The invention discloses composite modified bio-based hydraulic
asphalt concrete and a preparation method thereof, and belongs to the technical field of
hydraulic engineering materials. The concrete is prepared from 8 to 12 parts of
asphalt binder, 50 to 65 parts of
basalt-quartzite composite coarse aggregate, 20 to 35 parts of
machine-made sand-rubber
powder fine aggregate, 5 to 10 parts of mineral filler, 0.5 to 3 parts of composite modifier, 0.8 to 1.2 parts of warm mixing agent and 0.5 to 1.5 parts of
organosilicon waterproofing agent. Waste
vegetable oil is innovatively adopted to be subjected to epoxidation treatment to prepare a bio-based regenerated
asphalt plasticizer (the
epoxy value is 4.5-6.0%), the bio-based regenerated asphalt
plasticizer,
nano silicon dioxide and
polyester fibers are compounded according to the ratio of (1-3): (2-4): (0.5-1.5) to form a synergistic modification
system, and the mixing temperature is reduced by 20-30 DEG C in combination with an alkylamine salt /
fatty acid amide warm mixing agent. Through
basalt-quartzite (7-9: 1-3) discontinuous grading design and rubber
powder (3-8%) elasticity enhancement, the product has high rutting resistance (dynamic stability is greater than or equal to 4200 times / mm), excellent low-temperature
crack resistance (
bending strain is greater than or equal to 2900 mu epsilon) and
environmental protection characteristics, carbon emission is reduced by 60%, the quartzite
utilization rate reaches 30%, and the product is suitable for green
road engineering construction.