Journal of Agricultural Science and Engineering
Articles Information
Journal of Agricultural Science and Engineering, Vol.7, No.3, Sep. 2021, Pub. Date: Jul. 28, 2021
The Compressive Strength of Load Bearing Low Density Polyethylene (LDPE) - Bonded Concrete Blocks
Pages: 58-63 Views: 87 Downloads: 19
Authors
[01] Bruce Roy Thulane Vilane, Department of Agricultural and Biosystems Engineering, Faculty of Agriculture, University of Eswatini, Luyengo Campus, Luyengo, Kingdom of Eswatini.
[02] Mhlanga Setsabile Temhlanga, Department of Agricultural and Biosystems Engineering, Faculty of Agriculture, University of Eswatini, Luyengo Campus, Luyengo, Kingdom of Eswatini.
[03] Shongwe Mduduzi Innocent, Department of Agricultural and Biosystems Engineering, Faculty of Agriculture, University of Eswatini, Luyengo Campus, Luyengo, Kingdom of Eswatini.
Abstract
Responding to the world’s increasing demand for concrete’s alternative bonding materials that could lower the reliance on Portland cement, without compromising the compressive strength, is a research activity that currently drives the construction industry. An experiment was conducted to determine the effect of sand:plastic ratio on the compressive strength of LDPE bonded sand mortar. The experiment had five treatments, which were the mix ratios (1:2, 1:3, 1:4 and 1:5) excluding the control. The control was the standard concrete block (sand:Portland cement fabricated using the local 1:5 mix) and a water/cement ratio of 0.5. Tests conducted were compressive strength and water absorption tests. Each specimen was 100 mm x 60 mm hexagonal block. Each treatment including the control had three replications and the compressive strength was tested after 7, 14 and 21 days of curing. The results reflected that the mean compressive strength for the LDPE-bonded concrete blocks 1:2, 1:3, 1:4, 1:5 and the control were 1.35 N/mm2, 4.95 N/mm2, 9.92 N/mm2, 8.5 N/mm2 and 8.80 N/mm2, respectively after 21 days of specimen aging. The compressive strength of the different ratios increased with a decrease in the amount of plastic in the mix ratio until treatment 5, where the compressive strength decreased. The 1:2, 1:3, 1:4 and 1:5 mix ratio LDPE-bonded concrete blocks had compressive strengths that were significantly different (P<0.05) from the control. The experiment reflected that after 21 days, the water absorption of the LDPE-bonded concrete blocks with the mix ratios 1:2, 1:3, 1:4, 1:5 and the control were 1.68%, 2.35%, 4.57%, 5.65% and 6.8% for treatment 2, 3, 4 and 5, respectively.
Keywords
Compressive Strength, Load Bearing, Low Density Polyethylene (LPDE), Bonded Concrete Blocks
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