A rapid road repair material, its preparation method and application

Abstract

A rapid road repair material, its preparation method and application belong to the technical field of road repair materials. The rapid road repair material contains the following components in parts by weight: 28 - 34.5 parts of ultra-fine portland cement, 6.0 - 11.6 parts of ultra-fine powder, 10.5 - 14.5 parts of sulfoaluminate cement, 27.0 - 29.3 parts of coarse sand, 16.5 - 18.9 parts of fine sand, 0.01 - 0.05 parts of cellulose ether, 0.07 - 0.15 parts of expansive agent, 0.20 - 0.25 parts of water reducing agent, 0.08 - 0.12 parts of retarding agent, 0.02 - 0.06 parts of lithium carbonate, 0.10 - 0.15 parts of defoaming agent, and 0.49 - 0.92 parts of redispersible latex powder. The rapid road repair material of the present invention has the characteristics of early strength, crack resistance, impact resistance, self-leveling, rapid curing at normal temperature and good adhesion to the original concrete. The compressive strength reaches more than 30 MPa in 4 hours, and the road surface can be opened to traffic 4 hours after repair; the 28-day compressive strength reaches more than 60 MPa.

Description

Technical Field

[0001] The present invention belongs to the technical field of road repair materials, and particularly relates to a rapid road repair material, a preparation method thereof and an application thereof. Background Art

[0002] The construction process of ordinary cement-based repair materials is complex, time-consuming, and requires a long traffic closure time. Moreover, the durability of new and old concrete is not very optimistic. The main reasons affecting the service life of traditional repair materials are poor permeability and adhesion of the base layer, and the adhesion strength is only 0.5 MPa. Affected by temperature and alternating stress, the base layer is prone to cracking, with poor toughness and durability. Due to the above reasons, overall cracking and peeling occur.

[0003] The existing road repair materials on the market currently have the following deficiencies. First, the repair time is relatively long, and the strength growth is slow. Usually, the strength is difficult to reach 15 MPa in 4 hours, and it is very difficult to achieve rapid traffic opening. Some even cannot open traffic for several days. Second, there is a common problem that the road repair materials have poor penetration and adhesion to the base layer, and it is very difficult to penetrate and adhere tightly to the base layer. Often, the durability is poor. Affected by the weather of cold and heat alternation for more than one year, it often cracks and peels off as a whole, seriously affecting the repair quality. Third, the maintenance time after repair is short, and there are problems that old cracks and temperature cracks cannot be repaired, seriously affecting the traffic roads and the economic and social development. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a rapid road repair material, a preparation method thereof and an application thereof. The rapid road repair material described in the present invention has the characteristics of early strength, crack resistance, impact resistance, self-leveling, rapid curing at normal temperature and good adhesion to the original concrete. The compressive strength reaches more than 30 MPa in 4 hours, and the road surface can be opened to traffic 4 hours after repair; the 28-day compressive strength reaches more than 60 MPa.

[0005] In order to achieve the above purpose, the rapid road repair material, in parts by weight, comprises the following components: 28 - 34.5 parts of ultra-fine Portland cement, 6.0 - 11.6 parts of ultra-fine powder, 10.5 - 14.5 parts of sulfoaluminate cement, 27.0 - 29.3 parts of coarse sand, 16.5 - 18.9 parts of fine sand, 0.01 - 0.05 parts of cellulose ether, 0.07 - 0.15 parts of expansion agent, 0.20 - 0.25 parts of water reducing agent, 0.08 - 0.12 parts of retarder, 0.02 - 0.06 parts of lithium carbonate, 0.10 - 0.15 parts of defoaming agent, 0.49 - 0.92 parts of redispersible latex powder.

[0006] The said ultra-fine portland cement is 31 - 33 parts, ultra-fine powder is 7.0 - 9.0 parts, sulphoaluminate cement is 11.5 - 13.0 parts, coarse sand is 28.0 - 29.1 parts, fine sand is 17.9 - 18.5 parts, cellulose ether is 0.02 - 0.04 parts, expansion agent is 0.08 - 0.10 parts, water-reducing agent is 0.21 - 0.23 parts, retarder is 0.9 - 0.11 parts, lithium carbonate is 0.03 - 0.05 parts, defoaming agent is 0.11 - 0.13 parts, redispersible latex powder is 0.6 - 0.8 parts. The above water-cement ratio is 0.17:1. If the water-cement ratio is too small, the hydration heat is relatively large, and the concrete is prone to cracking, which is not conducive to on-site construction operations; if the water-cement ratio is too large, the strength of the concrete will be reduced. Lithium carbonate has the effect of increasing strength; the cellulose ether in the mortar is dissolved in water, and due to the surface activity, it ensures the effective and uniform distribution of the cementitious materials in the system. As a protective colloid, the cellulose ether "wraps" the solid particles and forms a lubricating film on their outer surface, making the mortar system more stable and preventing cracks from occurring on the road surface; the sulphoaluminate cement is 300 mesh.

[0007] The said ultra-fine powder is composed of slag powder with a mass percentage of 19 - 21%, first-class fly ash with a mass percentage of 9 - 11%, DC-C13 enhancer with a mass percentage of 0.5 - 1.5%, PII52.5R cement with a mass percentage of 6 - 8% and compound gypsum with a mass percentage of 61 - 63%; the compound gypsum is composed of calcium sulphate with a mass percentage of 80% and hydrogen fluoride with a mass percentage of 20%. The ultra-fine powder has the characteristics of good filling property, corrosion resistance and good fluidity, and can adjust the setting time of the material at the same time; the ultra-fine powder is 700 - 900 mesh, preferably, the ultra-fine powder is 800 mesh, and the preferred ultra-fine powder can set quickly, with an initial setting time of 15 min and a final setting time of 50 min.

[0008] The average particle size of the said ultra-fine portland cement is D50 = 4 µm, D95 = 10 µm; the specific surface area is 1150 - 1250 m 2 / kg; the particle size distribution is 0.2 - 0.3 µm > 3.5%, 0.3 - 1.0 µm > 20%, 1.0 - 5.0 µm > 70% and 5.0 - 10.0 µm < 2.8%. The ultra-fine portland cement has good permeability, and the prepared slurry has good fluidity and diffusibility. The ultra-fine portland cement is 1000 - 1500 mesh, preferably, the ultra-fine portland cement is 1250 mesh; the preferred ultra-fine portland cement has a uniform particle distribution, flexural and compressive properties, and can greatly improve the adhesion and strength.

