KR20100050866A - Repair method for concrete pavement - Google Patents

Abstract

PURPOSE: A repairing method of concrete pavement package is provided to prevent damage to normal concrete and efficiently remove damaged concrete. CONSTITUTION: A repairing method of concrete pavement package comprises following steps. A damaged concrete part is cut at spray pressure of 1000~3000 bar and quantity per unit time of 20~300l/min to form impact quantity of 500~1500Ns through a high pressure spray device. Repair concrete is poured on the surface of the concrete of which the damaged part is cut.

Description

REPAIR METHOD FOR CONCRETE PAVEMENT}

The present invention relates to the field of civil engineering, and more particularly, to a repair method for bridge pavement and other road pavement of a bridge.

In order to repair damaged sections of bridge pavement or road pavement of bridges made of concrete, first, a process of removing the deteriorated concrete and installing a repair material thereon is necessary.

Here, the method of removing the deteriorated concrete includes a method using a portable breaker, a method using a road crusher, a method using a high pressure water jet device (water jet), and the like.

Among these, the shredding method by the high-pressure water injection device can remove only the deterioration part of the concrete by controlling the water pressure, minimize the damage to the healthy part, and does not require an additional step after the shredding.

By the way, it has been pointed out as a problem that the concrete structure regarding the intensity | strength with which intensity | strength is injected in performing the crushing method by the high pressure water injector conventionally has been proposed.

If the strength of the high-pressure water is too weak, the deteriorated concrete is not removed properly, so even if the concrete for repair is placed on it, the required adhesion strength cannot be obtained. On the contrary, if the strength is too strong, waste will occur as the concrete is crushed. This is because the strength of existing concrete roads can be reduced.

The present invention is derived to solve the above problems, by presenting a specific configuration, such as the injection pressure of the high-pressure water injection device, the quantity per unit time, it is possible to efficiently remove only the deteriorated concrete while preventing damage to sound concrete The purpose of this project is to propose a repair method for concrete pavement.

In order to achieve the object as described above, the present invention, in the repair method of concrete road pavement with a strength of 15 ~ 40MPa, spraying 1000 ~ 3000 bar, so that the impact amount of 500 ~ 1500N · s by a high-pressure water injection device A concrete damage part cutting step of cutting the concrete damage part with a pressure and a quantity per unit time of 20 to 300 l / min; It proposes a repair method of concrete road pavement including; concrete repair step of pouring the repairing concrete on the surface of the damaged concrete cutting portion.

It is preferable that the impact amount by the high pressure water injector in the concrete damaged part cutting step is 800 to 1200 N · s.

One point crushing time of the high-pressure water injection device is preferably 0.3 ~ 1 sec.

The injection force of the high pressure water injection device is preferably 800 ~ 2400N.

In the cutting step of the concrete damaged part, the higher the degree of damage of the concrete damaged part, it is preferable that the injection pressure of the high-pressure water injector is weak, instead of adjusting the amount per unit time is large.

In the concrete damaged portion cutting step, when the strength of the concrete is 15 ~ 24MPa, it is preferable to cut the concrete damaged portion by the injection pressure of 1000 ~ 1500 bar, the quantity per unit time of 150 ~ 300ℓ / min by the high-pressure water injection device Do.

In the concrete damaged portion cutting step, when the strength of the concrete is 24 ~ 40MPa, it is preferable to cut the concrete damaged portion by the injection pressure of 2000 ~ 3000 bar, the quantity per unit time of 20 ~ 100l / min by the high-pressure water spraying device Do.

The repairing concrete is preferably latex modified concrete.

The repairing concrete is preferably superhard latex modified concrete.

The present invention proposes a concrete road pavement repairing method to efficiently remove only deteriorated concrete while preventing damage to sound concrete by presenting a specific configuration such as the injection pressure of the high-pressure water injection device and the quantity per unit time.

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

The present invention basically relates to a repair method for concrete road pavement with a strength of 15 to 40 MPa, and has a spray pressure of 1000 to 3000 bar and 20 to 300 l / min so that an impact amount of 500 to 1500 N · s is achieved by a high pressure water spray device. Concrete damaged portion cutting step of cutting the concrete damaged portion per unit time of; It is configured to include; repairing concrete pouring step of placing the repairing concrete on the surface of the damaged concrete cutting.

