An ecological high-strength cement concrete pavement compaction and forming method

Abstract

The present invention provides a compaction and forming method for an ecological high-strength cement concrete pavement, mainly including: Step 1, determining the standard theoretical density through calculation; Step 2, determining the target compaction degree of rolling through an axial compressive strength test; Step 3, calculating the compaction work required during the forming process of indoor specimens by fitting the pressure-displacement relationship curve during the specimen forming process and integrating; Step 4, calculating the tonnage of the roller used for on-site pavement rolling through the equivalent relationship of compaction work per unit density change; Step 5, determining the number of roller passes through on-site concrete trial paving; Step 6, after the paving and rolling are completed, spraying an epoxy resin strong glue and a protective agent on the pavement surface. The method of the present invention performs fully mechanized paving and rolling control on the ecological high-strength cement concrete pavement, can determine quantitative compaction control indicators and an integrated construction process, and ensure the high strength of the concrete pavement.

Description

Technical Field

[0001] The present invention relates to the technical field of information models, and in particular to the application of information model technology in pavement engineering. The present invention proposes an ecological high-strength cement concrete pavement compaction and forming method. Background Art

[0002] The permeable cement concrete pavement has a good drainage and noise reduction effect due to its large pore structure, and thus has a good ecological and environmental protection effect. Conventional pavements rely on manual paving and small plate rammers for compaction during the forming process, lacking quantitative compaction control indicators and integrated construction techniques during the construction process, resulting in a small strength of the formed concrete pavement and difficult quality control. Summary of the Invention

[0003] To solve the problem that the lack of quantitative compaction control indicators and integrated construction techniques during the construction process leads to a small strength of the formed concrete pavement and difficult quality control, the present invention proposes an ecological high-strength cement concrete pavement compaction and forming method.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] An ecological high-strength cement concrete pavement compaction and forming method, comprising the following steps:

[0006] Step 1, determining the standard theoretical density through calculation;

[0007] Step 2, determining the target compaction degree of rolling through an axial compressive strength test;

[0008] Step 3, calculating the compaction work required during the forming process of indoor specimens by fitting the pressure-displacement relationship curve during the forming process of the specimens and integrating;

[0009] Step 4, calculating the tonnage of the roller used for on-site rolling of the pavement through the equivalent relationship of compaction work per unit density change;

[0010] Step 5, determining the number of rolling passes of the roller through on-site concrete trial paving;

[0011] Step 6, after the paving and rolling are completed, spraying epoxy resin strong glue and protective agent on the pavement surface.

[0012] Further technical solution of the present invention:

[0013] Preferably, Step 1 includes:

[0014]

[0015] ρ se = C×ρ sa +(1 - C)×ρsb (2)

[0016]

[0017] In the formula: ρ ti — Standard theoretical density of eco - type cement concrete, dimensionless;

[0018] P ai — Ratio of the sum of the masses of water, cement, enhancer and admixture (gel) to the sum of the masses of coarse aggregate and fine aggregate (stone) in eco - type cement concrete, %;

[0019] ρ se — Effective relative density of aggregate in eco - type cement concrete, dimensionless;

[0020] ρ b — Relative density of water, cement, enhancer and admixture (gel) in eco - type cement concrete, dimensionless;

[0021] C — Gel absorption coefficient of stone;

[0022] W x — Water absorption rate of synthetic stone;

[0023] ρ sa — Synthetic bulk relative density of stone;

[0024] ρ sb — Synthetic apparent relative density of stone;

[0025] P1, P2 — Mixing ratios of various stone components of coarse aggregate and fine aggregate, and their sum is 100;

[0026] ρ1, ρ2 — Bulk relative densities of various stone components of coarse aggregate and fine aggregate;

[0027] ρ′1, ρ′2 — Apparent relative densities of various stone components of coarse aggregate and fine aggregate.

[0028] Preferably, step two includes:

[0029] (1) Molding specimens according to different compaction degrees A (92%, 94%, 96%, 98%, 100%, etc.). The molding method is as follows: Use a cylindrical mold with a diameter and height of 150 mm, and there are bases at both the top and bottom (the thickness of the base is 2.5 cm). The masses of concrete filled in are respectively: A * ρ ti * 3.14 * 0.15 * 0.15 * 0.1. After filling, place it on a static press, start the static press, align the pressing head with the upper base and press down until the upper base is flush with the surface of the mold.

