Epoxy asphalt pouring concrete paving structure and method thereof

Abstract

The present invention relates to the field of steel bridge deck pavement, and discloses an epoxy asphalt cast concrete pavement structure and a method thereof. The epoxy asphalt cast concrete pavement structure comprises a steel bridge deck that has been sandblasted and derusted, an anti-corrosion layer and a waterproof bonding layer, and also comprises an epoxy asphalt cast concrete pavement layer and wear-resistant aggregate; the epoxy asphalt cast concrete comprises: component A is an epoxy resin main agent, including epoxy resin, an active diluent and a low-viscosity inactive diluent; component B is a curing agent, which adopts a compound of a long-chain aliphatic primary amine, an alicyclic diamine and a polyamide curing agent; component C is petroleum asphalt; and is prepared by mixing component A, component B, component C and stone. The waterproof adhesive adopts a second-order reaction type epoxy resin adhesive, which has high bonding strength, excellent waterproof performance, good toughness, and realizes single-layer pavement instead of double-layer pavement, and the service life of the steel bridge deck pavement layer is long, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of steel bridge deck pavement, in particular to an epoxy asphalt pouring type concrete pavement structure and a method thereof. Background Art

[0002] At present, traditional poured asphalt concrete has poor high-temperature performance and cannot be used as a single-layer pavement. It can only be used as the lower layer of the pavement. The upper layer of the pavement needs to use concrete with good high-temperature performance. Moreover, under high temperature and heavy load, poured asphalt concrete pavement is prone to defects such as rutting. Epoxy asphalt concrete has excellent high-temperature performance and requires rolling for paving. When the pavement thickness exceeds a certain range, it is prone to defects due to inadequate rolling, making it difficult to use as a single-layer pavement. Moreover, the synergistic deformation ability and waterproof effect of epoxy asphalt concrete pavement and steel plates need to be further strengthened.

[0003] Chinese patent document CN1563588A discloses a paving structure for a large-span steel box girder bridge deck, which adopts a paving structure with an upper layer of epoxy asphalt concrete and a lower layer of poured asphalt concrete, that is, a waterproof layer is provided on the top of the steel box girder bridge deck, a lower bonding layer is provided on the top of the waterproof layer, poured asphalt concrete is provided on the top of the lower bonding layer, an upper bonding layer is provided on the top of the poured asphalt concrete, and epoxy asphalt concrete is provided on the top of the upper bonding layer.

[0004] The prior art has the following deficiencies: currently, steel bridge deck pavement has problems of high temperature drift, rutting and insufficient durability, and double-layer pavement reduces construction efficiency. Summary of the invention

[0005] The object of the present invention is to provide an epoxy asphalt cast concrete paving structure and method thereof, so as to solve the problems of high temperature shift, rutting, insufficient durability and low construction efficiency of steel bridge deck paving.

[0006] In order to achieve the above object, the present invention provides an epoxy asphalt cast concrete paving structure, comprising a sandblasted and rust-removed steel bridge deck, an anti-corrosion layer and a waterproof bonding layer, characterized in that: it also includes an epoxy asphalt cast concrete paving layer and wear-resistant aggregate;

[0007] Epoxy asphalt cast concrete includes: Component A is epoxy resin main agent, including epoxy resin, active diluent and low viscosity inactive diluent, the proportion of which is 90 to 120 parts: 5 to 30 parts: 5 to 20 parts;

[0008] Component B is a curing agent, which is a compound of a long-chain aliphatic primary amine, alicyclic diamine and polyamide curing agent, with a ratio of 60 to 85 parts: 5 to 15 parts: 10 to 25 parts;

[0009] Component C is petroleum asphalt;

[0010] It is made by mixing component A, component B, component C and stone.

