KR100823032B1 - Composition for pavement using construction waste and soil - Google Patents

Abstract

A pavement composition using waste concrete and soil is provided to protect environment by recycling waste concrete and waste tire and to use for soil pavement or an internal wall having excellent shock absorbing capacity. A pavement composition using waste concrete and soil is composed of 8~15 weight percent portland cement, 40~45 weight percent waste concrete, 10~35 weight percent in-field soil, 5~10 weight percent waste tire chips(210) coated with cement(220), 0.02~0.03 weight percent additive per 1 weight percent cement and water at the remaining quantity, wherein the additive is composed of 30~50 weight percent calcium chloride and 50~70 weight percent magnesium oxide.

Description

Pavement Composition Using Waste Concrete and Soil {COMPOSITION FOR PAVEMENT USING CONSTRUCTION WASTE AND SOIL}

The present invention relates to a pavement composition using waste concrete and soil, and more specifically, using waste concrete and soil formed by mixing waste soil and ground tires obtained through crushing less than 10 mm and crushed waste tires and cement. It relates to a packaging composition.

As a material for paving the road, asphalt and concrete are mainly used, but ascon and cement, which are their main raw materials, are expensive for the production of asphalt and concrete, and the asphalt and concrete are simply cement or ascon for sand and aggregate. As it forms the pavement of the road by maintaining only physical coupling state, contaminants may be melted by rainwater or deteriorate the surrounding soil by chemical reactions. It has the disadvantage of falling off at high temperatures.

Therefore, in recent years, various attempts have been made to use environmentally friendly and natural landscapes, and easy to obtain and inexpensive soil as a packaging material. Soil refers to a soft surface layer in which various rocks are weathered and left in place or transported by various natural processes.The composition is composed of minerals and organic matter in which fluids of organisms are deposited. It is a very nature-friendly material that does not harm the surrounding landscape and there is no fear of contamination, so it is not comparable to the road pavement composition.

In recent years, there have been several attempts to recycle construction wastes and waste tires in terms of environmental protection. However, there have been cases where cement and construction wastes are used, but waste concrete and waste tires have been used to construct soil-based pavement. There is a need for this.

However, even in the case of using the pavement there is a problem that the lack of elasticity for use on a jogging track or road bike. In general, the pavement road with high elasticity is a method of forming a concrete pavement layer first, and then having a separate elastic layer thereon. In such a method, it takes a long time to form a pavement, and the cost increases. have.

The present invention is to solve the problems as described above, to protect the environment by recycling waste concrete and waste tires, to provide a pavement composition using waste concrete and soil that can be used on the soil pavement or inner wall with good shock absorption capacity. For the purpose of

The above object of the present invention is a pavement composition using waste concrete and soil containing waste concrete and soil, Portland cement 8 to 15% by weight, waste concrete 40 to 45% by weight, local soil 10 to 35% by weight, the outer surface 5 to 10% by weight of cement-coated waste tire chips and other additives are 0.02 to 0.03% by weight per 1 part by weight of cement and the remainder is water. Other additives are 30 to 50% by weight of calcium chloride (MgCl ₂ ) and magnesium oxide (MgO). Achievable by a pavement composition using waste concrete and soil, characterized in that it uses 50 to 70% by weight.

The soil pavement composition of the present invention is excellent in the ability to absorb shocks compared to the soil pavement roads formed using the conventional soil pavement composition, when used on the inner wall except the bearing wall of the building has the effect of blocking the noise between neighbors Able to know.

In addition, waste concrete and tires can be recycled to protect the environment.

While preferred embodiments of the present invention have been described using specific terms, such descriptions are for illustrative purposes only, and it is understood that various changes and modifications may be made without departing from the spirit and scope of the following claims. You must lose.

Features, advantages and preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The soil composition of the present invention is 8 to 15% by weight of cement cement, 40 to 45% of waste concrete, 10 to 35% by weight of local soil, 5 to 10% by weight cement-coated waste tire chips and 0.02 per 1 part by weight of other additive cement ˜0.03% by weight and the remainder are formed of water.

Cement uses common portland cement and mixes 8 to 15 percent by weight, depending on soil composition. The use of cement is intended to reinforce the problem of lowering clay forces caused by the use of soil. Cement causes hydration reactions with the mixed water to improve strength. When using less than 8% by weight of cement, there is a problem that the strength is weakened, when using more than 15% by weight is similar to the concrete pavement rather than soil pavement away from the natural color of the soil.

Waste concrete refers to concrete waste among construction wastes, and was used as the size of royal sand with a diameter of 30mm or less by crushing the waste concrete. If the waste concrete is less than 40% by weight, the purpose of recycling the waste concrete can be diluted, and if more than 45% by weight, there is a problem that the strength of the pavement is reduced.

Local soil refers to natural soil that can be collected in the field, and is classified into 18 kinds of soils such as brown soil and humus soil. Any soil can be used anyway. Used. In case of less than 10% by weight of local soil, it has characteristics close to concrete pavement rather than soil pavement, and when used more than 35% by weight, the strength is too severely degraded.

The waste tire chips are milled waste tires and processed into chips having a diameter of about 4 to 6 mm, and the G.C nonwoven yarns in the original waste tire rubbers are combined with cement. Although there are nonwoven fabrics in the waste tire chips, when the waste tire chips are mixed with the composition consisting of only cement, local soil, and other additives and water, the pavement road will show problems as shown in FIG. 1.

1 illustrates a state in which a pavement 200 is formed of a composition in which waste tire chips 210 are mixed with a composition consisting of only port cement, waste concrete, local soil, and other additives and water on the foundation road surface layer 100. It is sectional drawing to show. As shown in the cross-sectional view of FIG. 1, when the pavement road is formed of a composition in which the waste tire chip 210 and the concrete are mixed, the waste tire chip 210 tends to float on the concrete due to the difference in specific gravity. Due to this phenomenon, the waste tire chip 210 exposed to the upper part of the pavement 200 may be separated by an external impact, and thus may not be used as the pavement 200.

