Stone base heavy traffic road pavement structure and construction method thereof

Abstract

The invention discloses a stone base heavy traffic road pavement structure and a construction method thereof, and belongs to the field of road engineering. The heavy-load traffic road pavement structure with the stone base layer comprises the stone base layer, an anti-crack transition layer and a pavement pavement layer which are arranged on a roadbed from bottom to top, and the stone base layer is composed of a base layer main body structure and lateral sealing bodies arranged on the two sides of a base layer main body, wherein the base layer main body structure is formed by stone with the particle size of 10-50 cm and a pouring type cementing material; the anti-crack transition layer is formed by sequentially spreading a main layer material, cementing dry powder, asphalt and an embedded material and performing layered compaction, the main layer material adopts hard gravel with the particle size of 3-5cm, and the embedded material adopts hard gravel with the particle size of 0.5-2cm. Compared with the prior art, the road paving structure can effectively improve the bearing capacity, the service life and the service performance of the road structure.

Description

Technical Field

[0001] The invention relates to the field of road engineering, and specifically provides a stone-based heavy-load traffic road paving structure and a construction method thereof. Background Art

[0002] In recent years, with the rapid development of the transportation industry, the demand for heavy and large-scale transportation has also grown rapidly. Heavy-load transportation has a great impact on traditional road structures, often accelerating the destruction of road structures, shortening their service life, and significantly increasing maintenance and repair costs. Especially in typical sections such as highway toll station passages, port access roads, mining roads, and level crossings, due to the combined influence of large vehicle loads and repeated start-stop impacts, the local pavement structure is damaged at an accelerated rate, seriously shortening the service life of the pavement and reducing its service function. Therefore, proposing a road structure suitable for heavy-load transportation service functions has become a difficulty and hot spot in the industry.

[0003] Traditionally, in order to cope with the vehicle load generated by heavy traffic, methods such as increasing the thickness of the pavement structure layer or base layer and improving the material strength are often used to improve the overall bearing capacity of the road structure. However, the above methods will lead to a series of problems such as a significant increase in construction costs, excessive consumption of material resources, and increased maintenance and repair costs. Summary of the invention

[0004] The present invention aims at solving the above-mentioned deficiencies of the prior art and provides a stone-based heavy-load traffic road paving structure with good service performance, high durability and toughness and low engineering cost.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a stone-based heavy-load traffic road pavement structure, comprising a stone-based layer, a crack-resistant transition layer and a road pavement layer arranged on the roadbed from bottom to top:

[0006] The stone base consists of a base body and lateral sealing bodies arranged on both sides of the base body. The base body is formed by filling and combining large-size hard stone and castable binder. The large-size hard stone has a particle size range of 10 cm to 50 cm. The castable binder is a fluid mixture of binder powder and water that is stirred evenly. The mass ratio of the binder powder to the water is 100:(50-120). The lateral sealing bodies are mixed with slag and binder powder. The mass ratio of the slag and binder powder is (85-90):(10-15).

[0007] The anti-cracking transition layer is formed by sequentially spreading and layer-by-layer compaction of main layer material, cementing dry powder, asphalt and embedding material. The main layer material is hard crushed stone with a particle size of 2 cm to 5 cm, and the embedding material is hard crushed stone with a particle size of 0.5 cm to 2 cm.

[0008] The cementitious dry powder is composed of a main material and an activator, and the mass ratio of the main material to the activator is (70-90):(10-30). The main material is stone powder, tailings powder, fine-grained soil, red mud, titanium gypsum, cement, steel slag powder and / or volcanic ash powder, and the activator is magnesium aluminum silicate, sodium α-olefin sulfonate, sodium hexametaphosphate and / or sepiolite powder.

[0009] Preferably, the roadbed of the present invention is constructed with soil or stone materials, the rebound modulus of the top surface of the roadbed is greater than 40 MPa, and the representative value of the deflection value is no more than 210 (0.01 mm).

