Asphalt mixture with ecological function and preparation method and application thereof

Abstract

The present invention relates to the technical field of road engineering construction, and specifically discloses an asphalt mixture with ecological functions, a preparation method and application thereof. The asphalt mixture with ecological functions comprises emulsified asphalt, cement, anionic emulsifier-modified coal gangue powder, matrix asphalt, microbial liquid and coal gangue coarse aggregate; the microbial liquid is a mixed liquid of Burkholderia multivora, Pseudomonas stutzeri and Bacillus megaterium. The present invention utilizes the synergistic effect of each component to effectively solve the problem in the prior art that coal gangue materials as asphalt fillers are not conducive to road ecological maintenance. While improving road performance, it can also promote ecological restoration of the surrounding environment, improve poor soil, and be beneficial to highway construction and environmental improvement in the Gobi region.

Description

Technical Field

[0001] The invention relates to the technical field of road engineering construction, and specifically discloses an asphalt mixture with ecological function and a preparation method and application thereof. Background Art

[0002] Highways are the main transportation channels in the Gobi Desert. The Gobi Desert usually has little rainfall and water resources, making it difficult for plants to obtain enough water for growth and metabolism. The soil in the Gobi Desert is usually barren, lacking nutrients and organic matter, which is very unfavorable for plant growth. With the rapid development of highway maintenance, more and more people are paying attention to highway maintenance technologies with ecological benefits. For example, emulsified asphalt mixtures with ecological functions can not only provide better road performance and service life in road construction, but also assist in the reconstruction of vegetation beside the highway, which has good ecological protection significance for the Gobi slopes.

[0003] Gangue is a byproduct of coal mining and utilization. It contains a large amount of inorganic substances and a small amount of organic substances, which causes serious pollution to the environment. In addition, gangue easily releases harmful substances such as acidic substances and heavy metals in the natural environment, causing pollution to the surrounding water bodies. Therefore, the treatment of gangue has always been an important research topic in solid waste treatment.

[0004] Research has found that coal gangue as filler can provide good bearing capacity and stability, and roads paved with coal gangue as filler have sufficient structural strength. Compared with traditional fillers such as natural stones, the recycling of coal gangue as waste has lower costs, which helps to reduce the cost of road construction and maintenance. However, coal gangue contains many metal ions, which are prone to coordination and electrostatic adsorption, which is not conducive to road ecological maintenance. Based on this, the development of an asphalt mixture containing coal gangue and with ecological functions has great practical significance for Gobi highway construction and vegetation maintenance. Summary of the invention

[0005] In view of the problem that the use of gangue materials as asphalt fillers in the prior art is not conducive to road ecological maintenance, the present invention provides an asphalt mixture with ecological functions. The present invention uses emulsified asphalt, cement, anionic emulsifier-modified gangue powder, matrix asphalt, microbial liquid and gangue coarse aggregate as raw materials to prepare an asphalt mixture with good ecological functions. While improving road performance, it can also promote ecological restoration of the surrounding environment, improve poor soil, promote vegetation growth, and is beneficial to highway construction in the Gobi region and slope greening maintenance, providing a new idea for road beautification and environmental improvement.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The first aspect of the present invention provides an asphalt mixture with ecological functions, comprising the following raw material components by weight: 1-10 parts of emulsified asphalt, 1-10 parts of cement, 2-15 parts of anionic emulsifier-modified coal gangue powder, 40-50 parts of base asphalt, 1-5 parts of microbial liquid and 85-95 parts of coal gangue coarse aggregate;

[0008] The microbial bacterial liquid is a mixed bacterial liquid of Burkholderia multivora, Pseudomonas stutzeri and Bacillus megaterium.

[0009] Compared with the prior art, the present invention modifies the gangue powder on the one hand, and the polar substances on the surface of the gangue powder can be adsorbed and bonded with the carboxylate or sulfonate in the structure of the anionic emulsifier, which can further improve the microstructure and microvoids of the gangue interface. On the other hand, due to the presence of a certain cationic emulsifier on the surface of the emulsified asphalt, the anionic emulsifier-modified gangue powder forms a charge attraction effect, which improves the interfacial adhesion between the gangue powder and the asphalt, and further enhances the mechanical properties of the asphalt mixture. In addition, the emulsified asphalt can also effectively improve the water retention of the soil and improve the soil fertility; and the anionic emulsifier-modified gangue powder and the emulsified asphalt will form a slurry, which can not only be coated on the surface of the gangue coarse aggregate to fill the aggregate pores, but also react with cement to increase the strength of the asphalt mixture.

