A high-speed rail tunnel disease rapid repair material and a preparation method thereof

Abstract

The application discloses a kind of high-speed rail tunnel disease rapid repair materials, by mass parts, including the following components: cement 200-250 parts, superfine fly ash floating bead 100-150 parts, anti-cracking agent 40-50 parts, interface repair agent 40-50 parts, rheological modification material 40-50 parts, coarse aggregate 850-900 parts, fine aggregate 850-900 parts, water reducing agent 4-5 parts;The anti-cracking agent, by mass parts, includes the following components: MgO 40-50 parts, CaO 40-60 parts, Al2O3 10-15 parts, quartz powder 1-5 parts.The effect of anti-cracking agent, interface repair agent, superfine fly ash floating bead and rheological modification material can realize the characteristics of high early strength, short curing time and strong interface bonding, reduce downtime, thereby providing economic benefits for tunnel maintenance and repair.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of tunnel engineering materials, and particularly relates to a high-speed rail tunnel disease rapid repair material and a preparation method thereof. BACKGROUND

[0002] The statements herein are provided only to enhance understanding of the present application and are not necessarily intended to constitute the prior art.

[0003] In the process of high-speed railway tunnel construction, tunnel lining structure diseases are inevitable, and lining structure cracks are the most common one. The cracks not only damage the appearance of the structure, but also provide a channel for the erosion of underground water, causing steel corrosion, concrete corrosion and the like, and further shortening the maintenance period and service life of the tunnel. If the lining cracks are not timely treated, the lining structure will be further damaged, and in the extreme case, the structure may collapse as a whole, which seriously threatens the safety of driving in the tunnel. The traditional cement-based repair material has the problems of poor crack resistance, high cost, poor early strength performance, easy secondary cracking and the like, the repair bonding interface is a weak surface in the repaired structure, is easily affected by the external erosive substances, and is prone to property deterioration, which causes the structure repair to fail, and therefore, it is urgent to develop a high-speed rail tunnel lining rapid reinforcement interface strong bonding repair material. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application aims to provide a high-speed rail tunnel disease rapid repair material and a preparation method thereof. The repair material has the characteristics of high early strength, strong crack resistance, low shrinkage, good compatibility with the high-speed rail tunnel structure and high interface bonding strength in terms of performance; in terms of construction, the repair material has the advantages of simple construction, convenient operation, effective reduction of the number of personnel required for construction, improvement of efficiency, reduction of tunnel repair cost, and great economic and social benefits.

[0005] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0006] In a first aspect, the present application provides a high-speed rail tunnel disease rapid repair material, which comprises the following components in parts by mass: cement 200-250 parts, superfine fly ash floating beads 100-150 parts, crack resistance agent 40-50 parts, interface repair agent 40-50 parts, rheological modification material 40-50 parts, coarse aggregate 850-900 parts, fine aggregate 850-900 parts, and water reducing agent 4-5 parts.

[0007] The crack resistance agent comprises the following components in parts by mass: MgO 40-50 parts, CaO 40-60 parts, Al2O3 10-15 parts, and quartz powder 1-5 parts.

[0008] The high-speed repair material for tunnel diseases has the following components and functions:

[0009] The superfine fly ash floating bead is a fly ash hollow sphere that can float on the water surface, and has a particle size less than 10 μm. The superfine fly ash floating bead has the function of improving the strength and durability of the material.

[0010] In the anti-cracking agent, MgO compensates for the temperature shrinkage and dry shrinkage of the material, CaO compensates for the temperature shrinkage and dry shrinkage of the material, Al2O3 reduces the shrinkage and cracking of the material, and the quartz powder improves the fluidity of the material.

[0011] The interface repair agent has the function of improving the adhesion effect of the material base surface and realizing the integration of the interface.

[0012] The rheological modification material has the function of reducing the viscosity of the material and improving the flow performance of the material.

[0013] In some embodiments, the high-speed repair material for tunnel diseases comprises the following components by mass fraction: cement 220-240 parts, superfine fly ash floating bead 130-140 parts, anti-cracking agent 40-50 parts, interface repair agent 40-50 parts, rheological modification material 40-50 parts, coarse aggregate 870-900 parts, fine aggregate 870-900 parts, and water reducing agent 4-5 parts.

[0014] The anti-cracking agent comprises the following components by mass fraction: MgO 45-50 parts, CaO 45-55 parts, Al2O3 10-14 parts, and quartz powder 1-3 parts.

