KR100975371B1 - The rapid set reinforcing metal fiber concrete composite and construction method using them - Google Patents

Abstract

The present invention relates to a concrete composition reinforced with steel fibers having properties of durability and strength enhancement and a method for repairing road pavement using the steel fiber reinforced concrete.

The present invention by applying a steel fiber excellent in durability and strength enhancement properties to the packaging, it is easy not only effective thin layer construction, but also has excellent ductility and adhesion to improve strength and durability, and is mixed with aggregate, water, cement, etc. While maintaining and repairing the pavement, the work process and working time can be shortened, while minimizing the pulling or agglomeration of fibers during the tie work (lateral grooving) to increase the friction of the pavement Provided is a super fast-hard steel fiber reinforced concrete composition and packaging repair method using the same that can enhance the rigidity of the package and the structure of the structure supporting the package, or reduce the dead load.

Road, Pavement, Repair, Concrete, Steel Fiber, Carbide

Description

Super fast steel fiber reinforced concrete composition and packaging repair method using the same {The rapid set reinforcing metal fiber concrete composite and construction method using them}

The present invention relates to a super-sized steel fiber reinforced concrete composition and a pavement repair method using the same, and more particularly, to repair road pavement using concrete composition and steel pavement reinforced with steel fibers having characteristics of durability and strength enhancement. It is about how to.

In general, in most Korean cities, construction of excavation of existing roads is inevitable by constructing the urban network first from the road network and expanding the underground facilities such as KEPCO, Chesin, waterworks, city gas, etc. as the population or commerce expands. It is true.

In addition, the excavation work on the main road or the back road continued during the year due to the replacement of old water pipes and the improvement of sewerage system, and the regulations and guidelines for the excavation work were implemented by adjusting the excavation work of each related organization at the same time. However, due to the characteristics of the facilities of each institution, it may be difficult to bury the excavation, and by re-excavating the existing road, citizens' traffic inconvenience, road damage, and economic loss are enormous.

However, such excavation is inevitable due to the expansion of the population and industrialization, but it is necessary to make efforts to minimize civil traffic inconvenience and road disruption by technically rapid and perfect recovery.

In addition, most excavation sites are mainly back alleys, and are scattered, and the excavation width is less than 1m, and most of the excavation widths are accompanied by many problems such as transportation of Ascon and temperature management during the restoration of the excavation site.

In addition, due to civil discomfort, it is the principle to restore the same day, so the backfilling and middle layer construction are done immediately during excavation work.However, the surface layer construction is performed for a certain period of time due to problems such as ascon conveyance, compaction, long term settlement, etc. Since the surface is constructed after sinking by traffic, the 5cm step of the surface thickness prevents the traffic from moving, and causes inconvenience to citizens due to the danger of night traffic and motorcycle accidents.

In addition, the ascon plant is mostly located in the outskirts of the city, and as a result of the congestion of traffic, the Ascon vehicle is delayed for a long time to enter the city, and the Ascon transport vehicle uses a small truck as a small amount, so the temperature of the Ascon drops and is scattered in several places. Ascon moved to the site, the temperature control of Ascon was in the worst condition, and the durability of the excavated road was inferior.

In addition, the small-scale maintenance of asphalt concrete pavement is scattered like small-scale excavation recovery, so assault installation of manpower is inevitable, but there are various problems such as complicated work due to tack coating, ascon laying and compaction, and minimum equipment movement.

In addition, in the case of the sidewalk boundary side, there is a problem that the surface is increased due to water pooling due to settlement or gradient, the surface damage due to the calcium chloride spraying in winter and the re-construction of the road during the overlaid construction of the road, but the conventional repair material has a thin thickness It is difficult to install and has problems such as adhesiveness. Since it is necessary to break concrete into large Breca and install formwork, it must be installed through the process such as ready-mix concrete curing and ascon scouring. Problems have arisen.

In addition, when a crack occurs in a pavement or the like, the asphalt-based suture is repaired by an injection method for the purpose of imparting adhesiveness and waterproofness to the cracked part. However, the conventional repair material is not sufficiently permeable and adhesive. Since it is impossible to penetrate into the minute microcracks, voids, or cracks deep inside the package to be repaired, the problem arises that the strength and durability are insufficient.

In particular, defects and repair traces that the entire encapsulant material filled in the cracks come out as the rainwater is penetrated due to wear and dropping due to vehicle traffic within 1-2 years for the purpose of preventing excellent penetration of the crack periphery. There is a problem that the beauty of the boy remains.

