考虑老化微观结构的低热和中热水工混凝土抗冻性的多尺度热孔力学模拟

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-12 DOI:10.1016/j.conbuildmat.2024.139062

Zhe Huang , Jiazhang Cao , Fuyuan Gong , Ding Nie , Wenwei Li , Peng Lin , He Zhang

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引用次数: 0

摘要

寒冷地区的水工混凝土结构很容易受到冻融破坏。本文提出了一种多尺度模拟分析方法来研究低热硅酸盐（LHP）水泥、中热硅酸盐（MHP）水泥和普通硅酸盐水泥（OPC）混凝土的力学性能和抗冻性。计算并比较了 LHP、MHP 和 OPC 混凝土在不同养护龄期的水化热、水化程度、孔径分布和抗压强度，以及在不同冻融循环条件下的冰量、膨胀应变和力学性能。由于 LHP 早期水化的 C3S 含量较低，而后期水化的 C2S 含量较高，因此 90d 养护后 LHP 的孔隙率低于 MHP 和 OPC，从而具有更好的力学性能和抗冻性。在此基础上，本文提出的演化模型可以定量分析不同C3S和C2S含量水泥浆的抗冻性，为预测寒冷地区水工混凝土结构的抗冻性提供了可行的方法。

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Multi-scale thermo-poro-mechanical simulation of the frost resistance of low-heat and moderate-heat hydraulic concrete considering the aging microstructure

Hydraulic concrete structures in cold regions are vulnerable to freeze-thaw damage. This paper proposes a multi-scale simulation analysis approach to investigate the mechanical properties and frost resistance of Low-heat Portland (LHP) cement, Moderate-heat Portland (MHP) cement, and Ordinary Portland cement (OPC) concrete. The hydration heat, hydration degree, pore size distribution, and compressive strength of LHP, MHP, and OPC concrete at different curing ages, as well as the ice amount, expansion strain, and mechanical properties under different freeze-thaw cycles are calculated and compared. Due to the lower early-hydrated C₃S content of LHP and the higher later-hydrated C₂S content, the porosity of LHP after 90d curing is lower than that of MHP and OPC, resulting in better mechanical properties and frost resistance. On this basis, the evolution model proposed in this paper can quantitative analysis the frost resistance of cement paste based on different content of C₃S and C₂S, which provided a feasible method for predicting the frost resistance of hydraulic concrete structures in cold regions.

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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.