Abstract
A new repair technique consisting on a light jacketing with Fibre Reinforced Cementitious Composites (FRCC) for existing reinforced concrete (RC) buildings has been recently proposed to reduce durability problems of RC members and enhance their capacity. In this work, the effects of FRCC jacketing on the flexural capacity of existing RC columns, with and without a pre-damage, has been evaluated of full-scale specimens under cyclic loading. Digital Imagine Correlation (DIC) was also adopted for understanding the strain distribution in the FRCC jacket. The results shown that the FRCC jacket without a proper anchorage slightly enhanced the flexural capacity of the column. The strengthened column experienced a low damage with respect to control column, but occurrence of premature failures did not allow the achievement of high levels of deformation capacity and ductility.
Highlights
Fibre Reinforced Cementitious Composites (FRCC) jacketing technique for repair and retrofit purposes is rather innovative in this field and still under investigation
Three experimental tests on full-scale reinforced concrete (RC) columns were performed in order to evaluate the effectiveness of two different FRCC jacketing solutions; the experimental data were analysed by using Digital Imagine Correlation (DIC) technique
Two full-scale RC columns were tested under cyclic loading and three configurations were investigated: (i) bare column; (ii) repaired column with FRCC jacketing after pre-damage; (iii) strengthened column with FRCC jacketing without pre-damage
Summary
FRCC jacketing technique for repair and retrofit purposes is rather innovative in this field and still under investigation. FRCCs are cement-based materials with very small aggregates, which contain high strength discrete micro steel fibres and a minimum water/cement ratio. In addition to unique tensile capacity and high compressive strengths, FRCCs have favourable flow properties (as Self Compacting Concrete that can be poured into narrow gaps between formworks and existing element) that make them ideal candidates for creating thin layers of external high-performance jacketing. FRCCs are characterized by high compressive strengths (ranging between 120 and 150 MPa), residual tensile strengths and a softening post-cracking behaviour.
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