Road repairing mortar as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of concrete member repairing mortar, and particularly relates to road repairing mortar as well as a preparation method and application thereof. The road repairing mortar is prepared from the following raw materials in parts by mass: 900 to 1000 parts of cement, 7 to 9 parts of a water reducing agent, 880 to 1000 parts of fine sand, 17 to 19 parts of a macromolecular binder, 8 to 9 parts of organic silicon and 200 to 240 parts of water. The road repairing mortar has the beneficial effects that the road repairing mortar has relatively high early bonding strength, high breaking strength and high bonding strength can be achieved within 4 hours, the effects of shortening the damage repairing time of a road surface and a dam surface and quickly recovering the normal service state of a concrete structure are remarkable, and the maintenance cost of a project is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete component repair mortar, and in particular relates to road repair mortar and a preparation method and application thereof. Background Art

[0002] With the rapid development of my country's transportation industry and water conservancy and hydropower industry, concrete has become an important building material for building roads and hydropower station dams. However, concrete materials are prone to cracking in the natural environment for a long time, which seriously affects the safety of the structure. At present, most domestic rapid repair materials always have some defects that affect the repair effect. For example, the setting time of the repair mortar material is short, which causes the repair material to harden during transportation, seriously affecting the construction progress; in addition, the bonding performance of the repair material is poor in actual application, which easily causes the repair mortar to separate from the old concrete, and easily causes problems such as "peeling", resulting in secondary damage to the repaired part, resulting in a doubling of the cost of repairing cracks in the concrete structure. Summary of the invention

[0003] The present application provides a road repair mortar and a preparation method and application thereof, aiming to solve the problems of poor bonding performance of existing road repair mortar, easy separation from old concrete, and peeling.

[0004] The first aspect of the present application provides a road repair mortar, comprising the following raw materials in parts by weight: 900-1000 parts of cement, 7-9 parts of water reducer, 880-1000 parts of fine sand, 17-19 parts of polymer binder, 8-9 parts of silicone and 200-240 parts of water.

[0005] According to some embodiments of the road repair mortar described in the present application, the mortar includes the following raw materials in parts by weight: 920-980 parts of cement, 7-8 parts of water reducer, 900-980 parts of fine sand, 17-18 parts of polymer binder, 8-9 parts of silicone and 200-220 parts of water.

[0006] According to some embodiments of the road repair mortar described in the present application, the cement includes sulphoaluminate cement.

[0007] According to some embodiments of the road repair mortar described in the present application, the fine sand includes limestone sand; and the fineness modulus of the fine sand is 2.5-2.9.

[0008] According to some embodiments of the road repair mortar described in the present application, the water reducer includes a polycarboxylic acid high-efficiency water reducer and / or a naphthalene-based high-efficiency water reducer.

[0009] According to some embodiments of the road repair mortar described in the present application, the polymer binder includes one or more of ethylene-vinyl acetate copolymer, vinyl acetate-versatate copolymer and styrene-butadiene copolymer.

[0010] According to some embodiments of the road repair mortar described in the present application, the silicone includes lipophilic modified nano-silica and / or hydrophilic nano-silica.

[0011] According to some embodiments of the road repair mortar described in the present application, the particle size of the lipophilic modified nano-silica is 20 - 40 nm, and the specific surface area of the lipophilic modified nano-silica is 150 - 200 m 2 / g.

[0012] The second aspect of the present application provides a preparation method of the road repair mortar described in the first aspect of the present application, including the following steps:

[0013] (1) Mix cement, water reducer, fine sand, polymer binder and silicone to obtain a mixed powder;

[0014] (2) Mix the mixed powder and water to obtain the road repair mortar.

[0015] According to some embodiments of the preparation method of the road repair mortar described in the present application, in step (1), the rotation speed of the mixing is 500 - 1000 r / min, and the mixing time is 20 - 30 min.

[0016] The third aspect of the present application provides an application of the road repair mortar described in the first aspect of the present application or the road repair mortar obtained by the preparation method described in the second aspect of the present application in repairing cement concrete roads and cracks on the overflow surface of dams.

[0017] The beneficial effects of the present application include: The road repair mortar described in the present application has a relatively high early bonding strength, and can reach high flexural strength and high bonding strength in 4 h, which has a significant effect on shortening the repair time of road surface and dam surface damage and quickly restoring the normal service state of concrete structures, and reduces the maintenance cost of the project. Detailed Embodiments

[0018] The embodiments of the present invention are described in detail below. The examples of the embodiments are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0019] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0020] The embodiment of the present application provides a road repair mortar, comprising the following raw materials in parts by weight: 900-1000 parts of cement, 7-9 parts of water reducer, 880-1000 parts of fine sand, 17-19 parts of polymer binder, 8-9 parts of silicone and 200-240 parts of water.

