KR20070003737A - Method for asphalt concrete pavement and method for manufacturing blocks using aggregates reproduced from waste cement concrete - Google Patents

Abstract

An asphalt concrete road pavement method and a block manufacturing method using reclaimed aggregates from waste cement concrete are provided to improve the durability of a pavement or a block by manufacturing asphalt concrete with reclaimed aggregates from waste cement concrete and to make a pavement or a block to have semi-rigidity by using asphalt and cement in the appropriate ratio. An asphalt concrete road pavement method using reclaimed aggregates from waste cement concrete comprises the steps of: crushing waste cement concrete and sorting out aggregates in the appointed particle size distribution to have 8~30 percent porosity; mixing 0.01~0.10 weight percent emulsified asphalt of 1 weight percent reclaimed aggregates from waste cement concrete with 5~50 weight percent water-soluble latex of the amount of the emulsified asphalt used to strength the binding strength of reclaimed aggregates from waste cement concrete; mixing 0.02~0.10 weight percent cement of 1 weight percent reclaimed aggregates from waste cement concrete with water to make asphalt concrete to have 8~30 percent porosity and 0~3-centimeter slump value; and completing a paved road by spreading the produced asphalt concrete and tamping with a roller, or, completing a block having a thickness of 60 cm by inputting the produced asphalt concrete in a mold, vibrating, pressurizing and curing.

Description

Method for Asphalt Concrete Pavement and Method For Manufacturing Blocks Using Aggregates Reproduced From Waste Cement Concrete}

The present invention relates to a method for paving roads with ascon using recycled aggregates of crushed waste cement concrete, and a method for producing blocks.

Waste cement concrete is a kind of waste produced when demolition of roads or buildings paved with cement concrete. These waste cement concretes have been disposed of until a while ago, but recently, as the resource recycling movement became more active, recycled aggregates extracted from them were recycled as low-strength cement concrete, and some were subsidiary bases of road pavement. I use it as a material. However, since most of the waste cement concrete is being used for landfills such as landfills, it is necessary to study the use of waste cement concrete in a direction of higher added value.

However, in the method of producing ascon using recycled cement concrete and using this ascon for road pavement or block manufacturing, the following conditions must be satisfied in order to have practical applicability in terms of economy and convenience. All.

First, the production of ascon should be a room temperature mixing method. In the production of ascon using waste cement concrete recycled aggregates, the heat-mixing method of applying high heat is not suitable. When the waste cement concrete recycled aggregate is heated to a high temperature, the aged cement mortar portion easily adhered to the surface of the recycled aggregate is easily damaged, and cracks are generated in the recycled aggregate due to the high temperature, and thus the durability of the packaging material, etc. Because it drops.

Second, the curing speed of ascon using recycled cement cement aggregate should be fast. If the curing time is delayed after pavement, the opening of vehicles and traffic will be delayed. Considering the enormous amount of traffic these days, the practicality as a pavement material is significantly reduced if the curing period is over 48 hours after pavement. Therefore, curing time should be within 48 hours.

Third, the durability of the products using waste cement concrete aggregate should be excellent. This is because when paving roads or manufacturing blocks using waste cement concrete recycled aggregates, recycled aggregates cannot be used unless the road paving or block durability is secured. Therefore, even when using waste cement concrete recycled aggregates should be as durable as using regular aggregates.

Although much research has been made on the development of waste cement concrete recycled aggregate utilization technology that satisfies these basic conditions, no satisfactory technology has been published.

The present invention was devised to solve the problems of the prior arts, and an object of the present invention is to enable the production of ascone using waste cement concrete recycled aggregate by the normal temperature mixing method, so that curing of the ascone is possible within 48 hours. In addition, the durability of the package or manufactured block laid by this asphalt concrete is improved.

Another object of the present invention is to appropriately adjust the use ratio of asphalt and cement, so that asphalt plays a major role and cement plays a secondary role, so that the package or block has semi-rigid properties. That is, by combining the flexibility of the asphalt and the rigidity of the cement as appropriate to make the semi-stiffness of the intermediate properties.

   Specific technical configurations for implementing the object of the present invention are as follows.

First, in producing ascone using waste cement concrete recycled aggregates, in order to apply the room temperature mixing method, a method should be provided to allow sufficient adhesion between the recycled aggregates (not by heating). To this end, in the present invention, the surface of the recycled aggregate is applied by the emulsified asphalt using an emulsified asphalt so that the emulsified asphalt is absorbed by the aged cement mortar attached to the surface of the recycled aggregate. Aged cement mortar on the surface of the recycled aggregate has a high water absorption rate, and when the emulsion asphalt is applied to the surface of the recycled aggregate, the emulsion asphalt is naturally absorbed by the aged cement mortar on the surface of the recycled aggregate. On the other hand, sufficient emulsification is not secured only by such emulsification of the emulsified asphalt, and in the present invention, a water-soluble latex (Latex) is used to adopt a technical configuration for strengthening the adhesion between the recycled aggregates. Latexes used in the present invention include SBR (Styrene Butadiene Rubber), BR (Butadiene Rubber), NBR (Nitrile Butadiene Rubber) and the like.

