Search

CN-121990804-A - Fan blade regenerated fiber-based high-solid-content waste low-carbon concrete and preparation method thereof

CN121990804ACN 121990804 ACN121990804 ACN 121990804ACN-121990804-A

Abstract

The invention belongs to the technical field of building materials, and particularly relates to a fan blade regenerated fiber-based high-solid waste low-carbon concrete and a preparation method thereof, wherein the fan blade regenerated fiber-based high-solid waste low-carbon concrete comprises, by weight, 0.9-1.1 parts of alkali excitation active precursor, 0.4-0.8 parts of iron tailing sand, 0-1.1 parts of natural sand, 1.9-2.4 parts of regenerated aggregate, 0.15-0.20 parts of composite alkali activator, 0.015-0.020 parts of fan blade regenerated glass fiber, 0.001-0.003 parts of retarder and 0.35-0.45 parts of water, and the alkali excitation active precursor is granulated blast furnace slag powder. The concrete mixture obtained by the invention has good workability, the 28-day compressive strength is more than 40 MPa, the drying shrinkage is reduced by 30% -50% compared with the traditional alkali-activated concrete, and no additional maintenance measures are needed, so that the concrete mixture is particularly suitable for prefabricated components such as curb, sleeper, manhole cover and the like, and a practical and feasible technical path is provided for the high-valued and large-scale utilization of solid wastes in bulk industry.

Inventors

  • WU BEI
  • PANG WEIXIANG
  • WANG FANG
  • XU XING
  • LI MING
  • WANG CHENLI
  • LI YANG
  • PAN YIRU
  • Mikla Sawatsky

Assignees

  • 宝业集团股份有限公司

Dates

Publication Date
20260508
Application Date
20260204

Claims (10)

  1. 1. The regenerated fiber-based high-solid waste low-carbon concrete for the fan blade is characterized by comprising the following raw materials in parts by weight: 0.9-1.1 parts of alkali excitation active precursor; 0.4-0.8 part of iron tailing sand; 0-1.1 parts of natural sand; 1.9-2.4 parts of recycled aggregate; 0.15-0.20 part of compound alkali excitant; 0.015-0.020 parts of fan blade regenerated glass fiber; 0.001-0.003 part of retarder; 0.35-0.45 parts of water; The composite alkali excitant consists of a main excitation component and an auxiliary excitation component, wherein the main excitation component is a mixture of sodium silicate solution with the modulus of 0.9-1.1 and solid sodium hydroxide, and the auxiliary excitation component is soluble aluminum salt, and the dosage of the auxiliary excitation component accounts for 1.5-3.0% of the total mass of the composite alkali excitant.
  2. 2. The high solid waste alkali-activated concrete of claim 1, wherein the natural sand is used in an amount of 0 parts, namely, the fine aggregate of the concrete is composed of iron tailings.
  3. 3. The high solid waste alkali-activated concrete of claim 1, wherein the granulated blast furnace slag powder has a specific surface area of 390-420 m2/kg and an activity index of not less than 95%.
  4. 4. The fan blade regenerated fiber-based high-solid waste low-carbon concrete of claim 1, wherein the mass percentage of chemical components of the granulated blast furnace slag powder is ：CaO: 35～55 wt%,SiO 2 ：35～45%,Al 2 O 3 ：3～15%,MgO：1～10%,SO 3 ：0.2～2.5%;Fe 2 O 3 ：0.2～0.7,TiO 2 ：0～0.8%,K 2 O：0.2～0.5%,Na 2 O:0～0.7%, and the balance is impurities.
  5. 5. The regenerated fiber-based high-solid waste low-carbon concrete for fan blades according to claim 1, wherein the fineness modulus of the iron tailing sand is 2.6-3.0, the apparent density is 2800-2900kg/m 3 , and the bulk density is 1600-1650kg/m 3 .
  6. 6. The regenerated fiber-based high-solid-content low-carbon concrete for fan blades according to claim 5, wherein the iron tailing chemical components comprise SiO 2 -40 wt%, caO 12-18 wt% and TFe 6-10 wt%.
  7. 7. The fan blade regenerated fiber-based high-solid waste low-carbon concrete according to claim 1, wherein the length of the fan blade regenerated glass fiber is 12-25mm, the diameter is 10-15 μm, the fan blade regenerated glass fiber is treated by a surface coupling agent, the breaking strength is 1700-2500MPa, the elastic modulus is 65-72GPa, and the apparent density is 2400-2600kg/m 3 .
  8. 8. The fan blade regenerated fiber-based high-solid waste low-carbon concrete according to claim 1, wherein the molar ratio of Na 2 O to SiO 2 in the sodium silicate solution is 2.0, and the purity of the solid sodium hydroxide is more than 98% by adopting chemical pure grade sodium hydroxide.
  9. 9. The fan blade regenerated fiber-based high solids waste low carbon concrete of claim 1 wherein the soluble aluminum salt is aluminum sulfate or sodium aluminate or aluminum nitrate.
  10. 10. A method for preparing the fan blade regenerated fiber-based high-solid-content low-carbon concrete according to claim 1, which is characterized by comprising the following steps: (1) Preparing a composite activator, namely dissolving solid sodium hydroxide in part of mixing water, cooling to room temperature, adding sodium silicate solution, adding soluble aluminum salt, stirring until the sodium hydroxide is completely dissolved, and sealing and aging for 12-24 hours to obtain the composite alkali activator; (2) Dry mixing, namely adding granulated blast furnace slag powder, iron tailing sand, recycled aggregate and natural sand into a stirrer, and dry mixing for 2-3 minutes until the mixture is in a uniform state; (3) Wet mixing, namely adding the composite alkali excitant prepared in the step (1) and the rest mixing water into the dry mixed material, and stirring for 3-4 minutes until the mixture is in a uniform state; (4) And (3) fiber blending, namely uniformly scattering regenerated glass fibers of the fan blades in 2-3 batches under the stirring state, and continuing stirring for 1-2 minutes until the fibers are uniformly dispersed and free of agglomerations, so that the high-solid waste alkali-activated concrete mixture is obtained.

