A high-performance concrete material for expansion joint anchorage areas and its preparation method

Abstract

The present invention relates to the technical field of concrete, and specifically discloses a high-performance concrete material for a telescopic joint anchorage area, which comprises the following raw materials in parts by weight: 45-50 parts of portland cement, 15-20 parts of fine aggregate, 20-25 parts of coarse aggregate, 10-15 parts of a modified lignin blended flaky boron nitride agent, 3-5 parts of sodium carboxymethyl cellulose, 2-4 parts of a water reducing agent, and 40-50 parts of water. The high-performance concrete material of the present invention uses portland cement in combination with fine aggregate and coarse aggregate, and is optimized through the preparation of sodium carboxymethyl cellulose and a water reducing agent. At the same time, the added modified lignin blended flaky boron nitride agent is dispersed into the matrix to improve the anti-seepage, anti-cracking and strength properties of the matrix, and optimize the coordination effect between the two. At the same time, the glass fiber regulator and modified silicon nitride added to the product coordinate and synergistically enhance the anti-seepage, anti-cracking and strength coordination effect of the product, and optimize the stability of the product under acid corrosion and high temperature conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of metal substrate coatings, and particularly relates to a high-performance concrete material for expansion joint anchorage areas and a preparation method thereof. Background Art

[0002] A bridge expansion joint refers to an expansion joint usually arranged between two beam ends, between a beam end and an abutment, or at the hinged position of a bridge to meet the requirements of bridge deck deformation; the bridge expansion joint is arranged at a weak part of the two ends of the structure and is often exposed to nature for a long time, and the environment is relatively harsh; with the increase in traffic volume and the increase in vehicle load, it directly bears the repeated impact of wheel loads, and wear and fatigue of materials often occur. Therefore, the concrete used in the expansion joint anchorage area has high performance requirements. The existing concrete generally has general strength performance, poor anti-seepage and anti-cracking performance, and it is difficult to coordinately improve the strength performance, anti-seepage and anti-cracking performance, and the stability performance is poor under acid corrosion and high temperature conditions, further restricting the application efficiency of the product. Summary of the Invention

[0003] Aiming at the defects of the prior art, the purpose of the present invention is to provide a high-performance concrete material for expansion joint anchorage areas and a preparation method thereof to solve the problems raised in the above background art.

[0004] The present invention adopts the following technical solutions to solve the technical problems:

[0005] The present invention provides a high-performance concrete material for expansion joint anchorage areas, comprising the following raw materials in parts by weight:

[0006] 45 - 50 parts of portland cement, 15 - 20 parts of fine aggregate, 20 - 25 parts of coarse aggregate, 10 - 15 parts of modified lignin blended flaky boron nitride agent, 3 - 5 parts of sodium carboxymethylcellulose, 2 - 4 parts of water reducing agent, 40 - 50 parts of water;

[0007] The preparation method of the modified lignin blended flaky boron nitride agent is as follows:

[0008] S01: Add 6 - 8 parts of flaky boron nitride and 2 - 5 parts of hydrogen peroxide into 10 - 15 parts of ethanol solvent, stir evenly, wash with water and dry to obtain the first flaky boron nitride;

[0009] S02: Feed 4 - 6 parts of the first flaky boron nitride, 1 - 2 parts of ammonium bicarbonate and 0.25 - 0.35 parts of cobalt nitrate solution into 10 - 12 parts of acetone solvent, continue to stir evenly, and finally wash with water and dry to obtain the second flaky boron nitride;

[0010] S03: Esterify 3 - 5 parts of lignin with 10 - 15 parts of 20% gluconic acid solution by mass fraction at an esterification reaction temperature of 150°C for 24 hours to obtain a lignin blending agent;

[0011] S04: Add 3 to 5 parts of the second flaky boron nitride and 2 to 3 parts of the lignin blending agent into 20 to 30 parts of deionized water, stir evenly, then add 2 to 6 parts of organic alcohol amine and 1 to 2 parts of barium nitrate aqueous solution, stir for reaction, and after stirring, wash with water and dry to obtain a modified lignin blending flaky boron nitride agent.

[0012] Preferably, the high performance concrete material for the expansion joint anchoring zone comprises the following raw materials in parts by weight:

[0013] 47.5 parts of Portland cement, 17.5 parts of fine aggregate, 22.5 parts of coarse aggregate, 12.5 parts of modified lignin blended flaky boron nitride agent, 4 parts of sodium carboxymethyl cellulose, 3 parts of water reducer, and 45 parts of water.

[0014] Preferably, the fine aggregate is river sand with a fineness modulus of 2.6; the coarse aggregate is granite with a particle size of 10 mm; and the water reducer is a polycarboxylate water reducer.

[0015] Preferably, the S04 stirring temperature is 45-48°C, the stirring time is 1-2h, and the stirring speed is 350-400r / min.

[0016] Preferably, the mass fraction of the SO2 cobalt nitrate solution is 3-5%; the mass fraction of the SO4 barium nitrate aqueous solution is 6-10%.

[0017] Preferably, the high performance concrete material further comprises 6 to 10 parts by weight of a glass fiber regulator and 3 to 5 parts by weight of modified silicon nitride;

[0018] The preparation method of the glass fiber conditioning agent is:

[0019] Add 10 to 20 parts of glass fiber to 35 to 40 parts of ethanol solvent, then add 2 to 5 parts of tetraethoxysilane and 1 to 3 parts of hydroxyacetic acid, stir evenly, then add 3 to 6 parts of yttrium / lanthanum composite liquid and 1 to 2 parts of active α-alumina, continue to stir sufficiently, finally wash with water and dry to obtain a glass fiber regulator.

