JPH11226931A - Water permeable block for road surface and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excellent appearance and a large anti-slip effect by washing cement on a surface of a stiff-consistency cement composition made of an aggregate and a cement to form a protrusion and recess part in which the aggregate is partly protruded. SOLUTION: A stiff-consistency cement composition A1 made of small particle aggregate 1 such as a natural stone, an artificial stone or the like is used. First, a sheet (hardening retarded sheet) coated with a cement hardening retarder is laid in a form. Then, the composition A to become a surface layer of a product is charged in a predetermined thickness such as, for example, 10 to 40% of an overall volume of the form. Further, a stiff-consistency first cement composition to become a base layer is charged in an overall volume, regulated in charging, and two layers of cement composition is formed in the same form. This is formed integrally in two layers by a pressure by a pressure molding machine, and immediately released from its mold to a cement composition adhered with a hardening retarded sheet to the surface layer. And, an unsolidified part of its surface A1' is rubbed by a brush or the like at the aggregate 1 in the composition and washed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road permeable block and a method for producing the same.

[0002]

2. Description of the Related Art Permeable blocks for road surfaces have been widely used in recent years as paving materials for streets for protecting and growing plants.
Because of the emphasis on the water-permeability function, it is difficult to devise an aesthetic appearance on the surface, and it is difficult to polish the surface, and the polished surface is easily slippery and has a walking problem.

[0003] The present invention has been made with the object of providing a water-permeable block for a road surface which avoids such conventional disadvantages.

[0004]

Means for Solving the Problems The surface of a stiffened cement composition composed of aggregates such as natural stones and artificial stones and cement is made to have an irregular shape in which the cement is washed out and the aggregates partially protrude. In order to obtain the product, a natural cement, an aggregate such as artificial stone and cement and a cement mixture obtained by mixing cement in an appropriate ratio are filled in a mold, and a cement setting retarder is added to the surface of the cement cement composition. Immediately after forming a layer, the basic means is to wash out the cement on the surface side of the cemented cement composition together with the cement setting retarder, and as a means for washing out the surface, a brush or a high pressure spray is used. It was done.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, A is a road-permeable block according to the present invention, and block A is a small-grain aggregate 1 such as natural stone or artificial stone.
Are solidified by the cement 2 and a part of the aggregates 1 mixed into the composition A1 by washing and finishing the surface A1 ′ of the stiffened cement composition A1 having 10 to 70% continuous voids. Is an irregular shape projecting from the surface A1 '.

[0006] The block A is formed from a natural cement, an artificial stone or the like using a cement setting retarder in the surface layer of a stiffened cement composition, molded by a pressure molding machine, and immediately demolded. It is obtained by washing efficiently with water and producing it. The method of manufacture is described as follows. A paper coated with a prepared cement setting retarder (hereinafter, referred to as a setting delay paper) is laid in a mold, and then 10 to 40% of the total volume of the mold
It is charged to a certain thickness, and further, the entire volume of the first cement composition, which is to be a base layer, is charged thereon, and the filling is adjusted, and a two-layer cement composition is formed in the same mold, and pressure molding is performed. Two layers are integrally formed by pressure using a machine, and then immediately removed from the mold to form a cement composition (hard water permeability is determined by the mixing ratio of the aggregates, cement, etc. constituting the composition) with the hardening delay paper attached to the surface layer. obtain. The hardening delay paper prepared at this time is cut to the target block size. It can also change the washing depth depending on the size of the aggregate used as the surface layer. Since the cement setting retarder applied to the setting delay paper is water-soluble, it penetrates evenly into the adhering portion of the surface of the cement composition during molding, and the permeated portion causes the cement setting delay for a certain period of time. Since the other cement composition that does not penetrate is hardened by the ordinary cement hydration reaction, this property is used to scrub out the unconsolidated portion of the surface layer with water using a brush or the like to wash the aggregate in the composition. The delayed setting of the cement setting retardant is about 30 minutes, depending on the conditions.
Since the molded product obtained by the present production method lasts for up to 40 hours, the molded product obtained by the present production method can be washed and finished from the time when the cement composition portion where the setting retarder has not penetrated is hardened.

[0007] The method of washing and finishing is to rub the surface of the unhardened surface with a brush with a retarder of a molded article moving on a conveyor under a rotating brush with water and exposing the aggregate.

