蒸压加气混凝土自保温砌块砌体基本力学性能试验研究

发布时间：2018-08-20 10:24

【摘要】：蒸压加气混凝土自保温砌块作为一种新型材料之所以被普遍应用于建材行业,是因其保温性好、高强度、重量轻、环保节能等特点。作为一种绿色新型墙材,如何将其更好地用于建筑结构承重体系中已成为未来的研究方向。本文对蒸压加气混凝土砌体的抗压性能和抗剪性能探讨分析的同时也分析了砌块的物理力学性能,这对蒸压加气混凝土进一步改善规范提供了理论依据。本文对蒸压加气混凝土砌块的强度、干密度、含水率、吸水率和立方体砌块与棱柱体砌块的尺寸效应进行了研究与分析。结果表明:砌块的强度为4.1MPa,强度较普通混凝土低,干密度为558kg/m~3,含水率为1.3%,吸水率为63.5%,立方体砌块尺寸效应不明显,而弹性模量随着棱柱体砌块尺寸的增大而减小。在蒸压加气混凝土砌体抗压强度试验的基础上,探讨了砌体抗压强度的影响因素。结果表明:蒸压加气混凝土砌体的抗压强度与砂浆强度、砌块强度、灰缝厚度有关,同时画出对应的应力-应变曲线,得出弹性模量及泊松比数值,回归出了砌体抗压强度计算公式,计算结果与试验值吻合良好。本文还对蒸压加气混凝土砌体抗剪强度进行了试验研究与分析。结果表明:蒸压加气混凝土砌体的抗剪强度与灰缝厚度、砂浆强度、养护时间、剪切面积有关,薄灰缝砌体的抗剪强度小于厚灰缝砌体的抗剪强度,同时还回归出了砌体抗剪强度计算公式。
[Abstract]:As a new type of material, autoclaved aerated concrete self-insulating block is widely used in building materials industry because of its good temperature preservation, high strength, light weight, environmental protection and energy saving. As a new green wall material, how to better use it in the load-bearing system of building structure has become the research direction in the future. In this paper, the compressive and shear properties of autoclaved aerated concrete masonry are discussed and analyzed, and the physical and mechanical properties of the block are also analyzed, which provides a theoretical basis for the further improvement of autoclaved aerated concrete. In this paper, the strength, dry density, moisture content, water absorption and the size effect of cubic block and prism block of autoclaved aerated concrete block are studied and analyzed. The results show that the strength of the block is 4.1 MPA, the strength is lower than ordinary concrete, the dry density is 558 kg / m ~ (-3), the water content is 1.3%, the water absorption is 63.5%, the size effect of the cube block is not obvious, but the elastic modulus decreases with the increase of the size of the prismatic block. Based on the compression strength test of autoclaved aerated concrete masonry, the influence factors of masonry compressive strength are discussed. The results show that the compressive strength of autoclaved aerated concrete masonry is related to mortar strength, block strength and ash joint thickness. The corresponding stress-strain curves are drawn, and the elastic modulus and Poisson's ratio are obtained. The formula for calculating the compressive strength of masonry is regressed, and the calculated results are in good agreement with the experimental values. The shear strength of autoclaved aerated concrete masonry is studied and analyzed. The results show that the shear strength of autoclaved aerated concrete masonry is related to the thickness of ash joint, mortar strength, curing time and shear area, and the shear strength of thin ash joint masonry is smaller than that of thick ash joint masonry. At the same time, the formula of shear strength of masonry is regressed.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU522.3

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