Wall-based polymer cement mortar thin-layer plastering construction method

Abstract

The invention provides a polymer cement mortar thin-layer plastering construction method based on a wall body, and belongs to the field of building engineering construction.The polymer cement mortar thin-layer plastering construction method based on the wall body comprises the steps that a tongue-and-groove is reserved, specifically, a plastering tongue-and-groove is reserved in the wall face of the joint of the concrete wall body and a masonry wall; the surface of the concrete wall body and the surface of the masonry wall are subjected to cleaning, filling and plugging treatment; steel wire meshes are hung, specifically, the steel wire meshes are hung at the connecting positions of the plastering rabbets and the masonry walls and at the positions where wall body pipelines are buried; the plastering rabbet with the width of 100 mm and the thickness of 10-20 mm is reserved at the joint of the concrete wall and the masonry wall, and the galvanized steel wire mesh and the alkali-resistant glass fiber gridding cloth are hung in a matched mode, so that the structure at the joint of different materials is reinforced, shrinkage stress caused by material differences is effectively relieved through the multiple anti-cracking design, the cracking rate and the hollowing rate of the plastering wall are greatly reduced, and the construction quality of the plastering wall is improved. Hollowing and cracking are effectively controlled, and the engineering quality is improved.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically relating to a method for thin-layer plastering of polymer cement mortar based on walls. Background Technology

[0002] With the continuous improvement of the level of industrialization in the construction industry and the increasingly stringent requirements for green construction, quality control of wall plastering projects has become a key aspect of building construction.

[0003] In current interior wall plastering construction, the traditional ordinary cement mortar plastering process is mostly used. However, this process has the following significant drawbacks in practical applications: 1. Prominent quality defects: Due to its high shrinkage, ordinary cement mortar is prone to cracking and hollowing at the interface between different materials (such as concrete walls and masonry walls), resulting in high maintenance costs later; 2. Long construction cycle: Traditional processes require multiple wet operations and long curing times, are greatly affected by the environment, and cannot meet the needs of modern engineering projects for rapid, intermittent construction; 3. Poor environmental performance: On-site mixing of mortar easily generates a large amount of dust pollution, and the water consumption during construction is high, which does not conform to the trend of green and low-carbon construction; 4. Poor appearance quality: Ordinary plastering has a rough surface and has limited effect on repairing minor defects such as air bubbles on concrete surfaces and formwork joints. Summary of the Invention

[0004] The purpose of this invention is to provide a method for thin-layer plastering of polymer cement mortar based on walls, which aims to solve the problems of prominent quality defects, long construction period, poor environmental performance and poor appearance quality in the existing technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for constructing a thin-layer plastering application of polymer cement mortar based on a wall, comprising the following steps: Tongue and groove reserved: A plastering tongue and groove is reserved on the wall surface at the junction of concrete wall and masonry wall; Surface preparation: Cleaning, filling, and sealing the surfaces of concrete and masonry walls; Hanging wire mesh: Hang wire mesh at the junction of plastering tongue and groove and masonry wall and at the location where pipes are buried in the wall; Cement mortar plastering of masonry walls: Apply a cement mortar plaster layer to the surface of the masonry wall, and smooth the plastering from the masonry wall towards the plastering joint. First layer of polymer cement mortar plastering: Apply an interface agent to the surface of the cement mortar plaster layer and the concrete wall surface, then apply the first layer of polymer cement mortar and press in the reinforcing mesh. Second layer of polymer cement mortar plastering: After the first layer of polymer cement mortar has hardened, apply the second layer of polymer cement mortar and smooth it. Detail processing: After the construction is completed, the flatness and verticality of the plaster are measured and the lime sand on the wall is cleaned.

[0006] As a method for thin-layer plastering of polymer cement mortar based on walls according to the present invention, preferably, the width of the plastering tongue and groove is 100mm and the thickness is 10-20mm.

[0007] As a method for thin-layer plastering of polymer cement mortar based on walls according to the present invention, preferably, the substrate treatment step includes: Use 10% caustic soda solution to remove oil stains from the concrete surface and then roughen it. For internal wall bolt holes, double-sided grouting with base plaster mortar is used for sealing. For external wall bolt holes, cement cones are used for sealing followed by application of polyurethane waterproof coating.

[0008] As a construction method for thin-layer plastering of polymer cement mortar based on walls according to the present invention, preferably, the wire mesh is a galvanized wire mesh with a specification of φ0.5 (15mm×15mm), the hanging width is 300mm, and it is fixed in a quincunx pattern by connecting iron plates or nails, with a fixing interval of ≤500mm.

