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Stone mastic asphalt (SMA), also called stone-matrix asphalt, was developed in Germany in the 1960s with the first SMA pavements being placed in 1968 near Kiel. It provides a deformation-resistant, durable surfacing material, suitable for heavily trafficked roads. SMA has found use in Europe, Australia, the United States, and Canada as a durable asphalt surfacing option for residential streets and highways. SMA has a high coarse aggregate content that interlocks to form a stone skeleton that resists permanent deformation. The stone skeleton is filled with a mastic of bitumen and filler to which fibres are added to provide adequate stability of bitumen and to prevent drainage of binder during transport and placement. Typical SMA composition consists of 70−80% coarse aggregate, 8−12% filler, 6.0−7.0% binder, and 0.3 per cent fibre.
Method for producing a stabilizing additive for crushed stone-mastic asphalt concrete
This utility model relates to road construction, specifically to stabilizing additives for stone mastic asphalt concrete mixtures. A cellulose stabilizing additive is proposed, obtained from waste paper by treatment with a solution of sodium dodecyl sulfate and sodium hypochlorite, followed by washing, drying, and grinding. The additive is added to the stone mastic asphalt concrete mixture at a rate of 0.4–0.8% by weight. The objective of the invention is to obtain a stabilizing additive for a crushed stone-mastic asphalt concrete mixture, which allows for a reduction in the runoff of the bitumen binder and an increase in the stability of the coating using a simplified technology for its production. The technical result consists in reducing the flow rate of the bitumen binder, increasing the resistance of the stone-mastic asphalt concrete mixture to rutting and improving the strength characteristics of the coating while eliminating an additional binding component and simplifying the technology for producing the additive. This technical result is achieved by the fact that the stabilizing additive is cellulose fibers obtained from paper waste by treatment with a solution of sodium dodecyl sulfate and sodium hypochlorite, followed by washing, drying and grinding, while the additive is introduced into the stone mastic asphalt concrete mixture in an amount of 0.4–0.8 wt.%.
Owner:NON PROFIT JOINT CO KAZAKH NAT RES TECH UNIV NAMED AFTER K I SATPAYEV