三乙醇胺和硬脂酸锌对泡沫混凝土性能的影响

摘要/Abstract

摘要： 为解决泡沫混凝土存在的高吸水率问题,本文研究了三乙醇胺(TEA)和硬脂酸锌(ZS)对泡沫混凝土孔隙特征、力学性能和防水性能的影响,同时结合接触角测试仪、扫描电子显微镜-能谱仪和X射线衍射仪等微观分析手段,研究了TEA和ZS对泡沫混凝土的改性机理。结果表明,加入1.6%(质量分数)TEA和0.4%(质量分数)ZS可以增大泡沫混凝土直径小于500 μm孔隙的占比,使泡沫混凝土28 d抗压强度提升到1.66 MPa。加入0.4%(质量分数)TEA和1.6%(质量分数)ZS能够将泡沫混凝土1、2、3 d吸水率降至2.8%、7.9%和10.5%,接触角最高达134.9°,使泡沫混凝土表面呈现疏水特征。TEA和ZS复掺能够增强泡沫在固化水泥浆体中的稳定性,细化孔隙结构,减少连通孔数量,提升泡沫混凝土的力学性能和防水性能。

关键词: 泡沫混凝土, 三乙醇胺, 硬脂酸锌, 孔隙结构, 力学性能, 防水性能

Abstract: In order to solve the long-standing problem of high water absorption of foam concrete, the effects of triethanolamine (TEA) and zinc stearate (ZS)on the pore characteristic, mechanical property and waterproof performance of foam concrete were studied. And the modification mechanism of TEA and ZS on foam concrete was studied by contact angle test, scanning electron microscopy with energy spectroscopy and X-ray diffractometer test methods. The results show that the addition of 1.6% (mass fraction) TEA and 0.4% (mass fraction) ZS can increase the proportion of pores with a diameter of less than 500 μm, and increase 28 d compressive strength of foam concrete to 1.66 MPa. The addition of 0.4% (mass fraction) TEA and 1.6% (mass fraction) ZS can reduce the water absorption of foam concrete to 2.8%, 7.9% and 10.5% at 1, 2, 3 d, and the contact angle reaches up to 134.9°, so that the foam concrete has a hydrophobic surface. The co-doping of TEA and ZS can enhance the stability of foam in the solidified cement slurry, refine the pore structure, reduce the number of connecting pores and improve the mechanical property and waterproof performance of foam concrete.

Key words: foam concrete, triethanolamine, zinc stearate, pore structure, mechanical property, waterproof performance

中图分类号:

TU528

李兆睿, 王振军, 张海宝, 张亚明, 张松林, 张博伦. 三乙醇胺和硬脂酸锌对泡沫混凝土性能的影响[J]. 硅酸盐通报, 2024, 43(3): 793-805.

LI Zhaorui, WANG Zhenjun, ZHANG Haibao, ZHANG Yaming, ZHANG Songlin, ZHANG Bolun. Effects of Triethanolamine and Zinc Stearate on Properties of Foam Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(3): 793-805.

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