KR0134990B1 - Pavement method of a road pavement supply of water concrete - Google Patents

Abstract

The present invention relates to a method of paving permeable concrete for road pavement. In particular, the permeable concrete is divided into base, middle, and surface layers, and the maximum dimension of aggregate is 40 mm and the maximum dimension of aggregate is 25 mm. For the surface layer, the maximum size of aggregate is 19mm, and the particle size is evenly distributed to compensate the surface voids to be dense permeable concrete as well as the internal voids, while mixing and spraying curing and emulsion type acrylic resins. Of pavement concrete for road pavement in which the test method for compressive strength, flexural strength, porosity, compaction rate, permeability coefficient, color, etc. is embodied to prevent the increase of strength and moisture intrusion by allowing the gas to be sucked into the concrete. .

Description

Method of paving pitched concrete for road pavement

1 is a graph of the size of the size of the conventional 13mm permeable concrete.

2 is a process diagram of the present invention.

3 is a dimensional specification graph of 40mm permeable concrete for base substrate of the present invention.

Figure 4 is a graph of the size of the size of 25mm permeable concrete for the middle and surface layers of the present invention.

5 is a graph of the size of the size of the 19mm permeable concrete for the surface layer of the present invention.

6 is a view showing a field permeability tester in the present invention.

7 is an exemplary view showing the packaging thickness calculated by the AASHTO method in the present invention.

The present invention relates to the paving method of permeable concrete for road pavement, in particular, to reduce the porosity of the surface, and to increase the maximum dimension of the aggregate while reducing the internal porosity, while increasing the maximum dimension of the aggregate, thereby reducing the amount of cement used while reducing the amount of cement used. The present invention relates to a method of paving permeable concrete for road pavement, which facilitates the purchase of materials by maintaining aggregates, maintaining a uniform particle size, and using aggregate used in general concrete.

In general, permeable pavement is classified into permeable asphalt concrete, permeable ceramic, and colored permeable concrete. Such permeable pavement is characterized by the reduction in strength and management methods due to particle size, surface softening, strength, and water bumps. Because it was not properly developed for paving, it is not used for pavement of large vehicles, but only for sidewalks, plazas, parking lots, and small road passages.

The permeable packaging material is analyzed as follows.

First, pitched asphalt concrete asphalt, aggregate, C _a CO _3, etc. are heated and mixed at 140-180 ℃, transported, laid and compacted by roller, and the paving work is completed. It is not suitable as a pavement for road use.

In addition, in summer, the packaging material is soft, so that foreign matters such as dust and dirt do not fall off, so that the permeability is easily degraded. In the case of using -S, various colors can be expressed, but there is a problem in that the cost is greatly increased and the weather resistance is poor and durability is significantly reduced.

Second, permeable ceramics are divided into products made by baking at more than 1000 ℃ using artificial aggregates and porcelains of various colors, and products made by mixing epoxy with various aggregates and porcelains of various colors. In addition, most of the aggregates in Korea depend on imports.

Third, the colored water-permeable concrete shows the size of the size standard as shown in Fig. 1. It is the size of the maximum aggregate, which is 13mm, the particle penetration rate is 100% at 13mm, 5 ~ 40% at # 4 (5.0mm), # It has a particle size of 0.27% at 8 (2.5mm), 0-14% at # 30 (0.6mm), 0-2% at # 100 (0.15mm) and 0-1% at # 200 (0.074mm). For close analysis, it is a single-particle product with particles of # 4 at 13mm.

Since the colored water-permeable concrete is excellent in strength and permeability, but is a single-grained product, when the porosity is used for paving roads, particle separation occurs due to wheels, and there is a problem in that the strength is significantly reduced when water is infiltrated.

Particularly, 13-5mm permeable concrete requires considerable caution when compacting due to the occurrence of sponge during compaction (compressing one side with the compaction roller) in case of high strength (compressive strength 250kg / cm ² or more). The construction period had to be long, and when walking while covering the hardened fabric after the compaction was completed, the footprints were left, so there was a need to pay considerable attention to the management for more than one day after curing was completed.

The present invention has been devised in view of the above, and reduces the porosity of the surface, increases and decreases the volume of the cement by reducing the volume of the cement used by reducing the volume of the unit by increasing the maximum dimension of the aggregate, while increasing the maximum size of the aggregate. The main object of the present invention is to provide a method of paving permeable concrete for road pavement, which makes it possible to maintain, to maintain an even particle size distribution, and to facilitate the purchase of materials by using aggregate used in general concrete.

