CN107059529A - Embedding stone structure and construction method between ultra-high performance concrete surface and upper layer - Google Patents

Abstract

The invention discloses a stone-embedded structure between the surface of ultra-high-performance concrete and an upper layer and a construction method thereof. The stone-embedded structure includes an ultra-high-performance concrete base, crushed stones embedded on the surface of the ultra-high-performance concrete base, a bonding layer and The upper layer; the bonding layer is located on the upper part of the surface formed by the ultra-high performance concrete base and crushed stones, the upper layer is located above the bonding layer, one end of the crushed stone is embedded in the ultra-high performance concrete base, and the other end is upward The layer is raised; the upper surface of the ultra-high performance concrete base is formed with a concave-convex surface due to the extrusion of crushed stones. Part of the hard gravel is consolidated in the ultra-high performance concrete, and the other part is consolidated in the upper layer to enhance the interface interlocking force, and build a macroscopic and microscopic multi-scale interlocking structure on the surface of the ultra-high performance concrete, effectively preventing the above The sliding of the layer at the interface of the base layer can greatly improve the anti-slip performance, shear performance and high temperature stability between the ultra-high performance concrete and the upper layer.

Description

Stone-embedded structure and construction method between ultra-high performance concrete surface and upper layer

technical field

The invention relates to the field of concrete pavement construction, in particular to a stone-embedded structure between an ultra-high performance concrete surface and an upper layer and a construction method thereof.

Background technique

Ultra-high-performance concrete is a fiber-reinforced cement-based composite material that has been developed rapidly in recent years. It has been successfully applied to important pavement structures due to its advantages such as high compressive strength, ultra-high toughness, compact surface and good durability. In order to protect the structure from the direct mechanical damage of the vehicle load, the upper layer is laid on the ultra-high performance concrete surface to meet the vehicle driving performance requirements.

Since the ultra-high-performance concrete material does not contain coarse aggregate, the particle size is generally less than 1mm, and the surface is dense and smooth after molding. For this reason, hard-cut groove method and shot blasting method are usually used to increase the interlocking force and anti-skid Move horizontally, the effect is better. But there are also problems with these two methods:

1. Hard groove method

① Surface grooves with a depth of 3 mm to 4 mm, a width of 3 mm to 5 mm, and a spacing of 7 mm to 10 mm will damage the ultra-high performance concrete structure and reduce the thickness of the steel bar cover; It can be compensated by increasing the thickness of ultra-high-performance concrete, but the self-weight of the structure will be significantly increased, and the project cost will be increased.

②In subsequent maintenance projects, when replacing the old surface, the grooves must be re-grooved or the original grooves should be cleaned, which will further damage the ultra-high performance concrete structure and increase the risk of corrosion of structural steel bars.

2. Shot blasting method

① Shot blasting on the surface of ultra-high performance concrete can only produce a rough surface with mesoscopic texture. This is because the ultra-high performance concrete material component does not contain coarse aggregate, so the shot blasting process can only form a mesoscale surface structure .

② In terms of slip resistance and shear resistance, the surface microstructure of ultra-high performance concrete is insufficient.

③Under the shot blasting method, the interlayer shear strength between ultra-high performance concrete and asphalt can meet the engineering requirements at room temperature (20°C); There is a risk of interlaminar shear failure due to insufficient high temperature stability.

Contents of the invention

The technical problem to be solved by the present invention is: aiming at the possible shear failure problem between the surface of ultra-high performance concrete and the upper layer, especially in hot areas, heavy traffic, extra heavy traffic roads, or continuous long and steep vertical slope road sections , bridge deck pavement and other projects that require high anti-slip and shear strength, the invention constructs a macro- and micro-scale multi-scale texture structure on the surface of ultra-high performance concrete, strengthens the synergistic effect of interlocking force and cohesive force, and comprehensively improves In order to improve the shear strength and slip resistance between ultra-high performance concrete and the upper layer, a stone-embedded structure between the ultra-high performance concrete surface and the upper layer and its construction method are designed.

In order to solve the above technical problems, the present invention firstly discloses a stone-embedded structure between the surface of ultra-high performance concrete and the upper layer, including the base of ultra-high performance concrete, the gravel embedded in the surface of the base of ultra-high performance concrete, and the bonding layer and the upper layer; the bonding layer is located on the upper part of the surface formed by the ultra-high performance concrete base and gravel, the upper layer is located above the bonding layer, and one end of the crushed stone is embedded in the In the ultra-high performance concrete base, while the other end protrudes toward the upper layer; the upper surface of the ultra-high performance concrete base forms a concave-convex surface due to the extrusion of the crushed stone; the crushed stone and the concave-convex surface The layout of the ultra-high-performance concrete base and the upper layer forms a macroscopic and microscopic multi-scale interlocking structure.

