A preparation method and application of asphalt concrete

Abstract

A preparation method of asphalt concrete of the present invention comprises the following steps: 35-40 parts of asphalt, 25-30 parts of cement, 10-15 parts of coarse aggregate, 9-12 parts of strengthening agent for adjusting and connecting, 8-14 parts of fine aggregate, 5-8 parts of modified filler, 4-6 parts of fly ash, 3-5 parts of silane coupling agent, and 30-35 parts of deionized water. The asphalt concrete of the present invention uses asphalt and cement to blend coarse aggregate, fine aggregate, and fly ash, and adds silane coupling agent to improve the interfacial property of raw materials. At the same time, the strengthening agent for adjusting and connecting and the modified filler added cooperate with each other and work together synergistically. The thermal conductivity, crack resistance, and wear resistance of the product are improved in a balanced and coordinated manner, and the water resistance, freeze-thaw stability of the product are significantly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt concrete, and particularly relates to a preparation method and application of asphalt concrete. Background Art

[0002] Asphalt concrete mixture is a mineral material with a specified gradation composed of appropriate proportions of coarse aggregate, fine aggregate and filler, and is an asphalt mixture that meets technical standards after being mixed with asphalt binder. Asphalt concrete is a composite material, usually used for road surfaces, parking lots, airports, and the core of dams. It is composed of mineral aggregates combined with asphalt and laid and compacted in layers.

[0003] The existing asphalt concrete has poor wear resistance. At the same time, it is difficult to balance and coordinate the improvement of the thermal conductivity and crack resistance of asphalt concrete with the wear resistance. In addition, the product has poor water resistance, freeze - heat stability, which further limits the use efficiency of the product. Summary of the Invention

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide a preparation method and application of asphalt concrete to solve the problems raised in the above background art.

[0005] The present invention solves the technical problems by adopting the following technical solutions:

[0006] The present invention provides a preparation method of asphalt concrete, which includes the following steps:

[0007] Step 1, weighing raw materials by weight:

[0008] 35 - 40 parts of asphalt, 25 - 30 parts of cement, 10 - 15 parts of coarse aggregate, 9 - 12 parts of strength - increasing and adjusting agent, 8 - 14 parts of fine aggregate, 5 - 8 parts of modified filler, 4 - 6 parts of fly ash, 3 - 5 parts of silane coupling agent, 30 - 35 parts of deionized water;

[0009] Step 2, first stirring and mixing the strength - increasing and adjusting agent, modified filler, fly ash, silane coupling agent and deionized water at a speed of 450 - 550 r / min for 1 - 2 h. After mixing is completed, a mixed agent is obtained;

[0010] Step 3, stirring and processing asphalt, cement, coarse aggregate, fine aggregate and the mixed agent. The stirring temperature is 110 - 120 °C, and stirring is carried out for 2 - 3 h. After stirring is completed, the asphalt concrete of the present invention is obtained.

[0011] Preferably, the coarse aggregate is crushed stone with a particle size of 10 - 15 mm; the fine aggregate is fine sand with a particle size of 0.5 - 1.5 mm;

[0012] The fly ash is Class I fly ash; the silane coupling agent is silane coupling agent KH560.

[0013] Preferably, the preparation method of the tone-increasing and strengthening agent is as follows:

[0014] S01: First, mix the flaky talcum powder thoroughly in a 5% potassium permanganate solution with a mass fraction 3 - 5 times the total weight of the flaky talcum powder, then wash with water and dry.

[0015] S02: Mix the dried flaky talcum powder, phosphate buffer solution, and carboxymethyl cellulose in a weight ratio of (4 - 6):(2 - 5):2 to obtain a flaky talcum liquid.

[0016] S03: Preparation of the strengthening treatment agent:

[0017] Mix the nano - silicon carbide whiskers thoroughly in a sufficient amount of sodium silicate solution to obtain a whisker liquid. Mix 5 - 8 parts of the whisker liquid, 3 - 5 parts of the sodium lignosulfonate solution, and 2 - 4 parts of lanthanum oxide thoroughly by stirring to obtain the strengthening treatment agent.