[0009] The particle size of the said coarse sand is 0.125 - 0.25 mm, and the particle size of the fine sand is 0.075 mm - 0.1 mm; adding different coarse sand and fine sand can adjust the particle gradation of the material, increase the density and obtain higher strength.

[0010] The strength grade of the ultra-fine portland cement is ≥75 MPa, and the strength grade of the sulfoaluminate cement is ≥42.5 MPa; the sulfoaluminate cement can control the setting time and can increase the early strength within 4 to 24 hours.

[0011] The expansion agent is UEA expansion agent, the water reducer is polycarboxylate water reducer, the retarder is sodium citrate, the defoamer is polyether defoamer, and the redispersible latex powder is a copolymer of ethylene and vinyl acetate. The UEA expansion agent can effectively compensate for the early shrinkage of the rapid repair material and reduce the cracking risk after use. The polycarboxylate water reducer has great dispersibility and a very high water reduction rate. Sodium citrate can improve the setting time, increase the tensile, compressive and anti-freezing properties, and at the same time facilitate construction. The polyether defoamer can eliminate the bubbles generated in the slurry and avoid the situation that the generation of bubbles affects the later strength. The redispersible latex powder, which is a copolymer of ethylene and vinyl acetate, has the characteristics of thermoplastic materials and constitutes an ideal bonding system with inorganic materials. Each component brings its own performance and complements each other, which can improve the bonding strength, cohesion and wear resistance; it has a small rebound depth and good impact resistance; it enhances the flexural strength and durability, and reduces the water absorption.

[0012] Cellulose ether is dissolved in water. Due to the surface activity effect, it ensures the effective and uniform distribution of the gelling material in the system. As a protective colloid, cellulose ether "wraps" the solid particles and forms a lubricating film on its outer surface, making the mortar system more stable and preventing the generation of road surface cracks.

[0013] The present invention also provides a preparation method of a road rapid repair material, which includes the following steps:

[0014] (1) Stir the ultra-fine portland cement, sulfoaluminate cement, coarse sand, fine sand and superfine powder at a rate of 90 - 110 r / min for 3 - 5 min, and mix them evenly to obtain component A;

[0015] (2) Stir and mix cellulose ether, expansion agent, polycarboxylate water reducer, retarder, polyether defoamer, redispersible latex powder and lithium carbonate at a rate of 110 - 130 r / min for 3 - 5 min to obtain component B;

[0016] (3) Stir component A and component B at a rate of 90 - 110 r / min for 30 - 35 min, mix them evenly, and package and seal them in a three-layer composite film self-sealing bag to obtain the road rapid repair material.

[0017] The stirring equipment required for the stirring in step (1) includes a stirring tank, a stirring shaft, an air charging tank and a blower. The stirring shaft is arranged in the stirring tank. The air outlet of the air charging tank is communicated with the lower part of the stirring tank, and the air inlet of the air charging tank is connected to the blower. Turn on the blower to make the materials suspended and fully homogenized in the stirring tank.

[0018] The diameter of the double-shaft mixer is 700 mm, and the length of the trough body is 3000 - 4000 mm. The double-shaft mixer has the advantages of high efficiency, small floor area, compact structure, good sealing performance, stable operation, long service life, and safe and simple operation. The blower is a Roots blower.

[0019] The packaging machine mentioned is a rotary packaging machine, which has the advantages of high automation degree, fast packaging speed, being applicable to the packaging of various types of products, high safety factor, high bag-making precision, and easy operation. The three-layer composite film valve bag can prevent the material from getting damp and solidifying.

[0020] The rapid repair material is used for road repair. The construction steps of the road rapid repair material are as follows: (1) Cleaning, (2) Moistening, (3) Adding diamond-shaped steel mesh, and the preparation of the rapid repair material: The water addition amount accounts for 15% - 16% of the total mass of the repair material, (4) Repairing, (5) Maintenance.

[0021] (1) Cleaning: First, pick out the loose parts of the bulging, peeling, and cracked and damaged parts. If the picking is not clean, it will affect the bonding strength of the later ground. For parts less than 3 mm, overly flat parts, and parts with oil stains, roughening treatment should be carried out. The roughening method is to use a professional scarifying machine or manually chisel with an electric pickaxe; Sweep the floating soil and sundries on the bottom surface clean and flush them clean with a high-pressure water gun. When flushing, the slurry should be washed out of the working surface and backflow should be prevented.

[0022] (2) Moistening: After flushing with water, the water should be retained on the working surface for 3 - 5 minutes to fully moisten the working surface until there is no more water seepage (observing that there are no bubbles emerging). During construction, the working surface must be kept in a moist state, but there should be no ponding.

[0023] (3) Adding diamond-shaped steel mesh and the preparation of the rapid repair material: Add the diamond-shaped steel mesh under the moist state of the working surface. The size of the diamond-shaped steel mesh is 20 * 20 * 2 mm; The diamond-shaped steel mesh can increase the overall strength, and at the same time has a protective performance for steel bars, can be used in wet bases and wet environments, and can be used as an emergency repair material; Preparation of the rapid repair material: First pour water into the container and then put the road rapid repair material, mix and stir the road rapid repair material and water. The water addition amount accounts for 15% - 16% of the total mass of the repair material. Adding more water is strictly prohibited; During stirring, it must be fully stirred evenly until there are no dry powder bubbles observed.

[0024] (4) Repairing: Pour the road rapid repair material mixed evenly with water onto the treated working surface and spread it flat with a scraper or trowel; Complete the construction within 30 minutes from adding water.

[0025] (5) Curing: The road surface within 1 - 2 hours after construction needs to be sprayed with clean water to keep it moist. The effect of maintaining moisture can be achieved by covering it with moist burlap or plant fiber canvas, which can reduce the rise of surface temperature and prevent premature cracking.

[0026] Packaging, transportation and storage: It is packaged in a three - layer film - self - sealing bag, 25 kg per bag, and the shelf life is 6 months.