[0011] Furthermore, component A and component B are mixed in a ratio of 80 to 100 parts: 40 to 80 parts to form an epoxy resin binder; the epoxy resin binder and component C are mixed in a ratio of 30 to 100 parts: 80 to 120 parts to form an epoxy asphalt binder; the epoxy asphalt binder and stone are mixed in a ratio of 60 to 80 parts: 400 to 800 parts to form epoxy asphalt cast concrete.

[0012] In order to improve the anti-skid performance of the pavement layer, the wear-resistant aggregate adopts one or more of basalt particles, corundum particles, ceramic particles or quartz sand particles.

[0013] Furthermore, the particle size of the wear-resistant aggregate is 1.0 mm to 3.0 mm or 3.0 mm to 5.0 mm, the Mohs hardness is ≥ 7, the wear rate is ≤ 0.5%, and the spreading amount is 3 kg / m 2 ~10kg / m 2 .

[0014] In order to achieve long-term protection of the steel bridge deck, the waterproof bonding layer adopts a second-stage reactive epoxy resin adhesive.

[0015] A paving method for an epoxy asphalt cast concrete paving structure comprises the following steps:

[0016] Step 1: Sandblasting and rust removal of steel bridge deck;

[0017] Step 2: Construction of epoxy zinc-rich primer;

[0018] Step 3: Construction of the second-stage reaction type epoxy resin waterproof bonding layer: After the epoxy zinc-rich primer is completely cured, the second-stage reaction type epoxy resin waterproof bonding layer is constructed, with a dosage of 0.3kg / m 2 ~0.6kg / m 2 ;

[0019] Step 4, epoxy asphalt pouring concrete construction: after the second-order reaction type epoxy resin adhesive completes the first-order curing reaction, a certain strength is formed to bear the construction load, and before it is completely cured, the epoxy asphalt pouring concrete is evenly laid on the second-order reaction type epoxy resin waterproof bonding layer;

[0020] Step 5: Construction of wear-resistant aggregate.

[0021] Furthermore, in step 1, the steel bridge deck is sandblasted to remove rust: the cleanliness of the treated steel bridge deck should reach Sa2.5 level, and the roughness should reach 50μm to 100μm.

[0022] In step 4, epoxy asphalt cast concrete is constructed: the construction temperature is 160°C to 185°C, and the paving thickness is 3cm to 7cm.

[0023] In order to improve the anti-skid performance of the pavement layer, in step 5, wear-resistant aggregate construction: after completing the epoxy asphalt cast concrete construction, wear-resistant aggregate is spread synchronously, with a dosage of 3kg / m 2 ~10kg / m 2 .

[0024] Preferably, in step 5, the oily areas are covered with additional wear-resistant aggregate until there is no more oil. After the mixture temperature drops to room temperature, the excess wear-resistant aggregate on the surface is cleaned up, and the buried depth of the wear-resistant aggregate is 1 / 2 to 2 / 3 of the total wear-resistant aggregate.

[0025] Beneficial effects of the present invention:

[0026] 1. The pavement layer of the present invention adopts epoxy asphalt cast concrete, self-leveling construction, small porosity, excellent high temperature performance and fatigue resistance, and can maintain good followability with the steel bridge deck; the use of wear-resistant aggregate can improve the anti-skid performance of the pavement layer; the waterproof adhesive adopts a second-order reaction type epoxy resin adhesive, which has high bonding strength, excellent waterproof performance and good toughness;

[0027] 2. At the construction temperature, the second-order reaction type epoxy resin waterproof binder melts into a liquid state, the coarse aggregate in the epoxy asphalt cast concrete is embedded in the bonding layer, and the second-order reaction type epoxy resin waterproof binder and the epoxy asphalt cast concrete jointly complete the curing reaction to form a tight, impermeable pavement as a whole, thereby achieving long-term protection of the steel bridge deck; as shown in Table 1 of the performance index comparison of the steel bridge deck pavement structure, the 60°C dynamic stability, the 60°C pavement layer and the steel plate shear strength, and the five-point bending fatigue times of the present invention are higher than those of the double-layer pavement structure as a whole, the 60°C dynamic stability reflects the high-temperature rutting resistance, the 60°C pavement layer and the steel plate shear strength reflects the high-temperature shear resistance, the five-point bending fatigue times reflect the durability, and the swing value reflects the anti-skid performance. The pavement structure can well solve the problems of high-temperature shift, rutting, and insufficient durability of the steel bridge deck pavement layer, greatly improve the service life of the steel bridge deck pavement layer, and achieve the effect of replacing the double-layer pavement with a single-layer pavement.

