文献类型：期刊文献

英文题名：Thixotropy of fresh cement pastes in presence of cationic polymer

作者：Wen, Pengpeng[1];Feng, Zhongjun[2,3];Zheng, Baicun[1,4]

机构：[1]East China Univ Sci & Technol, Res & Dev Ctr Sports Mat, Shanghai 200237, Peoples R China;[2]Shanghai Sunrise Polymer Mat Co Ltd, Shanghai 200231, Peoples R China;[3]Shanghai Engn Res Ctr Construct Admixture, Shanghai 200231, Peoples R China;[4]130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2023

卷号：394

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：;EI(收录号：20232714331156);WOS:【SCI-EXPANDED(收录号:WOS:001053639900001)】；

语种：英文

外文关键词：Thixotropy; Cement paste; Cationic polymer; Na-bentonite

摘要：Cationic polymer can effectively improve the clay tolerance of polycarboxylate superplasticizer in cement pastes, but the thixotropy of fresh cement pastes in presence of cationic polymer has not received sufficient attention. In this paper, the effect of cationic polymer on the thixotropy of fresh cement pastes containing Na-bentonite was studied. The hydration heat was considered and measured. Besides hysteresis loop areas, the destruction and reconstruction of flocs in thixotropic behaviors of cement pastes were also investigated. The results showed that the cationic polymer delayed the release of cement hydration and decreased the total hydration heat. Cement hydration improved the thixotropy of cement pastes. An obvious decrease of hysteresis loop areas of cement pastes was observed with the addition of cationic polymer, which indicated the decrease of the thixotropy. The equilibrium shear stress, characteristic time of destruction of flocs and incipient structural parameter in thixotropic behaviors were also decreased with the addition of cationic polymer. On the other hand, cationic polymer increased the reconstruction rate of flocculated structure in cement pastes.