A high-performance ecological enhancer for subgrade in-situ soil, a preparation method and a construction method

Abstract

The present application relates to the field of subgrade soil treatment, and particularly relates to a subgrade in-situ soil high-performance ecological enhancer, a preparation method and a construction method, the enhancer comprising the following raw materials in percentage by mass: sulphoaluminate cement 45-85%; Portland cement 8-25%; quicklime 3-5%; fly ash 0-15%; silica fume 0-8%; slag powder 0-15%; sodium sulfate 3-5%; sodium silicate 0-2%; lithium carbonate 0-0.8%; polymer enhancer 0-1.5%; silicone powder 0-1.5%; sodium lignosulfonate 0.1-0.3%. The enhancer effectively combines the advantages of sulphoaluminate cement and Portland cement, combines other components, has the characteristics of rapid setting and fast early strength development, can regulate soil strength, meets the requirements of compressive strength and durability in engineering construction, shortens the construction period, and meets the demand of 4-6h rapid traffic under the scene of emergency repair.

Description

Technical Field

[0001] This invention relates to the field of roadbed soil treatment technology, and in particular to a high-performance ecological enhancer for in-situ roadbed soil, its preparation method, and its construction method. Background Technology

[0002] Soil stabilization technology, as a novel technology that optimizes and improves soil performance, enhances construction efficiency, and improves the economy and durability of construction sections, has been applied in road engineering construction. The mechanism by which soil stabilization and increased strength are achieved through the use of soil strengthening agents. Soil strengthening agents are new energy-saving and environmentally friendly engineering materials synthesized from various inorganic and organic materials, used to stabilize various types of soil. Through physical and chemical reactions, they alter the engineering properties of the soil.

[0003] Emergency road repair demands extremely high levels of early strength, ease of construction, and environmental adaptability. Therefore, reinforcing agents are typically formulated primarily with silicate-based and sulfoaluminate-based materials, combined with other functional additives. While existing soil stabilization technologies have improved soil engineering properties through reinforcing agents, these agents still suffer from the following shortcomings: First, some products use non-environmentally friendly raw materials, contradicting the concept of ecological construction; second, early strength development is slow, making it difficult to meet the 4-6 hour rapid reopening requirements of emergency repair scenarios; and third, they have poor adaptability to different types of in-situ soils such as clay and sandy soil, and the stabilization effect is easily affected by soil properties, resulting in instability.

[0004] Therefore, in emergency road repair, it is necessary to effectively improve the performance of natural soil and develop a high-performance ecological enhancer for in-situ roadbed soil to achieve the goals of ecological protection and rapid early strength attainment. Summary of the Invention

[0005] The purpose of this invention is to overcome the problem that the early strength development of the reinforcing agents used in the prior art is slow and it is difficult to meet the requirement of rapid traffic opening in 4-6 hours in emergency repair scenarios. The invention provides a high-performance ecological reinforcing agent for in-situ soil of roadbed, its preparation method and construction method, which achieves ecological and environmental protection, rapid achievement of early strength standards, broad-spectrum soil adaptability and controllable cost.

[0006] In a first aspect, the present invention provides a high-performance ecological enhancer for in-situ roadbed soil, comprising the following raw materials by mass percentage:

[0007] Sulfoaluminate cement 45%~85%;

[0008] Portland cement 8%~25%;

[0009] 3%~5% quicklime;

[0010] Fly ash 0%~15%;

[0011] Silica fume 0%~8%;

[0012] Slag powder 0%~15%;

[0013] Sodium sulfate 3%~5%;

[0014] Sodium silicate 0%~2%;

[0015] Lithium carbonate 0%~0.8%;

[0016] Polymer reinforcing agent 0%~1.5%;

[0017] Organosilicon powder 0%~1.5%;

[0018] Sodium lignosulfonate 0.1%~0.3%.

[0019] In the above technical solution, the solidified soil utilizes locally available soil (such as sand, silt, clay, etc.) and is mixed with the reinforcing agent of the present invention to form a high-strength, water-resistant hardened body in a short time, thereby achieving rapid, low-cost, and efficient emergency clearance.

