基于Arrhenius方程预测既有构件混凝土材料的潜在AAR安全性

发布时间：2018-02-17 08:12

本文关键词： 既有混凝土碱集料反应(AAR) Arrhenius方程寿命预测　出处：《混凝土》2016年11期 　论文类型：期刊论文

【摘要】：针对具有潜在碱集料反应(AAR)影响的既有构件混凝土,探索了基于Arrhenius方程描述的反应动力学原理快速预测其AAR安全性的方法。以碱含量分别为2.99、3.89 kg/m~3两组混凝土为对象,综合混凝土材料组成与孔溶液碱度、芯样试体实验室快速膨胀数据拟合和Arrhenius模型寿命计算,结果表明:养护温度和养护液碱度对混凝土试体的膨胀具有明显的促进作用;根据高温、高碱条件下快速膨胀试验和拟合结果,可以获取混凝土在实际孔溶液碱度和常温条件下的膨胀速率常数和预期服役寿命;碱含量分别为2.99、3.89 kg/m~3的两组混凝土,其AAR风险预测结果有显著差别。建立混凝土AAR性能快速试验方法和优化基于AAR反应动力学的寿命预测模型是发展基于性能的混凝土AAR耐久性设计和评估的发展方向。
[Abstract]:Based on the reaction kinetics principle described by Arrhenius equation, the method of rapid prediction of AAR safety of existing member concrete with potential alkali aggregate reaction effect is explored. Two groups of concrete with alkali content of 2.9 kg/m~3 3.89 kg/m~3 are taken as objects. The composition of concrete material and alkalinity of pore solution, the fitting of laboratory rapid expansion data of core specimen and the life calculation of Arrhenius model show that curing temperature and curing liquid alkalinity can obviously promote the expansion of concrete specimen. According to the results of rapid expansion test and fitting under high temperature and high alkali condition, the expansion rate constant and expected service life of concrete under the conditions of actual pore solution alkalinity and normal temperature can be obtained, and two groups of concrete with alkali content of 2.99 ~ 3.89 kg/m~3 can be obtained. The rapid test method of concrete AAR performance and the optimization of life prediction model based on AAR reaction dynamics are the development direction of concrete AAR durability design and evaluation based on performance.
【作者单位】：南京工业大学材料科学与工程学院;
【基金】：国家自然科学基金项目(51472116)
【分类号】：TU528

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