Ad. Mazzatesta et al., EQUATION OF STATE OF CEMENTITIOUS MATERIALS BY ULTRASONIC METHODOLOGY, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 251(1-2), 1998, pp. 121-128
The pressure-volume relationship, i.e. the equation of state, was dete
rmined for mortar and cement paste samples with a range of pore volume
fractions. The equation of state was calculated from the isothermal b
ulk modulus and its pressure derivative. Ultrasonic techniques were us
ed to determine the bulk modulus as a function of hydrostatic pressure
s. The ultrasonic velocities were measured up to 0.241 GPa (35 ksi) in
increments of 0.0345 GPa (5 ksi). The bulk modulus of the mortar and
cement paste samples increased linearly over the examined hydrostatic
pressure range. The pressure derivative of the bulk modulus for each s
ample increased as the pore volume fraction of the samples decreased.
The present work demonstrates the capability to determine the equation
of state of brittle materials by ultrasonic techniques at hydrostatic
pressures. The effect of high strain and high strain rate events, occ
urring in brittle materials, can be modeled with greater accuracy when
incorporating the equation of state. (C) 1998 Elsevier Science S.A. A
ll rights reserved.