Issue 41

L. Zhang et alii, Frattura ed Integrità Strutturale, 41 (2017) 356-368; DOI: 10.3221/IGF-ESIS.41.47

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 2 3 4 5 6 7 8 9

7.66 8.63 8.45 7.67 8.29 7.80 8.31

10.82 11.30 10.99 10.47 11.17 10.85 11.34 11.77 11.39

13.69 14.37 13.95 13.48 14.72 13.31 14.48 15.27 14.09

17.80 18.33 17.99 18.54 18.84 17.84 18.46 18.96 17.85

21.90 21.36 22.00 22.53 21.79 22.48 21.65 22.17 21.88

23.39 23.76 24.03 23.88 23.58 24.28 24.46 24.77 24.34

10.04 8.83

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 2 3 4 5 6 7 8 9

11.33 11.47 11.44 10.32 11.25 11.06 11.45 12.33 11.57

13.17 13.70 13.87 13.36 13.65 13.13 13.89 14.12 14.38

16.45 17.48 16.86 16.47 17.79 16.49 17.04 17.61 16.98

20.67 21.04 20.84 21.13 21.41 20.61 20.93 21.46 20.55

24.16 23.87 24.34 24.58 24.22 24.50 24.03 24.29 24.25

25.35 25.53 25.81 25.69 25.60 25.97 26.26 26.46 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

362