摘要
工程水泥基复合材料,简称为ECC(Engineered Cementitious Composite),是一种基于微观力学的新型材料,因其具有优异的延性与韧性的优点而备受关注。然而,ECC比传统混凝土自收缩更高,易导致开裂,是工程上的共性难题,其调控方法值得深入研究。基于国内外研究现状,综合评述了水泥基材料自身收缩的调控方法,包括内养护法、矿物掺合料法和外加剂法等。其中,内养护剂有高吸水树脂和轻质多孔材料等,矿物掺合料包括硅灰、矿渣、粉煤灰等,外加剂包括减缩剂与膨胀剂等;各类调控方法均能使水泥基材料的自收缩得到显著改善,但对抗压强度的影响不能被忽视。
Engineering Cementitious Composite(ECC)is a type of new cementitious material based on micromechanics.Its excellent ductility and toughness has gained great attention in the field of construction.However,its autogenous shrinkage is much higher than traditional concrete,which is prone to cause initial and surface cracking.Such engineer problems indicate that further study on shrinkage control methods is desperately essential.Based on previous researches at home and abroad,autogenous shrinkage control methods of cementitious materials are reviewed,including internal curing,mineral admixtures and shrinkage reducing admixtures.In detail,the internal curing agent includes super absorbent polymer and light porous material.Silica fume,slag and fly ash as mineral admixtures reduce autogenous shrinkage to some extent.Furthermore,shrinkage reducing agent and expansion agent show excellent shrinkage reducing effect in the tests.The above methods effectively control the autogenous shrinkage of cementitious materials at different levels,however,the influence of compressive strength shall not be ignored at the mean time.
作者
巫向晖
甘伟
何坚强
王庆
Wu Xianghui;Gan Wei;He Jianqiang;Wang Qing(Guangzhou Liqiang Walling Material Company Ltd.Guangzhou 510800,China;Department of Civil Engineering,Guangzhou University Guangzhou 510006,China)
出处
《广东土木与建筑》
2020年第7期98-101,共4页
Guangdong Architecture Civil Engineering
关键词
ECC
自收缩
内养护
调控
ECC
autogenous shrinkage
internal curing
control
