Novel high-efficiency solid particle foam stabilizer: Effects of modified fly ash on foam properties and foam concrete

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement & concrete composites Pub Date : 2024-10-24 DOI:10.1016/j.cemconcomp.2024.105818
Qiang Song , Yingjie Zou , Peng Zhang , Shipeng Xu , Yuxin Yang , Jiuwen Bao , Shanbin Xue , Jie Liu , Shujun Gao , Liang Lin
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Abstract

The preparation of foam concrete frequently encounters challenges such as foam collapse and stratification, which lead to a decline in material performance. Therefore, enhancing foam stability is paramount in the production of foam concrete. This study innovatively addresses this issue by investigating the use of waste fly ash particles (RFA) and modified fly ash (AMFA, BMFA, and CMFA) as foam stabilizers, and comparing their efficacy with that of traditional nano-silica stabilizers (NS), both independently and in combination. The results indicate that modified ultrafine fly ash particles (AMFA) exhibit foam stability properties (1-h settlement distance and bleeding rate) comparable to those of NS. Moreover, when combined with NS, the mixture surpasses the foam performance of NS alone. Utilizing these highly stable foams, lightweight foam concrete with a 600 kg/m³ density is produced, demonstrating exceptional mechanical properties (compressive strength of 3.42 MPa) and superior thermal insulation (thermal conductivity of 0.0914 W/m· K). The enhanced foam stability of the modified fly ash is primarily attributed to increased surface roughness, hydrogen bonding, and van der Waals forces. Developing highly stable foams holds significant potential, contributing to energy conservation, emissions reduction, and waste management.
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新型高效固体颗粒泡沫稳定剂:改性粉煤灰对泡沫性能和泡沫混凝土的影响
泡沫混凝土的制备经常会遇到泡沫坍塌和分层等难题,从而导致材料性能下降。因此,在泡沫混凝土生产过程中,提高泡沫稳定性至关重要。本研究创新性地解决了这一问题,研究了使用废弃粉煤灰颗粒(RFA)和改性粉煤灰(AMFA、BMFA 和 CMFA)作为泡沫稳定剂,并比较了它们与传统纳米二氧化硅稳定剂(NS)单独或组合使用时的功效。结果表明,改性超细粉煤灰颗粒(AMFA)的泡沫稳定性能(1 小时沉降距离和渗流率)与 NS 相当。此外,当与 NS 混合使用时,混合物的泡沫性能超过了单独使用 NS 时的性能。利用这些高度稳定的泡沫,可生产出密度为 600 kg/m³ 的轻质泡沫混凝土,并显示出优异的机械性能(抗压强度为 3.42 MPa)和卓越的隔热性能(导热系数为 0.0914 W/ m-K)。改性粉煤灰泡沫稳定性的增强主要归功于表面粗糙度、氢键和范德华力的增加。开发高度稳定的泡沫具有巨大潜力,有助于节能、减排和废物管理。
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来源期刊
Cement & concrete composites
Cement & concrete composites 工程技术-材料科学:复合
CiteScore
18.70
自引率
11.40%
发文量
459
审稿时长
65 days
期刊介绍: Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.
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