张丰,白银,陈波,宁逢伟,吕乐乐,胡海明

• 1:南京水利科学研究院
• 2:水文水资源与水利工程科学国家重点实验室

摘要(Abstract)：

为探究防裂剂对混凝土综合性能的影响，研究掺不等量防裂剂条件下混凝土的工作性、力学性能，并且采用平板开裂、温度-应力试验方法分析防裂剂对混凝土抗裂性能的影响。结果表明：防裂剂对新拌混凝土工作性影响不大，但可改善混凝土力学性能和抗冻性能，掺8%防裂剂，混凝土7 d、28 d、60 d抗压强度较基准混凝土分别提高16.0%、17.3%和9.2%。防裂剂的掺入可增大混凝土极限拉伸值4.4%～15.6%,降低混凝土干缩20%～30%,同时可使平板混凝土裂缝数量明显减少，单位面积总开裂面积减小72.4%～83.3%。与基准混凝土相比，掺防裂剂混凝土压应力增大，第二零应力出现时间延后，开裂温降提高5～15℃,抗裂性得到显著改善。

关键词(KeyWords)： 防裂剂;混凝土;综合抗裂性;温度-应力试验;收缩

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目(2018YFC0406702);; 国家自然科学基金项目(51739008);; 中央级公益性科研院所基本科研业务费专项(Y419004)

作者(Author): 张丰,白银,陈波,宁逢伟,吕乐乐,胡海明

DOI: 10.13928/j.cnki.wrahe.2022.02.015

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