[0010] The microbial liquid can combine with the metal ions in the gangue aggregate by means of electrostatic action and coordination action, so that the microbial strains are firmly adsorbed on the surface of the gangue aggregate. The intervention of exogenous microorganisms not only affects the internal environment of the gangue matrix, but also changes the flora structure in the asphalt mixture, reduces the absorption stress of the gangue matrix asphalt mixture on plant nutrients, and improves the survival rate of road slope plants. More importantly, the anionic emulsifier in the present invention can also provide a suitable growth environment for microbial strains, reduce the loss of nitrogen in the gangue matrix, increase the number of microorganisms in the gangue, promote more bacteria to interact with the gangue and then release nutrients, so that the strains in the soil of the road slope can better reproduce and grow, improve soil barrenness, promote the growth of vegetation, and further improve the ecological maintenance function of the asphalt mixture.

[0011] The present invention uses coal gangue as the matrix material, utilizes emulsified modified coal gangue and microbial treatment and the synergistic effect of various component raw materials, effectively solves the problem that coal gangue asphalt mixture is not conducive to road ecological maintenance. While improving road performance, it can also promote the ecological restoration of the surrounding environment, improve poor soil, and promote vegetation growth, providing a new idea for the environmental construction of harsh roads such as Gobi roads.

[0012] Preferably, the ratio of the number of live bacteria of Burkholderia multivora, Pseudomonas stutzeri and Bacillus megaterium in the microbial liquid is 1:0.2:1-1:0.5:1, and the number of live bacteria in the microbial liquid is (1×10 8 )-(1×10 9 )CFU / mL.

[0013] Further preferably, the deposit number of the Burkholderia polyphaga is BNCC365307.

[0014] Further preferably, the deposit number of the Pseudomonas stutzeri is BNCC367787.

[0015] Further preferably, the deposit number of the Bacillus megaterium is BNCC190686.

[0016] Preferably, the method for preparing the emulsified asphalt comprises the following steps:

[0017] S1. Heating the base asphalt to 130°C-150°C and keeping the temperature to obtain pretreated base asphalt;

[0018] S2, dispersing the cationic emulsifier in deionized water, adjusting the pH to 2.0-2.5, and obtaining an emulsion;

[0019] S3. Evenly mix the emulsion and the pretreated matrix asphalt, raise the temperature to 90° C.-120° C., and grind at high speed to obtain emulsified asphalt.

[0020] Further preferably, in S1, the insulation time is 30 min-50 min.

[0021] Further preferably, in S2, the cationic emulsifier is any one or two of dodecyl ammonium chloride, hexadecyl trimethyl ammonium bromide or hexadecyl pyridinium bromide.

[0022] Further preferably, in S2, the mass volume ratio of the cationic emulsifier to deionized water is 1g:10mL-1g:15mL.

[0023] Further preferably, in S3, the mass ratio of the emulsion to the pretreated matrix asphalt is 0.5:1-0.6:1.

[0024] Further preferably, in S3, the rotation speed of the high-speed grinding is 1800rpm-2000rpm, and the time of the high-speed grinding is 1min-2min.

[0025] Preferably, the preparation method of the anionic emulsifier-modified coal gangue powder comprises the following steps: uniformly mixing the anionic emulsifier and the coal gangue powder, and grinding them at 85° C.-95° C. to obtain the anionic emulsifier-modified coal gangue powder.

[0026] Further preferably, the particle size of the coal gangue powder is 0.15mm-1.5mm.

[0027] Further preferably, the mass ratio of the anionic emulsifier to the coal gangue powder is 0.1:1-0.3:1.

[0028] Further preferably, the anionic emulsifier is sodium dodecyl sulfate and sodium rosin acid in a mass ratio of 1:1-1:1.2.

[0029] Further preferably, the rotation speed of the grinding process is 600 rpm-800 rpm, and the time of the grinding process is 1 h-3 h.

[0030] Preferably, the cement is Portland cement.

[0031] Preferably, the particle size of the coal gangue coarse aggregate is 3mm-25mm.

[0032] Further preferably, the particle size of the coal gangue coarse aggregate is 5mm-15mm.

[0033] The second aspect of the present invention provides a method for preparing the asphalt mixture with ecological function, comprising the following steps:

[0034] Step 1, high temperature sterilizing the gangue coarse aggregate at 118° C.-121° C. for 20 min-30 min to obtain pretreated gangue coarse aggregate, and uniformly mixing the microbial liquid with the pretreated gangue coarse aggregate to obtain a first component;

[0035] Step 2: Evenly mix the emulsified asphalt and the anionic emulsifier-modified coal gangue powder to obtain a second component;

[0036] Step 3: Evenly mix the first component and the second component, add cement and matrix asphalt, and mix evenly to obtain an asphalt mixture with ecological functions.

