Method for repairing cement road

Abstract

The invention relates to a method for repairing a cement road, which comprises the following steps of: 1, washing mud on the surface of the cement road to be repaired by using high-pressure water, and strictly prohibiting washing with water and preventing the mud from permeating into a foundation at the position where expansion joints and pouring seams are lost; 2, wiping oil stains on the surface of the cement road by using a steel wire brush to remove the oil stains on the surface; 3, the cleaned mud is washed away through high-pressure water; 4, scabbling the surface of the cement road after the road surface is dried; 5, chiseled disintegrating slag is removed, and a roller is used for brushing an adhesion agent; 6, after the interface agent is air-dried for 1-3 hours, pouring epoxy resin and curing agent quick repair mortar with the ratio of 2: 1; 7, after self-leveling, hydraulic engineering flattening is carried out on local uneven places; and 8, maintaining for 3 days to enable the road to pass. The problem of slab staggering of cement road plates can be solved in time, project investment is reduced, the construction period is shortened, and the disadvantage of passage obstacles of an original road is greatly reduced.

Description

Technical Field

[0001] The invention relates to the field of roadbed engineering construction, in particular to a method for repairing a cement road. Background Art

[0002] Cement roads are quite common inside factories. Cement roads are usually equipped with expansion joints. There are many heavy vehicles in the factory area. Cement roads are subjected to long-term crushing by heavy vehicles. Different degrees of settlement and dislocation will occur between road slabs, resulting in uneven roads. In serious places, the height difference of dislocation can reach 3 to 5 cm, which seriously affects the comfort of road traffic. At the same time, there are great safety hazards in pedestrian walkways. Electric bicycles are prone to slip when passing through, which also affects the image of the factory area.

[0003] Traditional repair methods mainly involve directly laying an asphalt concrete layer, but this method has a series of significant problems. First, directly covering the new asphalt concrete fails to effectively solve the basic problems of the original road surface, and often just "covers" the problem rather than solving it. The mismatch between the new and old pavements will lead to stress concentration and accelerate the formation of cracks, which greatly reduces the service life of the repaired pavement and poses a challenge to the continued availability of the road.

[0004] However, if the entire original road is demolished and re-poured, it will not only require a large investment and a long construction period, but will also seriously affect the normal traffic on the road. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for repairing cement roads, which solves the technical problems in the prior art such as easy peeling of the repair layer, insufficient durability, long construction period and high investment cost through differentiated pretreatment, composite interface agent reinforcement and rapid self-leveling repair process.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a cement road repair method, which is mainly aimed at repairing the misalignment between plates caused by settlement and with expansion joints. The specific process route is as follows:

[0007] 1. Use high-pressure water to wash away the mud on the surface of the cement road to be repaired. It is strictly forbidden to use water to wash where the expansion joints are missing to prevent them from seeping into the foundation;

[0008] 2. Use a wire brush to clean the surface oil on the cement road to remove the surface oil;

[0009] 3. Use high-pressure water to flush away the removed mud;

[0010] 4. After the road surface is dry, roughen the surface of the cement road;

[0011] 5. Remove the debris from the chiseling and apply the interface agent with a roller;

[0012] 6. After the interface agent has dried for 1-3 hours, pour the quick repair mortar with a ratio of 2:1 epoxy resin and curing agent;

[0013] 7. After self-leveling, hydraulic leveling is carried out on the uneven areas; 8. After 3 days of maintenance, the road can be opened to traffic.

[0014] Furthermore, in step S1 of the present invention, the area where the expansion joint caulking material is missing is temporarily sealed with a fast-setting polyurethane foam, and the sealing process continues until before the rapid repair construction.

[0015] Furthermore, in step S1 of the present invention, the pressure range of high-pressure water washing is 15-25 MPa, and the washing angle is 45-60° inclined washing; the chiseling treatment adopts mechanical chiseling equipment, and the chiseling density is 20-30 pieces / cm 2 The dents should be chiseled to a depth of 3-5mm.

[0016] Furthermore, in step S2 of the present invention, the amount of the interface agent applied is 0.3-0.5 kg / m 2 The air-drying time is dynamically adjusted according to the ambient humidity: air-dry for 1 hour when the humidity is ≤60%, and extend to 3 hours when the humidity is >60%.

[0017] Furthermore, in step S3 of the present invention, the epoxy resin is bisphenol A epoxy resin, the curing agent is a polyamide curing agent, the initial setting time of the repair mortar is 20-30 minutes, and the final setting time is 2-3 hours.

