An analytical approach to predict fracture parameters of coral aggregate concrete immersed in seawater

被引:40
|
作者
Yang, Shutong [1 ,2 ]
Zhang, Xianshun [1 ]
Yu, Miao [1 ]
Yao, Jie [1 ]
机构
[1] Ocean Univ China, Coll Engn, Dept Civil Engn, Qingdao 266100, Shandong, Peoples R China
[2] Qingdao Univ Technol, Cooperat Innovat Ctr Engn Construct & Safety Shan, Qingdao 266033, Shandong, Peoples R China
基金
中国国家自然科学基金;
关键词
Coral aggregate concrete; Fracture parameters; Average aggregate size; Maximum fracture load; Immersion in seawater; NORMAL-DISTRIBUTION PERTINENT; TENSILE-STRENGTH; PROCESS ZONE; MECHANICAL-PROPERTIES; ENERGY; TOUGHNESS; DURABILITY; BEHAVIOR; ROCK; SLAG;
D O I
10.1016/j.oceaneng.2019.106508
中图分类号
U6 [水路运输]; P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
An analytical approach is proposed to predict the fracture parameters of coral aggregate concrete (CAC). Both the size-independent tensile strength and fracture toughness are related to the maximum fracture load linearly based on the boundary effect model by incorporating the average aggregate size. Moreover, an explicit expression is derived to correlate the maximum fracture load with the local fracture energy at the crack-tip region. The local fracture energy distribution and size-independent fracture energy are then determined by virtue of the maximum fracture load. Four groups of three-point-bending notched CAC beams are tested by considering two ages and two environmental conditions (immersion in seawater or not) and the initial crack length-to-beam depth ratios are set from 0.1 to 0.7 in each group. Results show that the failure modes of all the specimens are coral coarse aggregate fracture without interfacial debonding between the aggregate and surrounding mortar. The average values of tensile strength, fracture toughness and fracture energy can be obtained in each group by using the experimentally measured maximum fracture loads and the experimental scatters were analyzed based on normal distribution analysis. All the fracture parameters increase with the age and become larger if the specimens were immersed in seawater.
引用
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页数:14
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