| บทคัดย่อ |
In this study, the use of recycled non-biodegradable polyethylene terephthalate (PET) waste as a fine aggregate in
fly ash geopolymer mortar was examined. PET waste was used to replace 0%, 10%, 20%, 30%, and 40% by
volume of natural fine aggregate for preparing geopolymer mortar. The flow, density, porosity, water absorption,
ultrasonic pulse velocity (UPV), thermal conductivity, and strengths of the mortars were tested and compared
with those of ordinary Portland cement (OPC) mortar. The results showed that the mechanical properties of the
geopolymer mortar deteriorated with an increase in the amount of PET waste. The compressive strength
decreased from 42.7 to 12.8 MPa with increasing PET content from 0 to 40% for geopolymer mortars and
decreased from 49.5 to 22.5 MPa with increasing PET content from 0 to 20% for cement mortars. However, the
ratio of flexural strength to compressive strength of geopolymer and cement mortars containing PET waste
tended to improve. In addition, the density and thermal conductivity were significantly reduced with increasing
PET content; ranging from 1585 to 2020 kg/m3 and 0.6329 to 1.3116 W/m.K, respectively for geopolymer
mortar and from 1763 to 2042 kg/m3 and 1.181 to 2.0030 W/m.K, respectively for cement mortar. The reduction
of density and thermal conductivity in both types of mortar could be used to reduce self-weight and improve
thermal performance. |
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