工业固废粉末对自密实高性能混凝土性能的影响

摘要/Abstract

摘要： 为研究不同工业固废粉末对自密实高性能混凝土力学性能和耐久性的影响机理,对掺入不同比例粉煤灰、矿渣、石灰粉末、煤矸石粉末和大理石粉末的混凝土进行了试验研究。通过测试混凝土的坍落扩展度、T50流动时间、L型仪和V型仪流动时间来评估其施工性能,通过测试混凝土超声波波速和抗压强度来分析其力学性能,通过测试混凝土通电量和水渗透深度来表征其耐久性。结果表明:粉煤灰、矿渣、石灰粉末、煤矸石粉末及大理石粉末可用于配制施工性能和耐久性均佳的自密实高性能混凝土;粉煤灰和矿渣粉末的允许掺量分别为35%(质量分数,下同)和60%,煤矸石、石灰粉末和大理石粉末的允许掺量各为30%,粉煤灰的添加有利于提高混凝土的流动性,使其坍落扩展度最大可达到750 mm;除石灰粉末外,增加工业固废粉末掺量也可提高混凝土抗氯离子渗透性能,但增加细粉的掺量会降低混凝土的抗渗性能和抗压强度,其中,掺入30%石灰粉末的混凝土抗压强度下降最明显,降幅达到20.8%。

关键词: 自密实高性能混凝土, 工业固废粉末, 力学性能, 施工性能, 耐久性

Abstract: In order to investigate the influence mechanism of various industrial solid waste powders on the mechanical properties and durability of high-performance self-compacting concrete (HPSCC), an experimental investigation was conducted on the concrete with various mass fraction of fly ash, furnace slag, lime powder, coal gangue powder and marble powder. The slump flow, T50 flow time, L-box and V-funnel flow time were experimentally measured to evaluate the workability of HPSCC. The concrete mechanical properties were evaluated by measuring ultrasonic pulse velocity and compressive strength. In addition, the power consumption and water penetration depth were tested to characterize its durability. The results show that fly ash, furnace slag, lime powder, coal gangue powder and marble powder can be used to prepare HPSCC with excellent workability and durability. The allowable mass fraction of fly ash and furnace slag powder is 35% and 60%, respectively. While, the allowable mass fraction for coal gangue powder, lime powder and marble powder is 30%, respectively. The addition of fly ash significantly improves the concrete workability, with a maximum slump flow of 750 mm. Except for lime powder, the increase of other industrial solid waste powders leads to a better concrete anti-chloride ion permeability. However, the increase of industrial solid waste powders can reduce the impermeability and compressive strength of concrete. The concrete mixed with 30% lime powder shows the largest decrease in compressive strength, with a reduction of 20.8%.

Key words: high-performance self-compacting concrete, industrial solid waste powder, mechanical property, workability, durability

中图分类号:

TU528

何翔, 乔险涛, 喻鹏, 周佳乐, 牛建东. 工业固废粉末对自密实高性能混凝土性能的影响[J]. 硅酸盐通报, 2023, 42(11): 4017-4026.

HE Xiang, QIAO Xiantao, YU Peng, ZHOU Jiale, NIU Jiandong. Effects of Industrial Solid Waste Powders on Performance of High-Performance Self-Compacting Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(11): 4017-4026.

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