Another object of the present invention is to compactly compact particles between particles to reduce surface voids, and because the particles are large, there is no fear of a sponge phenomenon even when compacting high-strength water-permeable concrete. It is designed to improve the management convenience by preventing the occurrence of light, etc. The compactness of the surface according to the even distribution of particles, the residual voids, and the high surface strength enable the pavement of areas with frequent traffic and highways.

Hereinafter, the present invention will be described in detail by process.

In the first step, the aggregate of permeable concrete for basement should be prepared with the maximum aggregate dimension of 40mm, and the aggregate with the maximum aggregate dimension of 25mm shall be prepared for the aggregate of surface and middle layer permeable concrete. to prepare aggregates of dimensions 19mm, respectively, cement 250kg / m ³ in the prepared aggregate -500kg / m ³ and the water / cement-ratio (W / C) is 25-40% and the water to the field reference laid, using cement weight And asphalt minerals of less than 20%, inorganic pigments of less than 10% of the weight of the cement, polypropylene of reinforcing fibers of less than 1.5 kg / m ³ , and cement retardants of less than 1% of the weight of cement.

In the case of the permeable concrete for the base material having a maximum aggregate dimension of 40 mm, the size of the aggregate particle size passes from 50 mm to 100% based on the percent sieve weight, as shown in FIG. 3, from 95 to 100% at 40 mm, Aggregates 75-95% pass through 25mm, 15-55% pass through 100mm, 0.-20% pass through # 4, 0-10% pass through # 10, and 0-5% pass through # 40. do.

In the case of the permeable concrete for the surface layer and the middle layer having a maximum aggregate dimension of 25 mm, the size of the aggregate particle size is 100% through 40 mm based on the sieve weight percentage as shown in FIG. 4, and 95-100% through 25 mm, Aggregates that pass 65-90% at 19mm, 40-80% at 13mm, 0-20% at # 4, 0-10% at # 10, and 0-5% at # 40. do.

In addition, in the case of permeable concrete for surface layer having a maximum aggregate dimension of 19mm, the size of aggregate granularity is 25% to 100%, 19 to 95-100% at 19mm, and 10mm at 19mm, as shown in FIG. Aggregates 20-26% pass through, 0-20% pass through # 4, 0-10% pass through # 10, and 0-5% pass through # 40.

The base, middle, and surface permeable concrete using aggregate having such a stiffness should be at least 260kg / cm ³ or more than 40kg / cm of flexural strength for road marking. For the sake of variety, the compressive strength is not less than 200kg / cm ³ and the flexural strength is not less than 30kg / cm ³ .

Cement uses 250-500kg / cm ³ flexibly according to its strength, and water cement (W / C) is based on 25-40% of the site laying criteria, which is determined by considering the quality design strength and permeability coefficient of aggregate. The porosity is 10-20%, and the coefficient of permeability is 10 × 10 ⁻² cm / sec or more.

In the pitched concrete, the aggregate is designed with an absolute volume (based on porosity of 12%) of 880 and cement is set according to strength, and according to the water / cement ratio, the aggregate is calculated by the following formula.

Aggregate amount = (880- (water weight + (use cement amount / cement specific gravity))) X aggregate specific gravity

Oil-based asphalt, such as emulsion type acrylic resin and oil-based asphalt SBR latex, is used within 20% of the weight of cement. In the case of color, inorganic pigments are used within 10% of the weight of cement depending on the degree of coloring.

The reinforcing fibers used to reinforce the flexural strength 1.5kg / m are steel fibers, carbon fibers, polyfluoropropylene fibers, and polyethylene fibers, and KSF2560 (concrete admixture) is used as the retardant. SiO, Fry A h, micro silica fume, etc. can be used.

The permeable concrete mixed in the 2nd and 1st steps is transported to the dump truck and installed in the site as a finisher for asphalt concrete, and is compacted with a tandem roller and a tire roller.

The compaction standard is 100% or more based on the strength of the concrete test specimen for the strength test of the permeable concrete. The standard setting of the compaction standard depends on the aggregate, site conditions, and weight of the equipment used. Based on the package thickness of 15cm, the tandem roller 8 tons 8-12 times and the 12 ton tire rollers 4 times.

When the third step and compaction is completed, cover the surface with a vinyl or a heat insulating cover, and cure it for at least one day, and then cure it by polymer adsorption.

Since the polymer adsorption method fills the fine pores in the concrete and passes the passage through the polymer lightly, it prevents the increase in strength, the invasion by moisture, that is, the decrease in strength by moisture, and the corrosion to acid.

