53results about How to "Prevent reflective cracks" patented technology

The invention provides a fiber-reinforced rubber asphalt stress absorbing layer and a construction method thereof. The fiber-reinforced rubber asphalt stress absorbing layer per square meter comprises the following components: 0.2-1.0 kg of SBS (styrene butadiene styrene) modified emulsified asphalt, 70-150 g of glass fibers, 1.5-3.0 kg of rubber asphalt and 10-20 kg of broken stones. The construction method comprises the following steps of: spraying an SBS modified emulsified asphalt layer and spreading the glass fibers sequentially on the clean and dry surface of a lower supporting layer; after the SBS modified emulsified asphalt breaks emulsion, spraying the rubber asphalt and spreading the broken stones; and finally, rolling a road surface, and controlling the time from the spraying of the rubber asphalt to the completion of the rolling within 10-20 minutes. The rubber asphalt stress absorbing layer prepared by the invention is firmly adhered to the lower supporting layer, can prevent the oil bleeding phenomenon of an asphalt surface layer and the generation of the reflection crack of the asphalt surface layer, improves the anti-cracking performance of the rubber asphalt stress absorbing layer, and prolongs the service life of the road surface.

The invention discloses a construction method for reconstruction of an old cement pavement into an asphalt concrete pavement, the steps are as follows: 1, pouring seams of the to-be-reconstructed old cement pavement, 2, judging the damage degree of the to-be-reconstructed old cement pavement, and processing damages; 3, spraying hot rubber asphalt on the damage-processed pavement, spreading an aggregate on the hot rubber asphalt, and rolling to embed the spread aggregate into an asphalt film to form a stress absorption and seepage prevention rubber asphalt stress absorbing layer; 4, paving a grating net sheet on the rubber asphalt stress absorbing layer, and fixing; and, paving an asphalt concrete surface layer on the grating net sheet, wherein the asphalt concrete surface layer is paved in two times. The maintenance cost is greatly reduced, the highway overhaul time is greatly extended, the pavement service life is prolonged more than 1 time, and good economic and social benefits are received. In the rubber asphalt production process, tire waste is used, energy is saved, and the construction method is conducive to environmental protection.

The invention discloses a pavement splicing method and structure for old cement concrete pavement reconstruction and expansion. A cement concrete slab splicing seam is formed in a hard shoulder of an old cement concrete slab, steps are arranged on an old road upper base layer, an old road lower base layer and an old road cushion layer for transition, poor concrete is adopted for a new road upper base layer of an expansion part, and unscreened macadam is adopted for a road bed; a new cement concrete slab and the old cement concrete slab are connected by adopting double-layer reinforcing steel bars; a high-molecular polymer anti-cracking paste is firstly stuck to the cement concrete slab splicing seam, then an asphalt concrete anti-cracking leveling interlayer is paved, and a lower asphalt concrete surface layer and an upper asphalt concrete surface layer are finally paved sequentially, wherein the lower asphalt concrete surface layer is doped with 0.3% by mass of short-cut basalt fiber. According to the method and structure, the problem that the durability of existing old cement concrete pavement reconstruction and expansion engineering is insufficient can be effectively solved, and the important significant is achieved for promoting quicker and better development of transportation industry in China.

The invention discloses a geocell reinforced cement concrete pavement structure and a surface layer plate thickness calculation method. The pavement structure mainly comprises a base layer, a surfacelayer and a wearing layer which are sequentially laid from bottom to top. The base layer is composed of an upper geotextile layer, a lower geotextile layer and a middle geocell reinforced graded broken stone layer; the surface layer is a cement concrete layer reinforced by a geocell; the wearing layer comprises a cement mixture wearing layer and a geogrid; pull rings are reserved on the two sidesof each geocell in a road direction, the geocells are stretched to be in a tensioned state, and wooden wedges penetrate through the pull rings to fix the geocell at the outermost end. The surface layer plate thickness calculation method mainly comprises the steps of traffic analysis, initial simulation of a pavement structure, determination of pavement material parameters, and checking of load stress, temperature stress and a structure limit state. The problems that an existing pavement structure is low in strength, and a cement concrete pavement is subjected to fatigue fracture, mud pumping,slab staggering and the like under heavy-load traffic are solved, so that the pavement structure has high bearing capacity and deformation resistance, and damage to the pavement structure is reduced.

