KR100591556B1 - A seepage block and method making it - Google Patents

Abstract

The present invention relates to a small high pressure pitcher block used for paving a sidewalk, a park walkway, a plaza, and the like, and a method of manufacturing the same. As a manufacturing method to compensate for the problem of strength generated as it is formed, the aggregate unit weight (kg / m) of 100% passing through 13mm sieve, 95-100% passing through 8mm sieve and 5-30% passing through 4mm sieve ³ ) cement 100-200kg / m ³ , silica sand (sand) 200-400kg / m ³ passing 90-100% in # 20 sieves and 0-20% in # 40 sieves, water-cement ratio; 20-35 weight%, water-soluble acrylic resin; 3-5 weight% of cement use, silica fume; 3-5 weight% of cement use, water reducing agent; Mixing and coating aggregate into a mixture of 2% by weight of cement used; Cement 250-350kg / m ³ with respect to the primary coating on the electrical step aggregate unit weight (kg / m ^3), a water-cement ratio; 25-40% by weight, water reducing agent: 2% by weight of cement used, inorganic pigments; A concrete mixture in which 1 to 6% by weight of cement is mixed so that the slump becomes 0 is put into a block mold and vibrated and pressurized at a pressure of 3 to 4 times greater than the pressure of frostbite. High pressure water block and a method of manufacturing the same.

Permeable Block, Aggregate Surface Area, Coating, Small High Pressure

Description

Small high pressure pitcher block and method for manufacturing same {A seepage block and method making it}

The present invention relates to a method of manufacturing a small high-pressure permeable block used for paving a sidewalk, a park walkway, a plaza, and the like, and more specifically, a 15-25% void is formed inside an existing permeable block. Various problems such as cutting, breakage and edge damage, and material separation of the surface occurred, but to compensate for this, the aggregate was coated with fine silica sand to increase the surface area of the aggregate, and at the same time, the concrete mixture put into the mold was lower than the normal block production pressure. The present invention relates to a small high pressure permeable block having a high strength and durability by maximizing adhesion between aggregates by applying -4 times higher pressure, and a method of manufacturing the same.

Conventional small high pressure blocks have good void strength and durability because they have no voids inside, so they can maintain their function as long-term package without being damaged even under light loads except heavy vehicles. Increasing the strength and durability falls, if the porosity is small to increase the strength, there was a problem that the pitcher is not good.

In order to solve this problem, a mixture of inorganic fibers such as steel fibers, glass fibers, carbon fibers, and organic fibers such as aramid fibers, polypropylene fibers, vinylon fibers, and nylon fibers was used as a reinforcing agent in moldings. Difficult to mix and expensive, and problems during the mixing process has not been practical.

Therefore, the conventional permeation block has to produce a product with low porosity and permeability in order to maintain the strength and durability properly, it is common that the pores are easily clogged by dust or earth and sand.

Thus, when a conventional high pressure block or a permeation block is used for sidewalks and driveways, the groundwater inflow is blocked because the rainwater cannot penetrate the underground, and the underground ecosystem is destroyed. Rivers may flood or cause flood damage.

The present invention has been proposed to solve these problems of the conventional permeable block, the object of the present invention is to increase the surface area of the aggregate by coating the aggregate with fine silica sand to maximize the adhesive strength between the aggregates while at the same time strengthening the strength and durability It is to provide a small high pressure water permeable block and a method of manufacturing the same that can significantly improve the porosity and permeability.

In addition, the installation of a small high-pressure pitcher block allows rainwater to easily penetrate into the basement during rainy weather to prevent absorption damage due to river flooding, to prevent depletion of groundwater, and to restore the underground ecosystem.

The present invention enhances durability while maintaining water permeability. In other words, it can be said to be a manufacturing method of a permeable block with improved durability.

In order to achieve the object of the present invention consists of three processes.

The first process is to coat sand on the aggregate to increase the surface area of the aggregate.

The larger the surface area of the aggregate, the greater the contact area with the cement paste, thereby improving its compressive strength. Thus, in order to increase the surface area of the aggregate, in the present invention, the surface of the aggregate was coated so that the sand particles were integrated.

When the sand particles are coated on the surface of the aggregate, the aggregate and the sand particles are integrated to increase the surface area of the aggregate, thereby increasing the contact area with the cement paste.