Accordingly, the present invention has been made in view of the above, by applying a steel fiber excellent in durability and strength enhancement properties to the packaging repair, not only effective thin layer construction, but also excellent strength and durability by providing excellent ductility and adhesion It is possible to reduce the work process and working time by mixing with aggregate, water, cement, etc., and to shorten the working process and working time, and to perform the tie work (lateral direction) to increase the friction of the pavement. To provide a super fast-strength steel fiber reinforced concrete composition and packaging repair method using the same to minimize the drag or agglomeration of the fiber during the digging) to enhance the rigidity of the package and the structure supporting the package, or to reduce the dead load. The purpose is.

Ultrasonic carbide steel fiber reinforced concrete composition provided by the present invention to achieve the above object is 16 to 19% by weight cemented carbide, straight steel fiber 4 to 5% by weight, fine aggregates 33 to 39% by weight, coarse aggregate 34 to 35% by weight, It is characterized by consisting of 6 to 7.9% by weight of water, 0.5 to 0.6% by weight of a high performance water reducing agent and a retardant.

Here, the straight steel fiber has a length-to-diameter ratio in the range of 45 to 65: 1, and the coarse aggregate preferably has a maximum dimension of 20 mm.

On the other hand, one example of a pavement repair method using the super fast-tough steel fiber reinforced concrete composition provided by the present invention to achieve the above object is the step of removing the asphalt pavement covered on the concrete slab using a variety of cutting machines, high pressure water Using a blasting equipment to spray water containing sand or other abrasives on the surface of the concrete slab to remove foreign substances and remove foreign substances from the surface, and to mix the ultra-high-speed steel fiber reinforced concrete composition of claim 1 in the mixer at the construction site And then pumped by a pump characterized in that it comprises a construction step of placing a certain thickness on the concrete slab surface.

Here, the construction step is the process of reducing the thickness of the cemented superhard steel fiber reinforced concrete composition of claim 1 less than the thickness of the existing asphalt pavement to reduce the final pavement height than the existing height, and pours the super hard carbide steel fiber reinforced concrete composition of claim 1 After that, the method may further include a process of performing asphalt paving of a predetermined thickness thereon.

On the other hand, another example of a pavement repair method using the super-speed steel fiber reinforced concrete composition provided by the present invention in order to achieve the above object is a step of cutting a predetermined thickness of the existing concrete slab using a variety of cutting machine, the construction site of claim 1 It is characterized in that it comprises a construction step of pouring a super-speed steel fiber reinforced concrete composition in a mixer and then pumped by a pump to a certain thickness on the concrete slab surface.

According to the super fast-rigid steel fiber reinforced concrete composition provided by the present invention and a packaging repair method using the same, the construction can be easily carried out during the packaging repair, it is easy to secure space, can maintain excellent fastness and long-term high strength, emergency construction It can be used to improve the efficiency of field work.

In particular, by using steel fibers having excellent durability and strength enhancement properties for packaging repair, it is possible to minimize the dragging and agglomeration of the fibers during the tie work performed to increase the friction of the packaging, and thus the rigidity and packaging of the package. There is an effect that can increase the rigidity of the structure supporting the sieve and at the same time reduce the dead load.

In addition, by applying cemented carbide at the time of pavement repair, such as road, it is possible to shorten the construction time, it is possible to achieve the rapid opening of traffic.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, the super hard steel fiber reinforced concrete composition is cold-rolled and a mixture of straight steel fibers and super fast cement having a length-to-diameter ratio of 45 to 65: 1, specifically, 16 to 19 wt% of super hard cement, a straight steel fiber 4 ~ 5% by weight, fine aggregate 33-39% by weight, coarse aggregate 34-35% by weight with a maximum dimension of 20mm, 6-7.9% by weight of water, 0.5 ~ 0.6% by weight of a high performance water reducing agent and a retardant.

At this time, the concrete kneading machine, that is, the slump (Slump) value is about 4 ~ 5㎝, the installation during the operation uses a special equipment (Concrete paver).

In addition, the present invention provides a pavement repair method for repairing the damaged portion of the concrete pavement, or replace the asphalt pavement using the concrete having such a composition.

For example, by using a crusher and waterjet to remove the damaged concrete, the composition is poured by mixing the composition using a mixer, and then smoothly finished using a concrete vibratory finisher to use as a pavement surface, or asphalt pavement It can be used for the repair of the bridge deck, and the rigidity and durability improvement by fiber reinforcement can be realized.

