Measuring Potential Expansion due to Alkali-Silica Reaction in Concrete

研究的总体目标是更好地了解和预测碱-硅酸反应引起的混凝土膨胀。这项工作包括三个主要任务：1)开发一种新的测试方法，类似于ASTM C441，来测量波特兰水泥与碱活性硅质集料结合的潜在反应性；2)开发波特兰水泥与碱活性硅质集料结合的潜在反应性的性能规范，作为目前包括在C150中的碱含量可选规范的替代方案；3)开发一个描述碱-硅酸反应膨胀动力学的模型，旨在提高我们对膨胀控制因素的理解，并改进从短期加速试验中对最终膨胀的估计。

The overall objective of the research is to understand better and to make more predictable the expansion of concrete due to alkali- silica reaction. The work consists of three broad tasks: 1) to develop a new test method, similar to ASTM C441, to measure the potential reactivity of portland cement in combination with alkali- reactive siliceous aggregate; 2) to develop a performance specification for the potential reactivity of portland cement in combination with alkali-reactive siliceous aggregate for proposal as an alterative to optional specification on alkali content currently included in C150; and 3) to develop a model that describes the kinetics of expansion due to alkali-silica reaction, aimed at improving our understanding of the factors that control expansion and at improving the estimation of ultimate expansion from short-term, accelerated tests.