Quality assurance measures for wall painting projects

Quality assurance measures for wall painting projects

Technological measures for plastering cement mortar:

2 2 Construction preparation

2.1 Main materials and machines :

2.1.1 Cement: No. 325 and above slag cement or ordinary cement, with the same color, products of the same batch number should be used.

2.1.2 Sand: Medium sand with an average particle size of 0.35~0.5mm. The sand particles must be hard and clean, and must not contain harmful substances such as clay, grass roots, leaves, alkalis and other organic matter. Before use, the sand should be passed through sieves of different apertures according to the requirements of use, and sieved for later use.

2.1.3 Lime paste: It should be drenched with lumps of quicklime. The pore size of the sieve used during drenching should not be larger than 3mm×3mm and should be stored in the sedimentation tank. The curing time is generally not less than 15 days at room temperature; when used for covering ash, the curing time should not be less than 30 days. When used, the lime paste should not contain unripened particles and other impurities.

2.1.4 Finely ground quicklime powder: when the fineness exceeds 0.125mm, the cumulative sieve residue shall not exceed 13%. Soak in water to fully mature before use. The aging time should be no less than 3 days.

Soaking method: Prepare a large container in advance, evenly sprinkle a layer of quicklime powder into the container, pour a layer of water, then sprinkle a layer of quicklime powder, and then water, and so on. Until it reaches 2/3 of the volume of the container, then fill the container with water and soak all the quicklime powder in the water to allow it to mature.

2.1.5 Finely ground fly ash: a square hole sieve with a fineness of more than 0.08mm, and the sieve residue is not more than 5%. Fly ash can replace cement to mix mortar, and its maximum dosage is It should not be more than 25% of the cement content. If it is used to replace lime paste in the mortar, the maximum amount should not be more than 50%.

2.1.6 Other admixtures: 107 glue and admixtures, the amount of which should be determined through testing.

2.1.7 Main tools: mixer, sieves with 5mm and 2mm apertures, and large flat shovels. In addition to the tools commonly used by plasterers, soft brushes, wire brushes, chopsticks, pens, and powder Thread bag, watering can, small kettle, bucket, grid strips, broom, hammer, chisel, etc.

2.2 Operating conditions:

2.2.1 All structural projects have been completed and accepted by relevant departments to meet qualified standards.

2.2.2 Before plastering, check whether the door and window frames are in the correct position and whether they are firmly connected to the wall. The gaps at the joints should be filled in layers with 1:3 cement mortar or 1:1:6 cement mixed mortar. If the gap is large, a small amount of hemp knife should be added to the mortar to make the gap tight. Aluminum alloy door and window gaps should be filled according to design requirements.

2.2.3 Dust, dirt and oil stains on the surface of brick walls, concrete walls and aerated concrete walls should be cleaned and moistened with water.

2.2.4 Balcony railings, hanging iron parts, embedded iron parts, pipes, etc. should be installed in advance. During structural construction, the reserved holes on the wall should be blocked tightly in advance, and the columns and lintels should be After the concrete protruding from the wall is smoothed, the recessed areas should be brushed in advance and soaked with water. Then, 1:3 cement mortar or 1:1:6 cement mixed mortar should be used to level the surface in layers.

2.2.5 The joints of precast concrete exterior wall panels should be processed in advance, and the cavity should be checked to see if it is unobstructed, the seams should be hooked up, and a water spray test should be conducted. Only if there is no leakage can the next process be carried out.

2.2.6 Missing edges and corners on the surface of aerated concrete need to be repaired in layers. The method is: first wet the substrate surface, apply a layer of 107 cement slurry mixed with 10% water, and then apply 1:1:6 mixed mortar. The thickness of each pass should be controlled at 7~9mm.

2.2.7 When applying cement mortar to exterior walls, a sample should be made before large-scale construction. After passing the appraisal and determining the construction method, the construction can be organized.

2.2.8 The external shelves used during construction should be prepared in advance, and the horizontal and vertical poles should be 200 to 250mm away from the wall and corners to facilitate operation. In order to reduce the plastering joints and ensure the smoothness of the plastering surface, the outer shelf should be laid with three-step boards to meet the construction requirements. In order to ensure that the color of cement plastered on the exterior wall is consistent, it is strictly prohibited to use single-row exterior shelves. It is strictly prohibited to leave temporary holes in the wall.

