Issue 41

L. Zhang et alii, Frattura ed Integrità Strutturale, 41 (2017) 356-368; DOI: 10.3221/IGF-ESIS.41.47 362 Tab. 6 lists the elasticity modulus of shotcrete added with the traditional accelerator obtained by using formula (4). Tab. 7 lists the elasticity modulus of shotcrete added with the new liquid accelerator obtained by using formula (4). Fig. 4 shows the elasticity modulus-time regression curve of shotcrete added with the traditional accelerator. Age Specimen No. 8h/GPa 12h/GPa 1d/GPa 3d/GPa 7d/GPa 28d/GPa 1 7.66 10.82 13.69 17.80 21.90 23.39 2 8.63 11.30 14.37 18.33 21.36 23.76 3 8.45 10.99 13.95 17.99 22.00 24.03 4 7.67 10.47 13.48 18.54 22.53 23.88 5 8.29 11.17 14.72 18.84 21.79 23.58 6 7.80 10.85 13.31 17.84 22.48 24.28 7 8.31 11.34 14.48 18.46 21.65 24.46 8 10.04 11.77 15.27 18.96 22.17 24.77 9 8.83 11.39 14.09 17.85 21.88 24.34 Table 6 : Elasticity modulus of shotcrete added with the traditional accelerator Age Specimen No. 8h/GPa 12h/GPa 1d/GPa 3d/GPa 7d/GPa 28d/GPa 1 11.33 13.17 16.45 20.67 24.16 25.35 2 11.47 13.70 17.48 21.04 23.87 25.53 3 11.44 13.87 16.86 20.84 24.34 25.81 4 10.32 13.36 16.47 21.13 24.58 25.69 5 11.25 13.65 17.79 21.41 24.22 25.60 6 11.06 13.13 16.49 20.61 24.50 25.97 7 11.45 13.89 17.04 20.93 24.03 26.26 8 12.33 14.12 17.61 21.46 24.29 26.46 9 11.57 14.38 16.98 20.55 24.25 26.11 Table 7 : Elasticity modulus of shotcrete added with the new liquid accelerator Take a log-scale for time, get the elasticity modulus-time regression curve of shotcrete with the traditional accelerator and with the new liquid accelerator, as shown in Fig.4. Figure 4 : Elasticity modulus-time regression curve of shotcrete added with accelerator The Elasticity modulus of shotcrete with the traditional accelerator associated with time is determined as