TITLE:
Sustainable Construction—Use of Stone Dust as Plasticiser in High Strength SCC with Blended Cement
AUTHORS:
Tahir Kibriya, Leena Tahir
KEYWORDS:
Blended Cements, Stone Dust, Rice Husk Ash, Sustainable Construction, Industrial Waste, Agricultural Waste in Concrete
JOURNAL NAME:
World Journal of Engineering and Technology,
Vol.5 No.3,
July
17,
2017
ABSTRACT: Extensive
growth in the developing countries due to infrastructure development is
resulting into massive consumption of concrete thereby increasing the demand on
concrete materials. Quite large amounts of fine aggregates are required for
concrete in developing countries thus shortages of quality river sand is
putting pressure on availability of fine aggregates. To fulfill the high demand
of fine aggregates, a search for alternative materials is in process. Stone
crushing and processing industry is a large industry which generates large
amounts of stone dust and slurry which is a waste produced from this process.
Tons of such waste generated has no useful purpose except as landfill material.
Some preliminary studies have been conducted into use of marble/ limestone
waste for use in concrete [1] [2].This study aims at using stone dust as partial replacement of sand in
concrete to observe its effects on workability and other mechanical properties.
This would result in useful consumption of this waste product thereby
eliminating environmental issues related to its disposal. Partial replacement
of 10% and 20% sand replacement with stone dust is carried out with the use of
self-compacting concrete with blended cement. Blended cement used contains 50%
rice husk ash and 50% Portland cement. Such high strength SCC with blended
cement containing 50% rice husk ash and 50% Portland cement has already been
tested to provide better quality concrete [3]. Wide ranging investigations covering most aspects of mechanical behavior
and permeability were carried out for various mixes for compressive strengths
of 60MPa & 80MPa. Compressive strengths of high strength SCC with blended cements and
10% and 20% replacement of sand with stone dust for 60MPa and 80MPa were observed to be higher
by about 10% to 13% than the control specimen. Higher elastic moduli and
reduced permeability were observed along with better sulphate and acid
resistance. Better strengths and improved durability of such high strength SCC
make it a more acceptable material for major construction projects thereby
reducing the burden on environment and use of such waste product for a useful
purpose promoting sustainable construction.