KR960011337B1 - Process for the preparation of concrete panel - Google Patents

Abstract

The method produces a high quality coloured and patterned porous concrete panels used for a pedestrian block, a parking block or a step. The method uses the concrete whose weight per unit cubic meter is 259-450 kg/m3, and the aggregate whose grains pass 100% through a mesh of 19 mm, 95-100% through a mesh of 13 mm, 0-30% through a mesh of 5 mm, 3% through a mesh of 0.074 mm, and void ratio is more than 12%. The method comprises steps of mixing plasticizer, acrylic resin, polypropylene, and pigment with the concrete and the aggregate; pouring the mixture in a form; finishing the back surface of the panel by vibrating and pressing the form; hardening the form under hot steam; drying the panel; spraying epoxy on the surface of the panel.

Description

Method of manufacturing patterned porous concrete panel

The present invention relates to a method for producing a patterned porous concrete panel suitable for the manufacture of sidewalk blocks, parking lots blocks, step seats because of excellent water permeability and high slip resistance.

In general, pavement used for sidewalks and parking lots is mainly composed of concrete sidewalk blocks, interlocking blocks, terrazzo tiles, specific asphalt concrete, colored pitched concrete, and granite. There are cellla pearls that use asphalt concrete, colored concrete, and epoxy mixed with color aggregates. However, the above specific products are products that are completed by the field construction method, and it is difficult to construct patterns of various colors in the field construction. Separate permeable pavement should be constructed, and it is inconvenient due to the control of the passers-by and the curing period in the construction of the city. Epoxy products are expensive in permeable pavement, and asphalt products are soft, so the pavement is elastic and durable. This is short.

Permeable packages are essential conditions in modern society for the protection of natural ecosystems, the prevention of flooding of urban rivers, and the settlement of roadbeds due to the protection of underground groundwater.

The present invention further proceeds to study the color permeable concrete patent No. 36315 obtained the invention patent by the applicant to economically produce a panel having a variety of colors in a pattern similar to granite, which is porous and high-quality material at a price equivalent to that of a concrete block. It is to provide a manufacturing method that can be. The patterned porous concrete panel manufactured by the manufacturing method of the present invention is a water permeable product having a water permeability of about 100-10-1 m / sec and increases surface hardness and strength by infiltrating the surface with epoxy or urethane resin on the surface. The surface of the porcelain is polished and the bottom surface is used as a surface. The porous product is pressed into the form bottom by pressurization and vibration of the upper part, and many voids are formed inside, but only about 50% of the internal voids are visible on the surface. Therefore, the surface shape is a product of the same effect as cutting the porous volcanic rock is a very beautiful porous product, and to provide a patterned porous concrete panel to maintain the above described the present invention in more detail by the process as follows.

First step: preparing the cement 250kg to 450kg in response to a request per 1m ³ of concrete strength change with usage, and passed 100% in 19㎜ and passed 100% at 95% at 30% 13㎜ passes from 0 to 5㎜ The amount of aggregate that passes 3% or less at 0.074mm should be prepared by the following formula so that the porous concrete pore is 12% or more.

Where G = unit aggregate (kg / ㎥), w = unit quantity (kg / ㎥), CS = cement specific gravity, GS = aggregate specific gravity, 880 = porosity excluding 120% of internal porosity in concrete absolute capacity (1000L) Practical amount per 1㎥ of concrete.

The unit quantity is set at a water / cement weight ratio of 0.25 to maintain strength and workability.

The fluidizing agent, one of the water soluble dispersants, is prepared within 2% of the cement weight. In addition, a water-soluble acrylic resin (50% solids) is prepared within 10% of the weight of the cement, and 1000g per 1m 3 of reinforcing fiber, and inorganic pigments are prepared within 8% of the weight of the cement. Two or more colors of the blended formulations are prepared.

Among the blending components, the water soluble dispersant is one of the most important admixtures in the development of cement concrete materials. In general, the classification of admixtures is divided according to the effects and uses of the admixtures, rather than being classified by the component structure.

In other words, the admixtures are distinguished according to the effects on the air content, unit quantity, condensation time, initial curing rate, etc. of concrete, and the types thereof include AE agents, water reducing agents, AE water reducing agents, high performance water reducing agents, and fluidizing agents. All are called dispersants because their performance is determined by the dispersion of cement. In addition, the admixture is also referred to as a water reducing agent due to the effect of reducing the amount of units according to the cement dispersion effect in concrete.

The water soluble dispersant is intended to disperse the pigments as well as to disperse the cement, and to obtain a reduction in the amount of pigment used in accordance with the dispersion effect of the cement and the pigment and an increase in the curing rate and the strengthening effect of the cement.

Such water-sensitive dispersants include lignin sulfonates, oxycarbonate salts, naphthalene sulfonate condensates, and the like. In addition, the water-soluble acrylic resin (50% solids) is used to suppress the whitening and increase the bending strength, epoxy, sbr retex, acrylic emulsion, etc. can be used, preferably using the acrylic emulsion can achieve the best effect have.

