In order to investigate the hydration characteristics of water supply aluminum sludge ash modified concrete,samples were prepared with different dosages(0％,10％,20％,30％)of calcined water supply aluminum sludge ash and subjected to XRD,TG,SEM tests.Combined with sulfuric acid corrosion resistance experiments,their corrosion resistance characteristics were analyzed.The results show that when the amount of aluminum sludge ash added to the water supply is 10％～20％,the flexural and compressive strength of concrete can be improved,and the sulfuric acid corrosion resistance performance is optimal at the amount of 20％.This is due to the pozzolanic effect of water supply aluminum sludge ash,which produces hydrated calcium silicate gel(C-S-H)to fill capillary pores.The micro aggregate effect can also refine concrete pores and improve the densification level of concrete microstructure;On the other hand,the addition of aluminum sludge ash in water supply reduces the Ca/Si ratio of the system,increases the Al/Si ratio,reduces the content of hydration product Ca(OH)2,promotes the formation of acid resistant phases such as C-A-H,and thus reduces the invasion and corrosion rate of the corrosive medium.This study can provide reference for concrete modification and the development of corrosion-resistant concrete.
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