JP2608101B2 - Repair method for concrete or mortar floor - Google Patents

Description

The present invention relates to concrete or mortar floors in factories, warehouses, gas stations, and the like, and includes damages such as generation of dynamic cracks, pause cracks, fine cracks, and dust. The present invention relates to a new repair method capable of repairing a severely damaged floor very quickly.

(Conventional technology) Conventionally, as a method of repairing the floor, a method of pouring and finishing finished concrete after the entire concrete layer has been cut.

Quick-hardening cement concrete or mortar or a method of adding concrete or mortar to a concrete or mortar by adding a quick-strength agent or quick-setting agent.

V-cut sealing is used to finish concrete cracks.

Finishing method with polymer cement mortar.

A method of finishing with a reactive synthetic resin (eg, epoxy resin, acrylic resin, etc.).

Etc. had been adopted.

(Problems to be Solved by the Invention) By the way, the above-mentioned facilities are often operated almost without holidays due to their nature, and therefore cannot be stopped for a long time to repair the floor. Often there is. From such a viewpoint, the above-mentioned repair method has a problem that it takes time for the filing work and the replacement of the reinforcing bar, and the construction period is 3 to 4 weeks. The repair method of (1) has the disadvantage that the material is expensive and beautiful finishing is difficult, and the strength of the early-strength cement is slow and the hardening of the jet cement is fast, but the strength is brittle. In addition, the hardening is forcibly accelerated by the use of an early-strength agent or a quick-setting agent, and the rapid heat generation of the hydrate further promotes the setting and hardening. As a result, the center of each particle remains unreacted. However, since it becomes brittle as a whole, it can be used only on floors where strength is not required. The repair method described in No. 1 does not cause any problem if the crack is small, but has a problem that the crack width is large and the synthesis of the slab is reduced, or in the case of a dynamic crack, the crack is generated again in a few months. Repair method does not provide satisfactory performance in terms of crack resistance, abrasion resistance, adhesion to the substrate, flexibility, etc. and does not satisfy the flame retardant second class, so gasoline regulated by the Fire Service Law It could not be used on the floor of the stand. Is very suitable for repairing floors in food factories because of its excellent chemical resistance, but it is expensive and cannot repair wet floors. Can not be used to repair the floor of gas stations.

The present invention has been made in view of the above, and is intended to provide a novel concrete or mortar floor repair method which is extremely simple in construction, can be used again in a short time, and has sufficient strength. is there.

(Means for Solving the Problems) A method of the present invention for achieving the above object is a method for repairing a repaired floor surface having a crack or the like, and the metal net is formed so as to straddle the crack along the crack. After fixing, an underwater-curable epoxy resin primer is applied, and cement: sand: water: synthetic resin = 1:
The gist of the invention is to paint and finish a resin mortar having a compounding ratio of 0.5 to 2: 0.3 to 0.5: 0.05 to 0.4 (weight ratio, the same applies hereinafter).

The synthetic resin blended in the resin mortar includes a synthetic resin emulsion, more specifically, ethylene vinegar (EV)
A), acrylic (AC), styrene butadiene rubber (SB
A synthetic resin emulsion which is stable to cement alkali such as R) is desirably employed.

Further, when reinforcing fibers are added to the finishing resin mortar, it is effective to increase the strength of the finishing layer. However, glass fibers, synthetic resin fibers, carbon fibers, iron fibers, and the like can be used as the reinforcing fibers. is there. Of these, alkali-resistant glass fibers are the most excellent in terms of handleability, reinforcing effect and the like, and are preferably employed.

Further, the proper blending of the finishing resin mortar is as described above, and the basis thereof will be described below.

That is, when the sand is less than 0.5 with respect to the cement 1, the strength of the finished layer is not sufficiently exhibited, and when it exceeds 2, the required moisture increases and the brittleness tends to be brittle. When the water content is less than 0.3, the workability is poor and the finish is not good, and when the water content exceeds 0.5, it takes a very long time to cure and the strength is reduced. Further, when the synthetic resin is less than 0.05, the adhesive strength with the primer layer becomes weak, and when it exceeds 0.4, the resin becomes rich and becomes soft, the water resistance is reduced, and the flame retardant does not satisfy the second class standard. A point occurs.

As described above, the reinforcing fibers are effective in increasing the strength, and the amount of the reinforcing fibers is preferably 0.01 to 0.1 with respect to 1 cement. If it is less than 0.01, the reinforcing effect is not sufficient and no effect is exerted on the crack resistance, and if it exceeds 0.1, mortar construction becomes impossible.

When there is a crack or the like on the floor to be repaired, a metal net is used. As the net, a lath net, a welded net, an expanded metal, or the like is desirably used.