[0028] 3. The paving structure of the present invention is a single-layer paving, which avoids the possible displacement damage of the upper and lower layers of the paving. Compared with the double-layer paving, the paving thickness is thinner, the construction is simpler and the construction efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of the epoxy asphalt cast concrete pavement structure in this embodiment 1.

[0030] Figure numerals: 1. Steel bridge deck after sandblasting and rust removal; 2. Anti-corrosion layer; 3. Waterproof bonding layer; 4. Epoxy asphalt cast concrete paving layer; 5. Wear-resistant aggregate. DETAILED DESCRIPTION

[0031] The specific embodiments of the present invention are further described in detail below, but the present invention is not limited to these embodiments. Without departing from the principle of the present invention, improvements made to the present invention also fall within the protection scope of the claims of the present invention.

[0032] Example 1

[0033] like Figure 1 As shown, an epoxy asphalt cast concrete pavement structure includes a steel bridge deck that has been sandblasted and derusted, an epoxy zinc-rich paint anti-corrosion layer and a second-order reaction type epoxy resin adhesive layer, an epoxy asphalt cast concrete pavement layer and wear-resistant aggregate; the epoxy asphalt cast concrete includes three components: component A, component B, and component C:

[0034] Component A is the epoxy resin main agent, including epoxy resin, active diluent and low-viscosity inactive diluent, in a ratio of 95 parts: 16 parts: 14 parts;

[0035] Component B is a curing agent, which is a compound of a long-chain aliphatic primary amine, alicyclic diamine and polyamide curing agent in a ratio of 70 parts: 10 parts: 20 parts;

[0036] Component C is low-viscosity petroleum asphalt;

[0037] Component A and component B are mixed in a ratio of 90 parts:58 parts to form epoxy resin binder; epoxy resin binder and component C are mixed in a ratio of 50 parts:90 parts to form epoxy asphalt binder; epoxy asphalt binder and stone are mixed in a ratio of 75 parts:600 parts to form epoxy asphalt cast concrete.

[0038] In this embodiment, the wear-resistant aggregate is one or more of basalt particles, corundum particles, ceramic particles or quartz sand particles, with a particle size of 1.0 mm to 3.0 mm or 3.0 mm to 5.0 mm, a Mohs hardness of ≥ 7, a wear rate of ≤ 0.5%, and a spreading amount of 3 kg / m 2 ~10kg / m 2 .

[0039] In this embodiment, the active diluent is one or any combination of monoepoxy glycidyl ether, diepoxy glycidyl ether, triepoxy glycidyl ether, and glycidyl ester; the low-viscosity inactive diluent is 2,2,4-trimethyl-1,3-pentanediol diisobutyrate.

[0040] In this embodiment, according to the test method of (JTG+E20-2011) "Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering" and "Technical Specification for Design and Construction of Highway Steel Bridge Deck Pavement" (JTG / T3364-02-2019), the binder for epoxy asphalt cast concrete: tensile strength ≥1.5MPa, elongation ≥200%, and the time for the viscosity to rise to 500mPa·s at 160°C to 185°C is ≥180min; epoxy asphalt cast concrete is made by uniformly mixing epoxy asphalt and stone in proportion, with a mixing temperature of 160°C to 185°C and a mixing time of 10min to 45min; epoxy asphalt cast concrete: 60°C Marshall stability ≥30kN, porosity ≤1%, 60°C penetration ≤1mm, -10°C low temperature bending strain ≥4.0×10 -3 ; Second-order reaction type epoxy resin adhesive: tensile strength at 23℃ ≥3MPa, elongation at break at 23℃ ≥150%, gel time at 25℃ ≥30min; the bonding strength between the second-order reaction type epoxy resin adhesive layer and the steel bridge deck at 25℃ ≥5MPa, the bonding strength between the second-order reaction type epoxy resin adhesive layer and epoxy asphalt cast concrete at 25℃ ≥2.5MPa.

