KR20030093056A - Paving technology and manufacturing method of porus concreate using recycled aggregate - Google Patents

Abstract

PURPOSE: Provided is a method for producing and paving a porous concrete by using one component reclaimed aggregate, which secures the stability of aggregate, improves the concrete quality, simplifies the processing steps and increases the surface strength. CONSTITUTION: The method for producing and paving a porous concrete comprises the steps of: grinding waste concrete to discriminate the particles in which 90-100% of particles pass the sieve size of 20 mm, 20-55% of particles pass the sieve size of 10 mm, 0-10% of particles pass the sieve size of 5 mm and 0-5% of particles pass the sieve size of 2.5 mm, according to KSF 2573 defining the quality of a reclaimed aggregate by the ratio of particles passing the sieve size of 25 mm, 20 mm, 10 mm, 5 mm and 2.5 mm; selecting the aggregates having the absorption of less than 2%, the specific gravity of greater than 2.6, the wear rate of less than 25% and the particle shape judging the volume ratio of greater than 55%; and pre-wetting the selected aggregates to correct the absorption.

Description

Paving technology and manufacturing method of porus concreate using recycled aggregate}

The present invention relates to the production method and repair reinforcement of porous concrete using recycled aggregates, and overcomes the problems of the quality standards of comprehensive products recycled using 25mm and 8mm recycled aggregates using two types of recycled aggregates for concrete. The method of manufacturing the recycled aggregates, adjusting the surface yield and mixing epoxy, and coating the process of correcting the absorption rate of two kinds of recycled aggregates by reinforcing strength, increasing permeability coefficient, and coating of epoxy resin, which are problems of existing concrete concrete It is about.

In general, the porous concrete using recycled aggregates currently in use uses 8mm aggregates which are extremely small in the nation, and 10mm single-grained porous concrete is a complicated process of aggregate production, and porous concrete with l3mm aggregate particle size ranges and products. The problem of strength is one of the most vulnerable problems.

In addition, there is no clear section on the epoxy defense to secure the physical properties and weather resistance of the surface.

Therefore, in order to solve the above problems, an object of the present invention is to secure the stability of the aggregate using the first recycled aggregate prescribed in the Korea Industrial Standard for aggregate aggregates of porous concrete, the actual production of the particle size range 20mm and less than 10mm Improved quality by applying the aggregate activity of the aggregate supply and the adjustment of the recently changed aggregate dimensions and improving the recycled aggregate into one type. In order to simplify and to effectively increase the surface strength of the porous concrete with epoxy components and formulations, it is to provide the production and packaging technology of the porous concrete using one recycled aggregate.

In order to achieve the above object, the present invention uses the general particle size distribution of the recycled aggregate currently produced to facilitate the supply and demand of the technology and in recent years to improve the workability and strength in various concrete structures It is to manufacture porous concrete that secures the durability and quality homogeneity of products by accepting the technology of adjusting the maximum dimension of aggregate to 20mm for the sake of performance. In addition, in order to secure the stability of aggregate, which is the most problematic in porous concrete, the surface of the aggregate using the aeration tank applied for the removal of fine powder adhered to the aggregate surface and cracks due to the absorption rate through prewetting during mixing of the aggregate and To improve the quality stability of porous concrete.

The present invention is to crush it from the concrete ingots selected from the concrete structure and to remove the surface pulverized fine powder from the aeration tank, using a high-quality recycled one aggregate with less than 2% absorption rate, specific gravity more than 2.6, wear rate less than 25% Water, cement, pigments and admixtures are mixed to produce cement concrete for paving.

Hereinafter, the present invention will be described in detail.

The present invention is to recycle from the concrete ingot generated from the dismantled concrete structure to aggregate of the road concrete for paving concrete, and the recycled one aggregate which stabilizes the absorption rate by removing the fine powder of the surface as the basic aggregate, cement In order to improve the quality of the production of the porous concrete produced by adding water or pigments and mixed materials, it consists of the following four processes.