[0037] The third aspect of the present invention provides the use of the asphalt mixture with ecological functions or the asphalt mixture with ecological functions prepared by the preparation method of the asphalt mixture with ecological functions in the field of road engineering construction.

[0038] In summary, the present invention provides an asphalt mixture with ecological functions prepared from emulsified asphalt, cement, anionic emulsifier modified coal gangue powder, matrix asphalt, microbial liquid and coal gangue coarse aggregate as raw materials, and utilizes the synergistic effect of each component to effectively solve the problem that coal gangue materials as asphalt fillers in the prior art are not conducive to road ecological maintenance. The technical solution of the present invention can not only improve road performance, but also promote the ecological restoration of the surrounding environment, improve poor soil, promote vegetation growth, and facilitate slope greening maintenance, providing a new idea for highway construction and road beautification in harsh environments such as the Gobi region. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A comparison chart showing the effects of the asphalt mixtures described in each embodiment and comparative example on the potassium content in the soil;

[0040] Figure 2 A comparison diagram of the effects of the asphalt mixtures described in each embodiment and comparative example on the phosphorus content in the soil;

[0041] Figure 3 It is a comparison chart of the effects of the asphalt mixtures described in various embodiments and comparative examples on the nitrogen content in the soil. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] The preparation method of the activated bacterial solution for expanded culture used in each embodiment and comparative example includes the following contents:

[0044] Burkholderia multivora, Pseudomonas stutzeri and Bacillus megaterium were inoculated on the activation medium respectively, and activated and cultured at 28℃-30℃, and then inoculated into the fermentation medium at an inoculum volume percentage of 2%, and fermented until the number of viable bacteria in the product reached 1×10 8 CFU / mL.

[0045] Activation culture medium: Tryptone: 17.0g, beef powder: 3.0g, sodium chloride: 5.0g, dipotassium hydrogen phosphate: 2.5g, glucose: 2.5g, add distilled water to 1000mL, pH: 7.3 (25℃), sterilize at 121℃, 0.1MPa for 30min before use.

[0046] The fermentation medium is LB liquid medium.

[0047] Example 1

[0048] This embodiment provides an asphalt mixture with ecological function and a preparation method thereof, which specifically includes the following steps:

[0049] The asphalt mixture with ecological function includes the following raw material components by mass fraction: 8 parts of emulsified asphalt, 8 parts of silicate cement, 10 parts of coal gangue powder modified by anionic emulsifier, 45 parts of matrix asphalt, 3 parts of microbial liquid and 90 parts of coal gangue coarse aggregate;

[0050] The microbial liquid is a mixed liquid of Burkholderia multivora, Pseudomonas stutzeri and Bacillus megaterium with a live bacteria count ratio of 1:0.4:1. The live bacteria count in the microbial liquid is 5×10 8 CFU / mL.

[0051] The preparation method of the asphalt mixture with ecological function includes the following contents:

[0052] Step 1, high-temperature sterilizing the gangue coarse aggregate at 120° C. for 25 minutes to obtain pretreated gangue coarse aggregate, and uniformly mixing the microbial liquid with the pretreated gangue coarse aggregate to obtain a first component;

[0053] Step 2: Evenly mix the emulsified asphalt and the anionic emulsifier-modified coal gangue powder to obtain a second component;

[0054] Step 3: Evenly mix the first component and the second component, add cement and matrix asphalt, and mix evenly to obtain an asphalt mixture with ecological functions.

[0055] The preparation method of the emulsified asphalt comprises the following steps:

[0056] S1. Heating 100 g of base asphalt to 140° C. and keeping the temperature for 40 min to obtain pretreated base asphalt;

[0057] S2, dispersing 5 g of dodecyl ammonium chloride in 50 mL of deionized water, adding 1 mol / L hydrochloric acid solution to adjust the pH to 2.2, to obtain an emulsion;

[0058] S3. Evenly mix the emulsion and the pretreated matrix asphalt, raise the temperature to 100° C., and grind at a speed of 2000 rpm for 1 min to obtain emulsified asphalt.

[0059] The preparation method of the anionic emulsifier modified coal gangue powder comprises the following steps: uniformly mixing 20 g of a mixture of sodium dodecyl sulfate and sodium rosin acid in a mass ratio of 1:1 with 100 g of coal gangue powder with a particle size of 1 mm, and grinding the mixture at 90° C. and a rotation speed of 700 rpm for 2 hours to obtain the anionic emulsifier modified coal gangue powder.