Second, in general, when the amount of cement used is more than 120kg in aggregate 1000kg, it becomes rigid. Therefore, in the present invention, the amount of cement used in the 1000 kg of asphalt concrete was in the range of 20-120 kg. As such, when the amount of cement used is small, the cement plays a secondary role while the asphalt plays a main role and thus has semi-rigid properties. In addition, when a small amount of cement is used, the cement acts as a filler and at the same time serves as a water absorber to assist the secondary curing.

Third, in order to shorten the curing time, the moisture contained in the produced ascon should be able to evaporate as short as possible. In the present invention, for this purpose, ascon was configured to have porosity, that is, porosity of 8-30%. That is, in the present invention, the curing rate can be increased by quickly discharging the water contained in the latex and additionally added water, and the ascone produced for this purpose is made of porous. On the other hand, when the asphalt concrete is made porous, the water / cement ratio may be small, thereby reducing the slump value even though the amount of cement used is small, thereby allowing compaction of the roller after installation. And since the compaction of the roller is possible, the strength of the ascon pavement can be increased by the maximum compaction by the roller.

Summarizing the technical configuration of the present invention as seen from above, (1) using an emulsion asphalt and a water-soluble latex to apply the room temperature mixing method, so that they are absorbed by the aging cement mortar adhered to the surface of the recycled aggregates to prevent aging cement mortar To reinforce and further increase the adhesion between recycled aggregates, and (2) use cement at 20-120㎏ for 1ton of recycled aggregates to make the product have semi-rigid properties, and (3) shorten curing time and improve quality. In order to enable compaction, the asphalt concrete is formed to have a porosity of 8-30%.

In the present invention, the control of ascone with a porosity of 8-30% is based on the rapid evaporation of water contained in the water-soluble latex used for improving adhesion and water added for cement hydration reaction and workability. It is performed for two purposes: to induce (to reduce curing time) and to enable compaction by Laura et al. (To improve durability).

Ascon porosity is measured by the maximum theoretical density and measured density, and once the porosity is calculated, the amount of recycled aggregate can be calculated thereby. The formula for calculating porosity and the amount of recycled aggregate used in the formulation design is as follows.

Recycled aggregate usage =

In the above formula, 900 means the volume limiting porosity in the volume 1㎥. Since the volume of 1 m 3 is 1000 l, when the porosity is specified as 10%, 1 m 3 is calculated to 900 l except for the porosity 10%.

In the porosity calculation formula, the measured density means the density measured directly by collecting cores in the field, and the theoretical density is shown in the table below.

 Table 1: theoretical density

division Ascon material Sum Remarks Oil painting asphalt Latex Recycled Aggregate cement water Production mix ratio (kg) A 12 3.6 888.4 60 36 1,000 importance B 1.02 1.00 2.557 3.15 1.00 Volume (ℓ) C 11.76 3.6 347.44 19.05 36 417.85 (D) A / B Volume fraction (%) E 2.81 0.86 83.15 4.56 8.62 100 (C / D) × 00 Absolute Volume Ratio (%) F 28.1 8.6 831.5 45.6 86.2 1,000 Absolute theory density G 28.6 8.6 2126.1 143.6 86.2 2,393.1 F × B

      For example, if the measured density is 2,095, since the theoretical density is 2,393.1 in Table 1 above, the porosity is calculated as follows.

As described above, in order to manage the porosity of 8-30%, the particle size distribution of the waste cement concrete aggregate should be properly determined. Particularly, the particle size distribution of recycled aggregate should be determined in consideration of the use of cement of asphalt concrete using waste cement concrete recycled aggregates different from the amount of cement used in porous cement concrete using general aggregates.

The particle size distribution of the recycled aggregate to secure the porosity of 8-30% in ascon using the cement cement recycled aggregate of the present invention is as follows. Typically, the maximum aggregate size will vary depending on the thickness of the pavement or the thickness of the blocks being manufactured. These particle size distributions are based on the percentage of weight passed through the sieve.

(1) When the maximum size of recycled aggregate is 25mm:

100% pass through 40 mm sieve, 80-100% pass through 25 mm sieve,

 5-60% pass through 5mm sieve, 0-20% pass through 1.2mm sieve,

Pass 0-10% in a 0.6 mm sieve and pass 0-5% in a 0.3 mm sieve.

(2) If the maximum size of recycled aggregate is 19㎜:

100% pass through 25 mm sieve, 80-100% pass through 19 mm sieve,

5-60% pass through 5mm sieve, 0-20% pass through 1.2mm sieve,

Pass 0-10% in a 0.6 mm sieve and pass 0-5% in a 0.3 mm sieve.

