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以渣土砂为细骨料，系统探究了PP纤维与PVA纤维对3D打印砂浆力学及可打印性能的影响，揭示纤维-基体的界面行为与增强机制。结果表明：PVA纤维因其亲水性与高弹性模量，在掺量≤0.75%时可同时优化流动性、提升28 d强度，并降低干缩；PP纤维掺量需控制在0.75%以内以避免团聚。在相同掺量下，PVA纤维在力学强度、减缩效果、优化孔隙能力方面均优于PP纤维。本研究为纤维增强渣土砂3D打印砂浆的性能优化提供了技术支持，为工程渣土提供了高值化利用路径，以此助力建筑业低碳转型。
Abstract：This study uses construction waste sand as fine aggregate and systematically investigates the effects of PP fibers and PVA fibers on the mechanical properties and printability of 3D-printed mortar. The fiber-matrix interface behavior and reinforcement mechanisms are revealed. The results indicate that PVA fibers, due to their hydrophilicity and high elastic modulus, can simultaneously optimize flowability, enhance 28 d strength, and reduce drying shrinkage when the addition ratio is ≤0. 75%. PP fibers must be controlled below 0. 75% to avoid agglomeration. At the same addition ratio, PVA fibers outperform PP fibers in terms of mechanical strength, inhibition of drying shrinkage, and optimization of pore formation. This study provides technical support for the performance optimization of fiber-reinforced 3D printing mortar with construction waste sand, offers a high-value utilization path for construction waste, thereby contributing to the low-carbon transformation of the construction industry.
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基本信息:
DOI：10.19740/j.2096-9872.2025.04.08
中图分类号:TU578.1
引用信息:
[1]周文娟,杨灿,何晓等.纤维增强渣土砂3D打印砂浆力学及可打印性能研究[J].北京建筑大学学报,2025,41(04):62-72.DOI:10.19740/j.2096-9872.2025.04.08.
基金信息:
科技部国家重点研发计划项目(2022YFC3803403)