Curing agent for curing road foundation and preparation method thereof

Abstract

The invention discloses a curing agent for curing a road foundation and a preparation method of the curing agent. The curing agent comprises the following components in percentage by mass: 60-65% of a hydrated active material, 20-25% of a flexible strength material, 10-15% of a compact material, 3-5% of an early strength material and 0.5-1% of an excitation material, wherein the hydrated active material is formed by compounding three or more of solid waste cement, steel slag, alkaline residues, power plant slag, waste coal ash below grade III and ardealite. The curing agent replaces cement, lime and other traditional high-energy-consumption pollution curing agents, three or more common industrial solid wastes are compounded, the solid waste utilization rate is increased, the cement consumption is reduced, the curing agent is non-toxic and harmless, environment damage caused by natural road building material mining is avoided, and the curing agent conforms to the green development trend; through five functional modules including hydration activity, flexible strength, compactness, early strength and excitation, the compressive strength of the solidified soil is greatly improved compared with that of a traditional material, water stability and freezing stability are excellent, indexes such as compactness reach the standard, the problem of performance imbalance of a traditional curing agent is solved, and the service life of a road is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of road engineering materials, and particularly relates to a curing agent for curing road foundation and a preparation method thereof. BACKGROUND

[0002] Curing of road foundation is a core link for guaranteeing stability and durability of traffic engineering. Currently, cement and lime are widely used as mainstream curing agents in the industry, and natural materials such as stone and river sand are also used to construct road base.

[0003] However, the production process of cement and lime has high energy consumption and large pollutant emissions, which is contrary to the concept of green development. Moreover, overexploitation of natural road construction materials leads to a growing shortage of resources, which not only aggravates the destruction of the ecological environment, but also increases the cost of road construction year by year. In addition, the road foundation performance is poor when using cement and lime as curing agents, such as insufficient compressive strength, poor water stability and poor frost stability, which is difficult to adapt to complex soil. SUMMARY

[0004] The present application relates to the technical field of road engineering materials, and particularly relates to a curing agent for curing road foundation and a preparation method thereof.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: A curing agent for curing road foundation and a preparation method thereof, comprising the following components in mass percentage: 60-65% of hydration active material, 20-25% of flexible strength material, 10-15% of dense material, 3-5% of early strength material, and 0.5-1% of excitation material; wherein the hydration active material comprises solid waste cement, steel slag, alkali slag, power plant slag, waste coal ash below grade III, and phosphogypsum, and is prepared by compounding a plurality of materials.

[0006] As a further scheme of the present application, the hydration active material is compounded in the following weight parts: 180-220 parts of solid waste cement, 40-60 parts of steel slag, 85-115 parts of alkali slag, 180-220 parts of power plant slag, 40-60 parts of waste coal ash below grade III, and 85-115 parts of phosphogypsum.

[0007] As a further scheme of the present application, the flexible strength material comprises calcium oxide and hydrated lime, and is compounded in the following weight parts: 85-115 parts of calcium oxide and 40-60 parts of hydrated lime.

[0008] As a further scheme of the present application, the dense material comprises silica fume and active silicon dioxide, and is compounded in the following weight parts: 70-90 parts of silica fume and 15-25 parts of active silicon dioxide.

[0009] As a further scheme of the present application, the dense material comprises silica fume, and is compounded in the following weight parts: 85-115 parts of silica fume.

[0010] As a further scheme of the present application: the early strength material comprises anhydrous sodium sulfate, aluminum sulfate and aluminum oxide, and the weight ratio is as follows: anhydrous sodium sulfate 4-6 parts, aluminum sulfate 8-12 parts, and aluminum oxide 4-6 parts.

[0011] As a further scheme of the present application: the excitation material comprises two or more of flake soda, water glass, sodium metasilicate, calcium bentonite and sodium aluminate.

[0012] As a further scheme of the present application: the excitation material comprises two or more of flake soda, water glass, sodium metasilicate, calcium bentonite and sodium aluminate.

[0013] As a further scheme of the present application: the excitation material comprises two or more of flake soda, water glass, sodium metasilicate, calcium bentonite and sodium aluminate.

[0014] As a further scheme of the present application: a preparation method of a curing agent for road foundation curing, characterized in that, comprising the following steps: S1: all raw materials are respectively crushed and ground, and the specific surface area is controlled to be 350-500 m2 / kg; S2: a first preset amount of hydration active material is obtained and put into a mixer; S3: flexible strength material, dense material, early strength material and excitation material are mixed to obtain a first mixture, and the first mixture is put into the mixer to obtain a second mixture; S4: the second mixture is detected, and the fineness index is ≦10 and the water content is ≦1.

