JPH03279503A - Roadbed and its material - Google Patents

Abstract

PURPOSE:To obtain a roadbed having sufficient strength while combining with the recycling of waste material by crushing the waste material such as concrete or asphalt into a given or less grading to be a granular body, and adding a coagulant to a mixture of the granular body at a given ratio. CONSTITUTION:A roadbed is formed by crushing waste material such as concrete and asphalt into a granular body having an dout 10mm or less size, and solidifying the mixture of the granular body with portland cement. Though the uniaxial compression strength or the breaking deformation of the roadbed varies by the adding quantity of the portland cement, the adding ratio of the portland cement is made about 4% or more for obtaining a roadbed having an uniaxial compression strength of about 10kgf/cm<2> or more. This can eliminate the need for the direct cost for roadbed material, and conduct low-cost roadbed construction.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to roadbeds and materials for roadbeds.

[Prior Art 1 Roadbed is a part that plays an important role in distributing traffic load and transmitting it to the roadbed, and it is made of a material that has sufficient bearing capacity and is highly durable and is tightened to the required thickness. It must be solid.

By the way, conventional roadbed materials include cut gravel and cut crushed stone, which are solidified with cement to form the roadbed, but cut gravel and cut crushed stone are purchased from vendors.
Material costs are high.

Purpose of the present invention] The present invention utilizes damaged concrete waste from concrete buildings and drainage U-shaped ditches, roof tiles or brick waste, and damaged asphalt waste from roads. This makes it possible to provide a low-cost roadbed and its materials that can be used effectively, and also to prevent pollution caused by the disposal of waste materials by reusing the waste materials.

[Means of the present invention] The roadbed according to the present invention is made of a mixture of main material granules obtained by crushing concrete, roof tiles, or brick waste material to a desired particle size, and granules obtained by crushing asphalt waste material to a desired particle size, such as cement. The material used for this purpose is, as mentioned above, a mixture of crushed granules of concrete, tiles, or brick waste, and crushed granules of asphalt waste.

[Example] The strength of the road base is required to have l-axis compression of l kgf/cm2 or more.

In the present invention, a small amount of ordinary Portland cement is added as a coagulant to a mixture of concrete granules made by crushing concrete waste to a particle size of 10 layers or less, and a small amount of asphalt granules made by crushing asphalt waste to a particle size of 10 layers or less. A roadbed was constructed by adding water (about warm water) to solidify the mixture.

The l-axis compressive strength and fracture strain change depending on the amount of Portland cement added, and test examples are shown in the table below.

Table (1) Cement stabilization treatment l-axial compression test result table As can be understood from the above table (1), the uniaxial compressive strength is 10k.
In order to obtain a roadbed with gf/c 2 or more, the addition rate of Portland cement to the mixture of crushed granules of concrete waste and crushed granules of asphalt waste must be 4% or more.

In addition, the amount of cement added is as follows when expressed in weight per 11 parts.

The unit volume weight of the material is 1.407t/1, and the weight of cement when the addition amount is 2%, 4%, and 6% is: In the case of 2%, 1,407t/s3X O,02= 2
In the case of 8kg/c14%, 1,4θ7t/m3X 0.
04=58.3kg/cm36%, 1.407
t/s3×O,06=84.4kg/c1.

In the above example, crushed granules of concrete waste were used as the main material, but in addition, crushed tiles and brick waste, or a mixture of crushed granules of concrete, roof tiles, and brick waste may also be used. Even with these materials, we were able to obtain test results that were almost the same as those in Table (1).

For soft ground, an appropriate amount of lime may be added in addition to cement as an additive.

Further, the appropriate amount of asphalt waste mixed with the main material such as concrete waste is 30 to 50% by weight.

[Effects] As described above, according to the present invention, waste concrete, waste bricks and tiles from buildings, and waste asphalt are used as road materials, and by adding a coagulant such as Portland cement to these, problems in terms of strength can be solved. It is possible to construct a subgrade, especially a subbase.

Furthermore, since the road materials are made from concrete, bricks, tiles, and asphalt waste, the direct cost of materials is almost negligible, making it possible to construct the roadbed at low cost.

In addition, waste materials from concrete, bricks, tiles, and asphalt are difficult to dispose of, causing waste disposal pollution.
Since the present invention reuses these waste materials, it has the advantage of helping prevent waste material pollution.

Claims (6)

[Claims] (1) A roadbed made by coagulating a mixture of main material granules made from crushed concrete, tiles, or brick waste and granules made from crushed asphalt waste with a coagulant. (2) In the invention described in the preceding paragraph, a roadbed in which cement is used as a coagulant. (3) In the invention described in item 1, the roadbed wherein the coagulant is cement, and the amount of cement added is about 4% by weight of the mixture of crushed concrete waste and asphalt waste. (4) In the invention described in Items 1 and 3, the roadbed in which the size of each crushed granule of concrete, tile or brick waste, and asphalt waste is 10 mm or less. (5) Roadbed material made of a mixture of main material granules made from crushed concrete, tile or brick waste, and granules made from crushed asphalt waste. (6) In the invention set forth in the preceding paragraph, the roadbed material consists of the main material granules of crushed concrete, tiles, or brick waste, and the crushed granules of asphalt waste each having a particle size of 10 mm or less.