Microstructure tailoring of internal curing agents: modified cement particles/superabsorbent polymers composites balancing strength and shrinkage mitigation

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

Cement and Concrete Research Pub Date : 2025-05-31 DOI:10.1016/j.cemconres.2025.107950

Yasen Li , Cheng Zhang , Yangyang Xiang , Yanru Chen , Tingzhong Li , Honghai Cui , Guoxing Sun

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引用次数: 0

Abstract

Superabsorbent polymers (SAPs) are widely studied as internal curing agents in high-performance concrete, but their adverse effects on pore structure remain a challenge. This study introduces an innovative cement-integrated SAP (CiSAP) by modifying the interface, using KH570-modified cement (KMC) as the functional core. By optimizing KMC content, the microstructure was improved, leading to enhanced performance. Structural characterization confirmed that KMC was successfully embedded into the polymer network. CiSAP30 reduced shrinkage by 61.4 % due to its excellent desorption efficiency. The 28-day strength retention of CiSAP in cement-based materials varied from 93.4 % to 99.6 %, compared to the reference group without CiSAP. MIP and fractal dimension analysis indicated that CiSAP refined the microstructure by reducing large capillary pores and filling macropores. The sustained water release from CiSAP, along with KMC hydration, promoted long-term densification and controlled autogenous shrinkage. This study provides a novel strategy for designing internal curing agents for high-performance cement-based materials.

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内部固化剂的微观结构定制：改性水泥颗粒/高吸水性聚合物复合材料平衡强度和收缩减缓

高吸水性聚合物（sap）作为高性能混凝土的内部固化剂被广泛研究，但其对孔隙结构的不利影响仍然是一个挑战。本研究以kh570改性水泥（KMC）为功能核心，通过修改界面，设计了一种新型水泥集成SAP （CiSAP）。通过优化KMC含量，改善了微结构，提高了性能。结构表征证实KMC成功嵌入到聚合物网络中。由于CiSAP30具有优异的脱附效率，其收缩率降低了61.4%。与不使用CiSAP的参照组相比，CiSAP在水泥基材料中的28天强度保持率从93.4%到99.6%不等。MIP和分形维数分析表明，CiSAP通过减少大毛细管孔隙和填充大孔隙来细化微观结构。CiSAP的持续水分释放，以及KMC的水化作用，促进了长期致密化，并控制了自收缩。本研究为高性能水泥基材料内部固化剂的设计提供了一种新的策略。

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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.