A copper-doped tailings road base material, its ratio confirmation method and application

Abstract

The present invention belongs to the technical field of road construction, in particular to a copper tailings-incorporated pavement base material, its proportion confirmation method and application. The present invention comprises the following steps: S1, preparing raw materials; S2, adopting the compaction test method to calculate the void ratio after compaction of the aggregate wrapped with cement mortar; S3, according to the volume filling principle, the gravel forms a basic skeleton, measuring the void ratio in the vibration-compacted state of the gravel, the cement mortar cements the aggregate and fills the voids formed by the gravel skeleton, and finally determining the mixing ratios of copper tailings, gravel and aggregate in combination with the mixture composition mechanism and volume parameters; S4, calculating the dosage of the steel slag composite cementitious material mortar by the ratio of the film thickness of the steel slag composite cementitious material mortar wrapped around the aggregate to the specific surface area of the copper tailings. The present invention adopts the skeleton filling theory method and controls the shrinkage effect of the filler in the skeleton, reducing the cracking risk and having good strength at the same time.

Description

Technical Field

[0001] The present invention belongs to the technical field of road construction, and particularly relates to a copper tailings-incorporated road base material, a method for confirming its proportion, and an application thereof. Background Art

[0002] Copper tailings refer to the solid waste remaining after the beneficiation process of mines mainly engaged in copper ore resources mining, after screening the useful components in the ore. Usually, more than 98% of the components in copper ore become tailings after extraction. With the rapid development of highways, the demand for road construction materials is increasing day by day. The geometric shape and mechanical properties of copper tailings are similar to those of rolled gravel, and they can replace natural aggregates. Applying tailings to road materials is a good trend for waste utilization and environmental protection.

[0003] Most of the road bases of existing high-grade highways adopt semi-rigid bases. The semi-rigid base materials require high early strength, good plate body property, and strong stress diffusion ability. Affected by the cement hydration heat reaction, the problem of shrinkage cracking failure of semi-rigid base materials has been difficult to solve. Among them, in semi-rigid base materials, the finer the material, the larger its specific surface area, and the more cement mortar required to coat its surface. However, this is more likely to cause shrinkage cracking. Therefore, there is an urgent need for a copper tailings-incorporated road base material, a method for confirming its proportion, and an application to solve the above problems. Summary of the Invention

[0004] To overcome the defects in the above-mentioned prior art, the present invention provides a copper tailings-incorporated road base material, a method for confirming its proportion, and an application thereof. The present invention adopts the skeleton filling theory method, and through the thickness of the mortar film and the selection of cementitious materials, controls the shrinkage effect after the fine materials used for filling in the skeleton act with the cementitious materials, thereby reducing the cracking risk and having good strength at the same time.

[0005] To achieve one of the above purposes, the present invention provides the following steps:

[0006] S1. Prepare raw materials: cement mortar, copper tailings, gravel with a size of 26.5 - 37.5 mm, aggregate with a size of 0 - 5 mm, aggregate with a size of 5 - 10 mm, and a composite cementitious material mortar of steel slag;

[0007] S2. Screen the aggregate with a size of 0 - 5 mm and the aggregate with a size of 5 - 10 mm, conduct gradation synthesis according to the requirements of the gradation range, and determine the proportion of the aggregate with a size of 0 - 5 mm and the aggregate with a size of 5 - 10 mm; then calculate the amount of cement mortar according to the thickness of the cement mortar film, the specific surface area of the aggregate with a size of 0 - 5 mm, and the specific surface area of the aggregate with a size of 5 - 10 mm; then adopt the compaction test method to calculate the void ratio after compaction of the aggregate with a size of 0 - 5 mm and the aggregate with a size of 5 - 10 mm coated with cement mortar;

[0008] S3. According to the volume filling principle, the 26.5 - 37.5 mm crushed stones form the basic skeleton, and the void ratio of the 26.5 - 37.5 mm crushed stones in the compacted state is measured; the cement mortar cements the 0 - 5 mm aggregate and the 5 - 10 mm aggregate, and fills the voids in the skeleton formed by the 26.5 - 37.5 mm crushed stones. Finally, the copper tailings filled with the iron slag composite gel material are filled in the remaining voids. The voids after the copper tailings are filled are the designed void ratio of the pavement base material with copper tailings. The mixing ratios of copper tailings, 26.5 - 37.5 mm crushed stones, 0 - 5 mm aggregate, and 5 - 10 mm aggregate are determined in combination with the mixture composition mechanism and volume parameters;

[0009] S4. Calculate the dosage of the steel slag composite cementitious material mortar through the thickness of the steel slag composite cementitious material mortar film and the specific surface area of the copper tailings.