2.2.9 Before plastering, the flatness of the surface of the substrate should be checked to determine the thickness of the plaster. Before plastering, the control lines of the plaster layer should be popped up on both sides of the large corner, balcony, window sill, and both sides of the rotating face as a basis for the base.

Quality assurance measures for plastering lime mortar on interior walls of plastering projects: Construction preparation

2.1 Main materials and machines:

2.1.1 Lime plaster: Apply in blocks Quicklime leaching must be filtered through a sieve with holes no larger than 3mm×3mm and stored in a sedimentation tank. The curing time is generally not less than 15 days at room temperature; when used for covering dust, it should not be less than 30 days. When used, lime paste must not contain unripened particles and other impurities.

2.1.2 Finely ground quicklime powder: its fineness should pass a 4900 hole/cm2 sieve. It should be soaked in water to fully mature before use. Its curing time should be more than 3 days.

2.1.3 Cement: No. 325 slag cement and ordinary Portland cement. There should be a factory certificate or retest sheet. When it has been out of the factory for more than three months, it should be used according to the test results.

2.1.4 Sand: medium sand with an average particle size of 0.35~0.5mm. It should pass through a sieve with a 5mm aperture before use. and must not contain impurities.

2.1.5 Paper tendons: They should be soaked in water, smashed, and clean before use; the covering paper tendons should be ground finely with a machine. Straw and straw should be tough, dry and free of impurities, and their length should not be greater than 30mm. Straw and straw should be soaked in lime slurry.

2.1.6 Ma knife: It needs to be soft, dry, loose when beaten, free of impurities, 10~30mm in length, and should be mixed with lime paste 4~5 days before use (synthetic fiber can also be used).

2.1.7 Main equipment: mortar mixer, paper ash mixer, flat shovel, sieve (aperture 5mm), narrow trolley, large bucket, ash trough, ash spoon, 2.5m large bar, 1.5m medium bar , 2m ruler board, wire drop, steel tape measure, square ruler, ash board, iron trowel, wooden trowel, plastic trowel, eight-shaped ruler, 5~7mm thick square mouth ruler, yin and yang angle trowel, long tongue iron Trowel, iron level, long-bristle brush, brush, wire brush, broom, watering can, rubber hose, small bucket, pink thread bag, small white thread, drill (point or flat head), hammer, pliers, nails, Wire support board, tool bag, etc.

2.2 Operating conditions:

2.2.1 The structural engineering must be inspected and accepted by the relevant departments. Plastering engineering can only be carried out after passing the inspection.

2.2.2 Before plastering, check whether the door and window frames are installed correctly and whether they are firmly connected to the wall. Use 1:3 cement mortar or 1:1:6 cement mixed mortar to seal the joint gaps in layers. If the gap is large, a small amount of hemp knife should be added to the mortar to make the gap dense; wooden door frames need Provide iron protection.

2.2.3 Smooth the concrete on the protruding parts of the lintels, beam pads, ring beams and composite columns. Honeycombs, pitted surfaces, exposed tendons, etc. should be removed to the full extent, brushed with plain cement slurry (107 glue mixed with 10% water content), and then filled with 1:3 cement mortar in layers; the feet, hands and eyes should be sealed tightly. Exposed steel bar heads, lead wire heads, etc. should be removed, and window sill bricks should be added; the junctions between internal partition walls, floor slabs, beam bottoms, etc. should be built tightly with inclined bricks.

2.2.4 When pipes pass through wall holes or floor holes, casings should be placed in time and filled tightly with 1:3 cement mortar or pisolite concrete; electrical pipes, fire hydrant boxes, and distribution boxes should be installed and Nail the exposed part behind with lead wire and seal the junction box tightly with paper.

2.2.5 The wall cabinet door frame and its wooden accessories have been installed; the position and elevation of curtain hooks, ventilation grates, wall cabinets and other embedded iron parts are accurate, and anti-corrosion and anti-rust paint have been applied .

2.2.6 The dust, dirt and oil stains on the surface of the brick wall base should be removed and moistened with water.

2.2.7 According to the indoor height and the specific conditions of the plastering site, prepare plastering stools or scaffolding in advance. The shelves should be 200 to 250mm away from the wall and corners to facilitate operation.

2.2.8 Before large-scale indoor construction, a construction plan should be formulated. A sample room should be built first, and then large-scale construction can be carried out after passing the appraisal.

2.2.9 When indoor plastering is carried out before the roof waterproofing project is completed, protective measures must be taken.