Intelligent asphalt mixture mixing construction method

Abstract

This application specifically relates to an intelligent asphalt mixture mixing construction method, including the following steps: Step S1: Construction preparation; Step S2: Checking whether the intelligent asphalt mixture mixing equipment meets the start-up conditions; if the start-up conditions are met, proceed to Step S3; Step S3: Loading and conveying aggregates; Step S4: Heating, drying, and lifting; Step S5: Dust removal; Step S6: Screening, metering, and conveying hot aggregates; Step S7: Mixing the mixture; Step S8: Storing the asphalt mixture; Step S9: Loading the asphalt mixture onto trucks. This method improves production efficiency, saves material costs, is energy-saving and environmentally friendly, and can significantly improve the proportioning accuracy of asphalt mixture mixing.

Description

Technical Field

[0001] This application belongs to the field of asphalt mixing technology, specifically relating to an intelligent mixing and construction method for asphalt mixtures. Background Technology

[0002] With the continuous development of infrastructure construction, asphalt mixing plants are widely used in projects such as highways, urban roads, airports, docks, and parking lots. They are the first and most critical piece of equipment in asphalt pavement construction, and their performance directly affects the quality of the asphalt pavement. An asphalt mixing plant is a factory-type complete set of equipment that mixes dried and heated aggregates of different particle sizes, fillers, and asphalt according to a designed mix ratio at a specified temperature to form a homogeneous mixture.

[0003] The existing technology still suffers from insufficient mixing precision of asphalt mixtures. Summary of the Invention

[0004] To address the aforementioned shortcomings in the existing technology, this invention provides an intelligent mixing and construction method for asphalt mixtures, the improvement of which lies in that the method includes the following steps:

[0005] An improved intelligent mixing and construction method for asphalt mixtures includes the following steps:

[0006] Step S1: Construction preparation, including,

[0007] Step S1-1, design the target asphalt mixture mix proportion, including:

[0008] Step S1-1-1: Determine the composition ratio of each type of aggregate used to form the target asphalt mixture;

[0009] Step S1-1-2: Mix the target asphalt mixture using a small laboratory mixer and determine the optimal asphalt-aggregate ratio (OAC) of the target asphalt mixture.

[0010] Step S1-1-3: Test the performance of the target asphalt mixture;

[0011] Step S1-2: Mix the target asphalt mixture using a laboratory mixing machine and obtain the production asphalt mixture;

[0012] Steps S1-3 involve conducting Marshall tests on the produced asphalt mixture to verify the mix proportions, including:

[0013] Step S1-3-1: Take a sample from the hot aggregate bin to obtain the proportion of aggregate and mineral powder used in the production of asphalt mixture, so that the asphalt mixture mix proportion meets the target asphalt mixture mix proportion.

[0014] Step S1-3-2: Determine the optimal asphalt-aggregate ratio for producing asphalt mixtures; if the optimal asphalt-aggregate ratio for producing asphalt mixtures matches the optimal asphalt-aggregate ratio for the target asphalt mixture, proceed to step S1-3-3; if the optimal asphalt-aggregate ratio for producing asphalt mixtures does not match the optimal asphalt-aggregate ratio for the target asphalt mixture, repeat steps S1-3-1 and S1-3-2.

[0015] Step S1-3-3: Inspect the performance of the produced asphalt mixture; if the performance of the produced asphalt mixture is within the design requirements, proceed to step S2: carry out the asphalt mixture mixing construction; if the performance of the produced asphalt mixture is not within the design requirements, repeat steps S1-3-1 to S1-3-3.

[0016] Step S2: Check whether the intelligent asphalt mixing equipment meets the start-up conditions; if the start-up conditions are met, proceed to step S3.

[0017] Step S3: Loading and conveying ore; use a loader to put ore of different specifications into the corresponding cold hopper, and convey the ore to the roller heating drum via belt conveyor;

[0018] Step S4: Heating and drying, lifting the material; adding a drum to dry the ore to form hot aggregate; using an elevator to transport the hot aggregate to a higher position and unload it into a hot aggregate screening machine;

[0019] Step S5: Dust removal; The combustion exhaust gas, water vapor, dust generated in the drum and the dust collected from the main building vibrating screen are settled and filtered to release gases that meet environmental protection requirements.

[0020] Step S6: Screening, metering, and conveying hot aggregates; the control system automatically identifies the type and level of hot aggregates and conveys them to the corresponding silos via belt conveyor.

[0021] Step S7: Mix the mixture to form an asphalt mixture; the mixture includes: hot aggregate, powder, asphalt or modified asphalt;

[0022] Step S7-1: Heat the asphalt or heated modified asphalt, and keep the asphalt or modified asphalt warm.

[0023] Step S7-2: Measure and transport asphalt or modified asphalt;

[0024] Step S7-3: Meter and convey the mineral powder;

[0025] Step S7-4: Stir the mixture;

[0026] Step S8: Store the asphalt mixture;

[0027] Step S9: Load the asphalt mixture onto the truck.

[0028] Preferably, step S1-1-2 involves mixing the target asphalt mixture using a small laboratory mixing plant to determine the optimal asphalt-aggregate ratio (OAC) of the target asphalt mixture, including:

[0029] Step S1-1-2-1: Using the aggregates that constitute the target asphalt mixture, within a preset range of asphalt-aggregate ratio, five different asphalt-aggregate ratios are taken at intervals of 0.5% to prepare five groups of Marshall specimens of the target asphalt mixture.

[0030] Step S1-1-2-2: Obtain the density, stability-flow value, porosity, and asphalt saturation of each group of Marshall specimens.

[0031] Step S1-1-2-3: Select the asphalt-aggregate ratio a1 corresponding to the maximum density; select the asphalt-aggregate ratio a2 corresponding to the maximum stability; select the asphalt-aggregate ratio a3 corresponding to the target void ratio or the median void ratio; select the asphalt-aggregate ratio a4 with the median asphalt saturation. Take the average of the four as the initial value of the optimal asphalt-aggregate ratio OAC1 according to the following formula.

[0032] OAC1 = (a1 + a2 + a3 + a4) / 4;

[0033] Step S1-1-2-4: Obtain the maximum asphalt-aggregate ratio OACmax1 and the minimum asphalt-aggregate ratio OACmin1 that can simultaneously meet the density, stability-flow value, porosity and asphalt saturation standards of the target asphalt mixture, and take the median value OAC2; OAC2=(OACmax1+OACmin1) / 2;

[0034] If OAC1 is outside the range of OACmin1 to OACmax1, repeat steps S1-1-1 to S1-1-2 to adjust the gradation and redesign the mix proportion.

