Building plastering mortar suitable for robot and preparation method thereof

Abstract

The invention discloses building plastering mortar suitable for a robot and a preparation method of the building plastering mortar, and aims to solve the problems of insufficient pumpability, poor flowability and high cost of traditional mortar. The mortar is prepared from cement, sand, construction waste powder, fly ash, desulfurized gypsum powder, a dispersing agent, an air entraining agent and an anti-cracking agent according to a specific proportion. The construction waste powder is crushed and screened, the particle size is smaller than or equal to 5 mm, solid waste is effectively utilized, and the cost is reduced. The dispersing agent and the air entraining agent improve the fluidity and pumpability of the mortar, and the problem that discharging is not uniform in the robot plastering process is solved. The anti-cracking agent can prevent cracks and improve the strength of the mortar. The preparation method comprises the following steps: crushing and screening the construction waste, screening sand, mixing the raw materials in proportion, and grinding for 20-30 minutes. The mortar has the advantages of being environmentally friendly, low in cost, good in fluidity, high in crack resistance and the like, is suitable for robot plastering construction, improves the efficiency and reduces the labor intensity of workers.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, in particular to a building plaster mortar suitable for robots. Background Art

[0002] With the continuous improvement of building materials and construction technology, traditional building materials can no longer meet the needs of modern construction, especially traditional mortars are mostly prepared on-site, which inevitably causes harm to the on-site construction environment and cannot meet the needs of building energy conservation. Therefore, many cities are gradually banning on-site mixing of mortar and promoting the use of premixed mortar, which has the advantages of health and environmental protection, stable quality, energy saving and comfort.

[0003] Wall plastering refers to the application of cement mortar, mixed mortar, and lime mortar on the wall surface. Indoor and outdoor wall plastering is a work that is done after the completion of the building structure construction. Scientific plastering work can play the role of moisture-proof, weathering-proof, and heat-insulating, and prevent the building walls from being eroded by wind, rain, snow, etc. The existing wall mortar scraping is mostly done manually, which is labor-intensive, time-consuming and labor-intensive. From the perspective of construction period, it accounts for about 30% to 40% of the total construction period. Therefore, plastering mortar has a greater impact on construction costs and construction periods. Using robots for plastering work can reduce a lot of manual labor and save construction time. However, the mortar used for manual plastering is not pumpable enough, and it is difficult to meet the fluidity required for robot plastering, resulting in uneven discharge during transportation and poor construction effect. In addition, the cost of plastering mortar is high and it is difficult to adapt to market demand. Summary of the invention

[0004] In view of the above situation, in order to remedy the above-mentioned existing defects, the present invention provides a building plastering mortar suitable for robots, which is used to solve the problem that the existing mortar is insufficiently pumpable and difficult to meet the fluidity required for robot plastering, resulting in uneven material discharge and excessively high costs during the plastering process.

[0005] The present invention provides the following technical invention: The present invention provides a building plaster mortar suitable for robots, and the raw material composition by weight percentage is as follows:

[0006] 20-30% cement, 20-40% sand, 20%-30% construction waste powder, 5-20% fly ash, 8-9% desulfurized gypsum powder, 0.3-0.8% dispersant, 0.2-0.5% air entraining agent, 0.1-0.5% anti-cracking agent, the total weight percentage of the above components is 100%.

[0007] Furthermore, the construction waste powder is mortar powder produced by crushing and separating waste gas concrete and discarded bricks, and the particle size of the construction waste powder is ≤5mm.

[0008] Furthermore, the dispersant is a melamine formaldehyde condensate, which has a good dispersing effect and can improve the fluidity and pumpability of cement mortar. Its main function is to reduce the friction between cement particles so that the cement mortar can be evenly dispersed during the mixing and grinding process to form a slurry with fine texture and moderate consistency.

[0009] Furthermore, the air entraining agent is rosin resin, alkyl and alkyl aromatic sulfonic acid, fatty alcohol sulfonate, saponin, protein salt, petroleum sulfonic acid. The air entraining agent is also called air-entraining agent, which is a hydrophobic surfactant. After being dissolved in water, it is added to the concrete mixture. A large number of tiny bubbles can be generated during the mixing process, which can improve the fluidity, cohesion and water retention of the concrete mixture, reduce the uneven discharge that may occur during the robot plastering process, and can also improve the frost resistance.

