KR100272798B1 - Water permeable concrete with high degree fluidity - Google Patents

Abstract

PURPOSE: A water permeable concrete with a high degree of fluidity is provided to smoothen a fluidity of a concrete and raise a slump. CONSTITUTION: With respect to an aggregate compaction reference 1 m¬3 (a passing rate of 80 to 100% through a 13 mm meshes, a passing rate of 0 to 50% through 5 mm meshes and a passing rate of 0 to 10% through 1 mm meshes), cement of 250 to 500kg/m¬3, water of 110 to 180kg/m¬3 and an agent of a high degree of fluidity of 0.2 to 50% of the amount of the cement used are mixed, so that a slump reaches 10 to 25cm. By conventional paving and curing methods, the mixture has a void volume of 10% or more, a coefficient of water permeability of 10x10-2 cm/sec or more and a pressure strength reference of 150 to 300 kg/cm¬2.

Description

High fluidity permeable concrete

The present invention relates to a high flow permeable concrete having a slump of 10 cm or more, and more specifically, to aggregate water having a maximum aggregate size of less than 13 mm, aggregate, water, cement, and a high fluidizing agent. It is about concrete with a lump of 10-25 cm.

Since the permeable concrete of the present invention is very excellent in fluidity, the concrete flows to every corner during construction and is automatically leveled so that there is no need to separately process the upper surface or compact the compactor or vibratory compactor. In addition, the permeable concrete of the present invention is easy to construct, the construction speed is fast, and can maintain high permeability without dropping in strength, in particular, a small amount can be easily applied to road repair work, press, It can be applied to the pavement of bicycle roads, parking lots, plazas and driveways.

Conventionally widely used water-permeable concrete includes the "colored water-permeable concrete" (Korean Patent No. 36315), which was invented and patented by the inventor of the present application, and the color-permeable concrete has a maximum dimension of aggregate less than 13 mm. The slump is blended to 0 cm, transported by a damp truck, and installed in the field by asnish whiskers and manpower, and compacted by a 1ton or more roller equipped with an engine to enhance strength and maintain surface flatness and level. The compaction load is compacted with a compactor of more than 1 ton to complete the package.

The colored water-permeable concrete (Patent No. 36315) has been widely used for its advantages such as ease of construction, reduction of construction cost by shortening the air, and excellent permeability, but on the other hand, it has the following problems.

First, since Patent No. 36315 has a slump of 0 cm and porosity, evaporation of water during summer packaging is fast, and it is difficult to install at 25 ℃ or higher. Therefore, it is produced by increasing the unit quantity of permeable concrete. Defect rate is high due to uneven surface such as rice cake.

Second, because it is necessary to prepare Laura for the compaction, the preparation and construction of the construction is cumbersome, and the small amount of construction is not easy to apply to the repair work for the small part due to the high construction cost.

Third, due to the large number of air gaps in the winter season, rapid cooling is performed by cold air, which is weaker in the East Sea in construction than general concrete with a large amount of units.

Fourth, since it is compacted by Laura, there is a high possibility that the shape of the surface will vary depending on the unit quantity difference.

In addition, as a conventional technique, there is a "method of manufacturing a high permeability cement concrete construction" (Korean Patent No. 4690), which is patented under the name of Sato Oro Kabuki Kaisha, Japan. 100-50% pass through 5mm sieve, 8-25% when water / cement ratio is 0.35-0.43 in water, 2.5mm and 0-18% when water / cement ratio is greater than 0.43 and less than 0.45, 1.2mm sieve Aggregate having a particle size distribution of 0-6% by weight of is mixed with water, cement and binder, ie, latex, acrylic, epoxy resin of emulsion, and then poured into a mold to harden.

This "method of manufacturing high-permeability cement concrete construction" has a problem that it is difficult to purchase aggregates because it is difficult to purchase the aggregates because the range of aggregate particle size is tightly defined, and the slump is about 5 cm and is not a fluid product. It is not a product that can be pledged and must be completed with the installation of Huniisha, which is cumbersome in construction and difficult in small quantities.

The present invention has been made to solve the problems of the prior art of the above example, the object of the present invention is to disperse the water contained in the cement by the high fluidizing agent to increase the slump, and smooth the flow of concrete by the electrostatic reaction force Therefore, by increasing the slump, it is to provide a permeable concrete without problems such as material separation.

Another object of the present invention is to provide a water-permeable concrete that is not cumbersome in construction, easy to produce in a general ready-mixed concrete production plant and simple packaging equipment does not require skilled technology.

It is still another object of the present invention to provide a water-permeable concrete that can withstand the East Sea in winter by increasing the amount of unit.

Too much unit yield when mixing water and cement results in separation of aggregate and cement and a decrease in strength, rather than increase in fluidity. Another object of the present invention is to prevent such separation by using a high fluidizing agent. An object of the present invention is to provide a water-permeable concrete.

