城市建筑2025，Vol.22Issue(22)：208-212,5.DOI:10.19892/j.cnki.csjz.2025.22.53
碱激发砒砂岩复合胶凝材料在建筑墙体保温系统中的应用技术研究
Study on the Application Technology of Alkali-Activated Pisha Sandstone Composite Cementitious Material in Building Wall Thermal Insulation Systems
摘要
Abstract
To achieve the resource utilization of Pisha sandstone and to promote the green development of building energy-saving materials,this paper employed mechanical ball milling and high-temperature calcination to activate and pretreat Pisha sandstone.Combined with alkali activation technology,it was compounded with mineral powder to prepare an alkali-activated Pisha sandstone composite cementitious material suitable for the building exterior wall insulation mortar.The effects of Pisha sandstone content on the fluidity,mechanical properties,and microstructure of the material were systematically investigated,and SEM was used to analyze the structural evolution of hydration products.The results showed that as the Pisha sandstone content increased,the fluidity of the material first increased and then decreased,reaching a peak(194 mm)at a content of 50%,while the mechanical properties gradually declined.When the Pisha sandstone content was 33%,the 28-day compressive strength could still reach 61.2 MPa.Microscopic analysis revealed that the introduction of Pisha sandstone promoted the formation of gel products such as C-S-H and N-A-S-H,but excessive incorporation led to insufficient active components and a loose structure.The engineering validation demonstrated that insulation mortar with a 30%Pisha sandstone substitution rate achieved a 28-day compressive strength of 38.7 MPa and a thermal conductivity of 0.32 W/(m·K).Its thermal insulation performance was superior to that of the traditional mortar,and the cost was reduced by 21.8%.This study provides a theoretical basis and technical support for the resource application of Pisha sandstone in building energy-saving engineering.关键词
砒砂岩/碱激发/胶凝材料/力学性能/水化机制/保温砂浆Key words
Pisha sandstone/alkali activation/cementitious material/mechanical properties/hydration mechanism/thermal insulation mortar分类
建筑与水利引用本文复制引用
庄妍,董晶亮,李亮华,姚道金,张友华,朱泽文..碱激发砒砂岩复合胶凝材料在建筑墙体保温系统中的应用技术研究[J].城市建筑,2025,22(22):208-212,5.基金项目
江西省重点研发计划项目"具有热反射功能的固废基建筑外墙饰面板关键技术研发"(20202BBGL73079) （20202BBGL73079）
