KR20030033636A - Paving method for cement concrete road having drainage layer - Google Patents

Abstract

PURPOSE: A drain cement concrete road pavement method is provided to prevent the frost damage of a base course, to heighten compressive strength and bending strength of a surface layer, to prevent the damage of a permeable hole caused by smoke, acid rain or calcium chloride and to heighten sound absorbing effect. CONSTITUTION: The drain cement concrete road pavement method comprises the steps of: paving an auxiliary base course, a stabilization layer and an impermeable base course in order; spraying water-soluble resins on the paved base course; paving a surface layer within 3 hours after paving the base course; spraying stiffener on the surface layer; and forming a lining in a gap of the surface layer by spraying resins within 3 hours after spraying stiffener on the surface layer.

Description

Paving method for cement concrete road having drainage layer}

The present invention relates to a method of paving a drainage road as a whole by making the base layer impermeable and the upper surface layer permeable therein. More specifically, the base layer is not damaged by the winter sea in winter compared to the conventional drainage cement concrete road. In addition, the present invention relates to a drainage cement concrete pavement paving method having high compressive strength and flexural strength of the surface layer, preventing damage to the permeable hole due to soot, acid rain, calcium chloride, and the like, and having a large sound absorption effect.

When the road is paved with permeability, the water passing through the surface layer weakens the ground of the lower layer, including the base layer, and shortens the life of the road. For this reason, most roads constructed for vehicle traffic have been paved with impermeability. However, in the case of impervious paved road, rainwater accumulates on a part of the road in rainy weather, and the accumulated water may be splashed on another vehicle or cause a water accident when passing through the vehicle, causing traffic accidents. In addition, the impervious road has no sound absorbing effect, so it is difficult to keep the car window open while driving on the road due to the noise generated by the traffic.

In order to solve this problem, the drainage paving method of the Korean Patent No. 203991 has been proposed by the present inventor, the cross section of the road by the drainage paving is as shown in FIG. The prior art method is to wrap the surface layer permeable, but the base layer beneath it is impermeable, so that the water passing through the surface layer flows from the upper surface of the lower base layer to the edge of the road, which is characterized by permeability. It is a technical configuration that firmly combines the surface layer of the castle and the impervious base layer, satisfies the requirements of compressive strength and flexural strength required as a road for vehicle traffic, and further secures and maintains permeability.

The technical structure of the previous patent, the slump value of the "aggregate + cement + water" combination is 0-4cm, the granularity of the aggregate is 5-40mm of aggregate, and 5mm or less of the remnant sand is included. Laying a compacted concrete layer for the base layer and blending it with "aggregate + cement + water" at the top, the slump value is 0-3cm, the porosity is 15-30%, and the pore size is 3% or more and 70% As above, the particle size of the aggregate is configured so that the size of the void is 10% or more, and at the same time, the aggregate size range is limited to the maximum dimension of 40 mm and the minimum dimension of 5 mm, but the residual weight percentage of 5 mm or more is 90%. It consisted of the process of installing the permeable surface layer which became above.

However, in the drainage road pavement according to the conventional patent, the surface portion of the impermeable base layer is formed with an air gap in the form of an open degree in order to secure the adhesion with the surface layer laid on the upper part, and the surface layer is formed in the pores of the base layer. As the water passed through becomes frozen, the frozen water in winter freezes and damages part of the road, resulting in reduced road life. In addition, even if the base is impermeable, since the cement itself absorbs a certain amount of water, the absorbed water is frozen in winter, resulting in a decrease in the firmness of the base.

In addition, in the drainage pavement of the prior patent, the surface layer has a pore size of 10 mm or more and 10 mm or more, and 3 mm or more by 70% or more. As the frictional force is increased, not only the phenomenon that the surface aggregate is easily released, but also the sound absorption effect is lowered due to the large diameter of the voids are formed. (In order to increase the effect of sound absorption by the voids, it is advantageous to have more small diameter pores than less large diameter pores when the ratio of all the voids is the same).

In addition, in the drainage road pavement of the prior patent, the cement-based polymer is sprayed to reinforce the strength of the surface layer. In this case, the voids of the surface layer are somewhat filled, so that the porosity is lowered, thereby resulting in poor water permeability.

The present invention was devised to solve the above problems of the prior art, and an object of the present invention is to form a surface of the base layer in a smooth shape instead of an open shape to eliminate the accumulation of water in the air gap, and also a mixture of water and resin By spraying the base layer sufficiently to coat the surface of the base layer to block the phenomenon that the base cement absorbs water, thereby preventing the base layer from being damaged by the winter sea.

