ASH- AND MINERAL COMPOSITION USED FOR ROADBEDS Russian patent published in 2009 - IPC E01C3/04 

FIELD: construction industry.

SUBSTANCE: invention refers to construction industry, and namely to ash- and mineral compositions used for roadbeds, and can be used in road construction industry. Ash- and mineral mixture consists of sand with particle size of up to 3 mm and crushed stone screenings with particle size of up to 10 mm, which are used as filler; ash obtained from burnt sewage sludge with specific surface area of 200-300 m²/kg, with bulk density of 0.7-0.8 g/m³, SiO₂ - 50-60%, and pH 12-13.5, is used as ash, and bitumen and cement are used as bonding agents. Component ratio is as follows, wt %: sand with particle size of up to 3 mm - 10-18; crushed stone screenings with particle size of up 10 mm - 10-15; ash obtained from burnt sewage sludge - 35-55; oil road bitumen - 5-10; portland cement not less than 400 - 6-12; and water - 15-20% of mixture mass.

EFFECT: enlarging raw-material base of road construction industry owing to utilising burnt sewage sludge ash in ash- and mineral mixture.

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