Lightweight Nja Additives | Awọn aṣoju Fọmu Iṣe-giga fun Nja Cellular
1. Construction preparation
Simẹnti: Ordinary Portland cement above No. 325 should be used, or Portland slag cement can also be used. When there is an aggressive medium, it should be selected according to the design requirements.
Sand: Use medium sand, which must not contain debris. The mud content must not exceed 3%, and it must be passed through a 3-5mm sieve before use.
Main equipment: foaming machine, mortar mixer, iron trowel, broom, wooden trowel, scraper, ati be be lo.
2. Layer treatment: clean up and sweep the debris, and moisten it with water.
3. Preparation and use of foam
The foam used in foam concrete should be prepared with a special cement foaming machine. The diameter of the foam should be controlled between 0.5-2mm, and it should be elastic and not easily broken. The concrete foam should be prepared and used, and the retention time should not be longer than 20 iseju.
4. The leveling layer and the insulation layer should be constructed at the same time.
The slope of the insulation layer should meet the design requirements. The junction between the base layer and the protruding roof structure (parapet, gable, skylight wall, deformation joint, chimney, ati be be lo.) and the corner of the base layer, the insulation layer All should be made into a circular arc; the leveling layer should be made into a slightly lower pit around the water drop of the internal drainage.
5. When the total thickness exceeds 10cm, it should be constructed in layers.
6. Use structure to find slope for flat roof, and the slope should not be less than 3%; use material to find slope, and the slope should be 2%; for gutter and eaves to find slope longitudinally, the slope should not be less than 1%, and the water drop at the bottom of the ditch should not exceed 150mm .
Precautions for foam concrete roof insulation construction:
1. When the density is lower than 300kg/m3, the accelerator should be used during construction. The amount of accelerator is generally 2%-8% of the cement amount. The amount of accelerator should increase or decrease according to the type of accelerator, construction temperature and engineering requirements. The specific increase or decrease should be determined by experiment.
2. The temperature at the construction site should not be lower than 5℃.
3. After construction, it should be moisturized and maintained.
Features of foam concrete roof insulation:
1. Gbona idabobo: the thermal conductivity is 0.080-0.16W/(m·k), ati awọn gbona resistance jẹ nipa 20-30 igba ti o ti arinrin nja.
2. Ìwúwo Fúyẹ́: The dry bulk density is 300-700kg/m3, eyi ti o jẹ 1/5-1/8 of the density of ordinary concrete, eyi ti o le din awọn ìwò fifuye ti awọn ile.
3. Òtítọ́: on-site pouring construction is closely integrated with the main project, without boundary gaps and vent pipes.
4. Idabobo ohun: Foam concrete contains a large number of independent bubbles, nwọn si pin boṣeyẹ. Agbara gbigba ohun jẹ 0.09-0.19%, eyi ti o jẹ 5 igba ti o ti arinrin nja, and it has an effective sound insulation function.
5. Ifarabalẹ titẹ: The compressive strength is 0.3-2.2Mpa.
6. Omi resistance: jo ominira titi nyoju ati ti o dara iyege, so that it has a certain waterproof performance.
7. Anti-crack: low shrinkage rate, crack resistance is 8 igba ti o ti arinrin nja.
8. Iduroṣinṣin: kanna bi awọn aye ti akọkọ ise agbese.
9. Simple ikole: no need to find a slope for the flat roof.
10. Aje: 20-50% lower than the comprehensive cost of other roof insulation materials.
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