Emulsion acrylic resin, epoxy, urethane, unsaturated resin, oil based asphalt, latex, etc. can be used as a material used for the polymer adsorption method. It is preferable to use an emulsion acrylic resin having the best weather resistance.

When curing sprinkling, mix the acrylic resin (50% solids) with water 1: 5-1: 10 so that the sprinkling process can be sufficiently penetrated into the permeable concrete to increase the curing sprinkling effect.

After curing sprinkling, the joints are given. The joints have expansion joints and contraction joints.

Joints can be placed together with ordinary concrete. Generally contracted joints are spaced 5-10m apart, and expansion joints are spaced 30-100m apart.

Since the pavement thickness method, base layer, and filter layer of the permeable concrete are well known, description thereof is omitted.

The permeable concrete completed through the above process is inspected, and the quality of the produced product must be controlled for compressive strength, water content, and porosity, and the density, compaction rate, permeability coefficient, and color must be managed after packing. .

Quality control standards at the production stage are divided into compressive strength, water content, and porosity. Compressive strength test is divided into 50 layers of 50mm round compaction plate, 2.5kg in weight and 300mm height of compaction, and evenly compacted 50 times. Put enough pitched concrete on the cylinder with a tripod and finish it with a tripod. At this time, insert the pitched concrete so that it cannot be pushed into the tripod, and the bottom and top are sprayed with cement powder so that no voids appear on the surface. Dissolve and mix with 50% of acrylic resin with water at a ratio of 1: 5-10 at the same conditions as the site and immerse the specimen for 30 minutes and then remove it as test specimen.

In addition, the test specimen for flexural strength is compacted into two layers with a weight of 4.5kg and a height of 450mm on a 50mm circular compaction board for compressive strength test.The compaction recovery is carried out in the same way as the specimen for compressive strength by converting the area of the bolts into compression.

The cylinder thus formed is subjected to atmospheric wet curing, and is tested after 28 days according to the compressive strength test method KSF2405 (concrete compressive strength test method) and the flexural strength test method KSF2408 (concrete compressive strength test method).

The water content is managed for the uniformity of the water cement ratio of the product. The permeable concrete is managed by the water content because the slump test is difficult.

The water content is calculated by the following formula by measuring the weight of the permeable concrete in the wet state and the dry weight.

Water content of pitched concrete = [(wet weight-dry weight) wet weight] × 100

The porosity of permeable concrete is calculated as the ratio of unit volume weight in theoretical absolute unit volume weight of solid permeable concrete to unit volume weight of measured permeable concrete, and the unit volume test is based on the unit volume according to the specimen manufacturing method for compressive strength test.

Unit volume weight in absolute unit volume weight refers to the weight per m ³ in 1 m ³ of concrete, filled without air and voids, in kg / m ³ .

Therefore, the porosity is calculated by the following equation.

Porosity = 100- (unit volume weight of permeable concrete / unit volume weight in absolute unit volume weight) × 100

Product management during construction is divided into compaction rate, permeability coefficient and color. Compaction rate is determined by density comparison, and the compaction rate is calculated by comparing the density of the test specimen for compressive strength test with the core taken in the field.

Compaction rate = (density / compressive strength and flexural strength test specimen density of field core) × 100

By comparing the cores taken from the bolts for strength testing, a more accurate compaction rate can be calculated.

The calculation of density is as follows.

Permeable concrete is a product with many voids.

Density = A / (D-E ((D-A) / F)) (A: weight of specimen in air, D: weight of coated specimen in air, E: weight of coated specimen in water, F: specific gravity of paraffin)

Permeability coefficient is based on the field permeability test method, and the field permeation test procedure and formula are as follows (refer to the field permeation tester of FIG. 6).

KP = (L × a) × lay (h ₁ / h ₂ ) / A (t ₂ -t ₁ )

(L: height of package, a: cross-sectional area of container, A: cross-sectional area of permeation, t ₂ -t ₁ : permeation time, h ₁ : level of test start, h ₂ : level of test completion) Samples are produced and compared with the product produced and the quantities are based on site loads.

Example

Width 10m, are designed based on the compressive strength 240kg / m ³ the water-permeable packing (red) as a package of the B traffic transport as road paving of the length 10km.

7 is a view showing the packaging thickness calculated according to the AASHTO method.

1. Maintain and compact the roadbed.

2. FILTER floor: Laying the 5000m ³ to 5cm using sand grader and it is a roller.

3. The base layer: keurat dajimyeo enough to use the syareon 40mm laid to 30000m ³ as graders and watering, the following general specifications as the base layer permeability coefficient is to be not less than 10 × 10 ^-2 cm / sec.