[0015] Compared with the prior art, the present application has the following advantages: 1. The curing agent of the present application replaces traditional high-energy consumption and pollution curing agents such as cement and lime, and is compounded by three or more general industrial solid wastes, thereby improving the utilization rate of solid wastes, reducing the amount of cement, and being non-toxic and harmless, which avoids the destruction of the environment caused by the exploitation of natural road-building materials and conforms to the green development trend. 2. The five functional modules of hydration active material, flexible strength material, dense material, early strength material and excitation material improve the compressive strength of the cured soil by 40%-200% compared with traditional materials, increase the early strength by 25%-30% in 7 days, have excellent water stability and frost stability, and meet the standards of density and modulus of resilience, thereby solving the performance imbalance problem of traditional curing agents and prolonging the service life of the road. 3. It can utilize local soil without the need for soil replacement, replacing a large amount of traditional base materials, reducing road construction costs by 20%-40% compared to the same period last year, while saving transportation and labor costs and enhancing the value of engineering applications. Attached Figure Description

[0016] Figure 1 This is a production process flow diagram for a curing agent used for road foundation curing.

[0017] Figure 2 This is a flow chart of a production equipment for a curing agent used in road foundation curing. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] A roadbed curing agent comprising the following components by weight percentage: 60-65% hydration active material, 20-25% flexible strength material, 10-15% compacting material, 3-5% early strength material, and 0.5-1% activating material.

[0020] Among them, hydration-active materials play a key role in the curing agent, as they can chemically react with water to generate substances with cementing properties, thereby providing initial strength and adhesion for the road foundation; flexible strength materials are mainly used to enhance the flexibility of the road foundation, making it less prone to cracking when subjected to different degrees of deformation, and improving the fatigue resistance of the road; compacting materials fill the pores of the road foundation, increasing its density, reducing water penetration and air intrusion, and improving the stability of the road foundation; early strength materials can accelerate the early hardening process of the curing agent, shorten the construction cycle, and enable the road to be put into use as soon as possible; activating materials can stimulate the potential activity of other materials, promote chemical reactions, and improve the overall performance of the curing agent.

[0021] Specifically, the hydration-active material is composed of three or more of the following: solid waste cement, steel slag, alkali slag, power plant slag, waste coal ash below Grade III, and phosphogypsum. The preferred weight proportions are as follows: 180-220 parts solid waste cement, 40-60 parts steel slag, 85-115 parts alkali slag, 180-220 parts power plant slag, 40-60 parts waste coal ash below Grade III, and 85-115 parts phosphogypsum. In practical applications, three or more of the above components can be selected and combined according to the construction environment, foundation soil type, and performance requirements. Through the synergistic hydration reaction of the multiple components, the active advantages of each material are fully utilized, improving the overall performance of the solidification system.

[0022] Part of the reaction process is as follows: The hydration reaction of tricalcium silicate (C3S, 3CaO・SiO2) in cement / steel slag:

[0023] Specifically, the flexible strength material includes calcium oxide and quicklime, preferably in the following weight ratio: 85-115 parts calcium oxide and 40-60 parts quicklime.

[0024] The hydration reaction of calcium oxide (CaO) is as follows:

[0025] Concerted reaction of slaked lime (Ca(OH)2):

[0026] Calcium oxide rapidly hydrates in water to form calcium hydroxide, releasing heat while filling tiny pores and providing early flexibility to the system. Quicklime, by regulating the hydration reaction rate, prevents volume expansion and cracking caused by excessive hydration of calcium oxide. At the same time, it combines with the cementitious products generated by the hydration active materials to form a network structure that combines rigidity and toughness. This significantly improves the crack resistance of the solidified body when subjected to deformation, effectively resisting fatigue damage to road foundations caused by vehicle loads and temperature changes.

[0027] Specifically, the compacting material includes silica fume and activated silica, preferably in the following weight ratio: 70-90 parts silica fume and 15-25 parts activated silica, or 85-115 parts silica fume alone. Silica fume, with its nano-particle characteristics, can precisely fill the micron-sized pores between the gel products generated by the hydration active material, reducing internal voids in the solidified body; activated silica can undergo a secondary hydration reaction with calcium hydroxide in the hydration system, generating more dense hydrated calcium silicate gel, further enhancing the structural compactness.

[0028] The secondary hydration reaction between active silica (SiO2) and calcium hydroxide is involved.

