Document Type : Scientific - Research
Authors
1
Department of Civil Engineering, Shomal University, Mazandaran, Iran
2
Assistant Professor, Faculty of Civil Engineering,, Shomal University, Mazandaran, Amol,
3
PhD Candidate of Road & Transportation Engineering, Department of Civil Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran
Abstract
An efficient approach to preventive maintenance and protection of asphalt pavement is the timely application of microsurfacing surface treatment. The present study was performed to study the feasibility and effectiveness of using waste copper slag powder to replace natural filler in the microsurfacing mixture design in an attempt to evaluate its performance. In this respect, first, characteristics of the aggregate and the waste copper slag powder were investigated. Next, five different microsurfacing mixtures in which the natural filler was replaced by the copper powder at 0, 25, 50, 75, and 100% were used to analyze the performance of the microsurfacing mixtures. Evaluation and comparative analysis of the samples were conducted based on wet cohesion test (30 and 60 min), wet track abrasion test (1 hr), loaded wheel-sand adhesion test, and loaded-wheel-displacement test according to ASTM D6372 standard practice. Results showed that the presence of the waste copper powder improved the microsurfacing performance. Moreover, among the studied samples, the asphalt mixture in which the filler was 100% replaced by the copper powder exhibited the highest performance. Indeed, compared to the non-modified sample (i.e., control), it exhibited 25.8 and 27.3% higher cohesion in the 30- and 60-min wet cohesion tests, respectively, 33% lower sensitivity to wetness, and 30% lower vertical displacement under the effect of traffic load. Compared with the control, the asphalt mixture containing the copper powder at 100% was seen to require 2% lower bitumen emulsion to achieve desired cohesion within a given period of time
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