Effect of degree of ceramsite prewetting on the cracking behaviour of LWAC
Effect of degree of ceramsite prewetting on the cracking behaviour of LWAC
复制标题
陶粒预润湿程度对LWAC开裂行为的影响
DOI：
10.1680/macr.11.00128
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发表时间：
2012-08
影响因子：
2.7
通讯作者：
Lin, Xujian
中科院分区：
文献类型：
--
作者：
Ji, Tao;Chen, Caiyi;Zhuang, Yizhou;Lin, Xujian
采用U型管微压测试装置、扫描电镜试验和新型约束收缩环试验装置，分别研究了轻骨料混凝土（LWAC）的吸放水过程、界面过渡区（ITZ）和开裂行为。研究表明，随着预湿程度的增加，陶粒嵌入轻集料中的吸水能力下降，而脱附能力提高，轻集料界面变得致密。预湿0 h、1 h和24 h的轻骨料混凝土环的开裂龄期分别为10.7、15.3和25 d。在28天龄期时，轻骨料混凝土环的裂缝宽度随陶粒预湿程度的增加而减小。同时，随着预湿程度的增加，轻骨料混凝土环的收缩开裂性能得到改善。研究结果为制备具有较好抗裂性能的轻骨料混凝土提供了思路。
The water absorption and desorption process, the interfacial transition zone (ITZ) and the cracking behaviour of lightweight aggregate concrete (LWAC) were obtained by a U-tube micro-pressure measurement device, a scanning electron microscopy test and a new restrained-shrinkage ring device, respectively. The study reveals that, with the increase in degree of ceramsite prewetting, the water absorption ability declines, while the water desorption ability improves for ceramsites embedded in the LWAC, and the ITZ of the LWAC becomes compact. The cracking ages of the LWAC rings with ceramsites prewetted for 0 h, 1 h and 24 h are respectively 10·7 days, 15·3 days and 25 days. At the age of 28 days, the crack width of LWAC rings decreases with the increase in degree of ceramsite prewetting. Also, with the increase in degree of ceramsite prewetting, the restrained-shrinkage cracking behaviour of the LWAC rings improves. The research results provide clues for the preparation of the LWAC with better crack-resistant...
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