KR20010111689A - Colored fine compacted concrete pavement method - Google Patents

Abstract

The present invention solves the anxiety caused by softening and freezing of the roadbed, sliding resistance of the surface, that is, improving the safety of walking and vehicle operation by increasing friction, minimizing the visual impairment caused by diffuse reflection, and increasing the sound absorbency. Water-permeable concrete pavement to reduce the impact of oil, reduce the influence of oil, reduce the cost of using small amounts of pigment, secure high flexural strength of concrete, efficient productivity in concrete batching plant, high quality, low surface peeling and maintenance cost As a construction method, 25 mm aggregate and 13 mm aggregate are mixed at 30 to 50 weight% on the crushed substrate, and 20 to 40 weight% of ground slag is mixed therein. Fine-grained fine grain mixed with cement, polymer and water in fine-grained crushed stone that passed more than% and less than 10% in 2.25 mm sieve A concrete base layer compaction is characterized in that the curing by gearing 10~40㎜ laid in thickness on the concrete layer.

Description

Colored fine compacted concrete pavement method

The present invention relates to a colored fine-grained concrete pavement method for paving sidewalks, bicycle paths and parking lots.

In general, permeable concrete helps the growth of trees by pouring water on the surface through the air gap between aggregate and aggregate to supply to roadside trees, and during the rainy season, heavy rain or rainy season, when rain is much more than other times. As a large amount of water is permeated into this ground, it is a definite contribution to the prevention of river and river flooding as an effect of storing rainwater. As rainwater is pitched into the pavement layer as described above, since rainwater does not accumulate on the sidewalk, it is easy and safe for pedestrians to go around.

On the other hand, there are problems such as softening of the ground, deterioration of resistance to freezing and thawing, and loss of permeability due to fast pore blockage.

The permeable concrete pavement layer uses little or no fine aggregate, manages slump value close to "0", and cement paste fills a part of the void with the surface of aggregate aggregated thin enough to maintain adhesion strength. In this case, a permeation hole in which the paste is not filled is formed according to the size of the gap. In the case where the fine permeable holes are continuously made, a continuous porosity is secured and permeable.

However, such a permeable concrete pavement generally has the following problems. First, the compressive strength is less than 300㎏ / ㎠ because the mixing design with a low aggregate aggregate is made to have a continuous porosity (about 12% or more) to secure a high permeability coefficient of about 1.0 × 10 ^-2 cm / sec.

Second, when the cement is used in large amounts to increase the strength with small fine aggregate or the fluidity of the cement paste is large, the permeability of the lower layer fills the voids of the lower layer by filling the voids between the aggregate and the aggregate so that the permeability decreases and the concrete of the upper layer The strength is also lowered.

Third, there is an excessive amount of unnecessary independent voids irrelevant to the permeability, not only to lower the strength, but also to secure durability, particularly the durability against freezing and thawing, and there is a concern that the package may emerge in winter.

Fourth, because the surface is rough and the strength is low, the surface peeling phenomenon appears, and the undesired phenomenon that the water permeability is sharply lowered due to fine dust, etc. well stuck in the rough pores, the maintenance cost expenditure increases.

Fifth, in the case of fine-grain permeable concrete, the strength decreases or the durability deteriorates due to unreasonable phenomena due to the difference in the coefficient of permeability, and is dangerous because fine grained glass is used.

An object of the present invention is to solve the anxiety caused by softening and freezing of the roadbed, to reduce the sliding resistance of the surface, that is, to improve the walking and vehicle driving safety by increasing the friction force, to minimize the visual impairment due to the diffuse reflection, and to increase the sound absorbency. Reduction of operating noise, reduction of the influence of oil, supply of cheapness by using small amount of pigment, securing high flexural strength of concrete, efficient productivity in concrete batching plant, high quality, low surface peeling phenomenon and reduction of maintenance cost.

In the fine-grain compacted concrete pavement method of the present invention, 25 mm aggregate and 13 mm aggregate are mixed at 30-50 weight% on the crushed substrate, and water is evaporated after the ground compacted concrete is mixed with 20-40 weight% of the slag. Before the process, the colored fine-grained concrete mixed with cement, polymer, and water was laid on the base compacted concrete layer with a thickness of 10 to 40 mm in the fine-grained crushed stone that passed 90% or more in the 4.75 mm sieve and 10% or less in the 2.25 mm sieve. It is characterized by the compacting and curing.

1 is a cross-sectional view of a conventional pavement layer and a cross section of a permeable concrete pavement layer

2 is a cross-sectional view of the colored fine-grained compacted concrete pavement layer according to the present invention

Figure 3 is a work process of the colored fine-grained compacted concrete pavement layer according to the present invention

Recycle the resources by using the wood slag as fine aggregate. It is characterized in that the porosity is reduced to increase the strength and to produce and install the fine-grained compacted concrete to form the surface shape as permeable concrete, the detailed process of the present invention is as follows.

