冻融环境下煤矸石混凝土损伤演化规律研究

发布时间：2018-08-07 14:10

【摘要】：为研究煤矸石混凝土的抗冻性能,试验按照0%、20%、40%、60%的煤矸石取代率制备混凝土,探索研究不同取代率的煤矸石混凝土在冻融环境下的表观形貌、质量、相对动弹性模量和抗压强度的变化规律;并根据煤矸石混凝土在不同冻融循环作用下的动弹性模量的变化,建立煤矸石混凝土的损伤演化方程.研究结果表明:煤矸石取代率为0%、20%、40%和60%的混凝土,分别在冻融循环300次、65次、55次和25次破坏.随着煤矸石取代率的增加,混凝土的抗冻性能明显降低;煤矸石混凝土的损伤演化方程与试验数据符合较好,可以为冻融环境下煤矸石混凝土的耐久性设计提供理论依据.
[Abstract]:In order to study the frost resistance of coal gangue concrete, the concrete was prepared according to the 60% replacement rate of coal gangue, and the apparent morphology and quality of coal gangue concrete with different replacement rate were studied in freezing and thawing environment. According to the change of dynamic elastic modulus and compressive strength of coal gangue concrete under different freeze-thaw cycles, the damage evolution equation of coal gangue concrete is established. The results show that the concrete of 40% and 60% of coal gangue is destroyed at 300 times, 65 times, and 25 times, respectively. With the increase of coal gangue replacement ratio, the frost resistance of concrete decreases obviously, and the damage evolution equation of coal gangue concrete agrees well with the experimental data, which can provide theoretical basis for durability design of coal gangue concrete in freeze-thaw environment.
【作者单位】：西安科技大学建筑与土木工程学院;
【基金】：陕西省教育厅自然科学基金专项(2013JK0969)
【分类号】：TU528

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