Characteristics of polyethylene closed cell foam board:
Polyethylene closed cell foam board is odorless, feels like wax, has a low temperature resistance function (low operating temperature can reach -70 ~ -100 ℃), good chemical stability, the ability of most acid and alkali corrosion (not resistant to oxidation Acid), insoluble in common solvents at room temperature, low water absorption, electrical insulation function; low density; good resistance (the same applies to low temperature conditions); good stretchability; good electrical and dielectric insulation; low water absorption; Low water vapor penetration rate; good chemical stability; tensile resistance; harmless.
Polyethylene closed cell foam board is divided into low foam polyethylene closed cell foam board L-1100 type (also called L-1400 type) and high foam polyethylene closed cell foam board L-600 according to the expansion ratio of polyethylene closed cell foam board Type two varieties hsyfxj2345631
According to the size of pressure, it can be divided into medium-pressure polyethylene closed-cell foam board (L-1100 type) and high-pressure polyethylene foam plastic board (L-600)
Among them, L-1100 type (also known as L-1400 type) is suitable for making cement joints and joints in ordinary water channels
Because L-600 is hard, it is suitable for making cement joints in reservoir dams
When the added amount of polyvinyl alcohol is less than 2%, the density of 3d and 28d decreases with the increase of the added amount, and when the added amount exceeds 2%, the density becomes larger. This is mainly because, when the added amount of polyvinyl alcohol is small, as the added amount increases, the increase in the consistency of the cement slurry becomes higher and higher, which in turn improves the phenomenon of foam upwelling and increases the test piece. Porosity, so the density continues to decrease; but when the amount of polyvinyl alcohol exceeds 2%, the density begins to increase, mainly for two reasons, one is that the amount of polyvinyl alcohol is too large, resulting in the consistency of the cement slurry Large, destroying part of the foam during the mixing process. Second, as the amount of polyvinyl alcohol increases, the retarding effect shown becomes more and more obvious. The setting time of the cement is too long, causing part of the foam to burst before being fixed. The combined effect of these two aspects reduces the density of foam concrete.
Technical requirements for construction of polyethylene closed-cell foam board
1. The closed-cell foam plastic board adopts high-pressure polyethylene low-foam closed-cell foam plastic board, and the performance of the material interacting with the sealant has no change.
2. The closed-cell foam plastic board for buildings should also meet the following indicators: density 120 ± 5 kg / m3, water absorption ≤4%, bending strength ≥2.5MPa, elastic modulus ≥1MPa, long-term compression deformation ≤2% , Tensile strength ≥0.15 MPa, elongation ≥100%.
3. Polyethylene closed-cell foam board should be laid on the seam side of the first cast block structure. The joints need not be overlapped, but the joints must be tightly connected.
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