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Title |
An Experimental Study for Recycling of the Waste PET Bottle as a Fine Aggregate for Lightweight Concrete
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Keywords |
폐 PET 병; 폐 PET 병 활용 경량골재(WPLA); 비중; WPLA를 사용한 콘크리트; 압축강도; waste PET bottle; lightweight aggregate using waste PET bottle(WPLA); specific gravity; concrete with WPLA(WPLAC); compressive strength |
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Abstract |
The qualify of lightweight aggregate made from waste PET bottle(WPLA) and the workability, the unit weight and strength property of concrete with WPLA were investigated for the purpose of recycling the waste PET bottles as lightweight concrete fine aggregate. This study indicated a good result that WPLA should be replaced with less than 50% of natural fine aggregate. When WPLA was replaced with 50% of natural fine aggregate, the specific gravity and water absorption of mixed fine aggregate were greatly reduced about 23 and 75% respectively in comparison with those of river sand. The quality of WPLA affected on the properties of lightweight aggregate concrete. The workability of fresh concrete with WPLA(WPLAC) was improved with increasing the replacement ratio of WPLA and water cement ratio. Slump increasing ratio of the former showed about 45~120% because that a specific gravity of fine aggregate was decreased from 2.6 to 1.7. The unit weight of concrete with 75% WPLA was decreased about 17% in comparison with that of control concrete. Furthermore, the compressive strength of concrete with 25 and 50% WPLA at the age of 28 days increased higher than 30 MPa regardless with water cement ratio (W/C=45, 49 and 53%) of this study. Specific strength of concrete with 25% WPLA, 15.11×10³MPa·㎥/kg, was higher than that of contro concrete in water cement ratio of 49%. The compressive strength-splitting tensile strength ratio and compressive strength-modulus of elasticity ratio of WPLAC were similar to that of nomal lightweight aggregate concrete. This results showed a good estimation that WPLA will be able to recycled as a fine aggregate for lightweight concrete.
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