[0010] Preferably, the representative value of the deflection of the top surface of the stone base layer is not greater than 60 (0.01 mm).

[0011] Preferably, the thickness of the main body of the stone base layer is 60 cm to 120 cm.

[0012] Preferably, the large-size hard stone has a particle size range of 10 cm to 30 cm, and a porosity of 10% to 30% after compaction, particularly preferably 20% to 30%.

[0013] Preferably, the mass ratio of binder dry powder to water in the castable binder is 100:(60-100), and the fluidity is not less than 240 mm.

[0014] Preferably, the width of the lateral seal is 1m to 2m, and the compaction degree is not less than 94%.

[0015] Preferably, the mass ratio of the particle sizes of 40-60mm: 20-40mm: 10-20mm: 5-10mm of the lateral sealing slag material is (10-15%): (25-35%): (10-20%): (30-55%).

[0016] Preferably, the thickness of the anti-cracking transition layer is 4 cm to 6 cm.

[0017] Preferably, when the thickness of the anti-cracking transition layer is 6 cm, the main layer material is 3cm-5cm crushed stone; when the thickness is 5 cm, the main layer material is 3cm-4cm crushed stone; when the thickness is 4 cm, the main layer material is 2cm-3cm crushed stone.

[0018] As a preferred method, the spreading amount of the main layer material in the anti-cracking transition layer is 70kg / m 2 ~110kg / m 2 , particularly preferably 70kg / m 2 ~90kg / m 2 The content of needle-like particles in the hard gravel of the main layer material is not more than 15%, and the crushing value is not more than 24%.

[0019] As a preferred method, the spreading amount of cement powder in the anti-cracking transition layer is 0.8 kg / m 2 ~2.0kg / m 2 , particularly preferably 1kg / m 2 ~1.8kg / m 2 .

[0020] As a preferred method, the asphalt spreading amount in the anti-cracking transition layer is 1.8 kg / m 2 ~3.0kg / m 2 , particularly preferably 2.5 kg / m 2 ~3.0kg / m 2 , using emulsified asphalt or base asphalt. Emulsified asphalt uses slow-cracking anionic or cationic emulsified asphalt with an asphalt content of not less than 50%, and an Engla viscosity of 2 to 10; the base asphalt uses B-grade or above road petroleum asphalt with a needle penetration of 60 to 80 (0.1mm) and a softening point of not less than 46°C.

[0021] As a preferred method, the spreading amount of the embedding material in the anti-cracking transition layer is 20kg / m 2 ~30kg / m 2 The filling material is hard gravel, and the content of needle-like particles is not more than 18%.

[0022] Preferably, the mass ratio of the main ingredient to the activator in the cementitious dry powder is (75-85):(15-25).

[0023] Preferably, the mass ratio of magnesium aluminum silicate, sodium α-olefin sulfonate, sodium hexametaphosphate and sepiolite powder in the cementitious dry powder is (50-65):(10-22):(6-19):(3-12), and particularly preferably (55-60):(15-19):(13-18):(8-12). Among them, magnesium aluminum silicate has a crystal structure of alternately stacked Si-O tetrahedrons and Mg-O hexahedrons, which can be quickly dispersed in an aqueous medium to form a three-dimensional network, adsorbed on the surface of filler material particles and cross-linked to form a stable colloid. At the same time, magnesium aluminum silicate can pass through Mg 2+ 、Al 3+ The ion exchange effect and the alkaline catalytic effect of the water dispersion system stimulate the Si in the filling material. 4+ , Ca 2+ The depolymerization, polycondensation and hydration reactions form a three-dimensional polymer product. The sulfonic acid group in sodium α-olefin sulfonate is hydrophilic, which can effectively reduce the surface tension of the solution and accelerate the dissolution of the filling particles with the aqueous solution. The allyl functional group in sodium α-olefin sulfonate is electrophilic and has a strong affinity for Ca 2+ 、Si 4+ Plasma has a significant dispersing effect, which can promote the full dispersion and suspension stability of the filling particles, making the binder have good homogeneity. Sodium hexametaphosphate contains a large number of oxygen bonds and phosphorus oxygen bonds, which can react with Ca2+ 、Al 3+ When high-valent cations come into contact with the anions, they replace the sodium atoms in the anions and aggregate to form a stable complex through chelation. 2+ 、Al 3+ The concentration of high-valent cations can reduce the micropores formed by free water and improve the anti-penetration and anti-softening properties of the colloidal structure on a macro scale. 2+ 、Si 4+ Plasma can form colloids with filler particles through ion exchange. At the same time, sepiolite powder has a microscopic layer chain and pore structure, which can improve the adsorption effect and water holding performance between hydration products in the medium, and cross-link to form a growing granular structure.

