摘要
为实现CO_(2)矿化固定减排与多元固废综合利用的协同效应,在矿化养护条件下,以碱激发全固废制备的地聚物为对象,探究钙含量、水玻璃模数、碱胶比和水固比对抗压强度和固碳效果的影响,并通过XRD和SEM电镜对其矿物组成及微观形貌特性进行分析。结果表明:矿化养护条件下,地聚物的抗压强度随钙含量的增加而升高,随水玻璃模数和水固比的升高而降低,随碱胶比的升高,先增大后减小,且矿化反应基本在前7天内完成,固碳效果达到28 d的90%以上。从微观结构和化学分析得出,CO_(2)与地聚物的水化产物及少量碱性物质进行反应,生成大量的CaCO_(3),对消耗的C-S-H和C-H等物质进行填充,使微观结构更致密,矿化养护是助力实现碳中和的有效固碳方法。
In order to achieve the synergistic effect of CO_(2)mineralization,fixed emission reduction,and comprehensive utilization of multiple solid wastes,under mineralization and maintenance conditions,the effects of calcium content,water glass modulus,alkali binder ratio,and water solid ratio on compressive strength and carbon sequestration effect of geopolymers prepared from alkali activated total solid waste were investigated.The mineral composition and microscopic morphology characteristics were analyzed by XRD and SEM electron microscopy.The results show that under mineralized curing conditions,the compressive strength of the geopolymer increases with the increase of calcium content,decreases with the increase of water glass modulus and water solid ratio,increases first and then decreases with the increase of alkali cement ratio,and the mineralization reaction is basically completed within the first 7 days,with a carbon fixation effect of over 90%after 28 days.From microscopic and chemical analysis,it can be concluded that CO_(2)reacts with the hydration products of geopolymers and a small amount of alkaline substances to generate a large amount of CaCO_(3),which fills the consumed substances such as C-S-H and C-H,making the microstructure denser.Mineralization maintenance is an effective carbon sequestration method to help achieve carbon neutrality.
作者
王一晓
许耀群
林新昊
张昂
杨嫚嫚
WANG Yixiao;XU Yaoqun;LIN Xinhao;ZHANG Ang;YANG Manman(School of Civil Engineering,Zhongyuan Institute of Science and Technology,Zhengzhou 451400,China;School of Water Conservancy and Transportation,Zhengzhou University,Zhengzhou 450001,China;College of Continuing Education,Wuhan University,Wuhan 430072,China)
出处
《混凝土》
北大核心
2025年第5期56-61,共6页
Concrete
基金
河南省科技攻关项目(232102230129)
国家自然科学基金(52130901)
许昌市科技攻关项目(20230213059)。
关键词
CO_(2)矿化养护
多元固废
固碳率
地聚物
抗压强度
CO_(2)mineralization maintenance
multiple solid waste
carbon sequestration rate
geopolymer
compressive strength
