Pre-mixing step-by-step mixing control method for hot in-plant recycling of old asphalt material

• Main Authors: DONG ZHAO, TAN ZHONGKUN, PAN QINXUE, WU CHAOFAN, FAN LIANG, WANG YAPING, SONG XIAOJIN
• Format: Patent
• Language: Chinese; English
• Published: 13.05.2022
• Subjects: CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES; CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, ORTHE LIKE; FIXED CONSTRUCTIONS; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR

The invention discloses a pre-mixing step-by-step mixing control method for hot in-plant recycling of an old asphalt material, and solves the problem of asphalt aging in the prior art. Comprising two important improvement steps of pre-cooling and carbon fiber yarn cutting, specifically, an old asphalt material is put into a cold water pool, the old asphalt material and cold water are subjected to cold exchange through soaking in cold water, and the temperature of the old asphalt material is reduced to 0-5 DEG C; the new aggregate is put into a first rotary kiln to be heated, the temperature of the heated new aggregate is not lower than 200 DEG C, the optimal temperature is 220 DEG C, RAP is put into a second rotary kiln to be heated, the temperature of the heated RAP is not higher than 80 DEG C, and the regenerated SBS modified old asphalt material modifier and the cut carbon fiber filaments are added into the second rotary kiln to be mixed; the purpose of premixing step-by-step mixing is achieved through mix