Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 30, No. 11 (November 2017) 1518-1527    Article in Press

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  COMPARISON OF PERMEABILITY AND DRYING SHRINKAGE OF SCC ADMIXED WITH WOLLASTONITE MICRO FIBER AND FLYASH
 
SHASHI K. SHARMA, G.D. RANSINCHUNG R.N. and P. KUMAR
 
( Received: June 22, 2017 – Accepted: September 08, 2017 )
 
 

Abstract    Cement substitution in self compacting concrete (SCC) is emphasized to conserve environment, reduce cost and utilize waste materials. This paper focuses on comparing the permeability and drying shrinkage of SCC containing Wollastonite micro fiber (WMF), a cheap pozzolanic fiber with respect to flyash. Microsilica was added for providing required viscosity to maintain homogeneity of the mixes. Trials to check flowability, passability and segregation resistance were conducted on binary, ternary and combined mixes of binder material. Results showed that drying shrinkage reduced by 49% for WMF reinforced concrete, whereas it increased by 1.25% for flyash’s ones as compared to normal concrete. Permeability coefficient decreased by 82% and 74%, respectively. Capillary voids influenced the permeability of hardened concrete but drying shrinkage was largely influenced by the rate of gain of tensile strength and expanding ettringite. Notably, flyash is not a reliable admixture for controlling drying shrinkage of high flow concretes.

 

Keywords    permeability, self compacting concrete, drying shrinkage, flyash, micro fiber

 

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