Evaluation of Rheology and Moisture Susceptibility of Asphalt Mixtures Modified with Low Density Polyethylene

U. Bagampadde ； D. Kaddu ； B. M. Kiggundu

《International Journal of Pavement Research and Technology》 6卷3期 (2013/05) Pp. 217-224

https://doi.org/10.6135/ijprt.org.tw/2013.6(3).217

並列摘要

This study evaluated rheological properties of low density polyethylene (LDPE) modified asphalts using conventional methods (penetration, softening point and rotational viscosity) and dynamic mechanical analysis (DMA). In addition, Marshall Properties and moisture damage of mixtures from these asphalts and four aggregates were studied using ASTM D1559 and ASTM D4867. LDPE modification improved asphalt temperature susceptibility. Practical LDPE dosages obtained were 2.5% and 3.0% (w/w) for 60/70 and 80/100 asphalts, respectively. LDPE addition slowed down approach of asphalt to a pure viscous liquid while increasing complex modulus at high temperature. The modified asphalts exhibited pseudo-plasticity and LDPE reduced shear susceptibilities of 60/70 and 80/100 asphalts by 16% and 34%, respectively. Modified mixtures exhibited stability increase to a maximum followed by a decrease possibly because of stretching of asphalt by LDPE. The total voids in mix remained within 3-5% for LDPE dosages between 0 and 3%. Limestone mixtures resisted moisture damage, while pumice behavior was asphalt specific. Neat granite and quartzite mixtures did not resist moisture damage though LDPE made them resistant.

並列關鍵字

Aggregate ； Asphalt ； Moisture ； Polyethylene ； Rheology

參考文獻

Mahabir, P. and Mayajit, M. (2002). Utilization of Reclaiming Polyethylene in Bituminous Paving Mixtures, Journal of Materials in Civil Engineering, 14(6), pp. 527-530

Punith, V.S. and Veeraragavan, A. (2007). Behavior of Asphalt Concrete Mixtures with Reclaimed Polyethylene as Additive, Journal of Materials in Civil Engineering, 19(6), pp. 500-507

Monica, R.S.F., Maria, M.F.C., and Leni, F.M.L. (2008). Rheological Evaluation of Polymer Modified Asphalt Binders, Materials Research, 11(3), pp. 381 – 386.

Bagampadde, U., Isacsson, U., and Kiggundu, B.M. (2004). Classical and contemporary aspects of stripping in bituminous mixtures – state of the art, Road Materials and Pavement Design. 5(2), pp. 7-43.

Isacsson, U. and Lu, X. (1995). Testing and Appraisal of Polymer Modified Road Bitumens – State of the Art. Materials and Structures, Vol. 28, pp. 139 – 159.