The invention discloses a cement-stabilized anti-crack base layer newly-built pavement structure and a construction method and application thereof. The pavement structure sequentially comprises an asphalt concrete upper surface layer, an asphalt concrete lower surface layer, a cement-stabilized anti-crack base layer and a cement-stabilized subbase layer from top to bottom, wherein the cement-stabilized anti-crack base layer is made of an anti-crack cement-stabilized macadam mixture and mainly comprises cement, large-particle macadam and small-size aggregate, the cement-stabilized anti-crack base layer adopts a road mixing construction mode after on-site layer paving, it is guaranteed that the large-particle macadam makes full contact to form main frameworks, and the small-size aggregate evenly fills gaps between the frameworks. According to the cement-stabilized anti-crack base layer newly-built pavement structure, reflection cracks of a semi-rigid base asphalt pavement structure are reduced, so that various disease problems caused by expansion and penetration of the reflection cracks of a traditional semi-rigid base asphalt pavement structure are solved, various diseases caused byexpansion and penetration of the reflection cracks of the pavement structure are reduced, and the purpose of prolonging the service life of the pavement structure is achieved.

The invention discloses high-adhesion modified asphalt and a preparation method thereof, and belongs to the technical field of road engineering materials. The raw materials of the high-adhesion modified asphalt comprises 500 parts of base asphalt, 300-400 parts of an additive and 10-20 parts of composite reinforcing fibers, and the composite reinforcing fibers are prepared by compounding basalt fibers and polyester fibers and then being coated with base asphalt thin films. When preparing the high-adhesion modified asphalt, the composite reinforcing fibers are added, so that the adhesion, high-temperature stability, fatigue durability of asphalt pavements are greatly improved, and the asphalt has the properties of low-temperature crack prevention and reflection crack prevention. The tensile, shear, compressive and impact strength are effectively improved, and the thermal stability and low temperature resistance of the asphalt are improved.

The invention discloses a highway pavement rubblization treatment and reuse laying construction structure and technology and belongs to the field of road construction. The construction structure comprises an original roadbed and a pavement cushion layer. The pavement cushion layer is formed after panel rubblization treatment and roller compaction of an original damaged pavement, and the upper portion of the pavement cushion layer is spread to form a concrete surface layer. The construction technology includes the work steps of early-stage preparation, test site setup, MHB smashing, raw material clearing, compacting and spreading, joining and the like. Investment of raw materials is saved, production cost is reduced, the whole pavement is firm in structure and high in pressure resistance, the whole engineering process is simple, and the construction period is shortened.

The invention discloses a rigidity-reinforced type bridge head structure for operating a highway and governing a bump at a bridge head. The structure includes a bridge abutment, a bridge edge girder crossing board, a roadbed, a bridge surface paving structure, a first-level butting board, a second-level butting board, a first-level pavement layer, a second-level pavement layer and a supporting platform; the bridge edge girder crossing board is erected on a bridge abutment supporting base, and a bridge surface paving structure is paved on the bridge edge girder crossing board; the first-level butting board is erected between the bridge abutment and the supporting platform, one end of the first-level butting board is erected on a bridge abutment bracket; a far end of the first-level buttingboard is erected on the supporting platform, and the first-level pavement layer is paved on the first-level butting board; one end of the second-level butting board is erected on the supporting platform, the other end of the second-level butting board is erected on the roadbed, and the second-level pavement layer is paved on the second-level butting board; expansion joints exist between the bridgeedge girder crossing board and the bridge abutment, between the first-level butting board and a bridge abutment back, and between the first-level butting board and the second-level butting board. Theinvention also provides a construction method of the rigidity-reinforced type bridge head structure for operating the highway and governing the bump at the bridge head. The structure is great in reliability and low in maintenance cost.

The invention discloses an asphalt pavement additionally laid with a rib net and belongs to the technical field of road construction. The asphalt pavement additionally laid with the rib net structurally comprises a cement concrete base layer and an asphalt concrete pavement layer. The asphalt pavement is further provided with the rib net, wherein the rib net is flatly laid on the upper side of the asphalt concrete pavement layer and embedded into the upper surface layer of the asphalt concrete pavement layer to make the pavement flat wholly, and net ropes of the rib net and the road form angles of 20-40 degrees. The asphalt pavement is additionally laid with the rib net to form a whole structure, the rib net forms a transverse prestressing force, the transverse pushing-extruding effect of tire pressures on the pavement is reduced, and track damages are greatly reduced. In addition, a load is effectively dispersed, the anti-cracking performance and anti-impact performance of the asphalt pavement are improved, accordingly the durability of the pavement is improved, and the service life of the road is prolonged.

