JPS62182364A - Method for water holding ageing of concrete - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for water retention and curing of concrete, which enables early demolding of formwork after concrete is poured.

(b), Conventional technology Normally, when concrete is poured, if the formwork is removed early, the moisture contained in the concrete evaporates, causing drying shrinkage, which is a disadvantage in that the expected strength cannot be achieved. There was. However, if the formwork is left unused for a long period of time, the formwork cannot be used for other purposes, so there is a drawback that efficient construction cannot be performed.

In addition, when constructing a superhigh-rise reinforced concrete building, ultrahigh-strength concrete is used for columns, etc., but this concrete requires more sufficient curing than normal concrete. As a countermeasure against this problem, a method is used to prevent the concrete from drying by sprinkling water on the surface of the concrete after demolding.

(C) 0 Problems to be Solved by the Invention However, with this method, the sprinkled water dries immediately, requiring repeated watering, which is not only time-consuming, but also creates excess water every time water is sprinkled. There is an inconvenience that the surrounding area becomes flooded with water.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, the present invention aims to provide a water retention curing method for concrete that allows early demolding of formwork and does not require the trouble and risk of water intrusion as in the case of watering. It is something.

(d) Means for solving the zero problem, that is, the present invention provides a sheet (6) in a form that covers the surface, and also provides water supply means (7, 10). 10) supplying water to the surface (5a),
It is constructed so that the surface of the poured concrete (5) is always kept in a moist atmosphere by the sea 1-(6), and the poured concrete (5) is cured.

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions on the drawings. The following r (el
The same applies to the column ``, action''.

(e) 0 effect With the above-described configuration, the present invention is capable of supplying sea +- (S) from the water supply means to the concrete surface (5a) to prevent the filtrate from evaporating, thereby improving the surface (5a). It acts to maintain a constantly moist atmosphere.

(r), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a diagram showing an example of a concrete cast object to which the concrete water retention and curing method according to the present invention is applied, and FIGS. 2 and 3 are diagrams showing another embodiment of the present invention.

As shown in FIG. 1, the concrete cast object 1 has a floor 2, and a steel frame 3 is erected on the floor 2. Steel frame 3
Up to the middle of the pouring concrete immediately after being demolded;・5
(Hereinafter, concrete that has just been demolded and has not yet been cured will be referred to as "cast concrete") is provided to cover the surroundings of the steel frame 3, and A sheet 6 made of non-woven fabric or other fibrous material capable of exhibiting capillary action was suspended from the upper end of the poured concrete 5 on the side of the concrete 5 where the formwork had been previously provided. It is provided in a shape that covers the poured concrete surface 5a. A water storage tank 7 filled with water 9 is provided below the sheet 6, and the lower end of the sheet 6 is immersed in the water 9 of the water storage tank 7.

Since the concrete to be poured 1 has the above-mentioned configuration, curing of the poured concrete 5 after early demolding of the formwork is performed by the sea I and 6 sucking up the water 9 in the water storage tank 7 through capillary formation. This is done by The sucked up water permeates the entire surface of the sheet 6, moistens the surface 5a of the poured concrete 50, and the sheet 6 further moistens the surface 5a of the concrete 50.
Since evaporation of water from the concrete 5 is prevented, the surface 5a is always kept in a moist atmosphere, and the poured concrete 5 is effectively prevented from drying and properly cured.

In addition, in the above-mentioned embodiment, the surface 5a of the poured concrete 5
As a means for supplying water, a case has been described in which a water storage tank 7 is installed below the sheet 6 and the water in the water storage tank 7 is supplied using capillary action. Various other methods can be considered. For example, the second
As shown in the figure, a water supply pipe 10 having a large number of water injection holes is arranged above the poured concrete 5, and water is supplied from the water supply pipe 10 between the sheet 6 and the surface 5a. It is also possible to do so. In this case, water flows down the surface 5a of the poured concrete 13-) using gravity, so the sheet 6
The material itself does not have the property of exhibiting capillary development. Therefore, a film-like sheet with high moisture resistance can be used, and concrete can be cured in a good atmosphere. As shown in the figure, the outside of the sheet 6 having the property of exhibiting capillary action is covered with a highly moisture-proof film-like sheet (it may be used alone or in a laminated combination with the sheet 6 capable of exhibiting capillary action). It is of course possible to cover it with

Furthermore, as shown in FIG. 3, a water storage concretion 7 is placed on top of the poured concrete 5, and water 9 is supplied from the concretion 7 to the entire surface of the sheet 6 using capillary action and a flow-down phenomenon due to its own weight. However, it is of course possible to configure the system so that water is supplied to the concrete surface 5a.

! gl, Effects of the Invention As explained above, according to the present invention, the sheet 6 is provided to cover the surface 5a of the demolded poured concrete 5, and the water in the water storage tank 7, water supply pipe 10, etc. A supply means is provided, water is supplied from the water supply means to the surface 5a, and the surface of the poured concrete 5 is always kept in a moist atmosphere by the sheet 6 to cure the poured concrete U-1-5. With this structure, even if the formwork is removed early, it is possible to prevent drying shrinkage of the concrete, and it is also less labor-intensive and unnecessary than the method using water sprinkling. The surrounding area will not be flooded with water.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a concrete cast object to which the concrete water retention and curing method according to the present invention is applied, and FIGS. 2 and 3 are diagrams showing another embodiment of the present invention. 5... Placed concrete 5a ・Surface 6 Sheet 7 ・Water supply means (water storage tank) 9... Water 10...Water supply means (water supply pipe) to Figure 1 2 figure

Claims (1)

[Scope of Claims] A water retention curing method for concrete in which the surface of demolded poured concrete is cured by keeping it in a moist state, comprising: providing a sheet to cover the surface; and providing a water supply means. A water retention curing method for concrete comprising: providing water to the surface from the water supply means, constantly maintaining the surface of the poured concrete in a moist atmosphere with the sheet, and curing the poured concrete. .