[0029] Each of the two ratios has its own advantages: the synergy between silica fume and active silica is more suitable for foundation soil with high porosity (such as sandy soil) or for scenarios with strict requirements for waterproofing and seepage prevention; using silica fume alone is more suitable for working conditions with high requirements for construction convenience or relatively dense foundation soil (such as cohesive soil), simplifying the batching process while ensuring compaction efficiency.

[0030] Specifically, the early strength material includes sodium sulfate, aluminum sulfate and aluminum oxide, preferably in the following weight ratio: 4-6 parts sodium sulfate, 8-12 parts aluminum sulfate and 4-6 parts aluminum oxide.

[0031] Among them, sodium sulfate (Na2SO4) accelerates the hydration reaction:

[0032] The reaction of aluminum sulfate (Al2(SO4)3) to form ettringite (AFt):

[0033] Cooperatively activated reaction of alumina (Al2O3):

[0034] Sodium sulfate can accelerate the hydration reaction process of cement, steel slag and other components in hydration-active materials, and promote the rapid generation of early strength products such as hydrated calcium silicate and calcium hydroxide; aluminum sulfate can combine with calcium ions in the hydration system to quickly form needle-shaped ettringite crystals, which fill the tiny pores inside the solidified body and improve the early structural strength; aluminum oxide can enhance the reactivity of the system and further shorten the hydration induction period. Under the synergistic effect of the three, the 7-day compressive strength of the road foundation solidified body can be increased by 25%-30% compared with the system without early strength materials.

[0035] Specifically, the activating material is composed of two or more of the following: caustic soda flakes, water glass, sodium metasilicate, calcium-based bentonite, and sodium aluminate. The components of the activating material are proportioned by weight as follows: caustic soda flakes 0.8-1.2 parts, water glass 1.6-2.4 parts, sodium metasilicate 0.4-0.6 parts, calcium-based bentonite 1.6-2.4 parts, and sodium aluminate 0.4-0.6 parts; or water glass 2.5-3.5 parts and sodium aluminate 1.6-2.4 parts.

[0036] Among them, caustic soda can quickly adjust the pH of the curing system to an alkaline environment of 12-13, activating the potential hydration activity of steel slag and alkali slag in the hydration active materials; water glass can provide a large number of silicon-oxygen tetrahedra, which react with hydration products to form a dense hydrated calcium silicate gel, strengthening the structural compactness; sodium metasilicate has both dispersing and activating effects, which can improve the mixing uniformity of each component and promote the dissolution of active ingredients; calcium-based bentonite can adsorb free water in the system, reducing porosity while improving the toughness of the cured body; sodium aluminate can synergistically work with aluminum sulfate in early strength materials to accelerate the formation of ettringite crystals and further enhance the activation effect.

[0037] The first mixing method is suitable for scenarios with complex foundation soil or high requirements for the toughness of the solidified body, and can achieve comprehensive performance improvement through multi-component synergy; while the second mixing method is suitable for simple soil such as sandy soil or for working conditions that pursue construction convenience, reducing the complexity of mixing while ensuring activation efficiency.

[0038] Example 1 A road foundation hardener, comprising the following components by mass percentage: 60% hydration-active material (300 kg solid waste cement, 150 kg alkali slag, 150 kg phosphogypsum), 25% flexible strength material (167 kg calcium oxide, 83 kg quicklime), 10% compacting material (80 kg silica fume, 20 kg activated silica), 4% early-strength material (10 kg sodium sulfate, 20 kg aluminum sulfate, 10 kg alumina), and 1% activating material (2 kg caustic soda flakes, 4 kg water glass, 1 kg sodium metasilicate, 4 kg calcium-based bentonite, 1 kg sodium aluminate).

[0039] like Figure 1 and Figure 2 As shown in this embodiment, the preparation method of the curing agent for road foundation curing includes the following steps: 1. All raw materials (hydration-active materials, flexible strength materials, dense materials, early strength materials, and activating materials) are crushed and ground separately, with the specific surface area controlled at 350-500㎡ / kg; 2. 300 kg of solid waste cement, 150 kg of alkali residue, and 150 kg of phosphogypsum are transported to the metering silo via a conveying auger, and then fed into the mixer after metering. 3. Add the pre-mixed calcium oxide (167 kg), quicklime (83 kg), silica fume (80 kg), activated silica (20 kg), sodium sulfate (10 kg), aluminum sulfate (20 kg), alumina (10 kg), caustic soda (2 kg), water glass (4 kg), sodium metasilicate (1 kg), calcium-based bentonite (4 kg), and sodium aluminate (1 kg) to the mixer; start the mixer, control the speed to 45-60 r / min, and mix for 5 minutes. The dust removal device should be running simultaneously during the mixing process. 4. The mixed materials shall be tested for the following properties: fineness ≤ 10, moisture content ≤ 1. 5. After passing the test, the finished products are weighed and packaged, and then stored in a sealed container.