[0020] Preferably, the yttrium / lanthanum composite liquid is a 5% by mass yttrium nitrate solution added to a 10% by mass sodium silicate aqueous solution which is 3 times the total amount of the yttrium nitrate solution, and then a 6% by mass lanthanum nitrate solution is added to the yttrium nitrate solution, and stirred thoroughly to obtain the yttrium / lanthanum composite liquid.

[0021] Preferably, the preparation method of the modified silicon nitride is:

[0022] S101: heat-treating silicon nitride at 310-320° C. for 10-20 min, then cooling to 55-65° C. at a rate of 2-5° C. / min, keeping warm, and setting aside;

[0023] S102: Add magnesium oxide to deionized water in a weight ratio of 1:5 and disperse it evenly. Then add 2 - 5% of sodium carboxymethylcellulose and 1 - 3% of silane coupling agent KH560 based on the total amount of magnesium oxide, stir evenly, wash with water and dry to obtain a magnesium oxide pre - conditioner.

[0024] S103: Add 2 - 5 parts of silica sol, 1 - 3 parts of sodium dodecyl sulfate and 0.35 - 0.45 parts of sodium citrate to 10 - 15 parts of a 5% chitosan solution by mass, stir evenly to obtain a silicon nitride treatment agent.

[0025] S104: Mix the product of S101, the silicon nitride treatment agent and the magnesium oxide pre - conditioner in a weight ratio of 8:3:1, feed it into a ball mill for ball milling. The ball - milling speed is 750 - 850 r / min and the ball - milling time is 1 - 2 h. After ball - milling, wash with water and dry to obtain modified silicon nitride.

[0026] Preferably, the mass fraction of the chitosan solution is 5 - 8%.

[0027] The present invention also provides a preparation method of a high - performance concrete material for the expansion joint anchorage area, which is characterized by including the following steps:

[0028] Step 1: Add portland cement, fine aggregate and coarse aggregate into a mixer, stir at a speed of 500 - 700 r / min for 15 - 20 min, then add sodium carboxymethylcellulose and a modified lignin - based boron nitride agent for flake - like, and continue to stir for 5 min to make a pre - mixture.

[0029] Step 2: Add a glass fiber conditioner and modified silicon nitride into water, disperse at a speed of 300 - 350 r / min for 20 - 30 min to obtain a conditioner body.

[0030] Step 3: Stir - mix the pre - mixture, the conditioner body and a water - reducing agent at a stirring speed of 1000 - 1200 r / min for 45 - 55 min. After stirring, obtain the high - performance concrete material of the present invention.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The high - performance concrete material of the present invention uses portland cement in combination with fine aggregate and coarse aggregate, which is optimized through sodium carboxymethylcellulose and a water - reducing agent. At the same time, the added modified lignin - based boron nitride agent for flake - like is dispersed into the matrix to improve the anti - seepage, anti - cracking and strength properties of the matrix, optimize the coordination effect of the two. At the same time, the glass fiber conditioner and modified silicon nitride added to the product coordinate and synergistically enhance the anti - seepage, anti - cracking and strength coordination effect of the product, and optimize the stability of the product under acid corrosion and high - temperature conditions.

[0033] 2. The modified lignin blended flaky boron nitride agent: The flaky boron nitride is treated with hydrogen peroxide and ethanol solvent to obtain the first flaky boron nitride. The first flaky boron nitride is further treated with ammonium bicarbonate and cobalt nitrate solution to obtain the second flaky boron nitride. The optimized second flaky boron nitride has high activity and strong dispersibility, which is convenient for blending with the lignin conditioner. Through the lignin conditioner, it can be better dispersed in the cement matrix and combined with the raw materials, improving the bonding degree. Through the combination of organic alkanolamine and barium nitrate aqueous solution, the raw materials are blended and modified with each other. Thus, the optimized modified lignin blended flaky boron nitride agent can provide excellent anti-seepage, anti-cracking and strength properties for the matrix;

[0034] 3. The glass fiber conditioner: The glass fiber is dispersed with ethanol solvent, and tetraethoxysilane, glycolic acid, yttrium / lanthanum composite solution and activated α-aluminum oxide are added and blended and modified. The interface property of the system is optimized by the yttrium / lanthanum composite solution and tetraethoxysilane. The yttrium / lanthanum composite solution is prepared by combining yttrium nitrate solution, sodium silicate aqueous solution and lanthanum nitrate solution, which improves the activity efficiency of the system and the stability of the efficiency. Thus, the coordinated hybridization between the activated α-aluminum oxide and the glass fiber is improved and filled into the system to strengthen the system performance. Thus, it works synergistically with the modified lignin blended flaky boron nitride agent, and the anti-seepage, anti-cracking and strength properties of the product are further improved, and the acid corrosion resistance and stability of the product under high temperature conditions are more significantly improved;

[0035] 4. The modified silicon nitride: The silicon nitride is heat-treated to improve its activity. Magnesium oxide is adjusted with sodium carboxymethyl cellulose and silane coupling agent KH560 to improve its dispersibility and interfacial effect, which is convenient for coordinating with the silicon nitride treatment agent to jointly optimize the heat-treated silicon nitride. The modified silicon nitride can cooperate with the glass fiber conditioner and the modified lignin blended flaky boron nitride agent. As an intermediate coordination body, it jointly coordinates the connectivity effect between the glass fiber conditioner and the modified lignin blended flaky boron nitride agent, optimizes the acid corrosion resistance and temperature stability of the system, and improves the coordination of the anti-seepage, anti-cracking and strength properties of the product. Specific embodiments

