Method for preparing road base material by cooperation of ternary solid waste cementing material and waste stone powder

Abstract

The invention belongs to the field of preparation of road base materials, and relates to a method for preparing a road base material from a ternary solid waste cementing material and waste stone powder, which comprises the following steps: mixing fly ash, slag and carbide slag according to a mass ratio of (1-2): (4-5): (4-5) to form an FKD cementing material; uniformly mixing the dried waste stone powder with an FKD cementing material and water according to a water-cement ratio of 1.0; wherein the doping ratio of the FKD cementing material is 5%-30%; the uniformly stirred mixture is divided into three layers to be filled into a test mold, each layer is tamped, and the surface layer is subjected to chiseling treatment after each time of tamping; and putting the sample into a standard curing box, curing for 24 hours, demolding, and continuously curing to a set age. The strength of the prepared road base material is higher than that of a cement road base material of the same age, the utilization rate of the waste stone powder and the industrial waste residues is increased, the cost is reduced, and the road base material is environmentally friendly and conforms to the green development concept.

Description

Technical Field

[0001] The present invention belongs to the field of road base material preparation, relates to the treatment and resource utilization of solid waste, and specifically relates to a method for preparing road base material by using ternary solid waste cementitious materials in conjunction with waste stone powder. Background Art

[0002] With the mining and processing of stone, a large amount of waste stone powder is also produced. Waste stone powder is the debris and sawdust produced in the process of cutting, edging, surface treatment or grinding and polishing of stone, and is concentrated in the form of slurry after the water spraying process during the production process. After years of accumulation, the amount of waste stone powder continues to increase, and eventually forms a waste rock mountain. With the continuous increase in the total amount of waste rock mountain, its land area is also expanding, occupying a large area of ​​urban land, seriously affecting urban planning and economic development. Similar to it are calcium carbide slag, blast furnace slag powder and fly ash, which have large output but low utilization rate. The stacking process of calcium carbide slag, blast furnace slag and fly ash also has ecological and environmental problems.

[0003] With the rapid development of the national economy, the construction of expressways will be a key project in my country's development. The base layer is the load-bearing layer of the entire road, which plays a role in stabilizing the road surface and is an indispensable part of the construction of expressways and other roads. Therefore, a large amount of road base materials will be used in the construction of the future transportation infrastructure industry.

[0004] Based on this, and also in order to explore ways to utilize waste rock powder as a resource and realize the transformation from waste to resources, the present invention combines solid waste resources with waste rock powder and applies them to road engineering. It not only improves the utilization rate of waste rock powder and industrial waste slag and achieves the purpose of "treating waste with waste", but also can reduce the use of traditional cementitious material cement, which is in line with my country's current green development concept. Summary of the invention

[0005] The present invention aims to solve the problem in the prior art that solid wastes such as waste rock powder are difficult to treat and reuse, and proposes a method for preparing road base materials by combining a ternary solid waste cementitious material with waste rock powder. The waste rock powder is used as a road base filling material, and its mechanical properties are enhanced by adding a ternary solid waste cementitious material composed of fly ash, slag, and carbide slag.

[0006] The technical solution of the present invention is:

[0007] The present invention provides a method for preparing a road base material by using a ternary solid waste cementitious material in conjunction with waste stone powder, comprising the following steps:

[0008] (1) mixing fly ash, slag and carbide slag in a mass ratio of (1-2):(4-5):(4-5) to obtain a solid waste cementitious material, namely, a FKD cementitious material;

[0009] The above mass ratio is any ratio within the range of (1-2):(4-5):(4-5), for example, it can be 1:4:4, 1:5:4, 1:4:5, 1:5:5, 2:4:4, 2:4:5 or 2:5:4, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0010] When the above components are mixed, water can be added at a water-cement ratio of 1.0, similar to the mixing of cement, adding water to develop strength.

[0011] (2) Mix the dried waste rock powder with FKD cementitious material and water at a water-cement ratio of 1.0 and stir evenly; wherein the mixing ratio of FKD cementitious material is 5% to 30%;

[0012] Here the water-cement ratio is 1.0, that is, the mass ratio of water to the mixture of FKD cementitious material and waste rock powder is 1.0.

