Evaluating the cracking resistance of Hot Mix Asphalt modified with calcium lignosulfonate at low and intermediate temperatures

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Document Type : Article

Authors

1 Department of Civil Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

2 Department of Civil Engineering, Iran University of Science and Technology, Tehran, Iran

10.24200/sci.2024.63259.8327

Abstract

One of the common types of failures in asphalt pavements is cracking. Considering the environmental importance of material recycling, in this research, calcium lignosulfonate (CLS) as a waste product of cellulose production, was used as a bitumen additive, and the cracking resistance of semi-circular bending (SCB) samples of asphalt mixtures containing bitumen modified with 5% to 20% CLS was investigated at low and medium temperatures. To measure the performance of asphalt mixtures, the parameters of fracture energy (Gf), fracture toughness (K1c), flexibility index (FI) and cracking resistance index (CRI) were used. Also, rotational viscosity (RV) test was performed to determine the pumpability of bitumens. The results showed that CLS particles can increase the stiffness and viscosity of bitumen in high-temperature conditions. However, it was lower than the maximum allowed amount. At low temperature, with the addition of CLS, K1c and Gf indices were increased, and their highest values were related to bitumen with a 15% additive. At intermediate temperature, Gf index was increased until before the critical load, and FI and CRI were increased up to 15% and then decreased slightly. But Gf index was increased with a decreasing trend after the critical load until the end.

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Scientia Iranica

Articles in Press, Accepted Manuscript
Available Online from 10 September 2024

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