The reason that the damaged part of the concrete is cut by the high pressure water is because the high pressure water is applied to the concrete, and even if the same force is applied, the degree of fracture of the concrete varies depending on how long it is applied.

In other words, the degree of crushing of concrete by the high pressure water is proportional to the injection force (force) of the high pressure water applied per unit time, that is, the amount of impact (N · s).

In addition, the product of the injection pressure (P: bar) of the high pressure water and the quantity per unit time (Q: ℓ / min) is proportional to the injection force (N) of the high pressure water injector. Accuracy can be controlled by three factors: injection pressure of high pressure water, quantity per unit time, and injection time for one point.

Here, the injection time for one point, as shown in Figure 1, when the nozzle (1) of the high-pressure water injector moves on the surface (2) of the concrete pavement to be repaired while injecting high pressure water, The distance divided by the moving speed.

If these relationships are expressed by mathematical equations, they are as follows.

V (m / sec) = √P (bar) × 13.73

R (N) = V (m / sec) × Q (ℓ / min) × 0.017

     = √P (bar) × Q (ℓ / min) × 0.23341

I (Ns) = R (N) × S (sec)

Since water is an incompressible fluid and has a density of 1, the above results can be obtained by converting volume and mass to each other on the basis of 1L = 1000cc = 1000g.

The present invention is based on this principle, based on the test results by limiting the amount of impact applied to the concrete by the high-pressure water injection device to a certain range, it is possible to efficiently remove only the deteriorated concrete while preventing damage to sound concrete I would have to.

Hereinafter, the content of the experiment on which the numerical limitation is based will be described.

Table 1 shows the examples and comparative examples of the present invention, the injection pressure (P) of the high-pressure water ranges from 1000 to 2500 bar, the quantity per unit time (Q) is in the range of 82 ~ 268 (L / min), The time was varied in the range of 0.51 ~ 0.94 sec.

In this case, the impact amount varies in the range of 310 to 1797 (N · s).

In the road pavement repairing method of the present invention, the performance of the repaired structure is determined by the adhesion strength between the existing concrete and the overlaid repairing material, and a method for evaluating the attachment strength is as follows. Test method, split tensile strength test, flexural tensile test, direct pull bond strength test, etc.

In this experiment, direct pull adhesion strength test method was used. As shown in FIG. 1, the old and new concretes were separated by cutting the core into the core and drawing the core in the axial direction. It is a method of measuring the adhesion strength between.

The experiment was conducted according to ACI 503R-93 and ICRI Technical Guideline No. 03739.

Specifically, the concrete pavement section of the Toll Gate closed plaza (former) Dongsuwon Toll Gate located in the direction of Gangneung, Yeongdong Expressway was cut with different cutting methods as in the above examples and comparative examples, and then overlaid with VES-LMC. A pullout adhesion test was performed.

Tensile strengths were measured at 14 and 28 days by age for each of the sections repaired by the above examples and comparative examples, and the results are as follows.

Direct drawing tensile strength of the concrete pavement to be repaired structure is 1.54 ~ 2.00MPa, the embodiment according to the present invention was measured to be 0.94 ~ 1.50MPa in the case of Comparative Examples 1 and 2, while showing similar strengths. .

That is, in the case of the repair section to which the embodiment according to the present invention is applied, since the strength is almost the same as that of the original pavement, it means that the new concrete is completely attached.

On the other hand, the comparative examples show a small value compared to the strength of the original pavement, which means that the amount of impact due to high pressure water is so small that deteriorated concrete is not properly removed or, on the contrary, the amount of impact is so large that it is crushed to sound concrete and is sufficiently attached. It is because it does not exert strength.

The concrete cutting process is performed by a high pressure water injector. In view of the workability and the actual performance of the equipment, the one-point crushing time of the high pressure water injector is appropriately in the range of 0.3 to 1 sec. The injection force of the device was found to be in the range of 800 to 2400 N.

