This process standard is suitable for ordinary and high-grade existing terrazzo ground engineering of industrial and civil buildings.
1 Material and main machinery:
1.1 Cement: White or light-colored terrazzo surface, white cement, dark terrazzo surface, Portland cement, ordinary Portland cement or slag Portland cement, its label should not be less than 425. The same batch of cement should be used for the same color surface.
1.2 Mineral Pigments: Pigments mixed in cement should be light-resistant and alkali-resistant mineral pigments, and acid pigments should not be used. The dosage of cement should be 3%-6% of the weight of cement or determined by test. The same color surface layer should use the same factory, the same batch of pigments.
1.3 Stone grains: They should be processed from hard and grindable dolomite, marble and other rocks. Stone should be clean and free of impurities. The particle size should be 4-14 mm, except for special requirements.
1.4 point grid
1.4.1 Glass Strip: Flat ordinary glass cut, 3 mm thick, 10 mm wide (depending on the thickness of the surface), the length depends on the size of the block.
1.4.2 copper bars: 1-2 mm thick copper sheets are cut into 10 mm wide (depending on the thickness of the surface layer), the length is determined by the size of the grid, and must be straightened and leveled before use.
1.5 sand: medium sand, sieve with 8 mm aperture, mud content should not exceed 3%.
1.6 Oxalic acid: Bulk or powdery, diluted with water before use.
1.7 white wax and 22 wire.
1.8 Main machines and tools: terrazzo mill, drum (diameter is generally 200-250mm, length is about 600-700 mm, concrete or iron), wooden plaster, brush, iron dustpan, ruler, trolley, shovel, 5 mm aperture sieve, oil stone (specification is thick, medium and fine), rubber hose, bucket, broom, wire brush, iron ware, etc.
2 operating conditions:
2.1 The plastering of roof and wall has been completed and accepted, and the waterproof layer of roof has been finished.
2.2 The door frame has been installed and protected. The water and electricity pipelines related to the ground have been installed in place, and the pipe holes through the ground have been blocked and stuffed.
2.3 Finish the ground cushion and set aside the thickness of the grindstone layer (at least 3cm) according to the elevation.
2.4 Stones should be screened separately and washed free of impurities.
3.1 process flow:
Base Treatment Elevation Finding Elastic Horizontal Line Laying and Leveling Layer Mortar Maintenance
Elastic partition grids inserting grids mixing terrazzo painting cement slurry bonding layer mixing terrazzo mixture painting cement slurry bonding layer
Paving Terrazzo Mixture Rolling, Smoothing Trial Grinding Rough Grinding Fine Grinding Fine Grinding
Grinding Oxalic acid cleaning Waxing and polishing
3.1.1 Base Treatment: Clean up the debris on the concrete base without oil pollution or floating soil. Use steel mash and wire brush to remove the cement slurry from the base.
3.1.2 Find the horizontal line of elevation bullet: According to the + 50cm elevation line on the wall, measure the elevation of the grindstone surface downwards, and bounce around the wall, and consider the elevation of other rooms and passages, to be consistent.
3.1.3 Leveling Layer Mortar:
184.108.40.206 According to the horizontal line popping up on the wall, the thickness of the surface layer (about 10-15 mm thick) is set aside, and the 1:3 cement mortar leveling layer is applied. In order to ensure the leveling layer's smoothness, the first one is to plaster the dust cake (about 1.5 m in the vertical and horizontal directions), and the size is about 8-10 cm.
After hardening of 220.127.116.11 gray cake mortar, the gray cake height is taken as the standard and the width of plastering bar is 8-10 cm.
18.104.22.168 Sprinkle water wet on the base, brush a cement slurry with a water cement ratio of 0.4-0.5, the area should not be too large. With the brushing slurry, the layer of mortar should be leveled with 1:3 paving, and scraped with a 2 m long scraper to the standard bar, then rubbed with a wooden plaster.
3.1.4 Maintenance: After plastering the leveling layer mortar, it will be maintained for 24 hours until the compressive strength reaches 1.2 MPa before the next working procedure can be carried out.
3.1.5 bullet subdivision line: according to the design requirements of the subdivision size, the general use of LM * lm. Play the cross line in the middle of the room. After calculating the edge width, the cross line is used as quasi-elastic partition grid. If the design requirements, should be in accordance with the design requirements pop-up clear lines.
