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CN-121537187-B - Roadbed in-situ soil high-performance ecological reinforcing agent, preparation method and construction method

CN121537187BCN 121537187 BCN121537187 BCN 121537187BCN-121537187-B

Abstract

The invention relates to the field of roadbed soil treatment, in particular to a roadbed in-situ soil high-performance ecological reinforcing agent, a preparation method and a construction method, wherein the reinforcing agent comprises, by mass, 45% -85% of sulphoaluminate cement, 8% -25% of silicate cement, 3% -5% of quicklime, 0% -15% of fly ash, 0% -8% of silica fume, 0% -15% of slag micropowder, 3% -5% of sodium sulfate, 0% -2% of sodium silicate, 0% -0.8% of lithium carbonate, 0% -1.5% of a polymer reinforcing agent, 0% -1.5% of organic silicon powder and 0.1% -0.3% of sodium lignin sulfonate. The reinforcing agent effectively combines the advantages of sulphoaluminate cement and silicate cement, combines other components, has the characteristics of rapid setting, rapid early strength development and the like, can regulate and control the soil strength, meets the requirements on compressive strength and durability in engineering construction, shortens the construction period, and meets the requirement of 4-6h for rapid traffic in an emergency repair scene.

Inventors

  • YAN YAPENG
  • Chen tuanjie
  • CAO HAIBO
  • ZHANG WENJUAN
  • Han Raorao
  • WANG DIANYU
  • LIU PENG
  • MIAO SIYU
  • Qu teng

Assignees

  • 中交第一公路勘察设计研究院有限公司
  • 中交瑞通路桥养护科技有限公司
  • 西安赛特实业有限公司

Dates

Publication Date
20260508
Application Date
20260119

Claims (11)

  1. 1. The roadbed in-situ soil high-performance ecological reinforcing agent is characterized by comprising the following raw materials in percentage by mass: 75% -85% of sulphoaluminate cement; 8% -15% of Portland cement; 3% -5% of quicklime; 0.5% -1.5% of sodium silicate; 0.3% -0.8% of lithium carbonate; 1% -1.5% of polymer reinforcing agent, wherein the polymer reinforcing agent is VAE rubber powder; 0.8% -1.2% of organic silicon powder, wherein the organic silicon powder is porous organic silicon powder, and the main component is silane; 0.1% -0.3% of sodium lignin sulfonate.
  2. 2. The roadbed in-situ soil high-performance ecological reinforcing agent is characterized by comprising the following raw materials in percentage by mass: 45% -60% of sulphoaluminate cement; 10% -20% of Portland cement; 3% -5% of quicklime; 0% -10% of fly ash; 0% -5% of silica fume; 5-15% of slag micropowder; 3% -5% of sodium sulfate; 1% -1.5% of sodium silicate; 0.2% -0.6% of lithium carbonate; 0.5% -1.2% of polymer reinforcing agent, wherein the polymer reinforcing agent is VAE rubber powder; 0.5% -1.2% of organic silicon powder, wherein the organic silicon powder is porous organic silicon powder, and the main component is silane; 0.1% -0.2% of sodium lignin sulfonate.
  3. 3. The roadbed in-situ soil high-performance ecological enhancer of claim 2 is characterized in that the mass ratio of the sulphoaluminate cement to the silicate cement to the quicklime is 12-19:3-4:1.
  4. 4. The roadbed in-situ soil high-performance ecological enhancer according to claim 1 or 2, wherein the enhancer further comprises 1% -10% of steel slag micro powder; and/or the reinforcing agent further comprises 0.05% -0.2% of fiber powder.
  5. 5. A preparation method of the roadbed in-situ soil high-performance ecological reinforcing agent according to any one of claims 1 to 4 is characterized in that raw materials are weighed according to mass percent and then are put into mixing equipment with the mixing rate of 100-1000 r/min to be mixed uniformly, and the reinforcing agent is obtained.
  6. 6. The early-strength solidified soil is characterized by comprising 3% -15% of the roadbed in-situ soil high-performance ecological enhancer and 85% -97% of soil according to mass percent.
  7. 7. The early strength solidified soil of claim 6, wherein the soil is sandy soil and/or silty soil.
  8. 8. The road emergency repair construction method is characterized by comprising the following steps of: Cleaning on-site sludge and loose matters, and uniformly stirring and mixing 85% -97% of soil and 3% -15% of the roadbed in-situ soil high-performance ecological enhancer according to any one of claims 1-4 according to mass percent to obtain a mixture; Spreading the mixture to a preset thickness in a construction area, and leveling; Compacting and curing to obtain the road with 4-6h strength reaching the traffic requirement.
  9. 9. The road emergency repair construction method according to claim 8, wherein the soil is undisturbed soil or alternative soil.
  10. 10. The road emergency repair construction method according to claim 8, wherein the mixing method of the soil and the reinforcing agent is a road mixing method or a plant mixing method, the road mixing method comprises the following detailed steps of uniformly spreading the reinforcing agent on the soil by using a lime soil mixer or a rotary cultivator, carrying out dry mixing for 2-3 times, then carrying out wet mixing for 2-3 times by sprinkling water until the soil and the reinforcing agent are uniformly mixed, and the plant mixing method comprises the detailed steps of intensively mixing the soil and the reinforcing agent by using a concrete mixing station according to mass percent.
  11. 11. The method of claim 8, wherein the compacting is by rolling with a road rolling device until the degree of compaction is not less than 98%.