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] A high-performance concrete material for the expansion joint anchorage area in this embodiment includes the following raw materials in parts by weight:

[0038] 45 - 50 parts of portland cement, 15 - 20 parts of fine aggregate, 20 - 25 parts of coarse aggregate, 10 - 15 parts of modified lignin - blended flaky boron nitride agent, 3 - 5 parts of sodium carboxymethylcellulose, 2 - 4 parts of water - reducing agent, 40 - 50 parts of water;

[0039] The preparation method of the modified lignin - blended flaky boron nitride agent is as follows:

[0040] S01: Add 6 - 8 parts of flaky boron nitride and 2 - 5 parts of hydrogen peroxide into 10 - 15 parts of ethanol solvent, stir evenly, wash with water and dry to obtain the first flaky boron nitride;

[0041] S02: Feed 4 - 6 parts of the first flaky boron nitride, 1 - 2 parts of ammonium bicarbonate and 0.25 - 0.35 parts of cobalt nitrate solution into 10 - 12 parts of acetone solvent, continue to stir evenly, and finally wash with water and dry to obtain the second flaky boron nitride;

[0042] S03: Esterify 3 - 5 parts of lignin and 10 - 15 parts of 20% gluconic acid solution by mass fraction at an esterification reaction temperature of 150 °C for 24 h to obtain a lignin - blended agent;

[0043] S04: Add 3 - 5 parts of the second flaky boron nitride and 2 - 3 parts of the lignin - blended agent into 20 - 30 parts of deionized water, stir evenly first, then add 2 - 6 parts of organic alkanolamine and 1 - 2 parts of barium nitrate aqueous solution, stir and react, and after stirring ends, wash with water and dry to obtain the modified lignin - blended flaky boron nitride agent.

[0044] The high - performance concrete material for the expansion joint anchorage area in this embodiment includes the following raw materials in parts by weight:

[0045] 47.5 parts of portland cement, 17.5 parts of fine aggregate, 22.5 parts of coarse aggregate, 12.5 parts of modified lignin - blended flaky boron nitride agent, 4 parts of sodium carboxymethylcellulose, 3 parts of water - reducing agent, 45 parts of water.

[0046] The fine aggregate in this embodiment is river sand with a fineness modulus of 2.6; the coarse aggregate is granite with a particle size of 10 mm; the water - reducing agent is a polycarboxylate water - reducing agent.

[0047] The stirring temperature of S04 in this embodiment is 45 - 48 °C, the stirring time is 1 - 2 h, and the stirring speed is 350 - 400 r / min.

[0048] The mass fraction of the cobalt nitrate solution in S02 of this embodiment is 3 - 5%; the mass fraction of the barium nitrate aqueous solution in S04 is 6 - 10%.

[0049] The high - performance concrete material in this embodiment further includes 6 - 10 parts by weight of glass fiber regulator and 3 - 5 parts by weight of modified silicon nitride;

[0050] The preparation method of the glass fiber regulator is as follows:

[0051] Add 10 - 20 parts of glass fiber into 35 - 40 parts of ethanol solvent, then add 2 - 5 parts of tetraethoxysilane and 1 - 3 parts of glycolic acid. First, stir evenly, then add 3 - 6 parts of yttrium / lanthanum composite solution and 1 - 2 parts of activated α-aluminum oxide, continue to stir thoroughly, and finally wash with water and dry to obtain the glass fiber regulator.

[0052] The yttrium / lanthanum composite solution in this example is prepared by adding a 5% yttrium nitrate solution by mass to an aqueous sodium silicate solution with a mass fraction of 10% which is 3 times the total amount of the yttrium nitrate solution, and then adding a 6% lanthanum nitrate solution based on the total amount of the yttrium nitrate solution, and stirring thoroughly to obtain the yttrium / lanthanum composite solution.

[0053] The preparation method of the modified silicon nitride in this example is as follows:

[0054] S101: Heat-treat silicon nitride at 310 - 320 °C for 10 - 20 min, then cool it at a rate of 2 - 5 °C / min to 55 - 65 °C, and keep it warm for standby;

[0055] S102: Add magnesium oxide to deionized water in a weight ratio of 1:5 and disperse it evenly, then add 2 - 5% of sodium carboxymethylcellulose and 1 - 3% of silane coupling agent KH560 based on the total amount of magnesium oxide, stir evenly, wash with water and dry to obtain the magnesium oxide pre-conditioner;

[0056] S103: Add 2 - 5 parts of silica sol, 1 - 3 parts of sodium dodecyl sulfate and 0.35 - 0.45 parts of sodium citrate to 10 - 15 parts of a 5% chitosan solution by mass, and stir evenly to obtain the silicon nitride treatment agent;

[0057] S104: Mix the product of S101, the silicon nitride treatment agent and the magnesium oxide pre-conditioner in a weight ratio of 8:3:1, feed them into a ball mill for ball milling, the ball milling speed is 750 - 850 r / min, the ball milling time is 1 - 2 h, after the ball milling is completed, wash with water and dry to obtain the modified silicon nitride.

[0058] The mass fraction of the chitosan solution in this example is 5 - 8%.

