硅酸盐通报2025，Vol.44Issue(7)：2447-2457,2473,12.DOI:10.16552/j.cnki.issn1001-1625.2024.1471
基于高吸水性树脂内养护改善机制砂混凝土收缩开裂性能
Improving Shrinkage and Cracking Resistance of Manufactured Sand Concrete Through Internal Curing with Super-Absorbent Polymer
摘要
Abstract
To enhance the crack resistance of manufactured sand concrete in the arid and cold northwest environment(temperature 5 ℃,humidity 30％),super-absorbent polymer(SAP)was used as an internal curing material.Drying shrinkage,autogenous shrinkage,flat crackingand and compressive strength tests were conducted to analyze the effect of SAP on the early-age shrinkage cracking and mechanical properties of manufactured sand concrete.Isothermal calorimetry and thermogravimetric analysis were utilized to study the impact of SAP internal curing on cement hydration.The results indicate that SAP can effectively increase the early hydration degree of cementitious materials,reduce the risk of shrinkage and cracking of manufactured sand concrete in the arid and cold northwest environment,extend the cracking time of manufactured sand concrete,and reduce the cracking area.The effect of SAP after water absorption treatment is more significant,and the optimal SAP pre-absorption capacity is 6％.Further analysis through thermogravimetric and hydration heat tests reveal that SAP improves internal humidity through a water absorption and slow-release mechanism,prolonging the hydration reaction time and thereby enhancing crack resistance.However,the introduction of SAP increases porosity,leading to decrease concrete strength.关键词
寒旱环境/高吸水性树脂/机制砂混凝土/干燥收缩/开裂Key words
arid and cold environment/super-absorbent polymer/manufactured sand concrete/drying shrinkage/cracking分类
建筑与水利引用本文复制引用
张文龙,冯滔滔,王凤娟,张宇,王习,蒋金洋..基于高吸水性树脂内养护改善机制砂混凝土收缩开裂性能[J].硅酸盐通报,2025,44(7):2447-2457,2473,12.基金项目
国家自然科学基金区域联合重点项目(U21A20150) （U21A20150）
国家自然科学基金(52208249 （）
52208292) （）