[0013] The above-mentioned incorporation ratio is any ratio within the range of 5% to 30%, for example, it can be 5%, 7%, 10%, 12%, 15%, 18%, 20%, 23%, 25%, 28% or 30%, etc., but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0014] (3) The uniformly stirred mixture is filled into the test mold in three layers, each layer is compacted, and the surface is roughened after each round of compaction;

[0015] (4) Place the sample in a standard curing box with a relative humidity of 95% and a temperature of 20°C, remove the sample from the mold after curing for 24 hours, and continue curing until the set age.

[0016] Furthermore, the mass ratio of the fly ash, slag and carbide slag is 1:5:4.

[0017] Furthermore, the mixing ratio of the FKD gelling material is the mass ratio of the FKD gelling material to the waste rock powder, and the mixing ratio is 15% to 20%. Preferably, the mixing ratio is 20%.

[0018] Furthermore, the set age is 15 to 30 days.

[0019] Furthermore, the set age is 28 days.

[0020] Furthermore, the particle size of the waste rock powder is 0.0001-4.75 mm, of which the waste rock powder with a particle size of 0.075-4.75 mm accounts for 26.2%, the particle size of 0.005-0.075 mm accounts for 54.9%, and the particle size of less than 0.005 mm accounts for 18.9%;

[0021] The waste rock powder has an unevenness coefficient of 85 and a curvature coefficient of 0.42.

[0022] Furthermore, the mass content of CaO in the fly ash is 6.60%, the mass content of Al2O3 is 12.66%, the mass content of SiO2 is 61.29%, the mass content of MgO is 0.02%, the mass content of Fe2O3 is 4.48%, the mass content of Na2O is 3.75%, and the mass content of SO3 is 0.66%.

[0023] Furthermore, the slag is granulated blast furnace slag, which contains CaO with a mass content of 41.17%, Al2O3 with a mass content of 13.61%, SiO2 with a mass content of 29.47%, MgO with a mass content of 8.04%, Fe2O3 with a mass content of 0.425%, Na2O with a mass content of 0.676%, and SO3 with a mass content of 4.90%.

[0024] Furthermore, the mass content of CaO in the carbide slag is 67.9%, the mass content of Al2O3 is 1.76%, the mass content of SiO2 is 3.78%, the mass content of MgO is 1.33%, the mass content of Fe2O3 is 0.11%, and the mass content of SO3 is 0.72%.

[0025] The present invention also provides a road base material prepared by any of the above methods.

[0026] Beneficial effects of the present invention:

[0027] The method for preparing road base materials by using ternary solid waste cementitious materials in combination with waste stone powder provided by the present invention utilizes waste stone powder, which is a solid waste that is difficult to handle, and uses cementitious materials prepared from fly ash, slag, and carbide slag in combination to prepare road base materials; the FKD series road base materials prepared by this method have higher strength than cement road base materials of the same age, better curing effect, and have broad application prospects.

[0028] The method of the present invention not only improves the utilization rate of waste stone powder and industrial waste slag, but also can reduce the use of traditional cementitious material cement, reduces the cost, is environmentally friendly, and complies with the concept of green development. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The 7d and 28d unconfined compressive strength of samples with different cementitious material addition ratios;

[0030] Figure 2 XRD patterns of FKD154 and cement samples (7d);

[0031] Figure 3 XRD patterns of FKD154 and cement samples (28d);

[0032] Figure 4 For EDS analysis of the sample;

[0033] Figure 5 The microscopic morphology of cement sample;

[0034] Figure 6 This is the microstructure of the FKD sample. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0036] In order to further understand the present invention, the present invention will be further described in conjunction with the accompanying drawings and embodiments.

[0037] The waste rock powder used in the following embodiments is taken from the waste rock mountain in Wulian County, Shandong Province, with a particle size of 0.0001-4.75 mm, of which the particle size of 0.075-4.75 mm accounts for 26.2%, the particle size of 0.005-0.075 mm accounts for 54.9%, and the particle size of less than 0.005 mm accounts for 18.9%. The waste rock powder has an uneven coefficient of 85, a curvature coefficient of 0.42, and poor gradation.