[0024] Preferably, a closed connecting layer may be provided between the anti-cracking transition layer and the road pavement layer.

[0025] As a preferred method, the closed bonding layer is formed by synchronously spreading asphalt and crushed stone and stabilizing the pressure, and the asphalt spreading amount is 1.2kg / m 2 ~1.8kg / m 2 , particularly preferably 1.2 kg / m 2 ~1.6kg / m 2 ; The amount of crushed stone spread is 6kg / m 2 ~9kg / m 2 , particularly preferably 6kg / m 2 ~7kg / m 2 Among them, the asphalt adopts modified asphalt with a needle penetration of 40 to 60 (0.1mm) and a softening point of not less than 65°C; the crushed stone adopts hard aggregate with a particle size of 5mm to 10mm.

[0026] Preferably, the road pavement layer is an asphalt mixture road surface or a cement concrete road surface.

[0027] The asphalt mixture pavement consists of an upper layer and a lower layer, with a total thickness of 8cm to 12cm. The thickness of the upper layer is 3cm to 5cm, and the maximum particle size of the mixture is controlled to be 13mm; the thickness of the lower layer is 5cm to 7mm, and the maximum particle size of the mixture is controlled to be 25mm;

[0028] The thickness of cement concrete pavement is 15cm~30cm, the 28d flexural tensile strength of cement concrete is not less than 5.0MPa, and the maximum particle size of crushed stone used in cement concrete is not more than 31.5mm.

[0029] A further technical task of the present invention is to provide a construction method for the above-mentioned stone-based heavy-load traffic road paving structure.

[0030] The construction method of the heavy-load traffic road pavement structure with a stone base comprises the following steps:

[0031] a. Carry out compaction work on the roadbed and test whether it meets the design requirements;

[0032] b. On the compacted roadbed, the main body of the base with large-size hard stone and the lateral sealing body shall be spread and leveled according to the designed thickness. The thickness of a single layer shall not exceed 60cm. If the designed thickness is greater than 60cm, it shall be constructed in two layers;

[0033] c. After leveling, the large-size hard stone and lateral sealing body are compacted synchronously;

[0034] d. After compaction, the large-size hard stone is poured with cementing material: the pouring cementing material is poured from the surface of the large-size hard stone until it is fully filled and the surface slurry appears;

[0035] e. After the stone base is constructed, the curing time should be no less than 48 hours;

[0036] f. After the curing of the stone base, the anti-cracking transition layer shall be constructed according to the designed spreading amount, including:

[0037] The main layer material is spread and compacted;

[0038] Spread the cementing powder evenly and compact it;

[0039] pouring asphalt;

[0040] Spread the filling material and compact it;

[0041] h. Carry out asphalt mixture or cement concrete pavement pavement construction.

[0042] Preferably, the construction method of the above-mentioned stone-based heavy-duty traffic road pavement structure further comprises:

[0043] Step g. After the construction of the anti-crack transition layer is completed, the closed connecting layer is constructed:

[0044] Asphalt and gravel are spread simultaneously using a special spreading vehicle, with asphalt at the bottom and gravel at the top. After spreading, they are rolled until stable.