Another object of the present invention is to increase the sound absorption effect of the road by reducing the size of the pores formed in the surface layer and increasing the number thereof.

Another object of the present invention is to increase the surface strength of the surface layer, and to form linings inside the pores of the surface layer to prevent corrosion of the pores by calcium chloride, soot, acid rain and the like.

1 is a cross-sectional view of the road with drainage cement concrete.

The present inventors have conducted a number of experiments to solve the above problems of the prior art and found that the desired results can be obtained if the following conditions are met.

First, as a condition for the base compacted concrete surface to have a smooth shape rather than an open shape, it must be of a particle size that does not generate a sponge even when compacted with a roller, and water can be compacted even if compacted with a heavy roller. -The condition of cement ratio should be satisfied and the right amount of cement should be used. Specifically, the water-cement ratio is lowered to 35% or less, and the amount of cement used is limited to about 400 kg / m 3, and the particle size distribution of the aggregate is 30 to 70% of # 4 (5 mm) sieve, and # 200 ( 0.074㎜) The sieve passage should be controlled to 0 ~ 10% or less.

Second, in order to coat the surface of the base so that the cement of the base does not absorb the water, it is necessary to spray mixed with water and resin (acrylic, epoxy, EVA, etc.) of the emulsion. And, by spraying the mixture of water and resin can also increase the adhesion of the base layer and the surface layer.

Third, in order to reduce the diameter of the pores and increase the number thereof, the maximum size of the coarse aggregate should be small. Specifically, the maximum size of the coarse aggregate is 8 mm, and the size of the residual particles is preferably limited to 1 mm.

Fourth, it is preferable to spray the reinforcing agent for strengthening the surface strength of the surface layer after the curing and joints are installed. If the mixture is sprayed by mixing water, cement, and resin (water-soluble acrylic, epoxy, EVA, etc.), Adhesion is also enhanced. At this time, when the pigment, silica fume, reinforcing fibers, admixtures (sensitizer, high fluidizing agent, AE agent) is mixed and sprayed, the effect can be increased.

Fifth, after spraying the surface strength enhancer to prevent water evaporation of the surface strength enhancer within 3 hours, and then sprayed by mixing water and resin, linings can be installed inside the voids, such as by installing calcium lining, soot, acid rain The corrosion of the pores can be prevented to reduce the permeability. At this time, cement, pigment, reinforcing fibers, etc. may be mixed and sprayed as needed.

The present invention is to significantly improve the problems of the conventional drainage cement concrete road by meeting the above conditions, the present invention is made of the following process specifically.

First step: impervious base laying process

An auxiliary base layer and a particle size adjusting base layer are formed, and after sufficient watering, the compacted concrete of the impermeable layer is laid for the base layer. At this time, the aggregate used as coarse aggregate is mixed with crushed stone or slag, pulverized waste concrete, sand and stone powder, so that the synthetic particle size distribution passes 100% in 40mm sieve and 80-100% in 25mm sieve. It uses 30 ~ 80% pass through # 4, 10 ~ 40% passes through # 8, and 0 ~ 10% passes through # 200, and uses 200 ~ 400 cement for 1㎥ based on the maximum compaction of these aggregates. ㎏ / ㎥, water is added in the range of 35% or less so that the sponge phenomenon does not occur when the water-cement ratio is compacted on the basis of the surface dry saturated state.

Here, the particle size range of # 200 or less in the aggregate is used to remove voids using stone powder, and 10 to 40% of voids in # 8 and 30 to 80% in # 4. In order to avoid surface voids, the maximum size of the coarse aggregate is set to 25 mm because it is easy to purchase aggregate and easy to handle.

When the amount of cement is used at 200 kg or less, the strength is lowered, which is not preferable. When the amount of cement is used at 400 kg or more, not only a sponge phenomenon occurs, but also the economical efficiency is lowered due to the unnecessary use of cement.

The ratio of water-cement ratio (W / C) to 35% or less is because when the amount of unit is increased in the formulation with a large amount of residual particles, it becomes difficult to maintain flatness during roller compaction due to the sponge phenomenon, which causes cracks. On the other hand, in order to maintain high strength, the moisture required for curing should be properly supplied, and the water depleted by lowering the water-cement ratio should be replenished by supplying sufficient amount of water during spraying after surface laying and surface layer curing.