[0059] The preparation method of a high-performance concrete material for the expansion joint anchorage area in this example is characterized by including the following steps:

[0060] Step 1: Add portland cement, fine aggregate, and coarse aggregate into a mixer, stir at a speed of 500 - 700 r / min for 15 - 20 min, then add sodium carboxymethylcellulose and a modified lignin-based boron nitride agent for flake shape, and continue to stir for 5 min to make a pre-mixture;

[0061] Step 2: Add the glass fiber regulator and modified silicon nitride into water, and disperse them at a speed of 300 - 350 r / min for 20 - 30 min to obtain a regulator body;

[0062] Step 3: Stir and mix the premix, the regulator body and the water reducer at a stirring speed of 1000 - 1200 r / min for 45 - 55 min. After the stirring ends, the high-performance concrete material of the present invention is obtained.

[0063] Example 1.

[0064] A high-performance concrete material for a telescopic joint anchorage area in this example includes the following raw materials in parts by weight:

[0065] 45 parts of portland cement, 15 parts of fine aggregate, 20 parts of coarse aggregate, 10 parts of modified lignin and flaky boron nitride agent, 3 parts of sodium carboxymethyl cellulose, 2 parts of water reducer, 40 parts of water;

[0066] The preparation method of the modified lignin and flaky boron nitride agent is as follows:

[0067] S01: Add 6 parts of flaky boron nitride and 2 parts of hydrogen peroxide into 10 parts of ethanol solvent, stir evenly, wash with water and dry to obtain the first flaky boron nitride;

[0068] S02: Feed 4 parts of the first flaky boron nitride, 1 part of ammonium bicarbonate and 0.25 part of cobalt nitrate solution into 10 parts of acetone solvent, continue to stir evenly, and finally wash with water and dry to obtain the second flaky boron nitride;

[0069] S03: Esterify 3 parts of lignin and 10 parts of 20% gluconic acid solution by mass at an esterification reaction temperature of 150 °C for 24 h to obtain a lignin conditioner;

[0070] S04: Add 3 parts of the second flaky boron nitride and 2 parts of the lignin conditioner into 20 parts of deionized water, first stir evenly, then add 2 parts of organic alkanolamine and 1 part of barium nitrate aqueous solution, stir and react, and after the stirring ends, wash with water and dry to obtain the modified lignin and flaky boron nitride agent.

[0071] The fine aggregate in this example is river sand with a fineness modulus of 2.6; the coarse aggregate is granite with a particle size of 10 mm; the water reducer is a polycarboxylate water reducer.

[0072] The stirring temperature in S04 of this example is 45 °C, the stirring time is 1 h, and the stirring speed is 350 r / min.

[0073] The mass fraction of the cobalt nitrate solution in S02 of this example is 3%; the mass fraction of the barium nitrate aqueous solution in S04 is 6%.

[0074] The high-performance concrete material of this embodiment further includes 6 parts by weight of glass fiber regulator and 3 parts by weight of modified silicon nitride;

[0075] The preparation method of the glass fiber regulator is as follows:

[0076] Add 10 parts of glass fiber into 35 parts of ethanol solvent, then add 2 parts of tetraethoxysilane and 1 part of glycolic acid, stir evenly first, then add 3 parts of yttrium / lanthanum composite solution and 1 part of active α-aluminum oxide, continue to stir thoroughly, and finally wash with water and dry to obtain the glass fiber regulator.

[0077] The yttrium / lanthanum composite solution of this embodiment is prepared by adding a 5% by mass yttrium nitrate solution to a 10% by mass sodium silicate aqueous solution 3 times the total amount of the yttrium nitrate solution, and then adding a 6% by mass lanthanum nitrate solution to the total amount of the yttrium nitrate solution, and stirring thoroughly to obtain the yttrium / lanthanum composite solution.

[0078] The preparation method of the modified silicon nitride of this embodiment is as follows:

[0079] S101: Heat-treat silicon nitride at 310 °C for 10 min first, then cool it to 55 °C at a rate of 2 °C / min, keep it warm, and set aside;

[0080] S102: Add magnesium oxide to deionized water according to a weight ratio of 1:5 and disperse it evenly, then add 2% of sodium carboxymethylcellulose and 1% of silane coupling agent KH560 based on the total amount of magnesium oxide, stir evenly, wash with water and dry to obtain the magnesium oxide pre-conditioner;

[0081] S103: Add 2 parts of silica sol, 1 part of sodium dodecyl sulfate and 0.35 part of sodium citrate to 10 parts of a 5% by mass chitosan solution, stir evenly to obtain the silicon nitride treatment agent;

[0082] S104: Mix the product of S101, the silicon nitride treatment agent and the magnesium oxide pre-conditioner according to a weight ratio of 8:3:1, send them into a ball mill for ball milling, the ball milling speed is 750 r / min, the ball milling time is 1 h, after the ball milling is finished, wash with water and dry to obtain the modified silicon nitride.

[0083] The mass fraction of the chitosan solution of this embodiment is 5%.

[0084] A preparation method of a high-performance concrete material for a telescopic joint anchorage area according to this embodiment is characterized by including the following steps:

[0085] Step 1: Add portland cement, fine aggregate and coarse aggregate into a mixer, stir at a speed of 500 r / min for 15 min, then add sodium carboxymethylcellulose and modified lignin to reconcile the flaky boron nitride agent, and continue to stir for 5 min to make a premix;

[0086] Step 2: Add the glass fiber regulator and modified silicon nitride into water, and disperse them at a speed of 300 r / min for 20 min to obtain the regulator body.

[0087] Step 3: Stir and mix the premix, the regulator body and the water reducer. The stirring speed is 1000 r / min and the stirring time is 45 min. After the stirring ends, the high-performance concrete material of the present invention is obtained.

[0088] Example 2.