[0038] The fly ash used in the following examples was taken from Class I fly ash of a power plant in Shandong, the blast furnace slag used was taken from granulated blast furnace slag after water quenching in a steel plant in Jinan, Shandong, and the calcium carbide slag used was taken from an industrial gas company in Qingdao, Shandong. The main chemical compositions of the three are shown in Table 1:

[0039] Table 1 Main chemical components of fly ash, blast furnace slag and carbide slag

[0040]

[0041] Example 1

[0042] This embodiment provides a method for preparing a road base material using ternary solid waste cementitious materials in combination with waste stone powder, the steps of which are as follows:

[0043] (1) Fly ash, slag and carbide slag are mixed in a mass ratio of 1:5:4 to form a solid waste cementitious material, which is named FKD cementitious material;

[0044] (2) Place the waste rock powder in an oven set at 105°C and dry for 24 hours, then mix it with FKD cementitious material and water at a water-cement ratio of 1.0 and stir for 5 minutes;

[0045] Among them, the mixing ratio of FKD cementitious material is 20% of the sum of the mass of waste rock powder and water;

[0046] (3) The mixture is filled into a test mold in three layers, each layer is compacted, and the surface is roughened after each round of compaction;

[0047] (4) The sample is placed in a standard curing box (relative humidity 95%, temperature 20°C) for curing for 24 hours. After curing for 24 hours, the sample is demoulded and continues to be cured until the age of 28 days; thus, the road base material is obtained.

[0048] Example 2

[0049] This embodiment provides a method for preparing road base material by using ternary solid waste cementitious materials in combination with waste stone powder. The steps thereof are different from those of embodiment 1 in that the mixing ratio of the FKD cementitious materials is 15%.

[0050] The other steps are the same.

[0051] Example 3

[0052] This embodiment provides a method for preparing road base material by using ternary solid waste cementitious materials in combination with waste stone powder. The steps thereof are different from those of embodiment 1 in that the mixing ratio of the FKD cementitious materials is 10%.

[0053] The other steps are the same.

[0054] Example 4

[0055] This embodiment provides a method for preparing road base material by using ternary solid waste cementitious materials in combination with waste stone powder. The steps thereof are different from those of embodiment 1 in that the mixing ratio of the FKD cementitious materials is 5%.

[0056] The other steps are the same.

[0057] Example 5

[0058] This embodiment provides a method for preparing road base materials by using ternary solid waste cementitious materials in combination with waste stone powder. The steps thereof are different from those of Embodiment 1 in that: the maintenance is continued until the age of 20 days.

[0059] The other steps are the same.

[0060] Example 6

[0061] This embodiment provides a method for preparing road base materials by using ternary solid waste cementitious materials in combination with waste stone powder. The steps thereof are different from those of Embodiment 1 in that: the maintenance is continued until the age of 15 days.

[0062] The other steps are the same.

[0063] Example 7

[0064] This embodiment provides a method for preparing a road base material using ternary solid waste cementitious materials in combination with waste stone powder, the steps of which are as follows:

[0065] (1) Fly ash, slag and carbide slag are mixed in a mass ratio of 2:4:4 to form a solid waste cementitious material, which is named FKD cementitious material;

[0066] (2) Place the waste rock powder in an oven set at 105°C and dry for 24 hours, then mix it with FKD cementitious material and water at a water-cement ratio of 1.0 and stir for 5 minutes;

[0067] Among them, the mixing ratio of FKD cementitious material is 20% of the sum of the mass of waste rock powder and water;

[0068] (3) The mixture is filled into a test mold in three layers, each layer is compacted, and the surface is roughened after each round of compaction;

[0069] (4) The sample is placed in a standard curing box (relative humidity 95%, temperature 20°C) for curing for 24 hours. After curing for 24 hours, the sample is demoulded and continues to be cured until the age of 28 days; thus, the road base material is obtained.

[0070] Example 8

[0071] This embodiment provides a method for preparing a road base material using ternary solid waste cementitious materials in combination with waste stone powder, the steps of which are as follows:

[0072] (1) Fly ash, slag and carbide slag are mixed in a mass ratio of 1:4:5 to form a solid waste cementitious material, which is named FKD cementitious material;

[0073] (2) Place the waste rock powder in an oven set at 105°C and dry for 24 hours, then mix it with FKD cementitious material and water at a water-cement ratio of 1.0 and stir for 5 minutes;

[0074] Among them, the mixing ratio of FKD cementitious material is 20% of the sum of the mass of waste rock powder and water;

[0075] (3) The mixture is filled into a test mold in three layers, each layer is compacted, and the surface is roughened after each round of compaction;

[0076] (4) The sample is placed in a standard curing box (relative humidity 95%, temperature 20°C) for curing for 24 hours. After curing for 24 hours, the sample is demoulded and continues to be cured until the age of 28 days; thus, the road base material is obtained.

