超高性能碱激发混凝土的性能及环境影响研究

doi:10.16552/j.cnki.issn1001-1625.2024.1513

摘要/Abstract

摘要： 为降低超高性能混凝土(UHPC)生产过程中产生的碳排放和能耗,本文以碱激发矿渣材料替代传统硅酸盐水泥制备了超高性能碱激发混凝土(UHPAAC),研究水玻璃模数(1.1、1.3、1.5)和碱当量(6%、7%、8%,质量分数)对UHPAAC的工作性能、力学性能和耐久性能的影响,并分析了产生的环境效益。结果表明,适当地提高水玻璃模数和碱当量可以细化UHPAAC的孔隙结构,提升各项性能。UHPAAC凝结硬化较快,流动性低于UHPC。UHPAAC早期强度高,标准养护7 d抗压强度均超过了100 MPa,且达到了28 d抗压强度的80.2%~92.4%。UHPAAC的毛细吸水质量和吸水率明显高于UHPC,但抗氯离子渗透性能优于UHPC,而且实验室加速条件下碳化28 d后碳化深度均为0 mm。此外,UHPAAC可以显著降低碳排放和能耗。本研究认为,当碱激发剂中水玻璃模数为1.5、碱当量为6%时,UHPAAC的综合性能最优,环境影响最小。

关键词: 超高性能碱激发混凝土, 工作性能, 抗压强度, 耐久性能, 环境影响, 固废利用

Abstract: In order to reduce the carbon emission and embodied energy consumption in the production process of ultra-high performance concrete (UHPC), ultra-high performance alkali-activated concrete (UHPAAC) was prepared by replacing traditional Portland cement with alkali-activated slag materials, and the effects of sodium silicate modulus (1.1, 1.3, 1.5) and alkali equivalent (6%, 7%, 8%, mass fraction) on the workability, mechanical performance and durability performance of UHPAAC were studied, and the environmental benefits were analyzed. The results show that the pore structure of UHPAAC can be refined by appropriately increasing the sodium silicate modulus and alkali equivalent, and the properties of UHPAAC can be improved. UHPAAC has a faster coagulation hardening and lower fluidity than UHPC. UHPAAC has high early strength, and the compressive strength of standard curing 7 d exceeds 100 MPa, and reaches 80.2%~92.4% of the compressive strength of 28 d. The capillary water absorption mass and water absorption of UHPAAC are significantly higher than those of UHPC, but the chloride ion permeation resistance is better than that of UHPC, and the carbonization depth is 0 mm after 28 d of carbonization under accelerated laboratory conditions. In addition, UHPAAC can significantly reduce carbon emission and embodied energy consumption. This study indicates that when the sodium silicate modulus is 1.5 and the alkali equivalent is 6%, the comprehensive performance of UHPAAC is optimal and its environmental impact is minimal.

Key words: ultra-high performance alkali-activated concrete, workability, compressive strength, durability performance, environmental impact, utilization of solid waste

中图分类号:

TU528

崔祎菲, 刘梦华, 张益聪, 艾威侠, 徐诺. 超高性能碱激发混凝土的性能及环境影响研究[J]. 硅酸盐通报, 2025, 44(5): 1689-1702.

CUI Yifei, LIU Menghua, ZHANG Yicong, AI Weixia, XU Nuo. Performance and Environmental Impact of Ultra-High Performance Alkali-Activated Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(5): 1689-1702.

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