再生塑性混凝土孔隙分布及徐变性能研究

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

Construction and Building Materials Pub Date : 2025-05-27 DOI:10.1016/j.conbuildmat.2025.141947

Haikuan Wu , Yichen Miao , Zhipeng Xu , Ding Wang , Feng Lu , Shun Kang , Zhile Shu , Yongyi Yang , Changwu Liu

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引用次数: 0

摘要

为了研究再生塑料混凝土随时间的长期变形特性。通过分析其应力应变关系，结合低场核磁共振和扫描电镜技术，研究了再生塑料混凝土的微观结构和孔隙率变化，并进行了蠕变试验。研究结果表明：再生塑性混凝土在弹性阶段的应力应变行为与普通混凝土相似，但在屈服和衰变阶段，其应力更高，衰变速度更快；再生塑料混凝土和普通混凝土的孔隙率分别为5.48 %和6.12 %，其中小毛管孔隙率占总孔隙率的比例分别为47.63 %和45.75 %。再生塑料的加入降低了混凝土的总孔隙率，改变了孔隙尺寸分布，减小了小孔隙的分形维数，增大了大孔隙的分形维数。此外，再生塑料的加入提高了水合硅酸钙凝胶在混凝土中的有序度，增强了凝胶结构的密实度。再生塑性混凝土在不同程度的应力加载后表现为瞬时应变、减速徐变和稳定徐变三个阶段，且徐变量随着加载应力的增大而逐渐增大。根据再生塑性混凝土的蠕变损伤特性，将损伤的粘性单元与塑性单元并联，构成损伤的粘性塑性单元。在Burgers模型的基础上，建立了考虑材料参数影响的蠕变模型，描述了蠕变衰减、稳定和加速阶段。验证了该模型能较准确地反映再生塑性混凝土在不同阶段的徐变行为。此外，参数敏感性分析表明，随着再生塑料替代率的增加，混凝土进入徐变加速阶段的时间提前。本研究可为再生塑料混凝土的性能优化和工程应用提供理论依据。

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Research on pore distribution and creep properties of recycled plastic concrete

In order to investigate the long-term deformation characteristics of recycled plastic concrete over time. By analyzing its stress-strain relationship and combining low field nuclear magnetic resonance and scanning electron microscopy techniques, the microstructure and porosity changes of recycled plastic concrete were studied, and creep tests were conducted. The research results indicate that the stress-strain behavior of recycled plastic concrete in the elastic stage is similar to that of ordinary concrete, but in the yield and decay stages, its stress is higher and the decay rate is faster. The porosity of recycled plastic concrete and ordinary concrete are 5.48 % and 6.12 %, respectively, with the proportion of small capillary porosity to the total porosity being 47.63 % and 45.75 %, respectively. Adding recycled plastics reduces the total porosity of concrete, changes the pore size distribution, and reduces the fractal dimension of small pores while increasing the fractal dimension of large pores. In addition, the addition of recycled plastic increases the order of hydrated calcium silicate gel in concrete, and enhances the compactness of gel structure. Recycled plastic concrete exhibits three stages of instantaneous strain, deceleration creep, and stable creep after various levels of stress loading, and the creep amount gradually increases with the increase of loading stress. Based on the creep damage characteristics of recycled plastic concrete, a damaged viscous element is connected in parallel with a plastic element to construct a damaged viscous plastic element. Based on the Burgers model, a creep model considering the influence of material parameters was established to describe the creep attenuation stability acceleration stages. It was verified that the model can accurately reflect the creep behavior of recycled plastic concrete at different stages. In addition, parameter sensitivity analysis indicates that as the replacement rate of recycled plastics increases, concrete will enter the creep acceleration stage earlier. This study can provide theoretical basis for the performance optimization and engineering application of recycled plastic concrete.

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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.