The water-permeable concrete of this invention passes 80-100% in 13 mm sieves (even if it passes 80-100% in 10 mm sieves), and 0-50 in 5 mm sieves based on the sieve weight percentage. %: Cement: 250-500㎏ / ㎥, water: 110-180㎏ / ㎥, high fluidizing agent: 0.2 of cement weight Mix -5% so that the slump is 10-25 cm.

However, in order to provide a thin permeable concrete pavement, as the aggregate of the present invention, the particle size distribution can be used to pass 50-100% in a 2.5 mm body and pass within 0-10% in a 1 mm body. That is, cement: 250-500㎏ / ㎥, water: with respect to the aggregate maximum compaction standard 1㎥ passing 50-100% in the 2.5mm sieve, and within 0-10% in the 1mm sieve, 110-180㎏ / ㎥, High fluidizing agent: Mix 0.2-5% of the weight of cement so that the slump is 10-25cm.

Examples of the high fluidizing agent include naphtharin, melamine, carboxylic acid, and aminosulfonic acid. A high fluidity can be obtained by increasing the dispersibility of the particles of the binder (cement, blast furnace slag fine powder, fly ash, silica fume, etc.). It is to be. In other words, the dispersion of the binder particles causes the molecules of the sensitizer to bind to the binder particles to exert fluidity mainly by the electrostatic reaction force (zeta potential) caused by the interfacial layer of colloidal particles.

Since the high lubrication permeable concrete of the present invention is high slump and permeable, the cement paste can flow into the voids, and as the permeable concrete without compaction, there is a possibility that the strength may be affected. Therefore, in order to increase the adhesion area with the aggregate, It is preferable to use silica sand, stone powder, fry ash, silica fume or the like of 100 mesh or less within 50% of the amount of cement used to prevent this. On the other hand, in order to accurately calculate the slump value, it is preferable to add these stone powder, fry ash, silica fume and the like before use of the high fluidizing agent.

In pitched concrete, the amount of units contained is more than 20% higher than that of ordinary concrete. That is, since water molecules contained in cement are 25 to 40% in water-permeable concrete in general concrete, while water molecules in cement are 20-30%, water-molecules and cement In addition, there is an effect of completely dispersing, and when the pigment is added together with the high fluidizing agent, since the pigment is completely dispersed, the occurrence of whitening due to the use of the pigment is reduced, thereby increasing the effect of coloring.

In addition, in the high fluidity permeable concrete of the present invention, when light reflection is required, 5 mm or less of crushed waste glass can be used within 20% of the aggregate usage, and in order to have elasticity, 5 mm or less Grinded waste pieces can be used within 10% of aggregate usage. The use of the crushed waste tire pieces at this time is not to make the product itself an elastic body, but to improve the resistance force due to the resilience elasticity against load.

The construction of the high flow permeable concrete of the present invention mixed in this way is very simple. High-permeability water-permeable concrete of the present invention is a high slump-permeable concrete, so it must be transported with a mixer truck, and when poured into a paving section where a boundary stone is pre-installed, it spreads itself to form a horizontal bar, a wooden rod, a chain rod, a plastic rod, etc. Clean the surface and set up the raised aggregates by tapping and lying down.

After finishing the construction, cover with vinyl as usual and cure for at least one day, install the joint with a cutter, and add the backing agent and sealing agent. After checking the dry condition of the surface, it is possible to spray the polymer when it is in the dry state. The polymer to be sprayed is epoxy, urethane, unsaturated resin, acrylic resin, and the spreading amount is within the range of 10 to 50㎏ based on 50% of solid content. Spraying at is preferred.

Spraying the polymer suppresses the whitening that occurs in cement, has the effect of improving the surface strength, and the effect of the color becomes apparent. If coloring is required, the pigment can be mixed and sprayed, and the amount of pigment used is preferably mixed within 20% of the amount of resin used. After curing by spraying polymer and opening, it is permeable concrete package with more than 10% of porosity, more than 10x10 ^-2 ㎝ / sec of permeability, 150-300㎏ / ㎠ compressive strength and 25-50㎏ / ㎠ flexural strength. Will complete.

In the case of drainage packaging, the base layer is packed with porous compacted concrete and sprayed on the porous compacted concrete for the base within 3 hours, and then the high flow permeable concrete of the present invention can be completed to complete the drainable concrete. In the case of thin layer packaging, the high-permeability water-permeable concrete of the present invention having a maximum aggregate size of 2.5 mm after spraying the compaction-permeable concrete for basement and spraying within 3 hours after compaction is sufficient.

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

(Example)

The color shall be reddish brown, and the road width of 2m, length 100m, and paving thickness of 7cm shall be paved, but the maximum size of the coarse aggregate is 13m (A) and 2.5mm (B), each 50m packed It was set as.