[0035] Step S1-1-2-5, obtain the optimal asphalt-aggregate ratio OAC = (OAC1 + OAC2) / 2 for the target asphalt mixture.

[0036] Preferably, if the asphalt saturation range exceeds the corresponding preset asphalt-aggregate ratio range, the average of the three asphalt-aggregate ratios is calculated as the initial value of the optimal asphalt-aggregate ratio OAC1 using the following formula: OAC1 = (a1 + a2 + a3) / 3.

[0037] Preferably, if the peak value of density or stability appears outside the corresponding preset oil-stone ratio range, then the oil-stone ratio a3 corresponding to the target porosity or the median porosity is taken as OAC1.

[0038] Preferably, step S1-3-2, determining the optimal asphalt-aggregate ratio OACz for producing asphalt mixtures, includes:

[0039] Step S1-3-2-1: Obtain the optimal asphalt-aggregate ratio (OAC) for the target asphalt mixture, as well as three asphalt-aggregate ratios: OAC+0.3% and OAC-0.3%.

[0040] Step S1-3-2-2: Take the asphalt mixture obtained in step S1-3-2-1 and use it to prepare five sets of Marshall specimens for the production of asphalt mixtures for Marshall testing.

[0041] Step S1-3-2-3: Obtain the density, stability-flow value, void ratio, and asphalt saturation of each group of Marshall specimens used to produce asphalt mixtures.

[0042] Steps S1-3-2-4: Select the asphalt-aggregate ratio b1 corresponding to the maximum density of the asphalt mixture; select the asphalt-aggregate ratio b2 corresponding to the maximum stability of the asphalt mixture; select the asphalt-aggregate ratio b3 corresponding to the target void ratio or the median void ratio of the asphalt mixture; select the asphalt-aggregate ratio b4 where the asphalt saturation of the asphalt mixture is the median asphalt saturation. Take the average of the four as the initial value of the optimal asphalt-aggregate ratio OACx for the asphalt mixture as follows: OACx=(b1+b2+b3+b4) / 4.

[0043] Step S1-3-2-5: Obtain the maximum asphalt-aggregate ratio OACmax2 and the minimum asphalt-aggregate ratio OACmin2 of the asphalt mixture that can simultaneously meet the standards for density, stability-flow value, porosity and asphalt saturation of the asphalt mixture. Take the median value to obtain OACy; OACy = (OACmax2 + OACmin2) / 2.

[0044] Step S1-3-2-6, obtain the optimal asphalt-aggregate ratio OACz=(OACx+OACy) / 2 for producing asphalt mixture;

[0045] Step S1-3-2-7: Compare OACz and OAC; if OACz / OAC≤0.2%, proceed to step S2 to carry out asphalt mixture mixing; if OACz / OAC>0.2%, repeat steps S1-3-1 and S1-3-2.

[0046] Preferably, step S3 further includes: the automatic control system controlling the opening of the cold material hopper outlet, the cold material hopper opening, and the ore material conforming to the production gradation being poured onto the belt conveyor according to the preset mixing ratio; the automatic control system controlling the belt speed, and the ore material being transported to the drum for heating via the belt conveyor.

[0047] Preferably, step S4 further includes: controlling the heating temperature of the drum by an automatic control system, wherein the heating temperature of the mineral material is 10°C to 30°C higher than the heating temperature of the asphalt or modified asphalt.

[0048] Preferably, step S5 further includes: dust particles with a diameter ≥ 0.075 mm are separated and collected by a gravity dust collector, while dust particles with a diameter < 0.075 mm are filtered and settled by a bag filter.

[0049] Preferably, step S6 further includes:

[0050] Step S6-1, screening: screening hot aggregates in a hot aggregate screening machine; the hot aggregates are screened into multiple sizes by the screening machine, and each size of hot aggregates falls into the corresponding hot aggregate storage bin for storage.

[0051] Step S6-2, metering; according to the set ratio, each specification of hot aggregate is fed into the stone metering bin in batches in the order of smallest to largest and the total amount is accumulated. The hot aggregate is fed into the hot material storage bin by the automatic control system according to the set ratio.

[0052] Step S6-3: Convey hot aggregate; after weighing, put the hot aggregate into the mixing pot for forced mixing according to the preset sequence.

[0053] Preferably, step S7-2 further includes:

[0054] Step S7-2-1: Determine the temperature of the asphalt or modified asphalt; if the temperature of the asphalt or modified asphalt meets the set value, proceed to step S7-2-2; if the temperature of the asphalt or modified asphalt does not meet the set value, repeat steps S7-1 to S7-2.

[0055] Step S7-2-2: Initial metering of asphalt or modified asphalt; automatic control system controls the motor speed of the asphalt circulation pump;

[0056] Step S7-2-3: Secondary metering of asphalt or modified asphalt; Automatic control system controls the motor speed of asphalt circulation pump;

[0057] Step S7-2-4: When the weight of the asphalt scale reaches the set upper limit or the asphalt scale level switch is triggered, the automatic control system will issue an alarm and automatically shut down the asphalt circulation pump, prohibiting further measurement.

[0058] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0059] The intelligent mixing and construction method for asphalt mixtures involved in this application has been measured to produce asphalt mixtures at a rate of over 420 t / h, which is 10% to 20% higher than the unit capacity of similar equipment, highlighting its high capacity.

[0060] The intelligent mixing and construction method for asphalt mixtures involved in this application provides energy-saving and environmentally friendly combustion technology, high-efficiency medium atomization, and gas stratified combustion. The oil consumption for producing asphalt mixtures is 5.5 kg / t, which can save 15% of heavy oil, lower than the industry average of 6.5 kg / t, highlighting the feature of reducing oil consumption.

[0061] The intelligent mixing and construction method for asphalt mixtures disclosed in this application achieves more precise raw material metering, with an asphalt-aggregate ratio deviation of ≤0.1%, lower than the industry standard of 0.3%. The modified asphalt dosage is controlled by a frequency converter and secondary metering, achieving an asphalt-aggregate ratio deviation of <0.1%; the aggregate dosage is controlled by the feed inlet size gate, combined with pulse vibration and multi-speed adjustment, achieving an aggregate metering deviation of less than 20kg; the powder dosage is controlled by a frequency converter screw and self-adjusting feed weighing drop, achieving a powder metering deviation of less than 1kg.

[0062] The intelligent mixing and construction method for asphalt mixtures involved in this application employs a cold aggregate ventilation and dust removal system and a condensate recovery and reuse system to effectively control the flue gas generated during the production process, ensuring dust emissions are ≤10mg / m³. 3 Asphalt fume emissions ≤10mg / m³ 3 .