[0045] Preferably, in step c, a compaction machine of not less than 32 tons is used to simultaneously compact the large-size hard stone and the lateral seal, so that the porosity of the compacted large-size hard stone reaches 10% to 30%, and the compaction degree of the lateral seal is not less than 94%.

[0046] Preferably, the construction method of the anti-cracking transition layer in step f is specifically as follows:

[0047] Spread the main layer material, and then use a 6-8t steel wheel roller to stabilize the pressure 1-2 times;

[0048] Use a powder spreading vehicle to spread the cement dry powder evenly according to the designed spreading amount, and use a 6-8t steel wheel roller to vibrate once;

[0049] Spread asphalt with an asphalt spreader;

[0050] Spread the embedding material and roll it with a 10-12t steel wheel roller for no less than 4 times until it is stable.

[0051] Compared with the prior art, the stone-based heavy-duty traffic road pavement structure and the construction method thereof of the present invention have the following outstanding beneficial effects:

[0052] (1) The present invention prepares the main body of the road structure base by combining large-size stone and binder, which has the characteristics of high bearing capacity, strong deformation resistance, good long-term durability, etc., and is used to replace the traditional cement or fly ash stabilized crushed stone base, effectively solving the problems of fatigue damage, shrinkage cracking, bearing capacity attenuation and the like of the traditional base under heavy traffic load, and improving the bearing capacity, service life and service performance of the road structure;

[0053] (ii) Lateral seals are set on both sides of the main body of the base, and the inner interface of the lateral seal is in contact with the main body of the base, and the outer interface is in contact with the external environment of the pavement structure. When the main body of the base is cast into a cementing material, the moisture in the cementing material will continuously invade the cementing dry powder in the lateral seal under the action of the osmotic potential difference, and react with it to form a condensate structure, so that the two are continuously fused to form a whole. In the process of contact with the surrounding environment, the outer interface of the lateral seal also continuously absorbs moisture brought by the soil, air or precipitation and undergoes a hydration reaction. This slow reaction process will continuously increase the thickness of the cementing "shell", thereby inhibiting the invasion of external moisture into the main body of the base. Therefore, the lateral seal forms a protective layer that blocks moisture exchange through early reaction with water on the inner and outer interfaces, effectively maintaining the stable humidity state inside the main body of the base, thereby further ensuring the durability of the overall bearing performance and anti-deformation ability of the pavement structure.

[0054] (III) An anti-cracking transition layer is set on the upper side of the stone base. The lower corners of the main layer material in the anti-cracking transition layer are embedded in the stone base under compaction, forming a continuous transition and shear friction resistance structure with it, effectively transferring the external load of the pavement layer. The particles of the spreading cementing dry powder are fine and dispersed on the surface and connected pores of the stone base, main layer material, etc. During the water vapor exchange process, it can slowly undergo hydration reaction to form polymerization products, thereby inhibiting the generation of shrinkage or stress cracks. Spreading asphalt and embedding materials will bond the entire anti-cracking transition layer to form a whole, and greatly reduce the stress concentration on the upper surface of the anti-cracking transition layer, further reducing the generation of micro cracks in the pavement layer.

[0055] (iv) The present invention strengthens the effective connection and stress transfer between the pavement layer and the stone base by cooperating with the closed connection layer and the anti-cracking transition layer, thereby avoiding the damage of the pavement layer caused by structural damage caused by fatigue and stress concentration at the weak connection parts between the layers under the conditions of large principal stress and repeated shearing under heavy traffic load;

[0056] (V) Aiming at the stress and disease characteristics of heavy-load traffic roads, the present invention creatively proposes a new structural combination and material function. On the basis of ensuring the overall performance of the road pavement structure, it effectively reduces the thickness of the traditional pavement layer and replaces cement-stabilized gravel materials, extending the service life cycle by more than 50%, and reducing operation and maintenance costs by more than 30%, which has significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The present invention is further described below in conjunction with the accompanying drawings.

