Effect of fly ash and slag on properties of normal and high strength concrete including fracture energy by wedge splitting test: Experimental and numerical investigations
Effect of fly ash and slag on properties of normal and high strength concrete including fracture energy by wedge splitting test: Experimental and numerical investigations
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DOI：
10.1016/j.conbuildmat.2020.121553
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发表时间：
2021-01-12
影响因子：
7.4
通讯作者：
Sanjayan, Jay
中科院分区：
文献类型：
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作者：
Al-Yousuf, Ayad;Pokharel, Tilak;Sanjayan, Jay
从18h开始，研究了不同龄期的辅助胶凝材料(粉煤灰和矿渣)对混凝土性能的影响。这些测试涵盖了不同数量的辅助胶凝材料(SCM)的混凝土配合比。研究了SCM对混凝土抗压强度、劈裂抗拉强度、弹性模量、泊松比和断裂能等性能的影响。通过楔入劈裂试验(WST)评价了不同掺量的粉煤灰和矿渣混凝土的断裂能等性能。矿渣掺量为50%时，混凝土的抗压强度、劈裂抗拉强度、弹性模量和断裂能均比掺25%矿渣时有所下降。掺入25%矿渣的混凝土断裂能也高于掺50%矿渣的混凝土。与纯水泥相比，各龄期掺加FA和矿渣后，断裂能均有所降低。建立了有限元模型，并将有限元分析结果与实验结果进行了比较。断裂能、劈裂载荷与裂口张开位移之间有很好的一致性。(C)2020爱思唯尔有限公司。保留所有权利。
The effect of supplementary cementitious material (fly ash and slag) on the properties of concrete was investigated at different ages starting from as early as 18 h in this paper. The tests covered concrete mix with a different amount of supplementary cementitious material (SCM). The effect of SCM on the properties of concrete (compressive strength, splitting tensile strength, modulus of elasticity, Poisson's ratio and fracture energy) was investigated. Properties of concrete including fracture energy of concrete by wedge splitting test (WST) with different percentage of fly ash (FA) and slag were evaluated. For a mix with 50% slag, there was a decline in the values of compressive strength of concrete, splitting tensile strength, modulus of elasticity and fracture energy compared with a mix with 25% FA. The mix with 25% FA also had a higher fracture energy of concrete than the mix with 50% slag. The fracture energy decreased when FA and slag were added at all ages compared to the pure cement mix. A finite element (FE) model was developed and the results from the FE analysis were compared with the experimental work. A good agreement was achieved in terms of fracture energy and splitting load vs crack mouth opening displacement. (C) 2020 Elsevier Ltd. All rights reserved.