Further, the surface texture depth TD of the ultra-high performance concrete base is 1.0-2.0mm.

Further, the embedding depth of the gravel in the ultra-high-performance concrete base is 2/5-3/5 of its particle size, and this embedding depth has the best embedding effect with the ultra-high-performance concrete.

Further, the shape of the crushed stone is polyhedron, its material is quartz sand or basalt, and its particle size is 4.75-9.5mm; because ultra-high performance concrete is densely covered with fibers, if the crushed stone is too thick, the surface structure will be seriously disturbed, and the It is difficult to insert; too thin can not play a role in embedding. The surface of the crushed stone is clean and dry or coated with a mortar material consistent with the ultra-high performance concrete. The main component of the mortar material is the same as that of the ultra-high performance concrete. performance concrete bond.

Further, the spreading amount of the crushed stone is 40%-80% of the surface area of the ultra-high performance concrete base.

Further, the average depth of depressions on the concave-convex surface is 3-6 mm.

Further, the upper layer is an asphalt mixture formed by any one or more combinations of asphalt concrete, modified asphalt concrete, asphalt mastic macadam, epoxy asphalt concrete, Superpave or Novachip, and the asphalt mixture The thickness of the material is controlled to be 10 mm to 60 mm; or the upper layer is a thin polymer overlay, and the thickness of the thin polymer overlay is controlled to be 6 mm to 25 mm.

Further, the interlayer oblique shear strength between the ultra-high performance concrete base and the upper layer at room temperature is above 1.5 MPa, and the interlayer oblique shear strength between the ultra high performance concrete base and the upper layer at 60°C is above 1.0 MPa.

Then the present invention discloses a construction method of the stone-embedded structure between the above-mentioned ultra-high performance concrete surface and the upper layer, comprising the following steps:

1) After paving the ultra-high performance concrete base, spread gravel before the initial setting of the ultra-high performance concrete base;

2) Press crushed stones into the ultra-high performance concrete base, and the embedding depth is 2/5-3/5 of the particle size of the crushed stones to form a concave-convex surface;

3) After the ultra-high performance concrete base is steamed and cured at high temperature, it is cooled naturally, and the surface is purged with compressed air to remove the surface laitance and loose gravel;

4) Spray the bonding material on the concave-convex surface to form a bonding layer. The bonding layer is selected from high-viscosity modified asphalt or hot asphalt, and the dosage is 0.8-1.4L/m ² , or modified emulsified asphalt is used, and the dosage is 0.3- 0.6L/ ^m2 ;

5) An upper layer is set on the concave-convex surface of the ultra-high performance concrete base, so that the gravel is completely combined with the upper layer to form a whole, and the upper layer is made of asphalt mixture.

Further, in the step 4), the adhesive layer is made of epoxy resin material, and the dosage is 0.9-1.3kg/m ² , and in the step 5), the upper layer is made of polymer concrete.

Compared with the prior art, the present invention has the advantages of:

Part of the hard crushed stone is consolidated in the ultra-high performance concrete, and the other part is consolidated in the upper layer to enhance the interfacial embedding force, and build a macroscopic and mesoscopic multi-scale texture structure on the surface of the ultra-high performance concrete to strengthen the embedding force At the same time, combined with the bonding effect of the bonding material of the bonding layer, it can effectively prevent the upper layer from slipping at the interface of the base layer, and greatly improve the anti-slip performance and anti-slip performance between the ultra-high performance concrete and the upper layer. Shear performance and high temperature stability.

The present invention will be described in further detail below with reference to the accompanying drawings.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is a schematic diagram of the stone-embedded structure between the ultra-high performance concrete surface and the upper layer disclosed by the preferred embodiment of the present invention;

Fig. 2 is the first partially enlarged schematic diagram of the stone-embedded structure between the ultra-high performance concrete surface and the upper layer disclosed in the preferred embodiment of the present invention;

Fig. 3 is a second partially enlarged schematic diagram of the stone-embedded structure between the ultra-high performance concrete surface and the upper layer disclosed in the preferred embodiment of the present invention.

illustration:

1. Ultra-high performance concrete base; 2. Gravel; 3. Concave-convex surface; 4. Adhesive layer; 5. Upper layer.

detailed description

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

The present invention firstly discloses a stone-embedded structure between the surface of ultra-high performance concrete and the upper layer, as shown in Fig. 1-Fig. Layer 4 is located above the ultra-high performance concrete base layer 1, and the upper layer 5 is located above the bonding layer 4. In this embodiment, a large amount of crushed stones 2 are embedded between the ultra-high performance concrete base layer 1 and the upper layer 5; One end of the gravel 2 is embedded in the ultra-high performance concrete base 1 , while the other end is embedded in the upper layer 5 . The upper surface of the ultra-high performance concrete base 1 is squeezed by the crushed stone 2 to form a concave-convex surface 3; the arrangement of the crushed stone 2 and the concave-convex surface 3 forms an interlocking structure between the ultra-high performance concrete base 1 and the upper layer 5 . Through this structure, the anti-slip performance, shear performance and high temperature stability between the surface of the ultra-high performance concrete base layer 1 and the upper layer 5 are greatly improved.

