防止堆石坝面板混凝土收缩裂缝方法的研究

Methods for Preventing Concrete Face Slab from Producing Shrinkage Cracks in Concrete Face Rockfill Dams

对面板堆石坝混凝土面板收缩裂缝的成因进行了分析,从裂缝控制理论、补偿收缩混凝土面板防裂设计、面板防裂材料及面板防裂施工等方面采取一系列技术措施来防止混凝土面板收缩裂缝的方法.尤其是对VF防裂剂的膨胀时间和膨胀量人为可控的特点及由其制作的补偿收缩混凝土在实际工程中应用的效果作了详细的论述,结果表明均取得了理想的防裂效果.

In this paper the causes of shrinkage cracks in concrete face slab are described.A series of technical measures are adopted to control the shrinkage cracks in concrete face slab.These measures include crack control theory,shrinkage compensation concrete design,the use of concrete anti-crack additive in concrete face slab,and concrete anti-crack construction.Furthermore,the character that expansion rate and expansion time in VF concrete anti-crack additive can be controlled artificially and the effects in engineering application have been explained.