[0021] The road repair mortar described in the present application has high early bonding strength and can reach high flexural strength and high bonding strength in 4 hours. It is effective in shortening the repair time of road and dam surface damage and quickly restoring the normal service state of concrete structures, thereby reducing the maintenance cost of the project.

[0022] In some embodiments of the present application, the following raw materials are included in parts by weight: 920-980 parts of cement, 7-8 parts of water reducer, 900-980 parts of fine sand, 17-18 parts of polymer binder, 8-9 parts of silicone and 200-220 parts of water.

[0023] In some embodiments of the present application, the cement includes sulphoaluminate cement.

[0024] In some embodiments of the present application, the fine sand includes limestone sand; the fineness modulus of the fine sand is 2.5-2.9, for example, 2.5, 2.6, 2.7, 2.8, 2.9, etc.

[0025] In some embodiments of the present application, the water reducer includes a polycarboxylic acid high-efficiency water reducer and / or a naphthalene-based high-efficiency water reducer. The polycarboxylic acid high-efficiency water reducer described in the present application was purchased from Jiangsu Subote New Materials Co., Ltd.

[0026] In some embodiments of the present application, the polymer binder includes one or more of ethylene-vinyl acetate copolymer, vinyl acetate-versatate vinyl copolymer and styrene-butadiene copolymer. The ethylene-vinyl acetate copolymer described in the present application was purchased from Shijiazhuang Longrui Building Materials Co., Ltd.

[0027] In some embodiments of the present application, the organosilicon includes lipophilic modified nano-silica and / or hydrophilic nano-silica. The lipophilic modified nano-silica described in the present application was purchased from Hubei Huifu Nanomaterial Co., Ltd.

[0028] In some embodiments of the present application, the particle size of the lipophilic modified nano-silica is 20-40 nm, such as 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, etc., and the specific surface area of ​​the lipophilic modified nano-silica is 150-200 m 2 / g, for example 150m 2 / g, 160m 2 / g, 180m 2 / g, 200m 2 / g, etc.

[0029] The present application also provides a method for preparing the road repair mortar according to the first aspect of the present application, comprising the following steps:

[0030] (1) Mixing cement, water reducing agent, fine sand, polymer binder and organosilicon to obtain mixed powder;

[0031] (2) Mixing the mixed powder and water to obtain the road repair mortar.

[0032] In some embodiments of the present application, in step (1), the mixing rotation speed is 500-1000r / min, for example, 500r / min, 700r / min, 800r / min, 900r / min, 1000r / min, etc., and the mixing time is 20-30min, for example, 20min, 25min, 28min, 30min, etc.

[0033] An embodiment of the present application also provides an application of the road repair mortar described in the first aspect of the present application or the road repair mortar obtained by the preparation method described in the second aspect of the present application in repairing cracks in cement concrete pavements and dam overflow surfaces.

[0034] The technical solution of the present application will be further described below in conjunction with specific embodiments.

[0035] Example 1

[0036] A road repair mortar comprises the following raw materials in parts by weight: 900 parts of sulphoaluminate cement, 8.2 parts of polycarboxylate high-efficiency water reducing agent, 880 parts of limestone sand with a fineness modulus of 2.8, 18.2 parts of ethylene-vinyl acetate copolymer, a particle size of 20 nm and a specific surface area of ​​160 m 2 8 parts of lipophilic modified nano-silica / g and 236 parts of water.

[0037] The method for preparing the road repair mortar described in Example 1 comprises the following steps:

[0038] (1) mixing cement, water reducing agent, fine sand, polymer binder and silicone at a stirring speed of 600 r / min for 20 min to obtain a mixture;

[0039] (2) Add water to the mixture and stir thoroughly for 20 seconds to obtain the polymer mortar quick repair material.

[0040] Example 2

[0041] The road repair mortar described in Example 2 is different from that in Example 1 only in that the mass content of the raw materials is different.

[0042] The specific steps include:

[0043] A road repair mortar comprises the following raw materials in parts by weight: 980 parts of sulphoaluminate cement, 9 parts of polycarboxylate high-efficiency water reducing agent, 1000 parts of limestone sand with a fineness modulus of 2.8, 18.8 parts of ethylene-vinyl acetate copolymer, with a particle size of 20 nm and a specific surface area of ​​160 m 2 / g 8.9 parts of lipophilic modified nano-silica and 239 parts of water.