[0020] OPC (Optical Portland Cement) is a mature, widely available, and relatively low-cost cement that provides stable late-stage strength and durability, serving as a fundamental guarantee of strength. However, OPC's early strength development is relatively slow, its crack resistance is average, and it is quite sensitive to low-temperature environments. Sulfoaluminate cement (SAC), on the other hand, features rapid setting and hardening, achieving strength within 3 hours and reaching 3-5 times the strength of OPC within 24 hours, perfectly meeting emergency needs. Furthermore, the dense hydration products of sulfoaluminate provide strong impermeability, resisting water erosion; they can compensate for some shrinkage, reducing the risk of cracking; and they can still hydrate and harden normally below 0°C, exhibiting excellent environmental adaptability and low-temperature resistance. Combining OPC and Sulfoaluminate cement as the main cementitious materials achieves complementary advantages: SAC provides a strong initial performance, ensuring rapid passage for emergency vehicles; while OPC provides long-term protection, ensuring the road continues to provide stable service and guaranteeing the long-term performance of the reinforcing agent system.

[0021] Quicklime (CaO) provides an alkaline environment, stimulating soil activity and reducing moisture content; sodium sulfate (Na2SO4) acts as an early-strength agent, accelerating cement hydration; sodium silicate (Na2SiO3, water glass) acts as an alkali activator and waterproofing agent; lithium carbonate (Li2CO3) acts as an early-strength agent, accelerating cement hydration; polymer reinforcing agents can significantly improve flexibility, crack resistance, and bond strength; sodium lignosulfonate (C... 20 H 24 Na2O 10 S2) can improve mixing performance.

[0022] As a preferred embodiment of the present invention, the organosilicon powder is a porous organosilicon powder with specific parameters of particle size of 0.5~10μm, pore size of 50~100nm, and main component of silane, which can improve impermeability.

[0023] As a preferred embodiment of the present invention, the polymer reinforcing agent is VAE powder (ethylene-vinyl acetate copolymer redispersible latex powder), which is a water-soluble redispersible powder. VAE powder can significantly improve the flexibility of the solidified soil, enhance the material's adaptability to external deformation, reduce the risk of brittle fracture, and at the same time enhance the bonding force between the reinforcing agent and soil particles, promote the formation of a denser overall structure of the solidified body, and improve the mechanical properties of the solidified soil.

[0024] As a preferred embodiment of the present invention, the reinforcing agent further includes 1% to 10% steel slag powder. The active mineral components (such as dicalcium silicate, tricalcium aluminate, etc.) contained in the steel slag powder can undergo a secondary hydration reaction with cement hydration products to generate more cementitious substances, thereby enhancing the compressive strength and cohesion of the soil; at the same time, the particles fill the soil pores, improve the density, and further enhance the bearing capacity of the roadbed.

[0025] As a preferred embodiment of the present invention, the reinforcing agent further includes 0.05% to 0.2% fiber powder. In practical applications, the addition of fiber powder can significantly improve crack resistance. This ability to improve crack resistance can effectively resist the formation of cracks caused by various external factors, thereby ensuring the stability and durability of the material or structure during use.

[0026] As a preferred embodiment of the present invention, the reinforcing agent comprises the following raw materials in weight percentages:

[0027] Sulfoaluminate cement 75%~85%;

[0028] Portland cement 8%~15%;

[0029] 3%~5% quicklime;

[0030] Sodium silicate 0.5%~1.5%;

[0031] Lithium carbonate 0.3%~0.8%;

[0032] Polymer reinforcing agent 0%~1.5%;

[0033] Organosilicon powder 0.8%~1.2%;

[0034] Sodium lignosulfonate 0.1%~0.3%. The reinforcing agent using the above formula is a rapid-setting formula, capable of achieving rapid soil solidification. After using this reinforcing agent, the soil can transform from a relatively loose state to a solidified state with a certain strength in a short period of time. This rapid solidification further achieves early soil strength, enabling the soil to possess relatively high strength properties at an early stage.

[0035] As a preferred embodiment of the present invention, the reinforcing agent comprises the following raw materials in weight percentages:

[0036] Sulfoaluminate cement 45%~60%;

[0037] Silicate cement 10%~20%;

[0038] 3%~5% quicklime;

[0039] Fly ash 0%~10%;

[0040] Silica fume 0%~5%;

[0041] Slag powder 5~15%;

[0042] Sodium sulfate 3%~5%;

[0043] Sodium silicate 0%~1.5%;

[0044] Lithium carbonate 0%~0.6%;

[0045] Polymer reinforcing agent 0.5%~1.2%;

[0046] Organosilicon powder 0.5%~1.2%;

[0047] Sodium lignosulfonate 0.1%~0.2%.