[0027] It must be stored in a dry and well - ventilated room. The packaging bag should be sealed, and attention should be paid to moisture and frost prevention.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] (1) The rapid road repair material described in the present invention has the characteristics of early strength, crack resistance, impact resistance, self - leveling, rapid curing at normal temperature and good adhesion to the original concrete. The compressive strength reaches over 30 MPa in 4 hours, and the road surface can be opened to traffic 4 hours after repair; the 28 - day compressive strength reaches over 60 MPa.

[0030] (2) The rapid road repair material described in the present invention has strong adhesion, anti - spalling, excellent durability and a thermal expansion coefficient close to that of concrete; it can restore the original performance of the concrete road surface and has good impermeability at the same time.

[0031] (3) The rapid road repair material described in the present invention is an alkaline system, has good compatibility with cement and no corrosion to steel bars; the diamond - shaped steel mesh can increase the overall strength and has a protective performance for steel bars, and it can be used in wet bases and wet environments.

[0032] (4) The rapid road repair material described in the present invention is non - toxic to the human body and has the property of being non - flammable, safe, environmentally friendly, and convenient for storage and transportation. Brief description of the drawings

[0033] Figure 1 It is a top view of a twin - shaft mixer.

[0034] Figure 2 It is a side view of a twin - shaft mixer.

[0035] Wherein: 1. Mixing tank 2. Mixing shaft 3. Inlet of the inflatable tank 4. Outlet of the inflatable tank 5. Inflatable tank 6. Fan. Specific embodiments

[0036] The following further illustrates the present invention with reference to embodiments, and Embodiment 4 is the best embodiment of the present invention.

[0037] The chemical additives used in the embodiments and comparative examples of the present invention are all commercially available, and the specific information is as follows:

[0038] Ultrafine silicate cement: industrial grade, purchased from Shandong Donghua Technology Co., Ltd.; slag powder: industrial grade, purchased from Lingshou Zhaochen Mineral Products Co., Ltd.; primary fly ash: industrial grade, purchased from Lingshou Laipeng Mineral Products Business Department; calcium sulfate: industrial grade, Jinan Deqiao Chemical Technology Co., Ltd.; hydrogen fluoride: industrial grade, Shandong Weijin Chemical Technology Co., Ltd.; DC-C13 enhancer, industrial grade, purchased from Beijing Dechang Weiye Construction Engineering Technology Co., Ltd.; PII52.5R cement: industrial grade, purchased from Taizhou Jingmei Building Materials Co., Ltd.; sulphoaluminate cement: industrial grade, purchased from Qiyin Cement Plant Co., Ltd.; coarse sand: industrial grade, purchased from Tianjin Senda Weiye Building Materials Co., Ltd.; fine sand: industrial grade, purchased from Tianjin Senda Weiye Building Materials Co., Ltd.; cellulose ether: industrial grade, purchased from Jinan Ruilin Chemical Co., Ltd.; UEA expander: industrial grade, purchased from Shandong Ruiyuan Biotechnology Co., Ltd.; polycarboxylic acid water reducer: industrial grade, purchased from Shandong Bofei Cement Technology Service Co., Ltd.; sodium citrate: industrial grade, purchased from Shandong Kunteng Chemical Co., Ltd.; lithium carbonate: industrial grade, purchased from Shandong Suihua Biotechnology Co., Ltd.; polyether defoamer: industrial grade, purchased from Shandong Yuquan New Materials Technology Co., Ltd.; redispersible latex powder: industrial grade, purchased from Shandong Kaimaoxing Chemical Co., Ltd.; diamond steel mesh: industrial grade, purchased from Anping County Yuefeng Stainless Steel Trading Co., Ltd.; twin-shaft mixer: model ZJ700, purchased from Zhengkuang Machinery; water: ordinary tap water.

[0039] Example 1

[0040] A method for preparing a road rapid repair material comprises the following steps:

[0041] (1) 28 parts of ultrafine silicate cement (1250 mesh), 14.5 parts of sulphoaluminate cement (300 mesh), 28.5 parts of coarse sand, 18.8 parts of fine sand and 9.0 parts of ultrafine powder (800 mesh), wherein the ultrafine powder consists of 20% by weight of slag powder, 10% by weight of primary fly ash, 1% by weight of DC-C13 reinforcing agent, 7% by weight of PII52.5R cement and 62% by weight of compound gypsum, are measured by a spiral metering scale and mixed in a twin-shaft mixer, and stirred at a rate of 100 r / min for 4 min to obtain component A.

[0042] See also Figures 1 - 2 The double-shaft stirring in this embodiment includes a stirring box 1, a stirring shaft 2, an aeration box 5 and a fan 6. The stirring shaft 2 is arranged in the stirring box, the air outlet 4 of the aeration box 5 is connected to the lower part of the stirring box 1, and the air inlet 3 of the aeration box is connected to the fan 6. Turn on the fan 6 to suspend the material in the stirring box 1 and fully homogenize it. This equipment is used in the embodiments of the present invention.

[0043] (2) Weigh 0.04 parts of cellulose ether, 0.08 parts of UEA expansive agent, 0.24 parts of polycarboxylate water reducer, 0.12 parts of sodium citrate, 0.12 parts of polyether defoamer, 0.55 parts of redispersible latex powder and 0.05 parts of lithium carbonate using an electronic scale. After that, mix them at a rate of 120 r / min for 4 min to obtain Component B.

[0044] (3) Stir Component A and Component B at a rate of 100 r / min for 33 min. After mixing evenly, the rapid road repair material is obtained.

[0045] The construction steps of the rapid road repair material are as follows:

[0046] (1) Cleaning: First, pick out the loose parts of the bulging, peeling and cracked damaged parts; Clean the floating soil and sundries on the bottom surface, and flush them clean with a high-pressure water gun. When flushing, the mud should be washed out of the working surface and backflow should be prevented;

[0047] (2) Moistening: After flushing with water, the water should be retained on the working surface for 4 min to fully moisten the working surface until no more water seeps (observing that no bubbles emerge). During construction, the working surface must be kept in a moist state, but there should be no ponding;

[0048] (3) Add diamond-shaped steel mesh: Add diamond-shaped steel mesh under the moist state of the working surface. The size of the diamond-shaped steel mesh is 20*20*2 mm; Prepare the rapid repair material. First, pour water into the container and then put the rapid road repair material. Mix the rapid road repair material with 15.5 parts of water and stir. During stirring, it must be stirred evenly. Observe that there are no dry powder bubbles;

[0049] (4) Repair: Pour the road rapid repair material mixed evenly with water onto the treated working surface and spread it flat with a scraper;

[0050] (5) Maintenance: The road surface within 1.5 hours after construction needs to be sprayed with clean water to keep it moist, and the effect of keeping it moist is achieved by covering it with a moist burlap.

