Transport kinetics of internal curing water from pumice in ultra-high performance concrete: The impact of ink-bottle pore size

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-09-29 DOI:10.1016/j.conbuildmat.2025.143839

Enlai Dong , Yong Leng , Lang Jin , Feixiang Chen , Yuan Feng , Rui Yu , Yamei Zhang

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Abstract

Self-desiccation shrinkage is one of the primary factors contributing to cracking in ultra-high-performance concrete (UHPC), and internal curing has been identified as a highly effective solution to mitigate this issue. The internal curing efficiency is closely linked to the pore size of internal curing material, particularly ink-bottle structure, which plays a crucial role in moisture retention and release. This study investigates how the pumice ink-bottle pore size affects moisture transmission kinetics in UHPC. Using low-field nuclear magnetic resonance, scanning electron microscopy, and nanoindentation, the impact of pore characteristics on the absorption-desorption behavior of internal curing water and its correlation with UHPC microstructural evolution were investigated. The results reveal that ink-bottle hysteresis effect is more pronounced in finer pumice, with the hysteresis index of 0–0.6 mm pumice increasing by 42 % compared to 0.6–1.23 mm pumice. Consequently, fine pumice exhibits a delayed water release time (by 1 h) and a lower water release rate, with 38 % less water being released over 24 h in UHPC. When fine pumice content reaches 20 %, it reduces autogenous shrinkage by 71 % and forms a hydration product gradient layer than 45 μm in the interface transition zone of UHPC, demonstrating a more effective internal curing effect. Absorption process in ink-bottle pores is driven by capillary forces and osmotic pressure, while cavitation occurs via bubble nucleation under low vapor pressure. A dynamic moisture transfer model based on vapor pressure theory confirms that smaller ink-bottle pores amplify hysteresis effects and thereby enhance the efficiency of internal curing.

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超高性能混凝土中浮石内部养护水的输运动力学：墨水瓶孔径的影响

自干收缩是导致高性能混凝土（UHPC）开裂的主要因素之一，内部养护已被确定为缓解这一问题的高效解决方案。内部固化效率与内部固化材料的孔径密切相关，尤其是墨瓶结构，它对水分的保持和释放起着至关重要的作用。本文研究了浮石墨瓶孔径对超高性能混凝土中水分传递动力学的影响。利用低场核磁共振、扫描电镜和纳米压痕技术，研究了孔隙特征对内部固化水吸附-解吸行为的影响及其与UHPC微观结构演变的相关性。结果表明，墨瓶迟滞效应在细粒浮石中更为明显，0-0.6 mm浮石的迟滞指数比0.6-1.23 mm浮石的迟滞指数提高了42 %；因此，细浮石表现出延迟水释放时间（1 h）和较低的水释放率，在UHPC中，在24 h内释放的水减少了38 %。细浮石掺量达到20 %时，自缩水率降低71 %，在UHPC界面过渡区形成大于45 μm的水化产物梯度层，内部固化效果更明显。墨水瓶孔隙中的吸附过程受毛细力和渗透压的驱动，而空化过程则在低蒸汽压下通过气泡成核发生。基于蒸汽压理论的动态水分传递模型证实，较小的墨瓶孔隙会放大迟滞效应，从而提高内固化效率。

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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.