|
|
|
Title: Modulus of Rubblized Portland Cement Concrete from Surface Wave Testing
Accession Number: 01128668
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: Several Interstate portland cement concrete (PCC) pavement sections in New Jersey are being rubblized by multihead breaker equipment; the rubblized concrete is later compacted by several passes of vibratory Z-grid and rubber-wheel static rollers. To evaluate the modulus of the rubblized PCC and to compare it to the modulus of a typical dense graded aggregate base material, nondestructive evaluation using surface waves, implemented in a portable seismic property analyzer, was conducted. The elastic modulus is evaluated from the average velocity of surface waves, from the shortest measurable wavelength (about 2 in.) to one equal to an approximate thickness of the rubblized concrete (about 10 in.). In addition to the average velocity (modulus), the variation of the surface wave (phase) velocity with wavelength can be related to the variation of modulus with depth. The modulus obtained from seismic testing is a low-strain modulus, and appropriate corrections (reductions) should be provided to describe it as a resilient modulus. The modulus variation is largely constrained between 550 and 2,800 MPa (80 and 400 ksi), with an average modulus between 1,100 and 1,400 MPa (160 and 200 ksi). Significant modulus variation is attributed to the rubblization process, which provides the highest crushing of concrete near the surface; near the bottom, rubblized concrete appears more like fractured rock and can form an uneven interface between the two zones. In general, the modulus of rubblized PCC is higher than the modulus of a typical granular base.
Monograph Title: Monograph Accession #: 01140575
Report/Paper Numbers: 09-0551
Language: English
Authors: Pagination: pp 34-41
Publication Date: 2009
ISBN: 9780309126199
Media Type: Print
Features: Figures
(5)
; Photos
(12)
; References
(14)
; Tables
(1)
TRT Terms: Uncontrolled Terms: Geographic Terms: Subject Areas: Highways; Materials; I33: Other Materials used in Pavement Layers
Files: TRIS, TRB, ATRI
Created Date: Jan 30 2009 4:48PM
More Articles from this Serial Issue:
|
0000-0001-9083-9317