Recycled Thermoset Plastics 197
13.5.6 Comparison between the Results this chapter and the Results of the
Studied by Panyakapo and Panyakapo [5]
Based on the results, the optimum proportions of materials are cement: aluminum
powder: water: sand: melamine: silica fume: superplasticizer equal to 1.0:0.004:0.35:
1.4:2.0:0.25:0.007. However, the optimum proportions of materials for the studied by
Panyakapo and Panyakapo [5] were cement: sand: water: fly ash: aluminum powder:
melamine equal to 1.0:0.8:0.75:0.3:0.0035:0.9. Therefore, the use of melamine plastic
more than study (about 122%) for non-load-bearing lightweight concrete according to
[1] Type II standard. Also, the dry density of non-load-bearing lightweight concrete
was reduction by 36.4% in comparison with the study.
13.5.7 Comparison Research Findings on the Use of Waste Plastic in
The results of this study are in a perfectly agreement with the other research findings
on the use of waste plastic in concrete (see Table 6).
TABLE 6 Comparsion between results of this study and other research findings on the use of
waste plastic in concrete (by increase plastic).
Description Type of waste plastic Compressive
Density Absorption void
This study Melamine Decrease Decrease Increase Increase
[11] PET Decrease Increase Increase
Kou et al, 2009 PVC Decrease Decrease
[9] PET Decrease Decrease Increase Increase
[5] Melamine Decrease Decrease
[1] 80% polyethylene and
20% polystyrene
Decrease Decrease
[5] PET Decrease Decrease
13.5.8 Comparison between Test Results and Various Standards
The results of compressive strength and dry density are 7.06 N/mm
and 887 kg/m
respectively. It was found that the compressive strength of plastic lightweight concrete
exactly satisfy the class 4 of aerated lightweight concrete according to Institute of
Standards and Industrial Research of Iran (ISIRI 8593-1st Edition). However, the dry
density is some greater than the ISIRI standard. In addition, the results of this study
exactly satisfy the specifications of rendering or plastering mortar for utilization of
public and rendering or plastering lightweight mortar according to ISIRI 706-1 stan-
dard (1st Revision). Rendering and plastering mortar are widely used in Iran. These
comparisons are summarized in Table 7.

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