[0015] In some embodiments, the interface repair agent is a water-based interface treatment agent made of a permeable crystalline material.

[0016] Preferably, the permeable crystalline material is a common cement-based permeable crystalline material.

[0017] In some embodiments, the rheological modification material is silica fume.

[0018] In some embodiments, the cement is ordinary Portland cement.

[0019] In some embodiments, the superfine fly ash floating bead is grade I, has a burning vector not greater than 2%, and has a specific surface area greater than 600 cm 2 / g.

[0020] In some embodiments, the fine aggregate is Yellow River sand, has a fineness modulus of 3-2.3, a particle size of 0.5-0.35 mm, and an average particle size of 0.4 mm.

[0021] In some embodiments, the coarse aggregate is basalt gravel, has a particle size of 5-15 mm, and an average particle size of 11 mm.

[0022] In some embodiments, the water reducing agent is a polycarboxylate high performance water reducing agent. The solid content is 20%, the pH value is about 7.5, and the water reducing rate is more than 30%.

[0023] In some embodiments, the high-speed repair material for tunnel diseases of high-speed rail further comprises water 150-200 parts.

[0024] In a second aspect, the application provides a preparation method of the high-speed repair material for tunnel diseases of high-speed rail, comprising the following steps:

[0025] The cement, the anti-cracking agent, the interface repair agent, the ultra-fine fly ash floating bead, the rheological modification material, the coarse aggregate and the fine aggregate are mixed uniformly according to the proportions to obtain a mixture;

[0026] The water reducing agent and part of the water are added to the mixture and mixed uniformly to obtain a viscous slurry;

[0027] The viscous slurry is mixed with the remaining water uniformly to obtain the repair material.

[0028] The beneficial effects achieved by one or more embodiments of the application are as follows:

[0029] (1) In the repair material formula and preparation process provided by the application, the addition of auxiliary materials such as the anti-cracking agent can effectively reduce the formation and development of tunnel cracks. At the same time, the material shows high early strength, which means that sufficient strength can be obtained soon after construction, which helps to improve the use speed of the tunnel.

[0030] (2) In the repair material formula and preparation process of the application, the addition of auxiliary materials such as the interface repair agent makes the repair material have good compatibility with the high-speed rail tunnel structure, can be well bonded with the existing structure, and will not cause instability or compatibility problems. This means that it can be widely used for the repair and maintenance of high-speed rail tunnels, without the need for large-scale modification of the original structure, can effectively improve the bonding strength with the damaged surface of the lining and realize the integration of the repair interface.

[0031] (3) The repair material provided by the application uses a large amount of industrial solid waste such as ultra-fine fly ash floating bead, which is low in price and large in reserves, effectively reduces the cost of the repair material, solves the problem of a large amount of industrial solid waste in China, is energy-saving and environmentally friendly, and meets the development requirements of the state for environmental protection.

[0032] (4) The grouting material described in the application can achieve the characteristics of high early strength, short curing time and strong interface bonding through the effects of the anti-cracking agent, the interface repair agent, the ultra-fine fly ash floating bead and the rheological modification material, can effectively inhibit the shrinkage of the material, enhance the bonding force between the material and the original structure, overcome the problems of large brittleness and poor durability of traditional materials, effectively solve the problem of secondary cracking, and has a simple maintenance method and is convenient for practical engineering application.

[0033] (5) The repair material has the advantages of simple construction, convenient operation, effective reduction of the number of personnel required for construction, improved efficiency, reduced tunnel repair cost, great economic and social benefits. DETAILED DESCRIPTION

[0034] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0035] The present application will be further described below in conjunction with examples.

[0036] Example 1

[0037] A high-speed rail tunnel disease rapid repair material, by mass fraction, the components are as follows: ordinary Portland cement 225 parts, superfine fly ash floating beads 135 parts, anti-cracking agent 45 parts, interface repair agent 45 parts, rheological modifier silica fume 45 parts, coarse aggregate 890 parts, fine aggregate 890 parts, polycarboxylic acid type water reducing agent 4.5 parts, water 162 parts.

[0038] The anti-cracking agent comprises the following components by mass fraction: MgO 48 parts, CaO 50 parts, Al2O3 12 parts, and quartz powder 2 parts.

[0039] The interface repair agent is a water-based interface treatment agent made of ordinary cement-based penetrating crystalline material.