[0048] As a preferred embodiment of the present invention, the mass ratio of sulfoaluminate cement, silicate cement, and quicklime is 12~19:3~4:1. By controlling the above ratio, the rapid hardening and early strength characteristics of sulfoaluminate cement and the durability advantages of silicate cement are combined. With the addition of quicklime to activate the activity, it can be ensured that the reinforcing agent reaches the required strength for traffic within 4-6 hours, while improving the crack resistance and stability of the solidified soil.

[0049] In a second aspect, the present invention provides a method for preparing a high-performance ecological enhancer for in-situ roadbed soil. The preparation method is as follows: after weighing the raw materials according to the mass percentage, the raw materials are put into a mixing device with a mixing rate of 100 to 1000 r / min and mixed evenly to obtain the enhancer.

[0050] In a third aspect, the present invention provides an early-strength solidified soil, which, by mass percentage, comprises 3% to 15% of the above-mentioned high-performance ecological enhancer for in-situ subgrade soil, 85% to 97% soil, and the moisture content is determined according to the soil moisture content. If the moisture content is low, water needs to be added to the optimal moisture content. If the in-situ soil moisture content is high, ecological enhancer can be added from 3% to 15% according to the actual situation.

[0051] As a preferred embodiment of the present invention, the soil is in-situ soil, which is sandy soil and / or silt. The reinforcing agent has the best solidification effect on sandy soil and silt. For high clay soil, the amount of quicklime and cementing material needs to be appropriately increased.

[0052] In a fourth aspect, the present invention provides a road emergency repair construction method, comprising the following steps:

[0053] Clean up the silt and loose material on site, and mix 85% to 97% of soil and 3% to 15% of the above-mentioned high-performance ecological enhancer for in-situ roadbed soil according to the mass percentage to obtain a mixture.

[0054] Spread the mixture to the predetermined thickness in the construction area and level it;

[0055] After compaction and curing, the road reaches the required strength for traffic within 4-6 hours, thus obtaining the road surface.

[0056] As a preferred embodiment of the present invention, a site survey is conducted before construction to determine the extent of water damage, soil type, and estimate the amount of reinforcing agent and soil to be used.

[0057] As a preferred embodiment of the present invention, the soil is undisturbed soil or alternative soil.

[0058] As a preferred embodiment of the present invention, the mixing method of the soil and the reinforcing agent adopts the road mixing method or the plant mixing method. The detailed steps of the road mixing method are as follows: use a soil-ash mixer or rotary tiller to evenly spread the reinforcing agent on the soil, perform dry mixing 2-3 times, and then sprinkle water to perform wet mixing 2-3 times until the mixture is uniform. The detailed steps of the plant mixing method are as follows: according to the mass percentage, the soil and the reinforcing agent are centrally mixed in a concrete mixing plant, which makes the quality more controllable.

[0059] As a preferred embodiment of the present invention, compaction is carried out by using a road roller to compact the road to a degree of not less than 98%.

[0060] As a preferred embodiment of the present invention, the curing conditions are curing at 15℃~35℃.

[0061] As a preferred embodiment of the present invention, the compressive strength of the road is not less than 2 MPa.

[0062] As a preferred embodiment of the present invention, the unconfined compressive strength of the road during 4 hours is greater than 0.5 MPa. More preferably, the unconfined compressive strength of the road during 4 hours is greater than 0.6 MPa.

[0063] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0064] 1. This invention provides a high-performance ecological enhancer for in-situ roadbed soil, which effectively combines the advantages of sulfoaluminate cement and silicate cement, and incorporates other components. It features rapid setting and fast early strength development, and can controllably enhance soil strength to meet the requirements for compressive strength and durability in engineering construction. At the same time, it shortens the construction cycle and meets the need for rapid traffic opening in 4-6 hours in emergency repair scenarios.

