纳米二氧化硅负载丙烯酰胺型SAP内养护性能研究  

Internal Curing Properties of Acrylamide Type SAP Loaded with Nano Silica

作　　者：吕阳[1,2] 范福龙 吴远帅 朱艳超 张呈山 李相国 LYU Yang;FAN Fulong;WU Yuanshuai;ZHU Yanchao;ZHANG Chengshan;LI Xiangguo(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;Hubei Key Laboratory of Polymer Materials,Hubei University,Wuhan 430062,China;Xinjiang Longtaida Environmental Protection Building Materials Technology Development Co.,Ltd.,Wujiaqu 831300,China)

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [2]湖北大学高分子材料湖北省重点实验室,武汉430062 [3]新疆隆泰达环保建材科技发展有限公司,五家渠831300

出　　处：《硅酸盐通报》2024年第7期2393-2403,共11页Bulletin of the Chinese Ceramic Society

基　　金：兵团重点科技攻关计划项目(2023AB013-03);高分子材料湖北省重点实验室2023年度开放基金项目。

摘　　要：设计制备了纳米二氧化硅(NS)负载丙烯酰胺型高吸水树脂(SAP),探究了不同NS负载量的SAP对砂浆自收缩、干燥收缩和力学性能的影响。结果表明,丙烯酰胺型SAP能够完全消除砂浆自收缩,而随着NS负载量增加,负载型SAP对自收缩的抑制作用降低,但仍保持在80%以上。SAP及额外水的引入增加了砂浆的干燥收缩,但随着NS负载量增加,负载型SAP对缓解干燥收缩有积极作用。SAP及额外水的引入降低了砂浆的力学性能,但随着NS负载量增加,负载型SAP显著改善了砂浆的力学性能。其中,负载50%(相对于丙烯酰胺的质量分数)NS的SAP对砂浆力学性能影响最小,试样在28 d龄期的抗压强度与抗折强度仅损失5.6%与2.2%。热重(TG)以及背散射扫描电子显微镜(BSE)结果表明,随着NS负载量增加,负载型SAP内养护试样的水化程度显著提高,微观结构明显改善。In this paper,nano silica(NS)loaded acrylamide-type superabsorbent polymer(SAP)was designed and prepared,and the influence of different NS loadings of SAP on the autogenous shrinkage,drying shrinkage,and mechanical properties of mortar were investigated.The results showed that acrylamide-type SAP could completely eliminated the autogenous shrinkage of mortar,and the inhibition effect of NS-loaded SAP on autogenous shrinkage decreased with the increase of NS loading,but still remained above 80%.The introduction of SAP and additional water increased the drying shrinkage of mortar,but with the increase of NS loading,NS-loaded SAP had a positive effect on mitigating the drying shrinkage.The introduction of SAP and additional water reduced the mechanical properties of the mortar,but with the increase of NS loading,the NS-loaded SAP significantly improved the mechanical properties of mortar.In particular,SAP loaded with 50%(relative to the mass fraction of acrylamide)NS had the least effect on the mechanical properties of the mortar,with only a 5.6%and 2.2%loss in compressive and flexural strength of the specimens at 28 d.TG and BSE results showed that the degree of hydration of the cured specimens within NS-loaded SAP increased significantly with the increase of NS loading,and the microstructure was significantly improved.

关 键 词：纳米二氧化硅 高吸水树脂 砂浆 自收缩 干燥收缩 力学性能 水化程度 微观结构 

分 类 号：TU525[建筑科学—建筑技术科学]