The invention discloses a ribbed waterproof and water-draining coiled material and a construction method thereof. The ribbed waterproof and water-draining coiled material comprises a waterproof layer,a supporting layer and a water-draining layer, wherein the supporting layer is positioned between the waterproof layer and the water-draining layer; and the waterproof layer, the supporting layer andthe water-draining layer are connected integrally. The waterproof layer, the supporting layer and the water-draining layer are simultaneously arranged on the ribbed waterproof and water-draining coiled material, so that the ribbed waterproof and water-draining coiled material simultaneously has functions of improving foundation or roadbed carrying ability, obstructing underground water and solving the problem of water drainage of a foundation or a roadbed, then uneven sedimentation of the pavement of the foundation and roadbed is reduced, reflection cracks between structure layers of the pavement of the foundation and roadbed are prevented, the stability of the integral structure of the foundation and roadbed is improved, and the service lives of a building structure and a road are prolonged.

The invention discloses a polymer SRX asphalt road construction process, which is characterized by comprising the steps of A, performing preparation required before construction; B, performing bottom layer clearing and treatment; C, performing base layer measurement and sample lofting; D, performing piling and wire hanging; E, stirring mixed materials; F, transporting polymer SRX stable macadam mixtures; G, spreading the polymer SRX stable macadam mixtures; H, performing roller compaction on the polymer SRX stable macadam mixtures; I, caring the polymer stable macadam base layer. By using the technical scheme, the road composite structure made of the polymer SRX stable macadam mixtures has the characteristics of high intensity and high toughness; the road cracking condition is avoided; the service life of the road is prolonged; the effect of the full-thick type asphalt pavement can be achieved only by using half of the manufacturing cost of the conventional asphalt concrete of the polymer SRX stable macadam mixtures; the economic benefits are improved.

The invention discloses a high-strength anti-crack asphalt pavement structure and a construction method thereof, which comprises a cushion layer sequentially paved on the roadbed from bottom to top, Asubbase lay, a base layer and a surface lay, wherein that cushion layer is a gravel or gravel layer, the subbase layer is a plug-in geocell reinforce asphalt concrete layer, the base layer is a welding geocell reinforced asphalt concrete layer, the surface layer is an asphalt concrete layer, and the welding geocell and the plug-in geocell are staggered-jointed and laid. The plug-in type geocell comprises a reinforcement band and a special-shaped insert, wherein the reinforcement band is fixed through the special-shaped insert, and the thickness of the subbase layer is equal to the thickness of the plug-in type geocell. The invention can effectively improve the bearing capacity and the deformation resistance of the asphalt concrete pavement, limit the development of the structural damage crack and the deformation of the asphalt pavement, prolong the service life of the asphalt pavement, reduce the cost and facilitate the construction.

The invention discloses a reflection crack repairing structure and a reflection crack repairing process. The reflection crack repairing structure comprises a waterproof adhesive layer, a fiberglass-polyester paving mat anti-crack layer, a first backfill layer and a second backfill layer, wherein the waterproof adhesive layer is arranged on a grooved bottom surface of a reflection crack; the fiberglass-polyester paving mat anti-crack layer is arranged on the upper surface of the waterproof adhesive layer; the first backfill layer is arranged on the upper surface of the fiberglass-polyester paving mat anti-crack layer; and the second backfill layer is arranged on the upper surface of the first backfill layer. By milling materials around the crack and backfilling the fiberglass-polyester paving mat anti-crack layer and backfill, the reflection crack repairing structure disclosed by the invention has favorable integrity, continuity and durability. When the reflection crack repairing structure is applied to a pavement structure, the reflection crack repairing structure has the functions of isolation, seepage prevention, filtration, drainage and the like, can improve the resistance to fatigue cracking of an asphalt surface course, can prevent the reflection crack and deformation resistance, and can improve the use quality of a semi-rigid base asphalt pavement with obviously insufficient old road intensity, large traffic flow, frequent heavy overload vehicles and severe cracking, thereby prolonging the service life of the pavement structure.

The invention provides a composite pavement road with an asphalt layer coated on a sisal hemp fiber cement-based composite material. A pavement structure of the composite pavement road sequentially comprises an epoxy asphalt concrete surface layer, an interface performance enhancing layer, a sisal hemp fiber cement-based composite material bearing layer, a base layer and a sub-base layer from topto bottom. And the base layer is made of graded stabilized macadam with a flexible characteristic. Main components of the sisal hemp fiber cement-based composite material are cement, fly ash, fine sand, a superplasticizer, an adhesive and sisal hemp fibers, and the sisal hemp fiber cement-based composite material is used as a bearing layer, so that early-stage diseases such as pavement cracks, water damage and ruts can be effectively prevented, the pavement durability is greatly improved, and the service life is prolonged. The coated asphalt layer can improve driving comfort. Meanwhile, due tothe fact that the thickness of the asphalt layer is reduced, the manufacturing cost of the road surface can be remarkably reduced, environmental protection is facilitated, and good social benefits and huge economic benefits are reflected.