Pavement repair method, such as the road provided by the present invention can be implemented in various forms.

That is, in the case of the existing concrete pavement, the concrete pavement is cut to a certain thickness, for example, about 4 to 8 cm or more, and then the method of repairing the pavement of the composition thereon, asphalt pavement if the asphalt pavement on the concrete slab Method of repairing by removing all and paving the composition thereon, wherein at least 2cm of the existing concrete slab from which the asphalt pavement has been removed before placing the composition is cut, and then the composition is poured and used as a pavement surface. The method of reducing the dead weight of the structure by reducing it to a height, another example of the case where the asphalt pavement is put on the concrete slab, all the asphalt pavement removed and cut over (or at least 2cm of the existing concrete slab) ) Pour the composition and put a bird on it The lucky asphalt pavement to provide a method of packaging the final road surface with asphalt.

This will be described in more detail as follows.

As shown in Figure 1, as a construction method for pavement repair, such as a road on which the asphalt 11 is paved on the concrete 10, the first step of removing the asphalt pavement covered on the concrete slab using a variety of cutters To perform.

Next, after removing the asphalt pavement, a foreign material removal step of spraying water containing sand or other abrasives onto the surface of the concrete slab is performed by using a high pressure water blasting equipment to remove surface contamination and fine materials.

Next, after completing the construction preparation process as described above, the construction of the super fast-tough steel fiber reinforced concrete composition (12) of the composition of the present invention at the construction site is mixed in a mixer, and then pumped by a pump to cast a certain thickness on the concrete slab surface Performing the steps will complete the pavement repair work on the road (see Figure (B)).

At this time, in order to reduce the dead load, in the construction step by lowering the thickness of the cemented superhard steel fiber reinforced concrete composition of the present invention than the thickness of the existing asphalt pavement, the final pavement height after construction is reduced than the existing height, eventually the structure of the structure The dead load can be reduced (see Figure (C)).

In addition, in order to increase the rigidity and the continuity of the pavement, in the construction step, after pouring the super fast-grown steel fiber reinforced concrete composition of the present invention, it can be constructed by a method of carrying out the asphalt pavement of a certain thickness thereon. See D))

In addition, in the case of the pavement repair method of the road consisting of only concrete slab, the step of cutting the existing concrete slab to a thickness of about 4 ~ 8cm using a variety of cutters, and then the super-speed steel fiber of the present invention in the construction site After reinforcing concrete composition is mixed in the mixer, it is pumped and pumped to a certain thickness, for example, the thickness of the concrete slab, which is cut into concrete slab. This is done (see Figure (A)).

On the other hand, in the case of a composition in which steel fibers are mixed, it is necessary to prevent agglomeration of the fibers in the interior, and to determine the appropriate fiber incorporation ratio and the length-to-diameter ratio of the fibers in order to prevent cracking as well as increase rigidity.

In addition, due to the use of cemented carbide cement, the amount of water-reducing agent and coagulation retardant considering the efficiency of tying and finishing work should be properly defined.

To this end, in the present invention, the steel fiber incorporation rate was determined as follows.

Steel fiber mixing ratio is an important factor for increasing the toughness and stiffness as well as reducing the cracks, and in order to repair the package to be achieved by the present invention, an appropriate steel fiber mixing ratio was set in consideration of the maximum size and the repair thickness of the coarse aggregate.

As shown in Figure 2, to determine the steel fiber incorporation rate, the appropriate incorporation rate was determined by the following Examples 1, 2, 3 and other finish tests, Examples 1, 2, 3 using a 10x10x40cm bending mold test body The stiffness according to the fiber mixing rate was tested. When the fiber mixing rate was 4 to 5% by weight, the workability and stiffness-improving effect were excellent, and the workability was disadvantageous due to the aggregation of the fiber at 5% by weight or more.

Example 1

Ultra fast cemented carbide reinforced concrete composition was used as a super fast cement 16.9% by weight, water 6.9% by weight, fine aggregate 35.9% by weight, coarse aggregate 35% by weight, steel fiber 5.2% by weight, water reducing agent and retardant 0.1% by weight. The steel fiber incorporation rate is 1.6% by volume.

Example 2

The super hard steel fiber reinforced concrete composition was used 17.1% by weight cemented carbide cement, 7.0% by weight water, fine aggregate 36.2% by weight, coarse aggregate 35.4% by weight, steel fiber 4.2% by weight, reducing agent and retardant 0.1% by weight. The steel fiber incorporation rate is 1.3% by volume.