[0063] With a high-precision metering and automatic temperature control system, the mixing degree of the mixture in the mixing pot is visible and adjustable. By adopting a brand-new intelligent control system, it achieves four major advantages of digital and intelligent mixing, increasing the mixing efficiency of the asphalt mixing plant by 20%. It realizes data-driven and intelligent management of the entire production process. Attached Figure Description

[0064] Figure 1 This application relates to the intelligent mixing and construction steps of asphalt mixtures;

[0065] Figure 2 This application includes schematic diagrams of the various modules of the automatic control system. Detailed Implementation

[0066] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0067] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0068] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0069] This application relates to an intelligent mixing and construction method for asphalt mixtures, such as... Figure 1 As shown, the process includes the following steps: Step S1: Construction preparation; Step S2: Check whether the intelligent asphalt mixing equipment meets the start-up conditions; if the start-up conditions are met, proceed to Step S3; Step S3: Loading and conveying aggregates; Step S4: Heating, drying, and lifting; Step S5: Dust removal; Step S6: Screening, metering, and conveying hot aggregates; Step S7: Mixing the mixture; Step S8: Storing the asphalt mixture; Step S9: Loading the asphalt mixture onto trucks.

[0070] like Figure 2 As shown, the control system used in the intelligent asphalt mixing equipment involved in this application includes the following modules: a start-up module, a fault detection module, a cold aggregate silo outlet control module, a belt conveyor module, a drum heating module, a hot aggregate identification module, a hot aggregate metering module, a heat transfer oil heating module, a cylinder drive module, a heat transfer oil heating module, a cylinder drive module, an asphalt circulating pump drive module, a powder metering module, a mixing module, a storage module, and a discharge module.

[0071] This application relates to an intelligent mixing and construction method for asphalt mixtures, implemented in conjunction with the above-mentioned modules, including the following specific steps:

[0072] Step S1: Construction preparation, including,

[0073] Step S1-1, design the target asphalt mixture mix proportion, including:

[0074] Step S1-1-1: Determine the composition ratio of each mineral aggregate used in the target asphalt mixture. Specifically, determine the composition ratio of each mineral aggregate. Take various mineral aggregates from the construction site and sieve them. Use a computer or graph to calculate the amount of each mineral aggregate to ensure that the gradation of the synthesized aggregate mixture conforms to the range in Table 1. Repeat the calculation until the aggregate gradation curve is close to a smooth S-curve.

[0075]

[0076]

[0077] Table 1. Gradation range of various asphalt mixtures (%)

[0078] Step S1-1-2 involves mixing the target asphalt mixture using a small laboratory mixing plant to determine the optimal asphalt-aggregate ratio (OAC) of the target asphalt mixture, including:

[0079] Step S1-1-2-1: Using the aggregates that constitute the target asphalt mixture, within a preset range of asphalt-aggregate ratio, five different asphalt-aggregate ratios are taken at intervals of 0.5% to prepare five groups of Marshall specimens of the target asphalt mixture.

[0080] Step S1-1-2-2: Obtain the density, stability-flow value, porosity, and asphalt saturation of each group of Marshall specimens.

[0081] Step S1-1-2-3: Select the asphalt-aggregate ratio a1 corresponding to the maximum density; select the asphalt-aggregate ratio a2 corresponding to the maximum stability; select the asphalt-aggregate ratio a3 corresponding to the target void ratio or the median void ratio; select the asphalt-aggregate ratio a4 with the median asphalt saturation. Take the average of the four as the initial value of the optimal asphalt-aggregate ratio OAC1 according to the following formula.

[0082] OAC1 = (a1 + a2 + a3 + a4) / 4;

[0083] Step S1-1-2-4: Obtain the maximum asphalt-aggregate ratio OACmax1 and the minimum asphalt-aggregate ratio OACmin1 that can simultaneously meet the density, stability-flow value, porosity and asphalt saturation standards of the target asphalt mixture, and take the median value OAC2; OAC2=(OACmax1+OACmin1) / 2;

[0084] If OAC1 is outside the range of OACmin1 to OACmax1, repeat steps S1-1-1 to S1-1-2 to adjust the gradation and redesign the mix proportion.

[0085] Step S1-1-2-5, obtain the optimal asphalt-aggregate ratio OAC = (OAC1 + OAC2) / 2 for the target asphalt mixture.

[0086] Preferably, if the asphalt saturation range exceeds the corresponding preset asphalt-aggregate ratio range, that is, if the preset asphalt-aggregate ratio range fails to include the required range of asphalt saturation, then the average of the three values ​​is calculated as the initial value of the optimal asphalt-aggregate ratio OAC1 according to the following formula: OAC1=(a1+a2+a3) / 3.

[0087] Preferably, if the peak value of density or stability appears outside the corresponding preset oil-stone ratio range, that is, if the density or stability does not have a peak value within the preset oil-stone ratio range (the maximum value is often at both ends of the S-curve), then the oil-stone ratio a3 corresponding to the target porosity is taken as OAC1.

[0088] Specifically, in step S1-1-2-1, using the calculated aggregate composition and the empirically adopted range of asphalt-aggregate ratio, five different preset asphalt-aggregate ratios were selected at 0.5% intervals: OAC0-1.0%, OAC0-0.5%, OAC0, OAC0+0.5%, and OAC0+1.0%. The target asphalt mixture was then mixed using a small laboratory mixer to prepare five groups of Marshall specimens.

[0089] Step S1-1-2-2: Measure the density, void ratio, asphalt saturation, stability, and flow value of the specimen. Plot the curves of each index with the above indicators as the vertical axis and the five different asphalt-aggregate ratios as the horizontal axis.

[0090] Step S1-1-2-3: Take the asphalt a1 corresponding to the maximum density, the asphalt a2 corresponding to the maximum stability, the asphalt a3 corresponding to the target porosity or the median of the target porosity, and the asphalt a4 corresponding to the median of the asphalt saturation range, and take the average of the four as the initial value of the optimal asphalt a1 as OAC1.

[0091] OAC1 = (a1 + a2 + a3 + a4) / 4.

[0092] If the selected preset asphalt-aggregate ratio range fails to cover the required range of asphalt saturation, the average value of the three asphalt-aggregate ratios shall be calculated as OAC1 using the following formula.

[0093] OAC1 = (a1 + a2 + a3) / 3.