[0058] Attached Figure 1 It is a schematic diagram of the paving structure of a heavy-load traffic road with a stone base according to an embodiment.

[0059] In the figure: 1. pavement layer, 2. closed connecting layer, 3. anti-cracking transition layer, 4. stone base layer, 41. base body, 42. lateral sealing body, 5. roadbed. DETAILED DESCRIPTION

[0060] The present invention will be further described below in conjunction with specific embodiments, but this is not intended to limit the present invention.

[0061] Embodiment 1

[0062]

Road pavement structure

[0063] As attached Figure 1 As shown, the stone-based heavy-load traffic road pavement structure of this embodiment is composed of a stone base layer 4, an anti-cracking transition layer 3, a closed connecting layer 2 and a road pavement layer 1 arranged on a roadbed 5 from bottom to top.

[0064] The total thickness of the road pavement layer 1 is 10 cm, the thickness of the upper layer is 4 cm, and the thickness of the lower layer is 6 cm.

[0065] The thickness of the closed connection layer 2 is 1 cm, and the crushed stone material of 5 mm to 10 mm is used.

[0066] The thickness of the anti-crack transition layer 3 is 5 cm, the particle size of the main layer material is in the range of 3 cm to 4 cm, and the particle size of the filling material is in the range of 1 cm to 1.5 cm.

[0067] The stone base 4 is composed of a base body 41 and lateral sealing bodies 42 on both sides of the base body 41. The filling thickness is 80 cm and is constructed in two layers. The stone material used in the base body 41 has a particle size range of 10 cm to 30 cm. The width of the lateral sealing body 42 is 2 m, and the particle size of the slag material used is not greater than 60 mm.

[0068]

Roadbed construction steps

[0069] a. Leveling and compacting of roadbed 5:

[0070] The roadbed filler is silty clay. After compaction, the top surface rebound modulus measured on site is 55MPa, and the representative value of deflection is 185 (0.01mm).

[0071] b. On the compacted roadbed 5, the first layer of stone base 4 is constructed:

[0072] The thickness of a single layer of the stone base 4 is 40 cm. The side sealing bodies 42 are paved within a width of 2 m on both sides, and the base body 41 is paved in the middle with large-size hard stones.

[0073] The particle size of large-size hard stone ranges from 10cm to 30cm, and the uniaxial saturated compressive strength is 86MPa.

[0074] The lateral seal is made of a mixture of slag and cementing powder, and the mass ratio of slag to cementing powder is 88:12. Among them, the mass ratio of the particle sizes of slag materials of 40mm-60mm: 20mm-40mm: 10mm-20mm: 5mm-10mm is 10%: 25%: 15%: 50%.

[0075] After paving, a 32t heavy roller was used to perform static compaction twice and then to perform strong vibration compaction four times. The porosity of the stone after compaction was 21% and the lateral sealing compaction was 95.2% in the on-site test.

[0076] After compaction, the main body 41 of the base is poured with a binder. The prepared binder is poured evenly on the surface of the stone until it is fully filled and a floating slurry appears on the surface. The binder is a fluid mixture of binder dry powder and water that is evenly mixed. The mass ratio of binder dry powder to water is 100:65. A forced mixer is used to fully mix for 90 seconds, and the measured fluidity is 260mm.

[0077] After the binder is poured, sprinkle water and cure for 48 hours.

[0078] c. After the first stone base layer 4 is constructed, the second stone base layer 4 is constructed.

[0079] The construction requirements are the same as step b. The measured deflection representative value of the stone base after curing is 26.9 (0.01 mm).

