Research on the mix design and anti blocking performance of double-layer permeable concrete
SUN Kelong
YUAN Wenhua
ZHAI Haoran
Abstract：To solve the problem of easy blockage and short service life of permeable concrete,this arti-cle adopts a layered structure design,which matches the particle sizes of aggregates(a1(upper layer 2～5 mm,lower layer 5～10 mm),a2(upper layer 2～5 mm,lower layer 10～20 mm),a3(upper lay-er 5～10 mm,lower layer 10～20 mm)),and intercepts blockages with small particle size aggregates(2～5 mm,5～10 mm)in the upper layer and quickly drains with large particle size aggre-gates(5～10 mm,10～20 mm)in the lower layer,significantly improving the anti blockage perform-ance through mutual cooperation.Using L9(34)orthogonal experiment,the effects of aggregate parti-cle size matching(a1,a2,a3),layering ratio(5∶5,6∶4,7∶3),polypropylene fiber content(0.3％～0.4％),and reinforcing agent content(3％～5％)on the performance of permeable concrete were studied.The results showed that when the particle size matching was a1,the layering ratio was 6∶4,the polypropylene fiber content was 0.3％,and the reinforcing agent content was 4％,the com-pressive strength of concrete at 28 days reached 18.5 MPa,the splitting tensile strength was 5.2 MPa,and the permeability attenuation rate after 35 blocking cycles was only 22.5％.This study effectively solved the problem of blockage in single-layer permeable concrete,while simultaneously achieving a synergistic improvement in mechanical properties and permeability.
Keywords：anti clogging permeable concretestratification ratiocompressive strengthsplitting tensile strengthpolypropylene fiberreinforcing agent
Publication Date：2025-08-10
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 93-99 )