Pavement. RU patent 2504612.

IPC classes for russian patent Pavement. RU patent 2504612. (RU 2504612):

E01C7/18 - of road-metal and bituminous binders

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Method for reinforcement of road pavement / 2301292
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Method for motor road and aerodrome base construction / 2317364
Method involves in-situ preparing crushed-stone based mix; laying the mix on ground or drain layer in one or several layers; moistening the mix; impregnating thereof with emulsified asphalt and compacting the base. The crushed-stone based mix includes blast-furnace slag in amount of 30% by weight and steel slag in amount of 70% by weight or only blast-furnace slag. Before base compaction bitumen-mineral emulsion including liquid phase, namely potassium carbonates or sodium carbonates in amount of 1-10 l/m2 is added in slag-and-crushed-stone mix. The emulsion is poured over the mix and mixed thereto along with following mechanoactivation of obtained composition with medium-heavy and heavy road-rollers. Base is compacted with ramming road-roller.

FIELD: construction.

SUBSTANCE: pavement includes a base consisting of drain layer, crushed stone layer of soft limestone and gravel, and coarse-grained bituminous concrete layer on which bituminous concrete blanket with surface treatment layer of interlocking black crushed stone with grain size up to 10 mm is placed. Bituminous concrete blanket is comprised by mineral bitumen composition of 50 mm thickness and the following component ratio, wt %: petroleum asphalt - 10.0-11.0; clayite gravel of 20-5 mm grain size - 12.0-14.0; crushed clayite sand with 5-0.16 mm grain size - 64.5-66.5; limestone powder of grain size under 0.16 mm - the rest.

EFFECT: enhanced frost and shear resistance, reduced density, heat conductivity and bitumen consumption of pavement.

2 tbl, 1 dwg

The invention relates to the construction field and may be taken during the construction of pavements, roads, Parking lots, airports, bridges, sidewalks.

Known for the design of road service, consisting of the draining sand layer with a thickness of 30 cm layer of gravel thickness 12 cm, a layer of crushed stone, processed binders, 8 cm thick layer of coarse-grained porous asphalt concrete in the thickness of 6 cm, the coating of fine-grained dense asphalt concrete in the thickness 5 cm (Typical construction structures, products, components. Series 3.503-71. Road service of automobile roads of General use. Design materials. - M: PIP «», 1988. - P.53).

Design has the following disadvantages: high thermal conductivity, density and weight and the considerable thickness of the coating layer.

The closest analogue of a technical nature of the present invention is that the construction of the pavement, consisting of the base, including a drainage layer, crushed limestone, gravel and coarse-grained asphalt concrete, floor coverings, consisting of composition 60 mm thick layer and surface treatment of black crushed stone- sizes up to 10 mm (RF Patent 2332535, IPC 01 7/18. Publ. 27.08.2008 bul. №24).

Part of the shortcomings of the previous analogue inherent prototype. In addition prototype has a low frost resistance, elevated and thickness of the coating layer.

Technical invention to increase frost resistance, , lowering the density, thermal conductivity and pavement.

This technical result is achieved by the road clothes, including base - a drainage layer, a layer of crushed stone of limestone, gravel and a layer of coarse-grained asphalt concrete, hosts of asphalt coating positioned on it a layer of the surface treatment of black crushed stone- sizes up to 10 mm, according to the invention as asphalt concrete mixture, coating used composition thickness of 50 mm, comprising, mass%: road bitumen - 10,0-11,0; expanded clay gravel fractions 20-5 mm - 12,0-14,0; crushed expanded clay sand fraction 5-0,16 mm - 64,5-66,5; mineral powder fraction less than 0.16 mm - the rest. Figure 1 depicts the layers of road clothes.

Road outfit consists of the base layers I and coverage II. The base includes a drainage layer 1, crushed limestone or gravel 2 and coarse-grained asphalt 3. Coating consists of song 4 and layer surface treatment of black crushed stone- 5 sizes up to 10 mm

What is new is that as a coating material acts mixture of the above composition, which reduces the thickness of the coating by high strength characteristics, heat resistance, frost resistance, crack resistance, , high damping capacity, as well as reduce heat stress, thermal conductivity and weight of the proposed material.

Known road mixtures containing heavy expanded clay gravel with bulk density of 800-1200 kg/m 3 , natural sand, limestone, mineral powder and oil road bitumen (TC 218 of the RSFSR-564-86 Mixture road (pilot). - Novosibirsk, , 1986. - P.14-15).

These mixtures have low durability, heat resistance, frost resistance, high density and weight.

Example. Were prepared structures songs (table 1). Б composition was cooked as follows: filler, filler and bitumen were heated to a temperature of 160 + or-2 0 With mixed and compacted under pressure at a pressure of 40 MPa for 3 minutes in cylindrical metal forms (sample sizes-cylinder 71,4 x 71.4 mm). Determination of physical-mechanical properties and were performed according to GOST 9128-97. Frost resistance was determined according to GOST 10060.0-95-10060.5-95. Evaluation of thermal conductivity produced on the meter conductivity of it-1.

