The Effect of Sodium Silicate on the Behaviour of Shotcretes for Tunnel Lining
Journal Title: Journal of Scientific Research and Reports - Year 2017, Vol 14, Issue 2
Abstract
Present case study investigates the rheological, mechanical and in-placing performances of fiber-reinforced shotcrete manufactured with different fibers (steel, glass and polypropylene) and with sodium silicate based set-accelerating admixture for tunnel linings. The study compares the performances of concretes manufactured and fully compacted with those shotcretes which are manufactured directly on the job-site. The influence of sodium silicate accelerator on mechanical and rheological properties of fiber-reinforced shotcretes with respect to reference concrete were evaluated. It was observed that: The addition of fibers does not influence slump and workability retention with respect to reference concrete, independent of type and dosage of fibers; Spraying and set accelerator dosage determined a decrease about of 10-30% in compressive strength compared to that of concrete placed and vibrated without sodium silicate accelerator; The set-accelerating admixture has negative effect on compressive strength of fiber-reinforced shotcrete (15%).
Authors and Affiliations
Luigi Coppola, Alessandra Buoso, Denny Coffetti, Patricia Kara, Sergio Lorenzi, Franco D’Alessandro
Keywords
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- EP ID EP323325
- DOI 10.9734/JSRR/2017/33641
- Views 71
- Downloads 0
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