Autogenous shrinkage and cracking of ultra-high-performance concrete with soda residue as an internal curing agent

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Materials and Structures Pub Date : 2024-11-05 DOI:10.1617/s11527-024-02499-4

Yibo Yang, Xiaodong Yue, Baixi Chen, Wen Yang, Wenying Guo, Hengchang Wang

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Abstract

Autogenous shrinkage and shrinkage-induced cracking present significant challenges in ultra-high-performance concrete (UHPC). To address this issue, this study explores the feasibility of using soda residue (SR), an industrial waste product, as a sustainable internal curing agent for UHPC. Experimental results demonstrate that the inclusion of SR substantially mitigates shrinkage and cracking in UHPC, while also enhancing compressive strength. The use of SR with additional water showed comparable or superior performance in reducing shrinkage and cracking compared to higher dosages of SR. Through internal humidity measurements, thermogravimetric analysis, and scanning electron microscopy, two primary mechanisms for the improvement were identified: (1) SR increases internal humidity by releasing additional water, thus preventing shrinkage; and (2) the ettringite formation induced by SR expands the solid phase volume, compensating for shrinkage. Furthermore, utilizing SR as a recycled material not only improves the early-age properties of UHPC but also contributes to sustainable construction practices.

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使用苏打渣作为内部养护剂的超高性能混凝土的自生收缩和开裂问题

自生收缩和收缩引起的开裂是超高性能混凝土（UHPC）面临的重大挑战。为解决这一问题，本研究探讨了使用工业废渣苏打渣（SR）作为超高性能混凝土可持续内部固化剂的可行性。实验结果表明，加入苏打渣可大大缓解 UHPC 的收缩和开裂，同时还能提高抗压强度。与更高剂量的 SR 相比，使用添加水的 SR 在减少收缩和开裂方面的性能相当或更优。通过内部湿度测量、热重分析和扫描电子显微镜，确定了两种主要的改善机制：(1) SR 通过释放更多的水分来增加内部湿度，从而防止收缩；以及 (2) SR 诱导形成的乙长石扩大了固相体积，从而补偿了收缩。此外，利用 SR 作为再生材料不仅可以改善超高强度混凝土的早期龄期特性，还有助于可持续建筑实践。

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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.