[0051] Example 2

[0052] A preparation method of a rapid road repair material includes the following steps:

[0053] (1) Weigh 29.5 parts (1250 mesh) of ultrafine portland cement, 13 parts (300 mesh) of sulfoaluminate cement, 28 parts of coarse sand, 17.9 parts of fine sand and 10.5 parts (800 mesh) of ultrafine powder. The ultrafine powder is composed of 20% slag powder by mass percentage, 10% first-class fly ash by mass percentage, 1% DC-C13 enhancer by mass percentage, 7% PII52.5R cement by mass percentage and 62% compound gypsum by mass percentage. After weighing with a spiral weighing scale, mix them in a twin-shaft mixer and stir at a rate of 100 r / min for 4 min to obtain Component A;

[0054] (2) Weigh 0.03 parts of cellulose ether, 0.09 parts of UEA expansive agent, 0.22 parts of polycarboxylate water reducer, 0.11 parts of sodium citrate, 0.12 parts of polyether defoamer, 0.49 parts of redispersible latex powder and 0.04 parts of lithium carbonate. After weighing with an electronic scale, stir and mix at a rate of 120 r / min for 4 min to obtain Component B;

[0055] (3) Stir Component A and Component B at a rate of 100 r / min for 33 min. After mixing evenly, the rapid road repair material is obtained.

[0056] The construction steps of the rapid road repair material are as follows:

[0057] (1) Cleaning: First, pick out the loose parts at the bulging, peeling and cracked damaged parts; sweep the floating soil and sundries on the bottom surface clean, and flush them clean with a high-pressure water gun. When flushing, the mud should be washed out of the working surface and backflow should be prevented;

[0058] (2) Moistening: After flushing with water, keep the water on the working surface for 4 min to fully moisten the working surface until no more water seeps out (observing that no bubbles emerge). During construction, the working surface must be kept in a moist state, but there should be no ponding;

[0059] (3) Add diamond-shaped steel mesh: Add diamond-shaped steel mesh under the moist state of the working surface. The size of the diamond-shaped steel mesh is 20*20*2 mm; Prepare the rapid repair material. First, pour water into a container and then put the rapid road repair material into it. Mix the rapid road repair material with 15.5 parts of water and stir. During stirring, it must be fully stirred evenly until no dry powder bubbles are observed;

[0060] (4) Repair: Pour the road rapid repair material mixed evenly with water onto the processed working surface and spread it flat with a scraper;

[0061] (5) Curing: The road surface within 1.5 hours after construction needs to be sprayed with clean water to keep it moist, and the effect of keeping it moist is achieved by covering it with a moist burlap.

[0062] Example 3

[0063] A preparation method of a rapid road repair material includes the following steps:

[0064] (1) Weigh 28 parts (1250 mesh) of ultrafine portland cement, 14.5 parts (300 mesh) of sulfoaluminate cement, 28.5 parts of coarse sand, 18.9 parts of fine sand and 9.0 parts (800 mesh) of superfine powder. The superfine powder consists of 20% slag powder by mass percentage, 10% first-class fly ash by mass percentage, 1% DC-C13 enhancer by mass percentage, 7% PII52.5R cement by mass percentage and 62% compound gypsum by mass percentage. After measuring with a spiral weighing scale, mix them in a twin-shaft mixer and stir at a rate of 100 r / min for 4 min to obtain component A;

[0065] (2) Weigh 0.04 parts of cellulose ether, 0.15 parts of UEA expansion agent, 0 parts of polycarboxylate water reducer, 0.12 parts of sodium citrate, 0.13 parts of polyether defoamer, 0.60 parts of redispersible latex powder and 0.06 parts of lithium carbonate. After measuring with an electronic scale, stir and mix at a rate of 120 r / min for 4 min to obtain component B;

[0066] (3) Stir component A and component B at a rate of 100 r / min for 33 min. After mixing evenly, the rapid road repair material is obtained.

[0067] The construction steps of the rapid road repair material are as follows:

[0068] (1) Cleaning: First, pick out the loose parts of the bulging, peeling and cracked damaged parts; sweep the floating soil and sundries on the bottom surface clean, and flush them clean with a high-pressure water gun. When flushing, the mud should be washed out of the working surface and backflow should be prevented;

[0069] (2) Moistening: After flushing with water, keep the water on the working surface for 4 min to fully moisten the working surface until there is no more water seepage (observing that there are no bubbles emerging). During construction, the working surface must be kept in a moist state, but there should be no ponding;

[0070] (3) Adding diamond steel mesh: Add diamond steel mesh under the moist state of the working surface. The size of the diamond steel mesh is 20*20*2 mm; Prepare the rapid repair material. First, pour water into a container and then put the rapid road repair material into it. Mix the rapid road repair material with 15.5 parts of water and stir. During stirring, it must be stirred evenly. Observe that there are no dry powder bubbles;

[0071] (4) Repairing: Pour the rapid road repair material mixed evenly with water onto the treated working surface and spread it flat with a scraper;

[0072] (5) Curing: The road surface within 1.5 hours after construction needs to be sprayed with clear water to keep it moist, and the effect of keeping it moist is achieved by covering it with a moist burlap.

[0073] Example 4

[0074] A preparation method of a rapid road repair material includes the following steps:

[0075] (1) Weigh 32 parts (1250 mesh) of ultrafine portland cement, 12.2 parts (300 mesh) of sulfoaluminate cement, 28.5 parts of coarse sand, 18 parts of fine sand and 8 parts (800 mesh) of ultrafine powder. The ultrafine powder consists of 20% by mass of slag powder, 10% by mass of class I fly ash, 1% by mass of DC-C13 enhancer, 7% by mass of PII52.5R cement and 62% by mass of compound gypsum. After weighing with a spiral weighing scale, mix them in a twin-shaft mixer and stir at a rate of 100 r / min for 4 min to obtain component A;

[0076] (2) Weigh 0.03 part of cellulose ether, 0.09 part of UEA expansive agent, 0.22 part of polycarboxylate water reducer, 0.1 part of sodium citrate, 0.12 part of polyether defoamer, 0.70 part of redispersible latex powder and 0.04 part of lithium carbonate. After weighing with an electronic scale, stir and mix at a rate of 120 r / min for 3 min to obtain component B;

[0077] (3) Stir component A and component B at a rate of 100 r / min for 33 min. After mixing evenly, the rapid road repair material is obtained.

