KR101134459B1 - Cement concrete making method using micro and macro fiber and the cement concrete, the paving method therewith - Google Patents

Abstract

In the concrete pavement comprising dry bibimbly powder and blended water, microbial and macrofibers are incorporated in the bibibimbold powder in a volume ratio of 1: 1 to 1: 3, wherein the macrofibers are Disclosed are a method for producing concrete pavement using microfibers and macrofibers, and a concrete pavement and concrete pavement method using the same.

Thus, by the effective crack control after the concrete pavement construction can be more economical and efficient pavement construction and maintenance costs can be reduced.

Concrete pavement, textile, construction

Description

Method of manufacturing concrete pavement using microfiber and macrofiber, method of concrete pavement and concrete pavement using same {CEMENT CONCRETE MAKING METHOD USING MICRO AND MACRO FIBER AND THE CEMENT CONCRETE, THE PAVING METHOD THEREWITH}

The present invention relates to a concrete pavement manufacturing method using microfibers and macrofibers, and a concrete pavement and concrete pavement construction method using the same. More specifically, in the concrete pavement manufactured to the prescribed flexural strength, the concrete pavement manufacturing method and pavement produced by the method effective in controlling cracking after construction of the concrete pavement by incorporating micro and macro fibers, It is about old construction method.

In general, road pavement is roughly divided into asphalt concrete pavement (hereinafter referred to as asphalt pavement) or cement concrete pavement (hereinafter referred to as concrete pavement).

In the case of domestic construction, asphalt pavement with excellent ride comfort and running characteristics is mainly used, but such asphalt pavement has a disadvantage in that water resistance is not preferable in terms of maintenance.

The cost is somewhat high, but the proportion of concrete pavement, which is excellent in durability and can reduce maintenance costs, is gradually increasing.

However, this concrete paving is a road paving work using cement, aggregate, and water, which are general concrete materials, which are the disadvantages of concrete in the event of reflection cracking and continuous loads caused by plasticity and drying behavior of the lower base. There was a disadvantage that the cracking and breakage of the concrete occurs due to the tensile performance.

Accordingly, there was an example in which fibers were used in concrete to compensate for the above disadvantages in the concrete pavement concrete formulation.

However, this was only used for the purpose of compensating the fine aggregate in the permeable slab paving construction, and the effect on the actual bending strength and tensile strength has not been verified.

Furthermore, general fiber reinforced concrete was mainly used for micro fiber (about 15 mm in length or less).

Korean Patent Laid-Open Publication No. 2005-00187444 discloses polyethylene (PE) fiber, polyvinyl alcohol (PVA) fiber or polypropylene (PP) fiber as a micro fiber in a high toughness cement composite, and a steel fiber (SF) or steel cord or An example of incorporating polyvinyl alcohol (PVA) fibers as macrofibers to provide a volumetric ratio of 1.22-3% of the volume of the cement matrix has been introduced.

However, this is the case that is used in the manufacture of general-purpose concrete, its use is the deformation hardening behavior that increases the stress with the increase of the strain again without the decrease of the stress even after the initial cracking under the action of bending and tensile load In order to be able to exhibit multiple crack characteristics uniformly occurring in a plurality of microcracks in the overall, it was only a reference to apply directly to concrete pavement.

In other words, considering that aggregate used mainly in concrete pavement is more than 32 mm (the size of aggregate represented by the nominal dimension of the minimum size of the body at 90% or more by weight), it is possible to achieve a single microfiber mixing performance. There was no problem that there was no clear solution for reflection cracking and continuous load that required tensile performance when using only microfibers.

In addition, since there is no domestic KS standard for domestic concrete pavement, it is being poured in accordance with the minimum standard based on the concrete pavement guidelines published by the Ministry of Land, Transport and Maritime Affairs.

Therefore, the test criteria in the curing state indicated in the above guidelines are based on the flexural strength of only 4.5 MPa in 28 days, and the concrete pavement concrete is being poured in accordance with this standard.

Therefore, concrete pavement formulation which is poured by existing guideline of flexural strength of 4.5 MPa or more is difficult to control reflection cracks, various shrinkage cracks, breakage due to sustained loads, and can effectively control the damage of concrete pavement. There is a need to develop a method for manufacturing a package.

