摘要
聚羧酸减水剂与水泥的相容性问题显著影响新拌混凝土的流变性能,一直是水泥混凝土领域研究的热点.首先综合国内外文献与实际工程应用需求提出了相容性的定义,接着归纳了聚羧酸减水剂分子的酸醚比和侧链长度以及水泥的熟料矿物组成、碱含量、石膏含量、水泥细度和温度对相容性的影响,然后从流变学的角度建立相容性的评价体系,讨论并对比了净浆流动度法、Marsh筒法、Bingham模型以及触变性方法在评价相容性时的具体应用.在此基础上,对今后相容性问题的研究进行了展望.
Abstract
The compatibility between polycarboxylate superplasticizer and cement significantly affects the rheological properties of fresh concrete,and has always been a hot topic in the field of cement and concrete research.Firstly,the definition of compatibility is proposed comprehensively based on the domestic and foreign literature and the practical engineering application requirements.Then,the influences of acid-ether ratio and side chain length of polycarboxylate superplasticizer molecules,as well as the clinker mineral composition,alkali content,gypsum content,cement fineness,and temperature on compatibility are summarized.Subsequently,the evaluation system of compatibility is established from the perspective of rheological properties,and the specific applications of methods such as fresh paste fluidity,Marsh cone method,Bingham model,and thixotropy in evaluating compatibility are discussed and compared.Based on this,a prospect for future research on compatibility is presented.
基金项目
湖南省自然科学基金(2021JJ50044)
湖南省自然科学基金(2022JJ50072)
中国水利水电科学研究院水利部水工程材料重点实验室开放研究基金(EMF202405)
NETL
NSTL
万方数据