Paper Details

Self-compacting concrete (SCC) would be an ideal choice for thin structural members with congestedreinforcement as they pass freely and fill the formwork completely without segregation. Four SCC mixes with strengthsof 30 MPa, 40MPa, 50MPa and 60MPa were cast using a rational mix design procedure evolved for SCC mixes usinglow calcium fly ash. The cement content in the mixes varied from 250 Kg/m3to 500kg/m3 while the percentage of fly ashin the mixes varied from 52% to 18% of the binder content. A carboxyl Ted ether based superplasticiser in dosages of0.4% to 0.7% of the binder content was helpful in enhancing the deformability of the mixes. A commercially availableViscosity Enhancing Agent (VEA) with a dosage of 0.1% of binder content was useful in enhancing the thixotropy of themixes. The durability related properties of these mixes such as water permeability, percentage saturated waterabsorption, rapid chloride permeability test (RCPT), sorptivity and shrinkage were evaluated after 28 days of watercuring and presented in the paper. It was observed that high strength SCC showed lower percentage of water absorptionand coefficient of water permeability as compared to low strength SCC. However, based on the RCPT values, SCChaving strengths up to 40 MPa could be categorized as ‘very low’ permeability and above as ‘low’ permeability concreteindicating the high degree of chloride impermeability of low strength mixes. Hence, low strength SCC could also beproportioned to be highly resistant to chloride diffusion. The investigations clearly demonstrated that SCC mixes couldbe considered as highly durable concrete.

Binu Sukumar, Joyson Silva P, “DURABILITY CHARACTERISTICS OF SELF-COMPACTING CONCRETE CONTAINING LOW CALCIUM FLY ASH”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 3, Issue 1, pp. 137-142, January 2016.