摘要
向泡沫混凝土中掺入微纳米成孔剂可构筑大量微纳米孔,有利于提升泡沫混凝土在温和条件下的固碳效能。为探究成孔剂的固相粒径对泡沫混凝土的固碳效能和基本性能的影响,利用含不同粒径固相的微纳米成孔剂取代泡沫,制备出富微纳米孔的泡沫混凝土,通过气孔结构分析、压汞法分析、固碳率测试、抗压强度及导热系数测定,探究成孔剂固相粒径对泡沫混凝土孔结构及固碳效能、力学、保温性能的影响。结果表明,随着成孔剂固相粒径由10 nm增至100 nm;不同密度等级试样充分碳化时间延长了66.7%~166.7%,实际固碳率降低至25.7%~31.2%,28 d抗压强度增加了39.2%~76.0%,导热系数增加了3.2%~12.9%。试样碳化后抗压强度均有所降低、导热系数均有所回升。
Adding micro-size or nano-size pore-forming agent into foamed concrete can create a large number of micro/nano pores,which was conducive to enhancing the CO_(2) sequestration efficiency of foamed concrete under mild conditions.To explore the influence of the solid particle size of pore-forming agents on the CO_(2) sequestration efficiency and basic properties of foamed concrete,the foamed concrete with rich micro/nano pores was prepared by using micro-size or nano-size pore-forming agent containing solid phases of different particle sizes to replace foam.Through pore structure analysis,mercury intrusion porosimetry analysis,CO_(2) sequestration rate testing,compressive strength and thermal conductivity measurement,the influence of the particle size of the solid phase of the pore-forming agent on the pore structure,CO_(2) sequestration efficiency,mechanical properties and thermal insulation performance of foamed concrete was investigated.The results showed that the carbonation time of the samples of different density grades increased from 66.7%to 166.7%,the actual CO_(2) sequestration rate decreased from 25.7%to 31.2%,the compressive strength increased from 39.2%to 76.0%,and the thermal conductivity increased from 3.2%to 12.9%,as the solid particle size of the pore-forming agent increased from 10 nm to 100 nm.After carbonation,the compressive strength of all samples decreased and the thermal conductivity increased.
作者
王鸿
曾浩伦
朱永娇
蒋俊
罗凯
吕淑珍
Wang Hong;Zhu Yongjiao;Zeng Haolun;Jiang Jun;Luo Kai;Lv Shuzhen(State Key Laboratory for Environment-Friendly Energy Materials,Southwest University of Science and Technology,Mianyang,Sichuan 621010;School of Materials and Chemistry,Southwest University of Science and Technology,Mianyang,Sichuan 621010)
出处
《非金属矿》
2025年第6期6-10,16,共6页
Non-Metallic Mines
基金
拉萨市科技计划项目(LSKJ202632)
四川省科技计划项目(2023YFG0379)
中央引导地方科技发展专项(24ZYCXCP0040)。
关键词
固相粒径
微纳米成孔剂
泡沫混凝土
固碳效能
保温性能
solid phase particle size
micro-size or nano-size pore-forming agent
foamed concrete
CO_(2)sequestration efficiency
thermal insulation performance