[0018] The beneficial effect of the present invention is that it solves the defects existing in the background technology, and solves the technical problem of easy peeling of traditional repairs through differentiated flushing, composite interface agent enhancement and self-leveling repair technology; specifically, it adopts a water-free flushing strategy for the missing area of ​​the expansion joint, dynamic air-drying control of the epoxy-cement composite interface agent, and precise proportioning of the fast-setting epoxy repair mortar, which can promptly deal with the problem of misalignment of cement road slabs. Not only is the repair efficiency high and the bonding strength significantly improved, but it also reduces project investment, shortens the construction period, and greatly reduces the disadvantages of the original road traffic obstruction. It is suitable for the rapid repair of cement roads. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a construction process flow chart of the present invention. DETAILED DESCRIPTION

[0020] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0021] like Figure 1A cement road repair method shown includes a surface pretreatment process, an interface strengthening treatment process, a rapid repair process, and maintenance and passage.

[0022] Example 1

[0023] 1. Use a 20MPa high-pressure water gun at a 50° inclination angle to wash away the mud and dirt in the misaligned area. It is forbidden to use high-pressure water to wash the area where the expansion joint grouting material is missing to prevent it from seeping into the foundation. The area where the expansion joint grouting material is missing is temporarily sealed with fast-setting polyurethane foam, and the sealing process continues until the rapid repair construction.

[0024] 2. Use a wire brush to clean the oil stains on the road surface, and then use high-pressure water to wash away the remaining debris;

[0025] 3. After the road surface is dried naturally for 24 hours, use a handheld chiseling machine (impact frequency 2000 times / min) to chisel the repaired surface to a depth of 4mm and a density of 25 pieces / cm 2 ;

[0026] 4. Remove the debris produced by chiseling and use a roller to evenly apply the interface agent (the amount of application is 0.4kg / m 2 ), air-dry for 1.5 hours at an ambient humidity of 50% until the surface is non-sticky;

[0027] 5. Mix epoxy resin and curing agent in a volume ratio of 2:1 to prepare self-leveling quick repair mortar;

[0028] 6. Pour the quick repair mortar on the misaligned area, fill the gaps by self-leveling, and manually flatten the local depressions to form a dense repair layer after 25 minutes of initial setting;

[0029] 7. Cover the repair layer with plastic film and allow it to cure naturally for 3 days at room temperature. External impact is prohibited during the curing period. Traffic will be allowed after the curing is completed.

[0030] Example 2

[0031] Add 10% steel fiber (length 6 mm) to the repair mortar in step 5 to improve the crack resistance.

[0032] Experimental data:

[0033] The repaired road surface was subjected to an accelerated loading test (equivalent axle load of 1 million times), and the results showed:

[0034] The bonding strength between the new and old interfaces is ≥2.5MPa (80% higher than the traditional method);

[0035] The recurrence rate of misalignment is less than 5% (30% for traditional methods).

[0036] The above description only describes the specific implementation mode of the present invention. Various examples do not limit the essential content of the present invention. After reading the description, ordinary technicians in the relevant technical field can modify or deform the specific implementation modes described above without departing from the essence and scope of the invention.

Claims

1. A method for repairing a cement road, characterized in that: The following steps are included: S1. Surface pretreatment: Use high-pressure water to wash away the mud on the surface of the road to be repaired. It is forbidden to use high-pressure water to wash the area where the expansion joint grouting material is missing; use a wire brush to clean the oil on the road surface, and use high-pressure water to wash away the remaining debris again; after the road surface is naturally dried, the cement road surface is roughened to form a rough interface; S2. Interface strengthening treatment: remove the debris produced by roughening, use a roller to evenly apply the interface agent, and let the interface agent air-dry for 1-3 hours until the surface is non-sticky; S3, quick repair construction: mix epoxy resin and curing agent in a volume ratio of 2:1 to prepare self-leveling quick repair mortar; pour the quick repair mortar on the misaligned area, fill the gaps by self-leveling, and manually level the local depressions; S4. Maintenance and traffic: The repair layer is naturally cured for 3 days at room temperature. External force impact is prohibited during the maintenance period. Traffic is allowed to open after the maintenance is completed.

2. A method for repairing a cement road as claimed in claim 1, characterized in that: In the step S1, the area where the expansion joint caulking material is missing is temporarily sealed with a quick-setting polyurethane foam, and the sealing process continues until the rapid repair construction.

3. A method for repairing a cement road as claimed in claim 1, characterized in that: In the step S1, the pressure range of high-pressure water washing is 15-25 MPa, and the washing angle is 45-60°. The chiseling treatment adopts mechanical chiseling equipment, and the chiseling density is 20-30 pieces / cm 2 The dents should be chiseled to a depth of 3-5mm.

4. A method for repairing a cement road as claimed in claim 1, characterized in that: In step S2, the amount of the interface agent applied is 0.3-0.5 kg / m 2 The air-drying time is dynamically adjusted according to the ambient humidity: air-dry for 1 hour when the humidity is ≤60%, and extend to 3 hours when the humidity is >60%.

5. A method for repairing a cement road as claimed in claim 1, characterized in that: In the step S3, the epoxy resin is bisphenol A epoxy resin, the curing agent is a polyamide curing agent, the initial setting time of the repair mortar is 20-30 minutes, and the final setting time is 2-3 hours.

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