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A water permeability recovery method for planing and milling regeneration of blocked permeable concrete pavement surface

A technology of permeable concrete and recovery method, which is applied to cohesive pavement paved on site, roads, roads, etc., which can solve the problems of reduced water permeability, failure, and limited effect of blockages, and achieve heavy workload, high cost, and good quality The effect of regeneration effect

Active Publication Date: 2021-02-26
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the permeable concrete pavement is gradually clogged during use, causing its water permeability to decrease or even fail, existing practices have shown that measures such as daily cleaning, high-pressure water flushing, and vacuum suction have limited effect on removing clogs. The inventor's experimental research shows that clogging is mainly concentrated Within 2cm of the surface layer, therefore, planing and milling regeneration of only 2-4cm of the permeable concrete surface layer is an effective, economical and feasible method to restore the water permeability of the permeable pavement, and provides an effective means for the recovery of the water permeability of the blocked permeable pavement. It plays an important role in promoting the construction of "sponge city" and urban flood control

Method used

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  • A water permeability recovery method for planing and milling regeneration of blocked permeable concrete pavement surface
  • A water permeability recovery method for planing and milling regeneration of blocked permeable concrete pavement surface
  • A water permeability recovery method for planing and milling regeneration of blocked permeable concrete pavement surface

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Experimental program
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Effect test

Embodiment 1

[0027] 1. Preparation of permeable concrete

[0028] (1) Screening of crushed stone aggregates, screening granite crushed stone aggregates through stainless steel screens with apertures of 4.75mm and 9.50mm, discarding particles with a particle size of less than 4.75mm and larger than 9.50mm, and using 4.75-9.50mm Crushed stone is used as surface aggregate, and the apparent density of crushed stone is 2652kg / m 3 , Bulk density 1469kg / m 3 , porosity 44.6%, crushing value 10.5%, mud content 0.6%.

[0029] (2) Use the aggregate screened in step (1), use 42.5 grade ordinary Portland cement as the binder, add polycarboxylate retarding high-performance water reducing agent, and mix the mixture with water. Control the water-cement ratio to 0.3, the cement-collection ratio to 3.7, and the amount of water-reducing agent added to be 0.3% of the cement mass. The mixing and forming method is: add coarse aggregate and 50% water to the forced mixer and mix for 30s, then add cement, water...

Embodiment 2

[0039] 1. Preparation of permeable concrete

[0040] (1) Screening of crushed stone aggregates, screening granite crushed stone aggregates through stainless steel screens with apertures of 3.35mm and 7.50mm, discarding particles with a particle size of less than 3.35mm and larger than 7.50mm, and using 3.35-7.50mm Crushed stone is used as surface aggregate, and the apparent density of crushed stone is 2652kg / m 3 , Bulk density 1552kg / m 3 , porosity 40.5%, crushing value 9.4%, mud content 0.5%.

[0041] (2) Use the aggregate screened in step (1), use 42.5 grade ordinary Portland cement as the binder, add polycarboxylate retarding high-performance water reducing agent, and mix the mixture with water. Control the water-cement ratio to 0.3, the cement-collection ratio to 4, and the amount of water-reducing agent added to be 0.3% of the cement mass. The mixing and forming method is: add coarse aggregate and 50% water to the forced mixer and mix for 30s, then add cement, water re...

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Abstract

The invention relates to a method for restoring water permeability by planing and milling the surface layer of blocked permeable concrete pavement. The surface layer of permeable concrete pavement is mechanically planed and milled for 2-4cm; physical cleaning is carried out to remove coarse debris particles on the planed and milled surface, and suction is ≥3min under the condition of vacuum degree ≥30kPa to remove fine debris in the surface gap; Spray adhesive 0.1‑0.12L / m on the milling face 2 ; Prepare new permeable concrete mixture, spread a layer of new permeable concrete mixture on the planing and milling work surface after spraying the binder, compact and form, and cover the film for 28 days to realize the permeable concrete pavement permeable sexual regeneration. The water permeability recovery rate of the permeable concrete pavement after regeneration is ≥90%.

Description

technical field [0001] The invention belongs to the professional field of water supply and drainage engineering of the discipline of municipal engineering, and in particular relates to a method for restoring water permeability by planing and milling regeneration of the surface layer of blocked permeable concrete pavement. Background technique [0002] The urban waterlogging problem brought about by rapid urbanization has become an urgent problem to be solved. In October 2015, the State Council issued the "Guiding Opinions on Promoting the Construction of Sponge City" and proposed the use of infiltration, stagnation, storage, purification, use, and drainage. By 2020, 70% of the rainfall will be absorbed and utilized locally, which is the goal of sponge city construction. Permeable concrete pavement is an eco-friendly concrete pavement material, which has the advantages of reducing urban pavement rainfall runoff, reducing the pressure of urban drainage system, effectively repl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C7/14C04B28/00C04B28/04
CPCC04B28/00C04B28/04C04B2111/00284C04B2111/00637C04B2111/0075C04B2201/50E01C7/147C04B2103/302C04B24/2623C04B14/048
Inventor 赵金辉谢西姜成孙瑶吴梦柯林晨彤刘杰
Owner NANJING TECH UNIV