Example 3

The cemented carbide steel fiber reinforced concrete composition was used as the cemented carbide cement composition 17.3% by weight, water 7.1% by weight, fine aggregate 36.8% by weight, coarse aggregate 36.0% by weight, steel fiber 2.7% by weight, water reducing agent and retardant 0.1% by weight. The steel fiber incorporation rate is 0.8% by volume.

In the present invention, the steel fiber shape was determined as follows.

When the length of the steel fiber is longer, the bending stress improvement effect is greater than that of the shorter steel fiber even at a small mixing ratio, and is also shown in the result graphs of Examples 4, 5, 6, and 7.

The ratio of diameter to length, which is important in the selection of steel fibers, was determined through Examples 4, 5, 6 and 7.

As shown in FIG. 3, the test results using steel fibers having different diameter-to-length ratios showed similar stress trends even when the steel fiber mixing ratio was different, but the present invention considers the maximum dimension of the thick aggregate in consideration of the repair thickness. Since it is limited to 20mm, the actual packing minimum thickness will be 40mm, which is twice the aggregate. Therefore, the 60mm long steel fibers of Examples 6 and 7 are difficult to use, and in the case of Example 4, the final shape of the package is a steel fiber having an annular shape. When grooving, cotton had a lot of effects of dragging, which made it difficult to use as a package.

Therefore, it is most preferable to use a 20 mm long product with straight steel fibers in the ratio of diameter to length in the range of 1:45 to 65.

Example 4

The super hard steel fiber reinforced concrete composition was used 17.1% by weight cemented carbide cement, 7.0% by weight water, fine aggregate 36.2% by weight, coarse aggregate 35.4% by weight, steel fiber 4.2% by weight, reducing agent and retardant 0.1% by weight. The steel fiber incorporation rate is 1.3% by volume. The diameter-to-length ratio of the incorporated steel fibers is 1:43, and the shape is annular, 0.7 mm in diameter and 30 mm in length.

Example 5

The super hard steel fiber reinforced concrete composition was used 17.1% by weight cemented carbide cement, 7.0% by weight water, fine aggregate 36.2% by weight, coarse aggregate 35.4% by weight, steel fiber 4.2% by weight, reducing agent and retardant 0.1% by weight. The steel fiber incorporation rate is 1.3% by volume. The diameter-to-length ratio of the mixed steel fibers is 1:50, and the shape is straight and 0.6 mm in diameter and 30 mm in length.

Example 6

The cemented carbide steel fiber reinforced concrete composition was used 17.4% by weight cemented carbide, 7.1% by weight water, 36.9% by weight aggregate, 36.0% by weight coarse aggregate, 2.5% by weight steel fiber, 0.1% by weight of water reducing agent and retardant. The steel fiber incorporation rate is 0.8% by volume. The diameter-to-length ratio of the incorporated steel fibers is 1:65, and the shape is annular, 0.9 mm in diameter and 60 mm in length.

Example 7

The cemented carbide steel fiber reinforced concrete composition was used 17.4% by weight cemented carbide, 7.1% by weight water, 36.9% by weight aggregate, 36.0% by weight coarse aggregate, 2.5% by weight steel fiber, 0.1% by weight of water reducing agent and retardant. The steel fiber incorporation rate is 0.8% by volume. The diameter-to-length ratio of the incorporated steel fibers is 1:75, and the shape is annular, 0.8 mm in diameter and 60 mm in length.

Compared with the super fast carbide steel fiber reinforced concrete of the present invention as described above and the common super hard concrete.

As shown in Figure 4 and 5, comparing the strength of the cemented carbide concrete repair material mainly used in the existing concrete repair method and the present invention, the composition of the present invention is relatively compressed compared to the conventional cemented carbide concrete High strength and flexural rigidity

In addition, the slump value range of 4 ~ 5cm, easy to work by the concrete vibratory finisher, and designed to be applied to the superelevation slope of the road considering the drainage.

Example 8

The cemented carbide steel fiber reinforced concrete composition was used as cemented carbide cement 17.1% by weight, water 7.1% by weight, fine aggregate 33.5% by weight, coarse aggregate 38.0% by weight, steel fiber 4.2% by weight, reducing agent and retardant 0.1% by weight.

The water cement ratio was 41% and the slump was 5 cm.

The steel fiber incorporation rate used is 1.3% by volume and the ratio of diameter to length is 1:50.