[0060] The particle size of the coal gangue coarse aggregate is 10 mm.

[0061] Example 2

[0062] This embodiment provides an asphalt mixture with ecological function and a preparation method thereof, which specifically includes the following steps:

[0063] The asphalt mixture with ecological function includes the following raw material components by mass fraction: 7 parts of emulsified asphalt, 5 parts of silicate cement, 13 parts of coal gangue powder modified by anionic emulsifier, 42 parts of matrix asphalt, 4 parts of microbial liquid and 95 parts of coal gangue coarse aggregate;

[0064] The microbial liquid is a mixed liquid of Burkholderia multivora, Pseudomonas stutzeri and Bacillus megaterium with a live bacteria count ratio of 1:0.3:1. The live bacteria count in the microbial liquid is 7×10 8 CFU / mL.

[0065] The preparation method of the asphalt mixture with ecological function includes the following contents:

[0066] Step 1, high-temperature sterilizing the gangue coarse aggregate at 120° C. for 30 minutes to obtain pretreated gangue coarse aggregate, and uniformly mixing the microbial liquid with the pretreated gangue coarse aggregate to obtain a first component;

[0067] Step 2: Evenly mix the emulsified asphalt and the anionic emulsifier-modified coal gangue powder to obtain a second component;

[0068] Step 3: Evenly mix the first component and the second component, add cement and matrix asphalt, and mix evenly to obtain an asphalt mixture with ecological functions.

[0069] The preparation method of the emulsified asphalt comprises the following steps:

[0070] S1. Heating 100 g of base asphalt to 145° C. and keeping the temperature for 40 min to obtain pretreated base asphalt;

[0071] S2, dispersing 5 g of hexadecyltrimethylammonium bromide in 50 mL of deionized water, adding 1 mol / L hydrochloric acid solution to adjust the pH to 2.4, to obtain an emulsion;

[0072] S3. Evenly mix the emulsion and the pretreated matrix asphalt, raise the temperature to 100° C., and grind at a speed of 2000 rpm for 1 min to obtain emulsified asphalt.

[0073] The preparation method of the anionic emulsifier modified coal gangue powder comprises the following steps: uniformly mixing 20 g of a mixture of sodium dodecyl sulfate and sodium rosin acid in a mass ratio of 1:1 with 100 g of coal gangue powder with a particle size of 1 mm, and grinding the mixture at 90° C. and a rotation speed of 650 rpm for 3 hours to obtain the anionic emulsifier modified coal gangue powder.

[0074] The particle size of the coal gangue coarse aggregate is 10 mm.

[0075] Example 3

[0076] This embodiment provides an asphalt mixture with ecological function and a preparation method thereof, which specifically includes the following steps:

[0077] The asphalt mixture with ecological function includes the following raw material components by mass fraction: 6 parts of emulsified asphalt, 8 parts of silicate cement, 15 parts of coal gangue powder modified by anionic emulsifier, 40 parts of matrix asphalt, 4 parts of microbial liquid and 85 parts of coal gangue coarse aggregate;

[0078] The microbial liquid is a mixed liquid of Burkholderia multivora, Pseudomonas stutzeri and Bacillus megaterium with a live bacteria count ratio of 1:0.5:1. The live bacteria count in the microbial liquid is 5×10 8 CFU / mL.

[0079] The preparation method of the asphalt mixture with ecological function includes the following contents:

[0080] Step 1, high-temperature sterilizing the gangue coarse aggregate at 120° C. for 25 minutes to obtain pretreated gangue coarse aggregate, and uniformly mixing the microbial liquid with the pretreated gangue coarse aggregate to obtain a first component;

[0081] Step 2: Evenly mix the emulsified asphalt and the anionic emulsifier-modified coal gangue powder to obtain a second component;

[0082] Step 3: Evenly mix the first component and the second component, add cement and matrix asphalt, and mix evenly to obtain an asphalt mixture with ecological functions.

[0083] The preparation method of the emulsified asphalt comprises the following steps:

[0084] S1. Heating 100 g of base asphalt to 145° C. and keeping the temperature for 40 min to obtain pretreated base asphalt;

[0085] S2, dispersing 5 g of hexadecyltrimethylammonium bromide in 50 mL of deionized water, adding 1 mol / L hydrochloric acid solution to adjust the pH to 2.3, to obtain an emulsion;

[0086] S3. Evenly mix the emulsion and the pretreated matrix asphalt, raise the temperature to 110° C., and grind at a high speed of 1900 rpm for 1 min to obtain emulsified asphalt.