Therefore, the present invention is to solve the technical problem to be able to control the various cracks in the concrete pavement is simply defined only the flexural strength by ensuring the bending performance and tensile performance at the same time in the concrete pavement. .

Therefore, through the basic research of conventional fiber-reinforced concrete, the present invention is very effective for strengthening the tensile performance when the macro fiber is mixed, and it is very effective for strengthening the bending performance when the micro fiber is mixed. It is possible to manufacture reinforced concrete pavement and its construction method with the optimum fiber composite mixing ratio which can derive the tensile performance of macro fiber at the same time.

Therefore, the present invention is to strengthen the bending performance by using the micro-fiber mainly used in the manufacture of fiber-reinforced concrete, and to simultaneously strengthen the tensile performance by using the macro fiber.

In general, the fiber used for the purpose of reinforcing the flexural toughness of concrete is generally used short microfibers of about 12 mm or less, but in the present invention, the aggregate size used for concrete pavement (minimum in weight to pass 90% or more by weight) In consideration of the nominal dimensions of the aggregates, the length of the aggregate was used in consideration of the length of 32mm or more.

That is, in the concrete pavement body which comprises dry beam powder and compounding water,

The microbial and macrofibers were mixed in the volume ratio of 1: 1 to 1: 3 in the dry beam beam powder, but the macrofibers were used so that their length was at least 30 mm or more.

In addition, the concrete pavement step of mixing the water and air entrainer to produce a blended water; And formulating the blended water in a dry beam powder,

The dry beam beam powder is prepared by mixing 180 to 260 parts by weight of sand, 140 to 200 parts by weight of aggregate of 20 mm size, 165 to 230 parts by weight of aggregate of 32 mm size, based on 100 parts by weight of cement,

Based on 100 parts by weight of cement, the blended water is prepared by mixing 99.97 to 99.9995 parts by weight, and the air entrainer 0.005 to 0.03 parts by weight,

The weight ratio of the dry beam beam powder and the blended water was set to 0.4 to 0.5.

Furthermore, the microfibers are made of nylon, and the macrofibers are made of polyvinyl alcohol, but the volume ratio of the nylon and the polyvinyl alcohol is 1: 1.

According to the present invention, in the concrete pavement, which is not otherwise defined in the tensile crack control, it is possible to control not only the flexural tensile cracking but also the tensile cracking, so that the maintenance of the concrete pavement becomes more effective.

The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the present invention. Should be.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

<Micro fiber and macro fiber>

First, the fibers used in the present invention are largely micro fibers and macro fibers, but in the case of micro fibers, nylon may be used as shown in FIG. 1.

The nylon (NY) is mixed with cement, aggregate, and water in the concrete mix for concrete pavement, and is used to secure bending performance in concrete pavement.

In addition, the microfiber may be divided into characteristics by density, shape ratio (ratio of cross-sectional area to length), length, and diameter, and the microfiber for securing concrete pavement bending performance by the compounding is not limited thereto. Other microfibers can be used.

In the case of the macrofiber used in the present invention, as shown in Figures 2a, 2b, 2c, 2d and 2e, PP1 (polypropylene diameter 0.89mm), PP2 (polypropylene diameter 0.6 ~ 1.0mm mixed, PP1 and PP2 have different diameter ranges, PP3 (polypropylene and polyethylene terephthalate synthesis), PVA (polyvinyl alcohol), ST (steel fiber), and these macrofibers are also cemented in concrete pavement concrete mix. It is mixed with aggregate, water and used to secure tensile performance in concrete pavement. Thus, looking at the characteristics of each of the macro fibers as shown in [Table 1] below will be able to use at least one of them selected.

division PP1 PP2 PP3 PVA ST density 0.91 0.91 0.91 1.30 7.86 Aspect ratio 56 50-83 75-100 45 65 Length (mm) 50 50 30 30 35 Diameter (mm) 0.89 1.6-1 0.3-0.4 0.66 0.54

In particular, in the present invention, as shown in Table 2 below, nylon (NY) was used as the microfiber, and polyvinyl alcohol (PVA) was used as the macrofiber, and each density, shape ratio, length, and diameter were as follows. Able to know.