[0094] If no density or stability peak occurs within the selected preset oil-aggregate ratio range, the oil-aggregate ratio a3 corresponding to the target porosity or the median of the target porosity can be directly used as OAC1. However, OAC1 must be within the range of OACmax to OACmin; otherwise, the mix design should be redone.

[0095] Step S1-1-2-4: Calculate the maximum asphalt-aggregate ratio OACmax and the minimum asphalt-aggregate ratio OACmin that simultaneously meet all the standards of the target asphalt mixture, and take the median value OAC2. OAC2 = (OACmax + OACmin) / 2.

[0096] Step S1-1-2-5: Take the median value of OAC1 and OAC2 as the optimal asphalt-aggregate ratio OAC for the target mix proportion, and verify its suitability based on regional climate characteristics. The corresponding specimen porosity should be within the design requirements range. If OAC1 is outside the above range, the gradation should be adjusted and the mix proportion design should be redone.

[0097] Step S1-1-3: Test the performance of the target asphalt mixture. Specifically, prepare the target asphalt mixture according to the above mix proportions, and conduct dynamic stability, small beam flexural, immersion Marshall, and freeze-thaw splitting tests. All indicators must meet the requirements of Table 2.

[0098]

[0099] Table 2 Technical Standards for Asphalt Mixtures

[0100] In Table 2, ATB-25, AC-20C, and AC-13C are the asphalt mixture gradations.

[0101] Step S1-2: Mix the target asphalt mixture using a laboratory mixing machine and obtain the production asphalt mixture;

[0102] Steps S1-3 involve conducting Marshall tests on the produced asphalt mixture to verify the mix proportions, including:

[0103] Step S1-3-1: Take a sample from the hot aggregate bin to obtain the proportion of aggregate and mineral powder used in the production of asphalt mixture, so that the asphalt mixture mix proportion meets the target asphalt mixture mix proportion.

[0104] Step S1-3-2: Determine the optimal asphalt-aggregate ratio OACz for producing asphalt mixtures; if the optimal asphalt-aggregate ratio for producing asphalt mixtures matches the optimal asphalt-aggregate ratio for the target asphalt mixture, proceed to step S1-3-3; if the optimal asphalt-aggregate ratio for producing asphalt mixtures does not match the optimal asphalt-aggregate ratio for the target asphalt mixture, repeat steps S1-3-1 and S1-3-2.

[0105] Step S1-3-2, determining the optimal asphalt-aggregate ratio OACz for producing asphalt mixtures, includes:

[0106] Step S1-3-2-1: Take the optimal asphalt-aggregate ratio (OAC) and three asphalt-aggregate ratios: OAC ± 0.3%.

[0107] Step S1-3-2-2: Take the asphalt mixture obtained in step S1-3-2-1 and use it to prepare five sets of Marshall specimens for the production of asphalt mixtures for Marshall testing.

[0108] Step S1-3-2-3: Obtain the density, stability-flow value, void ratio, and asphalt saturation of each group of Marshall specimens used to produce asphalt mixtures.

[0109] Steps S1-3-2-4: Select the asphalt-aggregate ratio b1 corresponding to the maximum density of the asphalt mixture; select the asphalt-aggregate ratio b2 corresponding to the maximum stability of the asphalt mixture; select the asphalt-aggregate ratio b3 corresponding to the target void ratio or the median void ratio of the asphalt mixture; select the asphalt-aggregate ratio b4 where the asphalt saturation of the asphalt mixture is the median asphalt saturation. Take the average of the four as the initial value of the optimal asphalt-aggregate ratio OACx for the asphalt mixture as follows: OACx=(b1+b2+b3+b4) / 4.

[0110] Step S1-3-2-5: Obtain the maximum asphalt-aggregate ratio OACmax2 and the minimum asphalt-aggregate ratio OACmin2 of the asphalt mixture that can simultaneously meet the standards for density, stability-flow value, porosity and asphalt saturation of the asphalt mixture. Take the median value to obtain OACy; OACy = (OACmax2 + OACmin2) / 2.

[0111] Step S1-3-2-6, obtain the optimal asphalt-aggregate ratio OACz=(OACx+OACy) / 2 for producing asphalt mixture;

[0112] Step S1-3-2-7: Compare OACz and OAC; if OACz / OAC≤0.2%, proceed to step S2 to carry out asphalt mixture mixing; if OACz / OAC>0.2%, repeat steps S1-3-1 and S1-3-2.

[0113] Specifically, S1-3, verify the production ratio:

[0114] Step S1-3-1 determines the amount of aggregate and mineral powder used in each hot aggregate bin of the intelligent asphalt mixing plant. Specifically, samples of the aggregate entering each hot aggregate bin after secondary screening in subsequent steps must be taken and screened. Based on the screening results, calculations are performed to ensure that the gradation of the mixed aggregate is close to the target mix proportion and meets the specifications. This determines the proportion of aggregate and mineral powder used in each hot aggregate bin for use in the mixing plant control room. At the same time, the feeding ratio of the cold aggregate bins of the intelligent asphalt mixing plant is repeatedly adjusted to achieve a balanced feeding.

[0115] Step S1-3-2: Determine the optimal asphalt-aggregate ratio OACz for asphalt mixture production: Take the optimal asphalt-aggregate ratio OAC and three ratios (OAC ± 0.3%) from the target mix design. Use the calculated aggregate mixture to prepare asphalt mixtures using a small laboratory mixing plant for Marshall tests. Analyze the results using the target mix design method to obtain OACx and OACy, and then comprehensively determine the optimal asphalt-aggregate ratio OACz for the production mix. The OACz determined by the above method may differ from the optimal asphalt-aggregate ratio OAC of the target mix. If the difference is less than 0.2 percentage points, test specimens should be mixed and paved according to the OAC determined for the production mix, or the asphalt-aggregate ratio for test mixing and paving should be determined through analysis. If the difference exceeds 0.2 percentage points, the cause should be identified, and further testing and analysis should be conducted to determine the optimal asphalt-aggregate ratio for test mixing and paving.

[0116] Step S1-3-3: Inspect the performance of the produced asphalt mixture; if the performance of the produced asphalt mixture is within the design requirements, proceed to step S2: carry out the asphalt mixture mixing construction; if the performance of the produced asphalt mixture is not within the design requirements, repeat steps S1-3-1 to S1-3-3.

[0117] Specifically, asphalt mixtures are prepared according to the mix proportions obtained above, and dynamic stability, beam bending, water immersion Marshall, and freeze-thaw splitting tests are conducted.

