摘要
硅酸镁水泥(MSHC)作为一种新型的绿色低碳建筑材料,具有轻质多孔、碱度低、水化热低等优点,同时也存在早期力学性能发展较慢、后期容易产生开裂等问题。本文主要探讨了高温(50℃)养护、高吸水树脂(SAP)内养护、SAP+高温(50℃)养护等不同方式对MSHC力学性能的影响,并采用XRD、SEM、综合热分析、固体核磁共振硅谱分析等方法分析其机理。研究结果表明:相比于单独使用高温(50℃)养护或SAP内养护的方式,采取SAP+高温(50℃)的综合养护方式可以显著提高MSHC早期抗压强度,促进水化反应,3和28 d抗压强度可分别达34.8和61.0 MPa;高温养护加速了MgO-SiO_(2)-H_(2)O(M-S-H)凝胶的生成;SAP+高温(50℃)的养护方式能更有效地促进MgO的水化和生成更多的M-S-H凝胶。
As a new type of green and low-carbon building material,magnesium silicate cement(MSHC)has the advantages of light,porosity,low alkalinity and low hydration heat,but it also has some problems such as slow development of mechanical properties in the early stage and easy cracking in the later stage.In this paper,the effects of curing methods such as high temperature(50℃)curing,high water absorbent resin(SAP)curing,SAP+high temperature(50℃)curing on the mechanical properties of MSHC were discussed,and the mechanism was analyzed by XRD,SEM,comprehensive thermal analysis and solid state nuclear magnetic resonance silicon spectroscopy.The results show that compared with high temperature(50℃)curing or SAP curing alone,SAP+high temperature(50℃)curing can significantly improve the early compressive strength of MSHC,promote hydration reaction,and its 3 and 28 d compressive strength can reach 34.8 and 61.0 MPa,respectively.High temperature curing accelerates the formation of MgO-SiO_(2)-H_(2)O(M-S-H)gel.SAP+high temperature(50℃)curing method can more effectively promote the hydration of MgO and generate more M-S-H gel.
作者
李相国
包璐超
何晨昊
张呈山
吕阳
LI Xiangguo;BAO Luchao;HE Chenhao;ZHANG Chengshan;LYU Yang(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;Xinjiang Longtaida Environmental Proteetion Building Materials Technology Development Co.,Ltd.,Wujiaqu 831300,China)
出处
《硅酸盐通报》
北大核心
2025年第7期2368-2377,共10页
Bulletin of the Chinese Ceramic Society
基金
兵团科技计划项目(2023AB013-03)
高分子材料湖北省重点实验室2023年度开放基金项目。
关键词
硅酸镁水泥
养护制度
高吸水树脂
力学性能
水化程度
综合热分析
固体核磁
magnesium silicate cement
curing system
SAP
mechanical property
degree of hydration
comprehensive thermal analysis
solid state nuclear magnetism
