TY - JOUR ID - TI - EFFECT OF ADDITIVE MATERAILS IN MINIMIZING تأثير المواد المضافة في تقليل الشقوق الانعكاسية AU - DR. GANDHI GANEM SOFIA HANAA KHALEEL A. AL-BAITI PY - 2009 VL - E IS - first conf./ eng. coll. SP - 746 EP - 760 JO - Iraqi journal of mechanical and material engineering المجلة العراقية للهندسة الميكانيكية وهندسة المواد SN - 20761819 AB - Reflection cracks through a road structure is one of the main causes ofpremature pavement deterioration which which shortens the service life of overlays. This phenomenon, which often appears when a layer of asphaltic material isplaced on top of a discontinuous base, can have many different aspects, in accordancewith the large number of factores governing the mechanism of crack initiation andpropagation through a road structure. A number of additives appear to be promising in plying an important role inimproving the properties and performance of paving mixtures. Wheel tracking testing techniques were developed to examine one type with different contents of asphalt modifier additives (High-density polyethylene) overlaysfor situations where reflection cracking may normally developed. The prime objective of this research is to investigate the potential role of HighDensityPolyethyleneasadditivein retardingorminimizingreflectivecracking.Atotalof120 MarshallSpecimensispreparedandtestedbyMarshall,IndirecttensileandCreeptestsatdifferenttemperaturedecrease.Tosimulatetheoverlayperformanceundera rollingtire,18compactedasphaltconcretebeamsamplesaretestedusingwheeltrackingapparatusaftermodification.Itcanbeconcludedthatmodifiedmixeswith9%ofHigh-DensityPolyethylene(bywt.ofasphalt)givesthemaximumresistancetoreflectioncracking.

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