[0041] A paving method for an epoxy asphalt cast concrete paving structure comprises the following steps:

[0042] Step 1: Sandblasting and rust removal of steel bridge deck: The cleanliness of the treated steel bridge deck should reach Sa2.5 level, and the roughness should reach 50μm~100μm;

[0043] Step 2: Construction of epoxy zinc-rich primer: Complete the construction of epoxy zinc-rich primer within 4 hours after sandblasting and rust removal;

[0044] Step 3: Construction of the second-order reaction type epoxy resin waterproof bonding layer: After the epoxy zinc-rich primer is completely cured, the second-order reaction type epoxy resin waterproof bonding layer is constructed; the second-order reaction type epoxy resin adhesive is composed of an epoxy resin main agent and a curing agent. After stirring at 20℃~35℃ for 1min~3min, it is evenly applied on the steel bridge deck. The application amount is 0.3kg / m 2 ~0.6kg / m 2 After painting, the waterproof bonding layer is sealed and cured until the second-order reaction type epoxy resin adhesive completes the first-order curing reaction, that is, it is not sticky;

[0045] Step 4, epoxy asphalt cast concrete construction: after the second-order reaction type epoxy resin binder completes the first-order curing reaction, a certain strength is formed to bear the construction load, and before it is completely cured, the epoxy asphalt cast concrete is evenly laid on the second-order reaction type epoxy resin waterproof bonding layer, the construction temperature is 160°C to 185°C, and the paving thickness is 3cm to 7cm;

[0046] Step 5: Wear-resistant aggregate construction: After the epoxy asphalt cast concrete construction is completed, wear-resistant aggregate is spread synchronously, with a dosage of 3kg / m 2 ~10kg / m 2 , improve the anti-skid performance of the pavement layer. In some places where oil is spilled, wear-resistant aggregates need to be spread again until there is no more oil spilling. After the temperature of the mixture drops to room temperature, clean up the excess wear-resistant aggregates on the surface. The buried depth of the wear-resistant aggregates is 1 / 2 to 2 / 3 of the whole wear-resistant aggregates, and the rest is exposed outside.

[0047] At the construction temperature, the second-order reaction type epoxy resin waterproof adhesive melts into a liquid state, the coarse aggregate in the epoxy asphalt cast concrete is embedded in the bonding layer, and the second-order reaction type epoxy resin waterproof adhesive and the epoxy asphalt cast concrete jointly complete the curing reaction to form a tight, impermeable pavement as a whole.

[0048] Referring to the "Test Code for Asphalt and Asphalt Mixtures in Highway Engineering" (JTGE20-2011) and the "Technical Specification for Design and Construction of Highway Steel Bridge Deck Pavement" (JTG / T3364-02-2019), the test examples and the performance of the double-layer steel bridge deck pavement structure were tested, and the test results are shown in Table 1.

[0049] Table 1 Performance index of steel bridge deck pavement structure

[0050]

[0051] GA10 represents conventional poured asphalt concrete, SMA10 represents modified asphalt concrete SMA, EA10 represents conventional epoxy asphalt concrete, the dynamic stability at 60℃ reflects the high-temperature rutting resistance, the shear strength between the pavement layer and the steel plate at 60℃ reflects the high-temperature shear resistance, the five-point bending fatigue number reflects the durability, and the swing value reflects the anti-skid performance.

