Limited by the technical level,the ecological level of small and medium-sized river treatment in rural areas is not high,meanwhile,a large amount of construction waste in rural areas is not fully utilized,which affect the envi-ronmental safety.Experimental investigate the preparation of calcined recycled fine powder by calcination and grinding with grinding agents,and then prepare generation-growing pervious concrete with calcined recycled fine powder and re-cycled coarse aggregate for medium and small riverbank protection.The results show that the particle size,water de-mand ratio,paste viscosity,saturation dosage of superplasticizer,paste strength of recycled fine powder become higher after the recycled calcined,among these recycled fine powders,the water demand ratio and paste viscosity reach to highest when the recycled fine powder calcined at 400℃,and that of paste strength reach to highest when the recycled fine powder calcined at 600℃,and when calcination temperature beyond 800℃,β-C2 S and gehlenite formed,which lead to reduction of paste strength.The particle become coarse after the recycled powder calcined,and the particle size of D50 decreased from 137 μm to 20.85 μm when the calcined recycled fine powder ground with 0.8%propylene gly-col,with the 20%replacement of cement of the calcined recycled fine powder,the prepared pervious concrete reach to various properties requirements regulated by specification for vegetation-growing concrete.The research results could provide valuable reference for ecological riverbank protection of small and medium-sized river.
关键词
生态护岸/透水混凝土/再生微粉/煅烧/粉磨/活化
Key words
ecological riverbank protection/pervious concrete/recycled fine powder/calcination/grinding/activation
维普
万方数据