[0040] The curing agent obtained in Example 1 is suitable for humus-containing clayey soils, which have high porosity, weak adhesion, are prone to cracking, and are highly hydrophilic. In this example, the hydration-active material in the curing agent is a compound of solid waste cement, alkali slag, and phosphogypsum. The solid wastes synergistically hydrate to generate a dense cementitious product, which can counteract the weakening effect of humus on adhesion. The flexible strength material accounts for a relatively high proportion (25%), where calcium oxide hydration releases heat to accelerate consolidation, and quicklime regulates the reaction rate to prevent expansion and cracking, forming a structure with a rigid framework and flexible connections, suitable for the cracking characteristics of clayey soils. The compacting material uses a binary filling system of silica fume and active silica, with nano-sized particles precisely filling the pores of the clayey soil to improve compaction. The activating material contains calcium-based bentonite, which can adsorb free water. Combined with multiple activating components, it changes the soil from hydrophilic to hydrophobic, solving the problems of moisture sensitivity and easy expansion and contraction of clayey soils, and improving water stability.

[0041] When this curing agent is added at 10% of the mass of humus-containing clayey soil, and water is added to adjust the soil moisture content to 20%, after spreading, compacting and curing for 7 days, the unconfined compressive strength is measured to be 1.25 MPa; after curing for 28 days, the unconfined compressive strength is measured to be 2.32 MPa, which far exceeds the industry standard, with no obvious cracks, and is suitable for the high toughness requirements of complex soils.

[0042] Example 2 A road foundation hardener, comprising the following components by mass percentage: 65% hydration-active material (289 kg solid waste cement, 289 kg power plant slag, 72 kg Class III waste coal ash), 20% flexible strength material (133 kg calcium oxide, 67 kg quicklime), 10% compacting material (100 kg silica fume), 4.5% early-strength material (7.5 kg sodium sulfate, 15 kg aluminum sulfate, 7.5 kg alumina), and 0.5% activating material (3 kg water glass, 2 kg sodium aluminate).

[0043] In this embodiment, the preparation method of the curing agent for road foundation curing is the same as that in Example 1.

[0044] The curing agent obtained in Example 2 is suitable for convenient construction in sandy soil. Sandy soil particles are loose and have poor cohesion. The hydration active material in the curing agent of Example 2 is a compound of solid waste cement, power plant slag and Class III waste coal ash. The particle skeleton effect of power plant slag and the pozzolanic activity of waste coal ash work together to improve the interlocking force with sandy soil particles. The compacting material is a single silica fume, and the activating materials are water glass and sodium aluminate. Compared with Example 1, three components are reduced, the batching steps are reduced by 30%, and the construction efficiency is improved.

[0045] When this curing agent is added at 8% of the mass of sandy soil, and water is added to adjust the moisture content to 18%, after spreading, compacting and curing for 7 days, the unconfined compressive strength is measured to be 1.13 MPa; after curing for 28 days, the unconfined compressive strength is measured to be 2.15 MPa. This meets the strength requirements while reducing raw material consumption and is suitable for the convenient construction needs of sandy soil.

[0046] Example 3 A road foundation hardener, comprising the following components by mass percentage: 72% hydration-active material (300 kg solid waste cement, 120 kg steel slag, 300 kg phosphogypsum), 18% flexible strength material (120 kg calcium oxide, 60 kg quicklime), 7% compacting material (49 kg silica fume, 21 kg activated silica), 2.5% early-strength material (6.25 kg sodium sulfate, 12.5 kg aluminum sulfate, 6.25 kg alumina), and 0.5% activating material (1 kg caustic soda, 1.5 kg water glass, 1.5 kg calcium-based bentonite, 1 kg sodium aluminate).

[0047] In this embodiment, the preparation method of the curing agent for road foundation curing is the same as that in Example 1.

