Common problems and preventive measures of autoclaved Lightweight Aerated concrete slab (ALC wall slab)
ALC wall panel is made of fly ash, cement, lime and other main raw materials. It is double-layer bi-directional welded steel mesh with anti-rust and anti-corrosion technology inside. It can meet different structural design requirements and is made of porous concrete formed by high-pressure steam curing.
ALC board can be used as both wall material and roof board. It is a new environmental protection building material with superior performance. ALC plate has the function of light and environmental protection, increase the area of use, fast construction speed and short construction period, and has good fire prevention, sound insulation, heat insulation, heat preservation, moisture-proof, environmental protection, economy, earthquake resistance, anti-permeability, anti-aging and many other advantages. Can be widely used in concrete structure and steel structure residential buildings, office buildings, schools, hotels, hospitals, shopping malls, supermarkets, factories, agricultural greenhouses, commercial, industrial and other commercial and civil buildings.
Prevention and treatment measures of common quality problems
The common quality problems of ALC wallboard are cracks.
Cracks usually occur in the following parts:
1. Cracks appear at the splicing between wall panels and wall panels
2. Cracks appear at the junction of wall panel and ground as well as at the junction of ceiling;
3. Cracks appear between wall panels and concrete columns or shear walls.
preventive measures
1. Improve the production process
The production of autoclaved lightweight aerated concrete slab requires large slump and water-cement ratio, and excessive water. When the cementitious material is solidified, a large number of pores will be produced. In the production process should be strict control of the mix of various materials, reasonable ratio can not only increase the strength, but also greatly reduce shrinkage. Make brick to ensure safe and reliable, before choosing wallboard material, should thorough each production enterprise undertakes on-the-spot investigation, understand their production technology, production scale, product quality and enterprise production capacity to wait, the wallboard material that assures use from this accords with national each standard.
2. Choose the appropriate joint material
Joint materials should not only have high strength, but also have good deformation ability. Joint materials have an important influence on whether cracks occur. When the wall panel is installed, special function mortar is used instead of common cement mortar as the caulking mortar for installation. Special function mortar has better workability, adhesion, durability, frost resistance, water resistance and so on.
3.Properly control the installation unit
For the construction and installation of the longer wall, the long wall is divided into a number of installation units, and the installation is carried out at a certain distance to reduce the wall shrinkage stress and prevent cracking.
4.Pretreatment of cracking parts
ALC wallboard is easy to crack in the contact parts with the frame, the slot parts of the line pipe, the joint and other parts. In order to prevent cracking, preventive measures should be taken in time.