First, the basic treatment
1. New Cement Concrete Foundation:
1.1 Basic requirements:
Solid leveling (flatness requirement: 3m ruler error is not greater than 3mm), a certain degree of drainage slope, strength of the building concrete standard C25 strength, water conservation after pouring is not less than 7 days, the whole curing curing period is not less than 28 days ( The solidification time of the cement is ensured so that the white powder produced by the cement during the solidification process is completely deposited on the base surface). After the new cement foundation is cast, a reasonable temperature expansion joint must be cut. The principle is to cut not more than 6x10m squares. If the temperature of the plate is to be cut between the sub-blocks (because the fracture surface is formed between the two plates, it is affected by thermal expansion and contraction). The most obvious) is that the cutting temperature seam requires a width of 6~8mm and a depth of no less than 30mm, (guarantee that the basic thermal expansion and contraction energy can be concentrated in the temperature seam without causing cracks in the rest of the foundation).
1.2 Basic treatment: (milling - pickling - primer - caulking - leveling, repair)
1.2.1 grinding seam:
Grind the bases on both sides of the temperature seam 40~50mm wide into a 3mm deep slant (as shown in figure (1)) to make the surface of the temperature seam "V" type (each 40~50 width is to increase the gap The adhesive area of ​​the surface increases its adhesive force, and the depth of 3mm is the position for ensuring the thickness of the sealant without occupying the elastic layer, ensuring the overall cushioning property, so that the thermal expansion and contraction of the base does not affect the surface of the silicon PU).
figure 1)
1.2.2 Pickling:
Wet the foundation with clean water (prevent dilute hydrochloric acid from infiltrating into the base or oxalic acid), dilute and wash the base surface with dilute hydrochloric acid at a concentration of 10% left, and rinse with clean water (usually rinse twice). After washing and drying, ask for a base surface. Cement primary color, no white powder and loose material. During the pickling process, the water level should be circled and marked.
1.2.3 Primer:
After the foundation is sufficiently dry, apply a special primer (YF-101) to the base surface. Apply the basic surface to the wet color after brushing. Insufficient areas should be coated (The effect of the primer is to penetrate the micro pores of the foundation. Inside, solidified base after curing). Basic surface strength
1.2.4 Caulking:
After the priming is completed, the "V" groove is filled with two or more points of YF-002.
figure 2)
1.2.5 leveling, repairing:
During the pickling process, the water trapped in the process shall be 1:1 (weight ratio) with an elastic layer (YF-002) with a surface coating not exceeding 5mm and a special layer of sand. Squeegee leveling water; if the water depth is more than 5mm, apply YF-002 thin coating to the water, then use primer (YF-101) plus 40~80 mesh sand 1:6~8 (Weight ratio) Mix evenly, level and paving in the water and compaction, (The role of thin coating YF-002 to ensure that the repair material and the base surface bond firmly; If the sand finer> 80 mesh, the amount should be reduced accordingly, The thickness of each repair shall not exceed 15mm. When repairing, pay attention to edging. Do not allow the repaired side to be higher than the base surface. If there is an overhang, the elastic layer shall be constructed after being smoothed after curing.
2, old cement concrete foundation:
2.1 Basic requirements:
Solid, flat, without sinking plate, broken cracks no more than 10mm wide, if you do not cut a reasonable temperature seam, you must cut the temperature seam according to the requirements of the new cement foundation. If the foundation is sinking or extremely uneven, and there are too many broken cracks, it is recommended to lay the leveling foundation again with asphalt concrete (>40mm thick) or cement concrete (>50mm thick).
2.2 Basic processing:
Basically deal with the new cement concrete foundation treatment method. If the foundation has cracks more than 2mm wide, apply a cutting machine to widen the column 6~8mm, according to the requirements of the new cement base grinding, caulking; if the width is less than 2mm to grind the surface of the joint into a "V" shape, width 40 ~ 50mm, depth 3mm, can be filled directly with YF-002. (Figure (3) shows)
image 3)
3, asphalt based:
3.1 Basic requirements:
Uniform and solid surface, no oil, no unstirred asphalt block, flat and crack-free, no lumps, no pockmarks, smooth and smooth joints, no water blocking phenomenon, compaction density of not less than 95%, in After medium-sized roller press, there are no obvious wheel marks, no soft peeling, no loose floating soil, no wave, etc., flatness of 3mm ruler error is less than 3mm, flatness pass rate is greater than 90%, there is a certain degree of drainage slope, guarantee Drain water. The natural maintenance of the new asphalt base is not less than 28 days, so that the high-boiling volatiles in the asphalt are completely volatilized, ensuring that the silicon PU material has a good bond with the foundation.
3.2 Basic processing:
3.2.1 Cleaning:
Use washing powder or liquid detergent to clean the base surface and then rinse with clean water. The cleaned foundation should be free of dirt and other loose debris. Mark the mark of the water level when cleaning.
