碳化钢渣砖的制备及其微观性能研究  

Research on the Preparation and Microstructural Performance of Carbonated Steel Slag Bricks

作　　者：张晓翔 汪鹏 邓加鑫 顾磊 袁慧慧 韩双 ZHANG Xiaoxiang;WANG Peng;DENG Jiaxin;GU Lei;YUAN Huihui;HAN Shuang(Jiangsu Nigao Science and Technology Co.,Ltd.,Changzhou 213141,China;Changzhou Architectural Research Institute Group Co.,Ltd.,Changzhou 213015,China)

机构地区：[1]江苏尼高科技有限公司,江苏常州213141 [2]常州市建筑科学研究院集团股份有限公司,江苏常州213015

出　　处：《绿色建筑》2025年第1期158-168,共11页Green Building

基　　金：常州市科技计划(科技支撑-社会发展)“基于CCUS(碳捕集、利用与封存)技术的绿色低碳混凝土模壳的研发与应用”(CE20235033);江苏省创新能力建设计划“碳达峰、碳中和”科技创新专项资金“江苏省建材与建筑碳排放核算与监测技术公共服务平台建设”(BM2022035)。

摘　　要：以钢渣和石英砂为原料,采用碳化技术生产钢渣砖在提高钢渣利用率方面具有显著潜力。探讨了水胶比、胶砂比和成型压力对碳化钢渣砖抗压强度的影响,并采用压泵法(MIP)、X射线衍射(XRD)、热重分析法(TGA)等表征方法分析了孔结构、矿物组成和微观形貌。同时,通过生命周期评估(LCA)进一步评估了碳化钢渣砖的环境影响。抗压强度结果显示,水胶比和胶砂比显著影响钢渣砖的碳化效果,而成型压力的影响则相对较小,钢渣净浆体系和低胶砂比体系会降低钢渣砖的碳化效率和机械性能。编号为WB20的样品的LCA结果显示,其碳足迹比混凝土砖低81.41%,比烧结砖低85.02%。WB20的全球变暖潜力(GWP)分别比其自身、混凝土砖和烧结砖低84.61%、115.7%和112.7%。与传统的混凝土砖和烧结砖相比,碳化钢渣砖表现出卓越的物理性能,可作为一种具有前景的负碳建筑材料。Utilizing steel slag and quartz sand as raw materials,the production of steel slag bricks via carbonation technology demonstrates significant potential for improving steel slag utilization rates.This study investigates the effects of water-to-binder ratio(w/b),binder-to-sand ratio(b/s),and molding pressure on the compressive strength of carbonated steel slag bricks.Pore structure,mineral composition,and microstructural morphology were analyzed using mercury intrusion porosimetry(MIP),X-ray diffraction(XRD),and thermogravimetric analysis(TGA).Additionally,a life cycle assessment(LCA)was conducted to evaluate the environmental impact of carbonated steel slag bricks.The compressive strength results indicate that w/b and b/s ratios significantly influence the carbonation efficiency of steel slag bricks,whereas the impact of molding pressure is relatively minor.Systems with pure steel slag paste and low b/s ratios were found to decrease carbonation efficiency and mechanical properties.The LCA results for WB20 reveal that its carbon footprint is 81.41%lower than that of concrete bricks and 85.02%lower than that of fired bricks.Moreover,the global warming potential(GWP)of WB20 is 84.61%,115.7%,and 112.7%lower than that of its own carbon footprint,concrete bricks,and fired bricks,respectively.Compared to traditional concrete and fired bricks,carbonated steel slag bricks exhibit superior physical properties,making them as promising carbon-negative building material.

关 键 词：碳化 钢渣砖 抗压强度 体积安定性 孔隙率 生命周期评价 

分 类 号：TU522.17[建筑科学—建筑技术科学]