高吸水性聚合物对胶凝材料早期裂缝的自愈合作用

Autogenous Healing of Early-Age Cracks in Cementitious Materials by Superabsorbent Polymers.

作者信息

Hong Geuntae, Song Chiwon, Choi Seongcheol

机构信息

Department of Civil and Environmental Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea.

Structural Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-Ro, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do 10223, Korea.

出版信息

Materials (Basel). 2020 Feb 4;13(3):690. doi: 10.3390/ma13030690.

DOI:10.3390/ma13030690

PMID:32033077

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7040729/

Abstract

The effect of superabsorbent polymers (SAPs) on autogenous crack healing in cementitious materials with early-age cracking was investigated. SAP-containing samples exposed to wet/dry cycles showed better autogenous healing than those only exposed to wet conditions, as determined by water flow and compressive strength recovery tests. The water flow rates through cracks (380 ± 40 µm) in cement paste and cement mortar containing 1.0% SAP decreased by around 97.1-100% and 79.7-90.7%, respectively, after 14 cycles of healing compared to 1 cycle. Although the initial compressive strength decreased with SAP addition, it recovered somewhat after a 28-d healing period. Microscopy and spectroscopy results identified CaCO and/or calcium silicate hydrate (CSH) as the main healing products.

摘要

研究了高吸水性聚合物（SAPs）对早期开裂的胶凝材料中自愈合裂缝的影响。通过水流和抗压强度恢复试验确定，经历干湿循环的含SAP样品比仅暴露于潮湿条件下的样品具有更好的自愈合性能。与1个循环相比，含1.0% SAP的水泥净浆和水泥砂浆中，经过14个愈合循环后，通过裂缝（380±40 µm）的水流速率分别下降了约97.1 - 100%和79.7 - 90.7%。虽然添加SAP后初始抗压强度有所降低，但经过28天的愈合期后有所恢复。显微镜和光谱分析结果确定碳酸钙和/或硅酸钙水合物（CSH）为主要的愈合产物。