含气富白石水泥混凝土中气泡的产生与稳定

IF 13.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-09-06 DOI:10.1016/j.cemconcomp.2025.106325

Jing Xie , Xuanhan Zhang , Xiang Hu , Zemei Wu , Caijun Shi

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引用次数: 0

摘要

在以高C2S/低C3A为特征的富白石水泥（BRC）体系中，引气剂（AEAs）的引气和稳泡机制尚不清楚。本研究对不同离子类型的AEAs在BRC和硅酸盐水泥（PC）混凝土中的气泡生成和稳定化行为进行了对比研究。通过综合表征，包括离子组成分析、表面张力测量、Zeta电位测试、流变性能评估和气泡壳的化学成分分析，探索了控制气泡动力学的潜在机制。结果表明，与PC混凝土相比，AEAs在BRC中的气泡生成效率较低。这种现象主要是由于BRC中较低的Na+/K+浓度、离子强度和粘度，以及较高的SO42-/早期Ca2+浓度。此外，加入离子AEAs的硬化BRC混凝土的气孔间距系数低于PC，这可能是由于BRC体系的表面张力较低，气泡/AEAs -水泥颗粒的相互作用较弱。

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Generation and stabilization of air bubbles in air-entrained belite-rich cement concrete

The air-entraining and bubble-stabilizing mechanisms of air-entraining agents (AEAs) in belite-rich cement (BRC) systems characterized by high C₂S/low C₃A remain unclear. This study conducted a comparative investigation on the bubble generation and stabilization behaviors of AEAs with different ionic types in BRC and portland cement (PC) concretes. The underlying mechanisms governing bubble dynamics were explored through comprehensive characterizations, including ionic composition analysis, surface tension measurements, Zeta potential tests, rheological property evaluations, and the chemical composition analysis of bubble shells. Results show that compared with PC concrete, AEAs exhibited lower bubble generation efficiency in BRC. This phenomenon is primarily driven by the lower Na⁺/K⁺ concentrations, ionic strength, and viscosity, as well as the higher SO₄²⁻/early-stage Ca²⁺ concentrations in BRC. Additionally, the air-void spacing factor in hardened BRC concrete with ionic AEAs was lower than that of PC, which can be attributed to the lower surface tension, and weaker bubble/AEAs - cement particle interaction in BRC system.

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来源期刊

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.