Systematic study on mix design optimization and on fresh properties of grouts containing crystalline admixtures

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2025-03-14 DOI:10.1617/s11527-025-02598-w

Suelen da Rocha Gomes, Isabel Santacruz, Luis Sánchez, Mercedes Sánchez Moreno

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引用次数: 0

Abstract

Crystalline admixtures (CA) are often proposed as admixtures for improving self-healing ability of cement-based materials. While significant progress has been made in smart concretes and mortars, the application of self-healing technology in grouts remains underexplored. The design of a grout is complex because any change in its composition will have a significant effect on its properties, especially in the fresh state. This work analyses the effect of the incorporation of the CA on the production of a self-repairing grout. The study focuses on the effects of CA on the fresh and hardened properties of grouts. A comprehensive analysis of grout design highlights the influence of critical parameters such as water/binder (w/b) and sand/binder (s/b) ratios, supplementary materials (fly ash and limestone), and superplasticizer (SP) dosages. Formulating a grout with CA requires greater efforts to achieve an optimal balance between the fresh and hardened properties. CA affected particle dispersion, stability and consistency of grouts. Designing grouts (with and without CA) with similar fluidity required higher SP dosages, which improved the viscosity and delayed the setting time. CA accelerates the hydration of C₃S and C₃A hydrates formation and shortens the induction period, but when combined with SP, its contribution is reduced. Compressive strength of grout with CA were higher than reference at all tested ages.

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系统研究了含结晶掺合料浆料的配合比优化及新鲜性能

晶体掺合料（CA）常被提出作为提高水泥基材料自愈能力的掺合料。虽然在智能混凝土和砂浆方面取得了重大进展，但自修复技术在灌浆中的应用仍未得到充分探索。浆液的设计是复杂的，因为其成分的任何变化都会对其性能产生重大影响，特别是在新鲜状态下。本文分析了CA的掺入对自修复浆液生产的影响。研究了CA对浆料新鲜和硬化特性的影响。对注浆设计的综合分析强调了关键参数的影响，如水/粘结剂（w/b）和砂/粘结剂（s/b）比、补充材料（粉煤灰和石灰石）和高效减水剂（SP）用量。配制含CA的浆液需要更大的努力来达到新鲜和硬化性能之间的最佳平衡。CA对浆料颗粒分散性、稳定性和稠度有影响。设计具有相似流动性的浆液（含和不含CA）需要更高的SP剂量，这可以提高粘度并延迟凝结时间。CA加速了C3S和C3A水合物的水化形成，缩短了诱导期，但与SP联用时，其贡献减小。添加CA的灌浆抗压强度在各龄期均高于参考龄期。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.