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掺化学外加剂水泥净浆的含气量稳定性与流变性能的关系(英文)
作者: 海1 2  强1 邓德华1 彭建伟2 黄艳玲1 
单位:(1. 中南大学土木工程学院高速铁路建设国家工程实验室 长沙 410075  2. 中铁四局安徽中铁工程材料科技有限公司 合肥 230023) 
关键词:含气量稳定性 消泡剂 增稠剂 水泥 
分类号:TU528
出版年,卷(期):页码:2019,47(11):0-0
DOI:
摘要:

 混凝土中的含气量是影响其新拌与硬化性能的关键因素之一。然而一些混凝土,特别是自密实混凝土(SCC),通常具有较高的含气量,含气量稳定性对混凝土的抗冻性能和混凝土表面外观有重要影响。通过测定水泥净浆中含气量随时间的演化规律,研究水泥浆中含气量的稳定性。相应地,测试了水泥浆体流变性能的变化规律;研究了超塑化剂、消泡剂、无机和有机增粘剂(VEA)等外加剂对水泥净浆含气量稳定性和流变性能的影响。结果表明:含气量、气泡的大小及其表面特性共同影响着水泥浆体的含气量稳定性;3×10–4聚氧亚烷基醚型消泡剂与2×10–4羟丙基甲基纤维素的复掺可达到最高的含气量稳定性和最低的含气量。

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