By Using Waste Glass as Secondary Aggregates in Asphalt Mixtures

The use of primary aggregate in the asphalt mixture layers of a road or airfield pavement is seen as a wasteful use of a finite natural resource. The recycled crushed glass can be considered valuable alternative sources of aggregate for asphalt mixture production. The aim of this study is evaluation the effect of using waste glass as secondary aggregates in asphalt mixtures on Marshall Properties. The study work covers firstly using glass as aggregates including two percentages of glass content (50 and 100 %) by weight of each sieve, and six sizes of glass (1/2, 3/8, No.4, No.8, No.50 and No.200). Secondly, using glass as additives including three percentages of glass content (1, 2 and 4 %) by weight of total mix, and two sizes of glass (No.50 and No.200). The engineering properties of the control and glass mixtures (stability, flow, bulk density, and percent of voids in total mix) were evaluated by Marshall Test. The study results indicated that Marshall Stability for glassphalt is higher than of the control mixture by (127 and 174) % when using glass size (No.8 and No.200) respectively as secondary aggregate in asphalt mixture.