[0018] S04: Mix the flaky talcum liquid and the strengthening treatment agent in a weight ratio of 5:(2 - 3), conduct ball - milling treatment. The ball - milling speed is 1000 - 1500 r / min, ball - mill for 2 h. After ball - milling, wash with water and dry to obtain the tone - increasing and strengthening agent.

[0019] Preferably, the pH value of the phosphate buffer solution in S02 is 5.5.

[0020] In S03, the mass fraction of the sodium silicate solution is 2 - 5%; the mass fraction of the sodium lignosulfonate solution is 3 - 6%.

[0021] Preferably, the average particle size of the nano - silicon carbide whiskers is 300 - 400 nm, and the aspect ratio of the whiskers is 20 - 30.

[0022] Preferably, the preparation method of the modified filler is as follows:

[0023] S11: Irradiate the silicon powder in a proton irradiation chamber for 5 - 10 min with an irradiation power of 350 - 400 W. After irradiation, pre - heat the irradiated silicon powder at 55 - 60 °C for 10 min, and then conduct heat - preservation treatment to obtain the pretreated silicon powder.

[0024] S12: Add the pretreated silicon powder to a kaolin modification liquid with a volume 3 - 5 times the total amount of the pretreated silicon powder, conduct stirring and modification treatment. After stirring, conduct suction filtration and drying to obtain the modified filler.

[0025] Preferably, the stirring speed for the stirring and modification treatment is 550 - 750 r / min, and the stirring time is 45 - 55 min.

[0026] Preferably, the preparation method of the kaolin modification liquid is as follows:

[0027] Add 4-7 parts of kaolin and 1-3 parts of yttrium nitrate solution to 5-8 parts of sodium citrate solution, then add 2-3 parts of silane coupling agent KH550 and 2-4 parts of boron nitride, and stir and mix well to obtain the kaolin modification solution.

[0028] Preferably, the mass fraction of the sodium citrate solution is 5-8%; the mass fraction of the yttrium nitrate solution is 2-5%.

[0029] The present invention also provides an application of a preparation method of asphalt concrete in road paving.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The asphalt concrete of the present invention uses asphalt and cement to blend coarse aggregate, fine aggregate, fly ash, and adds a silane coupling agent to improve the interfacial property of the raw materials. At the same time, the added strengthening agent and modified filler are coordinated and synergistic. The thermal conductivity, crack resistance, and wear resistance of the product are balanced and improved, and the water resistance, freeze-thaw stability of the product are significantly improved; in the preparation of the strengthening agent, flaky talc powder is optimized and improved by potassium permanganate solution, and at the same time, the added phosphate buffer solution and carboxymethyl cellulose are blended to obtain flaky talc solution. At the same time, it is coordinated by an intensifying treatment agent. The nano silicon carbide whiskers in the intensifying treatment agent are in a whisker structure and are improved by sodium silicate solution treatment to improve the stability of the whisker structure. Through the coordination of sodium lignosulfonate solution and lanthanum oxide, the flaky talc powder system is further coordinated. The flaky talc powder system is combined with the whisker system and dispersed in the system to enhance the interfacial property between the raw materials of the system, and at the same time improve the performance coordination and performance stability of the product; the modified filler uses silicon powder irradiated by proton to stimulate its silicon powder activity efficiency, and then is improved by preheating, so as to better blend the kaolin modification solution. The kaolin modification solution is coordinated by kaolin, yttrium nitrate solution, sodium citrate solution, silane coupling agent KH550 and boron nitride. Through the lamellar structure of kaolin and boron nitride raw materials, through the coordination of the raw materials, the coordination effect between the obtained modified filler and the strengthening agent is stronger, and the product performance is further improved. Specific embodiments

[0032] The following is a clear and complete description of the technical solutions in the embodiments of the present invention with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all 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.