[0118] Step S2, check whether the intelligent asphalt mixing plant meets the start-up conditions, including:

[0119] Check whether the intelligent asphalt mixing equipment is in normal operating condition. Specifically, before starting the equipment, staff should inspect the area around the machine to ensure that starting the machine will not cause injury or death. First, inspect all parts of the equipment, focusing on rotating parts, pipeline seals, and electrical wiring to ensure there are no abnormalities. Simultaneously, use the fault detection module of the automatic control system to check whether the raw materials such as sand, gravel, and asphalt are sufficient for production; check whether the fuel oil level is sufficient for production consumption; check whether the heavy oil temperature is heated to a level suitable for the burner; check whether the asphalt temperature meets production requirements; and check that the heavy oil and asphalt pipelines, pumps, and valves are adequately heated and operating normally. If the asphalt pipeline is normal, the asphalt circulation pump can be started to deliver asphalt to the asphalt weighing valve for production. The fault detection module provides feedback on the raw materials, fuel oil level, fuel oil temperature, and the operating status of the pipelines, pumps, and valves. If a fault is detected, the host computer of the automatic control system displays the specific location of the fault so that staff can carry out repairs. If no fault occurs, the start-up module is activated, and the intelligent asphalt mixture mixing equipment is run to step S3.

[0120] Step S3: Loading and conveying ore; using a loader to put ore of different specifications into the corresponding cold hopper, and conveying the ore to the drum heating via a belt conveyor; the cold hopper discharge port control module of the automatic control system controls the opening of the cold hopper discharge port, the cold hopper opens, and the ore that meets the production gradation is poured onto the belt conveyor according to the preset mixing ratio; the belt conveyor module of the automatic control system controls the belt speed, and conveys the ore to the drum heating via the belt conveyor.

[0121] Specifically, a loader is used to shovel sand and gravel of different specifications into the corresponding cold aggregate bins. During the loading process, attention must be paid to the quality of the raw materials to ensure that the quality of the mixed material meets the standard requirements. When loading with the loader, materials are loaded vertically from the bottom in sequence to reduce material segregation.

[0122] The cold storage bins are multiple, each with a capacity of 6×18m. 3 The system uses containers, each containing a different type of mineral. The automatic control system's cold hopper discharge control module controls the opening of the discharge port of each container. The pre-graded minerals, according to a preset mix ratio, are fed onto a belt conveyor after being measured by volume via a belt feeder. The automatic control system's belt conveyor module controls the conveying speed of the belt, which then transports the material to a drying drum. The cold hopper used in this application has a capacity of 6 × 18 m³. 3 Feeding width: 4m; Feeding height: 3.4m; Belt conveyor capacity: 500t / h.

[0123] Step S4: Heating and drying, lifting the material; adding a drum to dry the aggregate to form hot aggregate; using an elevator to transport the hot aggregate to a higher position and unload it into a hot aggregate screening machine. The drum heating module of the automatic control system controls the heating temperature of the drum, wherein the heating temperature of the aggregate is 10℃~30℃ higher than the heating temperature of the asphalt used in the subsequent mixing operation.

[0124] Specifically, the ore conveyed by the feeding belt from the cold hopper enters the drying drum through the feed box. The drum heats the ore to a certain temperature using counter-current heating. The drum heating module of the automatic control system automatically adjusts the burner flame. Due to the rotation of the drum, the ore is repeatedly lifted and dropped by the blades inside the drum, forming a material curtain, which enhances the heat exchange effect. Furthermore, with the help of the drum's inclination angle, the ore moves forward continuously while being heated. After exiting the drum outlet, it is lifted and transported to a higher position by the hot aggregate elevator, along with the coarse powder collected by the gravity dust collector, and unloaded into the hot aggregate screening machine.

[0125] Meanwhile, temperature control is a crucial factor in asphalt mixing. The automatic control system's drum heating module intelligently controls and monitors the temperature of the mixture inside the drum. Specifically, during ignition and feeding: start all fuel supply pumps, open the induced draft fan damper to 10 degrees, and press the ignition button. When the dust collector inlet temperature reaches 60-70℃, open the cold aggregate bin for feeding according to the production mix ratio. The belt conveyor module and drum heating module work together to gradually increase the feeding speed as the drum temperature rises, ensuring the mixture enters the drum quickly and the drum temperature rises rapidly. When the drum temperature reaches 100℃, gradually increase the induced draft fan damper temperature to 40℃. Under normal circumstances, the drum temperature should be maintained between 150-170℃, with the specific temperature depending on climate conditions and transportation distance.

[0126] Step S5: Dust Removal; The combustion exhaust gas, water vapor, dust generated in the drum, and dust collected from the main building's vibrating screen are settled and filtered to produce gases that meet environmental protection requirements. Specifically, the dust removal system functions to settle and filter the combustion exhaust gas, water vapor, dust generated in the drum, and dust collected from the main building's vibrating screen to produce gases that meet environmental protection requirements.

[0127] The high-temperature, dust-laden flue gas discharged from the drum first enters a gravity dust collector for preliminary purification via a primary flue. The collected powder is then conveyed by a screw conveyor to the inlet of the hot aggregate elevator. The dust-laden flue gas then enters a bag filter, and the purified flue gas is directly discharged into the atmosphere by an induced draft fan. The dust recovered by the bag filter is conveyed by a screw conveyor to a recovery powder supply system for storage. Dust particles with a diameter ≥0.075mm are separated and collected by the gravity dust collector, while dust particles with a diameter <0.075mm are filtered and settled by the bag filter.

[0128] The direct-fired flue gas burner has two modes: combustion mode and environmental protection mode. Combustion mode is used for drying mineral materials and also provides flue gas collection and dust collection functions. No additional operation is required to achieve the environmental protection effect outside of normal production operations at the asphalt mixing plant. Environmental protection mode is used for flue gas and dust collection after combustion is stopped. When activating environmental protection mode, the induced draft fan opening needs to be increased to ensure negative pressure. Select the burner mode according to the actual situation.

[0129] The dust removal system operates under negative pressure, and the air pressure and air volume are controlled by adjusting the opening of the induced draft fan damper. Variable frequency technology is also used to control the air volume.

[0130] Step S6: Screening, metering, and conveying hot aggregates; the hot aggregate identification module of the automatic control system identifies the hot aggregate type and hot aggregate level, and conveys the hot aggregates to the corresponding silos via the second belt.

[0131] Step S6-1, screening: screening hot aggregates in a hot aggregate screening machine; the hot aggregates are screened into several specifications by the screening machine, and each specification of hot aggregates falls into the corresponding hot aggregate storage bin for storage.

