THE STRENGTH AND CONSISTENCY OF SELF COMPACTING CONCRETE BY RICE HUSK ASH AS ADDITIVE
Abstract: Self-compacting
concrete (SCC) is a flowing concrete mixture that is able to consolidate under
its own weight. Many countries have the problem of shortage of conventional
cementing materials. Recently there is
considerable efforts worldwide
by utilizing indigenous and waste
materials in concrete. One of such materials
is the rice
husk which under controlled burning. Rice Husk Ash
(RHA), produced after the burning of Rice husks (RH) has high reactivity and
pozzolanic property. The use of RHA in this experiment is expected to determine
the effect of RHA on Self Compacting Concrete.
The use of Rice Husk Ash of Self Compacting Concrete as a matrix cannot
increase the compressive strength of the SCC. Highest value obtained at RHA 0%
of 27.18 MPa and RHA 20% of 22.08 MPa. Silica (SiO2) content in RHA of 82.59%
(due to uncompleted burning) showed insufficient standard value required to
produce optimal CSH bond on concrete,
which is silica content of at least 85% to increase the strength of
concrete. Temperature reaction increases due to the increasing of calcium
oxide. This condition makes more calcium hydroxide released by cement when
cement reacts with water. With the higher of calcium hydroxide so that the
adhesion of cement will be reduced and makes the structure weaker and then
cause a lower compressive strength.
Author: Khalid Soliman Ahmad,
Kristiawan, Sholihin AS
Journal Code: jptsipilgg140017