1st process

Build the roadbed with enough support.

2nd process

In the base layer, crushed stone is laid so that material separation does not occur with a manpower or bulldozer, etc. so as to have a predetermined shape, and crushed stone is made into a roller or compactor at an optimum water content ratio. Substrate materials are membrane crushing stones, crushed stone, and recycled concrete aggregates.

3rd process

As a process for laying and compacting the compacted concrete on the base crushed stone, 30 mm by weight of 13 mm aggregate is mixed with 25 mm aggregate, and the slag is mixed with 20 to 40% by weight and laid to vibrate.

4th process

Colored permeable fine concrete concrete mixed with hand slag, fine grain aggregate, cement, polymer (SBR latex, VAE emulsion, acrylic, etc.), pigment, retardant, water, etc. is laid within 1 hour after crushing the base compacted concrete. Lay the colored pitcher fine concrete 10-40 mm on top and cure.

This is to strengthen the adhesion between the layered laying material. For colored permeable fine concrete, it is sufficient to install 10-40 mm to maintain flatness. The compaction conditions are preferably 10% or more of porosity, 10 × 10 ⁻² cm / sec or more of permeability, and 150 to 300 kg / cm ² of compressive strength. Under these conditions, the colored permeable fine concrete is filled between the irregularities of the base compacted concrete. Substrate compacted concrete is also cement-based, absorbing polymer and water mixed in colored pitched fine-grained concrete, causing a hydration reaction and perfect adhesion between layers.

Fine aggregate aggregates are used which pass 90 to 100% by weight in the 4.75mm sieve and 10% by weight or less in the 2.25mm sieve. Fine aggregates can also be used in combination with wood slag. In the case of using the mixed slag, the slag is preferably 10 to 30% by weight.

In this process, cement retardants may be used in consideration of material transportation, laying and compaction time. The cement retardant should not exceed 2% of the cement used weight. Moreover, when adding a pigment for the purpose of coloring, it is preferable to set it within 6% of the cement use weight.

5th process

A common cutter is applied to cure horizontal joints and vertical joints.

6th process

Applying polymers such as epoxy and acryl to the surface of the colored pitched fine-grained concrete to increase the strength, and also increase the adhesive strength with the base compacted concrete to complete the paving layer.

(Example)

Hereinafter, the experimental results for the characteristics of the colored fine-grain compacted concrete pavement layer of the present invention will be mainly described.

1. Wood slag

a) generation of wood slag

In the blast furnace, iron ore, coke and limestone, which are the raw materials of molten iron, are introduced into the blast furnace, and then heated with air at around 1,200 ° C. The iron ore is dissolved by the combustion of coke and slag is produced as a by-product.

The slag discharged in the molten state around 1,500 ℃ is classified into slow cooling slag and quenching slag according to the treatment process. That is, slow cooling slag is obtained by solidifying the molten slag of high temperature molten state by air cooling in a cooling station by water cooling method by appropriate amount of water spray for 2 to 4 days, and rapidly cooling by spraying a large amount of water is quenching slag or water slag.

The handmade slag can be produced with different physical properties such as water absorption, strength and specific gravity, depending on the amount of water and the method of contacting the water and the slag. In general, slow cooling slag is bulky and has a crystalline structure, while hand slag has an amorphous or glassy structure.

b) properties of wood slag

* Physical properties

The wood slag is mostly yellowish brown and has a particle size range of 0.5 to 2.5 mm. And the shape is mostly irregular granular body, characterized by containing a large amount of pores therein. Specific gravity varies from 1.2 to 2.5, and the specific surface area is 3,500 to 4,400 cm 2 / g. Wood slag is divided into three types according to specific gravity: ultra hard, hard and soft slag. Hard wood slag has a small amount of pores inside, high compressive strength and heavy. On the other hand, soft wood slag has a large amount of pores therein and its compressive strength is low and light.

* Chemical properties

Slags in the solid state are classified into two types, crystalline and glassy. In the case of water slag, the slag in general has a glassy amorphous structure. Reclaimed slag has a considerable variation in chemical composition depending on the viscosity of iron ore and molten slag, but its main components are CaO, SiO ₂ , Al ₂ O ₃ , MgO, and so on.

CaO in slag exists in slag in the form of 2CaOFe ₂ O ₃ , 2CaOSiO ₂ , 2CaOAl ₂ O ₃ , 3CaOP ₂ O ₅ , free CaO. Among these components, about 0.1 to 2.0% of free lime is contained. In addition, the free lime on the surface of the slag reacts with water to cause microcracks in the slag particles, and water penetrates into the microcracks, thereby becoming Ca (OH) ₂ again. This process is aging.