Micro fiber Macrofiber division NY (nylon) PVA (polyvinyl chloride) density 1.16 1.30 Aspect ratio 1000 45 Length (mm) 12 30 Diameter (mm) 0.012 0.66

In this case, in particular, it can be seen that the length of the macro fiber 30mm is used. The reason for using the macro fiber having such a length is that the aggregates (cement) are bound to these aggregates because the aggregate size of 32mm is used in concrete pavement. In order to compensate for this (strengthening performance), a 30mm length macro fiber is used.

Figure 3 shows the experimental value for the strength ratio of concrete reinforced with microfibers and macrofibers, the horizontal axis represents the fiber type and the vertical axis represents the strength ratio of the concrete reinforced with each fiber to the strength of the pavement concrete not fiber reinforced It is shown.

Accordingly, it can be seen that according to FIG. 3, it is not possible to satisfy the required tensile performance improvement by simply mixing two kinds.

In addition, according to Figure 3, it can be seen that the experimental example of the bending strength and tensile strength of the macro fiber, the bending strength and tensile strength of each fiber is 1: 1 of NP1 (NY (nylon) and PVA (polyvinyl chloride)) It can be seen that the most suitable is 0.2 volume part to 100 volume part of concrete pavement.

Here, mixing means adding fibers to the package without changing the volume of the package.

<Example of manufacture of concrete package>

The formulation of the concrete pavement according to the invention basically comprises cement, aggregate and water.

These formulations are basically formulated to the 4.5 MPa design base strength found in the Cement Concrete Pavement Mixtures Guide.

Aggregate was formulated into 32mm coarse aggregate (size of aggregate with the nominal size of the body at the minimum body weight passing 90% by weight), coarse aggregate 20mm, and fine aggregate (sand), which was used for the cement cement pavement formulation guide. This is to match the particle size distribution when using the maximum 32mm aggregate suggested in the KS standard.

For example, a water / cement ratio (W / C, weight percentage) of 40 to 50% and a unit amount of 140 to 150 kg / m ³ can be obtained to ensure a predetermined bending strength, based on this

Based on 100 parts by weight of cement, based on 180 to 260 parts by weight of sand, 140 to 200 parts by weight of aggregate having 20 mm size, and 165 to 230 parts by weight of aggregate having 32 mm size.

The reason why the size of each sand and aggregate is used in this way is to comply with the particle size distribution of the aggregate that should be matched when using the maximum aggregate size of 32mm suggested in KS F 2526.

The range of each compound is determined by the ratio of sand and aggregate (grain aggregate ratio), water cement ratio, unit quantity, etc. The water / cement ratio is defined as 50% or less in the packing manual (45% or less in consideration of durability). Since the quantity is regulated to be 150 kg / m ³ or less, it is adjusted accordingly and there is no special standard for the ratio of sand and aggregate (remaining aggregate ratio).

Therefore, in the present invention, the water cement ratio and the unit quantity are limited to a range that can be expressed more than the reference strength value (bending strength 4.5 MPa) within the range suggested by the reference, and the amount of sand and aggregate is used to determine the water cement ratio and unit quantity. Therefore, the minimum maximum value is determined by changing.

After all, the cement, sand, aggregate is determined based on the required water / cement ratio and the unit quantity will be possible in a variety of combinations.

Looking specifically at the production of such concrete pavement,

Preparing a blended water by mixing water and an air entrainer; And formulating the blended water in a dry beam powder,

The dry beam beam powder is prepared by mixing 180 to 260 parts by weight of sand, 140 to 200 parts by weight of aggregate of 20 mm size, 165 to 230 parts by weight of aggregate of 32 mm size, based on 100 parts by weight of cement,

Based on 100 parts by weight of cement, the blended water is prepared by mixing 99.97 to 99.9995 parts by weight, and the air entrainer 0.005 to 0.03 parts by weight,

The weight ratio of the dry bibeam powder and the blended water is to be 0.4 ~ 0.5.

Accordingly, the micro-fibers are mixed with 0.1 to 0.3 parts by volume and 0.1 to 0.3 parts by volume of the macrofibers with respect to the concrete pavement by mixing cement, aggregate and water. In other words

In the concrete pavement comprising the dry beam powder and the blended water,

The microbial and macrofibers are mixed in the dry ratio beam powder at a volume ratio of 1: 1 to 1: 3 (the method of further mixing the fibers without changing the package volume is called mixing).

As such a mixing method, dry cemented powder is manufactured by mixing cement, aggregate, microfiber and macrofiber required for 30 seconds in a high speed mixer at a speed of 20 RPM.

