported, singly reinforced concrete beams made of both reactive and non-reactive aggregate have been tested. Reactive and non-reactive concrete cylinders, resonant frequency prisms and CSA …
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Using lithium compounds as an admixture in new concrete and as a post-treatment for existing concrete affected by alkali-silica reaction
… to mitigate or prevent deterioration due to alkali-silica reaction (ASR). The first objective of the project is the assessment of the current test methods available for testing the efficacy of lithium nitrate as an admixture. The two test methods used were ASTM C 1260 and ASTM C 1293 and …
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Investigation on the Overall Performance of Recycled Concrete Affected by Alkali-Silica Reaction
… reactive aggregates in many quarries in Canada, alkali-silica reaction (ASR) is one of the most common deterioration mechanisms. The durability and long-term performance of RCA concrete are not fully understood and should be further investigated, especially in regards to a) the potential of …
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Characterization and deterioration detection of portland cement concrete using ultrasonic waves
… detect deterioration induced by freeze/thaw and alkali-silica reaction, and to detect chloride presence in PCC using ultrasonic waves. The experimental program was initiated to investigate the effect of water to cement (w/c) ratio, aggregate type, and air entrainn1ent on measured ultrasonic wave …
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Concrete microstructure homogenization technique with application to model concrete serviceability
… unhydrated cement, calcium hydroxide, calcium silicate hydrate, etc.), which are determined by the validated three-dimensional (3D) cement hydration and microstructural development model HYMOSTRUC® or CEMHYD3D. The developed cement paste RVE at different hydration ages is transferred to a …
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Thermo-chemo-mechanical modelling of hydropower structures affected by alkali silica reaction
Alkali-Silica Reaction (ASR) is a deleterious chemical reaction whose product expands in the presence of water inducing internal pressures within the concrete microstructure resulting in cracking and a reduction in elastic properties of concrete. Thus, ASR can substantially reduce serviceability …
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Digital image correlation analysis of alkali silica reaction in concrete with recycled glass aggregate
… inspires the application in studies of concrete alkali silica reaction (ASR). In this study, a MATLAB DIC code is employed as a strain measurement method to enhance the ASTM C1260 Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method). Recycled glass is used as the …
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Short & long term properties of self-consolidating concrete incorporating fly ash and local aggregate
… freeze-thaw durability, and potential for alkali-silica reaction (ASR). Experimental investigations show that SCC can have similar strength characteristics compared to NVC. Lowering the water to total cementitious materials ratio causes SCC to gain significant strength properties without …
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Mitigating alkali silica reaction in recycled concrete
… recycled concrete aggregate (RCA) that had shown alkali silica reaction (ASR) distress was evaluated. It was found that ASR mitigation was needed to prevent continued expansion. Several mitigation methods were evaluated and compared to conventional concrete using the testing procedures of ASTM C …
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The control of alkali silica reaction using blended cements
It has been previously established that alkali silica reaction (ASR) in concrete may be controlled by blending Portland cement with suitable hydraulic or pozzolanic materials. The controlling mechanism has been attributed to the dilution of the cement's alkali content and reduced mobility of ions …
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Accelerated Alkali-Silica Reaction and Corrosion of Reinforcing Steel in Concrete: Application on Dry Casks
… reinforced concrete structures are corrosion and alkali-silica reaction (ASR). These two processes occur very slowly and to assess them in a short period of time, they need to be accelerated. Furthermore, these mechanisms are dependent on the geometry and boundary conditions of the structure. …
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Effects of Alkali-Silica Reaction on Response of Concrete Squat Shear Walls
Alkali-Aggregate Reaction (AAR) problem is common in structures such as bridges, roadways, airport runways, and nuclear power plants that were built with reactive aggregate. The Alkali-Aggregate Reaction progresses with time in concrete between the alkaline cement paste and reactive amorphous …
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Nouveau système cimentaire cas de la Fritte de verre
… effect of sodium content on the development of alkali-silica reaction (ASR) expansion of concrete. Therefore, this study also aimed to investigate the effect of GF sodium content in the enhancement of ASR expansion and to find new synergistic mixtures that can effectively mitigate ASR expansion …
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Crash Analysis of Degraded Concrete Containment Structures
… creep, heat transfer, moisture diffusion, and Alkali-Silica Reaction (ASR). Long-term creep and shrinkage of vertical dry cask are modeled using the B4 creep formulation for concrete. The results show that creep and shrinkage does not significantly affect the performance of the dry cask …
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Finite element model updating of concrete arch dams affected by alkali-silica reaction using ambient vibration monitoring and dam surveillance data
… impacts associated with their collapse. Alkali-Silica Reaction (ASR) is a deleterious chemical reaction that affects the performance and safety of numerous concrete dam structures around the world. To ensure dam safety, a well-structured dam surveillance program that includes ambient …
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