Preparation and Performance Study of Coal Gasification Slag Concrete
Coal gasification slag concrete prepared by partially replacing natural river sand with coal gasification slag has the advantages of light weight,high compactness,good mechanical properties and durability.By adding fly ash and polycarboxylic acid water-reducing agent to optimize the mixing ratio of coal gasification slag concrete and improve the workability of the concrete,the effects of different water-binder ratios,sand rates and substitution rates of coal gasification slag and fly ash on the mechanical properties of coal gasification slag concrete were tested.The results show that coal gasification slag has similar particle and physical properties to ordinary river sand,and the strength performance of concrete is good when the water-cement ratio is 0.44,the sand rate is 0.42,and the fly ash replacement rate is 10%,and the dosage of coal gasification slag can be up to 409 kg/m3.Through the durability test,it is concluded that the coal gasification slag concrete can withstand 150 freeze-thaw cycles,and the impermeability grade is P12 after 28d.Carbonation depth is less than 1 mm at 28d and has good durability.
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