As described above, the degree of crushing of concrete by the high pressure water can be controlled by three factors such as the injection pressure of the high pressure water, the quantity per unit time, and the injection time for one point. Instead of a weak injection pressure of the injector, it was found that it is desirable to adjust the quantity per unit time to be large.

This is because excessive damage of the pavement may be caused when high pressure water with too high injection pressure is applied to concrete having a high degree of damage.

Specifically, when the damage degree of the concrete damaged part is high (concrete strength is 15 to 24 MPa), the concrete is discharged at a pressure of 1000 to 1500 bar and a quantity per unit time of 150 to 300 l / min by a high pressure water spray device. It is desirable to cut the damaged portion.

On the contrary, when the damage degree of the concrete damage part is low (when the strength of the concrete is 24 to 40 MPa), the concrete damage part is discharged by a high pressure water spray device at a spray pressure of 2000 to 3000 bar and a quantity per unit time of 20 to 100 l / min. It is desirable to cut.

Hereinafter, the experimental results of applying the repair method according to the present invention with different materials of concrete will be described.

Table 2 is the contents of Examples 1 and 2 and Comparative Examples 1 and 2 of the concrete material applied to the repair method of the present invention, Table 3 shows a specific compounding table.

As shown in Table 4, it can be seen that the compressive strength itself is not significantly different in Examples 1 and 2 and Comparative Examples 1 and 2, but in Examples 1 and 2 in terms of adhesion strength, It can be seen that it is much superior to.

That is, the repair method according to the present invention may be applied even when using general concrete as a repair material, but when latex modified concrete is used, it has been found to have more excellent adhesive strength, and to modify the ultra-fast latex for rapid traffic opening. In the case of using concrete, it has been shown to have a very good adhesion strength.

Since the above has been described only with respect to some of the preferred embodiments that can be implemented by the present invention, the scope of the present invention, as is well known, should not be construed as limited to the above embodiments, the present invention described above It will be said that both the technical idea and the technical idea which together with the base are included in the scope of the present invention.

1 is a block diagram of the concrete damaged portion cutting step of the repair method according to the present invention.

Figure 2 is a schematic diagram of the direct pull adhesion strength test.

** Description of the symbols for the main parts of the drawings **

1: Nozzle of high pressure water injector 2: Surface of damaged concrete

Claims (9)

In the repairing method of concrete road pavement with strength of 15 ~ 40MPa, A concrete damage part cutting step of cutting the concrete damage part at an injection pressure of 1000 to 3000 bar and a quantity per unit time of 20 to 300 l / min so that the impact amount is 500 to 1500 N · s by the high pressure water injection device; A repair concrete placing step of pouring concrete for repairing the damaged concrete surface; Repairing method of concrete pavement to include. The method of claim 1, In the concrete damaged part cutting step The repairing method of concrete road pavement, characterized in that the impact amount by the high-pressure water injection device is 800 ~ 1200N · s. The method of claim 2, One point crushing time of the high-pressure water injection device repair method of concrete road pavement, characterized in that 0.3 ~ 1 sec. The method of claim 3, The spraying force of the high pressure water injector is repairing method of concrete road pavement, characterized in that 800 ~ 2400N. The method of claim 4, wherein The concrete damaged part cutting step The higher the damage degree of the concrete damaged part, the weaker the injection pressure of the high-pressure water injection device, the repair method of concrete road pavement, characterized in that to adjust the quantity per unit time is large. The method of claim 5, The concrete damaged part cutting step When the strength of the concrete is 15 ~ 24MPa, repair the concrete road pavement, characterized by cutting the concrete damaged part by the injection pressure of 1000 ~ 1500 bar, the quantity per unit time of 150 ~ 300ℓ / min by the high-pressure water injection device Method. The method of claim 5, The concrete damaged part cutting step When the strength of the concrete is 24 ~ 40MPa, the repair of concrete road pavement, characterized by cutting the concrete damaged part by the injection pressure of 2000 ~ 3000 bar, the quantity per unit time of 20 ~ 100l / min by the high-pressure water injection device Method. The method according to any one of claims 1 to 7, The repairing concrete repair method of concrete road pavement, characterized in that the latex modified concrete. The method of claim 8, The repairing concrete repair method of concrete road pavement, characterized in that the super-speed latex modified concrete.

Images