[0040] The superfine fly ash floating beads are grade I, with a burning vector of not greater than 2% and a specific surface area of greater than 600 cm 2 / g.

[0041] The fine aggregate is Yellow River medium sand, with a fineness modulus of 3-2.3, a particle size of 0.5-0.35 mm, and an average particle size of 0.4 mm.

[0042] The coarse aggregate is basalt crushed stone, with a particle size of 5-15 mm and an average particle size of 11 mm.

[0043] The preparation method of the high-speed rail tunnel disease rapid repair material is as follows:

[0044] Step 1: weigh the aggregate according to the mixing ratio, pour it into a mixer, and stir uniformly at 60 r / min for 3-5 min to form a mixture;

[0045] Step 2: weigh the cement, anti-cracking agent, interface repair agent, superfine fly ash floating beads, and rheological modifier into the mixer, and stir for 3 min to uniformly mix the aggregate and cementitious materials;

[0046] Step 3: Pour the polycarboxylic acid superplasticizer and the designed amount of 70% water into the mixer, stir for 3 min, and form a viscous slurry;

[0047] Step 4: Pour the remaining water into the viscous slurry in step 3, stir for 2-3 min;

[0048] Step 5: Observe the fluidity of the mixture, and discharge when the requirements are met to obtain the prepared mixed material; and shape and maintain.

[0049] Slump flow test: Place the slump flow spreader on the horizontal ground, place the slump flow cylinder at the center of the spreader, and wipe the surface of the slump flow cylinder and the spreader with a wet cloth. Pour the well-mixed cement-based material into the slump flow cylinder, and press the two sides of the cylinder with your feet to prevent it from slipping during the pouring process. After pouring is complete, use a spatula to remove the excess cement-based material on the top surface. Then, vertically and smoothly lift the slump flow cylinder to allow the material to flow freely, and record the average diameter in the perpendicular direction when the material stops flowing, which is the spread.

[0050] Cracking area test: Use a flat plate type test piece with dimensions of 800 mm x 600 mm x 100 mm. The four edges of the mold are welded with angle steel, the side plate thickness is 5 mm, and the four edges and the bottom plate of the mold are fixed and connected with bolts. There should be 7 crack inducers in the mold. The crack inducers can be welded with 5 mm x 50 mm steel plates and 50 mm x 50 mm, 40 mm x 40 mm angle steel respectively, and are parallel to the short edges of the mold. The bottom surface is covered with a polytetrafluoroethylene sheet or a polyethylene film as a separation layer, and there are 2 test pieces in each group. The test should be carried out in a constant temperature and humidity room with a temperature of (20±2)℃ and a relative humidity of (60±5)%. Since the thickness, density and flatness of the test piece have a great influence on the test results, immediately after pouring the cement-based material into the mold, spread the material evenly, and the surface of the material is slightly higher than the frame of the mold. Use a flat plate surface vibrator to fully vibrate. After vibration, quickly level the surface with a trowel, and the aggregate should not be exposed, and the surface should be flat and solid. After 30 min of test piece molding, immediately adjust the position and wind speed of the fan to control the wind speed at 100 mm above the center of the test piece surface to be (5.0±0.5) m / s, and the wind direction is parallel to the test piece surface and the crack inducer. The test time is calculated from the start of material mixing and water addition, and the crack is measured at the specified time of (24.0±0.5) h. The crack length is measured with a steel ruler, and the maximum width of each crack is measured with a 40 times crack width measuring instrument.

[0051] The average cracking area of each crack should be calculated according to the following formula:

[0052]

[0053] The number of cracks per unit area should be calculated according to the following formula:

[0054]

[0055] The total cracking area per unit area should be calculated according to the following formula:

[0056] c = a.b;

[0057] In the formula, W i - the maximum width (mm) of the i-th crack, accurate to 0.01 mm;

[0058] Li - the length (mm) of the i-th crack, accurate to 1 mm;

[0059] N - the total number of cracks (pieces);

[0060] A - the area (m 2 ) of the flat plate, accurate to two decimal places;

[0061] a - the average cracking area (mm 2 / piece) of each crack, accurate to 1 mm 2 / piece;

[0062] b - the number of cracks per unit area (pieces / m 2 ), accurate to 0.1 pieces / m 2 ;

[0063] c - the total cracking area per unit area (mm 2 / m 2 ), accurate to 1 mm 2 / m 2 .