[0080] d. After the curing of the stone base 4 is completed, the anti-cracking transition layer 3 is constructed:

[0081] d1. Spreading of main layer material

[0082] The main layer material crushed stone particle size is 3cm~4cm, the needle-like particle content is 5%, and the crushing value is 13%. The spreading amount is 85kg / m 2 After spreading, use an 8t steel wheel roller to stabilize the surface twice.

[0083] d2. Spreading of cement powder

[0084] The mixed cement powder is spread by a powder spreader with a spreading amount of 1.0kg / m 2 After spreading, use an 8t steel wheel roller to compact the material once with weak vibration.

[0085] d3. Asphalt spreading

[0086] The asphalt is a 60% slow-cracking anionic emulsified asphalt with an Engela viscosity of 5. It is spread using an asphalt spreader with a spreading rate of 2.8kg / m 2 .

[0087] d4. Spreading of embedded filling material

[0088] The particle size of the embedded material is 1cm to 1.5cm, and the content of needle-shaped particles is 7%. The spreading amount is 24kg / m 2 After spreading, use a 12t steel wheel roller to roll it 4 times until it is stable.

[0089] e. After the construction of the anti-crack transition layer 3 is completed, the closed bonding layer 2 is constructed:

[0090] Asphalt and gravel are spread simultaneously using a special spreading vehicle, with asphalt at the bottom and gravel at the top. After spreading, a rubber-wheeled roller is used to roll until it is stable and does not loosen. The asphalt uses modified asphalt with a needle penetration of 50 (0.1mm) and a softening point of 68°C. The spreading amount is 1.6kg / m 2 ; The crushed stone particle size is 5mm to 10mm, and the spreading amount is 7kg / m 2 .

[0091] f. After the construction of the closed bonding layer 2 is completed, the road pavement layer 1 is constructed:

[0092] The upper layer is made of SMA-13 ​​asphalt mixture with a thickness of 4 cm. It is spread and compacted using general machinery. The measured void ratio is 3%.

[0093] The lower layer is made of AC-20 asphalt mixture with a thickness of 6 cm. It is spread and compacted using general machinery. The actual measured void ratio is 5%.

[0094] In this embodiment, the cementing dry powder is composed of a main material and an activator. The main material is stone powder, and the maximum particle size is less than 1 mm; the activator is prepared by mixing magnesium aluminum silicate, sodium α-olefin sulfonate, sodium hexametaphosphate and sepiolite powder, and the mass ratio of magnesium aluminum silicate, sodium α-olefin sulfonate, sodium hexametaphosphate and sepiolite powder is 60:19:13:8. In the cementing dry powder used for the base body 41, the mass ratio of the main material to the activator is 85:15; in the cementing dry powder used for the lateral seal 42 and the anti-cracking transition layer 3, the mass ratio of the main material to the activator is 75:25.

[0095] Embodiment 2:

[0096] The pavement structure and construction method of this embodiment are basically the same as those of the first embodiment, the only difference being the mixing ratio between the components of the stone base binder:

[0097] The mass ratio of magnesium aluminum silicate, sodium α-olefin sulfonate, sodium hexametaphosphate and sepiolite powder in the cementing dry powder activator is 55:15:18:12. The mass ratio of the main material to the activator in the cementing dry powder used for the base body 41 is 90:10; the mass ratio of the main material to the activator in the cementing dry powder used for the lateral seal 42 and the anti-cracking transition layer 3 is 80:20.

[0098] The second embodiment is implemented simultaneously with the first embodiment, and is constructed and tested in sections.

[0099] Embodiment three:

[0100] The paving structure and construction method of this embodiment are basically the same as those of the first embodiment, the only difference being that the particle size of the stone base material ranges from 20 cm to 30 cm, and the porosity measured on site after paving is 26%.

[0101] The third embodiment is implemented simultaneously with the first embodiment, and is constructed and tested in sections.