After mixing the mixed water in the gunbi beam powder for 30 seconds at a high speed mixer at 30 RPM

To prepare a concrete pavement according to the present invention by mixing the water reducing agent 0.1 ~ 0.5 parts by weight (preferably 0.28 parts by weight) based on 100 parts by weight of the mixture in a high speed mixer at 40 RPM for 90 seconds. Can be.

<Comparative Example of Blending for Manufacturing Concrete Package>

Therefore, the present invention is to test the tensile strength and flexural strength of the plain concrete pavement using no microfibers and macrofibers, concrete pavement using only microfibers, concrete pavement using microfibers and macrofibers, respectively. Same as

First, the plain concrete pavement (fiber-free concrete pavement) is 196 parts by weight of sand, 145 parts by weight of 20 mm aggregate, and 176 parts by weight of 32 mm aggregate based on 100 parts by weight of cement. Based on 100 parts by weight of 99.98 parts by weight of water and 0.02 parts by weight of the air entrainer was prepared by the ratio of 0.423 to the ratio of the dry beam beam powder,

The concrete pavement using only microfibers or macrofibers is based on 100 parts by weight of cement, respectively, 196 parts by weight of sand, 145 parts by weight of aggregate of 20 mm, and 176 parts by weight of aggregate of 32 mm. A concrete pavement was manufactured such that the ratio of the blended water consisting of 99.98 parts by weight of water and 0.02 parts by weight of the air entrainer and the dry beam beam powder was 0.423, and 0.2 microvolume of microfibers or macrofibers was added to 100 parts by volume of the concrete pavement. Was prepared by mixing wealth,

The concrete pavement using the micro fiber and macro fiber is based on 100 parts by weight of sand 196 parts by weight, 145 parts by weight of aggregate of 20 mm size, 176 parts by weight of aggregate of 32 mm size on the basis of 100 parts by weight of cement in dry beam powder A concrete pavement was manufactured so that the ratio of the blended water consisting of 99.98 parts by weight of water and 0.02 parts by weight of the air entrainer and the dry beam beam powder was 0.423, and microfibers and macrofibers were 1: 1 for 100 parts by volume of the concrete pavement. It is manufactured by mixing 0.2 volume part as a ratio.

That is, according to Figure 4, when using only the micro fiber (NY (MICRO)) compared to the plain concrete pavement (PLAIN, concrete pavement without fibers) or of the concrete pavement using only macro fibers (PVA (MACRO)) In this case, it can be seen that the tensile strength is greater than that of the plain concrete pavement based on the age of 28 days, and the concrete pavement using only macrofiber is very effective in the tensile strength.

In addition, in the case of concrete pavement (NY + PVA) using both microfibers and macrofibers, the tensile strength of the concrete pavement and the concrete pavement using only microfibers was improved, but the tensile strength was lower than that of concrete pavements using only macrofibers. It can be seen that.

In conclusion, in order to secure sufficient tensile strength in concrete pavement, it is most preferable to use concrete pavement using only macrofiber, and concrete pavement using both microfiber and macrofiber is advantageous in terms of securing tensile strength. Can be.

According to FIG. 5, when only microfibers (NY (MICRO)) are used compared to plain concrete pavement (PLAIN, concrete pavement without fibers) or concrete pavement using microfibers and macrofibers (NY + PVA) In this case, it can be seen that the flexural strength is greater than that of the plain concrete pavement based on the age of 28 days, but the concrete pavement using only macrofibers can be found to be rather disadvantageous in the flexural strength.

In addition, in the case of concrete pavement (NY + PVA) using both microfibers and macrofibers, it can be seen that the tensile strength is greater than that of concrete pavements using only plain concrete and microfibers.

As a result, in order to secure sufficient bending strength in concrete pavement, it is most preferable to use concrete pavement using only microfiber, and concrete pavement using both microfiber and macrofiber is advantageous in terms of securing bending strength. Can be.

Therefore, it can be seen that it is preferable to use a concrete pavement using both microfibers and macrofibers as a method of securing both bending strength and tensile strength.

<Concrete paving method>

Concrete pavement construction method according to the present invention, first, to produce a concrete pavement according to the present invention as described above, Looking briefly,

First, in a concrete pavement including dry beam powder and blended water, the micro fiber and macro fiber are mixed in the volume ratio of 1: 1 to 1: 3 in the dry beam beam powder, wherein the macro fiber is The concrete pavement using the lower limit microfibers and macrofibers is manufactured so that the length is at least 30 mm or more.