[0064] The performance test results of the high-iron tunnel repair material prepared in this example are: expansion degree 625 mm, 3d cubic compressive strength 20.1 MPa, 7d cubic compressive strength 38.4 MPa, 28d cubic compressive strength 48.9 MPa, impermeability grade P8, total cracking area per unit area 246.24 mm 2 / m 2 , bonding tensile strength f AT = 1.8 MPa.

[0065] Example 2

[0066] A high-iron tunnel disease rapid repair material, by mass fraction, the components are as follows: ordinary Portland cement 200 parts, superfine fly ash floating bead 115 parts, anti-cracking agent 40 parts, ordinary cement-based permeable crystalline material interface repair agent 40 parts, rheological modifier silica fume 50 parts, coarse aggregate 850 parts, fine aggregate 850 parts, polycarboxylic acid type water reducing agent 4.5 parts, water 162 parts.

[0067] The anti-cracking agent comprises the following components by mass fraction: MgO 45 parts, CaO 55 parts, Al2O3 14 parts, and quartz powder 3 parts.

[0068] The superfine fly ash floating bead is grade I, the burning vector is not greater than 2%, and the specific surface area is greater than 600 cm 2 / g.

[0069] The fine aggregate is the Yellow River medium sand, the fineness modulus is 3-2.3, the particle size is 0.5-0.35 mm, and the average particle size is 0.4 mm.

[0070] The coarse aggregate is basalt gravel, the particle size is 5-15 mm, and the average particle size is 11 mm.

[0071] The preparation method of the high-speed railway tunnel disease rapid repair material is the same as that in Embodiment 1.

[0072] The performance test result of the high-speed railway tunnel repair material prepared in the embodiment is as follows: the expansion degree is 620 mm, the 3d cubic compressive strength is 19.8 MPa, the 7d cubic compressive strength is 38.0 MPa, the 28d cubic compressive strength is 48.5 MPa, the impermeability grade is P8, the total cracking area on the unit area is 263.95 mm 2 / m 2 , the bonding tensile strength f AT = 1.5 MPa.

[0073] Embodiment 3

[0074] A high-speed railway tunnel disease rapid repair material comprises the following components by mass fraction: ordinary Portland cement 240 parts, superfine fly ash floating bead 100 parts, anti-cracking agent 50 parts, ordinary cement-based penetrating crystalline material interface repair agent 40 parts, rheological modification material silica ash 40 parts, coarse aggregate 870 parts, fine aggregate 870 parts, polycarboxylic acid type water reducing agent 4 parts, and water 165 parts.

[0075] The anti-cracking agent comprises the following components by mass fraction: MgO 50 parts, CaO 45 parts, Al2O3 10 parts, and quartz powder 1 part.

[0076] The superfine fly ash floating bead is grade I, the burning vector is not greater than 2%, and the specific surface area is greater than 600 cm 2 / g.

[0077] The fine aggregate is the Yellow River medium sand, the fineness modulus is 3-2.3, the particle size is 0.5-0.35 mm, and the average particle size is 0.4 mm.

[0078] The coarse aggregate is basalt gravel, the particle size is 5-15 mm, and the average particle size is 11 mm.

[0079] The preparation method of the high-speed railway tunnel disease rapid repair material is the same as that in Example 1.

[0080] The performance test results of the high-speed railway tunnel repair material prepared in this example are: an extension degree of 634 mm, a 3d cubic compressive strength of 20.5 MPa, a 7d cubic compressive strength of 39.2 MPa, a 28d cubic compressive strength of 50.1 MPa, an impermeability grade P8, a total cracking area on a unit area of 257.03 mm 2 / m 2 , and a bonding tensile strength f AT = 2.0 MPa.

[0081] Comparative Example 1

[0082] The difference from Example 1 is that the anti-cracking agent is omitted, and the others are the same as those in Example 1.

[0083] The performance test results of the high-speed railway tunnel repair material prepared are: an extension degree of 600 mm, a 3d cubic compressive strength of 18.5 MPa, a 7d cubic compressive strength of 38.2 MPa, a 28d cubic compressive strength of 47.9 MPa, an impermeability grade P8, a total cracking area on a unit area of 265.79 mm 2 / m 2 , and a bonding tensile strength f AT = 1.5 MPa.

[0084] Comparative Example 2

[0085] The difference from Example 1 is that the interface repair agent is omitted, and the others are the same as those in Example 1.