However, since cement paste fills the voids due to the aggregate particle size as a flowable material, the particle size of the aggregate was determined in consideration of the water-cement ratio of the cement paste, and the bonding force was applied to allow the sand to be integrally coated with the aggregate. Raised. It is the 1st process of this invention that considered such a point.

The second process is to form blocks by pressure while mixing sand-coated aggregates, water, and cement.

In the first process, the sand-coated aggregate, water, and cement are selected to have a mixing ratio having a predetermined permeability coefficient, and the compressive strength is improved by pressing. The compounding ratio and pressurization are mentioned later.

The third process is curing.

In this regard, three processes of the present invention will be described in detail.

1st process: Cement 100-200kg / with respect to the aggregate unit weight (kg / m ³ ) of particle size passing 100% in 13mm sieve, 95-100% in 8mm sieve and 5-30% in 4mm sieve m ^3, # 20 sieve passed 90-100% and silica (sand) passing 0-20% in the # 40 sieve 200-400kg / m ³ in the water-cement ratio; 20-35 weight%, water-soluble acrylic resin; 3-5 weight% of cement use, silica fume; 3-5 weight% of cement use, water reducing agent; Process of mixing and coating aggregate with a mixture of 2% by weight of cement

The second step: the cement 250-350kg / m ³ for a primary coating on the electrical step aggregate unit weight (kg / m ^3), a water-cement ratio; 25-40 weight%, water reducing agent; 2 weight% of cement use amount, inorganic pigment; Process of adding 1-6% by weight of cement to concrete block with a slump value of 0 and putting it into the block mold and vibrating and reinforcing it at 210kg / cm ² pressure, 3-4 times higher than normal pressure

Third step: The molding formed in the electrical process is separated from the mold and then cured according to a conventional steam curing or dry curing method.

In the present invention,

In the first step, cement 100-200kg / m ³ , 0.3-0.8mm silica sand (sand) 200-400kg / m with respect to the unit weight (kg / m ³ ) of particle size 4-8mm aggregate without mixing dust or impurities ³ , water-cement ratio; 20-35 weight%, water-soluble acrylic resin; 3-5 weight% of cement use, silica fume; 3-5 weight% of cement use, water reducing agent; The aggregate is mixed and coated with a mixture of 2% by weight of cement used. The water-cement ratio was somewhat lower than the normal permeability concrete ratio and the slump was zero to mix the aggregate well.

The water-soluble acrylic resin used in the present invention increases the adhesion, and the silica fume functions to express high strength. The aggregate coated in this way has more irregularities on the surface than the aggregate in the natural state, the surface area is increased by about 50% or more, the adhesive strength was also increased by more than 30%.

The second process is cement 250-350kg / m ³ , water-cement ratio based on the unit weight (kg / m ³ ) of the primary coated aggregate in the electrical process; 25-40% by weight, water reducing agent: 2% by weight of cement used, inorganic pigments; Concrete mixture mixed with 1-6% by weight of cement so that the slump value is 0 is introduced into the block mold, and the vibration is pressurized by the conventional method at 210kg / cm ² pressure which is 3-4 times higher than the normal pressure. If the pressure exceeds 210kg / cm ² , the aggregate may be crushed. The correlation between pressure and strength showed that the strength increased by about 20-30% as the pressure increased.

In the second process, the amount of cement input increased by about 20% compared with the mixing by the conventional permeable concrete mixing method.

In the third step, the molded product formed in the electrical process is separated from the mold, and then dried in a dry state at about 30-50 ° C. after about 10 hours of medium curing or air curing at about 50 ° C. according to a conventional curing method. Allow 12-25% to form. At this time, it is preferable that the porosity is about 15%, the permeability coefficient is 10 × 10 ⁻² cm / sec or more, and the bending strength is 50 kg / cm ² or more.

Examples and embodiments of the present invention are as follows.

EXAMPLE

A small high pressure pitcher block having a height of 6 cm and a red color was prepared, and the following processes were performed in sequence.

1) Cement 150kg / m ³ , 0.5mm silica 300kg / m ³ , water 40kg / m ³ , water-soluble acrylic resin 6kg / for aggregate unit weight (kg / m ³ ) of particle size of 4-8mm without mixing dust or impurities Mix m ³ , silica fume 6kg / m ³ , and sensitizer 3kg / m ³ so that the slump value is 0, mix the coating to adhere to the aggregate surface, and then transfer to the secondary process until the concrete hardens.

