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Table 2 Flexural strengths (Rf) at the fracture point obtained on the starting and doped (+ 5 and + 10% of graphite powder) bentonitic grouts

From: Doped bentonitic grouts for implementing performances of low-enthalpy geothermal systems

  Ff (N) Rf (N/mm2)
Pure starting material
 June 30, 2016 (14 days) 490 1.84
 July 14, 2016 (28 days) 500 1.88
 July 14, 2016 (28 days) 560 2.10
Starting material + 5%
 June 30, 2016 (14 days) 930 3.49
 July 14, 2016 (28 days) 980 3.68
 July 14, 2016 (28 days) 1080 4.05
Starting material + 10%
 June 30, 2016 (14 days) 820 3.08
 July 14, 2016 (28 days) 1060 3.98
 July 14, 2016 (28 days) 1000 3.75
  1. Ff indicates the load applied at the center of the sample at the fracture point. Dates indicate times between preparation and realization of the mechanical tests (at 14 and 28 days)