Despite their wide application as construction materials in various earthworks built by state and local transportation agencies, the role of physical and mechanical factors in the strength and deformation behavior of crushed, manufactured open-graded aggregates (OGAs) is not well studied. In this investigation, the strain rate dependency of strength–deformation behaviors of two commonly employed crushed aggregates with small (12.7 mm) and large (38.1 mm) sizes is investigated. A 150-mm diameter triaxial testing device was used to conduct a drained compression test at five strain rates, ranging from 0.000083%/s to 0.0083%/s. To evaluate the significance of confining stress and density on the effect of strain rates, the shear tests were conducted at 34 kPa and 207 kPa effective confining stress levels, with the samples compacted at loose (30%) and dense (95%) relative densities. The peak friction angle, maximum dilation angle, secant modulus, and axial strain at which the aggregates started to dilate were determined to evaluate the strain rate effect on the shear behavior of OGAs. The results demonstrate that within the imposed quasistatic strain rate ranges, only the dilation angle showed an increasing trend with the increase in strain rate, whereas other extracted strength parameters were less sensitive to strain rate for both OGAs tested. Hence, the selection of strain rates according to ASTM specifications is appropriate for conducting strength parameter tests, used by practitioners for the design of geotechnical structures, on OGAs under quasistatic conditions.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Strain Rate Effect on Shear Behavior of Open-Graded Aggregates


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:


    Publication date :

    2017-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Shear-box tests on graded aggregates

    Pike, D. C. | TIBKAT | 1973


    Repeated load stability of open-graded highway aggregates

    Bathurst, R. J. / Raymond, G. P. / University of Nottingham; Department of Civil Engineering | British Library Conference Proceedings | 1995


    Analysis of Resilient Modulus of Dense- and Open-Graded Aggregates

    Heydinger, Andrew / Xie, Qinglu / Randolph, Brian et al. | Transportation Research Record | 1996


    Analysis of Resilient Modulus of Dense- and Open-Graded Aggregates

    Heydinger, Andrew G. / Xie, Qinglu / Randolph, Brian W. et al. | Transportation Research Record | 1996


    Analysis of Resilient Modulus of Dense- and Open-Graded Aggregates

    Heydinger, Andrew G. | Online Contents | 1996