[0102] Embodiment 4:

[0103] The pavement structure and construction method of this embodiment are basically the same as those of the first embodiment, the only difference being the thickness and material composition of the anti-crack transition layer:

[0104] The thickness of the anti-crack transition layer is 4cm. The particle size of the main layer material is 2cm to 3cm, and the spreading amount is 75kg / m 2 The mass ratio of main material and activator in cement powder is 80:20, and the spreading amount is 1.8kg / m 2 The particle size of the embedded material is 0.5cm~1cm, and the spreading amount is 22kg / m 2 The amount of emulsified asphalt spread is 2.6kg / m 2 .

[0105] The fourth embodiment is implemented simultaneously with the first embodiment, and is constructed and tested in sections.

[0106] Embodiment five:

[0107] The pavement structure and construction method of this embodiment are basically the same as those of the first embodiment, the only difference being the material composition of the closed connection layer:

[0108] The amount of crushed stone spread in the closed bonding layer is 6kg / m 2 , the modified asphalt spreading amount is 1.2kg / m 2 .

[0109] The fifth embodiment is implemented simultaneously with the first embodiment, and is constructed and tested in sections.

[0110] Embodiment six:

[0111] The pavement structure and construction method of this embodiment are basically the same as those of the first embodiment, the only difference being the type of pavement layer:

[0112] The pavement layer is made of cement concrete with a thickness of 20cm. The 28d flexural strength of cement concrete is 5.5MPa, and the maximum particle size of crushed stone used in cement concrete is 31.5mm.

[0113] The sixth embodiment is implemented simultaneously with the first embodiment, and is constructed and tested in sections.

[0114] [Comparative Example]

[0115] Each comparative example adopts the construction method described in Example 1, changes the settings of each structural layer and measures the relevant performance indicators of the road pavement structure under different conditions.

[0116] Summary table of the configuration of each structural layer in each embodiment and comparative example:

[0117]

[0118] Comparison results of roadbed performance of various embodiments and comparative examples:

[0119]

[0120]

[0121] It can be seen from the comparison results that the stone-based heavy-duty traffic road paving structure and method of the present invention can strengthen the overall bearing capacity and deformation resistance of the structure, effectively resist fatigue and stress concentration damage of weak interlayer connection parts under the influence of large principal stress and repeated shearing under heavy-duty traffic loads, and maintain a good structural service state. It greatly reduces the fatigue damage, shrinkage cracking, bearing capacity attenuation and other diseases of traditional pavement structures under heavy-duty traffic loads, and improves the bearing capacity, service life and service performance of the pavement structure.

Claims

1. A stone-based heavy-duty traffic road paving structure, characterized in that: It includes the stone base layer, anti-cracking transition layer and pavement layer set on the roadbed from bottom to top: The stone base consists of a base body and lateral sealing bodies arranged on both sides of the base body. The main body of the base is formed by the combination of large-size hard stone and castable binder. The size of the large-size hard stone is 10cm to 50cm. The castable binder is a fluid mixture of binder powder and water after being stirred evenly. The mass ratio of binder powder to water is 100:(50-120). The lateral sealing body is made of a mixture of slag material and cementing dry powder, and the mass ratio of slag material to cementing dry powder is (85-90):(10-15); The anti-cracking transition layer is formed by sequentially spreading and layer-by-layer compaction of main layer material, cementing dry powder, asphalt and embedding material. The main layer material is hard crushed stone with a particle size of 2 cm to 5 cm, and the embedding material is hard crushed stone with a particle size of 0.5 cm to 2 cm. The cementitious dry powder is composed of a main material and an activator, and the mass ratio of the main material to the activator is (70-90):(10-30). The main material is stone powder, tailings powder, fine-grained soil, red mud, titanium gypsum, cement, steel slag powder and / or volcanic ash powder, and the activator is magnesium aluminum silicate, sodium α-olefin sulfonate, sodium hexametaphosphate and / or sepiolite powder.

