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CN-122010497-A - Road surface base layer mixture based on feldspar powder and preparation method thereof

CN122010497ACN 122010497 ACN122010497 ACN 122010497ACN-122010497-A

Abstract

The application provides a road surface base layer mixture based on feldspar powder and a preparation method thereof, and belongs to the technical field of road engineering materials. The pavement base layer mixture comprises feldspar powder, cement, fly ash, low liquid limit clay and water. The application adopts feldspar powder to improve the strength and stability of the pavement base layer mixture. Meanwhile, the low liquid limit clay is added into the raw materials of the application to improve the cracking resistance and deformation resistance of the pavement base layer mixture. The application adjusts the raw material composition, greatly improves the addition amount of feldspar powder, and ensures that the mixture has good comprehensive performance.

Inventors

  • LIU FUMING
  • GAN YOUWEI
  • HE QINGDE
  • YANG ZHIPING
  • LV YIJUN

Assignees

  • 江西水利电力大学

Dates

Publication Date
20260512
Application Date
20260225

Claims (8)

  1. 1. The pavement base layer mixture based on the feldspar powder is characterized by comprising the following raw materials in parts by weight: 20-60 parts of feldspar powder, 8-10 parts of cement, 10-20 parts of fly ash and 10-80 parts of low liquid limit clay, wherein water is also added into the pavement base layer mixture, and the water is added according to the optimal water content of the pavement base layer mixture of 8-20%.
  2. 2. The feldspar powder-based pavement base mix of claim 1, wherein the feldspar powder is modified feldspar powder, and the preparation method of the modified feldspar powder comprises the following steps: calcining feldspar powder at 800-900 ℃ for 4-5 hours, then adjusting the pH value of an ethanol-water mixed solution of a silane coupling agent to 4-5 by acetic acid, stirring and hydrolyzing for 10-30 minutes to obtain a modified solution, finally placing the calcined feldspar powder in the modified solution, stirring and mixing for 10-30 minutes at 110-130 ℃, and drying to obtain the modified feldspar powder.
  3. 3. The feldspar powder-based pavement base mix of claim 2, wherein the feldspar powder comprises the following components in weight percent: 3% -5% of SiO 2 70%-80%、Al 2 O 3 15%-25%、Na 2 O 3%-5%,K 2 O and the balance of unavoidable impurities.
  4. 4. The feldspar powder-based pavement base mix of claim 1, wherein the cement is p.o 42.5 portland cement.
  5. 5. The feldspar powder-based pavement base mixture of claim 1, wherein the low liquid limit clay has a liquid limit of 40% -43%, a plastic limit of 20% -25%, a plasticity index of 20-22, a water content of 10% -15% and a dry density of 1.5-1.8g/cm 3 .
  6. 6. The method for preparing a feldspar powder-based pavement base mixture according to claim 1, comprising the following steps: S1, preparing raw materials, namely respectively weighing feldspar powder, cement, fly ash, low liquid limit clay and water according to the parts by weight; S2, mixing dry materials, namely putting the weighed feldspar powder, fly ash, cement and low-liquid-limit clay into a stirrer, and carrying out dry stirring until the materials are uniformly mixed to obtain a dry mixture; s3, wet mixing and forming, namely adding water into the dry mixture, and continuously and uniformly stirring to obtain a pavement base layer mixture; And S4, compacting and curing, namely paving, compacting and curing the pavement base layer mixture to obtain the pavement base layer mixture.
  7. 7. The method of claim 6, wherein the compacting in step S4 is performed under a static pressure of 1-5MPa.
  8. 8. The method for preparing a pavement base mixture based on feldspar powder according to claim 6, wherein the curing method in the step S4 is to cure for 6 days in an environment with humidity of more than or equal to 95% at 20+/-2 ℃, then to soak and cure for 1 day, and finally to perform natural curing.

