Relative humidity evolution in recycled aggregate concrete with glazed hollow beads internal curing: Self-desiccation and moisture diffusion

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Construction and Building Materials Pub Date : 2025-04-04 DOI:10.1016/j.conbuildmat.2025.141162

Xianxing Wang , Wenjing Wang , Yuxuan Li , Li Wang , Pengfei Duan , Yuanzhen Liu

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Abstract

Internal relative humidity plays a critical role in the durability of recycled aggregate concrete (RAC), particularly under self-desiccation and moisture diffusion conditions. This study investigates the internal humidity evolution of RAC incorporating glazed hollow beads (GHB) as an internal curing agent. Experimental results demonstrate that the water absorption and release properties of GHB effectively enhance internal curing, regulate humidity loss at different depths, and mitigate the effects of self-desiccation and moisture diffusion. The relationship between GHB content and the internal humidity gradient in RAC was established. Furthermore, a quantitative assessment of self-desiccation and moisture diffusion revealed that moisture diffusion primarily drives humidity reduction at shallow depths, while self-desiccation has a greater influence at greater depths. Comparisons with other internal curing materials highlight the superior long-term moisture regulation effects of GHB under low dosages. The findings provide valuable insights into moisture regulation mechanisms and offer guidance for designing more durable and sustainable concrete.

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釉面空心微珠内养护再生骨料混凝土的相对湿度演变：自干和水分扩散

内部相对湿度对再生骨料混凝土（RAC）的耐久性起着至关重要的作用，特别是在自干和水分扩散条件下。研究了以釉面空心微珠（GHB）为内固化剂的RAC的内部湿度变化规律。实验结果表明，GHB的吸水和释水特性可以有效地增强内部固化，调节不同深度的湿度损失，减轻自干和水分扩散的影响。建立了温室气体（GHB）含量与室内湿度梯度的关系。此外，自干燥和水分扩散的定量评估表明，水分扩散主要驱动浅深度的湿度减少，而自干燥在更深的深度有更大的影响。与其他内固化材料相比，GHB在低剂量下具有较好的长期调湿效果。这些发现为水分调节机制提供了有价值的见解，并为设计更耐用和可持续的混凝土提供了指导。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.