Multifunctional concrete form book-pad

Abstract

The invention provides a multifunctional concrete formwork underlay, and is characterized in that the underlay is formed by a drainage exhaust layer and a filter layer, wherein the surface of the drainage exhaust layer is provided with grids or grazing, and the filter layer is an earthwork fabric layer with certain porosity and permeability. The drainage exhaust layer is a drainage body with a three-dimensional porous structure; the dimension of pores of the drainage body is determined by the pouring requirement of concrete; the thickness of the drainage body is between 1.5 and 2.0mm; each grid can be of a quadrangular shape or a hexagonal shape with a side length of between 0.3 and 0.5mm; and the filter layer can be the earthwork fabric layer. The earthwork fabric layer adopts a spunbonded continuous yarn earthwork fabric; the pore diameter and the permeability of the earthwork fabric layer are determined by the pouring requirement of the concrete; the pore diameter of the earthwork fabric layer is generally of between 0.15 and 0.20mm; and the permeability coefficient of the earthwork fabric layer is generally Kx10<-3>cm / s. The multifunctional concrete formwork underlay can automatically drain water, exhaust steam and perform maintenance, thereby improving the strength and compactness of the surface layer of the concrete; moreover, construction is convenient, formwork removal time is shortened, the turnover rate of the formwork is increased, and the cost is reduced.

Description

technical field [0001] The invention relates to a concrete formwork pad, in particular to a multifunctional concrete formwork pad which improves the strength and properties of the concrete surface layer. Background technique [0002] At present, many concrete pouring projects (such as reservoir dams, bridges, etc.) have serious surface quality problems such as dew sand, pockmarks, air bubbles, honeycombs, and cracks in the early stage of pouring, which seriously affect the durability of concrete. At this stage, two methods are used to improve the quality of the concrete surface: one is to add an additional coating (organic coating or modified cement mortar coating) on ​​the hardened concrete surface, but the coating needs to be coated additionally, and it is still aging. And the problem of easy detachment requires regular repainting, which is labor-intensive and expensive; second, when the concrete is formed, the concrete surface treatment is carried out in combination with ...

AI Technical Summary

Problems solved by technology

[0002] At present, in many concrete pouring projects (such as reservoir dams, bridges, etc.), in the early stage of pouring, there are generally serious surface quality problems such as dew sand, pockmarks, air bubbles, honeycombs, and cracks, which seriously affect the durability of concrete.

At this stage, two methods are used to improve the quality of the concrete surface: one is to add an additional coating (organic coating or modified cement mortar coating) on ​​the hardened concrete surface, but the coating needs to be coated additionally, and it is still aging. And the problem of easy detachment requires regular repainting, which is labor-intensive and expensive; second, when the concrete is formed, the concrete surface treatment is carried out in combination with the molding process itself, that is, the vacuum dehydration technology of cast-in-place concrete, which can improve the compactness of the concrete surface itself. The effect is better; but the construction is complicated and the cost is high

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