[0077] Experimental Example 1

[0078] The material provided by the present invention can replace inorganic binder stabilized materials and be used as a road base. With reference to GB / T1346-2011 "Test Methods for Water Consumption, Setting Time and Stability of Cement Standard Consistency" and JTG 3441-2024 "Test Specifications for Inorganic Binder Stabilized Materials for Highway Engineering", a cylindrical test mold with an inner diameter of 50 mm and a height of 100 mm is adopted, and three parallel samples with different proportions are prepared. The molding compaction degree is 98%, and the samples are cured for 7 days and 28 days respectively under standard curing conditions of 20° C. and 95% humidity, and the unconfined compressive strength of the samples is tested.

[0079] Table 2 below shows the mix ratio of the road base material studied in the present invention. Corresponding samples were made according to the mix ratio, and the unconfined compressive strength of each sample at 7d and 28d was obtained. On this basis, the PO 42.5 cement group was added as a lateral comparison.

[0080] Among them, the gel material type FKD244 in Table 2 indicates that the mass ratio of fly ash, blast furnace slag and carbide slag inside the gel material is 2:4:4.

[0081] Table 2 Experimental schemes for different ratio groups

[0082]

[0083] Effect of maintenance age on strength of road base materials

[0084] The relationship between the unconfined compressive strength of road base samples prepared with FKD154, FKD244, FKD145 and cement and the cementitious material mixing ratio at different ages (7d or 28d) is shown in the figure. Figure 1 As shown in the figure: Regardless of the type of cementitious material, the strength of the road base material increases with age.

[0085] The strength growth rate of road base materials is relatively fast in the initial stage of maintenance, and then gradually slows down and tends to be gentle; the strength of FKD series road base materials is higher than that of cement road base materials of the same age.

[0086] The unconfined compressive strength of each group of samples gradually increased with the increase of the cementitious material mixing ratio. The cementitious products produced by the alkali-induced reaction of the cementitious material wrapped the waste rock particles. The amount of cementitious material added was positively correlated with the compressive strength of the sample. When the mixing ratio increased from 5% to 15%, the compressive strength of the sample increased at a faster rate (see Figure 1 (a) and (b)), the strength growth rate is slow during the process from 15% to 20% (see Figure 1 (c) and (d)).

[0087] In the road base material samples, the internally generated cementitious products will bond the waste rock powder particles and fill the cracks between the particles, thereby improving the strength of the samples. The output of cementitious products increases with the increase in the amount of cementitious materials, bonding the waste rock particles and filling the cracks in the waste rock. At this time, adding more cementitious materials will only increase the compressive strength of the waste rock samples to a limited extent, and the slope of the incorporation-to-strength relationship gradually decreases.

[0088] Experimental Example 2

[0089] Micro-modification mechanism of FKD specimens

[0090] The FKD sample prepared in Example 1 was used, and a PO 42.5 cement sample was added as a comparison.

[0091] (I) XRD test analysis

[0092] When the FKD specimens and cement specimens were cured to 7 and 28 days, flake samples of natural sections were taken and placed in a 60°C drying oven for low-temperature drying for 24 hours. The samples were ground to pass a 60-mesh sieve and sealed in bags for XRD tests. The test was conducted using a D / MAX-RB rotating target X-ray diffractometer from Japan's RIGAKU Company. The test had a scanning angle of 10° to 80° and a scanning rate of 3° / min.

[0093] The samples selected for the test are FKD154 sample and PO 42.5 cement sample. The XRD patterns of the two samples at 7d and 28d are as follows: Figure 2 and Figure 3 As shown in the figure, the horizontal axis represents the XRD test scanning interval, and the vertical axis represents the peak height.

[0094] (1) Reaction mechanism of cement samples

[0095] from Figure 2 and Figure 3It can be found that the physical composition of cement samples contains CSH (hydrated calcium silicate), CAH (hydrated calcium aluminate), CASH (hydrated calcium aluminosilicate), AFt (ettringite) and other hydration product characteristic phases. PO 42.5 cement is made of cement clinker, gypsum and other mixed materials. The main components of cement clinker, such as 2CaO·SiO2 (dicalcium silicate), 3CaO·SiO2 (tricalcium silicate), 3CaO·Al2O3 (tricalcium aluminate) and 4CaO·Al2O3·Fe2O3 (tetracalcium aluminoferrate), will undergo hydration reaction to produce gels such as CSH, CAH and CASH when they meet water. These hydration products are the main cementing substances for stabilizing waste rock particles. Gypsum (CaSO4) added to cement will lead to the formation of substances such as AFt. In addition, Ca(OH)2 generated during the hydration reaction will continue to undergo ion exchange and volcanic ash reaction. These products together fill the cracks between waste rock particles.

