Title:
Nondestructive Evaluation of Polyester Polymer Concrete
Author(s):
Syam K. Mantrala and C. Vipulanandan
Publication:
Materials Journal
Volume:
92
Issue:
6
Appears on pages(s):
660-668
Keywords:
damping; esters; impacg resistance; modulus of elasticity; nondestructive tests; poisson ratio; polymer concrete; ultrasonic tests.
DOI:
10.14359/9786
Date:
11/1/1995
Abstract:
Nondestructive tests are becoming popular in rapidly evaluating the properties of construction materials. In this study, the applicability of the impact resonance method and the ultrasonic pulse velocity method to polyester polymer (compressive strength of 110 MPa) and polymer concrete (compressive strength of 58 MPa) was investigated. The effect of specimen shape and size on the dynamic moduli, damping ratio, and pulse velocity were studied. The response of cylinders (length-to-diameter ratio 2 and 3) and prisms (length-to-width ratio 2.5 and 4.5) in the three fundamental modes of vibration, namely, longitudinal, transverse, and torsional, were investigated. From the longitudinal and transverse resonant frequencies, the dynamic Young’s modulus of elasticity (Ed) and damping ratio (D) were determined. Using the torsional resonant frequency, the dynamic modulus of rigidity (Gd) and dynamic Poisson’s ratio (IQ) were determined. Using the ultrasonic method, the pulse velocity in polymer (P) and polymer concrete (PC) was measured at frequencies of 50 and 150 kHz. The dynamic modulus of elasticity (Ep) was also determined from the pulse velocity and compared to the static modulus (Es). The dynamic modulus of elasticity for PC (EdpC ) agreed well with the static modulus (Espc ) for all the shapes and sizes investigated. The average dynamic Poisson 's ratio (Vdpc ) was 0.22, as compared to the static value (v:' ) of 0.20. The dynamic modulus of rigidity (Gd c! ) was independent of specimen shape. For polymer the pulse velocity (VF ) was independent of specimen size and testing frequency. The average pulse velocities of polymer and PC were 2450 and 3425 m/s, respectively. The modulus of elasticity (EF ) was IO percent hig:$r than the static modulus (E,PC ) for PC cylinders. The dynamic modulus (EP ) from pulse velocity measurements was as sensitive as the static modulus to changes in density and specimen size. The average damping ratios ofpolymer and PC were I. I and 0.6 percent, respectively.