Studying the Failure Behavior of Cement-fiber-treated Sand under Triaxial Direct Tension Tests

Authors

  • Behzad Isazadeh-Khiav
    Affiliation

    University of Tabriz, Department of Civil Engineering, University of Tabriz, 29 Bahman Blvd, Tabriz 5166616471, Iran

  • Tohid Akhlaghi
    Affiliation

    University of Tabriz, Department of Civil Engineering, University of Tabriz, 29 Bahman Blvd, Tabriz 5166616471, Iran

  • Masoud Hajialilue-Bonab
    Affiliation

    University of Tabriz, Department of Civil Engineering, University of Tabriz, 29 Bahman Blvd, Tabriz 5166616471, Iran

https://doi.org/10.3311/PPci.18469

Abstract

The main goal of this research is to study the failure behavior of cement-fiber-treated sand under triaxial direct tension condition tests. Thus, a new loading system and triaxial cell was designed and built for tensile loading. Samples were prepared with content cement of 3 and 5% (dry wt.) of the sand, while two types of polypropylene fibers 0.024 m in length and 23 μm and 300 μm thick were added at 0.0% and 0.5% (dry wt.) of the sand and cement mixture. After a seven-day curing period, the samples were loaded under triaxial direct tension tests under confining pressures of 100, 200, and 300 kpa in drained conditions. Stress-strain behavior, changes in volume and energy absorbed by cement-fiber reinforced sand were measured and compared with the results of other studies. Adding fibers resulted in reduced peak deviatoric stress and increased residual deviatoric stresses of the cement-fiber reinforced sand, with changes from brittle to ductile behavior. The initial stiffness and stiffness at 50% maximum tensile stress of the samples is decreased with the addition of fibers and with an increase in fiber diameter, the reduction rate of this stiffness is more evident. The absorbed energy for fibers with a thickness of 23 μm is less than fibers with a thickness of 300 μm. The effect of adding fibers to strength parameters showed that the cohesion intercept decreases, while the internal friction angle increases.

Keywords:

cement-treated sand, artificial fibers, triaxial direct tension, strength parameters

Published Online

2022-03-30

How to Cite

Isazadeh-Khiav, B., Akhlaghi, T., Hajialilue-Bonab , M. “Studying the Failure Behavior of Cement-fiber-treated Sand under Triaxial Direct Tension Tests”, Periodica Polytechnica Civil Engineering, 66(2), pp. 384–397, 2022. https://doi.org/10.3311/PPci.18469

Issue

Section

Research Article