JP7661198B2 - Concrete curing mat - Google Patents

Description

One embodiment of the present invention relates to the structure of a concrete curing mat used for curing concrete.

Concrete develops its strength through the hydration reaction between cement and water, which forms bonds with the aggregate. If there is a lack of water during the hydration reaction due to wind or temperature, the reaction may not proceed sufficiently, and the expected strength may not be achieved, or plastic shrinkage cracks may occur. For this reason, it is important to cure the concrete after pouring, such as by keeping it moist to prevent water loss, in order to promote the hardening and strength development of the concrete.

When curing concrete, a curing mat is used to cover the surface of the concrete. There are various types of concrete curing mats, but for example, a concrete curing mat has been disclosed in which a moistening material that swells by absorbing water is placed on the concrete surface of the base material in order to increase adhesion to the concrete surface and retain moisture for a long period of time (see Patent Document 1).

JP 2002-081210 A

The concrete curing mat disclosed in Patent Document 1 is said to be able to cure concrete for a long period of time by having multiple moistening materials arranged on the concrete surface absorb moisture, expand, and deform to fill the gaps between adjacent materials. However, the moistening materials are covered by the base mat and are therefore not visible, so there is a problem in that the degree of dryness of the moistening materials cannot be easily determined from the outside.

In view of these problems, one embodiment of the present invention aims to provide a concrete curing mat that allows the degree of dryness to be easily grasped.

The concrete curing mat according to one embodiment of the present invention comprises a base mat having at least one through hole and a water-absorbing and expanding member provided in the through hole, the water-absorbing and expanding member being exposed on a first surface of the base mat and a second surface opposite the first surface.

In one embodiment of the present invention, a gap may be formed between the water-absorbent expansion member and at least one through hole when the water-absorbent expansion member dries, and a protrusion that can be caught by the base mat may be provided on the exposed portions of the first and second surfaces of the water-absorbent expansion member. The at least one through hole may be composed of a plurality of through holes, the plurality of through holes may be provided at a distance from each other in the base mat, and a water-absorbent expansion member may be provided in each of the plurality of through holes.

In one embodiment of the present invention, the water-absorbing expansion member may be water-expandable rubber, and the expansion direction of the water-absorbing expansion member may have expansion anisotropy.

According to one embodiment of the present invention, a water-absorbing expansion member is provided so that it penetrates the base mat, making it easy to grasp the degree of dryness while curing the concrete, and allowing for proper curing without depleting the moisture.

1A and 1B are plan views of a concrete curing mat according to an embodiment of the present invention, in which (A) shows a configuration according to a first embodiment, and (B) shows a configuration according to a second embodiment. 1A and 1B show cross-sectional views of a concrete curing mat according to one embodiment of the present invention, in which (A) shows a cross-sectional structure corresponding to the section A-B shown in FIG. 1A, and (B) shows a cross-sectional structure corresponding to the section C-D shown in FIG. 1B. 1 shows a cross-sectional structure of a concrete curing mat according to one embodiment of the present invention, where (A) and (B) show the configuration according to a first embodiment, and (C) and (D) show the configuration according to a second embodiment.

The following describes the embodiments of the present invention with reference to the drawings. However, the present invention can be implemented in many different ways, and should not be interpreted as being limited to the description of the embodiments exemplified below. In order to clarify the explanation, the drawings may show the width, thickness, shape, etc. of each part in a schematic manner compared to the actual embodiment, but these are merely examples and do not limit the interpretation of the present invention. In this specification and each figure, elements similar to those described above with respect to the previous figures may be given the same reference numerals (or reference numerals with A, B, a, b, etc. suffixed thereto) and detailed explanations may be omitted as appropriate. Furthermore, the letters "first" and "second" suffixed to each element are convenient labels used to distinguish each element, and have no further meaning unless otherwise specified.

[First embodiment]
FIG. 1A shows a plan view of a concrete curing mat 100A according to the first embodiment. The concrete curing mat 100A includes a base mat 102 and a water-absorbing expansion member 106a. The base mat 102 has a first surface 10 and a second surface 20 opposite to the first surface 10, and is a mat that is spread and laid on a concrete surface. The base mat 102 has at least one through hole 104 that penetrates from the first surface 10 to the second surface 20. A water-absorbing expansion member 106a is provided in the at least one through hole 104. The water-absorbing expansion member 106a is provided so as to be exposed to the first surface 10 and the second surface 20 of the base mat 102.

It is preferable that a plurality of through holes 104 are provided in the base mat 102. It is preferable that the plurality of through holes 104 are arranged so as to be spaced apart from one another and spread across the entire surface of the base mat 102. It is also preferable that each of the plurality of through holes 104 is provided with a water-absorbing expansion member 106a as described above.

