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The acid sludge, which was obtained from the recovery of used oil, was disposed through an in situ mixing with styrene–butadiene–styrene (SBS) modifier during its neutralization reaction to afford an usable road paving material. Different contents of SBS (1.0%, 2.0%, 4.0%, and 6.0% by weight of asphalt) were blended, respectively, with an contrast industrial 70/100 paving grade asphalt and the neutralizing...