Experimental study on mixture ratio design of high-performance concrete used on high-speed ballastless railway

摘要

High-performance concrete is designed with high strength, high durability and high workability andis used for a particular purpose and environment. Considering the working characteristics anddurability requirements of high-speed ballastless railway, experimental study on mix proportiondesign and maintenance measures of C60 high-strength concrete are conducted. It is proposedfrom the orthogonal test that the optimal mixture ratio scheme for high-performance concreteused on high-speed ballastless railway is that water–cement ratio is 0.29, sand ratio is 38% andadmixture ratio of the total cementitious material is 10%. The influence regularity is obtained oncompressive strength at different periods of high-performance concrete by main influencingfactors such as water–cement ratio, admixture amount, sand rate, etc. Tests show thatwater–cement ratio affects the later strength while admixture amount affects the early strengthand sand rate has little effect.