[0089] A high-performance concrete material for the expansion joint anchorage area in this example includes the following raw materials in parts by weight:

[0090] 50 parts of portland cement, 20 parts of fine aggregate, 25 parts of coarse aggregate, 15 parts of modified lignin and flaky boron nitride agent, 5 parts of sodium carboxymethylcellulose, 4 parts of water reducer, 50 parts of water;

[0091] The preparation method of the modified lignin and flaky boron nitride agent is as follows:

[0092] S01: Add 8 parts of flaky boron nitride and 5 parts of hydrogen peroxide into 15 parts of ethanol solvent, stir evenly, wash with water and dry to obtain the first flaky boron nitride.

[0093] S02: Feed 6 parts of the first flaky boron nitride, 2 parts of ammonium bicarbonate and 0.35 parts of cobalt nitrate solution into 12 parts of acetone solvent, continue to stir evenly, and finally wash with water and dry to obtain the second flaky boron nitride.

[0094] S03: Esterify 5 parts of lignin and 15 parts of 20% mass fraction gluconic acid solution. The esterification reaction temperature is 150 °C and the esterification time is 24 h to obtain the lignin conditioner.

[0095] S04: Add 5 parts of the second flaky boron nitride and 3 parts of the lignin conditioner into 30 parts of deionized water, stir evenly first, then add 6 parts of organic alkanolamine and 2 parts of barium nitrate aqueous solution, stir and react, and after the stirring ends, wash with water and dry to obtain the modified lignin and flaky boron nitride agent.

[0096] The fine aggregate in this example is river sand with a fineness modulus of 2.6; the coarse aggregate is granite with a particle size of 10 mm; the water reducer is a polycarboxylate water reducer.

[0097] The stirring temperature of S04 in this example is 48 °C, the stirring time is 2 h, and the stirring speed is 400 r / min.

[0098] The mass fraction of the cobalt nitrate solution in S02 of this example is 5%; the mass fraction of the barium nitrate aqueous solution in S04 is 10%.

[0099] The high-performance concrete material of this embodiment further includes 10 parts by weight of glass fiber regulator and 5 parts by weight of modified silicon nitride;

[0100] The preparation method of the glass fiber regulator is as follows:

[0101] Add 20 parts of glass fiber into 40 parts of ethanol solvent, then add 5 parts of tetraethoxysilane and 3 parts of glycolic acid, stir evenly first, then add 6 parts of yttrium / lanthanum composite solution and 2 parts of activated α-aluminum oxide, continue to stir thoroughly, and finally wash with water and dry to obtain the glass fiber regulator.

[0102] The yttrium / lanthanum composite solution of this embodiment is a 5% by mass yttrium nitrate solution added to a 10% by mass sodium silicate aqueous solution three times the total amount of the yttrium nitrate solution, and then a 6% by mass lanthanum nitrate solution based on the total amount of the yttrium nitrate solution is added, and stirred thoroughly to obtain the yttrium / lanthanum composite solution.

[0103] The preparation method of the modified silicon nitride of this embodiment is as follows:

[0104] S101: Heat-treat silicon nitride at 320 °C for 20 min first, then cool it to 65 °C at a rate of 5 °C / min, keep it warm and set aside;

[0105] S102: Add magnesium oxide to deionized water according to a weight ratio of 1:5 and disperse it evenly, then add 5% of sodium carboxymethylcellulose and 3% of silane coupling agent KH560 based on the total amount of magnesium oxide, stir evenly, wash with water and dry to obtain the magnesium oxide pre-conditioner;

[0106] S103: Add 5 parts of silica sol, 3 parts of sodium dodecyl sulfate and 0.45 parts of sodium citrate to 15 parts of an 8% by mass chitosan solution, stir evenly to obtain the silicon nitride treatment agent;

[0107] S104: Mix the product of S101, the silicon nitride treatment agent and the magnesium oxide pre-conditioner according to a weight ratio of 8:3:1, send them into a ball mill for ball milling, the ball milling speed is 850 r / min, the ball milling time is 2 h, after the ball milling is finished, wash with water and dry to obtain the modified silicon nitride.

[0108] The mass fraction of the chitosan solution of this embodiment is 8%.

[0109] The preparation method of a high-performance concrete material for the expansion joint anchorage area of this embodiment is characterized by including the following steps:

[0110] Step 1: Add portland cement, fine aggregate and coarse aggregate into a mixer, stir at a speed of 700 r / min for 20 min, then add sodium carboxymethylcellulose and modified lignin to reconcile the flaky boron nitride agent, and continue to stir for 5 min to make a premixed body;

[0111] Step 2: Add the glass fiber regulator and modified silicon nitride into water, disperse at a speed of 350 r / min for 30 min to obtain the regulator body;

[0112] Step 3: Stir and mix the premix, the regulator body and the water reducing agent at a stirring speed of 1200 r / min for 55 min. After the stirring is completed, the high-performance concrete material of the present invention is obtained.

[0113] Example 3.