(3) For recycled aggregate maximum size 13mm:

100% pass through a 19 mm sieve, 80-100% pass through a 13 mm sieve,

 10-60% pass through 5mm sieve, 5-40% pass through 2.5mm sieve,

0-30% through 1.2 mm sieve, 0-15% through 0.6 mm sieve,

0-10% passing through 0.3 mm sieve.

(4) When the maximum size of recycled aggregate is 8㎜:

100% pass through a 13 mm sieve, 80-100% pass through an 8 mm sieve,

 30-80% pass through 5 mm sieve, 10-60% pass through 2.5 mm sieve,

Through 5-35% in a 1.2 mm sieve, 0-15% in a 0.6 mm sieve,

0-10% passing through 0.3 mm sieve.

(5) If recycled aggregate maximum size is 5㎜:

100% pass through a 10 mm sieve, 80-100% pass through a 5 mm sieve,

5-60% pass through 2.5mm sieve, 0-30% pass through 1.2mm sieve,

Pass 0-15% in a 0.6 mm sieve and pass 0-10% in a 0.3 mm sieve.

As described in the foregoing, the present invention is a waste cement concrete recycled aggregate having the above particle size distribution is mixed with asphalt, emulsion, latex, cement, water, the slump is 0-3cm, the porosity is 8-30% It relates to a method of producing a mixed-temperature ascon, and using the ascon to pave the road, or to manufacture a block.

The paving body or block manufactured by the present invention is a semi-rigid product, which is an intermediate property of asphalt ductility and cement stiffness, by emulsified asphalt, latex, and cement, which is a disadvantage of asphalt. Cement compensates for the weakness, and asphalt compensates for the poor runability of cement, which satisfies both increased durability and improved runability.

In general cement concrete, since the ratio of compressive strength and bending strength is generally 1 / 6-1 / 7 and the bar of compressive strength and tensile strength is 1 / 9-1 / 11, the compressive strength of ordinary cement concrete is 200kg / The flexural strength is in the range of 33-28 kg / cm 2 and the tensile strength is in the range of 22-18 kg / cm 2 based on cm 2. On the contrary, the asphalt concrete of the present invention has excellent compressive strength and low tensile strength. That is, the asphalt concrete of the present invention is 1 / 3-1 / 4 ratio of compressive strength and flexural strength, and the ratio of compressive strength and tensile strength is 1 / 5-1 / 6. The flexural strength is in the range of 40-30 kg / cm 2, and the tensile strength is in the range of 30-24 kg / cm 2. In contrast with the present invention and the compressive strength, flexural strength and tensile strength of the cement concrete, it can be seen that the product of the present invention has a low compressive strength while high bending strength and tensile strength, the quality is stable. Compared with the asphalt mixture, general ascon has a normal compressive strength of 10kg / cm2 based on the ambient temperature of 20 ° C, whereas the product of the present invention has a compressive strength of 120kg / cm2, about 12 times higher, and a test of asphalt concrete properties. The Marshall stability of the general ascon is 500-1000 kg, while the Marshall stability of the product of the present invention is more than three times higher than 3,000 kg, while the dynamic stability is 500-1,500 times / mm, whereas the product of the present invention has 20,000 times / mm. As it is, it is excellent compared to general ascon products.

Hereinafter, the configuration of the present invention will be described in more detail.

First process: A process to classify recycled aggregate into waste cement concrete so as to have a predetermined particle size distribution.

In the present invention, it is to ensure the desired predetermined (8-30%) pores of the waste cement concrete recycled aggregate to be seen in the particle size distribution. Of course, the voids formed by the asphalt concrete of the present invention is not only controlled by the particle size distribution of the aggregate, but also affected by the amount of cement used, water / cement ratio, etc., or managing the particle size distribution of the aggregate of the recycled aggregate is also very important. .

Second process: adding and mixing emulsified asphalt and water-soluble latex.

In order to enhance the adhesive strength between the waste cement concrete recycled aggregate is added and mixed with emulsified asphalt and water-soluble latex. It is preferable to add 0.01-0.10 parts by weight of emulsified asphalt to 1 part by weight of recycled cement concrete aggregate. If the emulsified asphalt is less than 0.01 part by weight, there is a problem in that the emulsified asphalt is not sufficiently applied to the surface of the recycled aggregate. If the emulsified asphalt is more than 0.10 part by weight, the amount of asphalt used is too high, which may adversely affect the product strength. And latex is used SBR, BR, NBR and the amount is preferably used in the range of 5-50% by weight of the emulsion asphalt. If the amount of latex is less than 5% by weight, there is no use effect, and more than 50% by weight of excessive latex may cause material waste. In mixing with the recycled aggregate, it is preferable to mix the mixture of emulsified asphalt and latex together with the recycled aggregate. In addition to SBR, BR, and NBR, use of water-soluble acrylic, EVA, epoxy, etc., has almost the same effect. The use of emulsified asphalt for the waste cement concrete is intended to take advantage of the fact that the aged cement mortar adhering to the surface of the waste cement concrete aggregate has a high water absorption rate.