[0033] A preparation method of asphalt concrete in this embodiment includes the following steps:

[0034] Step 1: Weigh the raw materials according to parts by weight:

[0035] 35 - 40 parts of asphalt, 25 - 30 parts of cement, 10 - 15 parts of coarse aggregate, 9 - 12 parts of strength - enhancing and adjusting agent, 8 - 14 parts of fine aggregate, 5 - 8 parts of modified filler, 4 - 6 parts of fly ash, 3 - 5 parts of silane coupling agent, 30 - 35 parts of deionized water;

[0036] Step 2: First, stir and mix the strength - enhancing and adjusting agent, modified filler, fly ash, silane coupling agent and deionized water at a speed of 450 - 550 r / min for 1 - 2 h. After mixing, a mixed agent is obtained;

[0037] Step 3: Stir - process asphalt, cement, coarse aggregate, fine aggregate and the mixed agent. The stirring temperature is 110 - 120 °C, and stir for 2 - 3 h. After stirring, the asphalt concrete of the present invention is obtained.

[0038] The coarse aggregate in this embodiment is gravel with a particle size of 10 - 15 mm; the fine aggregate is fine sand with a particle size of 0.5 - 1.5 mm;

[0039] The fly ash is Class I fly ash; the silane coupling agent is silane coupling agent KH560.

[0040] The preparation method of the strength - enhancing and adjusting agent in this embodiment is as follows:

[0041] S01: First, stir and mix flaky talc powder in a 5% potassium permanganate solution with a mass fraction 3 - 5 times the total weight of the flaky talc powder until fully mixed, then wash with water and dry;

[0042] S02: Mix the dried flaky talc powder, phosphate buffer solution and carboxymethyl cellulose in a weight ratio of (4 - 6):(2 - 5):2 to obtain a flaky talc liquid;

[0043] S03: Preparation of the strengthening treatment agent:

[0044] Mix nano - silicon carbide whiskers in a sufficient amount of sodium silicate solution until fully mixed to obtain a whisker liquid. Mix 5 - 8 parts of the whisker liquid, 3 - 5 parts of sodium lignosulfonate solution and 2 - 4 parts of lanthanum oxide and stir them thoroughly to obtain the strengthening treatment agent;

[0045] S04: Mix the flaky talc liquid and the strengthening treatment agent in a weight ratio of 5:(2 - 3), conduct ball - milling treatment. The ball - milling speed is 1000 - 1500 r / min, and ball - mill for 2 h. After ball - milling, wash with water and dry to obtain the strength - enhancing and adjusting agent.

[0046] In S02 of this embodiment, the pH value of the phosphate buffer solution is 5.5;

[0047] In S03, the mass fraction of the sodium silicate solution is 2 - 5%; the mass fraction of the sodium lignosulfonate solution is 3 - 6%.

[0048] In this embodiment, the average particle size of the nano silicon carbide whiskers is 300 - 400 nm, and the aspect ratio of the whiskers is 20 - 30.

[0049] The preparation method of the modified filler in this embodiment is as follows:

[0050] S11: First irradiate the silicon powder in a proton irradiation chamber for 5 - 10 min with an irradiation power of 350 - 400 W. After the irradiation ends, preheat the irradiated silicon powder at 55 - 60 °C for 10 min, and then perform heat preservation treatment to obtain the pretreated silicon powder;

[0051] S12: Add the pretreated silicon powder to the kaolin modification liquid which is 3 - 5 times the total amount of the pretreated silicon powder, and perform stirring modification treatment. After the stirring ends, filter by suction and dry to obtain the modified filler.

[0052] In this embodiment, the stirring speed of the stirring modification treatment is 550 - 750 r / min, and the stirring time is 45 - 55 min.

[0053] The preparation method of the kaolin modification liquid in this embodiment is as follows:

[0054] Add 4 - 7 parts of kaolin and 1 - 3 parts of yttrium nitrate solution to 5 - 8 parts of sodium citrate solution, and then add 2 - 3 parts of silane coupling agent KH550 and 2 - 4 parts of boron nitride, and stir and mix evenly to obtain the kaolin modification liquid.

[0055] In this embodiment, the mass fraction of the sodium citrate solution is 5 - 8%; the mass fraction of the yttrium nitrate solution is 2 - 5%.

[0056] The application of the preparation method of a kind of asphalt concrete in this embodiment in road surface paving.

[0057] Example 1.