[0132] Step S6-2, Metering: According to the set proportions, each specification of hot aggregate is fed into the aggregate metering bins in batches, from smallest to largest, for cumulative metering. The hot aggregate metering module of the automatic control system controls the amount of hot aggregate added to the hot aggregate storage bins, and each bin is fed into its respective metering device according to the set proportions. Specifically, based on the asphalt mixture proportions, the hot aggregate is metered using a hot aggregate scale and discharged into the mixer through a discharge gate, which is opened and closed by a cylinder. To accurately display the system's hot aggregate storage, each hot aggregate bin is equipped with a continuous level gauge, which can accurately display the level of each hot aggregate bin through the upper computer monitoring interface used by the automatic control system, so as to make timely adjustments to the aggregate supply rate of the cold aggregate bins in step S3.

[0133] Step S6-3: Convey hot aggregate; after weighing, put the hot aggregate into the mixing pot for forced mixing according to the preset sequence.

[0134] Step S7: Mix the mixture to form an asphalt mixture; the mixture includes: hot aggregate, powder, and asphalt or modified asphalt. The asphalt or modified asphalt mainly serves as a binder, acting as a binder to mix the hot aggregate and powder.

[0135] Modified asphalt can be prepared on-site using either a mixing or blending method.

[0136] Mixing Method: This method is applicable to various modifiers that can be directly and uniformly mixed with asphalt through a mixing process. The mixing method involves directly adding the modifier to hot asphalt and then using vigorous mechanical mixing to mix the modifier particles with the asphalt at high temperatures to prepare modified asphalt with the desired modifier content. The mixing time, temperature, and mixing speed when producing modified asphalt using the mixing method should be determined through experimental research.

[0137] Mixing Method: The mixing method should preferably use high-speed shearing equipment or a colloid mill. The mixing time, temperature, number of passes, and other parameters for producing modified asphalt using the mixing method should be set according to different base asphalts, modifiers, and equipment capabilities. Detailed production processes, operating procedures, and product quality control and inspection methods should be developed before production. Modified asphalt should ideally be used immediately upon production at the construction site; for short-term storage, it should be transferred to storage tanks and continuously stirred or pumped for circulation. During storage, the modified asphalt's effectiveness should not be reduced.

[0138] Step S7-1: Heating and insulating the asphalt or modified asphalt; using heat transfer oil to heat the asphalt or modified asphalt. The heat transfer oil, a heat transfer medium, is placed in a closed circulation system. It absorbs heat released during diesel combustion from the heat transfer oil furnace, raising its temperature. The high-temperature heat transfer oil then heats the asphalt or modified asphalt, as well as the heavy oil, through circulation pipes. After the heat is released, the heat transfer oil is reheated, and the cycle repeats until the asphalt or modified asphalt, and the heavy oil, reach the required temperature.

[0139] The heat transfer oil heating module of the automatic control system uses an automatic burner to heat the heat transfer oil to 180-210℃, and then uses a circulating pump to heat and insulate the asphalt tank, asphalt weighing scale, heavy oil heater, heavy oil tank, asphalt and heavy oil pipelines, etc., to heat the asphalt and heavy oil to the required temperature.

[0140] The heating temperature of asphalt and the production temperature of asphalt mixtures should be selected according to the asphalt type, grade, etc., as specified in Table 3.

[0141]

[0142] Table 3 Production Temperature of Asphalt Mixtures (°C)

[0143] Step S7-2: Metering and conveying asphalt or modified asphalt; according to the mix proportion of the asphalt mixture, the asphalt or modified asphalt is metered by an asphalt scale and discharged into the mixer through the discharge valve. The cylinder drive module of the automatic control system controls the discharge valve driven by the cylinder to realize the opening and closing of the discharge valve.

[0144] Step S7-2-1: Determine the temperature of the asphalt or modified asphalt; if the temperature of the asphalt or modified asphalt meets the set value, proceed to step S7-2-2; if the temperature of the asphalt or modified asphalt does not meet the set value, repeat steps S7-1 to S7-2.

[0145] Step S7-2-2: Initial metering of asphalt or modified asphalt; the asphalt circulation pump drive module of the automatic control system controls the motor speed of the asphalt circulation pump.

[0146] Step S7-2-3: Secondary metering of asphalt or modified asphalt; the asphalt circulation pump drive module of the automatic control system controls the motor speed of the asphalt circulation pump.

[0147] Step S7-2-4: When the weight of the asphalt scale reaches the set upper limit or the asphalt scale level switch is triggered, the automatic control system will issue an alarm and automatically shut down the asphalt circulation pump, prohibiting further measurement.

[0148] Specifically, an asphalt circulation pump controls the circulation of hot asphalt in the pipeline, maintaining a certain temperature and fluidity. When the asphalt temperature falls below the set value on the host computer of the automatic control system, the host computer system will display a low asphalt temperature warning and automatically stop the asphalt circulation pump. During weighing, the metering valve cuts off the circulation loop and opens the metering loop, allowing the asphalt to directly enter the asphalt scale. To achieve accurate metering, the asphalt circulation pump is speed-controlled by the asphalt circulation pump drive module of the automatic control system. During the initial metering, the asphalt circulation pump drive module controls the motor of the asphalt circulation pump to run quickly to accelerate the time it takes for the asphalt to enter the asphalt scale, shortening the batching time. During the secondary metering, the asphalt circulation pump drive module controls the motor of the asphalt circulation pump to run at a low speed, allowing the asphalt to enter slowly and improving metering accuracy. When the weight measured by the asphalt scale reaches the set upper limit or the asphalt scale level switch is triggered, the host computer alarm prompts the asphalt circulation pump drive module to automatically shut down the asphalt circulation pump, prohibiting further metering.

[0149] Step S7-3: Metering and conveying mineral powder; according to the asphalt mixture ratio, the powder metering module of the automatic control system measures the mineral powder and other powders through a powder scale and discharges them into the mixing device through the powder discharge valve. When the weight measured by the powder scale reaches the set upper limit value, the host computer of the automatic control system alarms and automatically closes the mineral powder silo door, prohibiting further metering.

[0150] The automatic control system involved in this application relies on signals detected by various sensors to monitor important parameters such as material ratio, asphalt content, and mixing temperature in real time, thereby ensuring that the quality of the produced mixture meets the user's requirements. The volumetric metering of the aggregate via the belt feeder is an estimated quantity, while the metering of the screened hot aggregate, powder, and hot asphalt is precise. Because of this secondary metering before mixing, it ensures the gradation of the mixture and guarantees a high-precision ratio of hot aggregate, powder, and asphalt. Currently, the static metering accuracy of hot aggregate and powder does not exceed ±0.5%, and the static metering accuracy of asphalt does not exceed ±0.25%. Due to the intermittent mixing, changing the mixture ratio is also convenient, allowing for changes or formula replacements without shutting down the machine.