However, before the scrubbing with a brush, the hardening delay paper adhering to the surface layer of the block is peeled off.

As another washing method, the uncured portion of the molded article is sprayed with water from below using a high-pressure washing machine,
There is also a method of exposing the aggregate. According to this method, there is no possibility that the hardened material such as the washed-out cement enters the continuous voids, and the water permeation function of the product is reliably maintained.

[0010] As a result, the uncured mortar portion is washed away, and uniform aggregates are exposed. At this time, the mortar to be washed out fills the voids in the block and reduces the water permeability by brush washing. In this case, in this case, the washing for performing the washing operation in the block gap is performed by back-washing the block in a water tank with the surface of the block facing down.
The method of backwashing is to blow the air into a water tank and wash the block while bubbling water. In this way,
Furthermore, it becomes a block with good water permeability.

Thereafter, after sufficient cement hardening of the block, a water-permeable block washed and finished can be obtained.

Incidentally, the water permeability of the block A can be obtained by appropriately selecting the mixing ratio of the aggregate and the cement (Japanese Patent Publication No. 57-34238).

[0013] Next, examples of blending of the cement composition are shown below. The composition is a formula composition (Kg / m3).

Example 1 Surface Layer Formulation Natural crushed stone Ordinary Portland Water (12-6 m / m) Cement 2000 334 93 Example-2 Surface layer formulation Artificial crushed stone White Portland Water Color pigment (12-5 m / m) Cement 1965 327 97 6.5 Example-3 Surface formulation C.I. Natural crushed stone Ordinary Portland Water (7 to 5 m / m) Cement 1934 360 102 Example-4 Surface formulation Artificial crushed stone Ordinary Portland Water (4-2 m / m) Cement 1957 365 100 Laying specified cement hardening delay paper in press forming machine formwork (Table 1) and then putting surface layer compound according to the example (Table 1) This was homogenized, and the base layer composition described in Example 5 was charged on the mold until the entire volume of the mold was formed, and then compressed (pressurized) and immediately demolded to form a water-permeable block. obtain. After that, steam curing (about 60 ° C x 4 hours) is performed and the hardened state of the part (mainly the base layer) where the cement setting retarder does not penetrate is observed. The portion which has not yet hardened due to the delay in curing is washed out, and the inside of the block is washed to obtain a water-permeable block.

Example-5 Composition of Base Layer Natural Crushed Stone Normal Portland Sand Water (6-4 m / m) Cement (common to each surface layer) 1619 460 211 140

[0016]

[Table 1]

The water-permeable block (product size: 300
× 300 × 60 m / m) The bending strength and water permeability of 28 days after molding are shown in Table 2, and the relationship between the bending strength and water permeability of the water-permeable block obtained in this test is shown in FIG. .

[0018]

[Table 2]

[0019]

According to the present invention, it is possible to provide a product which is excellent in appearance and has no difficulty in walking, and is manufactured by exposing a natural aggregate and an artificial aggregate by washing and finishing the surface of a block having a water permeable function. Are formed in irregularities, and a road surface material having a great anti-slip (non-slip property) effect due to the aesthetic appearance of the exposed aggregate and the projection can be obtained. In this case, if a colored aggregate is used, the road surface material will be more excellent in aesthetic appearance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a water-permeable block on a road surface.

FIG. 2 is a diagram showing the relationship between bending strength and hydraulic conductivity.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aggregate 2 Cement A1 Hardened cement composition

Claims (4)

[Claims] 1. A road-permeable block for a road surface, wherein the surface of a stiffened cement composition comprising an aggregate such as natural stone or artificial stone and cement is formed into an uneven shape in which the cement is washed out and the aggregate partially projects. 2. A mold frame is filled with a cement mixture obtained by mixing an aggregate such as natural stone or artificial stone and cement in an appropriate ratio, and a cement setting retarder is layered on the surface of the cement mixture. A method for producing a water-permeable road surface block, comprising immediately removing the mold and washing out the cement on the surface side of the hardened cement composition together with the cement setting retarder. 3. The method according to claim 2, wherein the surface of the cement composition is washed out with a brush while supplying water. 4. The method for producing a water-permeable road surface block according to claim 2, wherein the surface of the cement composition is turned downward, and water is sprayed on the surface using a high-pressure washing machine to wash out the surface. .