全轻与半轻混凝土单向与双向板的静载试验研究

发布时间：2018-06-05 18:55

本文选题：全轻混凝土 + 半轻混凝土　；参考：《河南理工大学》2016年硕士论文

【摘要】：普通混凝土自重大、保温隔热性能差等缺陷是影响建筑物向超高层、超大跨度方向及装配式建筑发展的制约因素,而轻骨料混凝土因其轻质高强、抗震、防火、保温隔热等优良特性则正好是一种有益的补充。但由于轻集料混凝土在结构研究方面相对较少,其许多物理力学性能还不太清楚,因此导致理论研究滞后于工程需求。本文主要针对轻骨料混凝土中的全轻混凝土、砂轻混凝土、石轻混凝土和混轻混凝土,根据课题组的前期相关研究成果,首先进行了配合比验证;然后分别制作了12块单向板和5块双向板;通过单调静载试验和结果分析可知,两种板均满足《轻骨料混凝土结构技术规程》(JGJ12-2006)要求。具体研究内容及结论如下:(1)通过对全轻混凝土、砂轻混凝土、石轻混凝土和混轻混凝土的立方体抗压强度、轴心抗压强度和干表观密度等参数的验证试验,证明了课题组前期相关配合比的稳定可靠性;(2)制作了12块单向板,其中,混凝土强度等级分别为LC30、LC35、LC40各4块,且同一强度等级时,全轻混凝土、砂轻混凝土、石轻混凝土、混轻混凝土各1块。通过单调静力加载试验,分别分析了不同强度等级、不同骨料掺量等因素对单向板的正截面承载力、破坏形态、挠度等影响,并与普通混凝土、再生混凝土进行进行了对比分析。结果表明,各种混凝土单向板的破坏形态基本相似,且其裂缝宽度以及跨中挠度都能够满足JGJ12-2006要求;(3)制作了5块双向板,其中,强度等级为LC30时,全轻混凝土、砂轻混凝土、石轻混凝土、混轻混凝土各1块;LC40时全轻混凝土1块。通过单调静力加载试验,分别分析了不同强度等级、不同骨料掺量等对双向板的正截面承载力、破坏形态、裂缝分布等影响,并与普通混凝土、再生混凝土进行进行了对比分析。结果表明,其裂缝分布形状以及破坏形态基本相似,且均能够满足JGJ12-2006要求。
[Abstract]:The defects of the ordinary concrete, the poor thermal insulation performance and so on are the restrictive factors that influence the development of the building to the super high rise, the super large span direction and the assembly building, and the light aggregate concrete is a beneficial supplement because of its light weight, high strength, earthquake resistance, fire protection, thermal insulation and so on. A lot of physical and mechanical properties are not very clear, so the theoretical research is lagging behind the demand of engineering. This paper mainly aims at the light concrete, sand light concrete, stone lightweight concrete and mixed light concrete in light aggregate concrete. 12 unidirectional plates and 5 bi-directional plates were made respectively. Through the monotonic static load test and the result analysis, it was found that the two kinds of plates met the requirements of the technical specification for the lightweight aggregate concrete structure (JGJ12-2006). The specific contents and conclusions were as follows: (1) the cube compression strength of all light concrete, sand light concrete, stone lightweight concrete and mixed light concrete was strong. The test of degree, axial compression strength and dry apparent density proved the stability and reliability of the earlier correlation ratio of the project group; (2) 12 unidirectional plates were made, of which the concrete strength grade was LC30, LC35, LC40, respectively 4, and all light concrete, sand light concrete, stone lightweight concrete and lightweight concrete at the same strength grade. Each 1 blocks. Through the monotone static loading test, the effects of different strength grade and different aggregate amount on the normal section bearing capacity, failure form and deflection of the unidirectional plate are analyzed, and the results are compared with the ordinary concrete and recycled concrete. The results show that the failure forms of the concrete unidirectional plates are basically similar, and they are basically similar. The width of the crack and the mid span deflection can meet the JGJ12-2006 requirements; (3) 5 bi-directional plates are made, in which the strength grade is LC30, all light concrete, sand light concrete, stone light concrete, and mixed light concrete are 1, and 1 of all light concrete at LC40. By monotonic static loading test, the different strength grades and different aggregate content are analyzed. The effect of the bearing capacity of the cross section, the damage form and the distribution of the cracks, and so on, is compared with the ordinary concrete and recycled concrete. The results show that the shape of the crack distribution and the damage form are basically similar, and all can meet the requirements of JGJ12-2006.
【学位授予单位】：河南理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU528

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