[0009] As a method for thin-layer plastering of polymer cement mortar based on walls according to the present invention, preferably, the cement mortar plastering step of the masonry wall surface includes: Three days before plastering, manually apply the plaster to create a rough surface, and allow it to cure for 3-4 days. Mortar spots and screeds were set using 1:2.5 cement mortar, with a spacing of 1.5m between screeds; Apply the base coat in layers. After the base coat has absorbed the water, compact it with a wooden trowel and roughen it with a sponge cloth. Spray curing should be carried out for no less than 7 days after plastering is completed, 24 hours later.

[0010] As a method for thin-layer plastering of polymer cement mortar based on walls according to the present invention, preferably, the reinforcing mesh is an alkali-resistant fiberglass mesh, which is set at the junction of the concrete wall and the plastering surface of the masonry wall. The mesh is 300mm wide and the overlap width with each substrate is not less than 150mm.

[0011] As a method for thin-layer plastering of polymer cement mortar based on walls according to the present invention, preferably, the thickness of the first layer of polymer cement mortar is 3mm and the thickness of the second layer of polymer cement mortar is 2mm.

[0012] As a construction method for thin-layer plastering of polymer cement mortar based on walls according to the present invention, preferably, the polymer cement mortar plastering adopts a dry troweling method, which does not require wetting or water curing during the construction process.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This method of applying polymer cement mortar thin-layer plastering to walls involves reserving a 100mm wide and 10-20mm thick plastering groove at the junction of concrete and masonry walls, and then installing galvanized steel wire mesh and alkali-resistant fiberglass mesh. This reinforces the structure at the junction of different materials. This multi-layer anti-cracking design effectively alleviates the shrinkage stress caused by material differences, greatly reduces the cracking rate and hollowness rate of the plastered walls, effectively controls hollowness and cracking, and improves the quality of the project.

[0014] 2. This method of applying polymer cement mortar thin-layer plastering to walls adopts a thin-layer plastering process with a total thickness of only about 5mm, which significantly reduces the amount of mortar used. At the same time, the polymer cement mortar adopts a dry application method, which does not require long-term water curing as traditional mortar, greatly speeding up the construction progress. Compared with traditional processes, it can save about 30 days of construction time, shorten the construction cycle, and improve work efficiency.

[0015] 3. This invention relates to a method for thin-layer plastering of polymer cement mortar based on walls. This method is a dry construction method, which greatly reduces the amount of water used on site. Furthermore, the method uses containers for mixing near the plastering area, which effectively controls dust pollution. In addition, thin-layer plastering reduces material waste. Combined with the extremely low maintenance rate in the later stages, it has significant economic, environmental and social benefits, while also reducing construction costs.

[0016] 4. This is a thin-layer plastering construction method based on polymer cement mortar for walls. The polymer cement mortar has excellent bonding performance and water retention rate. By applying it in two layers and combining it with final setting and troweling treatment, it can perfectly repair defects such as air bubbles, pitting, and template joints on the wall surface, resulting in a smooth, clean, trowel-free, and color-different surface. It also makes the wall edges and lines clear and straight, improving the interior appearance.

[0017] 5. This method of applying a thin layer of polymer cement mortar plaster to walls is a dry-processing method that is beneficial for protecting finished products from overlapping processes. This process can be carried out during the plastering stage or before delivery, providing greater flexibility for subsequent processes such as floor and ceiling plastering. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a specific embodiment of the present invention.

[0019] In the diagram: 1. Concrete wall; 2. Masonry wall; 3. Plaster tongue and groove; 4. Wire mesh; 5. Cement mortar plaster layer; 6. Interface agent; 7. First layer of polymer cement mortar; 8. Reinforcing mesh; 9. Second layer of polymer cement mortar. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1 The present invention provides the following technical solution: a method for constructing a thin-layer plastering application of polymer cement mortar based on a wall, comprising the following steps: 1. Tongue and groove reserved: First, in the construction preparation stage, the aluminum formwork is designed in detail. At the junction of concrete wall 1 and masonry wall 2, a plastering tongue and groove 3 with a width of 100mm and a thickness of 10-20mm is reserved on the wall surface.

[0022] II. Grassroots Handling 1. The surface of concrete wall 1 needs to be cleaned with a wire brush to remove laitance, release agent, oil stains, and formwork residue. Exposed rebar ends should be cut off, and protruding concrete blocks should be chiseled out. All air bubbles in the concrete wall surface should be filled with plaster and the surface should be smoothed. The bolt holes in the interior wall should be sealed with double-sided grouting. The bolt holes in the exterior wall should be sealed with cement cones and then coated with polyurethane waterproof coating (100mm in diameter). 2. The surface of masonry wall 2 should be cleaned of dust, and laitance and protruding mortar blocks should be removed. 3. If the base concrete surface is very smooth, clean the smooth surface, remove oil stains with 10% caustic soda solution, rinse off the alkali solution, dry, and then roughen the surface.

