▎ 摘　　要

NOVELTY - A sand mastic asphalt concrete composition comprises 10-20 wt.% high grade asphalt binder and 80-90 wt.% fine aggregate. The high-grade asphalt binder comprises 50-60 wt.% petroleum-based asphalt, 5-10 wt.% diisocyanate, 2-5 wt.% polyetherpolyol, 2-5 wt.% secondary amine, 5-10 wt.% polymer modifier, and 1-5 wt.% plastic additive. The petroleum-based asphalt is at least one selected from the group consisting of straight asphalt, cutback asphalt, and/or blown asphalt. The polymer modifier is at least one chosen from styrene-butadiene rubber (SBR), styrene-butadiene-styrene (SBS) block copolymers, styrene-isoprene-styrene (SIS) block copolymers, ethylene-propylene-diene monomer (EPDM), polychloroprene, polynorbonene, polyether-polyamide block copolymer (EBA), styrene-ethylene-butylene-styrene (SEBS), acrylonitrile-butadiene-styrene (ABS), polybutene, methacrylic acid ester, olefin-maleic anhydride copolymer, glycidyl methacrylate, and/or ethylene-propylene copolymers. USE - Sand mastic asphalt concrete composition used for constructing thin layer impermeable composite pavement (claimed) e.g. roads, sidewalks, bridges and airfields. ADVANTAGE - The mastic or goose-based sand mastic asphalt concrete composition exhibits a commonality grade of PG 82-34, which is the highest grade in the PG grade performance of the asphalt binder, high and low temperatures, low-temperature properties to improve pavement durability in winter, excellent plastic deformation resistance, fatigue crack resistance, and high and low temperature crack resistance, excellent waterproof, prevents potholes, and reduces noise. DETAILED DESCRIPTION - A sand mastic asphalt concrete composition comprises 10-20 wt.% high grade asphalt binder and 80-90 wt.% fine aggregate. The high-grade asphalt binder comprises 50-60 wt.% petroleum-based asphalt, 5-10 wt.% diisocyanate, 2-5 wt.% polyetherpolyol, 2-5 wt.% secondary amine, 5-10 wt.% polymer modifier, and 1-5 wt.% plastic additive. The petroleum-based asphalt is at least one selected from the group consisting of straight asphalt, cutback asphalt, and/or blown asphalt. The polymer modifier is at least one chosen from styrene-butadiene rubber (SBR), styrene-butadiene-styrene (SBS) block copolymers, styrene-isoprene-styrene (SIS) block copolymers, ethylene-propylene-diene monomer (EPDM), polychloroprene, polynorbonene, polyether-polyamide block copolymer (EBA), styrene-ethylene-butylene-styrene (SEBS), acrylonitrile-butadiene-styrene (ABS), polybutene, methacrylic acid ester, olefin-maleic anhydride copolymer, glycidyl methacrylate, and/or ethylene-propylene copolymers. The plastic additive is at least one chosen from EVA (Ethylene-Vinyl Acetate copolymer), EMA (Ethylene-Methyl Acetate copolymer), olefin copolymer, 5C petroleum resin, and/or 9C petroleum resin. The fine aggregate has a 5mm sieve pass rate of 95-100%, a 2.5mm sieve pass rate of 65-100%, pass rate of 1.2 mm sieve of 40-80%, and dried (DRI) by mixing in a mixer for 30 seconds to 1 minute with biopolymer and talc by heating fine aggregate with a 0.6mm sieve passing rate of 20-65% and a 0.3 mm sieve passing rate of 7-40% at 160-180° C. The sand mastic asphalt concrete composition has porosity of 1% or less. An INDEPENDENT CLAIM is included for method of constructing a thin layer impermeable composite pavement using the sand mastic asphalt concrete composition, which involves (S10) preparing a sand mastic asphalt concrete composition by mixing a high grade asphalt binder and fine aggregate in a separate plant, (S20) flattening the construction surface and removing impurities from the construction surface to provide a construction portion, (S30) storing and transporting the prepared sand mastic asphalt concrete composition in a mobile storage device, laying to a thickness of 0.5-2 cm on top of the construction portion to form and cure an impervious barrier layer, and (S40) laying and compacting a crushed stone mastic asphalt (SMA) concrete composition to a thickness of 2.5-6.5 cm on top of the constructed impervious barrier layer and curing.