Rheological and Chemical Characteristics of Asphalt Binder Modified with Groundnut Shell Bio-oil

Abstract

Increase in the asphalt binder prices, dwindling crude oil resources, and an enhanced obligation for environmentally sustainable asphalt binder necessitates the exploration of alternate avenues. One such promising approach is the adoption of bio-oil (BO) from biomasses for the production of asphalt binder. This study adopts BO derived from groundnut shell biomass (by fast pyrolysis) for modification of AC30. BO was incorporated in AC30 at varying dosages of 5, 10, and 15 % by weight. The tests performed included carbon, hydrogen, nitrogen, sulfur, and oxygen; Fourier transform infrared (FTIR) spectroscopy; absolute viscosity; softening point; dynamic viscosity; frequency sweep at multiple temperatures; performance grade (PG); multiple stress creep and recovery; and linear amplitude sweep. Both carbon, hydrogen, nitrogen, sulfur, and oxygen and FTIR analysis indicated that BO had caused alterations at the molecular level of AC30. An increase in absolute viscosity and softening point was observed up to a BO dosage of 10 %. Dynamic viscosity was observed to increase until 5 % BO dosage. BO dosages of 10 % and 15 % were observed to increase the high-temperature PG. However, the intermediate temperature grade increased for all BO dosages. Only 15 % BO dosage caused a compromise in the low-temperature PG. Nonrecoverable creep compliance was observed to decrease until the BO dosage of 10 %, indicating an enhancement in rutting resistance. Also, fatigue life was observed to enhance until 10 % BO dosage. Overall, the study indicated that groundnut shell BO can substantially improve the resistance to primary distresses of rutting, fatigue, and thermal cracking. Conclusively, a BO dosage of 10 % was observed to be the most favorable.

Correlation Analysis between Mechanical Properties and Fractions Composition of Oil-Rejuvenated Asphalt

“…Therefore, the mechanical properties of Pio-L and Bio-1 decay rapidly in secondary aging. However, since the aromatic fraction does not contain aging groups [ 91 ], Pio-M and Bio-3, which contain more than 50% aromatic fractions, performed well in long-term aging after the addition of aged asphalt.…”

Future Directions for Applications of Bio-Oils in the Asphalt Industry: A Step to Sequester Carbon in Roadway Infrastructure

“…The effect of groundnut shell bio-oil on the performance of bitumen was examined by Singh, Yenare, and Showkat. 195 They reported that the Delta T Critical (ΔTc) of all dosages of bio-oil modification sustained the m-controlled nature of the base bitumen, and 10% bio-oil improved the relaxation characteristics of the bitumen. Also, the results indicated an enhancement in the recovery potential of bitumen modified by groundnut shell bio-oil.…”

“…The crossover modulus and crossover frequency results showed that the bio-oils were able to increase the crossover modulus and crossover frequency values, indicating improved performance of the bitumen. The effect of groundnut shell bio-oil on the performance of bitumen was examined by Singh, Yenare, and Showkat . They reported that the Delta T Critical (Δ T c) of all dosages of bio-oil modification sustained the m-controlled nature of the base bitumen, and 10% bio-oil improved the relaxation characteristics of the bitumen.…”

Influence of Biomass-Modified Asphalt Binder on Rutting Resistance

“…Furthermore, the Jnr of AC30 decreased with 5% and 10% PSB but increased when the asphalt binder was modified with 15% PSB. Asphalt binder modified with 10% PSB was the most effective in terms of rutting resistance [88]. The wood bio-oil (WBO) was used as a substitute for asphalt binder in flexible pavements.…”