At this time, the concrete pavement

Preparing a blended water by mixing water and an air entrainer; And formulating the blended water in a dry beam powder,

The dry beam beam powder is prepared by mixing 180 to 260 parts by weight of sand, 140 to 200 parts by weight of aggregate of 20 mm size, 165 to 230 parts by weight of aggregate of 32 mm size, based on 100 parts by weight of cement,

Based on 100 parts by weight of cement, the blended water is prepared by mixing 99.97 to 99.9995 parts by weight, and the air entrainer 0.005 to 0.03 parts by weight,

The weight ratio of the dry beam beam powder and the blended water is to be 0.4 ~ 0.5,

The microfibers are made of nylon, the macrofibers are made of polyvinyl alcohol, and the volume ratio of the nylon and the polyvinyl alcohol is 1: 1 so as to prepare concrete pavement.

Next, the prepared concrete pavement is brought to the site and laid on the floor, which is then used as it is.

When the concrete pavement compacted in this way is finally cured, the concrete pavement is completed.

1 is a photograph of one example of the microfibers used in the present invention,

2a, 2b, 2c, 2, 2e are photographs of examples of macro fibers used in the present invention,

3 is a graph showing a test example of the bending strength and tensile strength of the macrofiber of the present invention,

4 and 5 are comparative graphs of tensile strength and flexural strength of a concrete pavement using the microfiber and macrofiber according to the present invention.

Claims (8)

In the concrete pavement comprising the dry beam powder and the blended water, The microfibers and the macrofibers are mixed in the volume ratio of 1: 1 to 1: 3 in the dry beam beam powder, but the macrofibers have a length of at least 30 mm or more, The concrete pavement is mixed with water and an air entrainer to produce a blended water; And formulating the blended water in a dry beam powder, The dry beam beam powder is manufactured by mixing 180 to 260 parts by weight of sand, 140 to 200 parts by weight of aggregate of 20 mm, 165 to 230 parts by weight of aggregate of 32 mm, based on 100 parts by weight of cement. , The blending water is 99.97 ~ 99.9995 parts by weight, the air entrainer is prepared by mixing 0.005 ~ 0.03 parts by weight, the weight ratio of the dry beam beam powder and the blending water is 0.4 to 0.5, characterized in that the micro fiber and macro fiber Concrete pavement manufacturing method using. delete The method of claim 1, wherein the microfibers are made of nylon. The method of claim 3, wherein the macro fiber is made of polyvinyl alcohol, and the volume ratio of the nylon and the polyvinyl alcohol is 1: 1. Cement concrete pavement using the microfibers and macrofibers prepared by claim 1. In concrete pavement, In the concrete pavement comprising dry bibimbly powder and blended water, microbial and macrofibers are incorporated in the bibibimbold powder in a volume ratio of 1: 1 to 1: 3, wherein the macrofibers are Preparing concrete pavement using lower limit microfibers and macrofibers so that at least 30 mm or more are used, After laying the concrete pavement on the bottom surface, Concrete pavement construction method using the concrete pavement using the microfiber and macrofiber, characterized in that it comprises the step of curing the compacted concrete pavement. The method of claim 6, wherein the concrete pavement Preparing a blended water by mixing water and an air entrainer; And formulating the blended water in a dry beam powder, The dry beam beam powder is prepared by mixing 180 to 260 parts by weight of sand, 140 to 200 parts by weight of aggregate of 20 mm size, 165 to 230 parts by weight of aggregate of 32 mm size, based on 100 parts by weight of cement, Based on 100 parts by weight of cement, the blended water is prepared by mixing 99.97 to 99.9995 parts by weight, and the air entrainer 0.005 to 0.03 parts by weight, Concrete ratio construction method using a concrete pavement using micro fibers and macro fibers, characterized in that the weight ratio of the dry beam beam powder and the blended water is 0.4 ~ 0.5. 8. The method of claim 7, wherein the microfibers are made of nylon, the macrofibers are made of polyvinyl alcohol, and the volume ratio of the nylon and the polyvinyl alcohol is 1: 1. Concrete pavement construction method using cement concrete pavement.

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