[0044] The method for preparing the road repair mortar described in Example 2 comprises the following steps:

[0045] (1) mixing cement, water reducing agent, fine sand, polymer binder and silicone at a stirring speed of 600 r / min for 20 min to obtain a mixture;

[0046] (2) Add water to the mixture and stir thoroughly for 20 seconds to obtain the polymer mortar quick repair material.

[0047] Example 3

[0048] The road repair mortar described in Example 3 is different from that in Example 1 only in that the mass content of the raw materials is different.

[0049] The specific steps include:

[0050] A road repair mortar comprises the following raw materials in parts by weight: 980 parts of sulphoaluminate cement, 7.2 parts of polycarboxylate high-efficiency water reducing agent, 900 parts of limestone sand with a fineness modulus of 2.8, 17.9 parts of ethylene-vinyl acetate copolymer, a particle size of 20 nm and a specific surface area of ​​160 m 2 / g 8.1 parts of lipophilic modified nano-silica and 237 parts of water.

[0051] The method for preparing the road repair mortar described in Example 3 comprises the following steps:

[0052] (1) mixing cement, water reducing agent, fine sand, polymer binder and silicone at a stirring speed of 600 r / min for 20 min to obtain a mixture;

[0053] (2) Add water to the mixture and stir thoroughly for 20 seconds to obtain the polymer mortar quick repair material.

[0054] Comparative Example 1

[0055] The only difference between Comparative Example 1 and Example 1 is that the road repair mortar preparation process described in Comparative Example 1 does not contain raw material silicone.

[0056] The specific steps include:

[0057] A road repair mortar comprises the following raw materials in parts by weight: 900 parts of sulphoaluminate cement, 8.2 parts of polycarboxylic acid high-efficiency water reducing agent, 880 parts of limestone sand with a fineness modulus of 2.8, 18.2 parts of ethylene-vinyl acetate copolymer, and 236 parts of water.

[0058] The method for preparing the road repair mortar described in Comparative Example 1 comprises the following steps:

[0059] (1) mixing cement, water reducing agent, fine sand and polymer binder at a stirring speed of 600 r / min for 20 min to obtain a mixture;

[0060] (2) Add water to the mixture and stir thoroughly for 20 seconds to obtain the polymer mortar quick repair material.

[0061] Comparative Example 2

[0062] The only difference between Comparative Example 2 and Example 1 is that the road repair mortar preparation process described in Comparative Example 2 does not contain a raw material polymer binder.

[0063] The specific steps include:

[0064] A road repair mortar comprises the following raw materials in parts by weight: 900 parts of sulphoaluminate cement, 8.2 parts of polycarboxylate high-efficiency water reducing agent, 880 parts of limestone sand with a fineness modulus of 2.8, a particle size of 20 nm, a specific surface area of ​​160 m 2 8 parts of lipophilic modified nano-silica / g and 236 parts of water.

[0065] The method for preparing the road repair mortar described in Comparative Example 2 comprises the following steps:

[0066] (1) mixing cement, water reducing agent, fine sand and organosilicon at a stirring speed of 600 r / min for 20 min to obtain a mixture;

[0067] (2) Add water to the mixture and stir thoroughly for 20 seconds to obtain the polymer mortar quick repair material.

[0068] Comparative Example 3

[0069] The only difference between Comparative Example 3 and Example 1 is that the amount of silicone used in the preparation process of the road repair mortar in Comparative Example 3 is different from that in Example 1.

[0070] Specific operations include:

[0071] A road repair mortar comprises the following raw materials in parts by weight: 900 parts of sulphoaluminate cement, 8.2 parts of polycarboxylate high-efficiency water reducing agent, 880 parts of limestone sand with a fineness modulus of 2.8, 18.2 parts of ethylene-vinyl acetate copolymer, a particle size of 20 nm and a specific surface area of ​​160 m 2 / g lipophilic modified nano silicon dioxide 11 parts, water 236 parts.

[0072] The preparation method of the road repair mortar described in Comparative Example 3 comprises the following steps:

[0073] (1) mixing cement, water reducing agent, fine sand, polymer binder and silicone at a stirring speed of 600 r / min for 20 min to obtain a mixture;

[0074] (2) Add water to the mixture and stir thoroughly for 20 seconds to obtain the polymer mortar quick repair material.

[0075] Comparative Example 4

[0076] The difference between Comparative Example 4 and Example 1 is that ordinary cement raw material is used instead of sulphoaluminate cement in the preparation process of the road repair mortar described in Comparative Example 4.

