A STUDY INTO THE PERFOMANCE OF VOLCANIC TUFF AS PARTIAL REPLACEMENT OF RIVER SAND IN PRE-CAST CONCRETE

ABSTRACT
The author intends to investigate the performance of volcanic tuff as a replacement for sand in the
production of concrete and find out its performance in issues relating to compressive strength, density,
particle distribution, flexural strength and tensile strength and its comparison with normal weight
concrete.
Comprehensive experimental investigations were conducted to assess the effect of volcanic tuff on
concretes compressive strength. The experimental program consisted of testing several standard cubes
with zero percent volcanic tuff and a number of standard cubes containing different percentages
volcanic tuff as fine aggregate. Other tests such as tensile strength, slump test, flexural strength test
and specific gravity were also carried out.
Further research has indicated that tuff has shown presence of pozzolana which is a
siliceous/aluminous material which when mixed with lime/calcium hydroxide and water forms
cementatious compound. This was a major background that leads to the belief that if tuff was used as
an aggregate in the production of concrete it would have a significant improvement in the entire
property of concrete.
Tuff concrete is considered to be light weight with a density ranging from 1440-1840kg

Tuff concrete is considered to be light weight with a density ranging from 1440-1840kg/

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