[0010] Preferably, the dosage and void ratio of the cement mortar in step S2 are calculated according to the following formulas respectively:

[0011] ;

[0012] ;

[0013] ;

[0014] ;

[0015] In the formula:

[0016] S —— Specific surface area of the aggregate, m 2 / kg;

[0017] a—— Passing rate of the aggregate through the 4.75 mm sieve hole;

[0018] b—— Passing rate of the aggregate through the 2.36 mm sieve hole;

[0019] c—— Passing rate of the aggregate through the 1.18 mm sieve hole;

[0020] d—— Passing rate of the aggregate through the 0.6 mm sieve hole;

[0021] e—— Passing rate of the aggregate through the 0.3 mm sieve hole;

[0022] f—— Passing rate of the aggregate through the 0.15 mm sieve hole;

[0023] g—— Passing rate of the aggregate through the 0.075 mm sieve hole;

[0024] K sj —— Proportion of the cement mortar used during the compaction test, %;

[0025] K 0~5 —— When the aggregate is proportioned and synthesized, the proportion of the aggregate with a particle size of 0 - 5 mm, %;

[0026] S 0~5 —— The specific surface area of the aggregate with a particle size of 0 - 5 mm, m 2 / kg;

[0027] S 5~10 —— The specific surface area of the aggregate with a particle size of 5 - 10 mm, m 2 / kg;

[0028] u sj —— The thickness of the cement mortar film, μm;

[0029] ρ sj —— The density of the cement mortar, g / cm 3 ;

[0030] ρ hc —— The combined density of the cement mortar coating the 0 - 5 mm aggregate and the 5 - 10 mm aggregate, g / cm 3 ;

[0031] ρ 0~5 —— The apparent density of the aggregate with a particle size of 0 - 5 mm, g / cm 3 ;

[0032] ρ 5~10 —— The apparent density of the aggregate with a particle size of 5 - 10 mm, g / cm 3 ;

[0033] ρ js —— The compacted density of the cement mortar coating the 0 - 5 mm aggregate and the 5 - 10 mm aggregate, g / cm 3 ;

[0034] VC —— The void ratio after compaction of the cement mortar coating the 0 - 5 mm aggregate and the 5 - 10 mm aggregate, %.

[0035] Preferably, the mixing ratios of copper tailings, 26.5 - 37.5 mm crushed stones, 0 - 5 mm aggregates, and 5 - 10 mm aggregates are calculated respectively according to the following formulas:

[0036] ;

[0037] ;

[0038] ;

[0039] ;

[0040] In the formula:

[0041] VCA ——Void ratio after compaction of 26.5 - 37.5 mm crushed stones, %;

[0042] ρ d ——Compaction density of 26.5 - 37.5 mm crushed stones, g / cm 3 ;

[0043] ρ g ——Apparent density of 26.5 - 37.5 mm crushed stones, g / cm 3 ;

[0044] V d ——Volume of 26.5 - 37.5 mm crushed stones in 1 m 3 road pavement base course material, m 3 ;

[0045] V 0~5 ——Volume of 0 - 5 mm aggregates in 1 m 3 road pavement base course material, m 3 ;

[0046] V 5~10 ——Volume of 5 - 10 mm aggregates in 1 m 3 road pavement base course material, m 3 ;

[0047] V w ——Volume of copper tailings in 1 m 3 road pavement base course material, m 3 ;

[0048] V sj ——Volume of cement mortar in 1 m 3 road pavement base course material, m 3 ;

[0049] V gj ——Volume of steel slag composite cementitious material mortar in 1 m 3 road pavement base course material, m 3 ;

[0050] VV—— Design void ratio of the copper-tailings incorporated pavement base course material, %.

[0051] Preferably, the dosage of the steel slag composite cementitious material mortar is calculated according to the following formula:

[0052] ;

[0053] ;

[0054] In the formula:

[0055] r —— Average particle size of copper tailings, mm;

[0056] ri —— Sieve aperture size, mm;

[0057] r i+1 —— Sieve aperture size of the previous grade of the i-th grade, mm;

[0058] Q i —— Screen residue of copper tailings on the sieve %,;

[0059] V gj —— Volume of the steel slag composite cementitious material mortar in 1 m 3 Pavement base course material, m 3 ;

[0060] V w —— Volume of copper tailings in 1 m 3 Pavement base course material, m 3 ;

[0061] —— Thickness of the steel slag composite cementitious material mortar film, mm.

