Mix proportion optimization of ultra-thin cement-based paving materials for old cement concrete pavement
MA Shibin
HOU Licheng
LIU Yuezhao
ZHANG Junfei
Abstract：Rapid repair of old cement pavement was a technical problem faced by highway maintenance personnel,and ultra-thin paving was a low-cost and high-efficiency maintenance solution.In order to obtain the optimal mix proportion for ultra-thin cement-based paving materials,based on the analysis of the strength development law and early hydration mechanism of cement-based cementitious material system,the reference mix proportion was determined.Then,the water-binder proportion,auxiliary cementitious material replacement rate and cement-sand proportion were taken as independent variables,and A-optimal mixed design method of three factors and eleven groups of experiments(311-A optimal mixed design method)was used to optimize the mix design.The influence of independent variables on flexural strength,compressive strength and fluidity of design indexes were systematically analyzed.Three mix proportion combinations were obtained through simulation calculation,and a comprehensive analysis was conducted on the economic,technical,and workability aspects.The results show that the optimal mix proportion of material mass percentage obtained by 311-A optimal mixed design method is water-binder proportion of 0.32,auxiliary cementitious material replacement rate of 15％and cement-sand proportion of 1.0.The error of mechanical strength and fluidity between the predicted value and the measured value based on the indoor verification test is within 5％.
Keywords：cement-based materialultra-thin pavingmix proportion optimizationoptimal mixed designhydration mechanism
Publication Date：2023-12-25
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：12( 27-38 )