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The Effect Of Substitution And Admixture Materials On Self-Compacting Concrete (SCC) Characteristics
[Full Text]
AUTHOR(S)
Ganda Anderson, Maulid Muhammad Iqbal, Imron Fikri Astira
KEYWORDS
self-compacting concrete, foaming agent, fly-ash, silica fume
ABSTRACT
The admixture modification by adding foaming agent can overcome the problem of high SCC viscosity. The use of foaming agent has double effects on the concrete admixture in which, to meet the characteristic of concrete admixture flow, foaming agent takes a role in increasing the concrete admixture viscosity, and the use of foaming agent can affect the value of concrete compressive strength. However, it is necessary to control the use of foaming agent on the concrete admixture. The decrease of concrete compressive strength using foaming agent from 50 MPa job mix design towards the concrete designed without pozzolan has 42.51 MPa of concrete compressive strength value causing decline to 7.49 MPa. Therefore, to overcome the decrease of concrete compressive strength value used, powder materials in a form of silica fume and foaming agent are added. To determine the ratio of adding additional substances, variations of using silica fume and foaming agent with the percentage of 5%, 10%, and 15% is used. Then, one of the ways to overcome the bad impact of the foaming agent use is by substituting half of the cement with pozzolan in the form of fly-ash and silica fume. The fine grains of these pozzolans can increase the cohesion on the fresh concrete and decrease bleeding. However, the portion of both pozzolans should be in a proper ratio so that it will not decrease the concrete viscosity towards the characteristic of SCC due to the fact that pozzolan can absorb water easily. In this case, the maximum value of concrete compressive strength on silica fume admixture is 58.97 MPa and on fly-ash is 54.90 MPa. However, the pozzolan addition of fly-ash or silica fume admixture has maximal limitation use on concrete admixture. The maximal ratio of pozzolan addition is 10% of the cement weight. Pozzolan addition which is more than 10% can affect the compressive strength and the characteristics of SCC.
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