[0058] The preparation method of a kind of asphalt concrete in this embodiment includes the following steps:

[0059] Step 1, weigh the raw materials according to parts by weight:

[0060] 35 parts of asphalt, 25 parts of cement, 10 parts of coarse aggregate, 9 parts of strength enhancer, 8 parts of fine aggregate, 5 parts of modified filler, 4 parts of fly ash, 3 parts of silane coupling agent, 30 parts of deionized water;

[0061] Step 2, first stir and mix the strength enhancer, modified filler, fly ash, silane coupling agent and deionized water at a speed of 450 r / min for 1 h. After the mixing ends, obtain the mixed agent;

[0062] Step 3: Mix and process asphalt, cement, coarse aggregate, fine aggregate, and admixture. The mixing temperature is 110 °C, and the mixing lasts for 2 h. After mixing, the asphalt concrete of the present invention is obtained.

[0063] In this embodiment, the coarse aggregate is crushed stone with a particle size of 10 mm; the fine aggregate is fine sand with a particle size of 0.5 mm.

[0064] The fly ash is Class I fly ash; the silane coupling agent is silane coupling agent KH560.

[0065] The preparation method of the strength increasing and conditioning agent in this embodiment is as follows:

[0066] S01: First, stir and mix the flaky talc powder thoroughly in a 5% potassium permanganate solution with a mass fraction 3 times that of the total weight of the flaky talc powder, then wash with water and dry.

[0067] S02: Mix the dried flaky talc powder, phosphate buffer solution, and carboxymethyl cellulose in a weight ratio of 4:2:2 to obtain a flaky talc solution.

[0068] S03: Preparation of the strengthening treatment agent:

[0069] Mix the nano silicon carbide whiskers thoroughly in a sufficient amount of sodium silicate solution to obtain a whisker solution. Mix 5 parts of the whisker solution, 3 parts of the lignosulfonate solution, and 2 parts of lanthanum oxide thoroughly by stirring to obtain the strengthening treatment agent.

[0070] S04: Mix and ball-mill the flaky talc solution and the strengthening treatment agent in a weight ratio of 5:2. The ball-milling speed is 1000 r / min, and the ball-milling lasts for 2 h. After ball-milling, wash with water and dry to obtain the strength increasing and conditioning agent.

[0071] In S02 of this embodiment, the pH value of the phosphate buffer solution is 5.5.

[0072] In S03, the mass fraction of the sodium silicate solution is 2%; the mass fraction of the lignosulfonate solution is 3%.

[0073] In this embodiment, the average particle size of the nano silicon carbide whiskers is 300 nm, and the aspect ratio of the whiskers is 20.

[0074] The preparation method of the modified filler in this embodiment is as follows:

[0075] S11: First, irradiate the silicon powder in a proton irradiation chamber for 5 min with an irradiation power of 350 W. After irradiation, preheat the irradiated silicon powder at 55 °C for 10 min and then perform heat preservation treatment to obtain the pretreated silicon powder.

[0076] S12: Add the pretreated silicon powder to a kaolin modification solution 3 times the total amount of the pretreated silicon powder and perform stirring and modification treatment. After stirring, filter and dry to obtain the modified filler.

[0077] The stirring speed for the stirring modification treatment in this embodiment is 550 r / min, and the stirring time is 45 min.

[0078] The preparation method of the kaolin modification liquid in this embodiment is as follows:

[0079] Add 4 parts of kaolin and 1 part of yttrium nitrate solution to 5 parts of sodium citrate solution, and then add 2 parts of silane coupling agent KH550 and 2 parts of boron nitride, and stir and mix evenly to obtain the kaolin modification liquid.

[0080] The mass fraction of the sodium citrate solution in this embodiment is 5%; the mass fraction of the yttrium nitrate solution is 2%.

[0081] The application of a preparation method of asphalt concrete in this embodiment in road surface paving.

[0082] Example 2.