4. Permeable concrete base (40mm): 40mm permeable concrete to determine the amount of water and cement according to the strength of the mix design test The mixing result of the general portland cement, cement content is 350kg / cm ³ and the water cement ratio is water content ratio considered positive and was 122kg / m ³ the unit water hayeoteumeuro to 35%, goljaeryang was used to 1614kg / m ^3, by the above-described calculation formula goljaeryang, it retardants using 1.75kg / m ³ mix and dump in the dispatcher Plant Transported by truck, a total of 20000m ³ was laid with asphalt wheels and compacted 10 times with tandem rollers.

5. Permeable concrete base (19mm permeable concrete)

General Portland cement was used to determine the amount of water and cement according to the strength of 19mm concrete. The cement content was set to 360kg / m ³ and the water cement ratio was set to 36% in consideration of water content. Was set to 130kg / m ³ , and the aggregate amount was set to 1685kg / m ³ according to the calculation formula. Since it is a surface layer, 10kg / m ³ is used as the emulsion acrylic resin (50% of solid content) in consideration of weather resistance and impact. using the reinforcing fibers of length 12mm with reinforcement 0.9kg / m ³ and retardant uses a 1.8kg / m ^3, red inorganic pigments, and transported to a dump truck by mixing 18kg / m ³ in the dispatcher Plant, 10000m ³ They are installed as a nishisha, chopped 8 times with tandem rollers, and chopped 4 times with tire rollers to complete the surface.

When finished by compacting the surface layer, cover it with vinyl and cure for 3 days, then peel off the vinyl while spraying 300kg of emulsion-type acrylic resin (50% solids) and 2000kg of water twice, and shrinking joints at 5m intervals 1/3 of the surface layer. It was cut to the point, completely cut more than 7mm at 50m intervals, filled with back-up agent and silicone, and finished after 14 days of opening.

The quality test results of the completed permeable concrete are shown in the table below.

Claims (5)

The aggregate of basement permeable concrete should be 40mm of maximum aggregate size, and the aggregate of surface and middle layer of permeable concrete should have the maximum aggregate dimension of 25mm, and the aggregate of surface layer of permeate concrete should have maximum aggregate dimension of 19mm. Each prepared aggregate, 250kg / m ³ -500kg / m ³ cement and water / cement ratio (W / C) is 25-40% based on site, and 20% of the weight of cement and yujae asphalt within, and the inorganic pigment in less than 10% of the weight of cement used, 1.5kg / m reinforcement fibers of polypropylene of less than ³ and, mixing the cement delay of less than 1% of the weight of cement used claim, mixed pitcher After transporting concrete and laying it for asphalt concrete at the site and compacting it, the surface is covered with a cover and cured for at least 1 day, and then the cover is covered with water and 1: 5-1: 10 based on 50% of acrylic emulsion type solids. Pavement concrete for paving road pavement was made by mixing and spraying the mixed solution to the bottom of the paved concrete surface paved by mixing. According to claim 1, In the case of the base permeable concrete having a maximum aggregate dimension of 40mm, the size of the aggregate particle size passes from 50mm to 100%, from 40mm to 95-100%, at 25mm, at 25mm 75-95%, 15-55% at 10mm, 0-20% at # 4, 0-10% at # 10, and 0-5% at # 40. Method of paving pitched concrete for road spores. The method of claim 1, wherein in the case of the permeable concrete for the surface layer and the middle layer having a maximum aggregate dimension of 25mm, the size of aggregate particle size is 100% through 40mm based on the sieve weight percent, and 95-100% through 25mm, 19mm Using 65-90% of the pass, 40-80% of the pass at 13mm, 0-20% at # 4, 0-10% at # 10, and 0-5% at # 40. Of paving pitched concrete for paved roads. In the case of surface permeable concrete having a maximum aggregate dimension of 19 mm, the aggregate particle size passes through 25% to 100% based on the percentage of body weight, 95-100% through 19 mm, and 20-60% through 10 mm. Pavement concrete for road pavement using aggregate, passing through 0-20% at # 4, 0-10% at # 10, and 0-5% at # 40. The compressive strength of the finished permeable concrete pavement is more than the design reference strength, more than 10% porosity, more than 100% compaction rate, more than 10 × 10 ^-2 cm / sec permeability, color compared with the limit sample Paving method of pitched concrete for road pavement.