This study investigates the suitability of using plastic,

\r\nsuch as polyethylene terephthalate (PET), as a partial replacement of

\r\nnatural coarse and fine aggregates (for example, brick chips and

\r\nnatural sand) to produce lightweight concrete for load bearing

\r\nstructural members. The plastic coarse aggregate (PCA) and plastic

\r\nfine aggregate (PFA) were produced from melted polyethylene

\r\nterephthalate (PET) bottles. Tests were conducted using three

\r\ndifferent water–cement (w\/c) ratios, such as 0.42, 0.48, and 0.57,

\r\nwhere PCA and PFA were used as 50% replacement of coarse and

\r\nfine aggregate respectively. Fresh and hardened properties of

\r\nconcrete have been compared for natural aggregate concrete (NAC),

\r\nPCA concrete (PCC) and PFA concrete (PFC). The compressive

\r\nstrength of concrete at 28 days varied with the water–cement ratio for

\r\nboth the PCC and PFC. Between PCC and PFC, PFA concrete

\r\nshowed the highest compressive strength (23.7 MPa) at 0.42 w\/c ratio

\r\nand also the lowest compressive strength (13.7 MPa) at 0.57 w\/c

\r\nratio. Significant reduction in concrete density was mostly observed

\r\nfor PCC samples, ranging between 1977–1924 kg\/m³. With the

\r\nincrease in water–cement ratio PCC achieved higher workability

\r\ncompare to both NAC and PFC. It was found that both the PCA and

\r\nPFA contained concrete achieved the required compressive strength

\r\nto be used for structural purpose as partial replacement of the natural

\r\naggregate; but to obtain the desired lower density as lightweight

\r\nconcrete the PCA is most suited.<\/p>\r\n","references":null,"publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 101, 2015"}