Description

Roadbed in-situ soil high-performance ecological reinforcing agent, preparation method and construction method Technical Field The invention relates to the technical field of roadbed soil treatment, in particular to a roadbed in-situ soil high-performance ecological enhancer, a preparation method and a construction method. Background The soil solidification technology is used as a novel technology capable of optimizing and improving soil efficiency, improving construction efficiency and improving economical efficiency and durability of a construction road section, and is applied to road engineering construction. The mechanism for solidifying and increasing the strength of the soil is to use a soil reinforcing agent. The soil reinforcing agent is a novel energy-saving environment-friendly engineering material synthesized by various inorganic and organic materials and used for curing various kinds of soil, and the engineering properties of the soil are changed through physical and chemical actions. The road emergency repair has extremely high requirements on early strength, construction simplicity and environmental adaptability. Thus, the formulation of the reinforcing agent is generally based on silicate-based, thioaluminate-based, and is compounded with other functional additives. While the existing soil curing technology realizes the improvement of soil engineering performance through the reinforcing agent, the existing reinforcing agent still has the defects that firstly, part of products adopt non-environment-friendly raw materials, which is contrary to the ecological construction concept, secondly, the early strength development is slow, the requirement of 4-6h quick traffic in emergency repair scenes is difficult to meet, thirdly, the adaptability to clay, sandy soil and other different types of in-situ soil is poor, and the curing effect is easily influenced by soil properties and is unstable. Therefore, the natural soil body performance needs to be effectively improved in the road emergency repair, and a roadbed in-situ soil high-performance ecological enhancer needs to be developed so as to achieve the aims of ecological environmental protection and rapid standard reaching of early strength. Disclosure of Invention The invention aims to solve the problems that the early strength of an enhancer used in the prior art is slow to develop and is difficult to meet the requirement of 4-6h quick traffic in an emergency repair scene, and provides a roadbed in-situ soil high-performance ecological enhancer, a preparation method and a construction method, which realize ecological environmental protection, quick achievement of the early strength, broad-spectrum soil adaptability and controllable cost. In a first aspect, the invention provides a roadbed in-situ soil high-performance ecological enhancer, which comprises the following raw materials in percentage by mass: 45% -85% of sulphoaluminate cement; silicate cement 8% -25%; 3% -5% of quicklime; 0% -15% of fly ash; 0% -8% of silica fume; Slag micropowder 0% -15%; 3% -5% of sodium sulfate; sodium silicate 0% -2%; 0% -0.8% of lithium carbonate; 0% -1.5% of polymer reinforcing agent; 0% -1.5% of organic silicon powder; 0.1% -0.3% of sodium lignin sulfonate. In the technical scheme, the solidified soil is mixed with the reinforcing agent to form a hardened body with high strength and water erosion resistance in a short time by using soil (such as sandy soil, silt soil, clay and the like) which can be obtained locally, so that quick, low-cost and efficient emergency communication is realized. The Portland cement (OPC) technology is mature, wide in source and relatively low in cost, can provide stable later-stage strength and durability, and is a basic guarantee of strength. However, portland cement has relatively slow early strength development, and generally has crack resistance and is sensitive to low-temperature environments. The sulphoaluminate cement (SAC) has the characteristic of quick setting and hardening, the strength can be generated within 3 hours, the strength within 24 hours can reach 3-5 times of OPC, and the emergency requirement is perfectly met. Meanwhile, the sulphoaluminate hydration product is compact, has strong permeation resistance, is favorable for resisting water scouring, can compensate partial shrinkage, reduces cracking risk, can be normally hydrated and hardened below 0 ℃, and has extremely strong environmental adaptability and low temperature resistance. The silicate cement and the sulphoaluminate cement are used as main cementing materials for compounding, so that complementary advantages can be realized, SAC provides door opening red, quick passing of emergency vehicles is guaranteed, OPC provides lasting guarantee, continuous and stable service of roads in the later period is guaranteed, and long-term performance of an enhancer system is guaranteed. The quick lime (CaO) provides an alkaline environment, stimulates the activity of