[0083] A preparation method of asphalt concrete in this embodiment includes the following steps:

[0084] Step 1, weigh raw materials according to parts by weight:

[0085] 40 parts of asphalt, 30 parts of cement, 15 parts of coarse aggregate, 12 parts of strength enhancer, 14 parts of fine aggregate, 8 parts of modified filler, 6 parts of fly ash, 5 parts of silane coupling agent, 35 parts of deionized water;

[0086] Step 2, first stir and mix the strength enhancer, modified filler, fly ash, silane coupling agent and deionized water at a speed of 550 r / min for 2 h, and after mixing is completed, obtain a mixed agent;

[0087] Step 3, stir and process asphalt, cement, coarse aggregate, fine aggregate and the mixed agent, the stirring temperature is 120 °C, stir for 3 h, and after stirring is completed, obtain the asphalt concrete of the present invention.

[0088] The coarse aggregate in this embodiment is gravel with a particle size of 15 mm; the fine aggregate is fine sand with a particle size of 1.5 mm;

[0089] The fly ash is Class I fly ash; the silane coupling agent is silane coupling agent KH560.

[0090] The preparation method of the strength enhancer in this embodiment is as follows:

[0091] S01: First stir and mix the flaky talc powder evenly in a 5% potassium permanganate solution with a mass 5 times that of the total weight of the flaky talc powder, then wash with water and dry;

[0092] S02: Mix the dry flaky talcum powder, phosphate buffer solution, and carboxymethyl cellulose in a weight ratio of 6:5:2 to obtain a flaky talc solution;

[0093] S03: Preparation of the intensifying agent:

[0094] Mix the nano silicon carbide whiskers sufficiently in a sufficient amount of sodium silicate solution to obtain a whisker solution. Blend 8 parts of the whisker solution, 5 parts of the sodium lignosulfonate solution, and 4 parts of lanthanum oxide and stir well to obtain the intensifying agent;

[0095] S04: Mix the flaky talc solution and the intensifying agent in a weight ratio of 5:3, perform ball milling treatment at a ball milling speed of 1500 r / min for 2 h. After the ball milling is completed, wash with water and dry to obtain the enhanced and strengthened agent.

[0096] In S02 of this example, the pH value of the phosphate buffer solution is 5.5;

[0097] In S03, the mass fraction of the sodium silicate solution is 5%; the mass fraction of the sodium lignosulfonate solution is 6%.

[0098] In this example, the average particle size of the nano silicon carbide whiskers is 400 nm, and the aspect ratio of the whiskers is 30.

[0099] The preparation method of the modified filler in this example is as follows:

[0100] S11: First irradiate the silicon powder in a proton irradiation chamber for 10 min at an irradiation power of 400 W. After the irradiation is completed, preheat the irradiated silicon powder at 60 °C for 10 min and then perform heat preservation treatment to obtain the pretreated silicon powder;

[0101] S12: Add the pretreated silicon powder to the kaolin modification solution that is 5 times the total amount of the pretreated silicon powder, perform stirring and modification treatment. After the stirring is completed, filter by suction and dry to obtain the modified filler.

[0102] In this example, the stirring speed of the stirring and modification treatment is 750 r / min, and the stirring time is 55 min.

[0103] The preparation method of the kaolin modification solution in this example is as follows:

[0104] Add 7 parts of kaolin and 3 parts of yttrium nitrate solution to 8 parts of sodium citrate solution, and then add 3 parts of silane coupling agent KH550 and 4 parts of boron nitride, and stir well to obtain the kaolin modification solution.

[0105] In this example, the mass fraction of the sodium citrate solution is 8%; the mass fraction of the yttrium nitrate solution is 5%.

[0106] Application of the preparation method of an asphalt concrete in this example in road surface paving.

[0107] Example 3

[0108] A preparation method of asphalt concrete in this example includes the following steps:

[0109] Step 1: Weigh raw materials by weight parts:

[0110] 37.5 parts of asphalt, 27.5 parts of cement, 12.5 parts of coarse aggregate, 10 parts of strength - increasing and conditioning agent, 11 parts of fine aggregate, 6.5 parts of modified filler, 5 parts of fly ash, 4 parts of silane coupling agent, 32.5 parts of deionized water;

[0111] Step 2: First, stir and mix the strength - increasing and conditioning agent, modified filler, fly ash, silane coupling agent and deionized water at a speed of 500 r / min for 1.5 h. After mixing, a mixed agent is obtained;

[0112] Step 3: Stir - process asphalt, cement, coarse aggregate, fine aggregate and the mixed agent. The stirring temperature is 15 °C and the stirring time is 2.5 h. After stirring, the asphalt concrete of the present invention is obtained.