Claims

1. An epoxy asphalt cast concrete pavement structure, comprising a sandblasted and rust-removed steel bridge deck, an anti-corrosion layer and a waterproof bonding layer, characterized in that: Also included are epoxy asphalt cast concrete paving and wear-resistant aggregate; Epoxy asphalt cast concrete includes: Component A is epoxy resin main agent, including epoxy resin, active diluent and low viscosity inactive diluent, the ratio is 90 parts to 120 parts: 5 parts to 30 parts: 5 parts to 20 parts; Component B is a curing agent, which is a compound of long-chain aliphatic primary amine, alicyclic diamine and polyamide curing agent, with a ratio of 60 to 85 parts: 5 to 15 parts: 10 to 25 parts; Component C is petroleum asphalt; It is prepared by mixing component A, component B, component C and stone; Component A and component B are mixed in a ratio of 80 to 100 parts: 40 to 80 parts to form an epoxy resin binder; the epoxy resin binder and component C are mixed in a ratio of 30 to 100 parts: 80 to 120 parts to form an epoxy asphalt binder; the epoxy asphalt binder and stone are mixed in a ratio of 60 to 80 parts: 400 to 800 parts to form epoxy asphalt cast concrete; The waterproof bonding layer adopts a second-stage reactive epoxy resin adhesive; At the construction temperature, the second-order reaction type epoxy resin waterproof adhesive melts into a liquid state, the coarse aggregate in the epoxy asphalt cast concrete is embedded in the bonding layer, and the second-order reaction type epoxy resin waterproof adhesive and the epoxy asphalt cast concrete jointly complete the curing reaction to form a tight, impermeable pavement as a whole.

2. The epoxy asphalt cast concrete paving structure according to claim 1 is characterized in that: The wear-resistant aggregate is one or more of basalt particles, corundum particles, ceramic particles or quartz sand particles.

3. The epoxy asphalt cast concrete pavement structure according to claim 1 or 2, characterized in that: The particle size of wear-resistant aggregate is 1.0mm~3.0mm or 3.0mm~5.0mm, Mohs hardness ≥7, wear rate ≤0.5%, and the spreading amount is 3kg / m 2 ~10kg / m 2 .

4. The paving method of the epoxy asphalt cast concrete paving structure according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: Sandblasting and rust removal of steel bridge deck; Step 2: Construction of epoxy zinc-rich primer; Step 3: Construction of the second-stage reaction type epoxy resin waterproof bonding layer: After the epoxy zinc-rich primer is completely cured, the second-stage reaction type epoxy resin waterproof bonding layer is constructed, with a dosage of 0.3kg / m 2 ~0.6kg / m 2 ; Step 4, epoxy asphalt pouring concrete construction: after the second-order reaction type epoxy resin adhesive completes the first-order curing reaction, a certain strength is formed to bear the construction load, and before it is completely cured, the epoxy asphalt pouring concrete is evenly laid on the second-order reaction type epoxy resin waterproof bonding layer; Step 5: Construction of wear-resistant aggregate.

5. The paving method of the epoxy asphalt cast concrete paving structure according to claim 4, characterized in that: In step 1, the steel bridge deck is sandblasted to remove rust: the cleanliness of the treated steel bridge deck should reach Sa2.5 level, and the roughness should reach 50μm~100μm.

6. The paving method of the epoxy asphalt cast concrete paving structure according to claim 5, characterized in that: In step 4, epoxy asphalt cast concrete construction: the construction temperature is 160℃~185℃, and the paving thickness is 3cm~7cm.

7. The paving method of the epoxy asphalt cast concrete paving structure according to any one of claims 4 to 6, characterized in that: In step 5, wear-resistant aggregate construction: after completing the construction of epoxy asphalt cast concrete, wear-resistant aggregate is spread simultaneously. Wear-resistant aggregate is spread in oily areas until there is no more oil. After the temperature of the mixture drops to room temperature, excess wear-resistant aggregate on the surface is cleaned. The burial depth of wear-resistant aggregate is 1 / 2~2 / 3 of the total wear-resistant aggregate.

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