Effects of copper slag and recycled concrete aggregate on the properties of CIR mixes with bitumen emulsion, rice husk ash, Portland cement and fly ash

Published Date
15 October 2015, Vol.96:172–180, doi:10.1016/j.conbuildmat.2015.08.021

Title 
Effects of copper slag and recycled concrete aggregate on the properties of CIR mixes with bitumen emulsion, rice husk ash, Portland cement and fly ash

• Author 

• Ali Behnood ^a,,
• Mahsa Modiri Gharehveran ^a,
• Farhad Gozali Asl ^b,
• Mahmoud Ameri ^b,

• aLyles School of Civil Engineering, Purdue University, 550 Stadium Mall Dr., West Lafayette, IN 47907-2051, USA
• bSchool of Civil Engineering, Iran University of Science and Technology, P.O. Box 16489, Narmak, Tehran, Iran

Received 1 April 2015. Revised 21 July 2015. Accepted 5 August 2015. Available online 9 August 2015.

Highlights

• •
  The feasibility of the use of copper slag and recycled concrete aggregate as substitutes for virgin aggregates in CIR mixes was investigated.
• •
  Effects of different additives such as Portland cement, FA, and RHA were studied.
• •
  Copper slag and different additives improved the durability and mechanical properties of CIR mixes.
• •
  Recycled concrete aggregate was found to be acceptable type of aggregate as a substitute for virgin aggregate in CIR mixtures.
• •
  Hazardous environmental effects were not observed.

Abstract

Construction and maintenance of roads require a large volume of aggregates for use in base, sub-base and surface layers. At the same time, the expansion of asphalt roadways results in the production of a large amount of asphalt road waste, known as reclaimed asphalt pavement (RAP). This paper aims to investigate the feasibility of the use of copper slag and recycled concrete aggregate (RCA) as substitutes for virgin aggregates in modifying the gradation of cold recycled mixes made with RAP material. In addition, the effects of three types of additives including Portland cement, fly ash, and rice husk ash on the properties of recycled mixtures were investigated. Marshall, Indirect tensile strength, resilient modulus, moisture susceptibility, and dynamic creep tests were conducted to evaluate the mechanical properties of the mixes. Toxicity characteristic leaching procedure was used to assess the environmental impacts of copper slag. The use of copper slag had better results than limestone and RCA probably due to better interlocking and superior physical and mechanical properties. With regard to the effects of additives, Portland cement was found to be the most effective additive. The difference between fly ash and rice husk ash was found to be statistically insignificant.

Keywords

• Cold in place recycling
• Copper slag
• Recycled concrete aggregate
• Rice husk ash
• Fly ash
• Asphalt emulsion.

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• ⁎ 
  Corresponding author.

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