01624792

Component

An extended finite element model (XFEM) was constructed to investigate the traffic induced reflective cracking propagation and anti-cracking characteristic of geotextile. Influence factors of tensile modulus and placement location of geotextile were analyzed. A repeated loading test on the material test system (MTS) was utilized in this work to validate the XFEM model. Vehicle load simulations were performed considering single moving load and repeated load which were controlled by DLOAD program and direct cyclic step, respectively. It has been found that single moving load can’t satisfy the crack initiation criterion to induce the reflective cracking, but crack propagation induced by repeated load can be classified into four stages. Geotextile stress over the crack is higher than other zone and 15% of total stress is absorbed by geotextile which reduces crack propagation rate. Tensile modulus with the amount of 50 MPa is the limit for different stages and final crack length, and tensile modulus of 100 MPa is the most suitable to achieve the optimal effect on anti-cracking. Geotextile placed at quarter depth of asphalt layer from the bottom had the best crack resistance. Geotextile placed at one third depth of the asphalt layer from the bottom is also more effective than other two locations along with anti-crack propagation.

This paper was sponsored by TRB committee AFS70 Standing Committee on Geosynthetics. Alternate title: Investigation the Influences of Geotextile on Reducing the Traffic Induced Reflective Cracking Using XFEM.

01618707

17-03776

English

15p

2017

Transportation Research Board 96th Annual Meeting

Digital/other

Figures; Photos; References; Tables

Asphalt pavements; Finite element method; Geotextiles; Reflection cracking; Repeated loads; Simulation; Tensile properties; Traffic loads

Crack propagation

Design; Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2017 Paper #17-03776

TRIS, TRB, ATRI

Dec 8 2016 11:26AM