Study on notch sensitivity of fracture properties of concrete containing Nano-SiO 2 particles and fly ash
Study on notch sensitivity of fracture properties of concrete containing Nano-SiO 2 particles and fly ash
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DOI：
10.1155/2013/381682
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发表时间：
2013
影响因子：
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通讯作者：
Peng Zhang;Q. Guan;L. Chenhui;Qing-fu Li
中科院分区：
文献类型：
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作者：
Peng Zhang;Q. Guan;L. Chenhui;Qing-fu Li
采用三点弯曲法测定了不同相对缺口深度的纳米SiO2和粉煤灰混凝土缺口梁试件的断裂参数和断裂关系曲线。结果表明：缺口试件的相对缺口深度对纳米SiO2和粉煤灰混凝土的ac、KICini、KICun、GF、CMODc以及断裂关系曲线有很大的影响。随着相对缺口深度的增加，缺口梁的ac和CMODc有增大的趋势，而KICini、KICun和GF则逐渐减小。此外，当相对缺口深度从0.2增加到0.5时，曲线的非线性阶段变得越来越短，曲线的下降阶段变得越来越尖锐。含纳米SiO2和粉煤灰的混凝土的断裂参数ac、KICini、KICun、GF和CMODc以及断裂曲线对相对缺口深度敏感，而CTODc对相对缺口深度可能不敏感。
The fracture parameters and fracture relational curves of the concrete containing nano-SiO2 and fly ash with different relative notch depth of the notched beamspecimens were measured by means of three-point bending method. The results indicate that the relative notch depth of the notched specimens has great effect on ac, KICini, KICun, GF, CMODc, and the fracture relational curves of the concrete containing nano-SiO2 and fly ash. There is a tendency of increase in ac and CMODc with the increase of relative notch depth, while KICini, KICun, and GF are decreasing graduallywith the increase of relative notch depth of the notched beam specimens. Besides, when the relative notch depth increases from 0.2 to 0.5, the nonlinear stage of the curve becomes shorter and shorter, and the descent stage of the curve becomes sharper and sharper. The fracture parameters of ac,KICini,KICun, GF and CMODc and the fracture curves are sensitive to the relative notch depth, while CTODc may be not sensitive to the relative notch depth of the specimens of the concrete containing nano-SiO2 and fly ash.