Horning Procedure of Rice Husk and the Influence of Rice Husk Ash on Concrete

This report deals with the evaluation of the influence of burning procedure to the
quality of rice husk ash. Rice hush ash (RHA) has a pozzolanic reactivity characteristic
which can be used to partially replace the cement content. The rice husk ash used is
obtained from controlled auto combustion of rice husk in a closed chamber with control
burning temperature. The understanding on the effect of RHA on the rheology and
workability of fresh concrete is important because RHA can impact the strength and
durability of hardened concrete.
The project focuses on identifying the effect of RHA on workability of the
concrete and the optimum inclusion of RHA in concrete. Several types of burning RHA
are done and tested to know the composition of silicon dioxide, Si02 contained in the
RHA and its influence on the strength of concrete.
This research work also evaluates how different contents of rice husk ash (RHA)
added to concrete may influence its fresh concrete properties. Samples with dimensions
of 15 x 15 x 15 em are tested, with 5%, 10% and 15% replacement of cement with RHA.
The results show that in general, for similar w/c ratio (0.40), the replacement of 15% of
the portland cement by the RHA affect significantly the compressive strength but has no
significant effect on the workability. The results are compared to the control sample and
the viability of adding RHA to concrete is verified.