The invention discloses a pavement multi-hammer rubblization construction method. The pavement multi-hammer rubblization construction method comprises the following steps of (1) preparation before construction is performed; (2) trial pavement section setting is performed; (3) MHB crushing is performed; (4) compaction is performed; (5) bituminous seal is performed, specifically, emulsified bituminous seal is immediately constructed to pavement after the compaction, the solid content of emulsified asphalt is controlled to be 50%-55%, the using amount of the emulsified asphalt is 2.0-3.5kg/m<2>,then aggregate materials are evenly perfused on the surface of the emulsified bituminous seal, wherein the particle diameter of the aggregate materials is 4.75-9.5mm, Los Angeles abrasion loss is lessthan or equal to 28%, water absorption is less than or equal to 2.0% and silt content is less than 3%, and finally a pneumatic-tired roller is used for rolling compaction of the pavement for 2-4 times. The pavement multi-hammer rubblization construction method can realize full collection of parameters of the pavement, performs adjustment and monitoring in time, performs timely adjustment for different pavement conditions, performs various types of pavement rubblization construction, and has a stable crushing effect, good economic benefits and broad market promotion value.

The invention discloses a stress segmentation-type pavement structural layer. Joint-type stress bars are laid longitudinally in a structural layer of asphalt concrete pavement, the joint-type stress bars laid on an upper layer can prevent cracks generated by traffic loads and climate change, laid on a lower layer can prevent reflection cracks of a base layer, and laid on the base layer can preventcracks appearing on the base layer in the hardening process. According to the stress segmentation-type pavement structural layer, the problem of the horizontal cracks of a road is solved, the servicelife of the road is prolonged, later supporting of the road is delayed, the thickness of a pavement surface layer is reduced, and a pavement structure of a strong-base thin surface can be realized.

In an embodiment, the invention discloses an anti-reflection-crack waterproof coiled material used in airport runways. The anti-reflection-crack waterproof coiled material includes, in a successive arrangement from bottom to top: a first stress dissipation layer, being formed from special modified asphalt; a second stress dissipation layer, being formed from a special polyester nonwoven cloth; a third stress dissipation layer, being formed from special modified asphalt; and a rock sheet layer, being formed by rock sheets in 8-10 meshes. A construction method of the anti-reflection-crack waterproof coiled material used in the airport runways is also provided, wherein the construction method comprises: (1) coating a treatment agent on two sides of slab joints of a cement concrete pavement and all cracks to ensure binding fastness between the coiled material and the cement concrete pavement during construct of a thermal melting method; (2) releasing the coiled material and adjusting the position of the coiled material, and then rolling-up the coiled material and performing full-sticking through the thermal melting method; and (3) paving and sticking the coiled material on upper surfaces of the slab joints or the cracks, wherein the slab joints or the cracks are required to be at the center of the coiled material after the coiled material paved, the overlap width of the coiled material is required to be not less than 150mm with the rock sheets at the overlapped portion required to be removed. The anti-reflection-crack waterproof coiled material allows the stress generated during shrinkage of the cement concrete pavement to be uniformly dispersed.

Formulations and methods of making and using two emulsions, one emulsion having a rejuvenating agent and another emulsion having an asphalt phase. The two emulsions may be serially applied or blended together to form a dual emulsion for various deteriorated pavement surface treatments. The two emulsions may be used with a recycled asphalt product, either being mixed with the recycled asphalt product or serially applied to the recycled asphalt product. The two emulsions when blended together may form a dispersion having different phases with different setting times. The surfactant in the rejuvenating emulsion may be faster setting for a preferred initial break and better interaction with the pavement product, while the surfactant in the asphalt emulsion may break more slowly and provide more time to combine with the rejuvenated binder and fully coat the deteriorated asphalt product, and any virgin aggregate added to the mix.

The invention relates to a flexible asphalt concrete pavement construction method. The method comprises the following steps: treating a lower supporting layer, arranging an elevation measuring wire, blending an asphalt mixed material and paving the asphalt mixed material, wherein the paving step comprises paving of a bottom layer, paving of a middle layer, paving of an upper layer and compaction of the asphalt mixed material; light, intermediate and heavy-type road rollers are used for construction according to a sequence of being light, intermediate and heavy; and the compactness is controlled to be larger than 95%. The method disclosed by the invention has the advantages of greatly reducing the use of a stone material in steps, also greatly saving the use of an asphalt raw material, remarkably improving the crack resistance of asphalt concrete, effectively preventing generation of reflection cracks on an asphalt surface layer and prolonging the service life of a pavement.