[0096] (2) FKD sample reaction mechanism

[0097] The FKD sample mainly contains quartz, feldspar, CSH, CAH, CASH and other phases. The existence of these phases indicates that alkali-induced chemical reactions occurred inside the FKD sample.

[0098] Carbide slag dissolution to obtain Ca 2+ and OH - , OH - It reacts with SiO2 and Al2O3 in fly ash and slag to generate active [SiO4] 4- (aluminum oxide tetrahedron) and [AlO4] 5- (aluminum oxide tetrahedron), [SiO4] 4- and [AlO4] 5- With Ca 2+ and OH - The reaction generates CAH and CSH, and part of [AlO4] 5- Reacts with CSH to form CASH.

[0099] from Figure 2 and Figure 3 It can be found that the phase compositions of different curing ages are the same, namely CSH, CAH, CASH, etc. Ca(OH)2 mainly comes from carbide slag in FKD cementitious material, but no diffraction peak of Ca(OH)2 was found in the spectrum at 7d age, indicating that with the increase of curing age, Ca(OH)2 is continuously consumed as an alkali activator, which promotes the hydration reaction, generates more alkali-activated cementitious products, and improves the strength of the sample.

[0100] (II) EDS test analysis

[0101] In order to analyze the properties of the gel products of cement and FKD samples and the atomic percentage of each element therein, EDS energy spectrum analysis was carried out on the two samples at 28 days. EDS and SEM tests were carried out simultaneously, and the test position was the typical structural morphology of the observed gel products.

[0102] Figure 4 The microstructure and EDS elements of the gel material generated by cement and FKD samples at the age of 28 days are shown. Typical hydration products such as flocculent products (test point 1), needle-rod-shaped products (test point 2) under the cement system and flocculent products (test point 3) under the FKD system are tested respectively.

[0103] from Figure 4 It can be seen that the elements formed in the cement-waste rock powder and FKD-waste rock powder systems mainly include O, Na, Al, Ca, Si, etc. The Ca / Si atomic ratio in the hydration product CSH is generally between 1.2 and 2.3. The smaller the Ca / Si atomic ratio, the more unstable the crystal structure. The larger the Ca / Si atomic ratio, the more stable the crystal structure. The Ca / Si atomic ratio of test point 1 is 0.13, and the Ca / Si atomic ratio of test point 3 is 2.51. Therefore, it is inferred that the CSH generated in the FKD-waste rock powder system has a higher gel content. The elemental composition of test point 2 in the test is consistent with the crystal elements of AFt, in which the Si element is the CSH attached to the surface of AFt.

[0104] (III) SEM test analysis

[0105] The above XRD analysis shows that when FKD cementitious materials and cement are added to waste stone powder, hydration reactions will occur to generate a series of cementitious products. After the unconfined compressive strength test, the flake samples of the natural section were taken and placed in a 60°C drying oven for low-temperature drying for 24 hours. Considering that the test materials such as waste stone powder, carbide slag, and slag have poor conductivity, the charges will accumulate on the surface, resulting in unclear electron microscope imaging. Therefore, the samples need to be gold-sprayed before the electron microscope test. The instrument used for the test is the Hitachi S-4800 scanning electron microscope produced by Hitachi, Japan. In order to compare and analyze the influence of age on FKD samples and cement samples, SEM tests were performed on FKD samples and cement samples with a curing age of 7d and 28d, respectively.

[0106] (1) Microscopic morphology analysis of cement samples at 7d and 28d

[0107] Figure 5The microscopic morphology of cement samples at 7d and 28d. When the samples were cured for 7d, flocculent CSH was generated on the surface of waste rock particles. However, the amount of flocculent CSH generated at this time was small and did not completely cover the waste rock particles. There were large cracks between the cementitious products and the waste rock particles, and the crack size and distribution position were uneven (see Figure 5 (a), (b), (c)); When the cement sample was cured for 28 days, the microstructure changed significantly (see Figure 5 (d), (e), (f)). In addition to generating more flocculent CSH, a large number of needle-rod-shaped crystals are generated between the waste rock particles in an irregular arrangement. The diameter of the crystal is less than 1 μm and the length is between 5 and 100 μm. The previous EDS analysis shows that the needle-rod-shaped crystals are AFt. Compared with 7d, the cracks are significantly reduced, which indicates that the cracks between the waste rock particles are filled and cemented by the generated hydration products. The waste rock particles and the cementitious products are tightly connected together to form a three-dimensional skeleton structure. The number and size of the cracks are significantly reduced, and the density is greatly improved. This is also the main reason for the improvement of the 28d strength compared with its 7d strength.

