JPH10194818A - Production of high strength water permeable concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain high strength concrete having water discharging performance, sound absorbing property, antislipping effect and water permeability by blending and kneading Portland cement with #7 macadam, #6 macadam, a binder, a pigment and water in a specified ratio and carrying out concrete placing or press hardening with a form on a surface to be paved. SOLUTION: A concrete mixture is prepd. by blending 350-400kg Portland cement based on 1m<3> of the mixture with 90-1001 water, 750-800kg #7 mecadam, 800-850kg #6 macadam, 1.5-2.0kg binder and 10-15kg pigment. The #7 macadam and #6 macadam area aggregate and preferably have a Mohs hardness of >=6 and >=700kgf/mm<2> Knoop hardness. By the aggregate, the objective water permeable concrete having a large void volume and high strength is obtd. The binder is an inorg. binder such as anhydrous gypsum or kaolin or an org. binder such as resin latex.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete material, and more particularly to a concrete material having high strength and water permeability as a structure having a drainage property, a sound absorbing property and an anti-slip property.

2. Description of the Related Art Conventionally, concrete has been widely used as a floor material for buildings and outdoor facilities. However, when using these conventional ones, for example, in parks, sidewalks of hills, poolside, underpasses, baths, parking lots, station yards, etc., there is no water permeability, i.e., no water absorption or drainage. There have been various drawbacks, such as the formation of water pools on the surface, which makes the vehicle slippery, and the lack of sound absorption causes noise from passing vehicles. In recent years, accidents caused by the above-mentioned defects have frequently occurred, and this has become a serious social problem.

[Problems to be Solved by the Invention] The material of the high-strength water-permeable concrete of the present invention is a commonly used material for concrete.
The main material is crushed stone having a relatively narrow range within the particle size range of the crushed stone and the crushed stone. In order to impart strength after molding to the crushed stone material sized to a predetermined particle size, one or two or more of known inorganic binders and organic binders are used in an amount of 0.4 to 0.5% with respect to cement. Add. If the amount of water to be added exceeds 0.5 part by weight per 1 part by weight of cement, the water permeability of concrete deteriorates, while
When the amount is less than parts by weight, it is difficult to perform sufficient kneading.
It was determined to be 0.27 parts by weight. Adding a ceramic pigment or using a color glaze for the purpose of coloring the product is effective in enhancing the aesthetics after the product is installed. Also, by adding 0.4 to 0.5 parts by weight of special binder to cement, the strength exceeds that of ordinary concrete secondary products. By limiting the aggregate to No. 7 crushed stone and No. 6 crushed stone, the interparticle space between the material particles is controlled, whereby the porosity is 10 to 13% and the water permeability is 0.17 Cm.
/ Sec or more. In addition, No. 7 crushed stone, 6
By using the crushed stone, the surface condition of the product can be made uniform and rough, whereby the coefficient of friction of the surface can be increased and the slip caused by water can be reduced. Further, by setting the porosity to 10 to 15%, the incident sound absorption coefficient becomes 700.
An effect of 60% or more is obtained at 5,000 Hz, which helps to prevent noise.

[Means for Solving the Problems] As the cementitious substance used in the present invention, various kinds of ordinary, early-strength, ultra-high-strength and white Portland cement are used. Further, low heat cement, sulfate resistant cement, alumina cement and the like can also be used. In the present invention, the aggregate refers to a crushed stone No. 7 or a crushed stone No. 6, and it is preferable to use an aggregate selected according to a rule having a Mohs hardness of 6 or more or a Knoop indenter hardness of 700 Kgf / mm ² or more in terms of strength. . Thereby, when molded in a pressurized state, a permeable concrete having a high porosity filling structure and high strength can be manufactured. Examples of inorganic binders used as the binder include porcelain powder such as anhydrous gypsum powder, kaolin and feldspar, blast-furnace granulated slag powder, powder discharged from a silica stone manufacturing plant, and various alumina-based compound powders. Various resins can be used in the form of latex as the organic binder. Further, formalin polymers are also suitable. These are indispensable additives for maintaining high strength, and the mixing range is 0.4 to 0.5% with respect to cement. The ratio of cement to water (W / C) is one of the major factors that determine the performance of permeable concrete. If W / C is small, the bonding between the aggregates is weakened, and the strength becomes practically insufficient.
On the other hand, if W / C is too large, the gap between the aggregates is filled with cement, and the water permeability becomes insufficient. Therefore, in the present invention, W / C is set to 0.24 to 0.27. According to this value, the product has high water permeability and sufficient bending strength, and its water permeability and high strength change over time is extremely small.

[Action] The product obtained according to the present invention exhibited high strength and excellent water permeability. The product of the present invention had a water permeability coefficient of 0.16 to 0.17 Cm / sec with respect to the water permeability interlocking standard of 0.01 Cm / sec. In the compression strength test (28 days of material age), it was 150 kgf / Cm ² or more, and in the bending strength test, it was 49.1 kgf / Cm ² (pavement design standard: 45 kgf / Cm ² ), and each test reached the reference value. The porosity of the product of the present invention is 12% to 6-8.
It seems that the strength test value is further increased by lowering the strength test value. Therefore, from the above test results, it is an excellent product that can be sufficiently used as an interlocking block and for concrete pavement, and is practically used as a product that is kind to nature, protects groundwater, and considers natural ecosystems. .

[EXAMPLES] An example of the compounding ratio of the material according to the present invention is as follows. Cement (C) 400 kg Water (W) 971 No. 7 crushed stone 770 kg No. 6 crushed stone 810 kg Binder 1.9 kg (silica powder, formaldehyde condensate) Pigment 12 kg W / C = 24.3% Just put it in and press it temporarily or continuously and leave it lightly under pressure, and it is possible to obtain a sidewalk pavement material that has sufficient water permeability as specified, is easy to walk and is non-slip, and is easy in terms of equipment and labor. It can mass produce high-strength, safe and high-performance products. The measured hydraulic conductivity, bending strength, and compressive strength were as follows. Permeability 0.17 cm / sec flexural strength 49.1kgf / cm ² compressive strength 0.99 kgf / cm ² or more (wood age 28
D) Other measured values are shown below. Porosity 12.0% Span 16.0cm

[Effects of the Invention] The high-strength water-permeable concrete according to the present invention provides a high-strength hardened body, which was impossible with conventional techniques, and can easily maintain water permeability, and is excellent in various application aspects. It can be used as a molded material.

Claims (1)

[Claims] Concrete mixture 1m ³ per, 350~400kg
Portland cement, 90-100 l water, 750
These are mixed and kneaded with a concrete mixture consisting of a crushed stone No. 7 of 800 to 850 kg, a crushed stone of 800 to 850 kg, a binder of 1.5 to 2.0 and a pigment of 10 to 15 kg. A method for producing concrete having high strength and high water permeability by casting on a pavement surface or by pressurizing and hardening at a pressure of 5 to 10 kg / Cm ^{2 in} a formwork.