Step 1: Production and pre-wetting process of 1 type recycled aggregate

The waste concrete is pulverized to one type of particle size standard of KS F 2573 (recycled aggregate for concrete), and it is a process of removing fine powder attached to aggregate surface through aeration tank. In addition, in order to adjust the high absorption rate of the degraded aggregate prior to blending, it is a process of spraying water on the surface of the aggregate to ensure workability. At this time, among the aggregates satisfying the quality standards of KS F 2573 (concrete recycled aggregates), the quality of the aggregates used in the present invention is shown in Table 1, and the particle size distribution for each use is shown in Table 2.

Table 1. Quality of Type 1 Recycled Aggregate

Table 2. Particle Size Distribution by Type of Porous Concrete Using 1 Type of Recycled Aggregate

Second Process: Cement Input Process

In the electric process, cement is mixed with 280 ~ 350kg / m² of prewet recycled aggregate in order to effectively remove fine powder from the surface of recycled aggregate, which is a crucial adjustment factor for the quality, and to manage the absorption rate. The cement is first injected because the strength is determined by the level of adhesion between the aggregate and the aggregate through the dry beam and the porosity is easily secured.

3rd process: process to input fine aggregate, water, mixed materials

It is a process to finish the porous concrete for sidewalks by incorporating fine aggregate, pigment, water, and miscible materials into a mixer mixed with 1 type recycled aggregate and cement. In general, the Korean Industrial Standard stipulates the quality standards for packaging aggregates with a wear rate of 40% or less. However, this is the lowest level, and aggregates with a wear rate of 40% or more are lost as aggregates. Therefore, in the present invention, the wear rate is defined as 25% or less.

The number of water used is preferably inducement of strength by setting the water-cement ratio in the range of 25 to 40% so that the slump of the finished porous concrete is 0 to 5 cm or less.

Especially for the proposed slump, the workability problem is corrected by using high performance fluidization sensitizer.

4th process: water soluble epoxy resin application process

After laying the finished concrete after the above process, it is a process of spraying a two-component water-soluble epoxy resin in order to secure the bonding strength and color expression of the upper surface in order to completely dry and ensure the durability of the product.

The water-soluble epoxy resin used in the present invention is a product obtained by polymerizing new special epoxy compounds and modifiers condensed in epichlorohydrin and bisfenol A, unlike conventional epoxy resins, and polymerizing them. Adhesive waterproof crack repair of concrete structures of civil construction It is not only used for molds and impregnations in electrical and electronic industries, but also for rustproof linings, and has a wide range of properties such as strong adhesion to metals, wood, glass, ceramics, etc. and high wear resistance, impact resistance, weather resistance, and chemical resistance.

The porous concrete produced and constructed by the electrical processes meets the strength values specified in the Korean Industrial Standard. In addition, unlike conventional products, the slump is adjusted to 5 cm or less, so that stable product management is easy, and it can be transported using a dump truck.

The transported porous concrete is sprayed with water enough to be wetted with the surface contacting materials such as base and boundary stones before laying, and prevents water loss of the permeable concrete and installs it by manpower or equipment with care not to cause material separation.

Surface pavement must be homogeneous and compact during construction because it can be directly affected by traffic loads and the environment, and must have sufficient flatness to drive traffic vehicles directly.

In addition, the level should be maintained at the time of laying. The compaction is vibration-free to maintain the permeability gap, and the left and right outer parts are wedge-shaped, and the voltage is 2 to 8 times by the use of hand rollers and compactors for flatness and compactness of the surface layer. (Be careful not to open the gap between laying tank and finishing tank during work)

EXAMPLE

1 type recycled aggregate is adjusted to the particle size range of KS F 2573 (concrete recycled aggregate) and recycled aggregate (10mm) porous concrete is made of low slump porous concrete with slump of 2cm or less ) Using 1 type recycled aggregate (10mm), pack it with strength standard of l80kg / cm² and surface layer as 7cm.

The equipment used for this embodiment includes: 1) grinder: consignment grinding in a grinder including an aeration tank; 2) mobile production equipment 50 m³ / hr; 3) Construction equipment: 1 turndem roller, 1 ascon finisher, 1 coating sprayer.