[0114] A high-performance concrete material for the expansion joint anchorage area in this example includes the following raw materials in parts by weight:

[0115] 47.5 parts of portland cement, 17.5 parts of fine aggregate, 22.5 parts of coarse aggregate, 12.5 parts of modified lignin blended flaky boron nitride agent, 4 parts of sodium carboxymethylcellulose, 3 parts of water reducing agent, 45 parts of water;

[0116] The preparation method of the modified lignin blended flaky boron nitride agent is as follows:

[0117] S01: Add 7 parts of flaky boron nitride and 3.5 parts of hydrogen peroxide into 12.5 parts of ethanol solvent, stir evenly, wash with water and dry to obtain the first flaky boron nitride;

[0118] S02: Feed 5 parts of the first flaky boron nitride, 1.5 parts of ammonium bicarbonate and 0.30 part of cobalt nitrate solution into 11 parts of acetone solvent, continue to stir evenly, and finally wash with water and dry to obtain the second flaky boron nitride;

[0119] S03: Esterify 4 parts of lignin and 12.5 parts of 20% glucose acid solution by mass. The esterification reaction temperature is 150 °C and the esterification time is 24 h to obtain the lignin blending agent;

[0120] S04: Add 4 parts of the second flaky boron nitride and 2.5 parts of the lignin blending agent into 25 parts of deionized water, stir evenly first, then add 4 parts of organic alkanolamine and 1.5 parts of barium nitrate aqueous solution, stir and react, and after the stirring is completed, wash with water and dry to obtain the modified lignin blended flaky boron nitride agent.

[0121] The fine aggregate in this example is river sand with a fineness modulus of 2.6; the coarse aggregate is granite with a particle size of 10 mm; the water reducing agent is a polycarboxylate water reducing agent.

[0122] The stirring temperature of S04 in this example is 46 °C, the stirring time is 1.5 h, and the stirring speed is 370 r / min.

[0123] The mass fraction of the cobalt nitrate solution in S02 of this example is 4%; the mass fraction of the barium nitrate aqueous solution in S04 is 8%.

[0124] The high-performance concrete material of this embodiment further includes 8 parts by weight of glass fiber regulator and 4 parts by weight of modified silicon nitride;

[0125] The preparation method of the glass fiber regulator is as follows:

[0126] Add 15 parts of glass fiber into 37 parts of ethanol solvent, then add 3.5 parts of tetraethoxysilane and 2 parts of glycolic acid, stir evenly first, then add 4.5 parts of yttrium / lanthanum composite solution and 1.5 parts of active α-aluminum oxide, continue to stir thoroughly, and finally wash with water and dry to obtain the glass fiber regulator.

[0127] The yttrium / lanthanum composite solution of this embodiment is prepared by adding a 5% by mass yttrium nitrate solution to a 10% by mass sodium silicate aqueous solution that is 3 times the total amount of the yttrium nitrate solution, and then adding a 6% by mass lanthanum nitrate solution to the total amount of the yttrium nitrate solution, and stirring thoroughly to obtain the yttrium / lanthanum composite solution.

[0128] The preparation method of the modified silicon nitride of this embodiment is as follows:

[0129] S101: Heat-treat silicon nitride at 315 °C for 15 min first, then cool it to 60 °C at a rate of 3.5 °C / min, and keep it warm for later use;

[0130] S102: Add magnesium oxide to deionized water according to a weight ratio of 1:5 and disperse it evenly, then add 3.5% of sodium carboxymethylcellulose and 2% of silane coupling agent KH560 based on the total amount of magnesium oxide, stir evenly, wash with water and dry to obtain the magnesium oxide pre-conditioner;

[0131] S103: Add 3.5 parts of silica sol, 2 parts of sodium dodecyl sulfate and 0.40 part of sodium citrate to 12.5 parts of a 6.5% by mass chitosan solution, and stir evenly to obtain the silicon nitride treatment agent;

[0132] S104: Mix the product of S101, the silicon nitride treatment agent and the magnesium oxide pre-conditioner according to a weight ratio of 8:3:1, send them into a ball mill for ball milling, the ball milling speed is 800 r / min, the ball milling time is 1.5 h, after the ball milling is completed, wash with water and dry to obtain the modified silicon nitride.

[0133] The mass fraction of the chitosan solution of this embodiment is 6.5%.

[0134] A preparation method of a high-performance concrete material for a telescopic joint anchorage area according to this embodiment is characterized by including the following steps:

[0135] Step 1: Add Portland cement, fine aggregate, and coarse aggregate into a mixer, stir at a speed of 600 r / min for 17.5 min, then add sodium carboxymethyl cellulose and modified lignin blended flaky boron nitride agent, and continue to stir for 5 min to prepare a premixed body;

[0136] Step 2: Add glass fiber regulator and modified silicon nitride into water, disperse at a speed of 325 r / min for 25 min to obtain a regulator body;

[0137] Step 3: Stir and mix the premixed body, regulator body, and water reducer, with a stirring speed of 1100 r / min and stir for 50 min. After the stirring is completed, the high-performance concrete material of the present invention is obtained.

[0138] Comparative Example 1.

[0139] It is different from Example 3 in that the modified lignin blended flaky boron nitride agent is not added.

[0140] Comparative Example 2.

[0141] It is different from Example 3 in that the lignin conditioner is not added in the preparation of the modified lignin blended flaky boron nitride agent.

[0142] Comparative Example 3.

[0143] It is different from Example 3 in that in the preparation of the modified lignin blended flaky boron nitride agent, the first flaky boron nitride is directly replaced with a flaky boron nitride raw material. S02: 5 parts of flaky boron nitride, 1.5 parts of ammonium bicarbonate, and 0.30 parts of cobalt nitrate solution are fed into 11 parts of acetone solvent, and continue to stir evenly. Finally, wash with water and dry to obtain the second flaky boron nitride.

[0144] Comparative Example 4.

[0145] It is different from Example 3 in that in the preparation of the modified lignin blended flaky boron nitride agent, the second flaky boron nitride in S04 is replaced with the first flaky boron nitride.

[0146] Comparative Example 5.

[0147] It is different from Example 3 in that in the preparation of the modified lignin blended flaky boron nitride agent, organic alkanolamine and barium nitrate aqueous solution are not added.