[0151] Step S7-4: Mixing the asphalt mixture; the asphalt mixture should be mixed evenly, and all aggregates should be completely coated with asphalt binder. The mixing time for each batch in an intermittent mixing plant should be 30-50 seconds, with dry mixing time not less than 5 seconds. Specifically, the hot aggregate metering module, asphalt circulation pump drive module, and powder metering module will mix the hot aggregates, asphalt or modified asphalt, and mineral powder added according to the production mix proportions, and control the mixer to mix evenly through the mixing module. The mixer structure is a twin-shaft type, with the two mixing shafts synchronized by couplings, rotating at equal speeds but in opposite directions. Multiple sets of mixing arms are mounted on the shafts, with wear-resistant blades bolted to the ends of the arms.

[0152] Step S8: Storing Asphalt Mixture; The flip-type finished product silos are placed below the main mixing tower. Finished product mixture and waste materials are directly conveyed into the corresponding storage silos via rotating flip doors controlled by the storage module. The entire conveying channel is sealed, and the doors are cylinder-driven. The silo body is insulated with rock wool boards, and the exterior is fitted with corrugated steel sheets. The storage silos offer advantages such as environmental friendliness, insulation, energy saving, and reliability.

[0153] Step S9: Discharge and Loading. The unloading module controls the unloading gate, and the mixed asphalt mixture is discharged from the bottom unloading gate and loaded into the dump truck.

[0154] The preferred temperature control for the intelligent mixing and construction method of asphalt mixture involved in this application is as follows: the asphalt or modified asphalt is heated to 150-170℃, the aggregate temperature is 10-20℃ higher than the asphalt, the factory temperature of the mixture is 140-155℃, the factory temperature of the finished asphalt mixture directly affects the paving quality and compaction quality, when transported to the paver, the finished temperature of the asphalt mixture is controlled between 135-150℃, the initial compaction temperature is not lower than 135℃, the final compaction temperature is not lower than 110℃, and the temperature when opening to traffic is not higher than 60℃. The temperature of the finished material is monitored at any time during the production process and promptly fed back to the control room to strictly control the temperature.

[0155] Under normal circumstances, the construction temperature should be selected according to the asphalt grade, the type and dosage of the modifier, viscosity, climatic conditions, and the thickness of the pavement layer, within the range specified in Table 4. However, if test sections or construction practice prove that the temperature specified in the table does not conform to the actual situation, appropriate adjustments are permitted.

[0156]

[0157]

[0158] Table 4 Construction Temperature Control Table

[0159] The temperature of asphalt mixture should be measured using an insertion-type digital thermometer with a metal probe; glass thermometers are not permitted. When measuring on a transport vehicle, a small hole should be drilled below the side panel of the truck bed and inserted for at least 15cm to obtain the temperature. The compaction temperature can be measured by drilling holes in the road surface several times using a metal screwdriver.

[0160] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. An intelligent asphalt mixture mixing and construction method, characterized in that, The method includes the following steps: Step S1: Construction preparation, including, Step S1-1, design the target asphalt mixture mix proportion, including: Step S1-1-1: Determine the composition ratio of each mineral aggregate used to constitute the target asphalt mixture; Step S1-1-2: Mix the target asphalt mixture using a small laboratory mixer and determine the optimal asphalt-aggregate ratio (OAC) of the target asphalt mixture; Step S1-1-3: Test the performance of the target asphalt mixture; Steps S1-2: The target asphalt mixture is mixed using a laboratory mixing machine to obtain the production asphalt mixture; Steps S1-3 involve conducting Marshall tests on the produced asphalt mixture to verify its mix proportions, including: Step S1-3-1: Take a sample from the hot aggregate bin to obtain the proportion of aggregate and mineral powder used in the production of asphalt mixture, so that the asphalt mixture ratio meets the target asphalt mixture ratio. Step S1-3-2: Determine the optimal asphalt-aggregate ratio for the asphalt mixture being produced; if the optimal asphalt-aggregate ratio for the asphalt mixture being produced matches the optimal asphalt-aggregate ratio for the target asphalt mixture, proceed to step S1-3-3; if the optimal asphalt-aggregate ratio for the asphalt mixture being produced does not match the optimal asphalt-aggregate ratio for the target asphalt mixture, repeat steps S1-3-1 and S1-3-2. Step S1-3-3: Test the performance of the produced asphalt mixture; if the performance of the produced asphalt mixture is within the design requirements range, proceed to step S2 to carry out asphalt mixture mixing construction; if the performance of the produced asphalt mixture is not within the design requirements range, repeat steps S1-3-1 to S1-3-3. Step S2: Check whether the intelligent asphalt mixing equipment meets the start-up conditions; if the start-up conditions are met, proceed to step S3. Step S3: Loading and conveying ore; using a loader to put ore of different specifications into the corresponding cold hopper, and conveying the ore to the roller heating drum via a belt conveyor; Step S4: Heating and drying, lifting the material; adding the roller to dry the ore to form hot aggregate; using an elevator to transport the hot aggregate to a higher position and unload it into a hot aggregate screening machine; Step S5: Dust removal; The combustion exhaust gas, water vapor, dust generated in the drum, and dust collected from the main building's vibrating screen are settled and filtered to ensure that the emitted gas meets environmental protection requirements; dust emissions are ≤10mg / m³. 3 Asphalt fume emissions ≤10mg / m³ 3 ; Step S6: Screening, metering, and conveying hot aggregates; the automatic control system automatically identifies the hot aggregate type and level, and conveys the hot aggregates to the corresponding silos via belt conveyor. Step S7: Mix the mixture to form an asphalt mixture; the mixture includes: hot aggregate, powder, asphalt or modified asphalt; Step S7-1: Heat the asphalt or heated modified asphalt, and keep the asphalt or modified asphalt warm. Step S7-2: Measure and transport asphalt or modified asphalt; Step S7-3: Measure and transport mineral powder. Step S7-4: Stir the mixture to achieve an asphalt-aggregate ratio deviation of <0.1%; Step S8: Store the asphalt mixture; Step S9: Load the asphalt mixture onto the truck; Step S7-2 further includes: Step S7-2-1: Determine the temperature of the asphalt or modified asphalt; if the temperature of the asphalt or modified asphalt meets the set value, proceed to step S7-2-2; if the temperature of the asphalt or modified asphalt does not meet the set value, repeat steps S7-1 to S7-2. Step S7-2-2: Initial metering of asphalt or modified asphalt; automatic control system controls the motor speed of the asphalt circulation pump; Step S7-2-3: Secondary metering of asphalt or modified asphalt; Automatic control system controls the motor speed of asphalt circulation pump; Step S7-2-4: When the weight of the asphalt scale reaches the set upper limit or the asphalt scale level switch is triggered, the automatic control system will issue an alarm and automatically shut down the asphalt circulation pump to prevent further measurement. Step S1-1-2 involves mixing the target asphalt mixture using a small laboratory mixing planter and determining the optimal asphalt-aggregate ratio (OAC) of the target asphalt mixture, including: Step S1-1-2-1: Using the aggregates constituting the target asphalt mixture, within a preset range of asphalt-aggregate ratio, five different asphalt-aggregate ratios are taken at intervals of 0.5% to prepare five groups of Marshall specimens of the target asphalt mixture. Step S1-1-2-2: Obtain the density, stability-flow value, porosity, and asphalt saturation of each group of Marshall specimens. Step S1-1-2-3: Select the asphalt-aggregate ratio a1 corresponding to the maximum density; select the asphalt-aggregate ratio a2 corresponding to the maximum stability; select the asphalt-aggregate ratio a3 corresponding to the target void ratio or the median void ratio; select the asphalt-aggregate ratio a4 with the median asphalt saturation. Take the average of the four as the initial value of the optimal asphalt-aggregate ratio OAC1 according to the following formula. OAC1 = (a1 + a2 + a3 + a4) / 4; Step S1-1-2-4: Obtain the maximum asphalt-aggregate ratio OACmax1 and the minimum asphalt-aggregate ratio OACmin1 that can simultaneously meet the density, stability-flow value, porosity and asphalt saturation standards of the target asphalt mixture, and take the median value OAC2; OAC2=(OACmax1+OACmin1) / 2. If OAC1 is outside the range of OACmin1 to OACmax1, repeat steps S1-1-1 to S1-1-2 to adjust the gradation and redesign the mix proportion. Step S1-1-2-5: Obtain the optimal asphalt-aggregate ratio OAC = (OAC1 + OAC2) / 2 for the target asphalt mixture.

