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首页> 外文会议>Airfield and Highway Pavement Specialty Conference; 20060430-0503; Atlanta,GA(US) >Evaluation of Alkali-Silica Reaction Potential of Aggregate Using Dilatometer Method
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Evaluation of Alkali-Silica Reaction Potential of Aggregate Using Dilatometer Method

机译：膨胀计法评价骨料的碱硅反应活性

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摘要

Existing test methodology for alkali silica reactivity (ASR) are applicable to only a narrow band of accelerated conditions and doubts remain whether these methods have any relevance to concrete performance under field conditions. Aggregate reactivity is a key factor in predicting the concrete ASR and is a function of alkalinity, temperature, size and crystallinity. Recently developed at the Texas Transportation Institute, Texas A&M University, a testing apparatus called a dilatometer has been used to measure aggregate ASR expansion and introducing activation energy as a single parameter to represent aggregate ASR reactivity. The expansion-time characteristics as a function of temperature can be expressed by the term activation energy (Ea). The rationality of the dilatometer test procedure is explored by conducting comprehensive laboratory experiments related to the effects of test solution (NaOH) alkalinity, temperature and Ca~(2+) contents on E_a. Dilatometer measures the volumetric expansion due to ASR and accounts the direct measurement of expansion produced by the reaction products. Based on the test results, it is observed that this test method will be useful to evaluate ASR potential of aggregates based on their E_a within a very short period of time (e.g., within 3 days). The dependency of Ea on alkalinity, Ca~(2+) content and aggregate size provides a means to evaluate ASR potential of concrete relative to levels of alkali and temperature that occur under field conditions.
机译：现有的碱性二氧化硅反应性（ASR）测试方法仅适用于狭窄的加速条件带，并且怀疑这些方法是否与现场条件下的混凝土性能有关。骨料反应性是预测混凝土ASR的关键因素，并且是碱度，温度，尺寸和结晶度的函数。最近在得克萨斯州A＆M大学的得克萨斯州运输学院开发的一种称为膨胀计的测试设备已用于测量聚合ASR的膨胀，并引入活化能作为代表聚合ASR反应性的单个参数。随时间变化的膨胀时间特性可以用活化能（Ea）来表示。通过进行与测试溶液（NaOH）碱度，温度和Ca〜（2+）含量对E_a的影响有关的综合实验室实验，探索了膨胀计测试程序的合理性。膨胀计测量由于ASR引起的体积膨胀，并直接测量反应产物产生的膨胀。根据测试结果，观察到该测试方法将对在非常短的时间段内（例如3天内）基于聚集体的E_a评估聚集体的ASR潜力很有用。 Ea对碱度，Ca〜（2+）含量和骨料尺寸的依赖性为评估混凝土在田间条件下相对于碱和温度的ASR潜力提供了一种手段。

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