Description

Road surface base layer mixture based on feldspar powder and preparation method thereof Technical Field The invention relates to the technical field of road engineering materials, in particular to a road surface base layer mixture based on feldspar powder and a preparation method thereof. Background Feldspar powder is mainly used in ceramic, glass and enamel industries. With the increase of new energy automobile companies on lithium battery demands, the yield of feldspar powder is far greater than consumption. How to treat the feldspar powder, avoiding polluting the environment, has become an urgent problem. The use of feldspar powder for building materials can consume it in large amounts. For example, patent CN119707331a discloses an active feldspar powder, a preparation method and its application in cement stabilized macadam mixture, the active feldspar powder is obtained by calcining, coarse grinding and fine grinding the feldspar powder, and is added into cement mixture, the mixture comprises 95.5-97.5 parts of aggregate, 2.5-3.5 parts of cement and 00.5-1.0 parts of auxiliary cementing material (active feldspar powder). The patent CN108503314A discloses a baking-free pavement brick added with hydrophobically modified glass fiber, which comprises the following raw materials of 10-15 parts of steel slag coarse aggregate, 40-50 parts of granite aggregate, 23-28 parts of cement, 20-25 parts of quartz sand, 10-16 parts of red mud, 3-6 parts of gangue powder, 4-7 parts of potassium feldspar powder, 7-10 parts of hydrophobically modified glass fiber, 1-3 parts of sealing curing agent, 2-4 parts of water reducer and 25-30 parts of water. In the above prior art, although feldspar powder is added to pavement materials, cement concrete is prepared, and cannot be used for preparing cement stabilized fine-grained soil. The cement stabilized fine-grained soil is different from cement concrete, is two kinds of materials applied to road engineering, is mainly used for base layers or subbase layers of roads at all levels, is especially suitable for areas lacking granules, and has good economical efficiency, and the cement concrete is widely used for structures such as pavement layers, bridges, culverts and the like which need high bearing and durability, and directly bears the abrasion of vehicles and environmental effects. The two materials are different in material composition, strength formation mechanism and performance characteristics. Cement concrete takes cement as a cementing material, common sand and stone as aggregates, water is added and stirred according to a designed mixing ratio, the cement consumption is higher (lean concrete is about 100-200 kg/m < 3 >, the common concrete is higher), fine sand (0.15-4.75 mm) is needed to be contained to fill gaps, a compact framework structure is formed through cement hydration reaction, the initial strength is high, the increase speed is high, the compressive strength can reach more than 20MPa, and the flexural tensile strength is high. And the cement concrete pays attention to workability (slump index and the like), ensures compactness through stirring, transportation, vibration and maintenance, has strict control on gradation and water cement ratio, has better anti-permeability, anti-freezing and anti-fatigue properties, but has large brittleness and poor adaptability to temperature change and load impact. The ‌ cement stabilized fine-grained soil is prepared by mixing fine-grained soil (such as cohesive soil and powdery soil) serving as main aggregate, a small amount of cement (the dosage is usually 4% -6%) and water, wherein the maximum grain diameter of the aggregate is smaller than 9.5mm and the grain content of the aggregate is smaller than 2.36mm and is not lower than 90%, the strength of the ‌ cement stabilized fine-grained soil mainly depends on the cementing effect of cement on soil grains and the compactness after compaction, the strength is slowly increased but continuously improved along with the age, the unconfined compressive strength is generally lower than 4.0MPa in 7 days, the tensile strength is lower and is easy to crack, the compactness (the base layer is required to be 93% -98% of heavy compaction standard) is required to be strictly controlled, the cement stabilized fine-grained soil is sensitive to water content in construction and is required to be rolled and molded near the optimal water content, the soil blocks are required to be crushed to be less than or equal to 15mm, the shrinkage crack tendency of the ‌ cement stabilized fine-grained soil is obvious in seepage resistance and frost resistance are relatively weak, and the abrasion resistance is insufficient when the cement stabilized fine-grained soil is directly exposed to a vehicle load. ‌ A In view of the fact that the grain size of the feldspar powder is similar to that of fine-grained soil and the cementing performance is lacked, the feldspar powder is used for replacing part of fin