Discarded polystyrene foam (hereinafter referred to as polyphenyl foam) is increasing year by year, resulting in garbage pollution. Because of its stable performance, it has the economic value of reuse. The waste polyphenyl foam is crushed and mixed with the cement according to a certain mixing ratio. It is a good thermal insulation material for building insulation.
The pulverized polyphenyl foam is granular and has a diameter of 5-15 mm. After being mixed with cement, water is added and stirred to form a lightweight concrete with a polyphenyl foam as the main body and a cement slurry as the cement material. This concrete has the following characteristics:
(1) Plasticity can be poured into the corresponding parts according to the needs of the insulation parts. Admixtures that incorporate alkaline water, binding, and other functions will have better performance, and will be even more extensive if used in light weight concrete.
(2) The surface density of light-weight waste polyphenyl foam is 20-kg/m3, and the wet density of concrete after processing and stirring is 220-270kg/m3, which is basically equivalent to expanded perlite. The density after drying can also be greatly increased. To reduce, the reduction is about 1/4 of the wet density.
(3) Stable performance of heat preservation The final insulation of the cement slurry forms an integral heat preservation layer. Due to the extremely low water absorption rate of polyphenyl foam, even if the concrete is repeatedly subjected to water immersion, the heat preservation performance can be restored and it has a certain durability. Due to the mixture of materials, it is not appropriate to directly touch the heat source above 70°C, and an insulation layer should be provided on the surface to avoid loosening, shrinkage and other undesirable changes caused by overheating.
(4) Low thermal conductivity When the body reaches a dense, non-conspicuous honeycomb, a 12cm-thick insulation layer can achieve the insulation effect of a 49cm brick wall. When the concrete is used for plane heat preservation, the requirements for cement types and labels are not excessive. But when used in other parts, it should be determined according to the structural characteristics of the corresponding parts. When used for roof insulation, the upper part is provided with a leveling layer. In this case, the integrity is better, and the labeling of the cement does not require excessive requirements. When used for the thermal insulation of the facade, the structure is complex and not only serves as a single insulation effect. More importantly, it is required that the structural performance of the insulating layer be stable so as to ensure the safety of the envelope structure, and the cementing material cannot be arbitrarily selected.
This kind of lightweight concrete containing polyphenyl foam can be poured not only in-situ but also can be prefabricated into profiles such as brick boards. Because of its excellent performance, flexible and diverse methods of use, it has great prospects for development. (Jianwen)
Reuse of Waste Polystyrene Foam Plastic
December 22 05:08:48, 2023
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