MIX RATIO OF GRAPHITE TAILINGS FOAM CONCRETE BASED ON ORTHOGONAL THEORY

Abstract

In order to study the effects of water-binder ratio, fly ash content, sand-binder ratio and the amount of Graphite Tailings replacing river sand on the mechanical and physical properties of Graphite Tailings Foam Concrete (GTFC), based on the orthogonal theory, the 7d compressive strength, 28d compressive strength and porosity of graphite tailings foamed concrete were analyzed by range analysis and variance analysis. At the same time, the compressive strength and porosity of foamed concrete as performance indicators of the matrix analysis of a single proportion of optimization. The results show that among the factors affecting the compressive strength of GTFC, the content of fly ash and the water-binder ratio are the main factors, the order of influencing the compressive strength of fly ash foamed concrete is water-cement ratio, fly ash, sand-cement ratio and the amount of river sand replaced by graphite tailings, among the factors influencing the porosity of GTFC, the sand-cement ratio is the main factor, the order of influencing porosity of fly ash foamed concrete is sand-binder ratio, fly ash-water-binder ratio, graphite tailings instead of river sand, porosity and compressive strength are taken as performance indexes of foamed concrete, the optimized ratio of Matrix analysis is as follows: water-binder ratio 0.44, fly ash 40% , sand-binder ratio 0.8, graphite tailings 15% to replace river sand.