Test results compositions are represented in table 2.

As can be seen from table 1 and table 2, the consumption of bitumen in composition adopted in the range of 10.0-11.0 in wt.%. At a flow rate of bitumen less than 10.0% for example 9,5 wt.% (structure 1), reduced strength properties and frost resistance, increased water absorption W (table 2). When the content of bitumen in the mix (11,0% for example, 11,5% Mas. (the 5th), reduced strength indicators, steadiness.

Consumption of expanded-clay gravel adopted within 12-14 wt.%. With the increasing content of clay gravel, for example 16 wt.% (composition 9), reduced frost resistance coefficient and indicators . Reduction of content of clay gravel in the mix, for example 10% of the mass (the 6), reduces the heat resistance and frost resistance, increased water absorption.

From the comparison of the quality of the compositions, compositions on 2-4, 7, 8) with the prototype (10) (table 2) revealed the following advantages before him: comparable with the values of frost resistance coefficients K MDE number of freeze-thaw cycles selection of songs on 25 above prototype, slightly lower water absorption (W), in the average by 0.8% lower density (p), 22.5-27,5% lower thermal conductivity (coefficient of thermal conductivity l), durability and heat resistance meet the requirements of GOST. In addition, due to a considerable reduction of thermal conductivity and high rates thickness of the coating layer of the proposed composition lowered by 10 mm compared with the prototype.

Device of road service is carried out as follows: on the top, hard-Packed tightly drains the layer and the layer of limestone or gravel is placed a layer of coarse-grained asphalt concrete. Б composition with a temperature of 150-160°With fits in accordance with a layer of coarse-grained asphalt concrete, leveled and compacted light (compacting), then middle rink with smooth rolls. Coverage of compositions arranged surface treatment of black crushed stone- sizes up to 10 mm

Table 1

Components

Content, wt.%

Prototype

The proposed composition

1 2 3 4 5 6 7 8 9 10

Bitumen of mark BND 60/90

9,5 10,0 10,5 11,0 11,5 10,5 10,5 10,5 10,5

12,0-13,0

Expanded clay gravel fractions to 20.0 5.0 mm

13 13 13 13 13 10 12 14 16 -

Crushed expanded clay sand fraction of 5.0-0.16 mm

65,5 65,5 65,5 65,5 65,5 68,5 66,5 64,5 62,5 -

Expanded clay sand fraction of 5.0-0.14 mm

66,0-70,0

Limestone mineral powder fraction less than 0.16 mm

rest

dust particles less than 0.14 mm

- rest Table 2

Indicator

Physical and mechanical properties of compositions

The results of the tests proposed songs

Prototype

1 2 3 4 5 6 7 8 9 10

The number of freeze-thaw cycles

150 175 175 175 175 150 175 175 175 150

Coefficient frost resistance, k MDE

0,98 0,99 1,02 1,03 1,05 1,04 1,02 0,99 0,96

1,00-1,02

Compression strength at 20 C, R 20 , MPa

5,2 6,4 6,5 6,0 5,5 6,2 6,3 6,5 6,6 7,8-9,0

Compression strength at 50 C, R 50 , MPa

2,1 3,1 2,9 2,6 2,2 2,1 2,4 3,0 3,2

a 5.3-6,2

Water Absorption, W, %

7,2 3,8 3,0 2,3 2,2 4,6 4,0 2,9 2,7 4,5-2,30

Density, ρ, g/cm 3

1,49 1,51 1,53 1,54 1,55 1,56 1,54 1,52 1,49

1,52-1,55

Thermal conductivity coefficient, l, W/m thermal With

0,072 0,074 0,074 0,075 0,078 0,078 0,076 0,071 0,067 0,098

Coefficient of internal friction, tg φ

0,97 0,96 0,96 0,95 0,93 0,98 0,98 0,94 0,91 -

Indicator clutch, With p , MPa

0,39 0,41 0,43 0,42 0,40 0,46 0,44 0,41 0,40 -

Road pavement, including base - a drainage layer, a layer of crushed stone of limestone, gravel and a layer of coarse-grained asphalt concrete, hosts of asphalt coating positioned on it a layer of the surface treatment of black crushed stone- sizes up to 10 mm, is characterized by the fact that as of asphalt concrete coverings use composition thickness of 50 mm at the following component ratio, mass.%:

road oil bitumen

10,0-11,0

expanded clay gravel fractions

20-5 mm to 12.0-14.0 in

crushed expanded clay sand

5-0,16 mm - 64,5-66,5

limestone mineral powder fraction less than 0.16 mm

rest