Compressive Strength, Water Absorption and Dry Density of Lightweight Concrete Blocks mixed with Hemp Shiv
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Abstract
This research aims to study the compressive strength, water absorption, and dry density of lightweight concrete blocks mixed with hemp shiv, using a combination of plaster and Portland cement as binder to develop lightweight concrete blocks according to the Thai Industrial Standard Institute (Cellular lightweight concrete blocks using preformed foam, TISI 2601-2556). The mix ratio was 1:1:1 by weight for cement: plaster: water. The hemp shiv was ground and sieved through meshes of 6, 10, and 25 mm in proportions of 3%, 4%, and 5% by total weight. The lightweight concrete blocks were molded to the size of 10 x 20 x 60 cm. The compressive strength was tested at 7, 28, 60, and 90 days, while water absorption and dry density were tested at 28 days. The results showed that the compressive strength of the lightweight concrete blocks decreased as the proportion of hemp shiv increased, while water absorption increased, resulting in a decrease in dry density. Additionally, it was found that hemp shiv sizes that passed through 6 mm and 10 mm meshes in proportions of 3%, 4%, and 5% met the criteria of TISI 2601-2556 and were classified as C10 and C9 lightweight concrete blocks, respectively.
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References
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