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李   添

 

(黑龙江中医药大学附属第二医院 , 哈尔滨    150000)

摘  要: 针对传统水泥稳定碎石抗裂性不足 , 以及单掺橡胶粉改性材料力学强度偏低的问题 , 提出混掺橡胶粉和硅灰的改性方案 , 研究了单掺橡胶粉 、单掺硅灰及复掺橡胶粉和硅灰水泥稳定碎石混合料的力学性能与抗裂性能 。结果表明 : 掺加适量橡胶粉可改善水泥稳定碎石混合料的抗变形特性和延长疲劳寿命 , 但会降低混合料的力学性能 ; 掺加硅灰显著增强了橡胶粉水泥稳定碎石的力学性能 , 改善其温缩变形特性与抗疲劳性能 , 但掺加硅灰对水泥稳定碎石混合料的早期干缩抗裂性能有负面影响 ; 复掺硅灰和橡胶粉显著提升了水泥稳定碎石的力学强度、抗温缩开裂性能与抗疲劳耐久性能 , 推荐适宜的硅灰和橡胶粉掺量分别为 1. 5%和 1. 0% ~2. 0%。研究成果为橡胶粉、硅灰工业固废的资源化高效利用提供新思路 , 也为水泥稳定碎石抗裂改性技术的工程应用提供借鉴。

关键词: 水泥稳定碎石 ; 橡胶粉 ; 硅灰 ; 力学性能 ; 抗裂性能

中图分类号: U414      文献标志码: A      文章编号: 1005-8249 (2026) 04-0072-06

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 04. 011

 

Study on Rubber Powder-Silica Fume Modified Cement-Stabilized Crushed Stone

LI Tian

(Second Affiliated Hospital of Heilongjiang University of Traditional Chinese Medicine,

Harbin 150000, China )

Abstract : Traditional cement-stabilized macadam suffers from insufficient crack resistance, and single incorporation of rubber powder will lead to low mechanical strength of modified mixtures. To solve the above problems, a composite modification method incorporating rubber powder and silica fume was proposed in this study.  The mechanical properties and crack resistance of cement - stabilized macadam mixtures with single rubber powder, single silica fume, and combined admixtures were experimentally investigated. The results show that appropriate rubber powder dosage can improve the deformation resistance and fatigue life of the mixture but reduce its mechanical strength.  The addition of silica fume can significantly enhance the mechanical properties, temperature shrinkage characteristics and fatigue resistance of rubber powder-modified cement-stabilized macadam , whereas it has an adverse effect on the early drying shrinkage crack resistance of the mixture. The combined addition of silica fume and rubber powder exerts a synergistic modification effect, which remarkably improves the mechanical strength, temperature shrinkage crack resistance and fatigue durability of cement - stabilized macadam.  Based on comprehensive performance evaluation, the optimal dosages of silica fume and rubber powder are recommended as 1. 5% and 1. 0% – 2. 0% , respectively. This study provides a new insight for the efficient resource utilization of industrial solid wastes including rubber powder and silica fume, and offers a reference for the engineering application of crack-resistance modification technology for cement-stabilized macadam.

Key words: cement-stabilized macadam; rubber powder; silica fume; mechanical properties; crack resistance