[0010] Furthermore, the anti-cracking agent is polypropylene fiber, which prevents and reduces the generation of cracks and significantly improves the strength of cement mortar and concrete.

[0011] Furthermore, the method for preparing building plaster mortar suitable for robots comprises the following steps:

[0012] Step 1: crushing, screening and secondary crushing of waste gas concrete and waste bricks to separate aggregate and mortar, and the particle size of separated mortar is ≤5mm;

[0013] Step 2: Use a screening tool to screen out fine sand for construction with a fineness modulus of 0.9-1.5, and weigh the required weight of sand after screening;

[0014] Step three, weigh cement, fly ash, desulfurized gypsum powder, dispersant, air entraining agent, and anti-cracking agent according to the proportion, introduce them into a dry mortar mixer with the construction waste powder prepared in step one and the sand sieved out in step two, mix them evenly, and then grind them for 20-30 minutes to obtain the building plaster mortar suitable for robots.

[0015] The present invention proposes a building plastering mortar suitable for robots. The beneficial effects achieved by the present invention by adopting the above scheme are as follows:

[0016] 1) The use of construction waste powder not only handles the increasing solid waste, but also reduces the use of other fine aggregates, saving construction costs;

[0017] 2) Fly ash is the main solid waste discharged from coal-fired power plants. Using fly ash can effectively utilize solid waste and avoid stratification, water seepage and clogging of delivery pipelines during concrete construction. It can also replace part of cement and save costs. In addition, fly ash particles are spherical and have a ball effect, which plays a lubricating role and can improve the fluidity, cohesion and water retention of concrete mixtures, thereby improving pumpability.

[0018] 3) Use air-entraining agent as a pumping agent to improve the fluidity, cohesion and water retention of concrete mixture, reduce the possibility of pipe blockage of plastering robots, improve work efficiency and save construction time. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technology in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] Example 1

[0021] A building plaster mortar suitable for robots, the raw materials are composed as follows in weight percentage:

[0022] 20% cement, 30% sand, 22.5% construction waste powder, 18% fly ash, 8% desulfurized gypsum powder, 0.5% dispersant, 0.5% air entraining agent, 0.5% anti-cracking agent, the total weight percentage of the above components is 100%.

[0023] Among them, construction waste powder is mortar powder produced by crushing and separating waste concrete and waste bricks, and the particle size of construction waste powder is ≤5mm; air entraining agent is alkyl and alkyl aromatic sulfonic acid, which is dissolved in water and added to the concrete mixture. During the mixing process, a large number of tiny bubbles can be generated, which can improve the fluidity, cohesion and water retention of the concrete mixture, reduce the uneven discharge that may occur during the robot plastering process, and improve the frost resistance;

[0024] The anti-cracking agent is polypropylene fiber, which prevents and reduces the occurrence of cracks and significantly improves the strength of cement mortar and concrete. An appropriate amount of desulfurized gypsum powder can significantly improve the compressive strength of concrete, improve early strength, reduce the impact of fly ash on the weak early strength of mortar, and improve durability.

[0025] This embodiment also provides a method for preparing building plaster mortar suitable for a robot, comprising the following steps:

[0026] 1) Crushing, screening and secondary crushing of waste gas concrete and waste bricks to separate aggregate and mortar, and the particle size of separated mortar is ≤5mm;

[0027] 2) Use a screening tool to sieve out fine sand for construction with a fineness modulus of 1.2, and weigh the required weight of sand after screening;

[0028] 3) Cement, fly ash, desulfurized gypsum powder, dispersant, air entraining agent and anti-cracking agent are weighed according to the proportion, introduced into a dry mortar mixer with the construction waste powder prepared in step 1 and the sand sieved out in step 2, mixed evenly, and then ground for 20-30 minutes to obtain a building plaster mortar suitable for robots.

[0029] Example 2

[0030] A building plaster mortar suitable for robots, the raw materials are composed as follows in weight percentage:

[0031] 22% cement, 28% sand, 22.7% construction waste powder, 17% fly ash, 9% desulfurized gypsum powder, 0.4% dispersant, 0.4% air entraining agent, 0.5% anti-cracking agent, the total weight percentage of the above components is 100%.