[0113] The coarse aggregate in this example is crushed stone with a particle size of 12.5 mm; the fine aggregate is fine sand with a particle size of 1.0 mm;

[0114] The fly ash is Class I fly ash; the silane coupling agent is silane coupling agent KH560.

[0115] The preparation method of the strength - increasing and conditioning agent in this example is as follows:

[0116] S01: First, stir and mix flaky talc powder in a 5% potassium permanganate solution with a mass 4 times that of the total weight of the flaky talc powder until fully mixed, then wash with water and dry;

[0117] S02: Mix the dried flaky talc powder, phosphate buffer solution and carboxymethyl cellulose in a weight ratio of 5:3.5:2 to obtain a flaky talc solution;

[0118] S03: Preparation of the strengthening treatment agent:

[0119] Mix nano - silicon carbide whiskers in a sufficient amount of sodium silicate solution until fully mixed to obtain a whisker solution. Mix 6.5 parts of the whisker solution, 4 parts of lignosulfonate solution and 3 parts of lanthanum oxide and stir them fully to obtain the strengthening treatment agent;

[0120] S04: Mix the flaky talc solution and the strengthening treatment agent in a weight ratio of 5:2.5, perform ball - milling treatment. The ball - milling speed is 1250 r / min and the ball - milling time is 2 h. After ball - milling, wash with water and dry to obtain the strength - increasing and conditioning agent.

[0121] In S02 of this example, the pH value of the phosphate buffer solution is 5.5;

[0122] The mass fraction of the sodium silicate solution in S03 is 3.5%; the mass fraction of the sodium lignosulfonate solution is 4.5%.

[0123] In this embodiment, the average particle size of the nano silicon carbide whiskers is 350 nm, and the aspect ratio of the whiskers is 25.

[0124] The preparation method of the modified filler in this embodiment is as follows:

[0125] S11: First irradiate the silicon powder in a proton irradiation chamber for 7.5 min with an irradiation power of 370 W. After the irradiation ends, preheat the irradiated silicon powder at 57 °C for 10 min, and then perform heat preservation treatment to obtain the pretreated silicon powder;

[0126] S12: Add the pretreated silicon powder to the kaolin modification liquid that is 4 times the total amount of the pretreated silicon powder, stir for modification treatment, and after stirring ends, perform suction filtration and drying to obtain the modified filler.

[0127] In this embodiment, the stirring speed for the stirring modification treatment is 600 r / min, and the stirring time is 50 min.

[0128] The preparation method of the kaolin modification liquid in this embodiment is as follows:

[0129] Add 5.5 parts of kaolin and 2 parts of yttrium nitrate solution to 6.5 parts of sodium citrate solution, and then add 2.5 parts of silane coupling agent KH550 and 3 parts of boron nitride, and stir evenly to obtain the kaolin modification liquid.

[0130] In this embodiment, the mass fraction of the sodium citrate solution is 6.5%; the mass fraction of the yttrium nitrate solution is 3.5%.

[0131] The application of a preparation method of asphalt concrete in this embodiment in road surface paving.

[0132] Comparative Example 1.

[0133] The difference from Example 3 is that the enhancer is not added.

[0134] Comparative Example 2.

[0135] The difference from Example 3 is that the stress treatment agent is not added in the preparation of the enhancer.

[0136] Comparative Example 3.

[0137] The difference from Example 3 is that the whisker liquid is not added to the stress treatment agent.

[0138] Comparative Example 4.

[0139] The difference from Example 3 is that the sodium lignosulfonate solution and lanthanum oxide are not added to the stress treatment agent.

[0140] Comparative Example 5

[0141] Different from Example 3, the whisker liquid is replaced with nano silicon carbide whiskers.

[0142] Comparative Example 6

[0143] Different from Example 3, flaky talc liquid is not added in the preparation of the thickening and strengthening agent.

[0144] Comparative Example 7

[0145] Different from Example 3, the modified filler is not added.

[0146] Comparative Example 8

[0147] Different from Example 3, the modified filler is not treated by step S11.

