微纳米气泡水对喷射混凝土性能的影响

摘要/Abstract

摘要： 微纳米气泡水(MNBW)具有比表面积大、稳定性好以及水分子活性高等特点,将其用于拌和喷射混凝土可提高喷射混凝土的物理力学性能。选用MNBW作为拌合水,研究了MNBW气泡气体类型、MNBW剪切时间、MNBW含量和无碱液体速凝剂掺量对水泥净浆凝结时间和水泥砂浆力学性能的影响,并采用数字图像采集技术探究了水泥砂浆在单轴压缩过程中界面裂缝的扩展规律。结果表明:MNBW(特别是含CO₂气泡的MNBW)可以明显促进水泥水化反应,缩短水泥净浆凝结时间;水泥砂浆的抗压强度和抗折强度均随MNBW含量和养护龄期的增加而增大,随MNBW剪切时间增加呈先增大后减小的变化规律。在单轴压缩破坏过程中,不同拌合水试件初始裂缝萌生所需载荷值从大到小依次为CO₂气泡MNBW组、空气气泡MNBW组、自来水组。

关键词: 喷射混凝土, 微纳米气泡水, 无碱液体速凝剂, 凝结时间, 力学性能, 裂缝

Abstract: Micro-nano bubble water (MNBW) has the characteristics of large specific surface area, good stability and high activity of water molecules. MNBW can be used to mix shotcrete to improve the physical and mechanical properties of shotcrete. MNBW was selected as the mixing water, and the effects of MNBW bubble gas type, MNBW shear time, MNBW content and alkali-free liquid accelerator content on the setting time of cement paste and the mechanical properties of cement mortar were studied. The digital image acquisition technology was used to explore the interface crack propagation law of cement mortar during uniaxial compression. The results show that MNBW (especially MNBW containing CO₂ bubbles) can significantly promote the hydration reaction of cement and shorten the setting time of cement paste. The compressive strength and flexural strength of cement mortar increase with the increase of MNBW content and curing age, and increase first and then decrease with the increase of MNBW shear time. In the process of uniaxial compression failure, the load value required for the initial crack initiation of different mixed water specimens from large to small is CO₂ bubble MNBW group, air bubble MNBW group, and tap water group.

Key words: shotcrete, micro-nano bubble water, alkali-free liquid accelerator, setting time, mechanical property, crack

中图分类号:

TU528.1

成丽华, 杜航, 杨永浩, 闫国光, 周坤, 唐爽, 付天保. 微纳米气泡水对喷射混凝土性能的影响[J]. 硅酸盐通报, 2024, 43(12): 4378-4388.

CHENG Lihua, DU Hang, YANG Yonghao, YAN Guoguang, ZHOU Kun, TANG Shuang, FU Tianbao. Effect of Micro-Nano Bubble Water on Performance of Shotcrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(12): 4378-4388.

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