固废生态混凝土的降碱技术研究
Research on the alkalinity reduction of solid waste eco-concrete
南书婷 1程霄智 2朱亚光 1徐培蓁 1毕雯惠1
作者信息
- 1. 青岛理工大学土木工程学院,青岛 266525
- 2. 中北大学环境与安全工程学院,太原 030003
- 折叠
摘要
固废生态混凝土的碱度决定了植物生长性,拟采取碳化钢渣、钢渣微粉、粉煤灰和脱硫石膏等多种固废材料制备生态混凝土,并通过碳化、喷涂硅烷、碳化和喷涂硅烷复合的3种方法降低固废生态混凝土碱度,分析不同降碱方法对固废生态混凝土抗压强度和碱度的影响.结果表明,碳化和喷涂硅烷都可以在一定程度上降低固废生态混凝土的碱度,小幅度提高混凝土的抗压强度;采用碳化降碱时,快速碳化的降碱效果优于自然碳化,且快速碳化7 d时混凝土的抗压强度和碱度最佳;采用喷涂硅烷降碱、喷涂2次时,抗压强度和碱度最佳.当固废生态混凝土快速碳化7 d后喷涂2次硅烷时降碱效果和抗压强度最优,pH值可降至9.3左右,抗压强度提高10％～20％.
Abstract
The alkalinity of solid waste eco-concrete plays a crucial role in determining plant growth.This study utilizes various solid waste materials to prepare eco-concrete,including carbonized steel slag,steel slag micropowder,fly ash and desulfurized gypsum.Three meth-ods are employed to reduce the alkalinity of solid waste eco-concrete:carbonation treatment,silicone spraying and a combination of carbonation treatment and silicone spraying.It then analyzes the effects of these three alkalinity reduction methods on the compressive strength and alkalinity of solid waste eco-concrete.The findings reveal that both carbonization treat-ment and silicone spraying can effectively reduce the alkalinity to some extent and slightly improve the concrete's compressive strength at the same time.When carbonization treat-ment is employed,rapid carbonization exhibits better results in terms of alkalinity reduction compared to natural carbonization,yielding optimal compressive strength and alkalinity lev-els during the 7-day rapid carbonization process.When silicone spraying is employed,two rounds of spraying results in superior compressive strength and alkalinity levels.Combining a 7-day rapid carbonization with two rounds of silicone spraying achieves the best results of reducing pH value to approximately 9.3 while increasing compressive strength by 10％～20％.
关键词
固废生态混凝土/降碱/抗压强度/碱度Key words
solid waste eco-concrete/alkalinity reduction/compressive strength/alkalinity引用本文复制引用
出版年
2024
NETL
NSTL
万方数据