In addition, reinforcing fiber is used to prevent tensile cracking at the same time as forming reinforcing fiber network to reinforce the tensile strength and impact force like reinforcing bar, and can use polypropylene or polyethylene, glass fiber, steel fiber, and water and dispersion force Preference is given to using good polypropylene and polyethylene.

2nd step: Determine the order of adding the compound according to the color and pattern of the concrete panel to prepare the prepared two or more porous concrete compound, and evenly spray it on the mold coated with wax or the like using a sieve or perforated plate. Backfill with different colored porous concrete blends and finish the back with light vibration and pressure.

The pattern and color of the manufactured concrete panel vary depending on the order of adding two or more prepared compounds and the method of adding the prepared color mixture. In other words, when the compound is added, the spot pattern is formed. When the compound is added to the perforated plate, a thick pattern is formed to obtain a product having the same texture as the imported stone. The color of the pattern is selected by the color of the prepared compound. In this case, the order of feeding and the method of feeding should be carefully selected because the state of the pattern varies depending on the surface area and the degree of dispersion of the compound to be added in the mold.

3rd process: After finishing the back side, cure in steam curing tank below 65 ℃ for 10 hours By spraying the resin to absorb the surface of the porous concrete, the surface hardness and strength are strong, and more than 12% of the anthill-shaped pores are formed, and the permeability is 10 ^-1 m / sec or more, and patterns of various colors are formed. Finishing high-quality patterned porous concrete with complete surface gloss and whitening.

Epoxy or urethane adsorbed on the pattern surface of concrete increases the surface hardness and strength to increase the durability of the product, and serves to prevent surface and void wear from acidity contained in rainwater, etc. In addition, since the amount of sand used is relatively small and the unit volume is small, the use effect of cement is increased, and in particular, it is not slippery due to the porosity of the surface and shows excellent permeability.

The patterned porous concrete panel manufactured in this way is a product that can be constructed on the walls of the room because of its beautiful surface. It can be evaluated for excellence when used in sidewalks and parking lot blocks. It can play a big role in the protection of the natural ecosystem by supplying the underground.

Example

For the sidewalk block, the pattern is imperial red shape composed of red and black imported stones. The size is 300 × 300 × 60㎜. The production volume is based on 100㎡ and the color is 2.5cm only for the front filling and the back filling is cement porous concrete.

First step: 1112 molds with an inner diameter of 300 × 300 × 60 mm are prepared by spraying wax on the surface, and black and red pattern porous concrete is prepared, and backfill is prepared without porous concrete. In case of black porous concrete, 39.9kg of water, 114.8kg of cement, 684kg of aggregate, 0.57kg of fluidized fire, 2.28kg of acrylic resin (50% of solid content), 0.21kg of polypropylene, and 0.45kg of black pigment are mixed into one mixture. In the case of water, 221kg, cement 63kg, aggregate 3780kg, water-resistant dispersant 3.2kg, polypropylene 1.18kg, pigment 25.2kg mixed to make a double combination. In the case of porous concrete of cement, 368kg of water, 1057kg of cement, 6,300kg of aggregate, and 5.3kg of water-resistant dispersant are mixed and mixed.

The second process: spraying black porous concrete, which is the first compound, using a sieve and a vibrator so that the floor area is about 40% to 30%, and considering that the second porous red porous concrete is 2.5 cm thick. 2.7 cm is added, and the third compound of the remaining part on the back is added to 7 cm, and then gently vibrated and pressurized to be 6 cm.

3rd process: After finishing the backing by pressurization, after curing for 10 hours at 65 ℃ or less in the steam curing tank, remove the patterned porous concrete from the mold, remove the surface release agent with a brush, and dry the surface. The product was obtained by coating the epoxy on porous concrete to complete the patterned porous concrete of Imperial Red shape. When using this product on site, it should be used for 20 days of air curing.

Claims (2)

The amount of cement per m3 of concrete is 259 to 450 kg, and passes 100% at 19 mm, passes through 95 to 100% of sieve 13 mm, passes through 0 to 30% at sieve 5 mm, and aggregates between 0.074 mm and 3% sieve. The aggregate is used to calculate the voids to be more than 12%, the unit amount to the calculated aggregate amount so that the water / cement weight ratio is 0.25 to 0.40, the fluidizing agent is used within 2% of the cement used weight, the water-soluble acrylic resin It is used within 5% of the weight of cement based on 50% of solid content, polypropylene is used within the range of 1000g or less per 1㎥ of patterned porous concrete, and inorganic pigment is used within the range of 8% of weight of cement. After each combination, disperse them in a sieve in order according to the pattern and shape, spray them, finish the back side by vibration and pressurization, and steam cure at temperatures below 65 ℃ for 10 hours and remove them from the mold. Method for producing patterns of cellular concrete panel, comprising a step of drying the surface with epoxy adsorption dryer by spraying on the surface. The method of claim 1, wherein the urethane is adsorbed on the surface of the dried concrete product instead of epoxy.