[0087] The preparation method of the anionic emulsifier modified coal gangue powder comprises the following steps: uniformly mixing 22 g of a mixture of sodium dodecyl sulfate and sodium rosin acid in a mass ratio of 1:1.2 with 100 g of coal gangue powder with a particle size of 1 mm, and grinding the mixture at 90° C. and a rotation speed of 700 rpm for 2 hours to obtain the anionic emulsifier modified coal gangue powder.

[0088] The particle size of the coal gangue coarse aggregate is 15 mm.

[0089] Comparative Example 1

[0090] This comparative example provides an asphalt mixture with ecological functions and a preparation method thereof. The difference from Example 1 is that the microbial liquid is a mixed liquid of Burkholderia multivora and Pseudomonas stutzeri in a mass ratio of 1:0.4. The other contents remain unchanged, specifically including the following contents:

[0091] The asphalt mixture with ecological function includes the following raw material components by mass fraction: 4 parts of emulsified asphalt, 3 parts of silicate cement, 10 parts of coal gangue powder modified by anionic emulsifier, 45 parts of matrix asphalt, 3 parts of microbial liquid and 90 parts of coal gangue coarse aggregate;

[0092] The microbial bacterial liquid is a mixed bacterial liquid of Burkholderia multivora and Pseudomonas stutzeri with a live bacterial count ratio of 1:0.4, and the live bacterial count in the microbial bacterial liquid is 5×10 8 CFU / mL.

[0093] The preparation method of the asphalt mixture with ecological function includes the following contents:

[0094] Step 1, high-temperature sterilizing the gangue coarse aggregate at 120° C. for 25 minutes to obtain pretreated gangue coarse aggregate, and uniformly mixing the microbial liquid with the pretreated gangue coarse aggregate to obtain a first component;

[0095] Step 2: Evenly mix the emulsified asphalt and the anionic emulsifier-modified coal gangue powder to obtain a second component;

[0096] Step 3: Evenly mix the first component and the second component, add cement and matrix asphalt, and mix evenly to obtain an asphalt mixture with ecological functions.

[0097] The preparation method of the emulsified asphalt comprises the following steps:

[0098] S1. Heating 100 g of base asphalt to 140° C. and keeping the temperature for 40 min to obtain pretreated base asphalt;

[0099] S2, dispersing 5 g of dodecyl ammonium chloride in 50 mL of deionized water, adding 1 mol / L hydrochloric acid solution to adjust the pH to 2.2, to obtain an emulsion;

[0100] S3. Evenly mix the emulsion and the pretreated matrix asphalt, raise the temperature to 100° C., and grind at a speed of 2000 rpm for 1 min to obtain emulsified asphalt.

[0101] The preparation method of the anionic emulsifier modified coal gangue powder comprises the following steps: uniformly mixing 20 g of a mixture of sodium dodecyl sulfate and sodium rosin acid in a mass ratio of 1:1 with 100 g of coal gangue powder with a particle size of 1 mm, and grinding the mixture at 90° C. and a rotation speed of 700 rpm for 2 hours to obtain the anionic emulsifier modified coal gangue powder.

[0102] The particle size of the coal gangue coarse aggregate is 10 mm.

[0103] Comparative Example 2

[0104] This comparative example provides an asphalt mixture with ecological functions and a preparation method thereof. The difference from Example 1 is that the microbial liquid is a mixed liquid of Burkholderia multivora and Bacillus megaterium in a mass ratio of 1:1. The other contents remain unchanged, specifically including the following contents:

[0105] The asphalt mixture with ecological function includes the following raw material components by mass fraction: 4 parts of emulsified asphalt, 3 parts of silicate cement, 10 parts of coal gangue powder modified by anionic emulsifier, 45 parts of matrix asphalt, 3 parts of microbial liquid and 90 parts of coal gangue coarse aggregate;

[0106] The microbial liquid is a mixed liquid of Burkholderia multivora and Bacillus megaterium with a live bacteria count ratio of 1:1, and the live bacteria count in the microbial liquid is 5×10 8 CFU / mL.

[0107] The preparation method of the asphalt mixture with ecological function includes the following contents:

[0108] Step 1, high-temperature sterilizing the gangue coarse aggregate at 120° C. for 25 minutes to obtain pretreated gangue coarse aggregate, and uniformly mixing the microbial liquid with the pretreated gangue coarse aggregate to obtain a first component;

[0109] Step 2: Evenly mix the emulsified asphalt and the anionic emulsifier-modified coal gangue powder to obtain the second component;

[0110] Step 3: Evenly mix the first component and the second component, add cement and matrix asphalt, and mix evenly to obtain an asphalt mixture with ecological functions.