3.2.2 Leveling:
Use professional bottom layer YF-102:32.5R cement: 50~100 mesh sand=1:1:1 (weight ratio), mix evenly (adjust the construction consistency with water), and use a squeegee to apply two or more coats to the base surface. Requires that the gaps on the base surface must be filled and sealed to ensure that there are no pinholes after the solidification and the surface is smooth and does not affect the subsequent construction. If the base surface gap is large, the first coater may press YF-102:32.5R cement: 50~100 mesh sand=1:2:2 (weight ratio), and stir it after being evenly coated; second press YF -102:32.5R cement: 50 to 100 mesh sand = 1:1:1 (weight ratio). (Rough base, large gaps, the amount should be increased)
3.3.3 water leveling repair:
According to new cement foundation requirements 1.2.5 treatment.
Second, silicon PU material construction
(elastic layer → surface → scribing)
1, elastic layer:
The elastic layer should be carefully inspected before construction to ensure that the elastic layer is applied after the basic treatment is completed. The elastic layer (YF-002) is a one-component water-absorbent curing material and is directly applied to the base surface with a squeegee. The thickness of each squeegee cannot exceed 2mm, each squeegee interval is determined by the previous dryness (usually about 12 hours, depending on the weather conditions on site) until the required thickness is reached. Construction should be avoided under high temperature and in the sun. After construction, it should be kept for 2 to 3 hours without violent sunlight. Otherwise, surface blisters may be caused by surface forming too quickly. After the elastic layer is solidified, the surface flatness is tested by the stagnant water method, and the accumulated water is repaired and flattened with YF-002. If there is any debris or accumulation on the surface, the surface layer construction can only be carried out with a grinding machine or other tools.
2, surface layer:
The surface layer (YF-004) is a two-component waterborne material. The two components must be mixed thoroughly and in a specified ratio (otherwise it will affect the curing effect of the surface layer and directly affect the performance of the surface layer). Add a certain proportion of special sand Diluted with water to the appropriate viscosity, divided into multiple layers on the elastic layer. The lowest temperature is lower than 5°C. It is not suitable for construction. After the construction, the water is soaked for 10 hours. The construction method can be sprayed, troweled or roller coated.
4, crossed:
Measure according to the standard size, mark the position of the boundary line, and apply masking paper on both sides of the boundary line. Apply special marking paint (YF-005) on the textured paper. After the surface is dry, tear off the textured paper. . YF-005 is a two-component material. It is necessary to mix the A and B components in the prescribed proportions and mix them in two passes. If the surface of the court is a rough surface, the first channel can be coated with 20% of special surface sand to prevent seepage.
5, matters needing attention:
5.1 When mixing materials, it must be weighed accurately and evenly.
5.2 The use of any auxiliary materials must be tested before construction to confirm that there is no problem before use.
5.3 The entire construction process The surface must be kept clean before each procedure.
5.4 The interval between each process should not be too long, so as not to affect the bond strength between layers.
5.5 Before finishing the construction, it is necessary to polish the elastic layer as a whole.
5.6 Indoor venues must ensure good ventilation.
5.7 It should be kept for more than 7 days after the site is laid.
Silicon PU construction common problems and solutions:
1. Cement base surface has low surface strength (turning sand): The powdered layer on the surface is cleaned with hydrochloric acid, dried and then penetrated into the foundation with a larger amount of primer (YF-101) to reinforce the base surface. The dosage depends on the basic situation, and it is required that the surface color of the base surface be changed to a wet color after drying.
2. Basic repair: Apply a thin coat of YF-002 to the water, then mix the base coat (YF-101) with 40 to 80 mesh sand and mix it evenly by 1:6 (weight ratio). Spread it evenly in the depression and Compaction.
3, YF-002 curing time is long: The reason is that the climate is dry, the temperature is low, resulting in slow curing. It is possible to add 3 to 5 ‰ (material weight ratio) of water to dilute together to accelerate the solidification of the material.
4, surface floating color: generally occurs in the composite color material, because the dilution of the material when the water is too much to make the material no consistency, the surface dry time is too long, resulting in a lighter pigment floating surface. Water should be added as little as possible without affecting the construction.
5, the surface layer is not wear-resistant or low strength: reasons 1) B component is insufficient or uneven mixing; 2) dry time is too long (more than 6 hours); 3) temperature is too low (below 10 °C); The coating is too thick at one time (the amount is more than 0.2kg/m2); 4) The components A and B can't be constructed in time after being mixed, and the storage time is too long. The materials shall be formulated according to the proportion of A and B components strictly. The surface layer shall be applied under the conditions of a temperature greater than 10°C and a humidity of less than 85%, and each squeegee (spray) shall be controlled to less than 0.2 kg/m2.
6. Bubbling after construction: Causes 1) The pickling of the basic treatment is not enough, and the powdered layer is not clean; 2) The surface strength of the foundation is low and the primer is insufficient; 3) The basic drying is not enough and the water content is too high. Treatment method: cut off the blisters, powdered layer of polished layer of powder off, coated with a primer after the repair; base surface strength is insufficient to apply primer after penetration reinforcement; after the base dry enough to dry Fix it.
7. Cracking of temperature joints after construction: Causes 1) Basic fracture caused by foundation settlement deformation; 2) Insufficient temperature joint treatment leads to insufficient buffering for thermal expansion and contraction deformation of the foundation. Temperature seam treatment must be strictly in accordance with the requirements of the construction guidelines. The settlement and fracture of the foundation can only be dealt with after the foundation settlement has stabilized.
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