Saline-alkali resistant concrete internal curing agent as well as preparation method and application thereof: Fid-Bau Portal

Saline-alkali resistant concrete internal curing agent as well as preparation method and application thereof

SUN GUOXING / LIANG RUI / LI TINGZHONG / ZHANG CHENG

The invention relates to the technical field of concrete, in particular to a saline-alkali resistant concrete internal curing agent as well as a preparation method and application thereof. The saline-alkali resistant concrete internal curing agent is mainly prepared from a first polymer, a second polymer and a cross-linking agent, in the first polymer, the total proportion of nonionic polyacrylamide and anionic polyacrylamide is greater than or equal to 80wt%; the dosage of the second polymer is 0-10 wt% of the mass of the first polymer; the dosage of the cross-linking agent is 0.16-5wt% of the mass sum of the first polymer and the second polymer. The internal curing agent disclosed by the invention is a three-dimensional water absorption network formed by crosslinking a large number of ultra-high molecular weight polymers, the water absorption capacity is remarkably improved, a large number of long tail ends are not fixed, and the internal curing agent can stretch towards a C-H-S inorganic network of concrete and form an interpenetrating network structure with the concrete, so that the analysis resistance of the internal curing agent is remarkably improved; meanwhile, the influence on the strength of the concrete can be improved.

本发明涉及混凝土技术领域，尤其是涉及一种耐盐碱混凝土内养护剂及其制备方法和应用。耐盐碱混凝土内养护剂主要由第一聚合物、第二聚合物和交联剂制得；第一聚合物中，非离子型聚丙烯酰胺和阴离子型聚丙烯酰胺的总占比≥80wt％；第二聚合物的用量为第一聚合物的质量的0wt％～10wt％；交联剂的用量为第一聚合物和第二聚合物的质量和的0.16wt％～5wt％。本发明的内养护剂，是由大量超高分子量的聚合物交联形成的三维吸水网络，吸水能力显著提升，且具有大量长的末端未被固定，能够向混凝土的C‑H‑S无机网络伸展，与混凝土形成互穿网络结构，显著提高内养护剂的抗析性能，并提高释水均匀性，同时可以改善对混凝土强度的影响。

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