[0030] (2) The formed specimens are cured under standard curing conditions for 7 days, and then their axial compressive strengths are tested. Draw the curve of axial compressive strength varying with density, and take the compaction degree when the strength reaches the maximum value as the compaction degree that needs to be controlled for on-site road surface rolling.

[0031] Preferably, step three includes:

[0032] Import the pressure-displacement curve data of the static press under the determined optimal compaction degree conditions into an EXCEL table, fit the relational function of the pressure-displacement curve (R2≥0.8), and then integrate and evaluate the displacement during the compaction process to calculate the compaction work Wcomp consumed during the rolling of the specimen.

[0033] Preferably, step four includes:

[0034] Calculate the tonnage of the roller used for on-site road surface rolling according to the following formula.

[0035]

[0036] In the formula: W 压 —The compaction work during the compaction of the specimen in the laboratory, J;

[0037] ρ 压 —The density of the concrete in the final compacted state, kg / m 3 ;

[0038] ρ 松 —The density of the concrete when it is first loaded into the test mold, kg / m 3 ;

[0039] ρ 摊 —The density of the concrete when the paver has just finished paving the road surface, kg / m 3 ;

[0040] G—The tonnage of the roller;

[0041] k—The loose paving coefficient;

[0042] H—The thickness of the road surface.

[0043] Preferably, step five includes:

[0044] Conduct on-site concrete trial paving, use the determined tonnage roller for rolling and synchronously detect the density. The number of rolling passes after reaching the target compaction degree is the number of rolling passes of the construction roller.

[0045] Preferably, step six includes:

[0046] After using the roller for paving and completing the rolling, first spray epoxy resin strong glue on the road surface (the spraying amount is 2.5 - 3.0 kg / m 2), and then spraying a protective agent on the surface (the spraying amount is 1 - 1.5 kg / m 2 ), to form an ecological high-strength cement concrete pavement.

[0047] The beneficial effects of the present invention are as follows:

[0048] The forming method proposed by the present invention adds a reinforcing agent material on the basis of considering high strength, proposes the concept of the maximum theoretical density of ecological cement concrete, obtains the standard theoretical density through model calculation, determines the concrete compaction degree at the maximum strength by forming cylindrical specimens with different compaction degrees indoors, calculates the tonnage parameter of the roller used on the road surface rolling site through the equivalent calculation of the compaction work of the press when controlling the compaction degree, and supplements with on-site tests to determine the number of rolling passes of the roller. Finally, spraying epoxy resin strong glue and a protective agent on the surface of the rolled road surface to form an ecological high-strength cement concrete pavement, realizing the full mechanized construction of the ecological high-strength cement concrete pavement and ensuring the rolling quality of the road surface. Description of the Drawings

[0049] Figure 1 It is the curve graph of the change of the axial compressive strength of concrete under different compaction degree conditions in Step 2 (A is the target compaction degree);

[0050] Figure 2 It is the pressure-displacement relationship curve in Step 3. Detailed Embodiments

[0051] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described here are only used to explain the present description and are not used to limit the present invention.

[0052] Embodiment 1: A compaction and forming method for an ecological high-strength cement concrete pavement, comprising the following steps:

[0053] Step 1, determining the standard theoretical density through calculation;

[0054] Step 2, determining the target compaction degree of rolling through the axial compressive strength test;

[0055] Step 3, calculating the compaction work required during the forming process of indoor specimens by fitting the pressure-displacement relationship curve during the forming process of specimens and integrating;

[0056] Step 4, calculating the tonnage of the roller used for on-site rolling of the road surface through the equivalent relationship of the compaction work per unit density change;

[0057] Step 5, determining the number of rolling passes of the roller through on-site concrete trial paving;

[0058] Step 6: After paving and rolling are completed, spray epoxy resin strong glue and protective agent on the road surface.

[0059] For a project of a square in a highway service area, an ecological high-strength cement concrete pavement is planned to be paved. Through preliminary design, the mix ratio of each component per cubic meter of concrete is as follows: coarse aggregate: fine aggregate: cement: water: enhancer: water reducer = 1381.6 kg: 188.4 kg: 451.5 kg: 128.7 kg: 12.9 kg: 0.9 kg. The bulk relative density and apparent relative density of the coarse aggregate are 2.591 and 2.624 respectively. The bulk relative density and apparent relative density of the fine aggregate are 2.546 and 2.606 respectively.

