Low temperature cracking performance of WMA with the use of the Superpave indirect tensile test


Das P. K., TAŞDEMİR Y., Birgisson B.

CONSTRUCTION AND BUILDING MATERIALS, vol.30, pp.643-649, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 30
  • Publication Date: 2012
  • Doi Number: 10.1016/j.conbuildmat.2011.12.013
  • Journal Name: CONSTRUCTION AND BUILDING MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.643-649
  • Keywords: Low temperature cracking, Wax, Warm mix asphalt, Superpave IDT, HMA fracture mechanics, ASPHALT, WAX
  • Yozgat Bozok University Affiliated: Yes

Abstract

Low temperature cracking of wax modified bitumen and asphalt mixtures were studied using the Dynamic Shear Rheometer (DSR), Bending Beam Rheometer (BBR), Superpave IDT and Thermal Stress Restrained Specimens Test (TSRST). Two types of commercial waxes (FT-paraffin and Asphaltan-B) were added to 70/100 penetration grade bitumen. Hot Mix Asphalt (HMA) fracture mechanics was used to determine fracture parameters. Master curves obtained from DSR and BBR test results showed stiffening effect due to wax additive at low temperature. The analysis of covariance was performed using a General Linear Model (GLM) on the Superpave IDT test results for Energy Ratio (ER) by using SPSS (Statistical Program for Social Sciences). Statistical analysis of Superpave IDT results showed a minor negative effect of wax modification at lower temperatures. Statistical analysis also showed that fracture parameters are highly temperature dependent and the two types of aggregate used did not play any significant role in low temperature cracking performance. Results obtained from TSRST tests indicate wax modification has a minor negative effect in low temperature cracking performance of asphalt mixtures. (C) 2011 Elsevier Ltd. All rights reserved.