水利水电科技进展2024，Vol.44Issue(1)：66-72,7.DOI:10.3880/j.issn.1006-7647.2024.01.010
不同水灰比条件下碳酸钙晶须对水泥净浆收缩性能的影响
Influence of calcium carbonate whiskers on shrinkage performance of cement paste with different water cement ratios
摘要
Abstract
To investigate the effect of calcium carbonate whiskers on the shrinkage properties of cement paste,dry shrinkage,chemical shrinkage and autogenous shrinkage of specimens with three kinds of water cement ratios were tested at different ages,respectively.The phase composition and pore structure changes of the autogenous shrinkage specimens were characterized using X-ray diffraction(XRD)and mercury intrusion porosimetry(MIP),respectively.The results show that calcium carbonate whiskers have the characteristics of adsorbing and transferring free water in cementitious materials.Under different water cement ratios,calcium carbonate whiskers exhibit different effects on drying shrinkage,and the degree of influence shows a trend of initially increasing and then decreasing with the dosage of calcium carbonate whiskers.The chemical shrinkage shows a tendency of increasing and then decreasing with its dosage.Calcium carbonate whiskers can significantly improve the self-shrinkage,especially the early autogenous shrinkage,and the increase of the water cement ratio makes the improvement of the early autogenous shrinkage by calcium carbonate whiskers more significant.The whiskers refine the pore structure without generating new hydration products.关键词
水泥净浆/碳酸钙晶须/水灰比/干燥收缩/化学收缩/自收缩Key words
cement paste/calcium carbonate whiskers/water cement ratio/dry shrinkage/chemical shrinkage/autogenous shrinkage分类
建筑与水利引用本文复制引用
郑忠良,尤博,张兆彪,李宇翔,曹明莉..不同水灰比条件下碳酸钙晶须对水泥净浆收缩性能的影响[J].水利水电科技进展,2024,44(1):66-72,7.基金项目
国家自然科学基金项目(51678111) （51678111）
大连理工大学-中国二十二冶集团有限公司校企合作项目(HX20200728) （HX20200728）
