Method of reconditioning of road pavement layers
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Method of reconditioning of road pavement layers / 2271415 Invention relates to road building and repairing and it can be used at repeated use of old asphalt-concrete coating. According to proposed method of reconditioning of layers of road pavement coming to loosening of layers by milling, delivering of binder and water into milled material, mixing of components and distributing and compacting the mixture, layer obtained after compacting is heated to depth of 3-5 cm and loosened to said depth after which mixture is distributed and compacted. |
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Method for reinforcement of road pavement / 2301292 Method involves providing hot regeneration process by heating top layer of existing asphalt-concrete pavement through 3-5 cm depth; mellowing said layer by cutting; introducing into ground heated material novel mixture of porous or high-porous asphalt-concrete in an amount needed for leveling and reinforcing; mixing said components; distributing mixture; applying thereon novel mixture for high-density or dense asphalt-concrete in 2-5 cm thick layer; providing joint compaction of both layers. |
 Method for cracked paved surface repair / 2306380Method involves laying reinforcing mat over crack; fastening reinforcing mat to paved surface from one crack side by applying adhesive on reinforcing mat surface and on paved surface or only on paved surface in crack area; pressing reinforcing mat to paved surface or adhesive correspondingly; leaving unsecured mat as it is from opposite crack side; laying paving material onto reinforcing mat. Reinforcing mat is formed of non-woven web including mineral and polymeric fiber mix. |
 Method for motor road and aerodrome base construction / 2317364Method 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. |
 Road paving construction method / 2318947Method involves laying combined crack-stopping layer on road base, wherein the crack-stopping layer comprises elastic membrane and reinforcing geo-mesh laid thereon; laying load-bearing layer formed of asphalt-concrete mix onto crack-stopping layer. Combined crack-stopping layer is arranged on previously prepared road base. Road base preparation involves dividing road bed into several components, for instance blocks or fragments; compacting the blocks or fragments and placing ground layer thereon. The elastic membrane is leveling asphalt-concrete mix including organic binding agent. Binding agent composition is selected from minimal ambient temperature of road building site. Reinforcing geo-mesh material is selected to provide high extension strength and low deformation ability. Several variants of road paving creation method are also disclosed. |
 Method of cold recovery for pavement clothing layer / 2331728Invention is attributed to road repair works and can be used for asphalt concrete recovery during repairing of pavement clothing for highways, municipal roads, pavements, areas, etc. Method of cold recovery for road clothing layers includes loosening of road clothing layers while adding necessary quantities of broken stone, sand, bonding substance and water and compaction of road clothing. As bonding substance, unhydrated lime carbonate is used. It is distributed onto old layer before recovery of road clothing layer while adding necessary quantities of broken stone and sand depending on grain size of road clothing layer being recovered, and water is added during recovery depending on humidity of road clothing layer being recovered and amount of bonding substance. Amount of substance and water and compaction of road clothing constitutes 2.5-3.0% of recovered road clothing layer mass. |
 Road surfacing / 2332535Invention relates to the field of construction and can be used during the construction of road surfaces for motor roads, aerodromes and pavements. Road surfacing includes the base - the drainage layer, a layer of rubble from weakly-durable limestone, gravel and a layer coarse-grained asphalt concrete, on which is placed a coating from asphalt concrete with a layer of surface processing located on it from black crushed stone-choke stone with sizes up to 10 mm. As the asphalt concrete coating mixture, a bitumen-expanded clay composition with a thickness of 60 mm is used with the ratio of components, mass. %: road oil bitumen - 12.0-13.0, keramsite sand of fraction of 0.14-5.00 mm - 66.0-70.0, expanded clay is the rest. |
 Method for pavement hardening and waterproofing (versions) / 2347031Inventions concern the methods for hardening and waterproofing of the paved surfaces such as road and parking pavements. Application of the asphalt cutback layer onto the surface; application of a hardening mat over the surface, wherein the hardening mat has the first layer containing a nonwoven mat made of a mix of mineral and polymer fibers and the second mineral fiber layer attached to the first layer, and the asphalt cutback penetrates the hardening mat and impregnates it to create a waterproofing barrier, and the hardening mat is porous enough to allow the asphalt cutback to penetrate and impregnate it and absorbs at least about 0.32 l/m2 of asphalt cutback; and application of the pavement material over the hardening mat. Additionally described are versions of pavement hardening and waterproofing methods, and also a method for repairing a pavement with extended crack. |
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Strengthening method of road pavement / 2365698 Invention relates to door-repair work and can be used at strengthening of road pavement of non-rigid type. Strengthening method of road pavement by method of cold regeneration, consisting in milling of existing coating, introduction into grinned material of additives, mixing of components, distribution and compaction of mixture and laying of trailing layer. Milling is implemented with providing of 3-5% dual-slope cross slope of bottom of regenerated layer by means of installation of ends of rotor for different depth of tillage. |
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Road pavement surfacing or repairing method and method of repairing road pavement with grooves / 2369679 Invention refers to road construction industry and can be used during construction and repair of road pavements. Road pavement surfacing or repairing method involves levelling of the pavement till clearance level under a three-metre levelling board is not more than 3-5 mm, and laying thereon of protective and rough wearing coat. As protective and rough wearing coat, there used is dense asphalt mix containing the following, wt %: crushed stone obtained from hard-to-polish rocks with particle size of 3-10 mm or 5-15 mm - 65-70, sand of crushed hard-to-polish rock screening with particle size of up to 5 mm - 10-15, mineral limestone powder - 15-20, bitumen, above 100% of mineral part 5.5-6.5 with layer 15-25 mm thick, at the mixture temperature of 215-225°C, packing with vibratory beam of the asphalt laying machine at the speed of the latter of 1.0-2.0 m/min and pressing into the coating with the compactor. Method of repairing road pavement with grooves is described. |
FIELD: road building.