(Action) In the floor repair method having the above-described configuration, the floor surface to be repaired is degreased in advance. The metal net is fixed along the cracks on the repaired floor surface and across the cracks with anchor bolts or chemical anchors, and then the underwater-curable epoxy resin primer is applied to the repaired floor surface with a roller or a rubber iron. Te was coated to a 300 to 500 g / m ^2, coated with a thickness of 5~2mm resin mortar presented separately finish the primer coating layer on the surface the primer so as to fill a metal net assembly in the uncured state To finish. As described above, when a metal net was used when there was a crack, a primer and a resin mortar for finishing were directly applied without any treatment to the crack portion, and the material was used for a young age (24 to 48 hours). When a heavy object with a resistance greater than the crack resistance moment travels, the load concentrates on these cracks, causing small cracks in the mortar layer directly above them, and these small cracks grow over time and are repaired. This is because it may reach the surface. That is, since the metal net is fixed integrally across the cracks, the concentration of the load is avoided, and the resin mortar layer forms a dense structure without cracks or the like. If the crack is deep or large, it is preferable to fill the cement paste in advance and lay a metal net on it. Thus, after curing and curing the resin mortar layer by allowing it to stand naturally for 6 to 48 hours, the resin and the primer in the mortar layer are firmly integrated with the floor to be repaired, including the metal net, and In addition, the sand as the aggregate dispersed in the mortar layer and the cement and resin as the binder form a matrix-like united structure, thereby forming a structure capable of running heavy objects in a short time after construction.

Furthermore, if the above-mentioned reinforcing fibers are added to the resin mortar, the reinforcing fibers are entangled in the layer to be integrally joined, and the strength is further increased.

(Example) Next, an Example is described.

Thoroughly degreasing the floor of the gas station where hair cracks are occurring, remove the XS-31 expanded metal by 10
It was cut to a width of 3030 cm, placed side by side along the crack and straddling the crack, and fixed on both sides with anchor bolts. On the surface, a water-curable epoxy resin [Sumitomo Chemical Co., Ltd., main agent Sumiepoxy ELA-115, curing agent Sumicur ML-2] is applied with a roller to 400 g / m ^2, and the applied primer is applied. In the uncured state (at least while there was a finger tack), a finishing resin mortar having the following composition was applied to a thickness of 10 mm so as to fill the expanded metal, and the document was iron-finished while spraying water.

The floor repaired as described above takes about 6 hours in summer (25 ° C or higher) and about 6 hours in spring and autumn (15 ° C).
After 18 hours, and in the winter (around 5 ° C), the compressive strength reached 100 kg / cm ² after about 42 hours, making it possible to run a car, truck or forklift. Moreover, after 28 days aging, the compressive strength 350~400kg / cm ^2, bending strength 170 to 180
kg / cm ² , and no cracks occurred on the surface.

The resin content in the repair floor structure according to the above embodiment is 6%.
Since it is as follows, it is sufficiently suitable for the second grade of flame retardant and is particularly effective in repairing floors of gas stations, but it is needless to say that it can also be applied to floor repairs in food factories, textile factories or machinery factories. .

(Effect of the Invention) As described above, on the repair floor according to the method of the present invention, the primer and the resin mortar layer are firmly integrated, and the resin mortar layer is integrated with cement, resin and aggregate. Thus, a more robust structure is formed, which can sufficiently withstand the running of heavy objects. Also, the finishing resin mortar is a so-called rich blend,
In addition, since the epoxy primer is coated and finished in an uncured state, there is no fear of peeling or cracking due to shrinkage due to simultaneous curing of the two, so that it can be used in an extremely short time after application. Further, it is sufficient to treat the base with a degree of degreasing, and it is possible to apply even if the base is wet due to the characteristics of the underwater effect type epoxy resin primer. Such characteristics are extremely useful for establishments such as gas stations and food factories that cannot stop operation for a long time. In addition, cracks may be formed in the resin mortar layer by cracking by applying a primer and finishing resin mortar after installing a metal mesh body in advance for cracks etc. on the repaired floor surface Without
As described above, a structure having extremely high rigidity can be obtained.

In addition, if reinforcing fibers such as glass fibers are added to the resin mortar, the strength of the finished layer is further increased, and the suitability for the above use is further increased.

As described above, the present invention in which a remarkable effect can be obtained is very large.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-83758 (JP, A) JP-A-52-66520 (JP, A)

Claims (3)

(57) [Claims] Claims: 1. A metal net is fixed along a crack on the surface of a repaired floor of concrete or mortar having a crack so as to straddle the crack, and then a water-curable epoxy resin primer is applied. Cement: sand: water: synthetic resin = 1: 0.5 to 2: 0.3 with the primer uncured
A method of repairing concrete or mortar floors, characterized by painting and finishing with a resin mortar having a mixing ratio of 0.5 to 0.05 to 0.4 (weight ratio). 2. The repair method according to claim 1, wherein the resin mortar further contains 0.01 to 0.1 (weight ratio) of the reinforcing fiber relative to 1 cement. 3. The repair method according to claim 2, wherein said reinforcing fibers are alkali-resistant glass fibers.