There is no limit to the dimensions of the base mat 102, and it may be cut to 900 mm in length and 1800 mm in width, or it may be provided in a rolled state. There is no limit to the size of the through holes 104, and they may be of an appropriate size as long as they do not impair the strength of the base mat 102. For example, the through holes 104 are formed in a circular shape with a diameter of 20 mm to 40 mm. There is no particular limit to the number of through holes 104 (in other words, the number of water-absorbing expansion members) provided in the base mat 102, but it is preferable to provide about 10 to 100 per square meter.

There are no particular limitations on the material and structure of the base mat 102. The base mat 102 is preferably formed of a material capable of suppressing the evaporation of moisture, or has a structure capable of suppressing the evaporation of moisture. For example, the base mat 102 may be a mat in which a non-breathable sheet and a non-woven fabric or woven fabric are laminated. The base mat 102 may be a mat in which a non-woven fabric or woven fabric is stretched on the second surface 20 that faces the concrete, a non-breathable resin sheet is stretched on the first surface 10 that faces the outside, and a foamed resin sheet is sandwiched between the two.

The water-absorbing expansion member 106a is a member that expands in volume by absorbing water. For example, water-expanding rubber is used as the water-absorbing expansion member 106a. Water-expanding rubber is a composite of a rubber-based basic material and a water-absorbing material, and the degree of expansion can be adjusted appropriately by combining the type and amount of water-absorbing material, and it can be molded into any shape.

The cross-sectional structure between A and B shown in FIG. 1(A) is shown in FIG. 2(A). FIG. 2(A) shows a partial cross-sectional structure of the concrete curing mat 100A when the water-absorbing expansion member 106a is dry. As described above, the base mat 102 is provided with a through hole 104, and the water-absorbing expansion member 106a is attached so as to be fitted into the through hole 104. The water-absorbing expansion member 106a is attached so as to pass through the through hole 104 and be exposed on the first surface 10 and the second surface 20 of the base mat 102.

As shown in FIG. 2(A), when the water-absorbing expansion member 106a is dry, it is preferable that there is a gap between the through-hole 104 and the water-absorbing expansion member 106a. The water-absorbing expansion member 106a expands in volume when it absorbs water, so if there is no gap between the through-hole 104 when it is dry, the expansion in volume when it absorbs water may cause the base mat 102 to deform, making it impossible to lay it flat on the concrete surface. Therefore, by making sure there is a gap between the water-absorbing expansion member 106a and the through-hole 104 when it is dry, in anticipation of the expansion in volume, problems associated with the expansion in volume can be eliminated.

The water-absorbing expansion member 106a may be provided so as to protrude from both the first surface 10 and the second surface 20 of the base mat 102, and may have a shape in which a eaves-like protrusion 108 is provided on the protruding portion. The protrusion 108 protrudes outward from the through hole 104, so that the water-absorbing expansion member 106a does not fall out of the base mat 102. In other words, the water-absorbing expansion member 106a has an H-shape (or an "E" shape) in cross section, and the portion that becomes the protrusion 108 protrudes outward more than the through hole 104, so that the water-absorbing expansion member 106a can be maintained in a state of being inserted into the through hole 104 of the base mat 102.

Figure 2 (B) shows a partial cross-sectional structure of the concrete curing mat 100A when the water-absorbing expansion member 106a absorbs water and expands. When the water-absorbing expansion member 106a absorbs water, it expands in the same direction, and the water-absorbing expansion member 106a protrudes from the base mat 102, and the change can be confirmed in appearance.

Figures 3(A) and (B) show the state in which a concrete curing mat 100A is laid on the concrete surface when curing a concrete member 200. Figure 3(A) shows the state in which the water-absorbing expansion member 106a is dry, and Figure 3(B) shows the state in which the water-absorbing expansion member 106a has expanded due to water absorption.

The water-absorbing expansion member 106a is attached so as to penetrate from the first surface 10 to the second surface 20 of the base mat 102, so that when the concrete curing mat 100A is laid on the concrete member 200, it is positioned so as to be in direct contact with the concrete surface. The concrete curing mat 100A expands from a state in which the water-absorbing expansion member 106a is dry as shown in FIG. 3(A) by spraying water and absorbing moisture contained in the concrete member 200, and becomes deformed so that the water-absorbing expansion member 106a protrudes from the base mat 102 as shown in FIG. 3(B). After expanding by absorbing water, the water-absorbing expansion member 106a shrinks again when the concrete surface dries, and returns to its original size as shown in FIG. 3(A).

The shape of the water-absorbing expansion members 106a of the concrete curing mat 100A changes depending on the wetness of the concrete member 200, and this change is visible on the outside, so the degree of dryness of the area to be wet cured can be visually ascertained. By arranging the water-absorbing expansion members 106a at intervals across the entire surface of the base mat 102, unevenness in the degree of dryness can be visually ascertained even if the area to be wet cured of the concrete member 200 covers a wide area. This allows the contractor to ascertain areas that require watering, etc., and take appropriate measures.