[0077] Study on the performance of the road repair mortar described in Examples 1-3 and Comparative Examples 1-4 of the present application

[0078] The performance of the road repair mortars described in Examples 1-3 and Comparative Examples 1-4 of the present application was tested using DL / T5126-2021 "Test Procedure for Polymer Modified Cement Mortar". The indicators of the road repair mortars described in each example and comparative example at 4 hours and 1 day are shown in Table 1 and Table 2, respectively:

[0079] Table 1

[0080]

[0081]

[0082] Table 2

[0083]

[0084] It can be seen from Table 1 and Table 2 that the polymer rapid mortar repair material prepared in the embodiment of the present invention has excellent early mechanical properties. The mortar ratios of Examples 1, 2, and 3 are slightly different, but all show excellent early mechanical properties, indicating that a small adjustment of the ratio within the ratio range of the polymer rapid mortar repair material does not affect the actual use effect, and the accuracy of the mortar preparation on site is not required, which is convenient for technicians to implement on site.

[0085] By comparing Example 1 and Comparative Example 1, it can be seen that the addition of silicone can greatly improve the early mechanical properties. Taking the bonding strength as an example, the increase ratio in 4h exceeds 40%, indicating that the contribution of silicone is significant.

[0086] By comparing Example 1 and Comparative Example 2, it can be seen that the addition of the polymer binder has two effects. On the one hand, it can greatly improve the early mechanical properties, and on the other hand, it can prolong the setting time of the mortar. The setting time of the mortar with the addition of the polymer binder is increased from 11 minutes to 19 minutes, thereby ensuring that there is enough time on site to repair cracks, and there will be no problem of being unable to construct on site or having poor construction results due to the mortar hardening too quickly, which shows that the contribution of the polymer binder is significant.

[0087] By comparing Example 1 and Comparative Example 3, it can be seen that although excessive addition of silicone can greatly improve the early mechanical properties, it will cause the mortar setting time to be greatly shortened and cannot meet the on-site construction requirements, indicating that excessive addition of silicone is not conducive to the mortar to fully exert its workability and has poor working performance.

[0088] By comparing Example 1 and Comparative Example 4, it can be seen that the addition of ordinary cement greatly reduces the early mechanical properties of the mortar, and cannot meet the requirements of rapid on-site construction, indicating that the addition of sulphoaluminate cement is conducive to the mortar to fully exert the advantages of strong early mechanical properties.

[0089] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A road repair mortar, characterized in that: The invention comprises the following raw materials in parts by weight: 900-1000 parts of cement, 7-9 parts of water reducing agent, 880-1000 parts of fine sand, 17-19 parts of polymer binder, 8-9 parts of organic silicon and 200-240 parts of water.

2. The road repair mortar according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 920-980 parts of cement, 7-8 parts of water reducing agent, 900-980 parts of fine sand, 17-18 parts of polymer binder, 8-9 parts of organic silicon and 200-220 parts of water.

3. The road repair mortar according to claim 1, characterized in that: The cement comprises sulphoaluminate cement.

4. The road repair mortar according to claim 1, characterized in that: The fine sand includes limestone sand; the fineness modulus of the fine sand is 2.5-2.

9.

5. The road repair mortar according to claim 1, characterized in that: The water reducer includes a polycarboxylic acid high-efficiency water reducer and / or a naphthalene-based high-efficiency water reducer.

6. The road repair mortar according to claim 1, characterized in that: The polymer binder includes one or more of ethylene-vinyl acetate copolymer, vinyl acetate-versatate vinyl copolymer and styrene-butadiene copolymer.

7. The road repair mortar according to claim 1, characterized in that: The organosilicon includes lipophilic modified nano-silica and / or hydrophilic nano-silica; The particle size of the lipophilic modified nano-silicon dioxide is 20-40 nm, and the specific surface area of ​​the lipophilic modified nano-silicon dioxide is 150-200 m 2 / g.

8. The method for preparing the road repair mortar according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Mixing cement, water reducing agent, fine sand, polymer binder and organosilicon to obtain mixed powder; (2) Mixing the mixed powder and water to obtain the road repair mortar.

9. The method for preparing road repair mortar according to claim 8, characterized in that: In step (1), the mixing speed is 500-1000 r / min, and the mixing time is 20-30 min.

10. Use of the road repair mortar according to any one of claims 1 to 7 or the road repair mortar obtained by the preparation method according to any one of claims 8 to 9 in repairing cracks in cement concrete pavements and dam overflow surfaces.

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