超细矿渣粉和偏高岭土对硫铝酸盐水泥早期收缩性能的影响  

Effects of Ultrafine Ground Granulated Blast Furnace Slag and Metakaolin on Early-Age Shrinkage of Calcium Sulfoaluminate Cement

作　　者：刘艳玲 廖宜顺[1,2] 李亚刚 LIU Yanling;LIAO Yishun;LI Yagang(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;Institute of High Performance Engineering Structure,Wuhan University of Science and Technology,Wuhan 430065,China;WISDRI City Construction Engineering&Research Incorporation Ltd,Wuhan 430223,China)

机构地区：[1]武汉科技大学城市建设学院,武汉430065 [2]武汉科技大学高性能工程结构研究院,武汉430065 [3]中冶南方城市建设工程技术有限公司,武汉430223

出　　处：《硅酸盐通报》2022年第6期2090-2097,2116,共9页Bulletin of the Chinese Ceramic Society

基　　金：长江科学院开放研究基金(CKWV2019756/KY);国家自然科学基金(51608402)。

摘　　要：通过开展化学收缩、自收缩与干燥收缩试验,研究了超细矿渣粉和偏高岭土对硫铝酸盐水泥早期收缩性能的影响。结果表明,掺入超细矿渣粉与偏高岭土会增大水泥浆体的内部相对湿度,能有效抑制水泥浆体的化学收缩、自收缩与干燥收缩,且掺量越大,抑制效果越明显,根据水泥浆体的内部相对湿度能够大致判断其自收缩的变化规律。掺入超细矿渣粉与偏高岭土会加快硫铝酸盐水泥的早期水化,使化学收缩变化速率达到峰值的时间提前。当超细矿渣粉的掺量为20%(质量分数,下同)或偏高岭土的掺量为10%、20%时,与空白组相比水泥浆体的7 d自收缩分别减小了42.21%、35.89%和63.73%,7 d干燥收缩分别减小了24.89%、16.42%和30.87%。在相同掺量条件下,掺入偏高岭土的水泥浆体化学收缩、自收缩与干燥收缩显著小于掺入超细矿渣粉的水泥浆体。自收缩与线性化学收缩的比值随龄期的增长而减小,掺入超细矿渣粉与偏高岭土后,自收缩与线性化学收缩的比值进一步减小。The influence of ultrafine ground granulated blast furnace slag(UFS)and metakaolin(MK)on the chemical shrinkage,autogenous shrinkage and drying shrinkage of calcium sulfoaluminate(CSA)cement were studied.The results indicate that the addition of UFS and MK increases the internal relative humidity of cement paste.The chemical shrinkage,autogenous shrinkage and drying shrinkage of cement paste decrease with the increase of UFS and MK.The autogenous shrinkage can be predicted roughly by the internal relative humidity of cement paste.The incorporation of UFS and MK accelerate the early hydration of cement paste.The time for chemical shrinkage to reach peak value is ahead with the addition of UFS and MK.The autogenous shrinkage and drying shrinkage of the cement paste with 20%(mass fraction,the same below)UFS or 10%,20%MK are less than that of the control sample.Among them,the autogenous shrinkage of cement paste at 7 d decreases by 42.21%,35.89% and 63.73%,respectively,and the drying shrinkage at 7 d decreases by 24.89%,16.42% and 30.87%,respectively.In addition,the pastes with MK show less chemical shrinkage,autogenous shrinkage and drying shrinkage than that of the pastes with the same content of UFS.The proportion of autogenous shrinkage to linear chemical shrinkage decreases with the increase of curing time,and decreases with the incorporation of UFS and MK.

关 键 词：硫铝酸盐水泥 超细矿渣粉 偏高岭土 化学收缩 自收缩 干燥收缩 

分 类 号：TU525[建筑科学—建筑技术科学]