[0111] The preparation method of the emulsified asphalt comprises the following steps:

[0112] S1. Heating 100 g of base asphalt to 140° C. and keeping the temperature for 40 min to obtain pretreated base asphalt;

[0113] S2, dispersing 5 g of dodecyl ammonium chloride in 50 mL of deionized water, adding 1 mol / L hydrochloric acid solution to adjust the pH to 2.2, to obtain an emulsion;

[0114] S3. Evenly mix the emulsion and the pretreated matrix asphalt, raise the temperature to 100° C., and grind at a speed of 2000 rpm for 1 min to obtain emulsified asphalt.

[0115] The preparation method of the anionic emulsifier modified coal gangue powder comprises the following steps: uniformly mixing 20 g of a mixture of sodium dodecyl sulfate and sodium rosin acid in a mass ratio of 1:1 with 100 g of coal gangue powder with a particle size of 1 mm, and grinding the mixture at 90° C. and a rotation speed of 700 rpm for 2 hours to obtain the anionic emulsifier modified coal gangue powder.

[0116] The particle size of the coal gangue coarse aggregate is 10 mm.

[0117] Comparative Example 3

[0118] This comparative example provides an asphalt mixture with ecological functions and a preparation method thereof. The difference from Example 1 is that the microbial liquid is a mixed liquid of Pseudomonas stutzeri and Bacillus megaterium in a mass ratio of 0.4:1, and other contents remain unchanged, specifically including the following contents:

[0119] The asphalt mixture with ecological function includes the following raw material components by mass fraction: 4 parts of emulsified asphalt, 3 parts of silicate cement, 10 parts of coal gangue powder modified by anionic emulsifier, 45 parts of matrix asphalt, 3 parts of microbial liquid and 90 parts of coal gangue coarse aggregate;

[0120] The microbial liquid is a mixed liquid of Pseudomonas stutzeri and Bacillus megaterium with a live bacteria count ratio of 0.4:1. The live bacteria count in the microbial liquid is 5×10 8 CFU / mL.

[0121] The preparation method of the asphalt mixture with ecological function includes the following contents:

[0122] Step 1, high-temperature sterilizing the gangue coarse aggregate at 120° C. for 25 minutes to obtain pretreated gangue coarse aggregate, and uniformly mixing the microbial liquid with the pretreated gangue coarse aggregate to obtain a first component;

[0123] Step 2: Evenly mix the emulsified asphalt and the anionic emulsifier-modified coal gangue powder to obtain a second component;

[0124] Step 3: Evenly mix the first component and the second component, add cement and matrix asphalt, and mix evenly to obtain an asphalt mixture with ecological functions.

[0125] The preparation method of the emulsified asphalt comprises the following steps:

[0126] S1. Heating 100 g of base asphalt to 140° C. and keeping the temperature for 40 min to obtain pretreated base asphalt;

[0127] S2, dispersing 5 g of dodecyl ammonium chloride in 50 mL of deionized water, adding 1 mol / L hydrochloric acid solution to adjust the pH to 2.2, to obtain an emulsion;

[0128] S3. Evenly mix the emulsion and the pretreated matrix asphalt, raise the temperature to 100° C., and grind at a speed of 2000 rpm for 1 min to obtain emulsified asphalt.

[0129] The preparation method of the anionic emulsifier modified coal gangue powder comprises the following steps: uniformly mixing 20 g of a mixture of sodium dodecyl sulfate and sodium rosin acid in a mass ratio of 1:1 with 100 g of coal gangue powder with a particle size of 1 mm, and grinding the mixture at 90° C. and a rotation speed of 700 rpm for 2 hours to obtain the anionic emulsifier modified coal gangue powder.

[0130] The particle size of the coal gangue coarse aggregate is 10 mm.

[0131] Comparative Example 4

[0132] This comparative example provides an asphalt mixture with ecological functions and a preparation method thereof, which is different from Example 1 in that emulsified asphalt is not added, and other contents remain unchanged, specifically including the following contents:

[0133] The asphalt mixture with ecological function includes the following raw material components by mass fraction: 3 parts of silicate cement, 10 parts of coal gangue powder modified by anionic emulsifier, 45 parts of matrix asphalt, 3 parts of microbial liquid and 90 parts of coal gangue coarse aggregate;

[0134] The microbial liquid is a mixed liquid of Burkholderia multivora, Pseudomonas stutzeri and Bacillus megaterium with a live bacteria count ratio of 1:0.4:1. The live bacteria count in the microbial liquid is 5×10 8 CFU / mL.