[0060] 1) Step 1: The standard theoretical density calculation includes:

[0061] Step 1 includes:

[0062]

[0063] ρ se = C × ρ sa + (1 - C) × ρ sb (2)

[0064]

[0065] In the formula: ρ ti —The standard theoretical density of ecological cement concrete, dimensionless;

[0066] P ai —The ratio of the sum of the masses of water, cement, enhancer and admixture (gel) in ecological cement concrete to the sum of the masses of coarse aggregate and fine aggregate (stone material), %;

[0067] ρ se —The effective relative density of ecological cement concrete aggregate, dimensionless;

[0068] ρ b —The relative density of water, cement, enhancer and admixture (gel) in ecological cement concrete, dimensionless;

[0069] C—The gel absorption coefficient of stone material;

[0070] W x —The water absorption rate of synthetic stone material;

[0071] ρ sa —The synthetic bulk relative density of stone material;

[0072] ρ sb —The synthetic apparent relative density of stone material;

[0073] P1, P2—the mix ratios of various stone components of coarse aggregate and fine aggregate, and their sum is 100;

[0074] ρ1, ρ2—the bulk relative density of various stone components of coarse aggregate and fine aggregate;

[0075] ρ1 ′ 、ρ ′ 2—the apparent relative density of various stone components of coarse aggregate and fine aggregate.

[0076] The synthetic bulk relative density calculated from Equation (5) and Equation (6) is 2.586, and the synthetic apparent relative density is 2.622; the water absorption rate of the synthetic stone calculated from Equation (4) is 0.005; the gel absorption coefficient of the stone calculated from Equation (2) is 0.998; the mass ratio of the gel (cement: water: enhancer: water reducer) to the stone (coarse aggregate: fine aggregate) in the concrete is 0.38, the mass ratio of the coarse aggregate to the fine aggregate is 88:12, and the standard theoretical density calculated from Equation (2) is 2627 kg / m 3 .

[0077] 2) Step two, calculate the mass of concrete to be filled in a single specimen mold according to different compaction degrees (92%, 94%, 96%, 98%, 100%).

[0078] Mass of concrete to be filled in a single specimen mold at different compaction degrees

[0079]

[0080] After filling, place it on the static press, start the static press, align the pressure head downward to compact until the upper base is flush with the surface of the test mold. Cure the formed specimen under standard curing conditions for 7 days, then test its axial compressive strength, and draw the change curve of the axial compressive strength with density as Figure 1 shown. Take the compaction degree of 96% when the strength reaches the maximum value as the compaction degree (target compaction degree) to be controlled for on-site road surface rolling.

[0081] 3) Step three, export the relationship curve of the static press load and displacement during the specimen forming process under the condition of 96% compaction degree, as Figure 2 shown. The fitting relationship equation of the curve is y = 00037x - 3.8248, and integrate the displacement to obtain the compaction work during the compaction process as 105 J.

[0082] 4) Step four, the density of the concrete in the final compaction state is 2627 * 96% = 2522 kg / m 3 , and the density of the concrete measured in the laboratory when it is just filled into the test mold is 1580 kg / m 3, and the concrete density when the paver has just finished paving the road surface is 2100 kg / m 3 . The loose paving coefficient is set at 1.2, and the road surface thickness is 10 cm.

[0083] According to Equation (7), the tonnage of the roller used for on-site compaction of the road surface is calculated to be 1.05, that is, a roller of at least 1 t is used for on-site compaction.

[0084]

[0085] In the formula: W_compaction—the compaction work during the compaction process of the specimen in the laboratory, J;

[0086] ρ 压 —the concrete density in the final compacted state, kg / m 3 ;

[0087] ρ 松 —the concrete density when it is just loaded into the test mold, kg / m 3 ;

[0088] ρ 摊 —the concrete density when the paver has just finished paving the road surface, kg / m 3 ;

[0089] G—the tonnage of the roller;

[0090] k—the loose paving coefficient;

[0091] H—the road surface thickness.

[0092] 5) Step Five, conduct on-site concrete trial paving, use a 1 t roller for compaction and synchronously detect the density. After reaching 96% compaction degree, roll back and forth 3 times, then the number of rolling passes of the roller for on-site construction is 3 passes (back and forth).

