Journal
INTERNATIONAL CONFERENCE ON THEORETICAL AND APPLIED PHYSICS (ICTAP 2012)
Volume 1555, Issue -, Pages 67-69Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4820995
Keywords
dispersant; cementitious carbon fiber composites; piezoresistivity; compressive strength
Categories
Funding
- SINas Program
- State Ministry of Research and Technology
- PT
- Indocement Tunggal Perkasa, Tbk
- Research Center for Bridges and Pavements
- Ministry of Public Work for cooperation
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Carbon Fiber Cementitious Composites (CFCC) is one of the most important materials in smart concrete applications. CFCC should be able to have the piezoresistivity properties where its resistivity changes when there is applied a stress/strain. It must also have the compressive strength qualification. One of the important additives in carbon fiber cementitious composites is dispersant. Dispersion of carbon fiber is one of the key problems in fabricating piezoresistive carbon fiber cementitious composites. In this research, the uses of dispersants are methylcellulose, mixture of defoamer and methylcellulose and superplasticizer based polycarboxylate. The preparation of composite samples is similar as in the mortar technique according to the ASTM C 109/109M standard. The additives material are PAN type carbon fibers, methylcellulose, defoamer and superplasticizer (as water reducer and dispersant). The experimental testing conducts the compressive strength and resistivity at various curing time, i.e. 3, 7 and 28 days. The results obtained that the highest compressive strength value in is for the mortar using superplasticizer based polycarboxylate dispersant. This also shown that the distribution of carbon fiber with superplasticizer is more effective, since not reacting with the cementitious material which was different from the methylcellulose that creates the cement hydration reaction. The research also found that the CFCC require the proper water cement ratio otherwise the compressive strength becomes lower.
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