When the slag is mixed with cement and water, the slag is known to exhibit hydraulic properties due to the stimulation of the cement. This is called the latent hydroponic characteristics of the slag. At this time, the cement induces the hydraulic expression of the wood slag is rich in stimulant salts and the thin film becomes dense, it is difficult to penetrate water to the center of the slag. Therefore, in order for the slag to hydrate, it is necessary to add alkali or sulfate to loosen the silicate on the surface of the slag. Cement may be used as a stimulant for this purpose. Therefore, when the slag and cement are mixed, the hydraulic properties of the cement slag as well as the hydraulic properties of the slag can be expected.

2. Stratified concrete

Substrate compaction concrete is 81 kg / ㎥, cement 270 ㎏ / ㎥, aggregate 1650 ㎏ / ㎥, retardant 0.6 kg / ㎥ mixed with a vibration roller so that the porosity of 5% or less, compressive strength of 180㎏ / ㎠ or more It was.

3. Colored pitcher fine grain concrete

Within 1 hour after the compaction of the ground compacted concrete, colored permeable fine concrete was laid. Colored pitched fine-grained concrete uses 80% by weight of fine-grained crushed stone that has passed 90% or more in water 73.5㎏ / ㎥, cement 300㎏ / ㎥, 4.75mm sieve and 10% or less in 2.25mm sieve, and 20kg of wood slag % Used.

The polymer used as the mixed material was an acrylic polymer having a solid content of 57%, and 20 weight% of the water used was substituted. The retardant used 0.3% of the amount of cement used, the pigment was used 12kg / ㎥, 4% by weight of the cement. The color-permeable fine-grained concrete was mixed and chopped and covered with vinyl to prevent over-evaporation and rapid evaporation of water, and the surface was sprayed with polymer.

The test results for the colored fine-grained concrete pavement layer thus completed are shown in the table below.

division Item Compressive strength (㎏ / ㎠) Flexural strength (㎏ / ㎠) Permeability coefficient (cm / sec) Porosity (%) Stratified Concrete Test 238 44 - 4 standard More than 180 More than 30 - 5% less than Colored Pitcher Fine Grain Concrete Test 204 41 39.2 × 10 ^-2 13 standard More than 180 More than 30 10 × 10 ^-2 cm / sec over 10

(Test result)

The packaging layer according to the present invention exhibited high strength, and the permeability coefficient also satisfied the prescribed value. This is of great value compared to conventional permeable concrete pavement in terms of recycling resources.

As described above, the colored fine-grained concrete pavement layer of the present invention is a method of improving the low water permeability and high compressive strength by replacing fine aggregate with water slag and vibrating compaction, and has the following improvement effect.

First, because water does not flow on the road, the sidewalks in Pedestrians and on the roads are convenient for vehicle traffic and high sliding resistance, which greatly reduces the risk of vehicle driving accidents and greatly reduces the visual impairment caused by diffuse reflections. The noise caused by traffic can be reduced.

Second, because of the characteristics of the concrete is less affected by the oil and the original color of the concrete is off-white, even if only a small amount of pigments to express a beautiful color can be obtained the color of the desired bar at a low cost.

Third, since the bending strength of the concrete is sufficiently secured, even if the auxiliary base is broken, it can be maintained without problems, and during production, it can be easily produced even with a concrete batching plant.

Fourth, as the required aggregate aggregate rate is secured, the surface is not rough and surface peeling occurs less, and less dust is required, thereby reducing maintenance costs and improving durability against freeze-thawing.

Fifth, the continuous porosity is maximized by reducing unnecessary independent voids, thereby extending the mechanical life.

Claims (4)

25 mm aggregate and 13 mm aggregate are mixed with 30-50 weight% on the base of crushed stone, and the base compacted concrete with 20-40 weight% of hand slag mixed therein is chopped and passed more than 90% in 4.75 mm sieve before water evaporates. In the 2.25mm sieve, 10% or 40mm thick fine-grained fine-grained concrete mixed with cement, polymer and water is added to the fine-grained crushed stone, which is 10% to 40mm thick, and compacted and cured. Concrete paving method. According to claim 1, wherein the colored permeable fine concrete layer is 300 to 380 kg / ㎥ of cement, water-cement ratio of 28 to 35%, the fine slag and fine granules of fine granules having a total use of 1616 ~ 2015 kg / ㎥ Concrete paving method. The base compaction concrete is water 76-123kg / ㎥, cement 270-350kg / ㎥, wood slag 312 ~ 686kg / ㎥, 25mm aggregate 70-50 weight%, 13mm aggregate 30-50 aggregates by mixing the weight% 1560~1716㎏ / ㎥, by mixing the admixture 0.2~0.5㎏ / ㎥ construction such that the void ratio of 7% or less, permeability coefficient 10 × 10 ^-3 ㎝ / sec, compression strength 180~300㎏ / ㎥ Colored fine granular concrete pavement method characterized in that. The colored fine-grain compacted concrete according to claim 1, wherein the polymer is at least one of epoxy, modified acrylic, and the like.