Effects of Moist Aggregates on the Performance of Warm Mix Asphalt Mixtures Containing Non Foaming Additives

Volume 39, Issue 5 (September 2011)

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ISSN: 1945-7553
CODEN: JTEVAB
Published Online: 23 May 2011
Page Count: 11

Effects of Moist Aggregates on the Performance of Warm Mix Asphalt Mixtures Containing Non-Foaming Additives

Punith, V. S.
Post-Doctoral Research Fellow, Department of Civil Engineering, Clemson University, Clemson, SC

Xiao, Feipeng
P.E., Research Assistant Professor, Asphalt Rubber Technology Service (ARTS), Department of Civil Engineering, Clemson University, Clemson, SC

Amirkhanian, Serji N.
Consultant, Guest Professor, Key Laboratory of Silicate Materials Science and Engineering of Ministry of Education, Wuhan Univ. of Technology, Wuhan,

(Received 14 October 2010; accepted 18 April 2011)

Abstract

The objective was to conduct a laboratory investigation of moisture susceptibility and rutting resistance of non-foaming warm mix asphalt (WMA) mixtures containing moist aggregates. Gyration number and weight loss of various samples, indirect tensile strength (ITS), tensile strength ratio (TSR), rut depths of dry and moisture conditioned specimens, as well as failed temperatures and rutting factors of recovered binders were measured for all mixtures. The experimental design included two aggregate moisture contents (0 and ∼0.5 % by weight of the dry mass of the aggregate), two lime contents (1 and 2 % lime by weight of dry aggregate) and one liquid anti-stripping agent (ASA), three non-foaming WMA additives (Cecabase^®, Evotherm^®, and Rediset^®) with control, and two aggregate sources. A total of 34 mixtures were designed and a total of 340 specimens were tested in this study. The test results indicated that the aggregate source significantly affects the ITS and rutting resistance regardless of the WMA additive, ASA, and moisture content. In addition, the ITS and rut depth of the non-foaming WMA mixtures containing moist aggregates generally satisfied the demand of pavement without additional treatment. The mixtures with three WMA additives exhibited similar rutting resistance under dry and wet conditions. The liquid ASA, used in this study, for moisture resistance is not recommended to use in WMA mixtures containing moist aggregates as the aggregate is sensitive to moisture.

Keywords:
warm mix asphalt, tensile strength ratio, moisture susceptibility, rutting resistance

Paper ID: JTE103484
DOI: 10.1520/JTE103484
ASTM International is a member of CrossRef.

Author Title Effects of Moist Aggregates on the Performance of Warm Mix Asphalt Mixtures Containing Non-Foaming Additives Symposium , 0000-00-00 Committee D04

		SEDL / Journals / Journal of Testing and Evaluation (JTE) / Citation Page Volume 39, Issue 5 (September 2011) Click here to download this paper now for $25 PDF (972K) View License Agreement ISSN: 1945-7553 CODEN: JTEVAB Published Online: 23 May 2011 Page Count: 11 Effects of Moist Aggregates on the Performance of Warm Mix Asphalt Mixtures Containing Non-Foaming Additives Punith, V. S. Post-Doctoral Research Fellow, Department of Civil Engineering, Clemson University, Clemson, SC Xiao, Feipeng P.E., Research Assistant Professor, Asphalt Rubber Technology Service (ARTS), Department of Civil Engineering, Clemson University, Clemson, SC Amirkhanian, Serji N. Consultant, Guest Professor, Key Laboratory of Silicate Materials Science and Engineering of Ministry of Education, Wuhan Univ. of Technology, Wuhan, (Received 14 October 2010; accepted 18 April 2011) Abstract The objective was to conduct a laboratory investigation of moisture susceptibility and rutting resistance of non-foaming warm mix asphalt (WMA) mixtures containing moist aggregates. Gyration number and weight loss of various samples, indirect tensile strength (ITS), tensile strength ratio (TSR), rut depths of dry and moisture conditioned specimens, as well as failed temperatures and rutting factors of recovered binders were measured for all mixtures. The experimental design included two aggregate moisture contents (0 and ∼0.5 % by weight of the dry mass of the aggregate), two lime contents (1 and 2 % lime by weight of dry aggregate) and one liquid anti-stripping agent (ASA), three non-foaming WMA additives (Cecabase^®, Evotherm^®, and Rediset^®) with control, and two aggregate sources. A total of 34 mixtures were designed and a total of 340 specimens were tested in this study. The test results indicated that the aggregate source significantly affects the ITS and rutting resistance regardless of the WMA additive, ASA, and moisture content. In addition, the ITS and rut depth of the non-foaming WMA mixtures containing moist aggregates generally satisfied the demand of pavement without additional treatment. The mixtures with three WMA additives exhibited similar rutting resistance under dry and wet conditions. The liquid ASA, used in this study, for moisture resistance is not recommended to use in WMA mixtures containing moist aggregates as the aggregate is sensitive to moisture. Keywords: warm mix asphalt, tensile strength ratio, moisture susceptibility, rutting resistance Paper ID: JTE103484 DOI: 10.1520/JTE103484 ASTM International is a member of CrossRef. Author Title Effects of Moist Aggregates on the Performance of Warm Mix Asphalt Mixtures Containing Non-Foaming Additives Symposium , 0000-00-00 Committee D04