关键词: 无砂混凝土;配合比设计;椭球体模型;比表面积;裹浆厚度;

Abstract: Sand free concrete is made of water,coarse aggregate,cement and other materials,which has good water permeability and air permeability and can be used in urban construction and river slope protection projects. At present,the strength of sand-free concrete designed according to themodern concrete mix design manualis not high and the porosity is too large. Therefore,a new mix design method based on the specific surface area of ellipsoid model was proposed. The total cement slurry demand was quantified as the product of aggregate total surface area,slurry thickness and cement slurry density,and the above indexes were calculated by appropriate methods. According to this method,the compressive strength and porosity of concrete were tested. The results showed that the mixture ratio design result based on the specific surface area of ellipsoid model was reliable and superior to the design method based onmodern concrete mixture ratio design manualin all aspects.

Key words: sand-free concrete; mix design; ellipsoid model; specific surface area; coating thickness;