EXPERIMENTAL INVESTIGATION ON PARTIAL REPLACEMENT OF TERRAZZO WASTE AS FINE AGGREGATE AND POTTERY WASTE AS FILLER ON PERFORMANCE OF HOT MIX ASPHALT

Abstract

In Ethiopia, the use of naturally occurring aggregates in hot-mix asphalt concrete is becoming unsustainable. Due to the scarcity and limitations of natural resources, there has been significant growth in demand for recycled materials in construction. Thus the researcher explores sustainable alternative materials, such as terrazzo waste as fine aggregate and earthenware pottery waste as filler material in hot mix asphalt concrete production. This experimental study conducted several laboratory tests and use a purposive sampling technique to examine the physical properties of terrazzo waste fine aggregate and earthenware pottery waste filler material. Laboratory tests, namely Marshal stability and flow, volumetric properties, and moisture susceptibility using the Immersion Mechanical test, were conducted to evaluate the properties of the mix. The Optimum Bitumen Content was determined by using appropriate percentages of naturally crushed coarse and fine aggregates, crushed stone dust filler, and different percentages of bitumen binder. The OBC was found to be 5.2% by weight of the total mix. The Marshal properties of the HMA mixture were studied using (5%, 10%, and 15%) percentages of terrazzo-pottery waste aggregate. The most suitable TPW aggregate for hot mix asphalt was identified as TPW5 (10%, 5%) by weight of aggregate. Moisture susceptibility of HMA was also investigated by using an Immersion Mechanical test to check whether the mix is sensitive to moisture damage or not as compared to the control mix. Except for TPW 8, 9, and 10 mixes, the HMA mixture maintained sufficient strength against moisture susceptibility. The TPW5 mixture shows an improvement in the marshal properties of HMA concrete with a marshal stability of 12.83 KN, in contrast to TPW1's (control mix) 11.94 KN. The investigation indicates that TPW5 exhibits slightly higher pavement performance in resisting deformation due to its higher MQ value of 4.76 KN/mm compared to TPW1's value of 4.38 KN/mm. Therefore utilizing TPW5 (10%, 5% optimum mix) in the production of HMA reveals comparable properties to the control mix with certain enhancements and reduces the cost of disposal, and promotes waste aggregate sustainability