[0062] Preferably, the design void ratio of the copper-tailings incorporated pavement base course material is 2-5%.

[0063] Preferably, the water-binder ratio of the cement mortar is 0.4-0.6, and the thickness of the cement mortar film is 15-20 μm.

[0064] Preferably, the water-binder ratio of the iron slag composite gel material mortar in the copper-tailings incorporated pavement base course material is 0.35-0.55, and the thickness of the iron slag composite gel material mortar film is 0.006-0.01 mm.

[0065] To achieve the second above-mentioned object, the present invention provides a pavement base course material obtained by a method for confirming the proportion of a copper-tailings incorporated pavement base course material. This material includes cement mortar, copper tailings, crushed stones of 26.5-37.5 mm, aggregates of 0-5 mm, aggregates of 5-10 mm, and steel slag composite cementitious material mortar.

[0066] To achieve the third of the above-mentioned purposes, the present invention provides an application of a copper-doped tailings road base material, including the following steps:

[0067] (1) Determine the ratio of the copper-doped tailings road base material and prepare the copper-doped tailings road base material;

[0068] (2) Sprinkle water on the surface of the 26.5 - 37.5 mm crushed stones until they are in a wet state, and use a paver to pave the 26.5 - 37.5 mm crushed stones;

[0069] (3) At the mixing plant, mix the cement mortar with the 0 - 5 mm aggregates and 5 - 10 mm aggregates to complete the preparation of Filler I. Determine the paving thickness of the filler according to the design ratio and the paving thickness of the 26.5 - 37.5 mm crushed stones, and use an excavator in cooperation with manual paving;

[0070] (4) At the mixing plant, mix the copper tailings with the steel slag composite cementitious material mortar to complete the preparation of Filler II, and determine the paving thickness of Filler II according to the design ratio and the paving thickness of the 26.5 - 37.5 mm crushed stones, and use an excavator in cooperation with manual paving;

[0071] (5) Use the road mixing equipment to turn and mix the graded crushed stones, Filler I, and Filler II for 1 - 2 times;

[0072] (6) Use a vibratory roller to vibrate and roll for 4 - 6 times, and then use a rubber-tyred roller to statically roll for 2 - 3 times.

[0073] Preferably, the tonnage of the vibratory roller > 22t.

[0074] The advantages of the present invention are as follows:

[0075] (1) The present invention uses large-sized crushed stones as the basic skeleton, then uses cement mortar to bond the crushed stones and fill them in the voids of the graded crushed stone skeleton, and then uses the iron slag composite gel material to bond the copper tailings and fill them in the remaining voids. This method adopts the principle of volume-by-volume filling, controls the proportion of each raw material, uses different types of binders to bond the copper tailings and crushed stones, and controls the binder dosage by the film thickness of the crushed stones and copper tailings, reducing the influence of the shrinkage effect, thereby reducing the cracking risk, and the road base material has good strength.

[0076] (2) The present invention accurately calculates the binder dosage through the film formation angle of the crushed stones and copper tailings, gives full play to the best effect of the mortar material, while avoiding the shrinkage effect caused by excessive dosage of the mortar material, and further reducing the material cost.

[0077] (3) The present invention uses different types of cementitious materials to cement copper tailings and crushed stones. Cement mortar is used to cement the crushed stones, so that the crushed stones have a high bonding strength, and the contact surface area of the copper tailings is larger, making it easier to shrink. A steel slag composite cementitious material mortar with low heat of hydration is used to cement the copper tailings, reducing the surface shrinkage effect of the copper tailings and effectively reducing the risk of crack generation. Specific Embodiments

[0078] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the following further details the present invention in conjunction with embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Embodiment

[0079] (1) Determine the mix ratio of the pavement base material mixed with copper tailings:

[0080] The pavement base material mixed with copper tailings includes: cement mortar, copper tailings, crushed stones of 26.5 - 37.5 mm, aggregates of 0 - 5 mm, aggregates of 5 - 10 mm, and steel slag composite cementitious material mortar. The copper tailings, aggregates of 0 - 5 mm, and aggregates of 5 - 10 mm are screened, and the results are shown in Table 1 below:

