JPS5942452Y2 - Concrete curing sheet - Google Patents

Description

[Detailed description of the invention] The present invention relates to a concrete curing sheet.

After pouring concrete, it is necessary to protect the unhardened concrete to ensure sufficient hydration and to minimize cracks caused by drying or external forces.

This kind of work is called concrete curing.

The purpose of curing is (1) direct exposure to B light and weather (frost, wind).

protection of exposed concrete surfaces against rain),
(2) protect the concrete from impact and excessive loads until it is sufficiently hardened; (3) maintain the concrete at an appropriate temperature until it hardens; and (4) provide sufficient moisture during the hardening of the concrete. It's about giving.

Various methods are used to carry out such curing.

Broadly divided into wet curing and membrane curing. There are various methods such as steam curing and electric curing.

The most common of these is wet curing, which also includes methods such as drying, covering with wet canvas, and covering with wet straw.

Methods include covering with sand, etc., covering with waterproof paper, direct water spraying, and using chemicals.

The Japan Society of Civil Engineers recommends that this moist curing should be carried out for at least 5 days for ordinary Portland cement and for at least 3 days for early-strength Portland cement on all concrete surfaces that are not protected by forms. It has established.

Although each of the above-mentioned wet curing methods has excellent characteristics, each method requires extremely complicated curing work, and the members employed in each method are often used repeatedly.

However, with the widely adopted method of weir and canvas massing, the installation and removal of these materials requires a great deal of time and effort, and the time required to remove the concrete adhering to the weir and canvas is extremely high. The disadvantage was that the secondary work was extremely important and tedious work.

The present invention was developed in view of the above circumstances, and the purpose is to provide a concrete curing sheet that is easy to install, easy to remove, and configured to ensure wet curing. There is.

In order to achieve the above objective, the present invention uses a water-absorbing polymer as a base, has a synthetic resin sheet attached to its top surface to prevent evaporation, and has a structure in which water inlets are formed at appropriate locations on this synthetic resin sheet. Adopted.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Fig. 1 explains one embodiment of the present invention, and what is indicated by the reference numeral 1 in the figure is water-absorbing paper, which has a water-absorbing polymer as its main component and pulp is mixed therein to form a sheet of a predetermined thickness. It is shaped into a shape and has the ability to absorb water several hundred times its own weight.

A synthetic resin sheet 2 made of polyethylene or the like is integrally adhered to the upper surface of this water-absorbing paper 1.

A water inlet 3 is formed using a suitable location of the synthetic resin sheet 2, such as a corner.

The water inlet 3 may have any arbitrary shape such as a quadrilateral or circular shape.

On the other hand, a shaped paper 4 is attached to the lower surface of the water-absorbing paper 1.
This shaping paper 4 is attached to adjust the shape of the water-absorbing paper 1 during molding, and is integrated with the water-absorbing paper 1 by, for example, embossing.

The curing sheet 5 is completed with such a three-layer structure.

As shown in FIG. 2, this curing sheet 5 is used in a rolled state having a predetermined width.

When using this curing sheet 5, after concrete is poured, the roll is unwound and tightened against the surface of the concrete with the shaping paper 4 facing downward.

When this concrete is laid, 1. It absorbs moisture from the poured concrete and becomes heavy, so a relatively large frictional force acts between the bottom surface of the curing sheet 5 and the concrete, so that it does not shift.

After laying the curing sheet 5, when water is injected from the water inlet 3 formed at an appropriate location on the synthetic resin sheet 2 using a hose or the like, the water-absorbing paper 1 made of a water-absorbing polymer weighs several hundred times its own weight. The water is rapidly absorbed by capillary action, resulting in a sufficiently moist state, allowing for reliable moist curing.

The entire weight of the curing sheet 5 that has absorbed enough moisture in this manner is quite large, so it will not be blown away by a slight breeze.

In addition, since the water inlet 3 formed in the synthetic resin sheet 2 is small compared to the area of the synthetic resin sheet 20, evaporation of water can be minimized, and direct sunlight and rain can be prevented and the concrete surface can be It can prevent cracks and deformation caused by raindrops.

After moist curing is performed in this way for several days, the curing sheet 5 must be removed, but by winding the synthetic resin sheet 2 into a roll from one end, even if the curing sheet 5 Even if a portion of the curing sheet 5 is attached to the concrete surface, since the attached portion is water-absorbing paper, the entire curing sheet 5 can be peeled off from the concrete surface extremely easily while leaving this attached portion on the concrete surface. There is only a small amount of water-absorbing paper 1 attached to the concrete surface, and it can be easily removed with a shovel or the like.

Further, the curing sheet 5 after removal can be discarded as a disposable one, and there is no need to remove the concrete attached to it.

In this way, a curing sheet can be obtained that is easy to apply and remove, and which can perform extremely excellent wet curing.

It goes without saying that the shape of the water inlet 3 formed in the synthetic resin sheet 2 may be formed as a slit 6 having a slight width as shown in FIG.

Further, the shaping paper 4 is not necessarily necessary. Furthermore, if there is a risk that the curing sheet may peel off due to strong winds, etc., the edges of the curing sheet may be held down with an appropriate member, or the adjacent curing sheets 5 may be wrapped with adhesive tape 7 as shown in FIG. It may be fixed.

As is clear from the above explanation, the present invention has a structure of at least two layers: a water-absorbing paper made mainly of water-absorbing polymer, and a synthetic resin sheet pasted on the top surface of the water-absorbing paper, and a synthetic resin sheet Since the water injection paper has an opening for water injection, through this opening, the water injection paper absorbs water several hundred times its own weight, ensuring moisture curing, and preventing the synthetic resin sheet from direct sunlight or rain. You can minimize the evaporation of water from the absorbent paper.

Furthermore, since the curing sheet is wound into a roll, it can be laid down simply by rolling the roll, making installation extremely easy.

Also, since it is made of water-absorbing paper, removal and post-removal processing are extremely easy.

Excellent effects such as ease of operation can be obtained.

[BRIEF DESCRIPTION OF THE DRAWINGS] The figures are for explaining one embodiment of the present invention, in which Fig. 1 is an exploded perspective view of the curing sheet, Fig. 2 is a side view of the curing sheet rolled up, and Fig. 3 is a side view of the curing sheet. 4 is a perspective view showing another structural example of the synthetic resin sheet, and FIG. 4 is a perspective view of the construction state. 1... Water-absorbing paper, 2... Synthetic resin sheet, 3... Water inlet, 4... Shaping paper, 5...
...Curing sheet, 6...Slit, 7
...adhesive tape.

Claims (1)

[Scope of Claim for Utility Model Registration] ■) Water-absorbing paper made of water-absorbing polymer as a raw material and formed into a belt shape with a predetermined thickness and width, which absorbs water and performs wet curing during curing of concrete; 1. A concrete curing sheet comprising a synthetic resin sheet pasted over the entire surface of the concrete, and a part of the synthetic resin sheet having a small opening for water injection formed at a predetermined position. 2) The concrete curing sheet according to claim 1, wherein the water-absorbing paper is formed by mixing a water-absorbing polymer and pulp. 3) The concrete curing sheet according to claim 1 or 2, characterized in that shaping paper is adhered to the entire lower surface of the water supply paper.