粉煤灰对混凝土楼板裂缝的影响  

Crack on Concrete Floor Affected by Fly-Ash

作　　者：朱跃武[1] 罗宾[1] 周宇翔[1] 张建宁[1] 

机构地区：[1]中国建筑科学研究院深圳分院,广东深圳518057

出　　处：《工程质量》2008年第9期18-20,29,共4页Construction Quality

摘　　要：针对某混凝土框架结构楼面板出现的大面积龟裂及部分梁出现竖向细微裂缝问题,对该楼板进行了检测鉴定。根据混凝土强度、水泥安定性检测结果以及粉煤灰安定性试验、有关原始资料分析,认为施工时采用高烧失量的粉煤灰,导致混凝土初凝时间提前,在二次抹平时引起已初凝的混凝土楼板振动,是楼板产生裂缝的主要原因,并就善后处理提出建议。The floor which have many chap crack and some beam which have vertical fine cracks was tested and appraised. Based on concrete strength and the tested result of cement and fly-ash invariability and other original data, the reason of cracking on the floor mostly is the concrete initial setting-time ahead when High-Ignition Fly Ash adapted during construction, and concrete floor vibration when the second smoothing. The deal with problems was proposed.

关 键 词：混凝土 粉煤灰 安定性 烧失量 裂缝 二次振捣 

分 类 号：TU712.4[建筑科学—建筑技术科学]