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Research Article Open access CC BY 4.0

The Effect of Sodium Silicate on the Behaviour of Shotcretes for Tunnel Lining

Luigi Coppola, Alessandra Buoso, Denny Coffetti, Patricia Kara, Sergio Lorenzi, Franco D’Alessandro

Journal of Scientific Research and Reports · pp. 1–8 · Published 10 May 2017

10.9734/JSRR/2017/33641

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%).

Sodium silicate based set-accelerating admixture mechanical and rheological properties.

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