Comprehensive tests and quasi-brittle fracture modeling of light-weight foam concrete with expanded clay aggregates
Comprehensive tests and quasi-brittle fracture modeling of light-weight foam concrete with expanded clay aggregates
复制标题
膨胀粘土骨料轻质泡沫混凝土综合试验及准脆性断裂建模
DOI：
10.1016/j.cemconcomp.2020.103822
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发表时间：
2021-01-01
影响因子：
10.5
通讯作者：
Xiao, Yiqiang
中科院分区：
文献类型：
--
作者：
Lu, Yao;Hu, Xiaozhi;Xiao, Yiqiang
Expanded Clay Foam Concrete (eC-FC) is a light-weight foam concrete with expanded clay aggregates, which is an important class of building materials, yet its tensile strength f(t) and fracture toughness K-IC cannot be easily measured using small test samples due to its highly heterogeneous microstructures. This study presents a simple closed-form model for quasi-brittle fracture of heterogeneous solids confirmed by comprehensive three-point-bend (3-p-b) test results from 168 notched eC-FC specimens with eight group sample designs. One tensile strength ft was determined from individual group or all from the model initially developed for normal concrete, proving both the trans-granular fracture in eC-FC and inter-granular fracture in normal concrete can be modeled by this fracture model. Unidirectional compressive tests of the eC-FC were also performed, and tensile strength f(t) estimated from the compressive strength f(c) is consistent with f(t) from 3-p-b tests. Fracture toughness K-IC was determined from the model using tensile strength f(t) and the average aggregate size G.
