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对3组普通加气混凝土砌块试件和2组玻璃纤维加气混凝土砌块试件进行双面剪切试验,研究砌块强度等级、纤维体积率对加气混凝土砌块抗剪性能的影响;依据扫描电镜(SEM)结果,分析纤维对其抗剪性能的影响机理。试验结果表明:随着砌块强度等级提高其抗剪强度逐渐增大,B06级砌块的变形、抗剪强度比B05级分别提高14.3%、28.1%,B07级砌块的变形、抗剪强度比B06级分别提高18.5%、29.2%;纤维体积率2.5%的B06级蒸压加气混凝土砌块比不掺纤维B06级砌块的平均极限变形、初裂抗剪强度、极限抗剪强度分别提高10.5%、2.4%、4.9%,纤维体积率5%的B06级蒸压加气混凝土砌块比不掺纤维B06级砌块的平均极限变形、初裂抗剪强度、极限抗剪强度提高19.5%、7.3%、12.2%;玻璃纤维与水化产物形成的网络状三维支撑体系是增强其抗剪性能及变形的主要原因。
Three groups of ordinary aerated concrete block specimens and two groups of glass fiber aerated concrete block specimens were subjected to double-sided shear test to study the influence of block strength grade and fiber volume fraction on shear resistance of aerated concrete block According to the results of scanning electron microscopy (SEM), the influence mechanism of fiber on its shear resistance was analyzed. The experimental results show that the deformation and shear strength of B06 block increase by 14.3% and 28.1% respectively compared with B05 grade as the block strength increases. The deformation and shear strength of B07 block, Which is 18.5% and 29.2% higher than that of B06 respectively. The average ultimate deformation, primary shear strength and ultimate shear strength of B06 autoclaved aerated concrete block with fiber volume fraction of 2.5% The average ultimate deformation of B06 autoclaved aerated concrete blocks increased by 10.5%, 2.4%, 4.9% and 5% of the volume fraction of fibers, the initial shear strength and the ultimate shear strength increased by 19.5 %, 7.3% and 12.2% respectively. The network-shaped three-dimensional support system formed by glass fiber and hydration products is the main reason for enhancing the shear resistance and deformation.