Wherein, in this embodiment, the crushed stone 2 is polyhedral in shape, and quartz sand is used, and its particle size is 4.75 mm to 9.5 mm. Because ultra-high performance concrete is densely covered with fibers, if the crushed stone is too thick, the surface structure will be seriously disturbed, and It is difficult to press in; too thin to play the role of interlocking. The spreading amount is 60% of the surface area of the ultra-high performance concrete base 1 . At the same time, the surface of the crushed stone 2 is clean and dry during use, and the embedded depth of the crushed stone 2 in the ultra-high performance concrete base 1 is 3/5 of the grain size of the crushed stone. At this time, the embedding effect of the crushed stone and the ultra-high performance concrete optimal. The average depth of the concave-convex surface 3 on the surface of the ultra-high performance concrete base 1 is 4mm, and the surface structure depth TD=1.0-2.0mm. Preferably, the surface structure depth TD=1.8mm, which has a better anti-slip effect at this time. .

In specific construction applications, the upper layer 5 can be one or more combinations of asphalt concrete, modified asphalt concrete, asphalt mastic macadam, epoxy asphalt concrete, Superpave or Novachip, and its thickness is 10mm to 60mm. In this embodiment, the upper layer 5 adopts 35mm asphalt mastic gravel (Stone Mastic Asphalt). Optionally, the paving material of the upper layer 5 is a thin-layer polymer concrete overlay with a thickness of 6mm-25mm.

Then, the present invention discloses a construction method for the stone-embedded structure between the above-mentioned ultra-high performance concrete surface and the upper layer, comprising the following steps:

1) After paving the ultra-high performance concrete base 1, spread gravel 2 before the ultra-high performance concrete base 1 is initially set;

2) Press crushed stones 2 into the ultra-high performance concrete base 1 to an embedding depth of 2/5 to 3/5 of the particle size of the crushed stones to form a concave-convex surface 3;

3) After the ultra-high-performance concrete base 1 is steamed and cured at high temperature, it is cooled naturally, and the surface is purged with compressed air to remove the surface laitance and loose gravel;

4) Spray the bonding material on the concave-convex surface 3 to form the bonding layer 4. The bonding layer 4 is made of high-viscosity modified asphalt or hot asphalt with an amount of 0.8-1.4L/m ² , or modified emulsified asphalt with an amount of 0.3- 0.6L/ ^m2 ;

5) An upper layer 5 is set on the concave-convex surface 3 on the ultra-high performance concrete base 1, so that the gravel 2 is completely combined with the upper layer 5 to form a whole, and the upper layer 5 adopts asphalt mixture.

Optionally, in the actual construction process, in step 4) of the above construction method, the adhesive layer 4 is made of epoxy resin material, and the dosage is 0.9-1.3kg/m ² , and in step 5), the upper layer 5 is made of polymeric Material concrete can also achieve excellent results.

Further, in this embodiment, the surface texture lateral contrast test was carried out on the formed ultra-high performance concrete smooth surface, shot blasting and stone embedding, and the results are shown in Table 1 (wherein the smooth surface is the surface of ultra-high performance concrete without treatment ):

Table 1 Depth of ultra-high performance concrete surface texture structure

surface type glossy Grooved shot blasting Embedded stone TD/mm 0.51 0.66 0.52～0.60 1.0～2.0

It can be seen from Table 1 that after shot blasting on the surface of ultra-high performance concrete, the surface texture depth TD is slightly higher than that of the untreated smooth surface, but it is obviously not as good as the effect of stone embedding (that is, embedding gravel 2).

At the same time, the shot blasting method and the stone embedding method were used to conduct a transverse shear strength test. The results of the interlayer oblique shear test between ultra-high performance concrete and asphalt are shown in Table 2 (among them, shot blasting 1 refers to the use of shot blasting machines to test UHPC Surface shot blasting, surface structure depth TD=0.54mm; shot blasting 2 refers to shot blasting of UHPC surface by shot blasting machine, surface structure depth TD=0.58mm; 60% stone embedding refers to the amount of gravel scattered as ultra-high performance concrete base 60% of the surface area of 1, the particle size of crushed stones is 4.75mm-9.5mm; 80% stone embedding means that the amount of scattered crushed stones is 80% of the surface area of ultra-high performance concrete base 1, and the particle size of crushed stones is 4.75mm-9.5mm. ):

Table 2 Results of oblique shear test between layers of ultra-high performance concrete and asphalt

