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
吕阳 1范福龙 2吴远帅 2朱艳超 3张呈山 4李相国5
作者信息
- 1. 武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;湖北大学高分子材料湖北省重点实验室,武汉 430062
- 2. 武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070
- 3. 湖北大学高分子材料湖北省重点实验室,武汉 430062
- 4. 新疆隆泰达环保建材科技发展有限公司,五家渠 831300
- 5. 武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;新疆隆泰达环保建材科技发展有限公司,五家渠 831300
- 折叠
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.
Abstract
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Key words
nano silica/superabsorbent polymer/mortar/autogenous shrinkage/drying shrinkage/mechanical property/degree of hydration/microstructure引用本文复制引用
基金项目
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()
出版年
2024
国家科技期刊平台
NSTL
万方数据