[0135] The preparation method of the asphalt mixture with ecological function includes the following contents:

[0136] Step 1, high-temperature sterilizing the gangue coarse aggregate at 120° C. for 25 minutes to obtain pretreated gangue coarse aggregate, and uniformly mixing the microbial liquid with the pretreated gangue coarse aggregate to obtain a first component;

[0137] Step 2: Evenly mix the first component and the anionic emulsifier-modified coal gangue powder, add cement and matrix asphalt, and mix evenly to obtain an asphalt mixture with ecological functions.

[0138] The preparation method of the anionic emulsifier modified coal gangue powder comprises the following steps: uniformly mixing 20 g of a mixture of sodium dodecyl sulfate and sodium rosin acid in a mass ratio of 1:1 with 100 g of coal gangue powder with a particle size of 1 mm, and grinding the mixture at 90° C. and a rotation speed of 700 rpm for 2 hours to obtain the anionic emulsifier modified coal gangue powder.

[0139] The particle size of the coal gangue coarse aggregate is 10 mm.

[0140] Comparative Example 5

[0141] This comparative example provides an asphalt mixture with ecological functions and a preparation method thereof, which is different from Example 1 in that the gangue powder is not modified by anionic emulsifier, and other contents remain unchanged, specifically including the following contents:

[0142] The asphalt mixture with ecological function includes the following raw material components by mass fraction: 4 parts of emulsified asphalt, 3 parts of silicate cement, 10 parts of coal gangue powder, 45 parts of matrix asphalt, 3 parts of microbial liquid and 90 parts of coal gangue coarse aggregate;

[0143] The microbial liquid is a mixed liquid of Burkholderia multivora, Pseudomonas stutzeri and Bacillus megaterium with a live bacteria count ratio of 1:0.4:1. The live bacteria count in the microbial liquid is 5×10 8 CFU / mL.

[0144] The preparation method of the asphalt mixture with ecological function includes the following contents:

[0145] Step 1, high-temperature sterilizing the gangue coarse aggregate at 120° C. for 25 minutes to obtain pretreated gangue coarse aggregate, and uniformly mixing the microbial liquid with the pretreated gangue coarse aggregate to obtain a first component;

[0146] Step 2: Evenly mix the emulsified asphalt and the coal gangue powder to obtain the second component;

[0147] Step 3: Evenly mix the first component and the second component, add cement and matrix asphalt, and mix evenly to obtain an asphalt mixture with ecological functions.

[0148] The preparation method of the emulsified asphalt comprises the following steps:

[0149] S1. Heating 100 g of base asphalt to 140° C. and keeping the temperature for 40 min to obtain pretreated base asphalt;

[0150] S2, dispersing 5 g of dodecyl ammonium chloride in 50 mL of deionized water, adding 1 mol / L hydrochloric acid solution to adjust the pH to 2.2, to obtain an emulsion;

[0151] S3. Evenly mix the emulsion and the pretreated matrix asphalt, raise the temperature to 100° C., and grind at a speed of 2000 rpm for 1 min to obtain emulsified asphalt.

[0152] The preparation method of the anionic emulsifier modified coal gangue powder comprises the following steps: uniformly mixing 20 g of a mixture of sodium dodecyl sulfate and sodium rosin acid in a mass ratio of 1:1 with 100 g of coal gangue powder with a particle size of 1 mm, and grinding the mixture at 90° C. and a rotation speed of 700 rpm for 2 hours to obtain the anionic emulsifier modified coal gangue powder.

[0153] The particle size of the coal gangue coarse aggregate is 10 mm.

[0154] In order to further demonstrate the technical effect of the present invention, the present invention conducted the following tests on the asphalt mixtures obtained in Examples 1-3 and Comparative Examples 1-5:

[0155] The mixture specimens were prepared according to the Test Code for Asphalt and Asphalt Mixtures in Highway Engineering (JTGE20-2011), and the splitting strength, freeze-thaw splitting strength ratio TSR, dynamic stability (70°C), flexural strain and flexural stiffness modulus of the specimens were tested and calculated.

[0156] Table 1 Evaluation test results of asphalt mixtures obtained from Examples 1-3 and Comparative Examples 1-5

[0157]

[0158] The present invention also tests the ecological function of the asphalt mixture. The soil in the Gobi desert area is spread out to obtain a soil sample. The asphalt mixture is spread out in the middle of the soil sample and left to stand for 2 days. The changes in the surrounding soil before and after the asphalt mixture is laid are tested. The results are shown in Table 2.