[0065] 2. This invention provides a high-performance ecological reinforcing agent for in-situ soil of roadbeds. It utilizes waste materials, meets the requirements of ecological construction, and has a short setting time. The solidified soil treated with it has rapid strength development and is particularly suitable for the treatment of soft soil foundations. It is also suitable for the reinforcement and treatment of soft soil in low-temperature environments. It can give the solidified soil better mechanical properties and durability, thereby improving the stability of the roadbed and increasing the convenience of construction. Attached Figure Description

[0066] Figure 1 This is a record of the pressure test block process in Test Example 2.

[0067] Figure 2 The specimens in Test Example 3, which were cured for 18 hours with a 7% admixture and then soaked in water for about 12-15 hours, showed disintegration patterns. Detailed Implementation

[0068] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0069] In the following embodiments, the silicone powder used is porous silicone powder, the polymer reinforcing agent is VAE adhesive powder, and the sodium sulfate is anhydrous sodium sulfate.

[0070] Example 1

[0071] This embodiment provides a high-performance ecological enhancer for in-situ soil of roadbed, comprising the following raw materials by mass percentage: 81.3% sulfoaluminate cement; 10% silicate cement; 5% quicklime; 1% sodium silicate; 0.5% lithium carbonate; 1% polymer enhancer; 1% organosilicon powder; and 0.2% sodium lignosulfonate.

[0072] Example 2

[0073] This embodiment provides a high-performance ecological enhancer for in-situ soil of roadbed, comprising the following raw materials by mass percentage: 45% sulfoaluminate cement; 20% silicate cement; 5% quicklime; 10% fly ash; 13.8% slag powder; 3% sodium sulfate; 1% sodium silicate; 1% polymer enhancer; 1% organosilicon powder; and 0.2% sodium lignosulfonate.

[0074] Example 3

[0075] This embodiment provides a high-performance ecological enhancer for in-situ soil of roadbed, comprising the following raw materials by mass percentage: 50% sulfoaluminate cement; 15% silicate cement; 5% quicklime; 10% fly ash; 3.65% silica fume; 10% slag powder; 3% sodium sulfate; 1% sodium silicate; 0.2% lithium carbonate; 1% polymer enhancer; 1% organosilicon powder; and 0.15% sodium lignosulfonate.

[0076] Example 4

[0077] This embodiment provides a high-performance ecological enhancer for in-situ soil of roadbed, comprising the following raw materials by mass percentage: 60% sulfoaluminate cement; 20% silicate cement; 5% quicklime; 3% silica fume; 6.4% slag powder; 3% sodium sulfate; 0.5% lithium carbonate; 1% polymer enhancer; 1% organosilicon powder; and 0.1% sodium lignosulfonate.

[0078] Example 5

[0079] This embodiment provides a high-performance ecological enhancer for in-situ soil of roadbed, comprising the following raw materials by mass percentage: 50% sulfoaluminate cement; 10% silicate cement; 3% quicklime; 10% fly ash; 5% silica fume; 13.35% slag powder; 5% sodium sulfate; 1% sodium silicate; 0.5% lithium carbonate; 1% polymer enhancer; 1% organosilicon powder; and 0.15% sodium lignosulfonate.

[0080] Example 6

[0081] This embodiment provides a high-performance ecological enhancer for in-situ soil of roadbed, comprising the following raw materials by mass percentage: 55% sulfoaluminate cement; 10% silicate cement; 3% quicklime; 5% fly ash; 4.2% silica fume; 15% slag powder; 5% sodium sulfate; 1% sodium silicate; 0.6% lithium carbonate; 1% polymer enhancer; and 0.2% sodium lignosulfonate.

[0082] The raw materials used in the eco-enhancing agents of Examples 1-6 are shown in Table 1 below.

[0083] Table 1. Raw materials (%) for Examples 1-6

[0084]

[0085] Comparative Example 1

[0086] This comparative example provides a reinforcing agent comprising the following raw materials in weight percentages: 35% sulfoaluminate cement; 28% silicate cement; 5% quicklime; 5% fly ash; 4.2% silica fume; 15% slag powder; 5% sodium sulfate; 1% sodium silicate; 0.6% lithium carbonate; 1% polymer reinforcing agent; and 0.2% sodium lignosulfonate.