Aged cement mortar basically has an absorption rate of 5% or more, and when it is simply used as a substitute for general aggregates, the absorption rate of the produced cement concrete is increased to cause phenomena such as freezing and thawing in winter, and the strength of the aged cement mortar part is increased. It is vulnerable and will reduce the durability of the package as a whole. In the present invention, in order to solve this problem, emulsified asphalt is applied to the surface of the recycled aggregate, so that the emulsified asphalt is absorbed into the aged cement mortar attached to the surface of the recycled aggregate. By doing so, firstly, aging cement mortar is reinforced to improve durability, and secondly, it has a dual effect of increasing the bonding strength between recycled aggregates as room temperature asphalt.

Third process: adding and mixing cement and water.

It is preferable to use 0.02-0.10 parts by weight of cement (ie, 20-120 kg of cement based on 1000 kg of recycled asphalt concrete) for 1 part by weight of recycled aggregate. If it is 0.02 parts by weight or less, durability becomes weak, and if it is 0.12 parts by weight or more, it becomes too rigid and is different from the spirit of the present invention.

Water is also added and mixed in this process, which should be used to a minimum to ensure workability and hydration with cement. Water for the hydration reaction with cement is the water / cement ratio theory is applied, the lower the water / cement ratio, the higher the strength, the higher the water / cement ratio, the lower the strength. Ascon of the present invention is porous, moisture is evaporated through the pores, which causes the water / cement ratio is falling, thereby increasing the strength, thereby maximizing the effect of using the cement. Therefore, in the present invention, the water / cement ratio is preferably determined such that the porosity is 8-30% and the slump value is 0-3 cm.

Ascon of the present invention produced by the above process can be used for the manufacture of road pavement and blocks, and also its application form is various, hereinafter the method for paving the road using the ascon of the present invention, and manufacturing the block How to do this is described.

First, a method of paving a road will be described.

In paving the road using the asphalt concrete of the present invention, the asphalt concrete produced by the same process as described above may be transported to a site by a dump truck, laid in a conventional manner, and compacted into a roller.

In order to protect the surface of the road laid by the present invention, the surface protective agent may be sprayed on the upper part of the road surface, and the surface protective agent is 0.5-2 parts by weight of cement and 0.5-2 weight of silica sand of 2 mm or less in 1 part by weight of water. Part, a water-soluble resin may be prepared by mixing one or two or more 0.1-1 parts by weight selected from among the emulsion asphalt, water-soluble latex, epoxy water-soluble acrylic, EVA. And when coloring is needed, what is necessary is just to mix and use a pigment within 20 weight% of the said cement usage amounts to the said surface protective agent.

In the case of permeability (porosity), the surface protector as described above should be sprayed immediately after laying and compacting the recycled aggregate ascon of the present invention. It is suitable to spray 50-300kg / m2 after the evaporation of moisture after 3 hours of laying and compacting recycled aggregate ascon.

On the other hand, when it is desired to make the surface of the road laid by the present invention beautiful, it is possible to lay another surface layer on top of the road surface placed.

At this time, as the surface layer laid on the top, (A) 1 part by weight of the general aggregate of 13 mm, 10 mm, 5 mm, 3 mm or 1.5 mm cement: 0.2-0.4 part by weight, water: 15-40 weight of the amount of cement used If necessary, the pigment is used within the range of 10% by weight of the amount of cement used. The water permeability is less than 10% by weight in the 0.5 mm sieve, and the impermeability is greater than 10% by weight in the 0.5 mm sieve. And mix it, install it on top of the ascon pavement and compact it with Laura, complete by installing and curing joints, or (B) laying and compacting colored natural stone aggregate of the same size in the surface forming material as above. , By spraying steam or water on top of the natural stone to project the joint and curing, or (C) to express the natural stone as shown above, ocher, white soil, red soil, black soil, charcoal, etc. Use in the range of -50% by weight It can be completed with eco-friendly surface. And when the heavy vehicle is expected to pass on the road to be installed and it is necessary to strengthen the compressive strength, (D) after laying and compacting the recycled aggregate ascon of the present invention, one day after the coating is sprayed on the top After that, general asphalt, modified asphalt, drained asphalt, and colored asphalt may be laid and compacted to form a surface layer.

In the case where the elastic packing is to be installed, (E) after laying, compacting and curing the recycled aggregate ascon of the present invention, the urethane, epoxy and primer are sprayed in the surface air condition, and the urethane of 5 mm or less on the upper part thereof. After mixing and placing 0.1-0.3 parts by weight of a urethane binder in at least 1 part by weight selected from chips, EPDM chips, and crushed waste tire chips, finish the surface by using a trowel, a heating roller, and curing.

The following describes a method for producing a block using the recycled aggregate ascon of the present invention.

