Grey Correlation Analysis of Influence of Mineral Admixtures on Concrete Carbonation Resistance
The influence of mineral admixtures on concrete carbonation resistance was analyzed by changing the dosage and combination ways of slag and fly ash,as well as the water-binder ratio.At the same time,a quantitative analysis was conducted on the influence degree of various factors on concrete carbonation resistance by grey correlation theory.The inflence mechanism of mineral admixtures was explored by the chemical composition of the hydration products of the hardened slurry.The research results show that both the addition of mineral admixtures and increasing the water-binder ratio can increase concrete carbonation depth.When the single addition of Grade Ⅰ fly ash exceeds 40％,the carbonation depth increases rapidly;Under the same total dosage,the concrete carbonation resistance with com-pound mineral admixture group is better than that of single fly ash group;Among the different combinations of slag and fly ash,the concrete carbonation depth of the S105 slag+Grade Ⅰ fly ash group is the highest;The impact degree of various factors is ranked from high to low as follows:water-binder ratio＞single addition of Grade Ⅰ fly ash content＞composite addition total amount of S95 slag+Grade Ⅰ fly ash＞combination of mineral admixtures;XRD analysis shows that the diffraction peak height of Ca(OH)2 gradually decreases with the increase of fly ash content,indicating that the volcanic ash reaction of fly ash consumes a large amount of Ca(OH)2,thereby gradually reduced concrete carbonation resistance.
国家科技期刊平台
NSTL
万方数据