[0087] Comparative Example 2

[0088] This comparative example provides a reinforcing agent comprising the following raw materials in weight percentages: 58% sulfoaluminate cement; 5% silicate cement; 5% quicklime; 5% fly ash; 4.2% silica fume; 15% slag powder; 5% sodium sulfate; 1% sodium silicate; 0.6% lithium carbonate; 1% polymer reinforcing agent; and 0.2% sodium lignosulfonate.

[0089] Comparative Example 3

[0090] This comparative example provides a reinforcing agent comprising the following raw materials in weight percentages: 56% sulfoaluminate cement; 12% silicate cement; 5% fly ash; 4.2% silica fume; 15% slag powder; 5% sodium sulfate; 1% sodium silicate; 0.6% lithium carbonate; 1% polymer reinforcing agent; and 0.2% sodium lignosulfonate.

[0091] Comparative Example 4

[0092] This comparative example provides a reinforcing agent comprising the following raw materials by weight percentage: 56% sulfoaluminate cement; 10.2% silicate cement; 3% quicklime; 5% fly ash; 4.2% silica fume; 15% slag powder; 5% sodium sulfate; 1% sodium silicate; and 0.6% lithium carbonate.

[0093] Comparative Example 5

[0094] This comparative example provides a reinforcing agent comprising the following raw materials in weight percentages: 90% sulfoaluminate cement; 5% silicate cement; 3% quicklime; 0.5% sodium silicate; 0.2% lithium carbonate; 0.5% polymer reinforcing agent; 0.5% organosilicon powder; and 0.2% sodium lignosulfonate.

[0095] Test Example 1

[0096] The reinforcing agents of Examples 1-6 and Comparative Examples 1-5 were weighed according to the mass percentage. The raw materials were put into a mixing device with a mixing rate of 150-300 r / min and mixed evenly to obtain the reinforcing agent. Then, the soil and ecological reinforcing agent were stirred and mixed evenly according to the mass percentage to obtain the mixture. The reinforcing agent was mixed at a ratio of 7%. The soil was selected from a certain area in Xi'an. The soil in this area was tested according to JTG 3430-2020 "Specifications for Geotechnical Testing of Highways". The results showed that the maximum dry density was 1.83, the moisture content was 14.7%, the liquid limit was 42.4%, the plasticity index was 19.3, and the plastic limit index was 23.2. Standard cylindrical specimens (Φ50mm × H50mm) were prepared from the above mixture using the static pressing method. Unconfined compressive strength tests were conducted according to the test methods in standard JTG 3441-2024 "Test Procedures for Inorganic Bonded Stabilized Materials in Highway Engineering". The CBR (Contractual Burden Ratio) was also tested. The CBR test method is: when the penetration reaches 2.5mm, the ratio of the unit pressure to the standard load strength of standard crushed stone with the same penetration is calculated. Figure 1 As shown in Table 2, the test results are as follows.

[0097] For rapid emergency repair roads whose roadbeds have been damaged by water damage, collapse, or other reasons, the standard for road opening to traffic is a resilient modulus of 50 MPa, which is equivalent to a compressive strength of 0.3-0.5 MPa.

[0098] Table 2. Test data of reinforcing agents in Examples 1-6 and Comparative Examples 1-5

[0099]

[0100] The specimens prepared using the reinforcing agents of Examples 1-6 had an initial setting time of 4-14 min and a final setting time of 8-20 min, demonstrating the advantages of rapid setting and early strength. At 4 hours, the unconfined compressive strength ranged from 0.65-1.3 MPa, all exceeding 0.5 MPa, and the CBR load-bearing ratio was 45.9-167.1, meeting the core requirement of reopening roads to traffic within 4-6 hours after emergency repairs. All specimens showed no pitting or honeycombing and exhibited good integrity. Type I (rapid-setting type) of Example 1 was particularly outstanding under various data conditions. The performance of the reinforcing agent of this invention depends on the synergistic effect of sulfoaluminate cement (45%-85%), silicate cement (8%-25%), quicklime (3%-5%), and functional admixtures. The specimens of Comparative Examples 1-5 had an initial setting time of 10-15 min and a final setting time of 30-35 min, which is greater than that of the Examples. The unconfined compressive strength at 4 h was all <0.5 MPa, which could not meet the requirements for emergency traffic opening. The reason is that the formula deviates from the scope of this invention, which destroys the synergistic effect between the components and disrupts the balance of early strength, rapid setting, and durability, resulting in the failure to meet the early strength required for emergency repairs.