2) The unit weight (kg / m ³ ) of the first coated aggregate in the electric process, 250kg / m ^{3 of} cement, 70kg / m ^{3 of} water, 5kg / m ^{3 of} water reducing agent, 15kg / m ³ of inorganic pigment The mixture was put into the prepared block-type mold and vibrated and pressurized at 210kg / cm ² pressure, which was 3-4 times higher than 50-60kg / cm ² when manufacturing a general sidewalk block by a hydraulic device.

3) The height of the small high pressure pitcher block after pressurization became 6 cm.

4) In order to separate the molding from the mold so as not to damage the shape, the pressing plate was first lifted to the top, and then the mold frame was removed. And air curing was performed based on the normal curing method.

After the process was completed, performance test was performed on the small high pressure permeable block, and the permeability coefficient; 1.2 × 10 ⁻² cm / sec, porosity; It was excellent as 18.4% and flexural strength of 72.3kg / cm ² .

In the durability test, the temperature resistance was increased by about 20% from the initial temperature of 80 ° C, and the water resistance in the 30 ° C immersion temperature was about 4% higher than the initial temperature. Its cold resistance is about 2% lower than the initial temperature, and the humidity resistance in the temperature of 30 ℃ and 95% humidity is about 3% higher than the initial level, so the product quality is maintained and the durability is excellent even in the external environment change. Showed.

The small high pressure permeable block manufactured by the present invention can be applied to the conventional interlocking form or the manufacture of a general block in the same way, and the block of the present invention can be used not only for sidewalks but also for roadways due to its excellent bending strength and durability. will be. In addition, by maximizing the voids in the block, rainwater can be easily penetrated into the ground, and when installed in wide areas such as sidewalks, walkways, and plazas, it is possible to play a role that prevents groundwater exhaustion and disasters during flooding. .

Claims (4)

Cement 100-200kg / m ³ , # 20 sieve for aggregate unit weight (kg / m ³ ) of 100% passing through 13mm sieve, 95-100% passing through 8mm sieve and 5-30% passing through 4mm sieve 200-400kg / m ³ , water-cement ratio passing through 90-100% at 0-40% through # 40 sieve; 20-35 weight%, water-soluble acrylic resin; 3-5 weight% of cement use, silica fume; 3-5 weight% of cement use, water reducing agent; The process of mixing and coating aggregate with a mixture of 2% by weight of cement: Cement 250-350kg / m ³ with respect to the primary coating on the electrical step aggregate unit weight (kg / m ^3), a water-cement ratio; 25-40%, water reducing agent; 2 weight% of cement use amount, inorganic pigment; A concrete mixture, in which 1-6% by weight of cement is mixed so that the slump value is 0, is put into a block mold and vibrated and pressurized at 210kg / cm ² pressure, which is 3-4 times greater than the frost pressure. And curing step of curing small high pressure water permeable block comprising the step of drying A permeability coefficient according to claim 1; 1.2 × 10 ⁻² cm / sec−5.2 × 10 ⁻¹ cm / sec, porosity; 12.0-25.0%, flexural strength; Manufacturing method of small high pressure pitcher block, characterized in that 40-80kg / cm ² Cement 100-200kg / m ³ , # 20 sieve for aggregate unit weight (kg / m ³ ) of 100% passing through 13mm sieve, 95-100% passing through 8mm sieve and 5-30% passing through 4mm sieve 200-400kg / m ³ , water-cement ratio passing through 90-100% at 0-40% through # 40 sieve; 20-35 weight%, water-soluble acrylic resin; 3-5 weight% of cement use, silica fume; 3-5 weight% of cement use, water reducing agent; Aggregate is mixed and mixed with a mixture of 2% by weight of the cement usage, the cement 250-350kg / m ³ , water-cement ratio to the unit weight (kg / m ³ ) of the primary coated aggregate; 25-40 weight%, water reducing agent; 2 weight% of cement use amount, inorganic pigment; Compact high-pressure permeable block, characterized by mixing 1-6% by weight of cement to a concrete mixture with a slump value of 0 into a block mold and vibrating to 210kg / cm ² pressure, 3-4 times greater than in-phase pressure. A permeability coefficient according to claim 3; 1.2 × 10 ⁻² cm / sec−5.2 × 10 ⁻¹ cm / sec, porosity; 12.0-25.0%, flexural strength; Compact high-pressure pitcher block characterized by being 40-80kg / cm ²