[0148] Comparative Example 6.

[0149] It is different from Example 3 in that the glass fiber regulator is not added.

[0150] Comparative Example 7.

[0151] It is different from Example 3 in that the yttrium / lanthanum composite solution is not added in the preparation of the glass fiber regulator.

[0152] Comparative Example 8.

[0153] It is different from Example 3 in that active α-aluminum oxide is not added in the preparation of the glass fiber regulator.

[0154] Comparative Example 9.

[0155] It is different from Example 3 in that modified silicon nitride is not added.

[0156] Comparative Example 10.

[0157] It is different from Example 3 in that magnesium oxide preconditioner is not added in the preparation of modified silicon nitride.

[0158] Comparative Example 11.

[0159] It is different from Example 3 in that silicon nitride treatment agent is not added in the preparation of modified silicon nitride.

[0160] Comparative Example 12.

[0161] It is different from Example 3 in that the preparation method of the silicon nitride treatment agent in the preparation of modified silicon nitride is different:

[0162] 3.5 parts of silica sol and 0.40 part of sodium citrate are added to 12.5 parts of deionized water and stirred evenly to obtain the silicon nitride treatment agent.

[0163] Comparative Example 13.

[0164] It is different from Example 3 in that the silicon nitride of S101 is not subjected to any heat treatment and directly used to replace the combined treatment in Step S104.

[0165] The products of Examples 1 to 3 and Comparative Examples 1 to 13 were tested for strength, anti-seepage and anti-cracking performance; the water penetration resistance test was carried out in accordance with the standard of GB / T50082-2009 to test the maximum anti-seepage water pressure; at the same time, the ultimate tensile strength was tested; and the cracking time and crack length of the concrete specimen were tested under a compressive strength of 55 MPa.

[0166]

[0167]

[0168] It can be seen from Comparative Examples 1-9 and Examples 1-3;

[0169] The product of Example 3 has excellent maximum anti-seepage water pressure, and at the same time has excellent ultimate tensile strength and anti-cracking performance, and the performance can be coordinately improved;

[0170] It can be seen from Comparative Examples 1-5 and Example 3 that when the modified lignin blended flaky boron nitride agent is not added in the present invention, the performance of the product deteriorates significantly. At the same time, when the lignin blending agent is not added during the preparation of the modified lignin blended flaky boron nitride agent, the first flaky boron nitride in the preparation of the modified lignin blended flaky boron nitride agent is directly replaced with the flaky boron nitride raw material, the second flaky boron nitride in S04 in the preparation of the modified lignin blended flaky boron nitride agent is replaced with the first flaky boron nitride, the organic alkanolamine and barium nitrate aqueous solution are not added during the preparation of the modified lignin blended flaky boron nitride agent; the performance of the product all shows a deteriorating trend. Only when the modified lignin blended flaky boron nitride agent prepared by the method of the present invention is used, the performance effect of the product is the most significant;

[0171] It can be seen from Comparative Example 1, Comparative Example 6 and Comparative Example 9 that when the modified silicon nitride, the glass fiber regulator and the modified lignin blended flaky boron nitride agent are not added, the performance of the product all shows an obvious deteriorating trend. Only when the three are blended to achieve synergistic effect, the performance effect of the product is the most significant;

[0172] It can be seen from Comparative Examples 6-13 and Example 3 that

[0173] When the magnesium oxide pre-adjusting agent is not added during the preparation of the modified silicon nitride, the silicon nitride treating agent is not added, the preparation method of the silicon nitride treating agent is different during the preparation of the modified silicon nitride, and the silicon nitride in S101 of the modified silicon nitride is not subjected to any heat treatment during the preparation, the performance of the product all shows a deteriorating trend. At the same time, for the glass fiber regulators prepared by different methods, the performance of the product also shows a deteriorating trend. Only when the modified silicon nitride and the glass fiber regulator prepared by the method of the present invention are used, the performance effect of the product is the most significant.

[0174] After the product is placed under 2% hydrochloric acid corrosion for 2 h and then placed at 65 °C for 5 h, the acid corrosion resistance and temperature stability are tested, and the test results are as follows;

[0175]

[0176]

[0177] It can be seen from Comparative Examples 1-13 and Example 3 that the product of Example 3 has excellent performance stability under acid corrosion and temperature resistance conditions. When one of modified silicon nitride, glass fiber regulator, and modified lignin blended flaky boron nitride agent is not added to the product, the performance stability of the product deteriorates significantly. At the same time, the inventors of the present invention found that when modified silicon nitride is not added, the product performance deteriorates more significantly. The addition of modified silicon nitride has an obvious improvement effect on the acid corrosion resistance and temperature resistance stability of the product. At the same time, only the modified silicon nitride prepared by using the magnesium oxide pre-conditioner, silicon nitride treatment agent of the present invention, and the specific process of the present invention, and the silicon nitride in S101 of the preparation of modified silicon nitride is heat-treated. Only the modified silicon nitride prepared by using the specific process of the present invention has the most obvious performance effect, and the effect of using other methods to replace it is not as significant as that of the present invention.