3.1.6 Inserted grid bar: Fixed the grid bar with a small iron plaster and put it on the grid line to form a 30 degree octagonal shape (Figure 7-1). The height of the grid bar should be 4-6 mm lower than the top of the grid bar. The grid bar should be straight (the upper level must be consistent), firm, tight joints, no cracks, as the marking of the paving surface. In addition, in order to fill up the mixture, no cement slurry is applied within 40-50 mm from the intersection point (Fig. 7-2) when pasting the partition bar at the cross joint of the partition bar.
3.1.11 Trial grinding: Maintenance days are generally determined according to the temperature. Machine grinding can start in 2-3 days when the temperature is 20-30 C. It is easy to loosen the grinding grains too early, and it is difficult to polish them too late. Therefore, it is necessary to carry out trial grinding to ensure that the surface layer does not drop stones.
3.1.12 Rough grinding: For the first time, 60-90 rough diamond grinding is used to make the head of the grinding machine run across the "8" shape on the ground, and water is added while grinding (such as grinding surface layer maintenance time is too long, fine sand can be added to speed up the grinding speed), and the cement slurry is cleaned at any time, and the smoothness is checked by the ruler until the surface is smooth, grinded evenly, and divided into grinding strips. All the stones are exposed (the edges and corners are manually ground to the same effect), washed and dried with water, and then rubbed with a denser cement slurry (such as the surface layer with pigments, the cement slurry with the same proportion of pigments) once, especially the holes in the surface layer should be filled and smoothed, and the falling stones should be filled up. Watering and curing for 2-3 days.
3.1.13 Fine grinding: For the second time, 90-120 diamond grinding is used to grind until the surface is smooth. Then rinse with clean water and rub the cement slurry for the second time. Still pay attention to the fine and tight rubbing of the small pore, and then maintain for 2-3 days.
3.1.14 polishing: The third time, the surface of the stone is polished with fine diamond No. 200. The stone shows uniformity, no lack of stone particles, flat, smooth, no porosity.
The polishing times of ordinary terrazzo surface should not be less than three times. The thickness and polishing times of high-grade terrazzo surface and the specification of oil stone should be determined according to the design.
3.1.15 Oxalic acid scrubbing: In order to achieve remarkable effect after waxing, a proper amount of acid washing should be carried out on the grinding stone surface before making a mistake. Oxalic acid is usually used for scrubbing. When used, water and oxalic acid are first added to form a solution of about 10% concentration, dipped in a broom, then sprinkled on the ground, and then rubbed gently with oil stone; cement and stone are ground out. Granule color, then rinse with water and dry with soft cloth. This operation can only be carried out after the completion of various types of work, and the surface after pickling can no longer be polluted.
3.1.16 Wax polishing: Wrap the wax in a thin cloth and coat the surface with a thin layer. After drying, replace the oil stone with a piece of wood nailed with canvas or linen, and grind it on a grinder. Then polish the wax twice in the same way until it is smooth and bright.
3.1.17 During the construction of the existing terrazzo surface layer in winter, the ambient temperature should be kept above +5 C.
3.1.18 Terrazzo kickboard:
22.214.171.124 plastering: the same thickness as wall plastering. The thickness of kickboard is determined by prescription, gauge and drawing line at Yin-Yang angle. The distance is l-1.5m according to the thickness of bottom plastering. Then the gear is scraped flat with a short bar, and the wooden plaster is rubbed into a hemp surface and scratched.
126.96.36.199 Grinding Stone Kicking Board Mixing Material: First wet the base ash with water, in the Yinyang angle and the upper mouth, use the ruler to find the rules according to the horizontal line, stick to the ruler board, first brush a thin layer of cement slurry, followed by the mixing material, smooth and compact. Brush water twice to gently brush off the cement slurry, so that there is no floating slurry on the stone surface. After 24 hours of maintenance at room temperature, artificial grinding began.
The first time is to grind the crude oil stone vertically and then horizontally. It is required to grind the stone slag flat, chamfer the Yin and Yang angles, rub the first time with plain ash, fill the pore tightly, maintain it for 1-2 days, then grind the second time with fine oil stone, and finish the third time with the same method, Polish oxalic acid with oil stone, and clean it with clean water.