FIELD: road- building. SUBSTANCE: broken rock, sand, mineral powder (8-10%), bitumen, and polymer additive are mixed at 140-160 C. Mixture is cooled to 30-40 C and more (1-4%) mineral powder of bituminous concrete is added, after which resulting concentrate is supplemented by 1-2% of preliminarily prepared polymer additive. The latter contains mineral oil, divinyl-styrene thermoplastic and chloroprene rubber, cationic or anionic surfactant, and bitumen. Concrete is finally composed, %: bitumen, 10-15; polymer, 2-4; surfactant, 0.5-1; and mineral oil, up to 100%. EFFECT: prevented agglomeration on storage and improved consumer's properties. 2 cl, 2 tbl, 3 ex
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Authors
Dates
2000-08-10—Published
2000-01-11—Filed