Effect of curing regimes on the long-term stability of cement paste with low water-to-cement ratio

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

Construction and Building Materials Pub Date : 2025-04-11 DOI:10.1016/j.conbuildmat.2025.141182

Fangmei Huang , Jiaping Liu , Xiancheng Li , Cong Li , Zhangli Hu , Xiujiang Shen , Baochun Chen

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引用次数: 0

Abstract

Cement-based materials with a low water-to-cement ratio (w/c) may develop cracks and undergo mechanical degradation due to swelling under water curing and shrinkage in sealed and drying conditions. The evolution of the performance under different curing conditions and the underlying mechanisms involved are still unclear. To address this, the mechanical properties, deformation, and mass change of cement pastes with w/c ranging from 0.14 to 0.45, cured in lime-saturated water, sealed, and drying conditions for 360 days were investigated. Additionally, the mechanisms that govern the observed alterations in mechanical properties were explored. The results show that the absorbed water promoted the hydration of cement paste with low w/c, which outweighed the softening effect, leading to an increase in compressive strength. Initially, the new hydration products densified the structure, enhancing the compressive strength of the cement paste. However, once the space is filled, the hydration products can cause cracking in the cement paste, resulting in decreases in compressive strength. Under sealed and drying conditions, the compressive strength of cement paste decreased due to shrinkage cracks, especially for cement paste with low w/c.

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养护制度对低水灰比水泥浆体长期稳定性的影响

水灰比（w/c）较低的水泥基材料在水固化条件下会发生膨胀，在密封和干燥条件下会发生收缩，从而产生裂缝和机械退化。在不同的固化条件下，其性能的演变及其潜在的机制尚不清楚。为了解决这一问题，研究了w/c范围为0.14至0.45、在石灰饱和水中、密封和干燥条件下固化360天的水泥浆体的力学性能、变形和质量变化。此外，还探讨了控制所观察到的机械性能变化的机制。结果表明：低w/c水泥浆体吸水后，水泥浆体的水化作用大于软化作用，导致水泥浆体抗压强度提高；最初，新型水化产物使结构致密化，提高了水泥浆体的抗压强度。然而，一旦空间被填满，水化产物会引起水泥浆体开裂，导致抗压强度下降。在密封和干燥条件下，水泥浆体的抗压强度因收缩裂缝而降低，特别是对于低w/c的水泥浆体。

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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.