[0148] Comparative Example 9

[0149] Different from Example 3, the modified filler is not treated with kaolin modification liquid.

[0150] Conventional tests were carried out to test the thermal conductivity, crack resistance and wear resistance of the products of Examples 1-3 and Comparative Examples 1-9. The test results are as follows;

[0151]

[0152]

[0153] It can be seen from Comparative Examples 1-9 and Examples 1-3 that;

[0154] The product of Example 3 has a friction coefficient as high as 0.89, a splitting tensile strength as high as 6.6 MPa, and a thermal conductivity as high as 4.4 w / (m·K). The product has excellent wear resistance, and at the same time, the splitting tensile strength and thermal conductivity can be coordinately improved;

[0155] The products of Examples 1-3 and Comparative Examples 1-9 were immersed in water for 24 h, then frozen at -5 °C for 12 h, and finally placed at 65 °C for 12 h. The above is one cycle, and the cycle test was carried out 10 times to test the water resistance, freeze resistance and heat resistance stability of the products. The test results are as follows:

[0156]

[0157] It can be seen from Comparative Examples 1-9 and Example 3 that the product of Example 3 has excellent water resistance, freeze resistance and heat resistance stability. At the same time, if one of the thickening and strengthening agent and the modified filler is not added in the product, the performance of the product deteriorates significantly. By using the two in coordination and synergistic effect, the product performance effect is the most significant;

[0158] When the intensifying agent is not added during the preparation of the intensifying and linking agent, the whisker liquid is not added to the intensifying agent, the sodium lignosulfonate solution and lanthanum oxide are not added to the intensifying agent, the whisker liquid is replaced with nano silicon carbide whiskers, and the flaky talc liquid is not added during the preparation of the intensifying and linking agent, the performance of the product shows a deteriorating trend. The intensifying and linking agent obtained by using the specific whisker liquid, intensifying agent and flaky talc liquid of the present invention has the most significant product performance effect. Replacing with other methods is not as obvious as the effect of the present invention;

[0159] When the modified filler is not treated by the S11 step and the kaolin modification liquid is not used to treat the modified filler, the performance of the product also shows a deteriorating trend to varying degrees. When the kaolin modification liquid is not used, the performance of the product deteriorates more significantly.

[0160] The preparation of the kaolin modification liquid has a great influence on the performance of the product. Further research on this is as follows:

[0161] The preparation method of the kaolin modification liquid is as follows:

[0162] Add 5.5 parts of kaolin and 2 parts of yttrium nitrate solution to 6.5 parts of sodium citrate solution, and then add 2.5 parts of silane coupling agent KH550 and 3 parts of boron nitride, and stir evenly to obtain the kaolin modification liquid.

[0163] Taking the product's water resistance, frost resistance and heat stability tests as an example;

[0164] Experimental Example 1.

[0165] The only difference from Example 3 is that the yttrium nitrate solution is not added during the preparation of the kaolin modification liquid.

[0166] Experimental Example 2.

[0167] The only difference from Example 3 is that the kaolin is not added during the preparation of the kaolin modification liquid.

[0168] Experimental Example 3.

[0169] The only difference from Example 3 is that the boron nitride is not added during the preparation of the kaolin modification liquid.

[0170] Experimental Example 4.

[0171] The only difference from Example 3 is that the silane coupling agent KH550 is not added during the preparation of the kaolin modification liquid.

[0172] Experimental Example 5.

[0173] The only difference from Example 3 is that water is used instead of the sodium citrate solution.

[0174]

[0175] As can be seen from Experimental Examples 1-5, since kaolin was not added during the preparation of the kaolin modification liquid, the performance of the product was most significantly affected during the preparation based on the kaolin modification liquid. Next was the case where boron nitride was not added. When yttrium nitrate solution was not added during the preparation based on the kaolin modification liquid, silane coupling agent KH550 was not added during the preparation based on the kaolin modification liquid, or water was used instead of the sodium citrate solution, the performance of the product showed a deteriorating trend. Through the mutual coordination and synergy of the raw materials to achieve common synergy enhancement, the kaolin modification liquid based on this was the most significant for the product performance. None of the raw materials during the preparation based on the kaolin modification liquid can be missing. Using other methods to replace them is not as effective as the present invention.