In manufacturing a block using the recycled aggregate ascon of the present invention, as in the conventional block production, the ascon of the present invention may be placed in a mold to form a block by vibrating, pressing, and compacting, and then curing the block.

In the block manufacturing, the lower layer may be formed of the asphalt concrete of the present invention, and a separate upper layer may be formed thereon. In the case where the upper layer is formed separately, the recycled aggregate ascon of the present invention is first added to vibrate, pressurize or vibrate to form a lower layer, and on the upper part of silica sand 1 part by weight of cement: 0.2-0.5 part by weight, water: water 15-25% by weight of the amount of cement used, pigments: 10% by weight or less of the amount of cement used as needed, by mixing in a secondary, and vibration pressurized to form an upper layer.

At this time, the upper layer may be formed permeable or non-permeable. If you want to form permeable, the aggregate (silica) used for the upper layer may be used to pass 10 wt% or less in a 0.5 mm sieve. In the case of forming to be impermeable, a material that passes by at least 10% by weight in a 0.5 mm sieve may be used.

On the other hand, in the case of manufacturing the block in an environmentally friendly manner, in forming the upper layer, ocher, white clay, red clay, black soil, charcoal, and the like may be used as 10-50% by weight of the amount of cement used. In addition, in order to give a feeling of natural stone on the surface of the upper layer, natural stone gravel is used as aggregate, and the surface is sprayed with steam or water to protrude the natural stone by 30% or more of its surface area, and curing it. In addition, in the case of using the recycled aggregate ascon of the present invention as a lower layer, if the elastic layer consisting of the upper layer having elasticity and the regenerated aggregate of the present invention and the lower layer having no elasticity are intended to be used, (1) (2) 0.1-0.3 parts by weight of a urethane binder is mixed with 1 part by weight of an elastomeric chip such as urethane chips, EPDM chips or crushed waste tire chips of 10 mm or less in a separate mold as an upper layer. (3) After spraying the urethane primer on one side of the lower layer block, which had been cured before, and (4) the surface on which the urethane primer of the lower layer block was sprayed on the mold containing the upper layer block. The urethane primer of the lower layer block and the urethane binder of the upper layer block are brought into contact with each other, and then (5) vibrated and pressed to form , And when heating the block formed in this way (6) to the natural curing or below 50 ℃.

In the manufacture of the block, it is also possible to form a pattern of various shapes on the upper portion of the block by using the platen formed with unevenness, it is also possible to produce a block with a blind braille, a block having slip resistance and the like. The block of this kind is formed of two layers (the upper layer having a pattern, the lower layer using the recycled aggregate of the present invention), as in the above-mentioned elastic block, the process of manufacture and the material used are Is the same as It is only distinguished by whether or not the braille or the pattern is engraved on the surface.

As seen above, the recycled aggregate ascon of the present invention has a wide range of applications, and in particular, the present invention can be applied to almost all kinds of blocks, such as sidewalk blocks, shore banks, vegetation blocks, boundary blocks in the manufacture of blocks.

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

(Example 1)

In the present embodiment, a parking lot having a length of 50m x 100m and a paving thickness of 15cm is to be packed. The pavement is divided into base layer and surface layer and packed into two layers. The base layer is 10cm thick but the aggregate is the waste cement concrete recycled aggregate using the largest dimension 25mm and the surface layer is 5cm thick. Packaged with aggregate ascon.

The process of this embodiment is as follows.

Step 1: After mixing 1000kg of waste cement concrete recycled aggregate and 30kg of emulsified asphalt with the particle size distribution of Table 2 below, 90kg of cement and 28.5kg of water are mixed and transported by dump truck to install as a wheel loader. After compacting 3 times with Damlor, 3 times with Tirero, and 3 times with Tandem Rora, after spraying emulsified asphalt to 90 kg / 100m <2>, it cured for 24 hours.

Table 2: Particle Size Distribution of Waste Cement Concrete Recycled Aggregate

Checker () % Sieve weight ratio 40 25 5 1.2 0.6 0.3 standard 100 80-100 5-60 0-20 0-10 0-5 Particle size distribution 100 100 31.7 5.3 3.2 0.6

2nd process: Ascon of a general aggregate was laid in 5 cm thickness on the upper part of the base layer installed in the electrical process, and it compacted and cured by a conventional method, and then opened the vehicle.

Stability, compressive strength and tensile strength were tested for the roads laid by this example, and the test results are shown in Table 3 below.

Table 3: Test result of Example 1

Test Item (Unit) Test result standard Stability (kg) 4300 More than 500 Compressive strength (㎏ / ㎠) 148 - Flexural strength (㎏ / ㎠) 46 45 or more Tensile Strength (㎏ / ㎠) 36 -

As shown in the test results of Table 3 above, the stability of the pavement was more than the standard, and the hardness was 46㎏ / ㎠ and was suitable as the pavement as the standard, and the tensile strength was much higher than that of general cement concrete. High quality was found to be stable.

