Axial compressive and long-term shrinkage behaviors of self-compacting recycled concrete reinforced with recycled glass fiber

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

Construction and Building Materials Pub Date : 2024-11-14 DOI:10.1016/j.conbuildmat.2024.139158

Fubin Zhang , Rujun Zheng , Gaoyu Liao , Dianchao Wang , Zhengyi Lu , Haining Meng , Zheng Lu

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引用次数: 0

Abstract

Self-compacting recycled concrete (SCC) has properties of significant shrinkage deformation and early cracking, which limits its wide application in civil engineering applications. Waste fiber addition offers an effective solution to these challenges. This research focuses on waste glass fiber and explored the impact of various parameters on the performance of recycled glass fiber-reinforced self-compacting recycled aggregate concrete (RGF-SCRC). Incorporating waste glass fiber effectively inhibits the long-term shrinkage rate of RGF-SCRC and improves its axial compressive strength, with the improvement of 2.2∼15.3 % in axial compressive strength and a reduction of 17.9∼66.5 % in the long-term shrinkage rate. However, excessive fiber addition shows an negatively effect on the performance of RGF-SCRC. The optimum addition was concluded as 7.5 kg/m³. On the other hand, the waste alkali-resistant glass fiber showed a higher improvement than waste glass fiber. Moreover, microstructure analysis reveals that the waste fibers could be uniformly dispersed within the investigated specimen, effectively bridging gaps and significantly enhancing the concrete’s strength and toughness. Furthermore, the number of large pores and overall porosity were reduced, resulting in greater compactness, improved axial compressive strength, and reduced long-term shrinkage of RGF-SCRC. After 180 days of curing, the porosity of the specimens significantly decreased when compared to the 28 day curing specimens. Based on experimental results, the axial compression stress-strain relationship and long-term shrinkage curves of RGF-SCRC were fitted and modified, and proposed an axial compression constitutive relationship and a long-term shrinkage theoretical analysis model which are applicable to RGF-SCRC. The models' correctness was verified by comparing them with experimental results. These research outcomes offer valuable insights for the future practical implementation of RGF-SCRC.

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用回收玻璃纤维加固的自密实再生混凝土的轴向抗压和长期收缩行为

自密实再生混凝土（SCC）具有明显的收缩变形和早期开裂特性，这限制了其在土木工程中的广泛应用。添加废纤维可有效解决这些难题。本研究以废玻璃纤维为重点，探讨了各种参数对再生玻璃纤维增强自密实再生骨料混凝土（RGF-SCRC）性能的影响。掺入废玻璃纤维可有效抑制 RGF-SCRC 的长期收缩率并提高其轴向抗压强度，轴向抗压强度提高了 2.2%∼15.3%，长期收缩率降低了 17.9%∼66.5%。然而，过量添加纤维会对 RGF-SCRC 的性能产生负面影响。最佳添加量为 7.5 kg/m³。另一方面，废旧耐碱玻璃纤维比废旧玻璃纤维的改善程度更高。此外，微观结构分析表明，废纤维可以均匀地分散在所研究的试样中，有效地弥合间隙，显著提高混凝土的强度和韧性。此外，大气孔的数量和整体孔隙率都有所降低，从而提高了 RGF-SCRC 的密实度，改善了轴向抗压强度，并减少了长期收缩。与 28 天固化的试样相比，180 天固化后试样的孔隙率明显降低。根据实验结果，对 RGF-SCRC 的轴向压缩应力-应变关系和长期收缩曲线进行了拟合和修正，提出了适用于 RGF-SCRC 的轴向压缩构成关系和长期收缩理论分析模型。通过与实验结果对比，验证了模型的正确性。这些研究成果为今后实际应用 RGF-SCRC 提供了宝贵的启示。

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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.