掺SAP对混凝土抗冻性的影响及其作用机制探讨  

Effect and Mechanism of SAP on Freezing Resistance of Concrete

作　　者：周孝军[1] 罗航林 杨婷婷[2] 杨元意[2] 丁庆军[3] ZHOU Xiaojun;LUO Hanglin;YANG Tingting;YANG Yuanyi;DING Qingjun(School of Architecture and Civil Engineering,Xihua University,Chengdu 610039 China;School of Civil Engineering and Geomatics,Southwest Petroleum University,Chengdu 610500 China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070 China)

机构地区：[1]西华大学建筑与土木工程学院,四川成都610039 [2]西南石油大学测绘与土木工程学院,四川成都610500 [3]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《西华大学学报(自然科学版)》2025年第3期87-93,共7页Journal of Xihua University:Natural Science Edition

基　　金：四川省自然科学基金项目(2024NSFSC0163)。

摘　　要：高吸水性树脂(superabsorbent polymers,SAP)具有良好的保水和储水性能,是混凝土内养护和强化抗冻较好的性能材料之一。本文阐述了SAP增强混凝土抗冻性能的机制,同时总结分析了不同参数对混凝土抗冻性能的影响。分析表明:SAP的释水行为主要分为渗透压控制阶段和湿度控制阶段,释水后的SAP在混凝土中能形成宏观孔隙和凝胶孔隙,提高混凝土抗冻性能;SAP的掺量、粒径以及掺入方式等因素均会影响混凝土的抗冻性能,最佳掺量和粒径应分别根据SAP的吸水性和气孔间距系数而定,干燥掺入方式更有利于提升混凝土的抗冻性能。针对目前存在的问题,提出后续可研究不同水胶比下掺SAP对混凝土抗冻性能的影响,建立不同水胶比下SAP孔隙大小与混凝土抗冻性能的相关模型。Superabsorbent polymers(SAP)exhibit excellent water retention and storage properties,and is one of the preferred materials for internal curing and enhancing the freeze-thaw resistance of con-crete.This paper explores the mechanism by which SAP enhances this property and reviews the effects of various parameters on concrete freeze-thaw resistance.The results indicate that the water release behavior of SAP primarily consists of an osmotic pressure-controlled stage and a humidity-controlled stage.Post wa-ter release,SAP forms macro pores and gel pores within the concrete,thereby enhancing its freeze-thaw resistance.Factors such as the dosage,particle size,and mixing method of SAP all influence the freeze-thaw resistance of concrete.The optimal dosage and particle size should be determined based on the water absorbency of SAP and the air-void spacing factor,respectively,with dry mixing being more beneficial for enhancing the freeze-thaw resistance of concrete.In view of the existing problems,it is suggested that the influence of SAP on the freezing resistance of concrete under different water-binder ratio can be studied in the future,establish a correlation model between SAP pore size and frost resistance of concrete under differ-ent water-to-binder ratios.

关 键 词：高吸水性树脂 混凝土 抗冻性能 孔隙结构 

分 类 号：U444[建筑科学—桥梁与隧道工程] TU528[交通运输工程—道路与铁道工程]