(Example 2)

In this embodiment, a high-pressure block of 230 mm in length x 115 mm in width x 60 mm in thickness was prepared from ascon using recycled cement concrete aggregate. The particle size distribution of the waste cement concrete recycled aggregate used in this example is shown in Table 4.

Table 4: Particle Size Distribution of Waste Ascon Aggregates

Checker (mm) Sieve weight percentage (%) 19 13 5 2.5 1.2 0.6 0.3 standard 100 80-100 10-60 5-40 0-30 0-15 0-10 Test result 100 100 30.4 12.7 2.9 1.6 0.8

This example was carried out by the following process.

First step: 1,000 kg of waste cement concrete recycled aggregate having particle size distribution of Table 4 above, 35 kg of emulsion asphalt (RSC-4), 2.5 kg of SBR latex (40% of solid content), and then mixed 115 kg of cement and 21 kg of water. Was mixed.

Second step: The mixture of the above step was put into a predetermined mold, vibrated and pressed to form a thickness of 60 cm, and then the mold was removed.

Third step: The block formed in the electrical process was moved to a curing room to cure for 10 hours to complete the block.

The flexural strength, tensile strength and porosity of the blocks manufactured according to the present example were measured. The measurement results are shown in Table 5 below.

Table 5: Test result of Example 2

Item Flexural strength (kg / ㎡) Tensile Strength (kg / ㎠) Porosity (%) Measurement result 55 42 8.7 standard 50 or more - 8 or more

As shown in the test results of Table 5, the flexural strength and porosity of the block of Example 2 prepared by applying the present invention was above the standard, the tensile strength was also very good.

(Example 3)

In the present embodiment, a block having a permeability of 1 × 10 ⁻² cm / sec or more and a porosity of 12% or more and having a size of 230 mm × 135 mm × 80 mm and a color of red is decided. And the block of the present embodiment is to form a lower layer of ascon using cement cement recycled aggregate, the upper layer is to produce a block formed of cement concrete using silica sand. The particle size distribution of the waste cement concrete recycled aggregate used in this example is shown in Table 6.

Table 6: Particle Size Distribution of Recycled Aggregate for Waste Cement Concrete

  Sieve size () % Sieve weight ratio 25 19 5 1.2 0.6 0.3 standard 100 80-100 5-60 0-20 0-10 0-5 Test result Recycled Aggregate 80 90.4 21.5 5.4 1.2 0.1 sand 20 100 100 25.4 11.6 0.3 Composite particle size 100 92.3 37.2 9.4 3.3 0.1

This example was carried out by the following process.

The first step: 1,000kg of waste cement concrete recycled aggregate having a particle size distribution of Table 6 above (800 kg of coarse aggregate, 200 kg of sand), 20 kg of emulsion asphalt (RSC-4), 3 kg of SBR latex (40% of solid content), 115 kg of cement and 25 kg of water were mixed.

Second step: The mixture of the above step was put in a predetermined mold to vibrate and pressurized to have a thickness of 65 mm.

Third step: 400 kg of cement, 60 kg of water, and 14 kg of pigment (red) were mixed with 1800 kg of silica sand passing 100% through a 5 mm sieve and 2.0% through a 0.5 mm sieve.

4th process: The mixture of the above process was put into the upper part of the molded object of the 2nd process frame for 2nd time, and it vibrated and pressurized so that the total thickness might be 80 mm.

5th step: After removing the mold, transfer to curing room and dry by curing at 25 ℃ of air temperature, red permeable block of lower layer of ascon of cement cement recycled aggregate and upper layer of cement concrete using silica sand as aggregate Was completed.

The block manufactured according to the present embodiment was tested for bending strength, tensile strength, porosity, and permeability coefficient. The test results are shown in Table 7 below.

Table 7: Test results of Example 3

Item Flexural strength (㎏ / ㎠) Tensile Strength (㎏ / ㎠) Porosity (%) Permeability coefficient (cm / sec) Test result 67 51 16.9 4.5 × 10 ^-2 standard 35 or more - 12% or more 1 × 10 ^-2 or more

As shown in the test results of Table 7, the flexural strength, porosity, and permeability coefficient of the example block to which the present invention was applied were above the standard, and the tensile strength was also very good.

The present invention enables the production of ascone using waste cement concrete by the normal temperature mixing method, the curing of the ascone within 48 hours, and to improve the durability of the package or manufactured block laid by the ascone. At the same time, the flexibility of the asphalt and the stiffness of the cement are appropriately combined to achieve the semi-rigidity of intermediate properties.

The present invention can be applied to a variety of applications, to secure the aesthetics of the surface in the manufacture of blocks, may be used environmentally friendly, may be formed of an elastic body, braille block, anti-slip block, revetment block Or it may be applied to reinforcement earth block. Therefore, the present invention is to be very advantageous to provide a variety of ways that the waste cement concrete recycled aggregate can be substantially recycled.