[0081] Table 1 Screening Results of Raw Materials

[0082]

[0083] Table 2 Densities of Raw Materials

[0084]

[0085] According to the grading range requirements of the specification, the aggregate grading is synthesized, and according to the grading range specified in the specification, the mixing ratios of each grade of aggregates are determined as shown in Table 3 below:

[0086] Table 3

[0087]

[0088] Calculate the specific surface areas of the aggregates of 0 - 5 mm and 5 - 10 mm according to the following formula:

[0089] = 2.18 kg / m 2 ;

[0090] = 10.12 kg / m 2 ;

[0091] ;

[0092] The thickness of the cement mortar film is taken as 18 μm, and the amount of cement mortar is calculated according to the following formula:

[0093] = 11.9%;

[0094] ;

[0095] 30% of the aggregate with a size of 0 - 5 mm, 70% of the aggregate with a size of 5 - 10 mm, and 13.4% of the cement mortar are subjected to a compaction test to determine their compaction density g / cm 3 , and the void ratio of the aggregate with a size of 5 - 10 mm and 0 - 5 mm coated with cement mortar after compaction is calculated according to the following formula: = 2.586 g / cm 3 ;

[0096] = 32%;

[0097] According to the volume filling principle, the gravel with a size of 26.5 - 37.5 mm forms the basic skeleton, and the density of the gravel with a size of 26.5 - 37.5 mm in the vibrated and compacted state is measured g / cm 3 , and the void ratio is calculated as follows:

[0098] = 45.4%;

[0099] The aggregate with a size of 0 - 5 mm and 5 - 10 mm is coated with cement mortar and filled in the voids of the skeleton. Finally, the copper tailings are filled in the remaining voids by the iron slag composite gel material mortar. The voids after the copper tailings are filled are the designed void ratio of the road base material mixed with copper tailings, which is taken as 3%. Combining the mixture composition mechanism and volume parameters, the mixing ratios of copper tailings, gravel with a size of 26.5 - 37.5 mm, aggregate with a size of 0 - 5 mm, and aggregate with a size of 5 - 10 mm are calculated according to the following formula.

[0100] ;

[0101] ;

[0102] ;

[0103] The thickness of the iron slag composite cementitious material mortar film is taken as 0.008 mm. According to the screening results of copper tailings, the amount of iron slag composite cementitious material mortar is calculated according to the following formula:

[0104] 0.187 mm;

[0105] = 0.279 ;

[0106] By solving the above equations simultaneously and through calculation, for 1 m 3 in the copper tailings-incorporated road base material, the dosage of gravel with a particle size of 26.5 - 37.5 mm is 0.546 m 3 , the dosage of aggregate with a particle size of 0 - 5 mm is 0.081 m 3 , the dosage of aggregate with a particle size of 5 - 10 mm is 0.19 m 3 , the dosage of cement mortar is 0.036 m 3 , the dosage of copper tailings is 0.09 m 3 , and the dosage of the steel slag composite cementitious material mortar is 0.025 m 3 .

[0107] According to the above mix ratio, for the aggregate with a particle size of 0 - 5 mm, the aggregate with a particle size of 5 - 10 mm, and the cement mortar, they are mixed to prepare Filler I. The water-binder ratio of the cement mortar is taken as 0.5. And for the copper tailings and the steel slag composite cementitious material mortar, they are mixed to prepare Filler II. The water-binder ratio of the steel slag composite cementitious material mortar is taken as 0.45. The results of the 7-day unconfined compressive strength test are shown in Table 4 below:

[0108] Table 4 Detection Results of the 7-day Unconfined Compressive Strength of the Filler (MPa)

[0109]

[0110] As can be seen from Table 4, the experimental results of the present invention meet the specification requirements.

[0111] (2) The construction steps of the copper tailings-incorporated road base material are as follows:

[0112] 1) The designed thickness is taken as 20 cm, and the loose paving coefficient is 1.3. First, sprinkle water on the gravel with a particle size of 26.5 - 37.5 mm until the surface is in a wet state, and use a paver to pave the gravel with a particle size of 26.5 - 37.5 mm.

