Air entrapment and reaction with absorbed liquids on the absorption of aerated concrete

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-02-11 DOI:10.1016/j.cemconres.2025.107824

Kazuma Fukui, Saya Kobayashi, Satoru Takada

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引用次数: 0

Abstract

Aerated concrete exhibits anomalous water transport, similar to mortar and concrete. Several factors, including water sensitivity, air entrapment, and gravity, are considered to be the causes; however, they are currently not quantitatively understood. This study aimed to clarify the mechanisms underlying the anomalous absorption of aerated concrete through liquid absorption experiments and numerical simulations of liquid and air transfer. The experiments showed that, unlike mortar and concrete, aerated concrete exhibited decreasing absorption rates during the initial stage of absorption, even when organic liquids were absorbed. A comparison between the calculations of simultaneous air and liquid transfers and those of single-phase water transfer in a material revealed that increases in water content in the high-water-content region were significantly reduced by air-pressure buildup. Therefore, the water absorption of aerated concrete, which is characterized by coarse aerated pores, is sensitive to air entrapment in addition to the water sensitivity of the cement component.

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加气混凝土吸附过程中空气的夹持及与被吸收液体的反应

加气混凝土表现出异常的水输送，类似于砂浆和混凝土。几个因素，包括水敏感性、空气夹持和重力，被认为是原因；然而，它们目前还没有被定量地理解。本研究旨在通过液体吸收实验和液体和空气传递的数值模拟来阐明加气混凝土异常吸收的机制。实验表明，与砂浆和混凝土不同，加气混凝土在吸收初期的吸收率下降，即使在吸收有机液体的情况下也是如此。通过对空气和液体同时传递的计算结果与材料中单相水传递的计算结果的比较表明，在高含水区域，空气压力的增加显著降低了水含量的增加。因此，除水泥构件的水敏性外，以气孔粗为特征的加气混凝土的吸水率对截留空气也很敏感。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.