[Second embodiment]
1B shows a plan view of a concrete curing mat 100B according to the second embodiment. The concrete curing mat 100B according to the second embodiment has a different characteristic of the water-absorbing expansion member 106b from that shown in the first embodiment. In the following description, the differences from the first embodiment will be mainly described, and overlapping descriptions will be omitted as appropriate.

The concrete curing mat 100B includes a base mat 102 and a water-absorbing expansion member 106b. The base mat 102 is provided with a through hole 104, and the water-absorbing expansion member 106b is attached so as to be exposed to the through hole 104.

The water-absorbing expansion member 106b in the second embodiment has anisotropy in the direction of expansion when it absorbs water. That is, while the water-absorbing expansion member 106a in the first embodiment has no anisotropy in the direction of expansion and expands in an isotropic manner, the water-absorbing expansion member 106b in the second embodiment has a property that the expansion rate in a specific direction is greater than the expansion rate in other directions.

The cross-sectional structure between C and D shown in FIG. 1(B) is shown in FIG. 2(C). FIG. 2(C) shows a partial cross-sectional structure of the concrete curing mat 100B when the water-absorption expansion member 102b is dry. The water-absorption expansion member 106b is attached so as to fit into the through-hole 104 provided in the base mat 102. At this time, the water-absorption expansion member 106b may be fitted into the through-hole 104 without any gap. The water-absorption expansion member 106b may have a certain amount of gap as in the first embodiment. In this case, the water-absorption expansion member 106b may be bonded to the base mat 102 with an adhesive or the like. The shape of the water-absorption expansion member 104b is arbitrary, but it may have a shape that is inserted into the through-hole 104 from the second surface 20 of the base mat 102 and has an upper part that is approximately flush with the first surface 10 when dry.

Figure 2 (D) shows a partial cross-sectional structure of the concrete curing mat 100B when the water-absorbing expansion member 106b absorbs water and expands. When the water-absorbing expansion member 106b absorbs water, it expands mainly in one direction (the thickness direction of the base mat 102), and the upper part of the water-absorbing expansion member 106b deforms so that it protrudes from the first surface 10 of the base mat 102.

Figures 3(C) and (D) show the state in which a concrete curing mat 100B is laid on the concrete surface when curing a concrete member 200. Figure 3(C) shows the state in which the water-absorbing expansion member 106b is dry, and Figure 3(D) shows the state in which the water-absorbing expansion member 106b has expanded due to water absorption.

The water-absorbing expansion member 106b expands in one direction from a dry state as shown in FIG. 3(C) by sprinkling water on the concrete surface and by absorbing moisture contained in the concrete member 200, and deforms so that its upper portion protrudes from the base mat 102 as shown in FIG. 3(D). After expanding by absorbing water, the water-absorbing expansion member 106b contracts again when the concrete surface dries, returning to its original size as shown in FIG. 3(C).

In the concrete curing mat 100B, the shape of the water-absorbing expansion member 106b changes in one direction depending on the wet state of the concrete member 200, and this change appears externally as a shape that protrudes from the base mat 102, so the degree of dryness of the area to be wet cured can be grasped visually. By arranging the water-absorbing expansion members 106b at intervals over the entire surface of the base mat 102, it is possible to visually confirm the unevenness of the degree of dryness even if the area to be wet cured of the concrete member 200 covers a wide area. This allows the contractor to understand the areas that require watering, etc., and to take appropriate measures.

100A, 100B: concrete curing mat, 102: base mat, 104: through hole, 106a, 106b: water-absorbing expansion member, 108: protrusion, 200: concrete member

Claims (6)

a substrate mat having at least one through hole;
A water-absorbing expansion member provided in the at least one through hole;
having
A concrete curing mat, characterized in that the water-absorbing expansion member is exposed on a first surface and a second surface opposite to the first surface of the base mat. The concrete curing mat according to claim 1, in which a gap is formed between the water-absorbing expansion member and the at least one through hole when the water-absorbing expansion member dries. The concrete curing mat according to claim 1 or 2, wherein the exposed portions of the first surface and the second surface of the water-absorbing expansion member are provided with protrusions that hook onto the base mat. the at least one through hole comprises a plurality of through holes;
The plurality of through holes are provided at intervals in the base mat,
4. The concrete curing mat according to claim 1, wherein the water-absorbing expansion member is provided in each of the plurality of through holes. The concrete curing mat according to any one of claims 1 to 4, wherein the water-absorbing expansion member is water-expanding rubber. The concrete curing mat according to claim 1 , wherein the expansion direction of the water-absorbent expansion member is anisotropic.

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