[0101] Test Example 2

[0102] Under the premise that the unconfined compressive strength meets the requirements, the reinforcing agent formulations of Examples 1 and 6 were selected. The soil moisture content and the dosage of reinforcing agent were changed. For the reinforcing agent formulations of Examples 1 and 6, the soil moisture content was changed to 20%-25% and 12%-15%, respectively, and the dosage of reinforcing agent was 7%, 9%, and 11%, respectively.

[0103] The above formula was further tested to produce specimens. The reinforcing agent and soil were mixed in a specific ratio to obtain a mixture. The soil was tested according to JTG 3430-2020 "Specifications for Geotechnical Testing of Highways," yielding a maximum dry density of 1.83, a moisture content of 14.7%, a liquid limit of 42.4%, a plasticity index of 23.2, and a plastic limit of 19.3%. Standard cylindrical specimens (Φ50mm × H50mm) were fabricated from the mixture using the static pressing method. The prepared specimens were tested for unconfined compressive strength according to the test methods in standard JTG 3441-2024 "Test Procedures for Inorganic Bonded Stabilized Materials for Highway Engineering." The curing strength effect of the reinforcing agent at different curing times was tested, and the water stability coefficient was tested according to the test methods in standard CJ / T 486-2015 "Soil Stabilizing Admixtures." Figure 2 As shown, the test results are shown in Tables 3-8.

[0104] Table 3 Unconfined compressive strength data of different dosages of reinforcing agent in Example 1 (moisture content 20%-25%)

[0105]

[0106] Table 4. Unconfined compressive strength data of different dosages of reinforcing agent in Example 1 (moisture content 12%-15%)

[0107]

[0108] Table 5. Water stability coefficient data for different dosages of reinforcing agent in Example 1 (moisture content 12%-15%)

[0109]

[0110] Table 6. Unconfined compressive strength data of different dosages of reinforcing agent in Example 6 (moisture content 20%-25%)

[0111]

[0112] Table 7. Unconfined compressive strength data of different dosages of reinforcing agent in Example 6 (moisture content 12%-15%)

[0113]

[0114] Table 8. Water stability coefficient data for different dosages of reinforcing agent in Example 6 (moisture content 12%-15%)

[0115]

[0116] The above data shows that when the moisture content is 20%-25%, the unconfined compressive strength of the specimens using the reinforcing agent of Example 1 is relatively low. At dosages of 7%, 9%, and 11%, the unconfined compressive strength after 4-6 hours is no greater than 0.5 MPa, with a slight increase in strength with increasing age. When the moisture content is 12%-15%, the unconfined compressive strength after 4 hours is 1.3 MPa at a dosage of 7%, 1.51 MPa at a dosage of 9%, and 1.93 MPa at a dosage of 11%. The strength increase is more significant with increasing dosage and gradually increases with age. This indicates that the optimal soil moisture content range for using the reinforcing agent of Example 1 is 0-15%.

[0117] When the moisture content is 20%-25%, the unconfined compressive strength of the specimens using the reinforcing agent of Example 6 is relatively low. At dosages of 7%, 9%, and 11%, the unconfined compressive strength after 4-6 hours is no greater than 0.5 MPa. When the moisture content is 12%-15%, the unconfined compressive strength after 4 hours is 0.91 MPa at a dosage of 7%, 1.04 MPa at a dosage of 9%, and 2.04 MPa at a dosage of 11%. The strength increase is more significant with increasing dosage and gradually increases with age. In the formulation of Example 6, the specimens disintegrate with increasing saturation time. This indicates that the optimal soil moisture content range for using the reinforcing agent of Example 6 is 0-15%.

[0118] Example 7

[0119] This embodiment provides a road emergency repair construction method, including the following steps:

[0120] Clean up the silt and loose material on site, and roughly level and crush the original soil or the transported replacement soil;

[0121] Mix 85%–97% soil and 3%–15% of the above-mentioned high-performance ecological enhancer for in-situ soil of roadbed according to the mass percentage to obtain a mixture.

[0122] Spread the mixture to the predetermined thickness in the construction area and level it using a grader or manually.

