Foam concrete roof insulation

Foam concrete roof insulation construction process:

1. Construction preparation:

Cement: Portland 325 should be more than the ordinary Portland cement, slag cement can also be used, the role of aggressive media, should be selected according to design requirements.

Sand: sand, shall not contain debris. Mud content of not more than 3%, 3-5mm aperture must be used before screening.

Admixture: Admixture selection and dosage should meet the design requirements and GB-50119-2003 norms.

Main equipment: foam concrete machine, mortar mixer, iron trowel, broom, wood trowel, scraper bar and so on.

2. Grass-roots processing: clean up debris clean, and water wet.

3. Preparation and use of foam:

Foam used in foam concrete should be made using special equipment. The foam diameter should be controlled between 0.5-2mm, and should be flexible, not broken. Concrete foam should be prepared with the use of indwelling time should not be greater than 20 minutes.

4. The leveling layer and the insulation layer should be constructed at the same time, insulation gradient should meet the design requirements, the grassroots and prominent roof structure (daughter walls, gables, skylights, deformation joints, chimneys, etc.) the junction and grassroots corners, insulation Should be made into a circular arc; within the drainage of water around the mouth, leveling layer should be made into a slightly lower pit.

5. The total thickness of more than 10 cm, should be layered construction.

6. Flat roof structure to find slope, the slope should not be less than 3%; using materials to find slope, slope should be 2%; gutter, gutter vertical looking slope, the slope should not be less than 1%.

Foam concrete roof insulation construction need to pay attention to the following points:

1. When the bulk density is less than 300kg / m3, the construction accelerates the coagulant. The content of the quick-setting admixture is generally 2% -8% of the amount of cement. The content of the admixture is appropriately increased or decreased with the quick-setting admixture, construction temperature and engineering requirements, Specific increase or decrease should be determined experimentally.

2. The construction site temperature should not be lower than 5 ℃.

3. After construction, should be moisturizing conservation.

Foam concrete roof insulation features:

1. Thermal insulation: thermal conductivity of 0.080-0.16W / (m · k), the thermal resistance of ordinary concrete is about 20-30 times.

2. Lightweight: The dry bulk density is 300-700kg / m3, which is 1 / 5-1 / 8 of ordinary concrete density, which can reduce the overall load of the building.

3. Integrity: on-site pouring construction, combined with the main project close, without leaving the seams and air pipes.

4. Sound insulation: foam concrete contains a large number of independent bubbles, and evenly distributed, sound absorption capacity of 0.09-0.19%, 5 times that of ordinary concrete, with effective sound insulation function.

5. Compression: compressive strength of 0.3-2.2Mpa.

6. Water resistance: a relatively independent closed bubble and a good overall, so that it has a certain waterproof performance.

7. Anti-cracking: low shrinkage, crack resistance is 8 times that of ordinary concrete.

8. Durability: the same as the main project life.

9. Simple construction: flat roof without another look for slope.