料浆流变性能对地质聚合物泡沫混凝土成孔机理的影响
Influence of rheological property of slurry on pore forming mechanism of geopolymer foamed concrete
关键词：
地质聚合物泡沫混凝土；流变性能；泡沫；成孔机理；气孔结构
Key words：
Geopolymer foamed concrete; Rheological property; Foam; Pore forming mechanism; Pore structure
刊期：
2025年第8期
DOI：
10.19761/j.1000-4637.2025.08.095.05
文章编号：
基金项目：
中国电建集团贵阳勘测设计研究院有限公司科研项目（YJ2023-01）。
作者：
童 胜1，王成云1，胡爽子1，王 莹2，翟鹏昊3，徐 方3，*
单位：
1.中国电建集团贵阳勘测设计研究院有限公司，贵州 贵阳 550081；2.中南勘察设计院集团有限公司，湖北 武汉 430073；3.中国地质大学（武汉） 工程学院，湖北 武汉 430074
摘要
摘 要：设计制备了不同水固比（0.28~0.42）地质聚合物泡沫混凝土，分析了不同流变性能料浆中泡沫的受力性能和气孔结构特征，揭示了地质聚合物泡沫混凝土的成孔机理。结果表明：随着水固比的增加，净浆的初始和最终极限剪切应力均减小；泡沫在浆体内主要受到浆体黏滞产生的挤压力、浆体流动产生的浮力、泡沫液膜泌水产生的泌水力和泡沫与浆体之间的摩擦力作用；随着净浆极限剪切应力的减小，地质聚合物泡沫混凝土的孔径分层现象加剧，各层的泡沫平均Feret直径和孔隙率差异越来越大。
Abstract: Geopolymer foamed concrete with different water-solid ratio(0.28~0.42) was designed and prepared. The mechanical properties and pore structure characteristics of foam in slurry with various rheological properties were analyzed, and the pore forming mechanism of geopolymer foamed concrete was revealed. The results indicate that as the water-solid ratio increases, the initial ultimate shear stress and final ultimate shear stress of the slurry decrease. The foam in the slurry is mainly affected by the squeezing force generated by the slurry viscosity, the buoyancy generated by the slurry flow, the bleeding generated by the bleeding of the foam liquid film, and the friction between the foam and the slurry. With the decrease of the ultimate shear stress of slurry, the pore size stratification of geopolymer foamed concrete intensifies, and the average Feret diameter of foam and porosity in each layer are more and more different.
结论
（1）随着水固比的增加，净浆的极限剪切应力随时间的增长速度逐渐变缓，且初始和最终极限剪切应力均逐渐减小。
（2）泡沫在浆体内主要受到浆体黏滞产生的挤压力Fc、浆体流动产生的浮力Fb、泡沫液膜泌水产生的泌水力Fd和泡沫与浆体之间的摩擦力Ff这4个外力作用，由于Fc为环向力，所引起的合外力为0，故浆体内泡沫的迁移主要受Fb、Fd和Ff影响。
（3）随着净浆极限剪切应力的降低，地质聚合物泡沫混凝土上层的泡沫平均Feret直径和孔隙率均增大，中、下层的泡沫平均Feret直径和孔隙率基本呈先增大后减小的趋势，孔径分层现象明显，从上往下的泡沫平均Feret直径和孔隙率越来越小。
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引用本文
童胜,王成云,胡爽子,等.料浆流变性能对地质聚合物泡沫混凝土成孔机理的影响[J].混凝土与水泥制品,2025(8):95-99.
TONG S,WANG C Y,HU S Z,et al.Influence of rheological property of slurry on pore forming mechanism of geopolymer foamed concrete[J].China Concrete and Cement Products,2025(8):95-99.
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