[0159] Table 2 Soil change results

[0160]

[0161] It can be seen from Table 1 and Table 2 that the asphalt mixture provided by the present invention not only has excellent mechanical properties, but also can effectively increase the content of elements such as nitrogen, phosphorus and potassium in the soil, effectively improve the problem of soil barrenness, and provide a new idea for the construction of Gobi highways.

[0162] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An asphalt mixture with ecological function, characterized by: The raw material components include the following parts by weight: 1-10 parts of emulsified asphalt, 1-10 parts of cement, 2-15 parts of anionic emulsifier-modified coal gangue powder, 40-50 parts of matrix asphalt, 1-5 parts of microbial liquid and 85-95 parts of coal gangue coarse aggregate; The microbial liquid is a mixed liquid of Burkholderia multivora, Pseudomonas stutzeri and Bacillus megaterium; The preparation method of the emulsified asphalt comprises the following steps: S1. Heating the base asphalt to 130°C-150°C and keeping the temperature to obtain pretreated base asphalt; S2, dispersing the cationic emulsifier in deionized water, adjusting the pH to 2.0-2.5, and obtaining an emulsion; S3. Evenly mix the emulsion and the pretreated matrix asphalt, raise the temperature to 90° C.-120° C., and grind at high speed to obtain emulsified asphalt.

2. The asphalt mixture with ecological function as claimed in claim 1, characterized in that: The ratio of the number of live bacteria of Burkholderia multivora, Pseudomonas stutzeri and Bacillus megaterium in the microbial liquid is 1:0.2:1-1:0.5:1, and the number of live bacteria in the microbial liquid is (1×10 8 )-(1×10 9 )CFU / mL.

3. The asphalt mixture with ecological function as claimed in claim 1 or 2, characterized in that: The deposit number of the Burkholderia polyphaga is BNCC 365307; and / or The deposit number of the Pseudomonas stutzeri is BNCC 367787; and / or The deposit number of the Bacillus megaterium is BNCC 190686.

4. The asphalt mixture with ecological function as claimed in claim 1, characterized in that: In S1, the insulation time is 30 min-50 min; and / or In S2, the cationic emulsifier is any one or two of dodecyl ammonium chloride, hexadecyl trimethyl ammonium bromide or hexadecyl pyridinium bromide; and / or In S2, the mass volume ratio of the cationic emulsifier to deionized water is 1g:10mL-1g:15mL.

5. The asphalt mixture with ecological function as claimed in claim 1, characterized in that: In S3, the mass ratio of the emulsion to the pretreated matrix asphalt is 0.5:1-0.6:1; and / or In S3, the rotation speed of the high-speed grinding is 1800rpm-2000rpm, and the time of the high-speed grinding is 1min-2min.

6. The asphalt mixture with ecological function as claimed in claim 1, characterized in that: The preparation method of the anionic emulsifier-modified coal gangue powder comprises the following steps: uniformly mixing the anionic emulsifier with the coal gangue powder, and grinding the mixture at 85° C.-95° C. to obtain the anionic emulsifier-modified coal gangue powder.

7. The asphalt mixture with ecological function as claimed in claim 6, characterized in that: The mass ratio of the anionic emulsifier to the coal gangue powder is 0.1:1-0.3:1; and / or The anionic emulsifier is sodium dodecyl sulfate and sodium rosin acid in a mass ratio of 1:1-1:1.2; and / or The rotation speed of the grinding process is 600rpm-800rpm, and the time of the grinding process is 1h-3h.

8. The method for preparing an asphalt mixture with ecological function according to any one of claims 1 to 7, characterized in that: The steps include: Step 1, high temperature sterilizing the gangue coarse aggregate at 118° C.-121° C. for 20 min-30 min to obtain pretreated gangue coarse aggregate, and uniformly mixing the microbial liquid with the pretreated gangue coarse aggregate to obtain a first component; Step 2: Evenly mix the emulsified asphalt and the anionic emulsifier-modified coal gangue powder to obtain a second component; Step 3: Evenly mix the first component and the second component, add cement and matrix asphalt, and mix evenly to obtain an asphalt mixture with ecological functions.

9. Use of the asphalt mixture with ecological function as described in any one of claims 1 to 7 or the asphalt mixture with ecological function prepared by the preparation method of the asphalt mixture with ecological function as described in claim 8 in the field of road engineering construction.

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