[0176] 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 encompassed within the present invention.

[0177] 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 method for preparing asphalt concrete, characterized in that: The following steps are involved: Step 1: weigh the raw materials according to weight: Asphalt 35-40 parts, cement 25-30 parts, coarse aggregate 10-15 parts, strength-enhancing agent 9-12 parts, fine aggregate 8-14 parts, modified filler 5-8 parts, fly ash 4-6 parts, silane coupling agent 3-5 parts, deionized water 30-35 parts; Step 2, stirring and mixing the strengthening agent, modified filler, fly ash, silane coupling agent and deionized water at a speed of 450-550 r / min for 1-2 hours, and obtaining a mixed agent after the mixing is completed; Step 3: Mixing asphalt, cement, coarse aggregate, fine aggregate and mixing agent at a temperature of 110-120° C. for 2-3 hours to obtain asphalt concrete; The preparation method of the strengthening agent is as follows: S01: Stir and mix the flaky talc powder in a 5% potassium permanganate solution which is 3 to 5 times the total weight of the flaky talc powder, and then wash and dry; S02: mixing dry flaky talc powder, phosphate buffer solution and carboxymethyl cellulose in a weight ratio of (4-6):(2-5):2 to obtain a flaky talc liquid; S03: Emphasis on the preparation of treatment agents: The nano silicon carbide whiskers are mixed with a sufficient amount of sodium silicate solution to obtain a whisker solution, and 5 to 8 parts of the whisker solution, 3 to 5 parts of sodium lignin sulfonate solution, and 2 to 4 parts of lanthanum oxide are mixed and stirred to obtain a stress treatment agent; S04: mixing the flaky talc and the strengthening agent in a weight ratio of 5:(2-3) and subjecting them to ball milling at a ball milling speed of 1000-1500 r / min for 2 h. After the ball milling is completed, washing and drying are performed to obtain a strengthening agent; The preparation method of the modified filler is: S11: irradiating the silicon powder in a proton irradiation box for 5 to 10 minutes at an irradiation power of 350 to 400 W. After the irradiation, preheating the irradiated silicon powder at 55 to 60° C. for 10 minutes, and then heat-insulating the silicon powder to obtain pretreated silicon powder; S12: adding the pretreated silicon powder to a kaolin modification liquid having a weight of 3 to 5 times the total weight of the pretreated silicon powder, stirring and modifying the liquid, filtering and drying after the stirring is completed, to obtain a modified filler; The preparation method of kaolin modified liquid is as follows: Add 4 to 7 parts of kaolin and 1 to 3 parts of yttrium nitrate solution into 5 to 8 parts of sodium citrate solution, then add 2 to 3 parts of silane coupling agent KH550 and 2 to 4 parts of boron nitride, stir and mix thoroughly to obtain kaolin modified liquid.

2. The method for preparing asphalt concrete according to claim 1, characterized in that: The coarse aggregate is crushed stone with a particle size of 10 to 15 mm; the fine aggregate is fine sand with a particle size of 0.5 to 1.5 mm; The fly ash is Class I fly ash; and the silane coupling agent is silane coupling agent KH560.

3. The method for preparing asphalt concrete according to claim 1, characterized in that: The pH value of the phosphate buffer solution in S02 is 5.5; The mass fraction of the sodium silicate solution in S03 is 2-5%; the mass fraction of the sodium lignin sulfonate solution is 3-6%.

4. The method for preparing asphalt concrete according to claim 1, characterized in that: The average particle size of the nano silicon carbide whisker is 300-400nm, and the aspect ratio of the whisker is 20-30.

5. The method for preparing asphalt concrete according to claim 1, characterized in that: The stirring speed of the stirring modification treatment is 550-750 r / min, and the stirring time is 45-55 min.

6. The method for preparing asphalt concrete according to claim 1, characterized in that: The mass fraction of the sodium citrate solution is 5-8%; the mass fraction of the yttrium nitrate solution is 2-5%.

7. Use of the method for preparing asphalt concrete according to any one of claims 1 to 6 in road paving.

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