Recycled Chopped Rice Straw–cement Bricks:
An Analytical And Economical Study
Author(s)
M. Allam & G. Garas
Abstract
The Egyptian rice yield is one of the highest in the world (9.1 tons per hectare in
2001), a crop that leaves behind roughly 4.0 million tons of straw annually.
Because of limited water resources, the government of Egypt has tried to limit
rice cultivation. However, cultivation has continued to expand due to rice
production’s high profits. The methods for disposing of the straw and stubble
residue remaining in the fields after harvest are either burning or baling.
Although some limited uses of rice straw, such as for animal feed or paper
making, are maintained, burning is still the principal disposal method for most of
the rice straw residue, as it is efficient, effective and cheap, even after being
phased out in the Egyptian law of Environment number 4-1994. As a result most
farmers tend to burn the straw in open fields, boosting air pollution and serious
human health problems due to the emission of carbon monoxide.
This paper addresses the recycling of chopped rice straw to produce light
weight cement bricks to be used as fillers in skeleton type buildings. The
production of these bricks was studied analytically to reach the best mix
proportions under compression strength not less than 80 kg/cm2 according to the
Egyptian codes of building. An economical market study for the mass production
of the cement brick has been carried out.
It was concluded that the rice straw–cement brick that would maintain a
compression stress up to 115kg/cm2 costs 25% less than the similar pure cement
brick available in the market.
Keywords: cements brick, agricultural wastes recycling, chopped rice straw,
cement composites.
Keywords
cements brick, agricultural wastes recycling, chopped rice straw,
cement composites
Related Book
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