[0093] 6) Step Six, after paving with a roller and completing compaction with the roller, first spray epoxy resin strong glue on the road surface (spraying amount is 2.5 - 3.0 kg / m 2 ), and then spray a protective agent on the surface (spraying amount is 1 - 1.5 kg / m 2 ), to form an ecological high-strength cement concrete road surface.

[0094] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An ecological high-strength cement concrete pavement compaction and forming method, characterized in that It includes the following steps: Step 1, determine the standard theoretical density through calculation; Step 1 includes: ρ se = C × ρ sa + (1 - C) × ρ sb (2) C = 0.04×W x 2 - 0.4W x + 1 (3) Where: ρ ti — Standard theoretical density of eco-cement concrete, dimensionless; P ai — Ratio of sum of masses of water, cement, enhancer and admixture to sum of masses of coarse aggregate and fine aggregate in eco-cement concrete, %; ρ se — Effective relative density of eco-cement concrete aggregate, dimensionless; ρ b — Relative density of water, cement, enhancer and admixture in ecological cement concrete, dimensionless; C—the gel absorption coefficient of the stone material; W x — Water absorption rate of synthetic stone ρ sa — Bulk relative density of the synthetic aggregate ρ sb — Apparent relative density of the synthetic stone material; P1, P2—the mix ratios of various stone components of the coarse aggregate and the fine aggregate, and their sum is 100; ρ1, ρ2—the bulk relative density of various stone components of the coarse aggregate and the fine aggregate; ρ1 ′ , ρ ′ 2—the apparent relative density of various stone components of coarse and fine aggregates; Step 2, determine the target compaction degree through the axial compressive strength test; Step 2 includes: (1)Mold specimens according to different compaction degrees A, and the molding method is as follows: Use a cylindrical mold with a diameter and height of 150 mm, with bases at both the top and bottom. The thickness of the base is 2.5 cm, and the mass of the concrete filled in is: A * ρ ti * 3.14 * 0.15 * 0.15 * 0.

1. After filling, place it on a static press, start the static press, align the pressing head with the upper base and press down until the upper base is flush with the surface of the mold; (2) After the formed specimen is cured under standard curing conditions for 7 days, detect its axial compressive strength, draw the curve of the axial compressive strength varying with the compaction degree, and take the compaction degree when the strength reaches the maximum value as the compaction degree that needs to be controlled for the on-site pavement rolling; Step 3, calculate the compaction work required during the indoor specimen forming process by fitting the pressure-displacement relationship curve during the specimen forming process and integrating; Step 4, calculate the tonnage of the roller used for on-site pavement rolling through the equivalent relationship of the compaction work per unit density change; Step 5, determine the number of roller passes through on-site concrete trial paving; Step 6, after the paving and rolling are completed, spray epoxy resin strong glue and a protective agent on the road surface.

2. The compaction and forming method of an ecological high-strength cement concrete pavement according to claim 1, characterized in that Step 3 includes: Import the pressure-displacement curve data of the static press under the determined optimum compaction degree condition into the EXCEL table, fit the relationship function of the pressure-displacement curve, R2≥0.8, and then integrate and evaluate the displacement during the compaction process to calculate the compaction work Wcomp consumed during the specimen rolling process.

3. An ecological high-strength cement concrete pavement compaction and forming method according to claim 1, characterized in that, Step 4 includes: Calculate the tonnage of the roller used for on-site pavement rolling according to the following formula; Where: W 压 — Compaction work during the compaction process of the specimen in the laboratory, J; ρ 压 — Concrete density in the final compacted state, kg / m 3 ; ρ 松 —Density of concrete in the loose state when initially placed in the test mold, kg / m3; ρ 摊 — Density of concrete when the paver has just finished paving the road surface, kg / m3; G—the tonnage of the roller; k—the loose paving coefficient; H—the thickness of the road surface.

4. An ecological high-strength cement concrete pavement compaction and forming method according to claim 1, characterized in that, Step 5 includes: Conduct on-site concrete trial paving, use the determined tonnage roller for rolling and synchronously detect the density, and the number of roller passes after reaching the target compaction degree is the number of roller passes for the construction roller.

5. A compaction and forming method for an ecological high-strength cement concrete road surface according to claim 1, characterized in that, Step 6 includes: After using the roller for paving and completing the rolling by the roller, first spray epoxy resin strong glue on the road surface, and then spray a protective agent on the surface to form an ecological high-strength cement concrete pavement.

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