In order to solve this problem, in the present invention, before the waste tire chip 210 is mixed with the cement composition, an operation of coating cement on the outer surface thereof is first performed. First, 100 g of Portland cement and water were mixed at a weight ratio of 40 to 70% of cement, and then coated around the waste tire chip 210 with a coating thickness of 0.5 mm to 2 mm and cured for one day. 5 to 10% by weight of cement-coated waste tire chips 210 in the same manner as in FIG. 2, 8 to 15% by weight of cement cement, 40 to 45% by weight of waste concrete, 10 to 35% by weight of local soil, and other additives 0.02 to 0.03% by weight per 1 part by weight of cement and the rest are put in a mixture made of water and well mixed and placed on top of the foundation road surface layer 100 is constructed as shown in the cross-sectional view as shown in FIG.

As shown in FIG. 3, the waste tire chip 210 coated with the cement 220 has a specific gravity similar to that of the cement, and thus, may be uniformly mixed in the cement layer. In particular, it is possible to prevent the problem that the waste tire chip 210 is exposed on the road surface, it can be easily mixed with the mixture of portland cement and local soil by the concrete 220 exposed around the waste tire chip 210. It can be seen that. When the amount of waste tire chips is used less than 5% by weight, the noise reduction effect is reduced. When the amount of waste tire chips is more than 10% by weight, the strength is lowered, making it unsuitable for use as a bicycle road or a trail.

Other additives used 0.02 ~ 0.03% by weight per 1 part by weight of cement, specifically 30 ~ 50% by weight of calcium chloride (MgCl ₂ ) as a cryoprotectant, and magnesium oxide (MgO) to shorten the reaction time of water and cement ) 50 to 70% by weight was used. According to the prior art, it is known that an additional curing agent should be used to reinforce the strength that is degraded when mixing local soil and cement. However, when controlling the mixing amount of local soil, waste concrete, cement and water, it is necessary to secure the strength without a separate curing agent. I could see that.

Hereinafter, the properties of the soil pavement composition according to the present invention will be described through several examples.

Example Cement (wt%) Waste Concrete (wt%) Local soil (wt%) Waste Tire Chips (wt%) Calcium chloride (wt% / 1g cement) Magnesium oxide (wt% / 1g cement) One 5 50 40 2 45 55 2 8 45 35 7 45 55 3 10 40 15 7 45 55 4 10 40 15 10 45 55 5 15 40 10 10 45 55 6 20 30 0 15 45 55

The strength and the shock absorbing ability were measured according to the example of Table 1. Intensity measurement was a circular specimen, the curing conditions were subjected to curing under water at 20 ~ 23 ° C to produce D10 × H20cm, it was measured while 1cm slump. In order to test the shock absorbing capacity, the specimens were made of a wall having a length of 1 m and a length of 10 cm, and the curing conditions were carried out under water at 20-23 ° C. A weight of 1 kg was weighed on the wall at a height of 1 m and measured as a percentage with respect to the amount of impact applied to the remaining amount of impact delivered at the moment of fitting to the top of the additional specimen. For example, 100% shock absorption means that no shock absorption occurs, and 80% means that 20% of the applied shock is absorbed and the remaining 80% remains. Table 2 below shows the 7-day strength and 28-day strength and shock absorption capacity of each example according to Table 1.

Example 7 days strength (kg / cm ² ) 28 days strength (kg / cm ² ) Shock Absorption Capacity (%) One 90 110 98% 2 122 160 85% 3 147 195 85% 4 145 193 87% 5 155 210 75% 6 100 125 55%

According to the experimental results of Table 2, in the case of Example 1 has the advantage that almost close to the original appearance of the soil, but the strength is a lot of it can be seen that it is not suitable as a bicycle road or trail. In Examples 2 to 5, as the amount of cement increases, the strength increases in proportion thereto. However, in Example 6, even if the amount of cement is sufficient, when the amount of waste tire chips increases by more than a predetermined amount, the strength decreases. It can be seen that is not available as a bicycle road or trail.

1 is a cross-sectional view illustrating a state in which a pavement road is formed of a composition in which waste tire chips are mixed with a composition consisting of only port cement, waste concrete, local soil, and other additives and water on the foundation road surface layer.

2 is a cross-sectional view showing a state where a cement is coated around waste tire chips.

3 is a cross-sectional view illustrating a state in which a pavement is formed of a composition in which cement-coated waste tire chips are coated on a composition composed of only portland cement, waste concrete, local soil, other additives, and water on an upper portion of a foundation road surface layer;

Claims (4)

In the pavement composition using waste concrete and soil containing waste concrete and soil, Portland cement 8 to 15% by weight, 40 to 45% by weight of waste concrete, 10 to 35% by weight of local soil, 5 to 10% by weight of waste tire chips coated with external cement and 0.02 to 0.03 weight per 1 part by weight of cement % And the remaining components consist of water, The other additives are 30 to 50% by weight of calcium chloride (MgCl ₂ ) and 50 to 70% by weight of magnesium oxide (MgO) paving composition using waste concrete and soil. The method of claim 1, The local soil is pavement composition using waste concrete and soil, characterized in that it is obtained through the separation of diameter 10mm. The method according to claim 1 or 2, The waste tire chip is a pavement composition using waste concrete and soil, characterized in that the diameter of 4mm to 6mm. The method of claim 3, wherein The cement coated on the outer surface of the waste tire chip is a pavement composition using waste concrete and soil, characterized in that the thickness is between 0.5mm to 2mm.

Images