2. The stone-based heavy-duty traffic road paving structure according to claim 1 is characterized in that: The thickness of the main body of the base is 60cm to 120cm, the porosity of the large-size hard stone after compaction is 10% to 30%, and the fluidity of the cast-type binder is not less than 240mm.

3. The stone-based heavy-duty traffic road paving structure according to claim 1 is characterized in that: The width of the lateral seal is 1m to 2m, and the compaction degree is not less than 94%; The mass proportions of the slag materials of various particle sizes of 40-60mm: 20-40mm: 10-20mm: 5-10mm in the lateral sealing body are (10-15%): (25-35%): (10-20%): (30-55%).

4. The stone-based heavy-load traffic road paving structure according to claim 1 is characterized in that: The spreading amount of the main layer material in the anti-cracking transition layer is 70kg / m 2 ~110kg / m 2 The spreading amount of cement powder is 0.8kg / m 2 ~2.0kg / m 2 , asphalt spreading amount is 1.8kg / m 2 ~3.0kg / m 2 , the spreading amount of the filling material is 20kg / m 2 ~30kg / m 2 .

5. The stone-based heavy-duty traffic road paving structure according to claim 1, 2, 3 or 4, characterized in that: The mass ratio of magnesium aluminum silicate, sodium α-olefin sulfonate, sodium hexametaphosphate and sepiolite powder in the cementitious dry powder is (50-65):(10-22):(6-19):(3-12).

6. The stone-based heavy-duty traffic road paving structure according to claim 1 is characterized in that: A closed bonding layer is arranged between the anti-cracking transition layer and the road pavement layer.

7. The stone-based heavy-duty traffic road paving structure according to claim 6 is characterized in that: The closed bonding layer is formed by synchronously spreading asphalt and crushed stone and stabilizing the pressure. The asphalt spreading amount is 1.2kg / m 2 ~1.8kg / m 2 , 5mm~10mm crushed stone spreading amount is 6kg / m 2 ~9kg / m 2 .

8. The stone-based heavy-duty traffic road paving structure according to claim 1 is characterized in that: The road pavement layer is an asphalt mixture road surface or a cement concrete road surface: Asphalt mixture pavement consists of an upper layer and a lower layer. The thickness of the upper layer is 3cm to 5cm, and the maximum particle size of the mixture is controlled to be 13mm; the thickness of the lower layer is 5cm to 7mm, and the maximum particle size of the mixture is controlled to be 25mm. The thickness of cement concrete pavement is 15cm~30cm, the 28d flexural tensile strength of cement concrete is not less than 5.0MPa, and the maximum particle size of crushed stone used in cement concrete is not more than 31.5mm.

9. The construction method of the stone-based heavy-duty traffic road pavement structure according to claim 1, characterized in that: The following steps are involved: a. Carry out compaction work on the roadbed and test whether it meets the design requirements; b. On the compacted roadbed, the main body of the base layer with large-size hard stones and lateral sealing bodies shall be spread and leveled according to the designed thickness, and the thickness of a single layer shall not exceed 60cm; c. After leveling, the large-size hard stone and lateral sealing body are compacted synchronously; d. After compaction, the large-size hard stone is poured with cementing material: the pouring cementing material is poured from the surface of the large-size hard stone until it is fully filled and the surface slurry appears; e. After the stone base is constructed, the curing time should be no less than 48 hours; f. After the curing of the stone base, the anti-cracking transition layer shall be constructed according to the designed spreading amount, including: The main layer material is spread and compacted; Spread the cement powder evenly and compact it; pouring asphalt; Spread the filling material and compact it; h. Carry out asphalt mixture or cement concrete pavement pavement construction.

10. The construction method of the stone-based heavy-duty traffic road pavement structure according to claim 9, characterized in that: After the construction of the anti-cracking transition layer is completed, the closed connecting layer is constructed: Asphalt and gravel are spread simultaneously using a special spreading vehicle, with asphalt at the bottom and gravel at the top. After spreading, they are rolled until stable.

Images