A special cementing agent for self-curing permeable concrete and its application

Abstract

The invention discloses a special cement for self-curing permeable concrete and an application thereof. The mass parts of each component of the cementing agent of the present invention are: 1-5 parts of internal curing agent, 2-6 parts of water reducing agent, 10-30 parts of reinforcing agent, and 60-85 parts of expansion agent; the internal curing agent Any one or more selected from superabsorbent resins (SAP) with a particle size of 0.075‑0.2mm, 0.2‑0.3mm, 0.3‑0.4mm, and 0.4‑0.5mm; the superabsorbent resin is selected from starchy high Any of water-absorbent resins, cellulose-based superabsorbent resins, and synthetic polymer-based superabsorbent resins. The components of the permeable concrete using the special cement of the present invention have good synergistic effects. The cement absorbs excess water during the production and transportation stage, reduces water loss before the concrete is hardened, and increases the grouting of the slurry during transportation. After hardening, it releases water slowly, which can provide moisture for the expansion agent reaction, and achieve the dual effect of internal maintenance, which can reduce the shrinkage of permeable concrete and reduce concrete cracks.

Description

A special cementing agent for self-curing permeable concrete and its application technical field The present invention relates to the technical field of permeable concrete in building materials, be specifically related to a kind of self-curing permeable concrete Special binders and their applications. Background technique Permeable concrete has good water permeability, efficient water storage capacity and good decoration, and is one of the "sea water". It is a new type of material worthy of promotion in the construction of "Miancheng City", which is currently widely used in sidewalks, parking lots and squares. Hydraulic concrete is a kind of porous lightweight concrete made of aggregate, cementitious material and water, without fine aggregate and composed of coarse bone. The surface of the material is covered with a thin layer of cement slurry and bonded to each other to form a honeycomb structure with uniform distribution of pores. [0003] There are many problems i...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems existing in the current permeable concrete, the present invention proposes a special cement for self-curing permeable concrete, which can solve the early rapid water loss of permeable concrete before hardening, improve the groutability of aggregate, release water after hardening to realize self-curing, and reduce shrinkage cracking and prevent the strength backlash problem

[0009] The purpose of the present invention is to overcome the disadvantages of the existing permeable concrete, and propose a method: the cement absorbs and stores excess water during the production stage, and due to the special structure of SAP, prevents the rapid loss of water before the concrete is hardened, and solves the problem of peeling off of surface stones after hardening. The problem of strength shrinkage; the synergistic effect of the internal curing agent and the reinforcing agent during transportation can better improve the slurry-hanging performance of the aggregate, and there will be no problem of slurry sinking to the bottom, which is convenient for the popularization and use of ready-mixed permeable concrete; it will be stored after hardening The slow release of water can not only provide moisture for the expansion agent reaction, but also achieve the dual effect of internal curing, which can reduce shrinkage and cracks; the pore structure of hardened concrete can be designed through different particle sizes of SAP and different graded stones, SAP After dehydration in the concrete, a circular hole is formed; the hole formed by SAP after dehydration can be designed according to the size of the SAP, with different pore diameters, especially tiny holes and regular round holes with larger holes and irregular holes contribute to strength

Images