[0048] The curing agent obtained in Example 3 is suitable for construction requirements of high-moisture-content materials such as pile foundation mud, subway shield tunnel mud, and river silt. These materials have high moisture content, and traditional processes require complex treatments such as sedimentation dehydration, sun drying, or physical filtration, which takes 3-7 days and is costly. The curing agent obtained in this example increases the proportion of hydration-active materials, and the hydration reaction efficiency is significantly improved after the multi-component compounding of solid waste cement, steel slag, and phosphogypsum. It quickly generates a large number of cementitious products to encapsulate and lock in free water, providing core cementitious support for the solidification of high-moisture-content materials. The dense material adopts a binary synergistic system of silica fume and active silica, and the nano-sized particles are tightly combined with the hydration products to form a dense structural barrier, achieving efficient solid-liquid separation without additional dehydration processes. The calcium-based bentonite in the activating material works synergistically with the multi-component activating components to enhance the water adsorption capacity and compensate for the lack of toughness of the solidified body under high moisture content, avoiding cracking or softening.

[0049] This curing agent is added at 8% of the river silt mass. No pretreatment such as settling or filtration is required; it can be directly mixed, spread, and compacted. Temporary traffic strength is achieved after 3 days of curing with no bleeding. The unconfined compressive strength is 1.08 MPa after 7 days of curing and reaches 2.09 MPa after 28 days. The solidified body has a dense structure and exhibits no softening or disintegration. Compared to traditional methods, the construction cycle is shortened by more than 80%, significantly reducing site occupation and dewatering equipment costs, and enabling low-cost, direct resource utilization of high-moisture-content materials.

[0050] Example 4 A road foundation hardener, comprising the following components by mass percentage: 63% hydration-active material (210 kg solid waste cement, 210 kg power plant slag, 110 kg alkaline slag), 22% flexible strength material (121 kg calcium oxide, 61 kg quicklime), 10% compacting material (100 kg silica fume), 4% early-strength material (10 kg sodium sulfate, 20 kg aluminum sulfate, 10 kg alumina), and 1% activating material (3 kg water glass, 1 kg sodium metasilicate, 4 kg calcium-based bentonite, 2 kg sodium aluminate).

[0051] In this embodiment, the preparation method of the curing agent for road foundation curing is the same as that in Example 1.

[0052] The curing agent obtained in this embodiment is suitable for the low-temperature environment in the north. It solves the problem of poor freeze-thaw resistance of traditional cured soil. The waterproof performance is improved by the synergistic effect of the compacting material and the activating material. Silica fume fills the pores and combines with water glass to generate dense hydration products. Calcium-based bentonite adsorbs free water, so that the water absorption rate of the cured body is reduced by 60% compared with traditional lime soil, reducing the damage caused by water freezing and expansion during freeze-thaw. The flexible strength material and multi-component synergistically optimize the thermal shrinkage performance. The absolute value of the thermal shrinkage coefficient of the cured soil is much smaller than that of lime soil and lime-fly ash soil, and the deformation capacity at low temperature is significantly improved.

[0053] When this curing agent is added at 10% of the mass of ordinary cohesive soil, under low-temperature curing conditions of 5℃, the unconfined compressive strength reaches 1.05MPa after 7 days and 2.1MPa after 28 days. After 28 days of curing, 20 freeze-thaw cycles (freezing at 25℃ for 12 hours, followed by thawing at 20℃ for 12 hours) were performed, and the solidified body showed no cracks or disintegration, with a mass loss rate of only 2.1%. Even when applied directly at -5℃, the compressive strength still reaches 1.02MPa after 7 days of curing, fully meeting the requirements for winter construction and long-term freeze resistance in northern regions.

[0054] Comparative Example A road foundation hardener, wherein the components are expressed as follows by mass percentage: 85% hydration active material (700 kg ordinary silicate cement, 150 kg Class II fly ash), 10% compacting material (100 kg ordinary fly ash), 4% early strength material (40 kg sodium sulfate), and 1% activating material (10 kg water glass).

[0055] This comparative example is a conventional cement-based curing agent formulation from the prior art, and its preparation method includes the following steps: 1. All raw materials are pulverized, and the specific surface area is controlled at 350-500㎡ / kg; 2. Put 700 kg of ordinary Portland cement and 150 kg of Grade II fly ash into the metering hopper, and then send them into the mixer after metering. 3. Add 100kg of ordinary fly ash, 40kg of sodium sulfate, and 10kg of water glass to the mixer, control the speed to 45-60r / min, and mix for 5 minutes. The dust removal device will operate simultaneously during the mixing process. 4. The mixed materials must be tested for the following properties: fineness ≤ 10, moisture content ≤ 1%. 5. After passing the test, the finished products are weighed and packaged, and then stored in a sealed container.