In this step, a KSF 2560 admixture such as a water soluble dispersant and an AE agent may be used, if necessary. In addition, to reduce cracks, reinforcing fibers such as steel fibers, polypropylene fibers, carbon fibers, etc. can be used. It can have the effect of increasing tensile strength and flexural strength and using rebar. Of course, if necessary, reinforcement concrete reinforced with tensile strength and flexural strength may be provided by installing reinforcing bars or wire meshes at the bottom or the middle of the compacted concrete of the base impermeable layer.

In addition, the base can be divided into two floors, and the Dow Well Bar can be installed at the horizontal joint (shrink expansion joint) on the first floor, and the tie bar can be installed at the vertical joint or the contact area of the structure. The installation method is to install the first floor of the base layer, install the bar at the joint position, compact it with a roller, and install the second floor on the upper part.

The above materials are transported by a dump truck, laid down by manpower or whistle and compacted by rollers. Compaction is at least 95% of the maximum density of the same formulation.

2nd step: spraying process of mixed liquid of water and resin

After the base layer is installed, spray the surface by spraying 0.05 to 2 parts by weight of water-soluble resin such as water-soluble acrylic, water-soluble epoxy, and water-soluble EVA to 1 part by weight of water, and spray the spraying amount within the range of 5 kg or less per 1m2. do.

The reason for using water-soluble resin is that the substrate is still in the stage before curing. In this step, when water is mixed with the water-soluble resin, the base film (impermeable layer) is coated with a resin film, and the resin film thus formed prevents the evaporation of water from the base layer, thereby aiding in curing and adhering to the surface layer laid in the future. When this is strengthened, the penetration of moisture into the base layer is prevented, and the release of calcium hydroxide, which is the cause of whitening, is suppressed, thereby increasing the durability of the package.

Cement may be added to the sprayed mixture for strength reinforcement. The amount of cement used is preferably in the range of 2 parts by weight or less, and silica fume, reinforcing fibers, and admixtures of KSF 2560 may be added as necessary. .

3rd process: permeable surface laying process

After laying the base layer, the surface layer is laid within 3 hours. In the material used for the surface layer, the aggregate passes 70 to 100% in an 8 mm sieve, passes through 0 to 10% in a 1 mm sieve, and passes through 0 to 2% in a # 200 sieve. Cement is used in the range of 220 ~ 450㎏ / ㎥, water is used in the range of 30 ~ 45% based on the water-cement ratio, and KSF 2560 admixture or anhydrous or foaming agent such as water reducing agent, AE agent, high fluidizing agent It can be used mixed. In addition, if necessary, pulverized waste glass and waste tires of 5 mm or less may be mixed and used.

The maximum size of the coarse aggregate is 8mm for the surface layer laying. It is assumed that the aggregate of 8mm, 6mm, 3mm, etc., which is smaller size is used. Should be used in the range of. On the other hand, the number of passages through the # 200 body is set at 2% or less because the water permeability is lost when it exceeds 2%. If strength can be ensured, a part of the aggregate may be replaced with slag or ground waste concrete.

In addition, in order to increase the strength can be used by mixing a flash ash or silica fume, which is used as a substitute for cement, it is recommended to use within 20% of the amount of cement used. Since such a material is expensive, when it exceeds 20%, there is a problem in that economic efficiency is lowered compared with the strength improvement. In order to increase durability at this stage, water-soluble resins can be mixed and used. At this time, it is preferable to use acrylic, epoxy, EVA, etc. as the water-soluble resin to be used. When coloring is required for aesthetics, inorganic pigments are used, and the amount used is within 10% of the amount of cement used.

The above materials are mixed and transported to the dump truck, and compacted by rollers after installation by manpower or whistle and compacted to 95% or more of the test specimens. After compacting, it is cured by covering it with vinyl, and if necessary, it can be cured by covering the curing cloth.

4th process: surface layer strength reinforcement spraying process

In the porous package, the surface voids are about 1.5 times more than the voids in the interior, so that the surface strength is considerably lowered. Therefore, additional surface strength reinforcement is required. This process is aimed at reinforcing the surface strength, and after the laying of the surface layer and curing for at least 48 hours, the joint is installed, and on the upper part thereof, 1 part by weight of water, ordinary cement or back cement, 0.2-2 parts by weight of high strength cement, It spray-sprays the mixture which mixed 0.2-2 weight part of acrylic, epoxy, EVA, Latex, etc. of water-soluble resin uniformly in the range of 0.1-5 kg per 1m <3>.