The materials prepared for this example are one type of recycled aggregate, pigment, cement, water used, high flow sensitizer, and epoxy resin. In the case of aggregate, all kinds of recycled aggregate was used. The calculated amount was prepared using the design.

The compounding ratio of the materials used in the present embodiment is shown in Table 3.

Table 3.

The process carried out in this embodiment is as follows.

1st process: After the waste concrete ingot is charged to the crushing plant with the aeration tank, the suitable green and primary processing of Table 1 is processed, and then the secondary processing is made to meet the particle size of RPC10 in Table 2 and free to correct the absorption rate. Wetting was put into a mobile production facility.

Second process: 1,640 kg of recycled aggregate of 1 type and 280 kg of cement were added to dry beam.

Third step: 10 kg of pigment, 110 kg of water and 1.51 kg of mixed material were added to the electric process and mixed.

4th step: Since the slump of the porous concrete produced in the electric process is 5cm or less, it was transported using a dump truck and laid in the field. In laying on the site, concrete was installed with a finisher, compacted with a roller, paved with 7 cm for the base layer, and 7 cm of surface concrete was laid thereon.

5th step: After curing of surface concrete, the two-part water-soluble epoxy resin was sprayed on the surface to complete the pavement.

Inspecting the quality of the porous concrete completed by the present embodiment and the results are shown in Table 4.

Table 4

As shown in Table 4, it can be seen that the quality of the road paved with porous concrete using the first recycled aggregate according to the present embodiment exceeds the standard specification.

The present invention can be used as a raw material for packaging materials by pre-treating some recycled aggregates to build a smooth distribution network of the produced recycled aggregates to maximize the efficient resource management and recycling effect, and to expect more effective technology ripple effect Can be.

Claims (5)

Pulverized concrete is passed through 25mm, 20mm, 10mm, 5mm, 2.5mm particles, 90 ~ 100% at 20mm, 20 ~ 55% at 10mm, 0 ~ 10 at 5mm of KSF 2573 (recycled aggregate for concrete) Sorting into particles passing 0 to 5% at% and 2.5 mm; One type of recycled aggregate is characterized by the process of screening aggregates with an absorption rate of 2% or less, a specific gravity of 2.6 or more, a wear rate of 25% or less, and a particle shape determination performance rate of 55% or more, and a process of prewetting to correct the absorption rate. Manufacturing and paving technology of porous concrete. According to claim 1, the recycled aggregates are sorted and selected by using water, cement, high-performance fluidizing agent and pigments to produce a porous concrete, which is conventionally laid and cured according to the method, two-component water-soluble epoxy resin Spraying 3.3 kg per 1 a thickness of 0.5 mm in thickness to dry; In the two-component water-soluble epoxy resin of the electric process, the main ingredient is a hardener mainly composed of aromatic hydrocarbons, ketones, reactive diluents, and polyamide resins, aliphatic polyamines, and aromatic hydrocarbons. Production and packaging technology of porous concrete using 1 type recycled aggregate characterized by 1 (wt%) resin. The particle size distribution of porous concrete using one recycled aggregate is 100% at 13 mm, 90 to 100% at 10 mm, 40 to 80% at # 4, and 0 to 10 at # 10. Production and packaging technology of porous concrete using one type of recycled aggregate characterized by the concrete pavement method having a particle size distribution passing by%. The particle size distribution of the porous concrete using the first recycled aggregate passes through 100% at 25 mm, 90 to 100% at 20 mm, 20 to 60% at 10 mm, and 0 to 30% at # 4. Production and packaging technology of porous concrete using one type of recycled aggregate, characterized by a concrete pavement method that passes through, passes through 0-10% at # 10 and passes through 0-5% at # 40. The method according to claim 1, wherein the hydrogen peroxide solution is chemically sprayed to improve the physical properties of the porous concrete using one recycled aggregate, a high-pressure sprayer, a high-pressure water and inhalation are performed in parallel, Production and packaging technology for porous concrete using one type of recycled aggregate, characterized by a method of repairing and maintaining the physical properties of the porous concrete in parallel with suction or compressed air.