2. The intelligent asphalt mixture mixing and construction method of claim 1, wherein, If the asphalt saturation range exceeds the corresponding preset asphalt-aggregate ratio range, the average of the three asphalt-aggregate ratios is calculated as the initial value of the optimal asphalt-aggregate ratio OAC1 using the following formula: OAC1 = (a1 + a2 + a3) / 3.

3. The intelligent asphalt mixture mixing and construction method of claim 1, wherein, If the peak value of density or stability appears outside the corresponding preset oil-stone ratio range, then the oil-stone ratio a3 corresponding to the target porosity or the median porosity is taken as OAC1.

4. The intelligent asphalt mixture mixing and construction method of claim 1, wherein, Step S1-3-2, determining the optimal asphalt-aggregate ratio OACz for producing the asphalt mixture, includes: Step S1-3-2-1: Take the optimal asphalt-aggregate ratio OAC, and three asphalt-aggregate ratios: OAC+0.3% and OAC-0.3%. Step S1-3-2-2: Take the asphalt mixture obtained in step S1-3-2-1 and use it to prepare five sets of Marshall specimens for the production of asphalt mixtures for Marshall testing. Step S1-3-2-3: Obtain the density, stability-flow value, void ratio, and asphalt saturation of each group of Marshall specimens used to produce asphalt mixtures. Steps S1-3-2-4: Select the asphalt-aggregate ratio b1 corresponding to the maximum density of the asphalt mixture; select the asphalt-aggregate ratio b2 corresponding to the maximum stability of the asphalt mixture; select the asphalt-aggregate ratio b3 corresponding to the target void ratio or the median void ratio of the asphalt mixture; select the asphalt-aggregate ratio b4 where the asphalt saturation of the asphalt mixture is the median asphalt saturation. Take the average of the four as the initial value of the optimal asphalt-aggregate ratio OACx for the asphalt mixture as follows: OACx = (b1 + b2 + b3 + b4) / 4. Step S1-3-2-5: Obtain the maximum asphalt-aggregate ratio OACmax2 and the minimum asphalt-aggregate ratio OACmin2 of the asphalt mixture that can simultaneously meet the standards for density, stability-flow value, porosity and asphalt saturation of the asphalt mixture. Take the median value to obtain OACy; OACy = (OACmax2 + OACmin2) / 2. Step S1-3-2-6, obtain the optimal asphalt-aggregate ratio OACz = (OACx + OACy) / 2 for the production of the asphalt mixture; Step S1-3-2-7: Compare OACz and OAC; if OACz / OAC≤0.2%, proceed to step S2 to carry out asphalt mixture mixing; if OACz / OAC>0.2%, repeat steps S1-3-1 and S1-3-2.

5. The intelligent asphalt mixture mixing and construction method of claim 1, wherein, Step S3 further includes: the automatic control system controls the opening of the cold material hopper outlet, the cold material hopper opens, and the ore material that meets the production gradation is poured into the belt conveyor according to the preset mixing ratio; the automatic control system controls the belt speed, and the ore material is transported to the drum for heating through the belt conveyor.

6. The intelligent asphalt mixture mixing and construction method of claim 1, wherein, Step S4 further includes: controlling the heating temperature of the drum by an automatic control system, wherein the heating temperature of the mineral material is 10°C to 30°C higher than the heating temperature of the asphalt or modified asphalt.

7. The intelligent asphalt mixture mixing and construction method of claim 1, wherein, Step S5 further includes: dust particles with a diameter ≥ 0.075 mm are separated and collected by a gravity dust collector, while dust particles with a diameter < 0.075 mm are filtered and settled by a bag filter.

8. The intelligent asphalt mixture mixing and construction method of claim 1, wherein, Step S6 further includes: Step S6-1, screening: screening hot aggregates in a hot aggregate screening machine; the hot aggregates are screened into multiple sizes by the screening machine, and each size of hot aggregates falls into the corresponding hot aggregate storage bin for storage. Step S6-2, metering; according to the set ratio, each specification of hot aggregate is fed into the stone metering bin in batches in the order of smallest to largest and the total amount is accumulated. The hot aggregate is fed into the hot material storage bin by the automatic control system according to the set ratio. Step S6-3: Convey hot aggregate; after weighing, put the hot aggregate into the mixing pot for forced mixing according to the preset sequence.

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