[0023] 3. Hanging wire mesh To prevent cracking of the plaster layer at the junction of different materials, a 300mm thick φ0.5 (15 mm × 15 mm) galvanized steel wire mesh 4 is fully hung from the plaster tongue and groove 3 to the masonry position and the wall pipeline embedment location. It is fixed with adhesive connecting iron plates on the shear wall and fixed with nails on the masonry wall 2 in a quincunx pattern with a spacing of ≤500mm. The corners can be appropriately densified.

[0024] IV. Cement mortar plastering of masonry walls 1. Based on the floor control line diagram, set a continuous control baseline on the floor and ceiling of each room, and make clear markings and protection.

[0025] 2. Three days before plastering, apply P.O42.5 cement mortar to the masonry wall surface. Use a φ0.5 (15 mm × 15 mm) 400 mm × 400 mm rectangular wire mesh with a roughened texture, securing one end with a wooden stick. Apply the mortar manually to ensure sufficient roughness (8 mm). Mechanical spraying is strictly prohibited. Two hours before applying the mortar, moisten the wall surface with water, ensuring no standing water is visible. Apply the mortar vertically, evenly, and completely, without penetrating the surface, creating clearly visible, uniformly sized raised dots. After applying the mortar, allow it to cure for 3-4 days.

[0026] 3. Use 1:2.5 cement mortar to make 50mm x 50mm square mortar spots. The spacing between the top, bottom, left, and right sides should not exceed 1.5m. Mortar spots must be placed 200mm away from the edges of door and window openings and inside and outside corners. Special mortar can be used for construction of screeds. Screeds should be applied to the plastered wall surface at 1.5m intervals, and the thickness should be consistent with that of the mortar spots.

[0027] 4. After the mortar spots and screeds have gained strength, the base coat can be applied. The plastering should be done in layers. The total thickness should be consistent with the thickness of the screeds. Use a large straightedge to level and straighten the entire surface, then roughen it with a wooden trowel. When the base coat is 50-60% dry, or when it does not deform when pressed by hand, the top coat mortar can be applied. After plastering, use a straightedge to level it again. After the mortar has absorbed the water, compact it with a wooden trowel, and then roughen the details with a sponge cloth, thus forming a cement mortar plaster layer 5 on the surface of the masonry wall 2.

[0028] 5. After the cement mortar plastering is completed, spray the plastered surface with water for curing for no less than 7 days, once in the morning, noon and evening.

[0029] V. First application of polymer cement mortar plaster and mesh reinforcement 1. Apply a full coat of special interface agent 6 to the surface of the cement mortar plaster layer 5 and the concrete wall surface. The interface agent 6 fully penetrates into the base layer and seals any excess gaps.

[0030] 2. Apply the first layer of polymer cement mortar 7, 3mm thick, while simultaneously pressing in alkali-resistant fiberglass mesh reinforcement 8. The mesh is installed across the joint between the aluminum formwork concrete wall and the masonry plastered wall, with a mesh width of 300mm and an overlap width of no less than 150mm with each substrate. Before the crack-resistant mortar initially sets, use a wooden trowel to press and rub the wall surface to remove air from the mortar and the substrate, forming a rough, uniform surface that enhances adhesion and compaction, providing the best bonding layer for the subsequent plastering layer. Natural curing is allowed during this process; no watering is required.

[0031] VI. Second Polymer Cement Mortar Plastering After the first layer of polymer cement mortar 7 has hardened and gained a certain strength, apply the second layer of polymer cement mortar 9, 2mm thick. Use a trowel to thinly and completely cover the bottom layer of polymer cement mortar with the polymer cement mortar. When the mortar on the wall gradually loses its surface moisture, immediately finish the surface. The trowel should be cleaned, and even pressure should be applied using a cross-patterning method to smooth out all the trowel marks left by the first layer of polymer cement mortar 7, making the surface smooth and delicate. When the polymer cement mortar has finally set, gently press it to completely eliminate all trowel marks, making the surface smooth and bright with clear and straight edges and lines.

[0032] Polymer cement mortar thin-layer plastering uses a dry application method, eliminating the need for wetting and water curing, which is more beneficial for protecting finished products from overlapping processes. Mixing the plaster in containers near the plastering area is also more environmentally friendly. This process is simple to operate, can be applied during plastering or before delivery, facilitates the integration of other processes such as floor / ceiling plastering, offers greater flexibility in construction organization and deployment, and can significantly accelerate the construction progress.

