水泥石单一裂隙的渗流规律及其遇水自愈合性能  

Water Flow Through Single Crack in Hardened Cement Paste and Self-healing Property of Crack

作　　者：卢子臣[1] 孔祥明[1,2] 岳蕾[1] 王其春[3] 刘伟[3] 曾敏[3] 

机构地区：[1]清华大学土木工程系、教育部土木工程安全与耐久重点实验室,北京100084 [2]东南大学,先进土木工程材料协同创新中心,南京211189 [3]中国石化石油工程技术研究院,北京100101

出　　处：《硅酸盐学报》2014年第8期960-965,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(U12171176)资助项目

摘　　要：采用不同压差下的渗水实验研究了水在水泥石单一裂缝中的渗流规律及裂缝的自愈合性能。结果表明:水在水泥石单一裂缝中的渗流符合平面层流的Poiseuille定律,由此可计算得到有效裂缝宽度。通过在静态水中浸泡及动态水中的渗流实验研究了水泥石裂缝的自愈合性能。单一裂隙水泥石无论是在静态水浸泡还是在动态水连续渗流过程中均能发生自愈合现象,裂隙表面生成CaCO3晶体;低压差下已经愈合的裂缝存在临界渗流压差,当水头压差超过临界压差时可重新发生渗流。In order to clarify the water flow rule and self-healing property of cracks in harden cement paste （ HCP）, the water fluxes under various pressure differences were measured and the self-healing property was evaluated. The results show that the water flow through a single crack in hardened cement paste follows the Poiseuille law. The effective crack width can be calcu- lated based on the law. The self-healing of cracks in HCP can be achieved under conditions of either the static water immersion or the dynamic water flow. The calcium carbonate is produced on the surface of crack. The threshold pressure gradient is exited in the healed crack and the seepage of water through the healed crack can occur above the threshold pressure gradient.

关 键 词：水泥石 裂缝 渗流规律 自愈合 

分 类 号：TU525[建筑科学—建筑技术科学]