首页> 外文会议>International symposium on service life design for infrastructure >EXPERIMENTAL STUDY TO ESTIMATE THERMAL STRESS CAUSED BY HEAT OF CEMENT HYDRATION IN MASSIVE CONCRETE STRUCTURES
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EXPERIMENTAL STUDY TO ESTIMATE THERMAL STRESS CAUSED BY HEAT OF CEMENT HYDRATION IN MASSIVE CONCRETE STRUCTURES

机译:估算大型混凝土结构中水泥水化热引起的热应力的实验研究

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Thermal cracking may occur due to many factors such as size, shape, concrete placement period, material, mix proportion and environmental conditions of the structure being constructed.Therefore, it is necessary to determine various conditions in order to predict thermal cracking caused by heat of hydration of cement. For example, an analytical model should be made on the basis of shape of constructed structure and ground conditions and it is necessary to determine conditions of thermal and mechanical properties for the analysis from used materials and mix proportion. In addition, the boundary conditions shall be determined on the basis of environmental condition of the construction area, types of the mould, time from placement until stripping, and curing method. It becomes possible that thermal stress analysis is carried out by determining these conditions at last. In this report, the convenient test for evaluating thermal and mechanical properties of concrete considering temperature dependency using the thermal insulation container, direct tensile test and the test for estimating the limit to generating of cracking using Thermal Stress Testing Machine (TSTM) were proposed to bring thermal and mechanical properties by which the results in prediction analysis of expansion and shrinkage with temperature change of concrete were affected more close by properties with existing structures.
机译:可能由于多种因素而发生热裂纹,例如尺寸,形状,混凝土浇筑时间,材料,配合比和所构造结构的环境条件等,因此,有必要确定各种条件以预测由热产生的热裂纹。水泥的水化。例如,应根据所构造结构的形状和地面条件来建立分析模型,并且有必要确定所用材料和混合比例的热和机械性能条件以进行分析。此外,边界条件应根据建筑区域的环境条件,模具的类型,从放置到剥离的时间以及固化方法来确定。通过最终确定这些条件,可以进行热应力分析。在本报告中,提出了使用隔热容器评估考虑温度依赖性的混凝土的热力学性能的便捷测试,直接拉伸测试以及使用热应力测试机(TSTM)评估开裂极限的测试,热力学和机械性能,通过预测混凝土的膨胀和收缩随温度变化而得到的结果,受现有结构的性能影响更大。

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