In this case, the pigment may be mixed or sprayed by mixing reinforcing fibers and silica fume. When the pigment is mixed and sprayed in this process, the colored cement-based polymer becomes stuck in the pores, which has the advantage of long lasting color.

5th process: lining formation process of voids

In the electric process, the resin is sprayed within 3 hours after spraying the surface strength reinforcing agent to form linings in the pores of the surface layer. As the resin used in this process, water-soluble acrylic, epoxy, EVA, latex, etc. are used, and 0.05 to 1 part by weight of resin is mixed with 1 part by weight of water, and cement or reinforcing fiber can be mixed if necessary. have.

The spraying of the mixture should be carried out when the surface layer is in a dry state so that the cement of the surface layer can adsorb the resin, and it is preferable to spray the mixture sufficiently so that the mixture can reach the base layer. By spraying and adsorbing the above materials, linings are formed in the pores, thereby preventing corrosion of the pores from pollution caused by calcium chloride, acid rain or soot sprayed on the road in winter.

Hereinafter, the present invention will be described based on Examples.

(Example)

In the present embodiment, by applying the present invention, a drainage road having a width of 6m and a length of 800m is to be paved with cement concrete. The auxiliary base layer and the stabilization layer are laid in a conventional manner, and the base layer and the surface layer are laid on the top by applying the method of the present invention, but the thickness of the base layer and the surface layer is 23 cm and 7 cm, respectively, to be 30 cm in total. It was. The surface layer was colored in light red. The road pavement of this example was carried out in the following order.

1st step: Auxiliary base layer was installed by the usual method, the stabilized layer was installed, and the impermeable base layer was installed on the upper part. As a water impermeable concrete, 80 kg of water, 320 kg of cement, aggregate is a coarse aggregate. Aggregate having a particle size distribution as shown in the table below was mixed by mixing 50% aggregate with a maximum size of 25mm and 50% stone powder. Based on the surface dry saturation, 1930 kg of concrete was mixed with 1.6 kg of retardant. This carries the concrete was laid on the site in dump trucks to asphalt for hwinisya. In this embodiment, in order to reinforce the strength of the base layer, the base layer was divided into two layers, and in the first layer, the mixed impermeable concrete was laid and compacted with a roller, and a 5 mm wire mesh of 10 cm intervals was installed. In the second layer, the mixed impermeable concrete was re-installed on the top thereof, and then compacted five times with a 12 ton macadam roller. At this time, the optimum density was 2415 kg / m 3, and the compaction rate was 97.7% by 2360 kg / m 3 after compaction.

Table 1: Particle Size Distribution of Concrete Aggregate for Substrate

division 40 mm 25 mm 5 mm 2.5 mm 0.074 mm Remarks Test value 100 100 57.9 30.0 5.1 standard 100 80-100 30-70 10-40 0-10

Second step: A mixture of 10 kg of water-soluble epoxy and 10 kg of water-soluble epoxy was sprayed at 100 kg per 1a on top of the base layer installed in the above-mentioned step.

Step 3: Immediately after spraying the mixture of the electric process, aggregate 1620 which passes 100% in 112 kg of water, 350 kg of cement, 50 kg of sand, 100% in 8 mm sieves, 95% in 6 mm sieves and 0.5% in 1 mm sieves. The kg and the admixture were mixed with 1.8 kg of a retardant to mix the permeable cement concrete for the surface layer. The mixed concrete was transported to the site by a dump truck and installed in asphalt for ascon, and compacted with a roller to be 7 cm. At this time, the roller was compacted eight times with a 5ton combination roller and a 2.5ton tandem roller. The test specimen density was 2100 kg / m 3, and the compaction rate was 99.5% by 2020 kg / m 3 after compaction.

4th process: After 48 hours of curing (at an average temperature of 21 ℃), the contraction joints, which are horizontal joints, are cut to 6cm apart and 7cm deep, the expansion joints are 50m apart, and the vertical joints are cut at 3m intervals. In the state, 300 g of epoxy was injected per m 2, and a backup agent and a sealant were placed. Then, 100 kg of water, 50 kg of water-soluble epoxy, and 80 kg of white cement were mixed, and 8 kg of the red inorganic pigment was mixed and 0.5 kg per m 2 was sprayed.

