Strength and Quality Analysis of Plywood Used in Concrete Formwork
Nowadays, plywood used in concrete formwork is widely used in engineering construction, which greatly improves the overall level of construction quality. In this post, the shear failure of the plywood layer will be caused by the tensile load, and the bonding quality of veneer-based panels will be determined. Combined with the testing of the bonding strength of the main items of the plywood used for concrete formwork, the reuse rate of the plywood used for concrete formwork will be finally obtained.
Key words Film faced Plywood; Concrete formwork; Strength
In recent years, China’s economy is developing rapidly, and the construction industry is also developing rapidly, which makes the use of plywood concrete formwork has become the traction of market demand growth. Plywood is widely used in the eastern and southern regions of China, and has formed industrial clusters. In Hebei, Shandong, Zhejiang, Guangdong and Guangxi, the plywood industry has developed rapidly, and has become a key area for the production of concrete formwork plywood.
1. Present situation of plywood for concrete formwork in China
In recent years, plywood for concrete formwork has been widely used in engineering construction in China, which greatly improves the overall level of construction quality. Since entering the new century, wooden formwork has gradually replaced other building formwork, which makes the current market of plywood for concrete formwork in short supply. However, while the plywood used for concrete formwork is popular, problems such as confusion and unstable quality appear in the market. In view of various problems, we must fundamentally strengthen the supervision and management of enterprises. The testing units should also conduct spot checks on plywood used for concrete formwork, and summarize and analyze the results.
2. Main Quality Problems of Plywood Used in Concrete Formwork
2.1 Unqualified Bonding Strength
The bonding strength is an important criterion for evaluating the quality of plywood used in concrete formwork. It can not only reflect the overall stability of product structure and resistance to stress, but also reflect the ability of product to open under moisture. Unqualified bonding strength is the primary problem in the quality of plywood used for concrete formwork. Once the bonding strength of the product is not up to standard, there will be delamination , fracture and other phenomena in the use process, which has a great impact on the life and safety of the product.
2.2 Unqualified Static Strength and Elastic Modulus
Another major factor affecting the quality of plywood used for concrete formwork is the static strength and elastic modulus, which reflects the maximum ability of the product to resist external forces and not to be damaged by itself. When the static strength and modulus of elasticity are not up to standard, the product will not have enough ability to resist the effect of external force, or under the same external force, the product has the greatest degree of deformation, unqualified products are very prone to fracture in use, and the risk is great.