RU2426704C2 - Method to make crushed stone and mastic asphalt concrete mixture with addition of limestone grinding siftings of brand 400 - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method to produce crushed stone and mastic asphalt concrete mixture with addition of limestone grinding siftings of brand 400, includes preparation of crushed stone and mastic mixture to arrange upper layer of a coating, which consists of the following components, wt %: crushed stone of solid rocks - 72.5…73.5, viscous bitumen or PEV - 5.5…7.5 (over 100%). Besides, limestone grinding siftings of brand 400 are added into mineral part of asphalt concrete mixture in amount of 26.5…27.5 wt %.

EFFECT: higher ultimate crushing strength, water resistance ratio and lower water saturation.

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Description

The invention relates to road construction, and in particular to a technology for the preparation of crushed stone-mastic asphalt concrete mixtures for the device of the upper layer of road surface coating.

As a prototype, the technical solution described in GOST 31015-2002 was selected, where the preparation of hot crushed stone and mastic asphalt concrete mixes of the grades SCHMA-10, SCHMA-15 and SCHMA-20 for the device of the top layer of the coating of road pavements is disclosed. The composition of the mixtures according to a known solution is as follows,% mass .:

crushed stone of strong breeds fr. 5 ... 10, or 5 ... 15, or 5 ... 20 mm - 55 ... 95;

crushed sand (screenings of crushing of hard rocks) - 5 ... 30;

mineral powder - 10 ... 20;

stabilizing additive (cellulose fiber 0.1 ... 2.0 mm long (Topsel, Viatop-66, etc.)) - 0.2 ... 0.5 (over 100%);

viscous bitumen or PBB - 5.5 ... 7.5 (over 100%).

The composition of the mixtures according to the proposed solution is as follows,% mass .: crushed stone of strong rocks fr. 5 ... 10, or 5 ... 15, or 5 ... 20 mm - 72.5 ... 73.5; screenings for crushing limestones of brand 400 - 26.5 ... 27.5 and viscous bitumen or PBB - 5.5 ... 7.5% (the latter is over 100%).

The technical result is to increase the compressive strength at + 20 ° C and + 50 ° C and, accordingly, the heat resistance of the water resistance coefficient and reduce water saturation. The increase in thermal stability of alkali alkali metal oxide with ODI is explained by the transfer of the binder in the structure of the material into a bound (oriented) state by small fractions of the ODI. At the same time, cheaper work is achieved by replacing expensive - crushed sand of strong rocks, limestone mineral powder and a stabilizing additive with an inexpensive material - screenings of crushing limestone brand 400 (ODI).

The method is as follows.

Crushed stone mastic asphalt mixture is prepared in a commercially available stationary asphalt concrete plant equipped with a device for heating, dewatering, feeding the components into the mixer and mixing them.

The components of the mixture after heating to operating temperatures, dehydration and dosing, in accordance with the recipe, are mixed together at operating temperatures and the mixture is given to the consumer.

Examples of specific performance of the proposed method are given in table 1, the grain composition of the ODI is in table 2 and the properties of the obtained SchMAS and SchMA in table 3. Moreover, standard cylindrical samples were manufactured and tested according to standard methods GOST 12802-98 “Materials based on organic binders for road and airfield construction. Test Methods. "

table 2 Grain composition ODI Size of sieves, mm 10 5 2.5 1.25 0.63 0.315 0.16 0,071 less than 0,071 the amount Private balances,% 2.0 2.5 19.5 6.5 14.5 12.0 10.0 3,5 29.5 100.0

Sources taken into account

1. GOST 31015-2002. Mixes asphalt concrete and asphalt concrete mastic. Technical conditions - M .: MNTKS, 2003 (Entered into force on May 1, 2003. As the state standard of the Russian Federation by Resolution of the Gosstroy of Russia dated April 5, 2003 No. 33).

2. Patent for the invention of the Russian Federation. The method of construction of the protective layer of the road surface: RU 2305726 C1, E01C 11/24, 09/10/2007.

3. Guidelines for the construction of road asphalt pavements. - M.: SoyuzDorNII, Transport, 1978.- P.35-36.

Claims (1)

A method of producing crushed stone-mastic asphalt mix with the addition of screenings of crushing limestone brand 400, comprising preparing crushed stone and mastic mixture for the device of the upper coating layer, consisting of, wt.%: Crushed stone of hard rocks 72.5-73.5, viscous bitumen or PBB 5 , 5-7.5 (in excess of 100%), and screenings of crushing of limestones of grade 400 in the amount of 26.5-27.5% by weight are introduced into the mineral part of the asphalt-concrete mixture.