5th step: The cement polymer of the 4th process was sprayed 2 kg per 1m <2> by mixing 5 kg of epoxy in 100 kg of water within 3 hours after spraying. Then, the vehicle was opened after curing for 20 days.

Samples of the base layer and the surface layer of the packaged package were collected according to the present example, and the respective compaction rate, permeability coefficient, and bending strength were measured. The results were as shown in Table 2.

Table 2: Measurement Results

division Base layer (lower floor) Surface layer (upper layer) Compaction rate (%) Permeability coefficient (cm / sec) Flexural Strength (28∂) (㎏ / ㎠) Compaction rate (%) Permeability coefficient (cm / sec) Flexural Strength (28∂) (㎏ / ㎠) color Test result 97.7 0 78 99.5 8.5 × 10 ^-1 71 Light red standard 95 or more 0 45 or more 95 or more 10 × 10-2 or more 45 or more Light red

As shown in the above measurement results, the present invention is superior in permeability coefficient and flexural strength than the standard value, even when compared to the technology of the present patent of the present invention, the permeability coefficient, flexural strength, compressive strength, etc. were much better.

As shown above, the present invention is not damaged by the winter sea in winter, compared to the conventional drainage cement concrete road, the compressive strength and flexural strength of the surface layer is high, and it is possible to prevent damage to the perforations due to soot, acid rain or calcium chloride. The present invention relates to a method for paving drainage cement concrete roads with a large sound absorption effect, and has solved all the problems that have prevented drainage paving from being applied to roads in vehicle traffic. Therefore, the present invention can be applied to drainage pavement, such as a general road or highway, it will be very advantageous to provide a breakthrough electricity to the road pavement.

Claims (7)

100% pass through 40mm sieve, 80 ~ 100% pass through 25mm sieve, 30 ~ 80% pass through # 4 sieve, 10-40% pass through # 8 sieve, Aggregate that passes 0 ~ 10% is used, and cement concrete mixed in the range of 200 ~ 400㎏ / ㎥ of cement to 1㎥ of dry compaction of such aggregate and water-cement ratio of 35% or less is used for the maximum test specimen. Compacting to 95% or more of the density to deposit an impervious base layer; In the range of 5 kg or less per 1 m 2, a mixture of 0.05 to 2 parts by weight of one or two or more resins selected from water-soluble acrylic, water-soluble epoxy, and water-soluble EVA is added to 1 part by weight of water in the upper part of the base layer installed in the electrical process. Spraying to coat the surface layer of the substrate; Within 3 hours after laying the basement, it reaches 70-100% in 8mm sieves, 0-10% in 1mm sieves, and 0-2% of # 200 sieves passes through 1m3 of aggregate maximum compaction standard. Cement to 220-450 kg / m 3, water to 30-45% of water-cement ratio based on concrete mixed to 95% or more of the maximum density of the test specimen to install a permeable surface layer; After laying the surface layer of the electric process and curing for more than 48 hours, the joints are installed, and water, acrylic, epoxy, EVA, and latex of 1 part by weight of water, 0.2 to 2 parts by weight of general cement or back cement, and high strength cement Reinforcing the strength of the surface layer by spraying a mixture of 0.2 to 2 parts by weight of one or two or more resins selected in the range of 0.1 to 5 kg per m 3; And Within 3 hours after spraying the surface strength reinforcement in the electrical process, a mixture of 0.05 to 1 part by weight of one or two or more resins selected from water-soluble acrylic, epoxy, EVA, and latex is added to the base layer in a dry state of the surface layer. Spraying to reach to form a lining in the void; drainage cement concrete road paving method comprising a. The method of claim 1, wherein one or two or more of a water soluble dispersant, an AE agent, and a KSF2560 admixture are added to the mixture of the base concrete. The method of claim 1, wherein one or more of steel fibers, polypropylene fibers, and carbon fibers are added to the water-impermeable concrete mixture. The method of claim 1, wherein one or more of the admixture of silica fume and KSF2560 is added to the coating applied to the top of the base layer. The method of claim 1, wherein one or two or more of a water reducing agent, an AE agent, a high fluidizing agent, a KSF2560 admixture, an anhydride, and a foaming agent are added to the water-permeable concrete mixture for the surface layer. The method of claim 1, wherein one or both of crushed waste glass or crushed waste tire of 5 mm or less is added to the permeable concrete mixture for the surface layer. The method of claim 1, wherein one or more of pigment, reinforcing fiber, silica fume is added to the surface layer strength modifier.