Abstract
An experimental study was carried out to investigate the feasibility of using Strain Hardening Cementitious Composite (SHCC) to upgrade two-way RC slabs deficient in flexural strength. A total of eight full-scale slabs measuring 1500 mm long by 1500 mm wide were constructed and tested to failure. Two specimens were used as control slabs and the other six slabs were strengthened with various configurations of SHCC materials. An innovative Near-Surface Mounted strengthening technique is proposed for the first time in this study to improve the bonding behaviour. The experimental program is described and the main results are presented and discussed in terms of strength, ductility, failure modes and performance of the NSM technique. The results show that not only strengthening schemes based on SHCC configurations have been successful in recovering the flexural capacity of deficient slabs, but also they can be used as repair materials and improve durability of retrofitted slabs. An analytical evaluation also performed to examine the accuracy of the existing models in predicting the maximum strength of the tested slabs. The predictions of the model of Rankin and Long present the best correlation with the experimental values.
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