It can be seen from Table 2 that under the shot blasting method, the interlayer shear strength between ultra-high performance concrete and asphalt can reach 0.71-0.80 MPa at room temperature (20°C), which meets the engineering requirements. The interlayer shear strength is 0.41-0.45MPa, so there is a risk of interlayer shear failure due to insufficient high temperature stability; Minimal, with obvious advantages.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. the embedding stone structure between a kind of ultra-high performance concrete surface and upper layer, including ultra-high performance concrete basic unit (1), Rubble (2), tack coat (4) and the upper layer (5) of ultra-high performance concrete basic unit (1) surface build-in；Tack coat (4) is located at described Ultra-high performance concrete basic unit (1) and the top on the surface of rubble (2) formation, the upper layer (5) are located at the tack coat (4) Above, it is characterised in that one end of the rubble (2) is mounted in the ultra-high performance concrete basic unit (1), and the other end It is then raised to the upper layer (5)；The upper surface of the ultra-high performance concrete basic unit (1) is because of the extruding by the rubble (2) And form convex-concave surface (3)；The laying of the rubble (2) and convex-concave surface (3) make the ultra-high performance concrete basic unit (1) with Macroscopic view is formed between upper layer (5) and carefully sees multiple dimensioned interlocking structure.

2. the embedding stone structure between ultra-high performance concrete surface according to claim 1 and upper layer, it is characterised in that Surface texture depth TD=1.0~2.0mm of the ultra-high performance concrete basic unit (1).

3. the embedding stone structure between ultra-high performance concrete surface and upper layer according to any one of claim 1-2, Characterized in that, insert depth of the rubble (2) in ultra-high performance concrete basic unit (1) is the 2/5~3/5 of its particle diameter.

4. the embedding stone structure between ultra-high performance concrete surface and upper layer according to any one of claim 1-2, Characterized in that, the rubble (2) is shaped as polyhedron, its material is quartz sand or basalt, its particle diameter is 4.75~ 9.5mm；The mortar consistent with ultra-high performance concrete is dried or wrapped to rubble (2) clean surface.

5. the embedding stone structure between ultra-high performance concrete surface and upper layer according to any one of claim 1-2, Characterized in that, the spreading quantity of the rubble (2) for ultra-high performance concrete basic unit (1) surface area 40%~ 80%.

6. the embedding stone structure between ultra-high performance concrete surface and upper layer according to any one of claim 1-2, Characterized in that, convex-concave surface (3) average depression depth is 3~6mm.

7. the embedding stone structure between ultra-high performance concrete surface and upper layer according to any one of claim 1-2, Characterized in that, the upper layer (5) is bituminous concrete, modified asphalt concrete, asphalt-mastic-broken stone, bituminous epoxy are mixed The asphalt of any or multiple combinations formation of solidifying soil, Superpave or Novachip, the asphalt Thickness control be 10mm~60mm；Or the upper layer (5) is layer polymerization thing cover, the layer polymerization thing cover Thickness control is 6mm~25mm.

8. the embedding stone structure between ultra-high performance concrete surface and upper layer according to any one of claim 1-2, Characterized in that, under the normal temperature of the ultra-high performance concrete basic unit (1) and upper layer (5) interlayer tiltedly cut intensity 1.5MPa with On, the ultra-high performance concrete basic unit (1) and 60 DEG C of interlayers of upper layer (5) tiltedly cut intensity in more than 1.0MPa.

9. a kind of embedding stone structure as any one of claim 1-8 between ultra-high performance concrete surface and upper layer Construction method, it is characterised in that comprise the following steps：

1) after making ultra-high performance concrete basic unit (1), rubble is dispensed before ultra-high performance concrete basic unit (1) not initial set (2)；

2) rubble (2) is pressed into ultra-high performance concrete basic unit (1), insert depth is the 2/5~3/5 of rubble (2) particle diameter, shape Into convex-concave surface (3)；

3) after ultra-high performance concrete basic unit (1) high-temperature steam curing, natural cooling carries out surface purging using compressed air, removed Surface laitance and the rubble of loosening (2)；

4) binding material formation tack coat (4) is sprayed on convex-concave surface (3), the tack coat (4) is modified drip from high viscosity Blue or green or heated bitumen, 0.8~1.4L/m of its consumption², or select modified emulsifying asphalt, 0.3~0.6L/m of consumption²；

5) on the convex-concave surface (3) in ultra-high performance concrete basic unit (1) set upper layer (5), make rubble (2) completely with it is upper Surface layer (5) combines to form entirety, and the upper layer (5) uses asphalt.

10. construction method according to claim 9, it is characterised in that the step 4) in, tack coat (4) uses epoxy Resinous material, consumption is 0.9~1.3kg/m², the step 5) in, upper layer (5) uses polymer concrete.