[0032] Among them, construction waste powder is mortar powder produced by crushing and separating waste concrete and waste bricks, and the particle size of construction waste powder is ≤5mm; air entraining agent is alkyl and alkyl aromatic sulfonic acid, which is dissolved in water and added to the concrete mixture. During the mixing process, a large number of tiny bubbles can be generated, which can improve the fluidity, cohesion and water retention of the concrete mixture, reduce the uneven discharge that may occur during the robot plastering process, and improve the frost resistance;

[0033] The anti-cracking agent is polypropylene fiber, which prevents and reduces the occurrence of cracks and significantly improves the strength of cement mortar and concrete;

[0034] An appropriate amount of desulfurized gypsum powder can significantly increase the compressive strength of concrete, improve early strength, reduce the influence of fly ash on weak early strength, and improve durability.

[0035] This embodiment also provides a method for preparing building plaster mortar suitable for a robot, comprising the following steps:

[0036] 1) Crushing, screening and secondary crushing of waste gas concrete and waste bricks to separate aggregate and mortar, and the particle size of separated mortar is ≤5mm;

[0037] 2) Use a screening tool to sieve out fine sand for construction with a fineness modulus of 0.9, and weigh the required weight of sand after screening;

[0038] 3) Cement, fly ash, desulfurized gypsum powder, dispersant, air entraining agent and anti-cracking agent are weighed according to the proportion, introduced into a dry mortar mixer with the construction waste powder prepared in step 1 and the sand sieved out in step 2, mixed evenly, and then ground for 20-30 minutes to obtain a building plaster mortar suitable for robots.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, material or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, material or apparatus.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A building plastering mortar suitable for robots, characterized in that: The raw material composition by weight percentage is as follows: 20-30% cement, 20-40% sand, 20%-30% construction waste powder, 5-20% fly ash, 8-9% desulfurized gypsum powder, 0.3-0.8% dispersant, 0.2-0.5% air entraining agent, 0.1-0.5% anti-cracking agent, the total weight percentage of the above components is 100%.

2. The building plaster mortar suitable for robots according to claim 1, characterized in that: The construction waste powder is mortar powder produced by crushing and separating waste gas concrete and discarded bricks, and the particle size of the construction waste powder is ≤5mm.

3. The building plaster mortar suitable for robots according to claim 1, characterized in that: The dispersant is a melamine formaldehyde condensate, which has a good dispersing effect and can improve the fluidity and pumpability of cement mortar. Its main function is to reduce the friction between cement particles so that the cement mortar can be evenly dispersed during the mixing and grinding process to form a slurry with a fine texture and moderate consistency.

4. The building plaster mortar suitable for robots according to claim 1, characterized in that: The air entraining agent is rosin resin, alkyl and alkyl aromatic sulfonic acid, fatty alcohol sulfonate, saponin, protein salt, petroleum sulfonic acid. The air entraining agent is also called air-entraining agent, which is a hydrophobic surfactant. After being dissolved in water, it is added to the concrete mixture. A large number of tiny bubbles can be generated during the mixing process, which can improve the fluidity, cohesion and water retention of the concrete mixture, reduce the uneven discharge that may be caused during the robot plastering process, and can also improve the frost resistance.

5. The building plaster mortar suitable for robots according to claim 1, characterized in that: The anti-cracking agent is polypropylene fiber, which prevents and reduces the generation of cracks and significantly improves the strength of cement mortar and concrete.

6. A method for preparing building plaster mortar suitable for robots according to any one of claims 1 to 5, comprising the following steps: Step 1: crush, screen and re-crush the waste gas concrete and waste bricks to separate the aggregate and mortar, and the particle size of the separated mortar is ≤5mm; Step 2: Use a screening tool to screen out fine sand for construction with a fineness modulus of 0.9-1.5, and weigh the required weight of sand after screening; Step 3: Weigh cement, fly ash, desulfurized gypsum powder, dispersant, air entraining agent, and anti-cracking agent according to the proportion, introduce them into a dry mortar mixer with the construction waste powder prepared in step 1 and the sand sieved out in step 2, mix them evenly, and then grind them for 20-30 minutes to obtain the building plaster mortar suitable for robots.