[0078] The construction steps of the rapid road repair material are as follows:

[0079] (1) Cleaning: First, pick out the loose parts of the bulging, peeling and cracked damaged parts; sweep the floating soil and sundries on the bottom surface clean, and flush them clean with a high-pressure water gun. When flushing, the mud should be washed out of the working surface and backflow should be prevented;

[0080] (2) Moistening: After flushing with water, the water should be retained on the working surface for 4 min to fully moisten the working surface until no more water seeps out (observing that no bubbles emerge). During construction, the working surface must be kept in a moist state, but there should be no ponding;

[0081] (3) Adding diamond steel mesh: Add diamond steel mesh under the moist state of the working surface. The size of the diamond steel mesh is 20*20*2 mm; Prepare the rapid repair material. First, pour water into a container and then put the rapid road repair material into it. Mix the rapid road repair material with 15.5 parts of water and stir. During stirring, it must be stirred evenly. Observe that there are no dry powder bubbles;

[0082] (4) Repairing: Pour the road rapid repair material mixed evenly with water onto the processed working surface and spread it flat with a squeegee;

[0083] (5) Curing: The road surface within 1.5 hours after construction needs to be sprayed with clean water to keep it moist, and the effect of keeping it moist is achieved by covering it with wet burlap.

[0084] Example 5

[0085] A preparation method of a rapid road repair material includes the following steps:

[0086] (1) Weigh 29.5 parts (1250 mesh) of ultrafine portland cement, 13 parts (300 mesh) of sulfoaluminate cement, 28 parts of coarse sand, 17.9 parts of fine sand, and 10.5 parts (800 mesh) of ultrafine powder. The ultrafine powder is composed of 20% by mass of slag powder, 10% by mass of grade I fly ash, 1% by mass of DC-C13 enhancer, 7% by mass of PII52.5R cement, and 62% by mass of compound gypsum. After weighing with a spiral weighing scale, mix them in a double-shaft mixer and stir at a rate of 100 r / min for 4 min to obtain Component A;

[0087] (2) Weigh 0.04 part of cellulose ether, 0 part of UEA expansion agent, 0.25 part of polycarboxylate water reducer, 0.12 part of sodium citrate, 0.13 part of polyether defoamer, 0.50 part of redispersible latex powder, and 0.06 part of lithium carbonate. After weighing with an electronic scale, stir and mix at a rate of 120 r / min for 4 min to obtain Component B;

[0088] (3) Stir Component A and Component B at a rate of 100 r / min for 33 min. After mixing evenly, the rapid road repair material is obtained.

[0089] The construction steps of the rapid road repair material are as follows:

[0090] (1) Cleaning: First, pick out the loose parts of the bulging, peeling, and cracked and damaged parts; clean the floating soil and sundries on the bottom surface, and flush it clean with a high-pressure water gun. When flushing, the mud should be washed out of the working surface and backflow should be prevented;

[0091] (2) Moistening: After flushing with water, the water should be retained on the working surface for 4 min to fully moisten the working surface until no more water seeps out (observing that no bubbles emerge). During construction, the working surface must be kept moist, but there should be no ponding;

[0092] (3) Adding diamond-shaped steel mesh: Add the diamond-shaped steel mesh under the moist state of the working surface. The size of the diamond-shaped steel mesh is 20*20*2 mm; Prepare the rapid repair material. First, pour water into a container and then put the rapid road repair material into it. Mix the rapid road repair material with 15.5 parts of water and stir. During stirring, it must be stirred evenly. Observe that there are no dry powder bubbles;

[0093] (4)Patching: Pour the road rapid patching material evenly mixed with water onto the treated working surface and spread it flat with a squeegee.

[0094] (5)Curing: The road surface within 1.5 hours after construction needs to be sprayed with clear water to keep it moist, and the effect of keeping it moist is achieved by covering it with a moistened linen cloth.

[0095] Example 6

[0096] A preparation method of a road rapid patching material includes the following steps:

[0097] (1)Weigh 34.5 parts (1250 mesh) of ultra-fine portland cement, 11.3 parts (300 mesh) of sulfoaluminate cement, 29.3 parts of coarse sand, 16.5 parts of fine sand, and 7 parts (800 mesh) of ultra-fine powder. The ultra-fine powder is composed of 20% slag powder by mass percentage, 10% primary fly ash by mass percentage, 1% DC-C13 enhancer by mass percentage, 7% PII52.5R cement by mass percentage, and 62% compound gypsum by mass percentage. After weighing with a spiral weighing scale, mix them in a twin-shaft mixer and stir at a rate of 100 r / min for 4 min to obtain Component A.

[0098] (2)Weigh 0.02 parts of cellulose ether, 0.12 parts of UEA expansive agent, 0.2 parts of polycarboxylate water reducer, 0.08 parts of sodium citrate, 0.11 parts of polyether defoamer, 0.84 parts of redispersible latex powder, and 0.03 parts of lithium carbonate. After weighing with an electronic scale, stir and mix at a rate of 120 r / min for 4 min to obtain Component B.

[0099] (3)Stir Component A and Component B at a rate of 100 r / min for 33 min. After mixing evenly, the road rapid patching material is obtained.

[0100] The construction steps of the road rapid patching material are as follows:

[0101] (1)Cleaning: First, pick out the loose parts of the bulging, peeling, and cracked and damaged parts; sweep the floating soil and sundries on the bottom surface clean, and flush it clean with a high-pressure water gun. When flushing, the mud should be washed out of the working surface and backflow should be prevented.

[0102] (2)Moistening: After flushing with water, the water should be retained on the working surface for 4 min to fully moisten the working surface until there is no more water seepage (observing that there are no bubbles emerging). During construction, the working surface must be kept in a moist state, but there should be no ponding.