[0033] VII. Detail Processing 1. After the cement mortar application is completed, on-site construction personnel should promptly measure the flatness and verticality of the plaster. Any problems found should be repaired immediately, using specialized tools to smooth out rough surfaces, protrusions, and error points, and then promptly water-curing should be carried out. After the polymer cement mortar application is completed, the overall flatness and verticality should be measured again to ensure the polymer plaster surface is flat, clean, free of trowel marks, and without color difference.

[0034] 2. When plastering, protective measures should be taken for the embedded parts, wire troughs, boxes, ventilation grates, and reserved holes on the wall to prevent mortar from leaking in or blocking them during construction. After the base coat is smoothed, a specialist should be assigned to scrape off the lime sand around the reserved holes, distribution boxes, troughs, and boxes within a 5cm width and clean it thoroughly to ensure that the reserved holes, distribution boxes, troughs, and boxes are square.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims and not by the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for applying a thin layer of polymer cement mortar plaster to a wall, characterized in that, Includes the following steps: Tongue and groove reserved: On the wall surface at the junction of concrete wall (1) and masonry wall (2), a plastering tongue and groove (3) is reserved. Base treatment: Clean, fill and seal the surfaces of concrete walls (1) and masonry walls (2); Hanging wire mesh: Hang wire mesh (4) at the junction of the plastering tongue and groove (3) and the masonry wall (2) and at the location where the wall pipeline is buried. Cement mortar plastering of masonry wall: Apply cement mortar plaster layer (5) to the surface of masonry wall (2), and the plastering is carried out from the masonry wall (2) to the plastering tongue and groove (3) and smoothed. First polymer cement mortar plastering: Apply interface agent (6) to the surface of cement mortar plastering layer (5) and concrete wall (1), then apply the first layer of polymer cement mortar (7) and press in the mesh reinforcement mesh (8); Second layer of polymer cement mortar plastering: After the first layer of polymer cement mortar (7) has hardened, apply the second layer of polymer cement mortar (9) and smooth it. Detail processing: After the construction is completed, the flatness and verticality of the plaster are measured and the lime sand on the wall is cleaned.

2. The method for constructing a thin-layer plastering application of polymer cement mortar based on a wall, as described in claim 1, is characterized in that: The width of the plaster tongue and groove (3) is 100mm and the thickness is 10-20mm.

3. The method for constructing a thin-layer plastering application of polymer cement mortar based on a wall, as described in claim 1, is characterized in that... The underlying processing steps include: Use 10% caustic soda solution to remove oil stains from the concrete surface and then roughen it. The bolt holes in the interior walls are sealed with double-sided grouting using a base layer of plaster mortar, while the bolt holes in the exterior walls are sealed with cement cones and then coated with polyurethane waterproof coating.

4. The method for constructing a thin-layer plastering method for polymer cement mortar based on walls according to claim 1, characterized in that: The wire mesh (4) is made of galvanized wire mesh with a specification of φ0.5 (15mm×15mm). Its hanging width is 300mm. It is fixed in a quincunx pattern by connecting iron plates or nails, with a fixing interval of ≤500mm.

5. The method for constructing a thin-layer plastering application of polymer cement mortar based on a wall, as described in claim 1, is characterized in that... The cement mortar plastering process for the masonry wall surface includes: Three days before plastering, manually apply the plaster to create a rough surface, and allow it to cure for 3-4 days. Mortar spots and screeds were set using 1:2.5 cement mortar, with a spacing of 1.5m between screeds; Apply the base coat in layers. After the base coat has absorbed the water, compact it with a wooden trowel and roughen it with a sponge cloth. Spray curing should be carried out for no less than 7 days after plastering is completed, 24 hours later.

6. The method for constructing a thin-layer plastering application of polymer cement mortar based on a wall, as described in claim 1, is characterized in that: The reinforcing mesh (8) is an alkali-resistant fiberglass mesh. The reinforcing mesh (8) is set at the junction of the concrete wall (1) and the plastered surface of the masonry wall (2). The width of the mesh is 300mm, and the overlap width with each substrate is not less than 150mm.

7. The method for constructing a thin-layer plastering application of polymer cement mortar based on a wall, as described in claim 1, is characterized in that: The thickness of the first layer of polymer cement mortar (7) is 3 mm, and the thickness of the second layer of polymer cement mortar (9) is 2 mm.

8. The method for constructing a thin-layer plastering application of polymer cement mortar based on a wall, as described in claim 1, is characterized in that: Polymer cement mortar plastering uses a dry application method, requiring no wetting or water curing during construction.

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