Claims (21)

In classifying aggregate by crushing waste cement concrete, when the maximum size of aggregate is 25mm, 100% passes through 40mm sieve, 80-100% passes through 25mm sieve, 5-60 through 5mm sieve Percentage aggregates that pass%, pass 0-20% in a 1.2 mm sieve, pass 0-10% in a 0.6 mm sieve, and pass 0-5% in a 0.3 mm sieve, classify aggregates with a maximum size In the case of 19 mm, 100% pass through 25 mm sieve, 80-100% pass through 19 mm sieve, 5-60% pass through 5 mm sieve, 0-20% pass through 1.2 mm sieve, 0.6 mm sieve Classify aggregates with a particle size distribution that passes 0-10% at, and passes 0-5% at 0.3 mm sieve, when the aggregate maximum size is 13 mm, 100% passes through a 19 mm sieve, and 80 on a 13 mm sieve -100% pass through, 10-60% pass through 5mm sieve, 5-40% pass through 2.5mm sieve, 0-30% pass through 1.2mm sieve, 0-15% pass through 0.6mm sieve, 0-10% pass through 0.3 mm sieve Classifies aggregates of the particle size distribution, when the aggregate maximum size is 8 mm, 100% passes through 13 mm sieve, 80-100% passes through 8 mm sieve, 30-80% passes through 5 mm sieve, Classify aggregates with a particle size distribution of 10-60% in a 2.5 mm sieve, 5-35% in a 1.2 mm sieve, 0-15% in a 0.6 mm sieve, and 0-10% in a 0.3 mm sieve. When the maximum size of the aggregate is 5mm, 100% passes through a 10mm sieve, 80-100% passes through a 5mm sieve, 5-60% passes through a 2.5mm sieve, and 0-30% through a 1.2mm sieve. Sorting the aggregate of the particle size distribution passing through, passing 0-15% in a 0.6 mm sieve and passing 0-10% in a 0.3 mm sieve; Mixing 1 part by weight of the aggregate classified by the above step with 0.01-0.10 parts by weight of emulsion emulsion and latex corresponding to 5-50% by weight of the amount of asphalt used; Mixing the mixture of the above process with 0.02-0.12 parts by weight of cement and water with respect to 1 part by weight of the aggregate to produce ascon having a porosity of 8-30% and a slump value of 0-3 cm; And Ascon road paving method using waste cement concrete recycled aggregate comprising a; step of laying the asphalt concrete produced in the electrical process in a conventional manner and compacting with a roller. The method according to claim 1, for the surface protection, after laying and compacting the ascon, emulsified as 0.5-2 parts by weight of cement, 0.5-2 parts by weight of silica sand of 2 mm or less, water-soluble resin on 1 part by weight of water Ascon road paving method using waste cement concrete recycled aggregate, comprising the step of spraying 10-300 kg / m 2 of a surface protective agent mixed with one or two or more 0.1-1 parts selected from asphalt, water-soluble latex, epoxy water-soluble acrylic, and EVA. . The asphalt concrete paving method using waste cement concrete recycled aggregate according to claim 2, wherein the surface protective agent is mixed with a pigment within 20% by weight of the amount of the cement used. The method for paving asphalt concrete using waste cement concrete recycled aggregate according to claim 2 or 3, wherein in the case of water permeability, the surface protective agent is sprayed 10-50 kg / m 2 before the moisture is evaporated after the asphalt concrete is laid and compacted. The waste cement concrete reclaimed aggregate according to claim 2 or 3, wherein in the case of water impermeability, 50-300 kg / m 2 spraying of the surface protective agent is carried out after the evaporation of water after 3 hours or more after laying and compacting the ascon. Used Ascon road pavement method. According to claim 1, After placing and compacting the asphalt concrete, 0.1-0.3 parts by weight of a urethane binder is mixed with one or more selected from the group consisting of urethane primer, urethane chip, EPDM chip, waste tire, Ascon road paving method using waste ascone recycled aggregates, which surface is cured, cured and finished in a conventional manner. The method according to claim 1 or 2, wherein 1 part by weight of general aggregate of 13 mm, 10 mm, 5 mm, 3 mm or 1.5 mm is cement: 0.2-0.4 part by weight, and water: 15-40% by weight of the amount of cement used. An ascon road paving method using waste cement concrete recycled aggregates, wherein the mixed mixture is laid on top of the surface layer, compacted with a roller in a conventional manner, and jointed and cured to form a top layer. According to claim 7, In the case of permeability, the general aggregate is ascon road paving method using waste cement concrete recycled aggregate that is passed by less than 10% by weight in a 0.5mm sieve. The method of claim 7, wherein the general aggregate is a colored natural stone aggregate, and after laying and compaction of the top layer, by spraying steam or water on the top layer to protrude the natural stone, asphalt concrete paving method using asphalt recycled aggregate. 