[0103] (3) Add diamond-shaped steel mesh: Add diamond-shaped steel mesh under the wet working surface. The size of the diamond-shaped steel mesh is 20*20*2mm; Prepare the rapid road repair material. First, pour water into the container and then put the rapid road repair material into it. Mix the rapid road repair material with 15.5 parts of water and stir thoroughly. Make sure there are no dry powder bubbles during stirring;

[0104] (4) Repair: Pour the rapidly repaired road material evenly mixed with water onto the treated working surface and spread it flat with a squeegee;

[0105] (5) Maintenance: The road surface within 1.5 hours after construction needs to be sprayed with clean water to keep it wet, and the wet effect can be achieved by covering it with wet burlap.

[0106] Example 7

[0107] A preparation method of a rapid road repair material includes the following steps:

[0108] (1) Weigh 31 parts of ultra-fine portland cement (1250 mesh), 10.50 parts of sulfoaluminate cement (300 mesh), 27 parts of coarse sand, 18.5 parts of fine sand, and 11.6 parts of ultra-fine powder (800 mesh). The ultra-fine powder consists of 20% slag powder by mass percentage, 10% first-class fly ash by mass percentage, 1% DC-C13 enhancer by mass percentage, 7% PII52.5R cement by mass percentage, and 62% compound gypsum by mass percentage. After weighing with a spiral weighing scale, mix them in a double-shaft mixer and stir at a rate of 100 r / min for 4 min to obtain component A;

[0109] (2) Weigh 0.05 part of cellulose ether, 0.07 part of UEA expansion agent, 0.23 part of polycarboxylate water reducer, 0.10 part of sodium citrate, 0.10 part of polyether defoamer, 0.80 part of redispersible latex powder, and 0.05 part of lithium carbonate. After weighing with an electronic scale, stir and mix at a rate of 120 r / min for 4 min to obtain component B;

[0110] (3) Stir component A and component B at a rate of 100 r / min for 33 min. After mixing evenly, the rapid road repair material is obtained.

[0111] The construction steps of the rapid road repair material are as follows:

[0112] (1) Cleaning: First, pick out the loose parts at the bulging, peeling, and cracked and damaged parts; Clean the floating soil and sundries on the bottom surface, and flush it clean with a high-pressure water gun. When flushing, the mud should be washed out of the working surface and backflow should be prevented;

[0113] (2)Water moistening: After flushing with water, water should be retained on the working surface for 4 minutes to fully moisten the working surface until there is no more water seepage (observing that no bubbles emerge). During construction, the working surface must be kept moist, but there should be no ponding water;

[0114] (3)Adding diamond-shaped steel mesh: Add diamond-shaped steel mesh under the moist state of the working surface. The size of the diamond-shaped steel mesh is 20*20*2mm; Prepare the rapid road repair material. First, pour water into a container and then put in the rapid road repair material. Mix the rapid road repair material with 15.5 parts of water and stir. During stirring, it must be stirred evenly. Observe that there are no dry powder bubbles;

[0115] (4)Repairing: Pour the rapid road repair material evenly mixed with water onto the processed working surface and level it with a squeegee;

[0116] (5)Maintenance: The road surface within 1.5 hours after construction needs to be sprayed with clean water to keep it moist, and the effect of keeping it moist is achieved by covering it with a moist burlap.

[0117] Example 8

[0118] A preparation method of a rapid road repair material includes the following steps:

[0119] (1)Weigh 33 parts (1250 mesh) of ultra-fine portland cement, 11.5 parts (300 mesh) of sulfoaluminate cement, 29.1 parts of coarse sand, 18.9 parts of fine sand, and 6.0 parts (800 mesh) of superfine powder. The superfine powder is composed of 20% by mass of slag powder, 10% by mass of class I fly ash, 1% by mass of DC-C13 enhancer, 7% by mass of PII52.5R cement, and 62% by mass of compound gypsum. After weighing with a spiral weighing scale, mix them in a twin-shaft mixer and stir at a rate of 100 r / min for 4 minutes to obtain Component A;

[0120] (2)Weigh 0.01 part of cellulose ether, 0.10 part of UEA expansive agent, 0.21 part of polycarboxylate water reducer, 0.09 part of sodium citrate, 0.15 part of polyether defoamer, 0.92 part of redispersible latex powder, and 0.02 part of lithium carbonate. After weighing with an electronic scale, stir and mix at a rate of 120 r / min for 4 minutes to obtain Component B;

[0121] (3)Stir Component A and Component B at a rate of 100 r / min for 33 minutes. After mixing evenly, the rapid road repair material is obtained.

[0122] The construction steps of the rapid road repair material are as follows:

[0123] (1) Cleaning: First, pick out the loose parts of the bulging, peeling, cracked and damaged parts; clean the floating soil and sundries on the bottom surface, flush it clean with a high-pressure water gun. When flushing, the slurry should be flushed out of the working surface and backflow should be prevented.

[0124] (2) Moistening: After flushing with water, the water should be retained on the working surface for 4 minutes to fully moisten the working surface until there is no more water seepage (observing that no bubbles emerge). During construction, the working surface must be kept moist, but there should be no ponding.

[0125] (3) Adding diamond-shaped steel mesh: Add diamond-shaped steel mesh under the moist state of the working surface. The size of the diamond-shaped steel mesh is 20*20*2mm; prepare the rapid road repair material. First, pour water into the container and then put in the rapid road repair material. Mix the rapid road repair material with 15.5 parts of water and stir. During stirring, it must be stirred evenly. Observe that there are no dry powder bubbles.

[0126] (4) Repairing: Pour the rapidly mixed road repair material with water onto the treated working surface and level it with a scraper.

[0127] (5) Curing: The road surface within 1.5 hours after construction needs to be sprayed with clean water to keep it moist, and the effect of keeping it moist is achieved by covering it with a moist burlap.