SUBSTANCE: invention relates to road building and repairing and it can be used at repeated use of old asphalt-concrete coating. According to proposed method of reconditioning of layers of road pavement coming to loosening of layers by milling, delivering of binder and water into milled material, mixing of components and distributing and compacting the mixture, layer obtained after compacting is heated to depth of 3-5 cm and loosened to said depth after which mixture is distributed and compacted.
EFFECT: reduced cost of repair at increase of load-bearing capacity of reconditioned layer.
2 cl, 2 ex
The present invention relates to road repair work and can be used in re-use the old blacktop.
Known methods of hot regeneration of the upper layer of asphalt concrete pavement, lies in its heat at a depth of 3-5 cm, loosening milling, the introduction of preheated crushed material additives, mixing, distribution mixture and seal [1]. Their disadvantage is the possibility of regeneration of only the top layer of the coating at a limited depth.
Known methods of cold regeneration of asphalt pavement layers, which consists in loosening these layers by milling without warming up, the introduction of the crushed material, asphalt granules (AG) - binder and water, mixing the mixture distribution and seal [2]. These methods allow you to turn the cracked package of asphalt layers in a monolithic layer of Foundation.
One of such methods is a method comprising using as the binder of bituminous emulsions [3]. This method is closest to the proposed technical solution and the achieved result.
The disadvantage of ways cold regeneration is the high porosity of the regenerated material layer - asphaltogranulated (AGB),and therefore required the laying of an additional protective layer of dense asphalt concrete or surface treatment device.
The purpose of the proposed invention is areducing material costs while increasing the bearing capacity of the recycled layer.
This goal is achieved by the sequential combination of technological operations, hot and cold methods.
Layers of the road pavement loosened milling, introducing powdered material, if necessary, a binder, water and other additives, mix components, distribute the mixture and condense it, the resulting layer is heated to a depth of 3-5 cm, and optionally compacted.
This goal is achieved because of the layers of the road pavement loosened milling, introducing powdered material, if necessary, a binder, water and other additives, mix components, distribute the mixture and condense it, warm up the resulting layer to a depth of 3-5 cm, loosened it to the same depth, introduce, if necessary, additives, mix components, distribute the mixture and condense it.
When heated, the upper part of the AGB-layer compaction of the mixture increases dramatically, allowing you to get out of it after dopolneniya layer of dense asphalt concrete type that meets the requirements of GOST 9128-97.
If the composition of AGB-mixture requires adjustment, the optimum content of the additives introduced into the heated part of the AGB-mixture, determined according to [4].
The presence AGB-see the sea water eliminates the degradation of bitumen by heating, what is happening when hot asphalt-concrete pavements regeneration.
Example 1. The existing road clothing has a total modulus of elasticity Eabout=200 MPa at the required value of Eabout=225 MPa. The overall modulus of elasticity on the surface of the lower base layer EOBO=86 MPa.
Cracked package of asphalt layers of old pavement has profesionali road cutter to a depth of 17 cm, with the help of stabilizer introduced in AG 1,8% bitumen emulsion, mixed components, distributed the mixture on the roadway and condensed its rollers, having AGB-layer thickness of 20 cm AGB-layer up to a depth of 4 cm with asphaltogranulated kit cars "remixer" and doplatili rollers. The result was regenerated layer consisting in the lower part of 16 cm layer AGB density of 2.14 g/cm2module EAGB=1200 MPa and in the upper part of 4 cm asphalt concrete layer (AB) density of 2.26 g/cm2module EAB=3000 MPa. By calculation according to [5] received the Eabout=225 MPa for the common module of elasticity on the border between AGB-layer and AB-layer Eobj=212 MPa. If limited to only cold regeneration, would have had over 20 cm layer AGB put 3.5 cm layer of dense asphalt concrete to obtain the required modulus of elasticity.
Example 2. The required modulus of elasticity of the existing road odigie about=240 MPa. In this case obtained in the first example, the total value of the modulus of elasticity is restored pavement is not enough.
After completing all operations on a cold regeneration described in the first example, warmed AGB-layer to a depth of 3-5 cm, have loosened it with hot Miller-mixer - remixer, he added, if necessary, hot asphalt mix, brought from PARA, in the amount of 50 kg/m2mixed components, distributed mixture and condensed it. In the received Eabout=246 MPa. If limited to only cold regeneration, would have had over 20 cm layer AGB put 5 cm layer of dense asphalt concrete to obtain the required modulus of elasticity. Savings amounted to 3 cm or 75 kg/m2blacktop.
Sources of information
1. Bakhrakh G.S., gorlina G.S. Problem of regeneration of asphalt pavement//Drive. road. - 1981. - 19. - P.17-20.
2. Bakhrakh G.S. Cold regeneration non-rigid road pavement type. - M., 1999. - 84 S. - (car Kit. road: Obsorn. info./Informatton, issue 6).
3. Swiss Pat. 1661953 in class. E 01 19/10.
4. Manual for the construction of asphalt concrete pavements and bases for roads and airfields (SNiP 3.06.03-85, SNiP 3.06.06-88) / Soundarya. - M., 1991. - 162 C.
5. Design of rigid pavements: ONE 218.046-01/Rosavtodor Mi the trance of the Russian Federation. - M.: Informator, 2001. - 145 S.
Method of regeneration of the layers of the pavement, which consists in their loosening milling, the introduction of the shredded material binder and water, mixing the mixture distribution and the seal, wherein the received after the sealing layer is heated to a depth of 3-5 cm, loosened at the same depth, mix, distribute the mixture and condense it.