[0086] The extension degree is 610 mm, the 3d cubic compressive strength is 18.7 MPa, the 7d cubic compressive strength is 37.6 MPa, the 28d cubic compressive strength is 47.8 MPa, the impermeability grade is P8, the total cracking area on a unit area is 261.31 mm 2 / m 2 , and the bonding tensile strength f AT = 1.2 MPa.

[0087] Comparative Example 3

[0088] The difference from Example 1 is that the rheological modification material is omitted, and the others are the same as those in Example 1.

[0089] The extension degree is 600 mm, the 3d cubic compressive strength is 18.7 MPa, the 7d cubic compressive strength is 37.9 MPa, the 28d cubic compressive strength is 47.6 MPa, the impermeability grade is P8, the total cracking area on a unit area is 262.38 mm 2 / m 2 , and the bonding tensile strength f AT= 1.6 MPa.

[0090] Comparative Example 4

[0091] The difference from Example 1 is that the superfine fly ash floating beads are omitted, and the others are the same as Example 1.

[0092] The expansion degree is 610 mm, the 3d cubic compressive strength is 18.5 MPa, the 7d cubic compressive strength is 38 MPa, the 28d cubic compressive strength is 47.8 MPa, the impermeability grade is P8, and the total cracking area on the unit area is 270 mm 2 / m 2 , the bonding tensile strength f AT = 1.6 MPa.

[0093] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A rapid repair material for defects in high-speed railway tunnels, characterized in that: By weight, it includes the following components: 200-250 parts cement, 100-150 parts ultrafine fly ash cenospheres, 40-50 parts crack-resistant agent, 40-50 parts interface repair agent, 40-50 parts rheology modifier, 850-900 parts coarse aggregate, 850-900 parts fine aggregate, and 4-5 parts water-reducing agent. The crack-resistant agent, by weight, comprises the following components: 40-50 parts MgO, 40-60 parts CaO, 10-15 parts Al2O3, and 1-5 parts quartz powder; The interface repair agent is a water-based interface treatment agent made of a penetrating crystalline material; the penetrating crystalline material is a common cement-based penetrating crystalline material. The ultrafine fly ash cenospheres are Class I, with a calcination vector of no more than 2% and a specific surface area greater than 600 cm³. 2 / g.

2. The rapid repair material for high-speed railway tunnel defects according to claim 1, characterized in that: The rapid repair material for high-speed railway tunnel defects comprises the following components by weight: 220-240 parts cement, 130-140 parts ultrafine fly ash cenospheres, 40-50 parts crack-resistant agent, 40-50 parts interface repair agent, 40-50 parts rheology modifier, 870-900 parts coarse aggregate, 870-900 parts fine aggregate, and 4-5 parts water-reducing agent. The crack-resistant agent, by weight, comprises the following components: 45-50 parts MgO, 45-55 parts CaO, 10-14 parts Al2O3, and 1-3 parts quartz powder.

3. The rapid repair material for high-speed railway tunnel defects according to claim 1 or 2, characterized in that: The rheology-modifying material is silica fume.

4. The rapid repair material for high-speed railway tunnel defects according to claim 1 or 2, characterized in that: The fine aggregate is medium sand from the Yellow River, with a fineness modulus of 3-2.3, a particle size of 0.5-0.35 mm, and an average particle size of 0.4 mm.

5. The rapid repair material for high-speed railway tunnel defects according to claim 1 or 2, characterized in that: The coarse aggregate is basalt crushed stone with a particle size of 5-15 mm and an average particle size of 11 mm.

6. The rapid repair material for high-speed railway tunnel defects according to claim 1 or 2, characterized in that: The water-reducing agent is a polycarboxylate-based high-performance water-reducing agent.

7. The rapid repair material for high-speed railway tunnel defects according to claim 1 or 2, characterized in that: The rapid repair material for high-speed railway tunnel defects also includes 150-200 parts of water.

8. The preparation method of the rapid repair material for high-speed railway tunnel defects as described in claim 1 or 2, characterized in that: Includes the following steps: Cement, crack-resistant agent, interface repair agent, ultrafine fly ash cenospheres, rheology modifier, coarse aggregate and fine aggregate are mixed evenly in proportion to obtain a mixture; Add water-reducing agent and some water to the mixture, mix well, and a viscous slurry is obtained; Mix the viscous slurry with the remaining water until homogeneous to obtain the repair material.

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