EFFECT OF METAKAOLIN ON HARDEN PROPERTIES OF C&D WASTE AGGREGATE CONCRETE.

Abstract

Huge quantities of construction and demolition wastes are generated every year in developing countries like
India. The disposal of this waste is a very serious problem because it requires huge space for its disposal and very little
demolished waste is recycled or reused. In manufacturing of concrete aggregates are provide about 75% of the body of
concrete. The effect of partial replacement of coarse aggregate by demolished waste on workability and compressive strength
of recycled concrete for the study at 7 and 28 d. The compressive strength thus, observed was compared with strength of
conventional concrete. Test results showed that the compressive strength of recycled concrete up to 30% coarse aggregate
replacement (C. A. R.) by demolished waste at the end of 28 d has been found to be comparable to the conventional concrete.
The literature study says the decrease the tested data when increase the percentage of recycled course aggregate. So, used
Metakaolin as a cement replacement for increase the result of concrete. Metakaolin is obtained by the calcination of
kaolinite. It is being used very commonly as pozzolanic material and has exhibited considerable influence in enhancing the
mechanical and durability properties of concrete. Various test performed, 10% cement replaced by Metakaolin and then
25%, 50%, 75%, and 100% Natural coarse aggregate replaced with C&D Waste coarse aggregate.