With the development of the construction industry, the cast-in-place foamed concrete floor slab (cover) is very common, which is very important in the roof insulation project, but in the actual construction, there is a problem of quality common problem - that is, the crack problem, now There are many reasons for the cracking of the foamed cement floor slab. For example, the foaming cement has a poor mixing ratio, the foaming cement is too viscous, and the bubbles are difficult to discharge when vibrating, which is also the cause of the honeycomb surface of the hardened foamed cement structure.
If the cement is too much, the sand ratio is too large, the water consumption is too small, and there are unreasonable thickening components in the admixture, the fresh foaming cement will be too thick, so that the foaming cement will wrap when stirred. It is very difficult to discharge a large amount of air bubbles even in the viscous concrete. Due to the poor workability of foamed cement, it can only be prevented and improved from many aspects such as design, construction, delivery and use. Of course, rational use is also crucial.
The designer must consider various influencing factors as much as possible, and take appropriate reasonable reinforcement and splitting according to different structural parts. Strictly implement the norms and mandatory provisions in the design, so as to meet the structural case and reduce the possibility of structural cracks.
Appropriate expansion of the reinforcement ratio can play a certain role in foaming cement shrinkage and crack propagation. Appropriate increase in the effective thickness of the floor can also play a role. The strength of the foamed cement of the cast-in-place plate is less than or equal to C30, and the stress of the steel bar should meet the crack resistance requirements. Appropriate technical measures shall be taken for the overlapped and reserved openings of the pre-buried pipelines in the cast-in-place board to prevent the thickness of the board from being reduced and the effective crack-resistant thickness of the board to be reduced.
Strictly control the quality of raw materials, and all materials used must meet the requirements of the design and relevant national standards. Optimize the construction mix ratio design of foamed cement, add high-efficiency water reducing agent, and appropriately reduce the water-cement ratio. According to the design drawings, the steel bars are bundled, the pipelines are pre-buried, and the openings are reserved. There must be effective measures to ensure the thickness of the plates and the position of the steel bars during construction. The template support is firm, there is sufficient strength and rigidity, and the mold removal time is reasonably mastered. The template must be brushed with a release agent, and it is forbidden to remove the mold. The roof must be prohibited from being concentrated and piled up during construction.
Clip Spring,Metal Spring Clips,Spring Loaded Clips,Stainless Steel Spring Clips
applicaiton: viation,automotive, motorbike, bicycle, automatic equipment, household appliance, medical device ,toy, telecommunication,computer, instrument and meter,furniture, electric tools,mold and other industries
China Clip Spring,Metal Spring Clips,Spring Loaded Clips,Stainless Steel Spring Clips, we offered that you can trust. Welcome to do business with us.
Clip Spring,Metal Spring Clips,Spring Loaded Clips,Stainless Steel Spring Clips
Shenzhen Lanejoy Technology Co.,LTD , https://www.szsmallcompressionspring.com