Example 9

The cemented carbide steel fiber reinforced concrete composition was used as 17.7% by weight cemented carbide cement, 7.0% by weight water, 32.9% by weight fine aggregate, 37.4% by weight coarse aggregate, 4.9% by weight steel fiber, 0.1% by weight reducing agent and retarder.

The water cement ratio was 41% and the slump was 5 cm.

The steel fiber incorporation rate used is 1.3% by volume and the ratio of diameter to length is 1:50.

Comparative Example 1

The cemented carbide steel fiber reinforced concrete composition was used as 17.7% by weight cemented carbide cement, 6.7% by weight water, 36.7% by weight fine aggregate, 38.8% by weight coarse aggregate, 0.1% by weight reducing agent and retardant.

The water cement ratio was 41% and the slump was 5 cm.

The steel fiber incorporation rate used is 1.3% by volume and the ratio of diameter to length is 50.

As described above, the pavement repair method such as the road using the super fast diameter steel fiber reinforced concrete composition provided by the present invention can realize the inside of the fiber agglomeration prevention, crack suppression, increase the rigidity, etc., suitable for emergency construction of the road, In particular, it is possible to eliminate the drag and agglomeration of fibers during the tying operation, and ultimately to shorten the construction time, thereby improving the speed of opening the traffic.

Figure 6 shows a number of embodiments of the steel fiber, as shown can be implemented in a variety of shapes, such as a straight, as well as deformed both ends of the ring, bent.

Figure 1 is a schematic view showing several embodiments of a packaging repair method using a super fast-grown steel fiber reinforced concrete composition according to the present invention

Figure 2 is a graph showing various embodiments of the relationship between the bending load and strain of the super hard diameter steel fiber reinforced concrete composition according to the present invention

Figure 3 is a graph showing various embodiments of the relationship between the bending stress and strain of the super hard diameter steel fiber reinforced concrete composition according to the present invention

Figure 4 is a graph comparing the compressive strength of the cemented carbide steel fiber reinforced concrete composition according to the present invention

Figure 5 is a graph comparing the flexural strength of the super hard diameter steel fiber reinforced concrete composition according to the present invention

<Description of the symbols for the main parts of the drawings>

10: concrete 11: asphalt

12: Ultra-fast diameter steel fiber reinforced concrete composition

Claims (8)

16 to 19 wt% cemented carbide, 4 to 5 wt% straight steel fiber, 33 to 39 wt% fine aggregate, 34 to 35 wt% coarse aggregate, 6 to 7.9 wt% water, 0.5 to 0.6 wt% high performance water reducer and retardant Ultrasonic mirror steel fiber reinforced concrete composition, characterized in that made. The method of claim 1, wherein the straight steel fiber, super fast diameter steel fiber reinforced concrete composition, characterized in that the length to diameter ratio in the range of 45 ~ 65: 1. The method of claim 1 or 2, wherein the coarse aggregate is super fast-grown steel fiber reinforced concrete composition, characterized in that the maximum dimension 20mm. The method of claim 1, wherein the slump value of the super fast-grown steel fiber reinforced concrete composition is characterized in that the super fast-grown steel fiber reinforced concrete composition. Remove the asphalt pavement covered on the concrete slab by using various cutting machines, and by using a high pressure water blasting equipment to spray water containing sand or other abrasives on the concrete slab surface to remove the surface contamination and fine material Ultrasonic diameter steel fiber reinforced concrete, characterized in that it comprises a step of removing foreign matter, and the construction of the super fast diameter steel fiber reinforced concrete composition of claim 1 in the construction site and then pumped by a pump to cast a certain thickness on the surface of the concrete slab Packaging repair method using the composition. The method of claim 5, wherein the construction step of the super hard steel fiber reinforced concrete composition of claim 1 by lowering the thickness of the existing asphalt pavement, the final pavement height superfine steel fiber characterized in that it comprises a process of reducing the height of the existing pavement Packaging repair method using reinforcement concrete composition. The method of claim 5 or claim 6, wherein the construction step, after pouring the super-hard carbon steel reinforced concrete composition of claim 1, the super fast-grown steel fiber reinforced concrete composition comprising the step of performing a paving asphalt of a certain thickness thereon Packaging repair method using. Cutting the existing concrete slab to a certain thickness by using various cutting machines, and the construction step of mixing the ultra-high-speed steel fiber reinforced concrete composition of claim 1 in the mixer at the construction site and pumping it with a pump to cast a certain thickness on the concrete slab surface Packaging repair method using a super fast-grown steel fiber reinforced concrete composition comprising a.

Images