碳化养护对掺电石渣水泥石性能的影响
Effect of carbonation curing on the performance of cement paste added with carbide slag
秦玲 1毛星泰 2谢期劼 2崔祎菲 2鲍玖文 2陈铁锋 3高小建 3张鹏2
作者信息
- 1. 青岛理工大学 土木工程学院,青岛 266525;西安建筑科技大学 土木工程博士后科研流动站,西安 710055;青岛青建新型材料集团有限公司,青岛 266108
- 2. 青岛理工大学 土木工程学院,青岛 266525
- 3. 哈尔滨工业大学 土木工程学院,哈尔滨 150090
- 折叠
摘要
为降低水泥行业的碳足迹同时回收利用电石渣,本文将电石渣作为掺合料加入碳化养护水泥中,研究了碳化养护对掺电石渣水泥石抗压强度、干燥收缩、氯离子渗透等性能的影响,并利用X射线衍射、热分析、压汞法、扫描电镜等测试手段对水泥石的微观结构进行了分析.结果表明:碳化养护提高了掺电石渣水泥石的抗压强度及抗氯离子侵蚀性能,使其电通量降低了 38.17%～50.08%,56天干燥收缩率降低了8.8%～25.2%,细化了其孔结构.在保证水泥石强度不降低的前提下,约 10%的电石渣可以被资源化利用,同时水泥石的固碳率可达 11.19%～15.87%.利用碳化养护达到了捕捉固化二氧化碳、资源化利用电石渣、提升水泥石性能的目的.
Abstract
In order to reduce the carbon footprint of cement industry and recycle carbide slag,carbide slag was added into carbonation curing cement as the mineral admixture.The influence of carbonation curing on the com-pressive strength,drying shrinkage,chloride ion penetration of cement paste added with carbide slag was studied,and the microstructure of cement paste was analyzed by X-ray diffraction,thermal analysis,mercury intrusion porosimetry,scanning electron microscopy,etc.The results show that carbonation curing can improve the com-pressive strength and chloride ion erosion resistance of cement paste added with carbide slag,reduce the electric flux by 38.17%-50.08%,reduce the 56 days drying shrinkage by 8.8%-25.2%,and refine the pore structure.About 10%of carbide slag can be used as resource under the premise that the strength of cement paste is not reduced,and the carbon fixation rate of cement paste can reach 11.19%-15.87%.The purpose of capturing and solidifying carbon dioxide,recycling carbide slag and improving the performance of cement paste are achieved by carbonation curing.
关键词
电石渣/水泥基材料/碳化养护/抗压强度/微观结构Key words
carbide slag/cement-based materials/carbonation curing/compressive strength/micro-structure引用本文复制引用
基金项目
国家重点研发计划项目(2021YFB2600704)
国家自然科学基金(52208260)
山东省自然科学基金(ZR2022QE002)
出版年
2024
NETL
NSTL
万方数据