1) Particle size range of aggregate used

Aggregate size (mm) 13 5 2.5 One % Pass weight (A) 100 40.5 - 2.5 % Of weight passed (B) 100 65.4 5.4

2) material used (㎏ / ㎥)

(A formulation) (B formulation)

Aggregate: 1,550 Silica Sand: 1570

Cement: 350 Cement: 360

Water: 122 Water: 145

Pigment: 14 Pigment: 14.4

Silica fraction: 50 Fryash: 36

High fluidizing agent: 7.6 High plasticizing agent: 8.4

3) Mixing method

All the ingredients except for the high fluidizing agent were added and mixed in a mixer for 1 minute, and then the high fluidizing agent was added and mixed for 20 seconds.

4) laying process

The mixed high-permeability water-permeable concrete mixture was transported to the site by a mixer truck, and 50 m in A mixture and 50 m in B mixture were installed in the boundary stone pre-installed, and the surface was cleaned using a chain rod. When the surface became coagulated, it was covered with vinyl and cured for 2 days. After curing, water was cut with a cutter, sludge generated during cutting was removed with water, and whitefish was added, and urethane was added as a sealing agent in a dry state.

5) Test result

The porosity, permeability coefficient, and compressive strength of the package completed by the above process were measured. The results are as follows.

division Porosity (%) Permeability coefficient (cm / sec) Compressive strength (㎏ / ㎝ ² ) A combination 17.5 4.2 x 10 ^-1 218 B combination 16.1 2.9 x 10 ^-1 235

High-permeability water-permeable concrete of the present invention is easy to be installed even by skilled workers, construction speed is fast, construction is possible at any time, regardless of the summer or winter, as well as a small amount of production is easy to be applied to repair work As a result, porosity, permeability coefficient and compressive strength are also excellent.

In addition, the present invention can be applied to water-permeable concrete pavement and thin-permeable pavement, the use is very useful that can be widely applied to sidewalks, bicycle roads, parking lots, factories, driveways.

Claims (8)

Cement: 250-500kg / for the maximum compaction standard for aggregates passing 80-100% in 13mm sieves, 0-50% in 5mm sieves and 0-10% in 1mm sieves. M3, water: 110-180kg / m3 after mixing, high fluidizing agent: high fluidity permeable concrete so that the slump is 10-25cm by mixing 0.2-50% of the amount of cement used. Cement: 250-500kg / for the maximum compaction standard for aggregates passing 80-100% in 10mm sieves, 0-50% in 5mm sieves and 0-10% in 1mm sieves. M3, water: 110-180kg / m3 after mixing, high fluidizing agent: high fluidity permeable concrete so that the slump is 10-25cm by mixing 0.2-50% of the amount of cement used. Cement: 250-500㎏ / ㎥, water: 100-180㎏ / ㎥ for 1㎥ of aggregate maximum compaction standard that passes 50-100% at 2.5mm and 0-10% at 1mm sieve. After mixing, high fluidizing agent: A high-permeability water-permeable concrete mixed with 0.2-5% of the amount of cement used to have a slump of 10-25 cm. Cement: 250-500kg / for the maximum compaction standard for aggregates passing 80-100% in 13mm sieves, 0-50% in 5mm sieves and 0-10% in 1mm sieves. M3, water: 110-180kg / m3, and then, high fluidizing agent: 0.2-50% of the amount of cement used, so that the slump is 10-25cm, and the mixture is laid and cured by a conventional method. A method of constructing high-permeability water-permeable concrete such that the package has a porosity of 10% or more, a permeability coefficient of 10x10 ^-2 cm / sec or more, and a compressive strength of 150-300㎏ / ㎠. Cement: 250-500㎏ / ㎥, water: 100-180㎏ / ㎥ for 1㎥ of aggregate maximum compaction standard that passes 50-100% at 2.5mm and 0-10% at 1mm sieve. After mixing, high fluidizing agent: 0.2-5% of the amount of cement used is mixed so that the slump is 10-25 cm. The high fluid permeable concrete construction method is 10x10 ^-2 cm / sec or more, the compressive strength is 150-300㎏ / ㎠. The method according to claim 4 or 5, wherein after curing, at least one or more of epoxy, urethane, acrylic, and unsaturated resins are selected and sprayed at 10-50 kg / m 2 based on 50% solids. Dongsung pitching concrete construction method. The method according to claim 4 or 5, wherein at least one or more of fine powder of 100 mesh or less, frying ash, silica fume, or high-loss lag powder is selected and used within 50% of the amount of cement used before mixing the high fluidizing agent. High fluidity concrete construction method characterized in that. The method of claim 4 or 5, wherein the inorganic pigment is used within 10% of the amount of cement used.