Study on preparation and properties of phosphogypsum planting concrete
Traditional slope protection is gradually replaced by planting concrete slope protection due to the large consumption of resources and the low survival rate of vegetation.Using solid waste phosphogypsum to prepare planting concrete can improve its comprehensive utilization rate,reduce the consumption of non-renewable resources,and improve the planting performance of concrete.The test takes phosphogypsum content and design porosity as variables to study the effect of phosphogypsum on the compressive strength,actual porosity and sand permeability of planting concrete,and select the optimal mix ratio,and conduct alkali reduction treatment by soaking in various solutions.The results show that the compressive strength of phosphogypsum planting concrete decreases with the increase of design porosity.When the design porosity is constant,the compressive strength decreases with the increase of phosphogypsum replacement ratio,and the compressive strength can reach 9.02 MPa at 7 d and 13.65 MPa at 28 d;The total porosity of phosphogypsum planting concrete is mainly determined by the design porosity,and decreases with the increase of phosphogypsum replacement rate;The lowest pH value of planting concrete can be reduced to 9.4 by adding phosphogypsum.
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