The development of concrete masonry units by luffa cylindrica fiber
Keywords:
Concrete, Concrete masonry units, Luffa cylindrica fiberAbstract
This article describes development of concrete masonry units made from luffa cylindrica fiber to be an environment–friendly material in order to promote the use of
agricultural material in architectural work. Chopped luffa cylindrica fiber was used as
admixture of concrete masonry units based on Thai Industrial Standard of Non–Load
Bearing Concrete Masonry Unit in type of non–moisture controlled units 58 – 1990. There were 5 mixture ratios by having prototype concrete masonry unit mixture of Portland
Cement Type I : sand : gravel = 1 : 3 : 5 by weight (kg.) with 10% of clean water by total mixture weight and then replaced gravel with luffa cylindrica fiber in ratios of 25, 50, 75 and 100 by weight. The concrete masonry units were casted in 10 x 10 x 10 cm3 cube steel molds in order to find out the maximum ratio of luffa cylindrica fiber used to replace gravel to produce concrete with the standard size of 70x190x390 mm with dimensional coordinate of 4/5 x 2 x 4 according to Thai Industrial Standard 58 – 1990. The research results showed that D formula with 75 grams of luffa cylindrica fiber replacement for gravel was the maximum ratio to give average density of 1237.95 kg./m3., compressive strength of 3.19 MPa, 0.044% of lengthwise shrinkage, 11.17% of water absorption and 0.132 W/m.K of
thermal conductivity. It could be concluded that luffa cylindrica fiber could be admixture of non–load bearing concrete masonry units which could be applied with architectural work as well.
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