8. The method of paving asphalt concrete using waste cement concrete recycled aggregate according to claim 7, wherein loess, white clay, red clay, black clay or charcoal is used in the range of 10-50% by weight of the top cement usage. The method according to claim 1 or 2, wherein, in order to strengthen the surface, the coating is applied to the upper portion, and thereafter, one selected from ordinary ascone, modified ascone, drainable ascone, and colored ascone is formed to form a surface layer. Ascon road paving method using waste ascon recycled aggregate. In classifying aggregate by crushing waste cement concrete, when the maximum size of aggregate is 25mm, 100% passes through 40mm sieve, 80-100% passes through 25mm sieve, 5-60 through 5mm sieve Percentage aggregates that pass%, pass 0-20% in a 1.2 mm sieve, pass 0-10% in a 0.6 mm sieve, and pass 0-5% in a 0.3 mm sieve, classify aggregates with a maximum size In the case of 19 mm, 100% pass through 25 mm sieve, 80-100% pass through 19 mm sieve, 5-60% pass through 5 mm sieve, 0-20% pass through 1.2 mm sieve, 0.6 mm sieve Classify aggregates with a particle size distribution that passes 0-10% at, and passes 0-5% at 0.3 mm sieve, when the aggregate maximum size is 13 mm, 100% passes through a 19 mm sieve, and 80 on a 13 mm sieve -100% pass through, 10-60% pass through 5mm sieve, 5-40% pass through 2.5mm sieve, 0-30% pass through 1.2mm sieve, 0-15% pass through 0.6mm sieve, 0-10% pass through 0.3 mm sieve Classify aggregate in the particle size distribution, and when the aggregate maximum size is 8 mm, 100% passes through a 13 mm sieve, 80-100% passes through an 8 mm sieve, and 30-80% passes through a 5 mm sieve, Classify aggregates with a particle size distribution of 10-60% in a 2.5 mm sieve, 5-35% in a 1.2 mm sieve, 0-15% in a 0.6 mm sieve, and 0-10% in a 0.3 mm sieve. When the maximum size of the aggregate is 5mm, 100% passes through a 10mm sieve, 80-100% passes through a 5mm sieve, 5-60% passes through a 2.5mm sieve, and 0-30% through a 1.2mm sieve. Sorting the aggregate of the particle size distribution passing through, passing 0-15% in a 0.6 mm sieve and passing 0-10% in a 0.3 mm sieve; Mixing 1 part by weight of the aggregate classified by the above step with 0.01-0.10 parts by weight of emulsion emulsion and latex corresponding to 5-50% by weight of the amount of asphalt used; Mixing the mixture of the above process with 0.02-0.12 parts by weight of cement and water with respect to 1 part by weight of the aggregate to produce ascon having a porosity of 8-30% and a slump value of 0-3 cm; And A process for producing waste cement concrete recycled aggregates, comprising: a step of putting the ascon produced in the electric process into a mold by a conventional method, vibrating, pressing, and compacting to form a block and curing the same. The method of claim 12, wherein the ascon is formed with a lower layer, and the upper part of the aggregate is mixed with cement: 0.2-0.5 parts by weight, water: 15-25% by weight of the amount of cement used in the secondary mixing and vibration Block manufacturing method using waste cement concrete recycled aggregate, which is pressed to form an upper layer. The block manufacturing method according to claim 13, wherein a pigment is used in the mixture of the upper layer at 10% by weight or less of the amount of cement used. The block manufacturing method according to claim 13, wherein, in the case of water permeability, the general aggregate passes through 10% or less in a 0.5 mm sieve. The method for manufacturing a block using waste cement concrete recycled aggregate according to claim 13, wherein, when it is impermeable, the general aggregate passes through at least 10% in a 0.5 mm sieve. The block manufacturing method according to claim 13, wherein, in the mixture of the upper layer, loess, white clay, red clay, black clay or charcoal is used in an amount of 10-50% by weight of the amount of cement used. The method of claim 13, wherein the general aggregate is a colored natural stone aggregate, and after the vibration and pressurization of the upper layer to spray natural steam by spraying steam or water thereon, a method for producing blocks using recycled cement concrete aggregate. 14. The urethane chip, EPDM chip, or pulverization according to claim 13, wherein (1) a block formed by using the ascon as the lower layer is separated from the mold and cured. After mixing 0.1-0.3 parts by weight of a urethane binder to 1 part of waste tire chips to clean up the surface, (3) after spraying a urethane primer on one surface of the lower layer block cured before, (4) the upper layer block is The urethane primer of the lower layer block is placed face down on the mold, and the urethane primer of the lower layer block and the urethane binder of the upper layer are brought into contact with each other. ) A block manufacturing method using waste cement concrete recycled aggregate comprising the step of curing the molded block in this manner in a conventional manner. 20. The method of claim 19, wherein a blind braille pattern or a slip resistant pattern is formed on a surface of the upper layer. The method for manufacturing a block according to claim 12 or 13, wherein the produced block is one of a sidewalk block, a revetment block, a vegetation block, a boundary block, and a reinforced earth block.