Conventional cement admixtures used in order to enhance the flowability of a cement composition or prevent slump loss are problematic in that their performances are unsatisfactory or they cause heterogeneity of a cement composition. To solve these problems, the invention provides a cement admixture comprising a crosslinked polymer wherein a linkage having a structural unit comprising at least one divalent group represented by formula (I) is formed between the main chains each having a structure of a water-soluble polymer with a molecular weight of 500 to 100,000(1), wherein R1 and R2 represent each independently (a) or (b) provided that R1 may be absent when R2 represents (c); and R and R1 represent each independently an alkyl group having 1 to 5 carbon atoms.
传统的
水泥外加剂用于提高
水泥组合物的流动性或防止坍落度损失,但其性能不尽人意或导致
水泥组合物的异质性,因而存在问题。为了解决这些问题,本发明提供了一种由交联聚合物组成的
水泥外加剂,其中在每条具有分子量为 500 至 100,000(1) 的
水溶性聚合物结构的主链之间形成了具有由至少一个二价基团组成的结构单元的连接体,其中 R1 和 R2 各自独立地代表(a)或(b),但当 R2 代表(c)时,R1 可以不存在;R 和 R1 各自独立地代表具有 1 至 5 个碳原子的烷基。