PSI - Issue 42

Martina Drdlová et al. / Procedia Structural Integrity 42 (2022) 1391–1397 Drdlova et al/ Structural Integrity Procedia 00 (2022) 000 – 000

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hydrothermally treated. The samples hydrothermally treated in the same conditions showed similar values of compressive strength, regardless of the preparation method. This can be stated for both quasistatic and high strain rate regimes.

Table 3 High strain rate characteristics of RPC samples prepared and cured under various conditions.

f c s (MPa)

f c dyn (MPa)

Material

Strain rate (s-1)

DIF fc 1.97 1.48 2.09 2.62 1.82 1.62 2.05 2.10 1.78 1.97 1.56 1.45 1.67 1.74 1.79 1.71 1.46 1.79 2.18 1.80 1.99 1.81 1.67 2.08 2.14 2.35 2.03 1.52 2.23 2.05 1.80 2.1 1.9 2.1

RPC

122

2210 1010 2042 2005 1950 2050 1800 2320 2030 1550 2050 1600 2000 2010 2110 2100 2230 2100 2300 1700 2010 2200 2200 1850 1510 1700 2050 1800 2002 2200 2150 2005 2100 2050

240 181 215 320 350 315 305 270 380 390 330 365 210 195 225 235 320 305 260 320 380 395 325 360 270 250 310 320 385 333 250 380 350 305

RPC 180_8

167

RPC 190_40

185

RPC_P

134.8

RPC_P 180_8

178.6

RPC_P 190_40

181

RPC_V

149

RPC_V 180_8

164

RPC_V 190_40

180

The application of additional press during moulding and the setting time did not bring any significant benefit in terms of improvement of mechanical parameters. The observed increase in compressive (both quasistatic and dynamic) and flexural strength was negligible (within the result scatter). The introduction of pressure at setting time is reported by