[0056] The curing agent obtained in the comparative experiment has a simple composition design, lacking specialized flexible strength materials. Both the early strength and activating materials are single components, lacking a multi-component synergistic effect, resulting in a narrow applicability range. It can only be used for ordinary cohesive soils and cannot handle complex soil types such as humus-containing cohesive soils and sandy soils. When this curing agent was added at 10% of the mass of ordinary cohesive soil, after spreading, compaction, and curing for 7 days, the unconfined compressive strength was measured to be 0.85 MPa; after 28 days of curing, the unconfined compressive strength was measured to be 2.02 MPa, and it was prone to cracking and had poor water stability. When used for high-moisture-content silt, additional settling, dewatering, sun-drying, or physical filtration is required, with a construction cycle of up to 5 days. It is prone to softening after curing; after 5 freeze-thaw cycles at -25℃, obvious cracks appeared, with a mass loss rate of 15%, failing to meet the requirements for low-temperature use in northern regions.

[0057] Compared with the above comparative examples, the curing agent of this patent uses a compound of solid waste and hydration active materials, and adds flexible strength materials. The early strength and activation materials are all multi-component synergistic systems, with more comprehensive functions. It can specifically meet the curing needs of complex soils such as humus-containing clayey soil and sandy soil. The strength is significantly improved compared with the existing technology, and the crack resistance and water stability are significantly optimized. Moreover, the construction is flexible, providing differentiated ratios, taking into account the needs of high performance and convenient construction, while realizing the resource utilization of solid waste.

[0058] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A curing agent for road foundation hardening, characterized in that, It includes the following components by mass percentage: 60-65% hydration active material, 20-25% flexible strength material, 10-15% dense material, 3-5% early strength material, and 0.5-1% activating material; among which, the hydration active material includes solid waste cement, steel slag, alkali slag, power plant slag, waste coal ash below grade III, and phosphogypsum, and is made by compounding multiple of these materials.

2. The curing agent for road foundation solidification according to claim 1, characterized in that, The hydration active materials are formulated in the following proportions by weight: 180-220 parts solid waste cement, 40-60 parts steel slag, 85-115 parts alkali slag, 180-220 parts power plant slag, 40-60 parts waste coal ash below grade III, and 85-115 parts phosphogypsum.

3. The curing agent for road foundation solidification according to claim 1, characterized in that, The flexible strength material includes calcium oxide and quicklime, in the following weight ratio: 85-115 parts calcium oxide and 40-60 parts quicklime.

4. The curing agent for road foundation solidification according to claim 1, characterized in that, The dense material consists of silica fume and active silica, in the following weight ratio: 70-90 parts silica fume and 15-25 parts active silica.

5. The curing agent for road foundation solidification according to claim 1, characterized in that, The dense material includes silica fume, in the following weight proportions: 85-115 parts silica fume.

6. The curing agent for road foundation solidification according to claim 1, characterized in that, The early strength material includes sodium sulfate, aluminum sulfate and aluminum oxide, and is formulated in the following weight ratio: sodium sulfate 4-6 parts, aluminum sulfate 8-12 parts, and aluminum oxide 4-6 parts.

7. The curing agent for road foundation solidification according to claim 1, characterized in that, The activating materials include two or more of the following: caustic soda flakes, water glass, sodium metasilicate, calcium-based bentonite, and sodium aluminate.

8. The curing agent for road foundation solidification according to claim 7, characterized in that, The components of the activating material are proportioned by weight as follows: 0.8-1.2 parts caustic soda flakes, 1.6-2.4 parts water glass, 0.4-0.6 parts sodium metasilicate, 1.6-2.4 parts calcium-based bentonite, and 0.4-0.6 parts sodium aluminate.

9. A curing agent for road foundation solidification according to claim 7, characterized in that, The components of the activating material are proportioned by weight as follows: 2.5-3.5 parts water glass and 1.6-2.4 parts sodium aluminate.

10. A method for preparing a road foundation curing agent according to any one of claims 1-9, characterized in that, Includes the following steps: S1: All raw materials are crushed and ground separately, and the specific surface area is controlled at 350-500㎡ / kg; S2: Obtain the first preset amount of hydrated active material and put it into the mixer; S3: Mix flexible strength material, dense material, early strength material and activating material to obtain a first mixture, and put the first mixture into a mixer to stir to obtain a second mixture; S4: The second mixture shall be tested for the following parameters: fineness index ≤10, moisture content ≤1.

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