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谢梅良¹ , 郑   权²

 

(1. 广西交通技师学院 , 南宁   530001, 2. 河北省省直房地产服务中心 , 石家庄    050000)

摘  要: 为研究公路混凝土多元掺合料复掺对力学性能和体积稳定性的影响机理 , 开展硅灰  (SF) 、矿渣粉(SL) 和粉煤灰  (FA) 两两复掺及三元复掺试验 , 测定各工况下混凝土的抗压强度 、弹性模量和干燥收缩率 ,并利用极差分析确定各个因素的影响程度 。研究表明 : 在多数二元体系中 , 力学性能和干缩率随掺量增加呈先改善后回落的趋势 , 其中 SF+SL 复掺在 4%SF 和 15%SL 时效果最好 ; SF+FA 复掺下干缩率随 FA 掺量的增加不断下降 ; 三元复掺体系中 SF 6%、SL 15%、FA 5%时抗压强度达到峰值  (69. 78 MPa) ; 极差和方差分析显示 , SF 是影响抗压强度和干缩性能的最主要因素 , SL 对收缩控制效果最好 , FA 主要起调节工作性和长期性能的作用 。研究结论可为公路工程中混凝土材料的设计提供参考。

关键词: 多元掺合料 ; 三元复掺 ; 抗压强度 ; 干燥收缩率 ; 极差分析

中图分类号: TU528      文献标志码: A      文章编号: 1005-8249 (2026) 04-0078-07

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 04. 012

 

Research on the Mechanical Properties and Drying Shrinkage of Highway

Concrete with Multi-component Blending of Admixtures

XIE Meiliang ¹ , ZHENG Quan ²

(1. Guangxi Institute of Transportation Technicians, Nanning 530001, China;

2. Hebei Provincial Direct Real Estate Service Center, Shijiazhuang 050000, China)

Abstract : To investigate the mechanism of the combined use of multiple admixtures in highway concrete on its mechanical properties and volume stability, experiments were conducted on the two-component and three-component combined use of silica fume (SF) , slag powder (SL) , and fly ash (FA). The compressive strength, elastic modulus, and drying shrinkage rate of the concrete under various conditions were measured. The influence degree of each factor was determined using range analysis. The results show that in the binary combined system, the mechanical properties and drying shrinkage rate of the concrete both show a trend of improvement first and then decline with the increase of the dosage of each admixture.  Among them, the SF + SL combination has the best effect at 4% SF and 15% SL; the drying shrinkage rate decreases continuously with the increase of FA dosage in the SF + FA combination; in the ternary combined system, the compressive strength reaches the peak (69. 78 MPa) when SF is 6% , SL is 15% , and FA is 5% ; range and variance analysis show that SF is the factor that most affects the compressive strength and drying shrinkage performance, SL has the best effect on shrinkage control, and FA mainly plays the role of adjusting workability and long-term performance. The research conclusions can provide a reference for the design of concrete materials in highway engineering.

Key words: multicomponent admixtures; ternary composite addition; compressive strength; drying shrinkage rate; range analysis