[0113] 2) At the mixing plant, according to the results of the mix ratio design, mix the cement mortar with the aggregate with a particle size of 5 - 10 mm and the aggregate with a particle size of 0 - 5 mm to complete the preparation of Filler I. According to the paving of the gravel with a particle size of 26.5 - 37.5 mm, the thickness is 20 × 1.3 = 26 cm. Determine the paving thickness of Filler I: 26 × 0.308 / 0.546 = 14.7 cm, and use an excavator in cooperation with manual paving.

[0114] 3) According to the results of the mix ratio design, at the mixing plant, mix the copper tailings with the steel slag composite cementitious material mortar to complete the preparation of Filler II, and pave it on the gravel with a particle size of 26.5 - 37.5 mm. The thickness is 26 cm. Determine the paving thickness of Filler II: 26 × 0.115 / 0.546 = 5.5 cm, and use an excavator in cooperation with manual paving.

[0115] 4) The road mixing equipment used mixes the crushed stones with particle sizes and Fillers I and II once.

[0116] 5) Use a 25t vibrating roller to vibrate and roll 5 times, and a pneumatic tired roller to statically roll 2 times.

[0117] After the construction is completed, curing is carried out, and cores are taken to measure its compactness and strength, meeting the requirements for the base course of heavy traffic on expressways and first-class highways. The results are shown in Table 5 below:

[0118] Table 5 Test Results of the Subgrade Materials Mixed with Copper Tailings after Construction

[0119]

[0120] It can be seen from Table 5 that the subgrade materials mixed with copper tailings prepared by the present invention meet the specification requirements.

[0121] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for confirming the proportion of copper-doped tailings road base material, characterized in that: The steps include: S1. Prepare raw materials: cement mortar, copper tailings, 26.5-37.5 mm crushed stone, 0-5 mm aggregate, 5-10 mm aggregate and steel slag composite cementitious material mortar; S2. Screen the aggregates of 0~5mm and 5~10mm, and mix them according to the grading range requirements to determine the ratio of 0~5mm aggregates to 5~10mm aggregates; then calculate the amount of cement mortar based on the thickness of the cement mortar film, the specific surface area of ​​0~5mm aggregates and the specific surface area of ​​5~10mm aggregates; then use the compaction test method to calculate the void ratio of the aggregates of 0~5mm and 5~10mm wrapped with cement mortar after compaction; the amount of cement mortar and the void ratio are calculated according to the following formulas: ； ； ； ； Where: S ——Specific surface area of ​​aggregate, m 2 / kg; a——the passing rate of aggregate on the 4.75mm sieve; b——the passing rate of aggregate on the 2.36mm sieve; c – the passing rate of aggregates through a 1.18 mm sieve; d——the passing rate of aggregate in 0.6mm sieve hole; e——the passing rate of aggregate in 0.3mm sieve hole; f——the passing rate of aggregate in 0.15mm sieve hole; g——the passing rate of aggregate in the 0.075mm sieve; K sj ——The proportion of cement mortar used in compaction test, %; K 0~5 ——When aggregates are graded, the proportion of aggregates with a diameter of 0 to 5 mm is %; S 0~5 ——Specific surface area of ​​aggregate with a diameter of 0 to 5 mm, m 2 / kg; S 5~10 ——Specific surface area of ​​aggregates 5 to 10 mm, m 2 / kg; u sj ——Thickness of cement mortar film, μm; ρ sj ——density of cement mortar, g / cm 3 ; ρ hc ——Combined density of 0-5mm aggregate and 5-10mm aggregate wrapped with cement mortar, g / cm 3 ; ρ 0~5 ——Apparent density of aggregate with particle size of 0 to 5 mm, g / cm 3 ; ρ 5~10 ——Apparent density of aggregate with particle size of 5 to 10 mm, g / cm 3 ; ρ js ——Compacted density of 0-5mm aggregate and 5-10mm aggregate wrapped with cement mortar, g / cm 3 ; VC ——Porosity of aggregates with a diameter of 0 to 5 mm and aggregates with a diameter of 5 to 10 mm wrapped with cement mortar after compaction, %; S3. According to the volume filling principle, crushed stones of 26.5~37.5mm form the basic skeleton, and the porosity of crushed stones of 26.5~37.5mm under vibration is measured; cement mortar is used to bond aggregates of 0~5mm and aggregates of 5~10mm, and then filled into the voids of the skeleton formed by crushed stones of 26.5~37.5mm. Finally, copper tailings are bonded by iron slag composite gel material and filled into the remaining voids. The voids after copper tailings filling are the designed porosity of the copper tailings-added road base material. The blending ratio of copper tailings, crushed stones of 26.5~37.5mm, aggregates of 0~5mm and aggregates of 5~10mm is determined in combination with the composition mechanism and volume parameters of the mixture. The blending ratio formula is as follows: ； ； ； ； Where: VCA ——Porosity of 26.5~37.5mm crushed stone after compaction, %; ρ d ——Vibrated density of crushed stone with a diameter of 26.5~37.5 mm, g / cm 3 ; ρ g ——Apparent density of crushed stone with a diameter of 26.5-37.5 mm, g / cm 3 ; V d ——1m 3 The volume of 26.5~37.5mm crushed stone in the road base material, m 3 ; V 0~5 ——1m 3 The volume of 0~5mm aggregate in the pavement base material, m 3 ; V 5~10 ——1m 3 The volume of 5-10 mm aggregate in the pavement base material, m 3 ; V w ——1m 3 Volume of copper tailings in pavement base material, m 3 ; V sj ——1m 3 Volume of cement paste in pavement base material, m 3 ; V gj ——1m 3 Volume of steel slag composite cementitious material mortar in pavement base material, m 3 ; VV ——Designed void ratio of copper tailings-mixed pavement base material, %; S4. Calculate the amount of the steel slag composite cementitious material mortar by the thickness of the steel slag composite cementitious material mortar film and the specific surface area of ​​the copper tailings. The calculation formula is as follows: ； ； Where: r——average particle size of copper tailings, mm; ri——sieve hole size, mm; r i+1 ——Size of the sieve hole of the previous sieve of the i-th sieve, mm; Q i ——Copper tailings in the sieve hole The sieve residue, % V gj ——1m 3 Volume of steel slag composite cementitious material mortar in the pavement base material, m 3 ; V w ——1m 3 Volume of copper tailings in pavement base material, m 3 ; ——Thickness of steel slag composite cementitious material mortar film, mm.

