Abstract Concrete drying shrinkage is a major practical problem, but it can be ameliorated by means of “shrinkage-reducing agents” (SRAs). Water vapor sorption isotherms and low temperature DSC measurements suggest that alcohol-ethylene oxide polymers (AEOPs) with a better hydrophilic-lipophilic (HL-) balance are present in meso-pores in which water molecules evaporate from 75% RH to 40% RH. Short-term drying shrinkage measurements show that the better HL-balanced AEOPs reduce irreversible shrinkage, which occurs mainly from 75% RH to 40% RH during the first drying. Based on the similarity between corresponding RH regions, it is concluded that the better HL balanced AEOP in relevant meso-pores hinders agglomeration of C-S-H during the first desorption to mitigate the irreversible shrinkage and reduce the first drying shrinkage.

中文翻译：

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醇-环氧乙烷聚合物对降低水泥浆收缩的作用

摘要 混凝土干缩是一个重大的实际问题，但可以通过“减缩剂”（SRA）来改善。水蒸气吸附等温线和低温 DSC 测量表明，具有更好亲水-亲油 (HL-) 平衡的醇-环氧乙烷聚合物 (AEOP) 存在于中孔中，其中水分子从 75% RH 蒸发到 40% RH。短期干燥收缩测量表明，较好的 HL 平衡 AEOP 减少了不可逆收缩，这种收缩主要发生在第一次干燥期间从 75% RH 到 40% RH。基于相应RH区域之间的相似性，可以得出结论，相关介孔中更好的HL平衡AEOP阻碍了CSH在第一次解吸过程中的团聚，从而减轻了不可逆收缩并减少了第一次干燥收缩。