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%).

(2017). The Effect of Sodium Silicate on the Behaviour of Shotcretes for Tunnel Lining [journal article - articolo]. In JOURNAL OF SCIENTIFIC RESEARCH AND REPORTS. Retrieved from http://hdl.handle.net/10446/117768

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

Coppola, Luigi;Buoso, Alessandra;Coffetti, Denny;Lorenzi, Sergio;
2017-01-01

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%).
articolo
Coppola, Luigi; Buoso, Alessandra; Coffetti, Denny; Kara, Patricia; Lorenzi, Sergio; D'Alessandro, Franco
(2017). The Effect of Sodium Silicate on the Behaviour of Shotcretes for Tunnel Lining [journal article - articolo]. In JOURNAL OF SCIENTIFIC RESEARCH AND REPORTS. Retrieved from http://hdl.handle.net/10446/117768
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10446/117768
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