Advanced moisture control in porous aggregates for improved lightweight high-performance concrete

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2024-10-28 DOI:10.1016/j.cemconcomp.2024.105826

Ying Wei , Ziwei Chen , Marcus Yio , Christopher Cheeseman , Hailong Wang , Chi Sun Poon

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引用次数: 0

Abstract

The porous lightweight aggregates in concrete experience a process of water absorption and desorption. This study aims to improve the performance of water-sensitive low water/binder (w/b) systems by effectively utilizing these water regulations. The effects of expanded shale (ES) substitutions and saturation levels (dry, half saturation, and saturation) on the fresh and hardened properties of mixtures with a w/b of 0.18 were investigated. The results indicated that, during the fresh stage, water absorption reduced workability and shortened the setting time. In the hardening stage, the released water improved hydration, increased internal relative humidity, and caused volumetric expansion, which reduced autogenous shrinkage. A comprehensive evaluation revealed that the optimal condition for ES was half-saturation with 4.0 wt% pre-absorbed water. This condition achieved the best internal curing effect, improved workability, and optimal structural efficiency (strength/density). This study provides practical insights for the effective integration of porous aggregates in the mixture design and engineering applications.

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在多孔骨料中采用先进的水分控制技术，改善轻质高性能混凝土的性能

混凝土中的多孔轻质骨料会经历一个吸水和解吸的过程。本研究旨在通过有效利用这些水规定，改善对水敏感的低水/粘结剂（w/b）体系的性能。研究了膨胀页岩（ES）替代物和饱和度（干燥、半饱和和饱和）对水胶比为 0.18 的混合物新鲜和硬化性能的影响。结果表明，在新鲜阶段，吸水性降低了可操作性并缩短了凝结时间。在硬化阶段，释放的水改善了水合作用，增加了内部相对湿度，并导致体积膨胀，从而减少了自生收缩。综合评估结果表明，ES 的最佳条件是半饱和状态，预吸水率为 4.0 wt.%。在这种条件下，内部固化效果最佳，施工性更好，结构效率（强度/密度）最优。这项研究为在混合料设计和工程应用中有效整合多孔集料提供了实用见解。

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 & 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.