Optimization design of permeable concrete mix proportions with metakaolin-based geopolymer
This paper investigates the influence of four factors of water-binder ratio,target porosity,metakaolin content,and alkali equivalent on the strength and permeability indicators of geopolymer permeable concrete through orthogonal experiments.The research results indicate that the effects of these four factors on the com-pressive strength and permeability coefficient of geopolymer permeable concrete show completely opposite trends.Among them,the target porosity has the most significant impact on both compressive strength and per-meability coefficient,followed by the water-binder ratio.The fitting of the compressive strength and permeabil-ity coefficient reveals a negative correlation,with an increasing correlation as the curing period progresses.The 28-day compressive strength of geopolymer permeable concrete for the experimental mixtures in Groups 10 and 11 is 20.7 and 22.0 MPa,respectively,while the permeability coefficients are 1.18 and 0.52 mm·s-1.These values meet the requirements of the"Technical Specifications for Permeable Concrete Pavements,"with the permeability coefficient for Group 10 far exceeding the minimum requirements of the specifiication,showcasing excellent permeability performance.
万方数据
维普