2. The method for confirming the proportion of a copper-doped tailings road base material according to claim 1, characterized in that: The copper-doped tailings pavement base material has a designed void ratio of 2-5%.

3. The method for confirming the proportion of a copper-doped tailings road base material according to claim 1, characterized in that: The water-to-cement ratio in the cement mortar is 0.4-0.6, and the cement mortar film thickness is 15-20 um.

4. The method for confirming the proportion of a copper-doped tailings road base material according to claim 1, characterized in that: The water-to-cement ratio of the iron slag composite gel material mortar in the copper tailings-doped pavement base material is 0.35~0.55, and the thickness of the iron slag composite gel material mortar film is 0.006~0.01mm.

5. The pavement base material obtained by the method for confirming the proportion of a copper-doped tailings pavement base material according to any one of claims 1 to 4, characterized in that: The material includes cement mortar, copper tailings, crushed stones of 26.5-37.5 mm, aggregates of 0-5 mm, aggregates of 5-10 mm and steel slag composite cementitious material mortar.

6. Application of the road base material obtained by the method for determining the proportion of a road base material containing copper tailings as claimed in claim 5, characterized in that: The steps include: (1) Determine the proportion of copper-doped tailings pavement base material and prepare the copper-doped tailings pavement base material; (2) Sprinkle water on the 26.5-37.5 mm gravel until the surface is moist, and use a paver to spread the 26.5-37.5 mm gravel; (3) At the mixing station, mix cement mortar with 0-5 mm aggregate and 5-10 mm aggregate to prepare filler I. According to the designed mix ratio and the crushed stone paving thickness of 26.5-37.5 mm, determine the paving thickness of the filler, and use an excavator in combination with manual paving; (4) The copper tailings and the steel slag composite cementitious material mortar are mixed at the mixing station to prepare filler II. The paving thickness of filler II is determined according to the designed proportion and the crushed stone paving thickness of 26.5-37.5 mm, and an excavator is used in combination with manual paving; (5) The road mixing equipment used is used to mix the crushed stone with filler material I and filler material II 1 to 2 times; (6) Use a vibratory roller to vibrate and roll the surface 4 to 6 times, and then use a rubber-wheel roller to roll the surface 2 to 3 times.

7. Application of the road base material obtained by the method for determining the proportion of a road base material containing copper tailings according to claim 6, characterized in that: The tonnage of the vibratory roller is greater than 22t.

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