Effect of wetting drying cycles on mode I and mode II fracture toughness of cement mortar and concrete

被引：49

作者：

Dehestani, Arash ^{[1
]}

Hosseini, Mehdi ^{[1
]}

Beydokhti, Alireza Taleb ^{[1
]}

机构：

[1] Imam Khomeini Int Univ, Qazvin, Iran

来源：

THEORETICAL AND APPLIED FRACTURE MECHANICS | 2020年 / 106卷

关键词：

Wetting-drying cycles; Mode I and mode II fracture toughness; Cement mortar; Concrete; Chevron notch; RECLAIMED ASPHALT PAVEMENT; STRAIN-BASED CRITERIA; TRANSPORT-PROPERTIES; FLY-ASH; COMPOSITES; STRENGTH; DURABILITY; ENERGY;

D O I：

10.1016/j.tafmec.2019.102448

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Cement mortar and concrete are affected by wetting-drying cycles due to variable precipitation and evaporation rates and changes in the level of water reservoirs in most development projects such as dam construction projects. The alternating interaction of water with cement mortar and concrete affects mode I and mode II fracture toughness and accelerates their erosion rate. Hence, it is necessary to evaluate the effect of wetting-drying cycles on mode I and mode II fracture toughness. Cement mortar and concrete specimens were prepared for this purpose. The mode I and mode II fracture toughness were determined by conducting tests on centrally cracked Brazilian disc (CCBD) specimens. A chevron notch and a straight-through crack were created respectively in cement mortar and concrete specimens. The specimens were loaded after 0 (the specimen subject to no wetting-drying cycles), 1, 4, 8, 16 and 20 wetting-drying cycles. The mode I and mode II fracture toughness of cement mortar and concrete decreased with increasing the number of wetting-drying cycles. Porosity and paste volume (cement and water volume) were identified as the main factors reducing fracture toughness and fracture toughness reduction rate.

引用

页数：12

共 47 条

[1] Fracture study of concrete composites with synthetic fibers additive under modes I and III using ENDB specimen [J].