JPH1082011A - Concrete paving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the water permeability and water retention function of a paving surface coexist by scattering and kneading water to Portland cement, soil in which grain size is specified, and gravel, and laying ready-mixed concrete in which lumps are manufactured while using gravel as nuclei. SOLUTION: Portland-cement, gravel 2, sand 3, powdered soil 4, in which grain size is set in 0.5mm or less, and water are kneaded. Lumps 1 using gravel 2 as nuclei and having coatings, in which sand 3 and soil 4 are coagulated, are manufactured. When ready-mixed concrete under the state, in which the lumps are prepared, is laid, pushed lightly by a board, etc., and flattened, subbase course concrete consisting of the lumps 1 and clearances is formed. Accordingly, since the clearances are communicated mutually, water on surfaces reaches a ground surface through the clearances and can be permeated while partial water is absorbed to the sand 3 and soil 4 of each lump 1, and water can be retained. Retained water is evaporated gradually from the surface of a subbase course, and the temperarure rise of the subbase course can be inhibited when the temperature of the subbase course is elevated by direct sunlight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete pavement method, and more particularly to a pavement method provided with water permeability and water retention.

[0002]

2. Description of the Related Art In order to infiltrate rainwater falling on a pavement surface into the underground, it has been conventionally practiced to spread a permeable concrete block, pave with permeable concrete, or pave with permeable asphalt. .

[0003] Such a conventional pavement method having water permeability basically comprises a coarse aggregate having a particle size of about 5 to 20 mm as a main material, and a gap formed when the aggregate is spread on a roadbed. Various binders have been added to impart a water-permeating effect and to add strength as a roadbed.

[0004]

However, in the conventional pavement method having water permeability, the aggregate used is mainly composed of coarse aggregate, and water can be transmitted therethrough. Had no function.

[0005]

The pavement method according to the present invention comprises:
Water is sprayed and kneaded with a mixture of Portland cement, soil (fine powder having a particle size of 0.5 mm or less) and gravel, and the mixture is mixed with the gravel as a nucleus. It is a way to spread.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A concrete pavement method according to the present invention comprises a natural aggregate containing soil (fine powder having a particle size of 0.5 mm or less) or an aggregate containing soil generated by dismantling a concrete structure; cement; This is a pavement method in which water is kneaded to form a lump and the ready-mixed concrete is spread.

An experiment was conducted to obtain a mass of ready-mixed concrete from aggregate containing soil. First, a plasterer whose blades rotate while gradually adding 10% water by weight to a composition consisting of Portland cement: 20% soil (fine powder having a particle size of 0.5 mm or less): 80% But kneading was not possible. Then, during the kneading, gravel (particle diameter: 5 to 10 mm) was charged, and cement was additionally added, whereby a mass of ready-mixed concrete could be formed. From this, it became clear that, in addition to cement and soil, particles serving as cores of lumps were necessary. Then, when experiments were conducted at various mixing ratios based on such knowledge, it was found that the following examples were preferable.

(Example 1) Portland cement: 25% Coarse aggregate Gravel (particle size: 5 to 10 mm): 25% Fine aggregate Sand (particle size: 1 to 5 mm): 15% Fine powder soil (particle size: 0.1 to 1 mm) 5 mm or less): The mixture consisting of 35% was kneaded with a plasterer mixer for 3 minutes or more while adding 10% by weight of water little by little, and as shown in the sectional view of FIG. As a result, the sand 3 and the soil 4 were agglomerated to form a lump 1 having a coating having an average thickness of about 5 mm.

Example 2 The same compound as in Example 1 was kneaded with a mixer truck (agitator) for transporting ready-mixed concrete while gradually adding 10% by weight of water to the same mixture as in Example 1. As shown in the cross-sectional view of FIG. 1, the sand 3 and the soil 4 were agglomerated with the gravel 2 as a core, and the lump 1 having the coating of the sand 3 and the soil 4 could be formed. As described above, when the ingot was formed by the agitator, as the kneading time was increased, the thickness of the coating was increased and the large ingot 1 could be formed.

As in Examples 1 and 2, lumps can be formed by reducing the amount of water and adding soil as compared with ordinary mortar cement. In particular, if the water is atomized and added little by little during kneading, all the compounds can be formed into a lump.

The mass 1 of the ready-mixed concrete thus laid is spread on the ground and flattened with a spatula or a plate to flatten the mass 1 as shown in the sectional view of FIG.
And the gap 5 can be formed.

The gap 5 of the formed roadbed concrete is
Since they are in communication with each other, the water on the surface reaches the ground 7 via the gap 5 and performs a water-permeating action to permeate the ground 7.

Further, a part of the water is absorbed by the agglomerated sand 3 and the soil 4 of each lump 1 and retained. Then, the retained water gradually evaporates from the surface of the roadbed. Especially,
When the temperature of the roadbed rises due to direct sunlight, the temperature rise of the roadbed can be suppressed by evaporation of water.

When the physical characteristics of the roadbeds formed in Examples 1 and 2 were examined, the porosity of the roadbed was 27%, and the dry density was 1.537 kg /
m ³ , the wet density is 1,726 kg / m ³ ,
The water content was about 12.3%, and the water retention was found to be 97% even after 24 hours.

When it is desired to protect the surface of a roadbed paved with a lump of ready-mixed concrete or to obtain an aesthetic appearance, a permeable color flat plate is laid or a resin-based permeable pavement is used. What is necessary is to do.

[0016]

As is clear from the description based on the above embodiment, according to the concrete pavement method of the present invention, the conventional roadbed concrete is mixed with soil which should not be mixed. Since a relatively large lump can be formed and paved, a water-permeable effect equivalent to that of conventional permeable concrete pavement can be obtained, and
It has a water retention effect and can suppress a rise in the temperature of the roadbed due to evaporation of the retained water.

As the aggregate used in the pavement method of the present invention, it is possible to utilize recycled aggregate including mountain sand and soil generated by dismantling concrete structures. In addition, a mixer for plastering and a mixer truck that transports ready-mixed concrete, which has been widely used, can be used as it is, and no special device is required.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a concrete lump used in the concrete pavement method of the present invention;

FIG. 2 is a sectional view of a concrete roadbed formed by the pavement method of the present invention.

[Explanation of symbols]

 1 lump 2 gravel 3 sand 4 soil 5 gap 7 ground

Claims (1)

[Claims] 1. A mixture of Portland cement, soil (fine powder having a particle size of 0.5 mm or less), and gravel is sprayed with water and kneaded, and the mixture is lumped using the gravel as a nucleus. A pavement method characterized by spreading ready-mixed concrete.