[0128] Example 9

[0129] A preparation method of a rapid road repair material, comprising the following steps:

[0130] (1) Take 32 parts (1000 mesh) of ultra-fine portland cement, 12.2 parts (300 mesh) of sulfoaluminate cement, 28.5 parts of coarse sand, 18 parts of fine sand, 8 parts of ultra-fine powder (700 mesh). The ultra-fine powder is composed of 19% by mass of slag powder, 9% by mass of Class I fly ash, 0.5% by mass of DC-C13 enhancer, 6% by mass of PII52.5R cement and 61% by mass of compound gypsum. After weighing with a spiral weighing scale, mix them in a twin-shaft mixer and stir at a rate of 90 r / min for 3 minutes to obtain Component A;

[0131] (2) Take 0.03 parts of cellulose ether, 0.09 parts of UEA expansion agent, 0.22 parts of polycarboxylate water reducer, 0.1 part of sodium citrate, 0.12 parts of polyether defoamer, 0.70 parts of redispersible latex powder and 0.04 parts of lithium carbonate. After weighing with an electronic scale, stir and mix at a rate of 110 r / min for 3 minutes to obtain Component B;

[0132] (3) Stir Component A and Component B at a rate of 90 r / min for 30 minutes. After mixing evenly, the rapid road repair material is obtained.

[0133] The construction steps of the road rapid repair material are as follows:

[0134] (1)Cleaning: First, pick out the loose parts at the bulging, peeling, and cracked and damaged parts; sweep the floating soil and sundries on the bottom surface clean, flush it with a high-pressure water gun. When flushing, the mud should be washed out of the working surface and backflow should be prevented;

[0135] (2)Moistening: After flushing with water, the water should be retained on the working surface for 3 minutes to fully moisten the working surface until there is no more water seepage (observing that there are no bubbles emerging). During construction, the working surface must be kept in a moist state, but there should be no ponding;

[0136] (3)Adding diamond-shaped steel mesh: Add the diamond-shaped steel mesh under the moist state of the working surface. The size of the diamond-shaped steel mesh is 20*20*2mm; Prepare the rapid repair material. First, pour water into the container and then put in the road rapid repair material. Mix the road rapid repair material with 15 parts of water and stir. When stirring, it must be stirred evenly. Observe that there are no dry powder bubbles;

[0137] (4)Repairing: Pour the road rapid repair material mixed evenly with water onto the processed working surface and spread it flat with a trowel;

[0138] (5)Maintenance: The road surface within 1 hour after construction needs to be sprayed with clear water to keep it moist, and the effect of keeping it moist is achieved by covering with a moist plant fiber canvas.

[0139] Example 10

[0140] A preparation method of a road rapid repair material includes the following steps:

[0141] (1)Put 32 parts (1500 mesh) of ultra-fine portland cement, 12.2 parts (300 mesh) of sulfoaluminate cement, 28.5 parts of coarse sand, 18 parts of fine sand, 8 parts of ultra-fine powder (900 mesh). The ultra-fine powder is composed of 21% by mass of slag powder, 11% by mass of class I fly ash, 1.5% by mass of DC-C13 enhancer, 7% by mass of PII52.5R cement, and 63% by mass of compound gypsum. After measuring with a spiral weighing scale, mix them in a twin-shaft mixer and stir at a rate of 110 r / min for 5 minutes to obtain Component A;

[0142] (2)Put 0.03 parts of cellulose ether, 0.09 parts of UEA expansion agent, 0.22 parts of polycarboxylate water reducer, 0.1 part of sodium citrate, 0.12 parts of polyether defoamer, 0.70 parts of redispersible latex powder, and 0.04 parts of lithium carbonate. After measuring with an electronic scale, stir and mix at a rate of 130 r / min for 5 minutes to obtain Component B;

[0143] (3) Stir components A and B at a rate of 110 r / min for 35 min. After mixing evenly, the rapid road repair material is obtained.

[0144] The construction steps of the rapid road repair material are as follows:

[0145] (1) Cleaning: First, pick out the loose parts of the bulging, peeling, cracked and damaged parts; sweep the floating soil and sundries on the bottom surface clean, and flush them clean with a high-pressure water gun. When flushing, the mud should be washed out of the working surface and backflow should be prevented;

[0146] (2) Moistening: After flushing with water, the water should be retained on the working surface for 5 min to fully moisten the working surface until there is no more water seepage (observing that no bubbles emerge). During construction, the working surface must be kept moist, but there should be no ponding;

[0147] (3) Adding diamond-shaped steel mesh: Add diamond-shaped steel mesh under the moist state of the working surface. The size of the diamond-shaped steel mesh is 20*20*2 mm; Preparation of the rapid repair material: First, pour water into the container and then put in the rapid road repair material. Mix the rapid road repair material with 16 parts of water and stir. During stirring, it must be stirred evenly. Observe that there are no dry powder bubbles;

[0148] (4) Repairing: Pour the rapid road repair material mixed evenly with water onto the treated working surface and spread it flat with a trowel;

[0149] (5) Curing: The road surface within 2 hours after construction needs to be sprayed with clear water to keep it moist, and the effect of keeping it moist is achieved by covering with a moist plant fiber canvas.

[0150] Comparative Example 1

[0151] The preparation method of the rapid road repair material described in this comparative example is the same as that of Example 4, except that ultra-fine Portland cement is not added to the raw materials, and 44.2 parts of sulfoaluminate cement are added.

[0152] Comparative Example 2

[0153] The preparation method of the rapid road repair material described in this comparative example is the same as that of Example 4, except that sulfoaluminate cement is not added to the raw materials, and 44.2 parts of ultra-fine Portland cement are added.

[0154] Comparative Example 3

[0155] The preparation method of the rapid road repair material described in this comparative example is the same as that of Example 4, except that ultra-fine powder is not added to the raw materials, and 36 parts of ultra-fine Portland cement and 16.2 parts of sulfoaluminate cement are added.

[0156] Performance test

[0157] The performance of the road rapid repair materials prepared in the examples and comparative examples was tested, and the specific test results are shown in Table 1.

[0158] The setting time of the road rapid repair material was tested in accordance with GB / T 1346-2011 "Test Methods for Water Requirement for Normal Consistency, Setting Time and Soundness of Cement".

[0159] The compressive strength of the road rapid repair material was tested in accordance with GB / T 17671-2021 "Test Methods for the Strength of Cement Mortar (ISO Method)".

[0160] The bond strength of the road rapid repair material was tested in accordance with JG / J 70-2009 "Standard Test Methods for Basic Properties of Building Mortars".

[0161] The anti-cracking performance of the road rapid repair material was tested in accordance with JC / T 2234-2014 "Test Method for Early Anti-cracking Property of Cement".

[0162] The impact resistance of the road rapid repair material was tested in accordance with GB / T 50475 "Technical Code for Detection of Concrete Rebound".