[0123] Use a road roller (smooth drum or vibratory roller) to compact the surface in a timely manner to achieve the required compaction degree. After curing, the road will reach the strength required for traffic in 4-6 hours, and then it can be opened to light traffic.

[0124] The amount of water added during construction is crucial. The optimum moisture content is usually 1-2 percentage points higher than the soil's optimal moisture content. The total water content should ensure that the reinforcing agent slurry can evenly coat all soil particles and achieve the required compaction. It is generally controlled between 10% and 18% of the total material (soil + reinforcing agent), and needs to be determined by on-site testing.

[0125] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-performance ecological enhancer for in-situ soil of roadbed, characterized in that, The reinforcing agent comprises the following raw materials by mass percentage: Sulfoaluminate cement 75%~85%; Portland cement 8%~15%; 3%~5% quicklime; Sodium silicate 0.5%~1.5%; Lithium carbonate 0.3%~0.8%; Polymer reinforcing agent 1%~1.5%; the polymer reinforcing agent is VAE adhesive powder; The organosilicon powder is 0.8%~1.2%, and the organosilicon powder is a porous organosilicon powder, the main component of which is silane; Sodium lignosulfonate 0.1%~0.3%.

2. A high-performance ecological enhancer for in-situ soil of roadbed, characterized in that, The reinforcing agent comprises the following raw materials by mass percentage: Sulfoaluminate cement 45%~60%; Silicate cement 10%~20%; 3%~5% quicklime; Fly ash 0%~10%; Silica fume 0%~5%; Slag powder 5~15%; Sodium sulfate 3%~5%; Sodium silicate 1%~1.5%; Lithium carbonate 0.2%~0.6%; The polymer reinforcing agent is 0.5%~1.2%, and the polymer reinforcing agent is VAE adhesive powder; The organosilicon powder is 0.5%~1.2%, and the organosilicon powder is a porous organosilicon powder, the main component of which is silane; Sodium lignosulfonate 0.1%~0.2%.

3. The high-performance ecological enhancer for in-situ soil of roadbed according to claim 2, characterized in that, The mass ratio of sulfoaluminate cement, silicate cement and quicklime is 12~19:3~4:

1.

4. The high-performance ecological enhancer for in-situ soil of roadbed according to claim 1 or 2, characterized in that, The reinforcing agent also includes 1% to 10% steel slag powder; And / or the reinforcing agent may further include 0.05% to 0.2% fiber powder.

5. A method for preparing a high-performance ecological enhancer for in-situ roadbed soil according to any one of claims 1-4, characterized in that, The preparation method is as follows: after weighing the raw materials according to the mass percentage, put the raw materials into a mixing device with a mixing rate of 100-1000 r / min and mix them evenly to obtain the reinforcing agent.

6. A type of early-strength solidified soil, characterized in that, By weight percentage, it includes 3% to 15% of the high-performance ecological enhancer for in-situ soil of roadbed as described in any one of claims 1-4, and 85% to 97% of the soil.

7. The early-strength solidified soil according to claim 6, characterized in that, The soil is sandy soil and / or silty soil.

8. A method for emergency road repair, characterized in that, Includes the following steps: Clean up the silt and loose material at the site, and mix 85% to 97% of the soil and 3% to 15% of the high-performance ecological enhancer for in-situ soil of the roadbed as described in any one of claims 1-4 according to the mass percentage to obtain the mixture; Spread the mixture to the predetermined thickness in the construction area and level it; After compaction and curing, the road reaches the required strength for traffic within 4-6 hours, thus obtaining the road surface.

9. The road emergency repair construction method according to claim 8, characterized in that, The soil in question is either undisturbed soil or substitute soil.

10. The road emergency repair construction method according to claim 8, characterized in that, The soil and the reinforcing agent are mixed using either road mixing or plant mixing. The detailed steps of road mixing are as follows: use a soil-ash mixer or rotary tiller to evenly spread the reinforcing agent on the soil, dry mix 2-3 times, then sprinkle water and wet mix 2-3 times until the mixture is uniform. The detailed steps of plant mixing are as follows: mix the soil and the reinforcing agent centrally at a concrete mixing plant according to the mass percentage.

11. The road emergency repair construction method according to claim 8, characterized in that, Compaction is the process of rolling with road rollers until the compaction degree is not less than 98%.

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