[0178] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0179] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-performance concrete material for the anchorage area of expansion joints, characterized in that, It includes the following raw materials in parts by weight: 45-50 parts of Portland cement, 15-20 parts of fine aggregate, 20-25 parts of coarse aggregate, 10-15 parts of modified lignin blended with flake boron nitride, 3-5 parts of sodium carboxymethyl cellulose, 2-4 parts of water reducer, 40-50 parts of water; The preparation method of the modified lignin blended flaky boron nitride agent is as follows: S01: adding 6 to 8 parts of flake boron nitride and 2 to 5 parts of hydrogen peroxide into 10 to 15 parts of ethanol solvent, stirring evenly, washing with water, and drying to obtain a first flake boron nitride; S02: 4-6 parts of the first boron nitride flakes, 1-2 parts of ammonium bicarbonate and 0.25-0.35 parts of cobalt nitrate solution are added to 10-12 parts of acetone solvent, and the mixture is stirred evenly, and finally washed with water and dried to obtain the second boron nitride flakes; S03: esterify 3-5 parts of lignin and 10-15 parts of 20% by mass gluconic acid solution at a temperature of 150° C. for 24 hours to obtain a lignin blending agent; S04: Add 3 to 5 parts of the second flaky boron nitride and 2 to 3 parts of the lignin blending agent into 20 to 30 parts of deionized water, stir evenly, then add 2 to 6 parts of organic alcohol amine and 1 to 2 parts of barium nitrate aqueous solution, stir for reaction, and after stirring, wash with water and dry to obtain a modified lignin blending flaky boron nitride agent.

2. The high-performance concrete material for the expansion joint anchorage area according to claim 1, characterized in that, The high performance concrete material for the expansion joint anchoring area comprises the following raw materials in parts by weight: 47.5 parts of Portland cement, 17.5 parts of fine aggregate, 22.5 parts of coarse aggregate, 12.5 parts of modified lignin blended flaky boron nitride agent, 4 parts of sodium carboxymethyl cellulose, 3 parts of water reducer, and 45 parts of water.

3. The high-performance concrete material for the expansion joint anchorage area according to claim 1, characterized in that The fine aggregate is river sand with a fineness modulus of 2.6; the coarse aggregate is granite with a particle size of 10 mm; and the water reducer is a polycarboxylate water reducer.

4. The high-performance concrete material for the expansion joint anchorage area according to claim 1, wherein, The S04 stirring temperature is 45-48°C, the stirring time is 1-2h, and the stirring speed is 350-400r / min.

5. The high-performance concrete material for the expansion joint anchorage area according to claim 1, wherein The mass fraction of the SO2 cobalt nitrate solution is 3-5%; the mass fraction of the SO4 barium nitrate aqueous solution is 6-10%.

6. The high-performance concrete material for the expansion joint anchorage area according to claim 1, wherein, The high performance concrete material also includes 6 to 10 parts by weight of a glass fiber regulator and 3 to 5 parts by weight of modified silicon nitride; The preparation method of the glass fiber conditioning agent is: Add 10 to 20 parts of glass fiber to 35 to 40 parts of ethanol solvent, then add 2 to 5 parts of tetraethoxysilane and 1 to 3 parts of hydroxyacetic acid, stir evenly, then add 3 to 6 parts of yttrium / lanthanum composite liquid and 1 to 2 parts of active α-alumina, continue to stir sufficiently, finally wash with water and dry to obtain a glass fiber regulator.

7. A high-performance concrete material for the expansion joint anchorage area according to claim 6, characterized in that The yttrium / lanthanum composite liquid is prepared by adding a 5% by mass yttrium nitrate solution into a 10% by mass sodium silicate aqueous solution which is 3 times the total amount of the yttrium nitrate solution, and then adding a 6% by mass lanthanum nitrate solution into the yttrium nitrate solution, stirring sufficiently to obtain the yttrium / lanthanum composite liquid.

8. The high-performance concrete material for the expansion joint anchorage area according to claim 6, characterized in that, The preparation method of the modified silicon nitride is: S101: heat-treating silicon nitride at 310-320° C. for 10-20 min, then cooling to 55-65° C. at a rate of 2-5° C. / min, keeping warm, and setting aside; S102: Add magnesium oxide to deionized water at a weight ratio of 1:5 and disperse evenly. Then add 2-5% of sodium carboxymethylcellulose and 1-3% of silane coupling agent KH560 based on the total amount of magnesium oxide, stir evenly, wash with water and dry to obtain a magnesium oxide pre-conditioner. S103: Add 2-5 parts of silica sol, 1-3 parts of sodium dodecyl sulfate and 0.35-0.45 parts of sodium citrate to 10-15 parts of a 5% chitosan solution by mass, stir evenly to obtain a silicon nitride treatment agent. S104: Mix the product of S101, the silicon nitride treatment agent and the magnesium oxide pre-conditioner at a weight ratio of 8:3:1, send them into a ball mill for ball milling. The ball milling speed is 750-850 r / min and the ball milling time is 1-2 h. After the ball milling is completed, wash with water and dry to obtain modified silicon nitride.

9. The high-performance concrete material for the expansion joint anchorage area according to claim 8, characterized in that, The mass fraction of the chitosan solution is 5-8%.

10. A preparation method of a high-performance concrete material for a telescopic joint anchorage area according to any one of claims 1 to 9, characterized in that, It includes the following steps: Step 1: Add portland cement, fine aggregate and coarse aggregate to a mixer, stir at a speed of 500-700 r / min for 15-20 min, then add sodium carboxymethylcellulose and a modified lignin-based flaky boron nitride agent, and continue to stir for 5 min to prepare a pre-mixture. Step 2: Add a glass fiber conditioner and modified silicon nitride to water and disperse at a speed of 300-350 r / min for 20-30 min to obtain a conditioner body. Step 3: Stir and mix the pre-mixture, the conditioner body and a water reducer, with a stirring speed of 1000-1200 r / min and stir for 45-55 min. After the stirring is completed, obtain a high-performance concrete material.

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