[0108] (2) Microscopic morphology analysis of FKD samples at 7d and 28d

[0109] Figure 6 The microscopic morphology of the FKD samples at 7d and 28d is shown. After comparison with the cement samples, it is found that the flocculent CSH generated on the surface of the waste rock particles in the FKD samples at the age of 7d is large in number and has a complete structure (see Figure 6 (a), (b), (c)). Compared with the cement sample, the flocculent CSH inside it bonded the waste rock particles, and the number of internal cracks was small. According to the previous EDS analysis, the CSH generated under the FKD system is more than that generated by the cement system, its Ca / Si atomic ratio is larger, the structure is more stable, the types of cementitious products have not changed or increased, and more flocculent CSH is generated. The morphology of the FKD sample magnified to 1000 times and 5000 times is shown as follows Figure 6 (d) and 6(e). After magnification to 10000 times, Figure 6 As shown in (f), it can be clearly observed that the FKD sample with a curing age of 28 days gradually formed a three-dimensional skeleton structure. Compared with the flocculent CSH, its cementation, filling and wrapping capabilities are stronger. The entire SEM observation interface is almost covered by the three-dimensional network structure CSH, which wraps the waste rock particles. The structure is very dense and there are almost no cracks.

[0110] The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, modification, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing road base material by using ternary solid waste cementitious materials and waste stone powder, characterized in that: The following steps are involved: (1) mixing fly ash, slag and carbide slag in a mass ratio of (1-2):(4-5):(4-5) to obtain a solid waste cementitious material, namely, a FKD cementitious material; (2) Mix the dried waste rock powder with FKD cementitious material and water at a water-cement ratio of 1.0 and stir evenly; wherein the mixing ratio of FKD cementitious material is 5% to 30%; (3) The uniformly stirred mixture is filled into the test mold in three layers, each layer is compacted, and the surface is roughened after each round of compaction; (4) Place the sample in a standard curing box with a relative humidity of 95% and a temperature of 20°C, remove the sample from the mold after curing for 24 hours, and continue curing until the set age.

2. The method according to claim 1, characterized in that: The mass ratio of the fly ash, slag and carbide slag is 1:5:

4.

3. The method according to claim 1, characterized in that: The mixing ratio of the FKD gelling material is the mass ratio of the FKD gelling material to the waste stone powder, and the mixing ratio is 15% to 20%.

4. The method according to claim 1, characterized in that The set age is 15 to 30 days.

5. The method according to claim 4, characterized in that The set age is 28 days.

6. The method according to claim 1, characterized in that The particle size of the waste stone powder is 0.0001-4.75 mm, of which the waste stone powder with a particle size of 0.075-4.75 mm accounts for 26.2%, the particle size of 0.005-0.075 mm accounts for 54.9%, and the particle size below 0.005 mm accounts for 18.9%; The waste rock powder has an unevenness coefficient of 85 and a curvature coefficient of 0.

42.

7. The method according to claim 1, characterized in that The fly ash contains 6.60% CaO, 12.66% Al2O3, 61.29% SiO2, 0.02% MgO, 4.48% Fe2O3, 3.75% Na2O and 0.66% SO3 by mass.

8. The method according to claim 1, characterized in that: The slag is granulated blast furnace slag, which contains CaO with a mass content of 41.17%, Al2O3 with a mass content of 13.61%, SiO2 with a mass content of 29.47%, MgO with a mass content of 8.04%, Fe2O3 with a mass content of 0.425%, Na2O with a mass content of 0.676%, and SO3 with a mass content of 4.90%.

9. The method according to claim 1, characterized in that: The mass content of CaO in the carbide slag is 67.9%, the mass content of Al2O3 is 1.76%, the mass content of SiO2 is 3.78%, the mass content of MgO is 1.33%, the mass content of Fe2O3 is 0.11%, and the mass content of SO3 is 0.72%.

10. The road base material prepared by the method according to any one of claims 1 to 9.

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