[0163] The self-leveling performance of the road rapid repair material was tested in accordance with JC / T 985-2017 "Cementitious Self-leveling Mortar for Floor".

[0164] Table 1 Test Results of the Performance of the Road Rapid Repair Materials in Examples and Comparative Examples 。

[0165] It can be seen from the results in Table 1 that the road rapid repair material provided by the present invention has the characteristics of early strength, anti-cracking, impact resistance, self-leveling, rapid curing at normal temperature and good adhesion to the original concrete. The compressive strength reaches over 30 MPa in 4 hours, and the road surface can be opened to traffic 4 hours after pavement repair, laying a foundation for rapid construction and ensuring construction quality. The water-cement ratio is 0.17:1, and it also has good physical and mechanical properties and impermeability. The durability and compressive capacity are improved, and the thermal expansion coefficient is close to that of concrete. The 28-day compressive strength is all as high as over 60 MPa, solving the problems of difficult repair of damaged road surfaces, poor bonding with concrete and cracking of the base concrete by epoxy mortar.

[0166] Through the research and preparation of various high-performance materials, the present invention effectively solves the common problems of base bonding, inability to repair cracks and slow strength growth, realizes rapid pavement repair, and the maintenance time of the repaired road surface only needs 1-2 hours, improving the durability of the repaired road surface and reducing traffic costs.

[0167] It can be seen from the performance test results of Comparative Example 1 that ultrafine portland cement can improve compressive strength, bonding property and strength; it can be seen from the performance test results of Comparative Example 2 that sulfoaluminate cement can accelerate the setting and hardening speed and improve the strength and volume stability of the repair material; it can be seen from the performance test results of Comparative Example 3 that ultrafine powder can adjust the setting time of the material and increase the fluidity of the material.

[0168] The rapid road repair material described in the present invention is an alkaline system, has good compatibility with cement and no corrosion to steel bars. It is non-toxic to the human body and has the property of non-combustion, is safe and environmentally friendly, and is convenient for storage and transportation. The construction process is simple to operate and can be used by adding water and stirring on site, the construction is convenient, and at the same time, the impact on traffic is reduced.

[0169] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made on the basis of the above description. It is impossible to enumerate all the implementation manners here. Any obvious changes or variations derived from the technical solutions of the present invention still fall within the protection scope of the present invention.

Claims

1. A rapid road repair material, characterized in that, By weight parts, it contains the following components: 28 - 34.5 parts of ultrafine portland cement, 6.0 - 11.6 parts of ultrafine powder, 10.5 - 14.5 parts of sulfoaluminate cement, 27.0 - 29.3 parts of coarse sand, 16.5 - 18.9 parts of fine sand, 0.01 - 0.05 parts of cellulose ether, 0.07 - 0.15 parts of expansive agent, 0.20 - 0.25 parts of water reducing agent, 0.08 - 0.12 parts of retarder, 0.02 - 0.06 parts of lithium carbonate, 0.10 - 0.15 parts of defoamer, 0.49 - 0.92 parts of redispersible latex powder; the redispersible latex powder is a copolymer of ethylene and vinyl acetate; The ultrafine powder is 700 - 900 mesh; the ultrafine powder consists of 19 - 21% by mass of slag powder, 9 - 11% by mass of first-class fly ash, 0.5 - 1.5% by mass of DC-C13 enhancer, 6 - 8% by mass of PⅠⅠ52.5R cement and 61 - 63% by mass of compound gypsum; the compound gypsum consists of 80% by mass of calcium sulfate and 20% by mass of hydrogen fluoride; The expansive agent is UEA expansive agent, the water reducing agent is polycarboxylate water reducing agent, the retarder is sodium citrate, the defoamer is polyether defoamer, and the redispersible latex powder is a copolymer of ethylene and vinyl acetate; The particle size of the coarse sand is 0.125 - 0.25 mm, and the particle size of the fine sand is 0.075 mm - 0.1 mm; It includes the following steps: (1) Stir the ultrafine portland cement, sulfoaluminate cement, coarse sand, fine sand and ultrafine powder at a rate of 90 - 110 r / min for 3 - 5 min, and mix evenly to obtain component A; (2) Stir the cellulose ether, expansive agent, polycarboxylate water reducing agent, retarder, polyether defoamer, redispersible latex powder and lithium carbonate at a rate of 110 - 130 r / min for 3 - 5 min to mix, and obtain component B; (3) Stir component A and component B at a rate of 90 - 110 r / min for 30 - 35 min, mix evenly, and package and seal in a three-layer compound film self-sealing bag to obtain the road rapid repair material; The stirring equipment required for the stirring in step (1) includes a stirring tank (1), a stirring shaft (2), an air charging tank (5) and a blower (6). The stirring shaft (2) is arranged in the stirring tank. The air outlet (4) of the air charging tank (5) is communicated with the lower part of the stirring tank (1), and the air inlet (3) of the air charging tank is connected to the blower (6). Turn on the blower (6) to make the materials suspended and fully homogenized in the stirring tank (1).

2. The rapid road repair material according to claim 1, characterized in that, By weight parts, the ultrafine portland cement is 31 - 33 parts, the ultrafine powder is 7.0 - 9.0 parts, the sulfoaluminate cement is 11.5 - 13.0 parts, the coarse sand is 28.0 - 29.1 parts, the fine sand is 17.9 - 18.5 parts, the cellulose ether is 0.02 - 0.04 parts, the expansive agent is 0.08 - 0.10 parts, the water reducing agent is 0.21 - 0.23 parts, the retarder is 0.9 - 0.11 parts, the lithium carbonate is 0.03 - 0.05 parts, the defoamer is 0.11 - 0.13 parts, and the redispersible latex powder is 0.6 - 0.8 parts.

3. A rapid road repair material according to claim 1, characterized in that, The average particle size of the ultra-fine portland cement is D50 = 4 µm and D95 = 10 µm; the specific surface area is 1150 - 1250 m 2 / kg.

4. A rapid road repair material according to claim 1, characterized in that The strength grade of the ultrafine portland cement is ≥75 MPa, and the strength grade of the sulfoaluminate cement is ≥42.5 MPa.

5. Use of a rapid road repair material according to any one of claims 1 to 4, characterized in that The rapid repair material is used for road repair.

Images