Description

Fan blade regenerated fiber-based high-solid-content waste low-carbon concrete and preparation method thereof Technical Field The invention belongs to the technical field of building materials, and particularly relates to a fan blade regenerated fiber-based high-solid-content low-carbon concrete and a preparation method thereof. Background With the deep advancement of the "two carbon" strategy, the construction industry is in great demand for the development of low-carbon and even zero-carbon gel material systems as an important field of resource consumption and carbon emission. Alkali-activated gelling materials are considered ideal substitutes for conventional portland cements because they do not require calcination and can fully utilize industrial solid wastes (e.g., granulated blast furnace slag). However, the existing alkali-activated concrete still faces two core bottlenecks in engineering application, namely, firstly, poor volume stability, obvious chemical shrinkage and drying shrinkage caused by strong alkali-activated reaction, extremely easy initiation of early cracking and serious influence on structural durability, and secondly, single solid waste utilization path and limited doping amount, most researches still rely on natural sand stone as aggregate, and the replacement of all-chain solid waste from cementing materials to aggregates cannot be realized. In recent years, iron tailings are taken as typical large-scale industrial solid waste, the annual emission is huge, and the physicochemical properties (rich in SiO 2, caO and certain Fe 2O3) of the iron tailings theoretically have the potential of being used as fine aggregate and even potential active components, but the iron tailings are directly used for concrete due to poor grain composition, rough surface and potential expansion risks, so that the workability is easy to be reduced and the volume is unstable. Meanwhile, harmless treatment of retired fan blades (mainly comprising epoxy resin-based glass fiber composite materials) has become an emerging environmental-friendly problem, and recycled glass fibers have the advantages of high strength and high modulus, but are difficult to effectively disperse in a cement-based or alkali-excited matrix and exert reinforcing and toughening effects due to the characteristics of surface inertia and easy agglomeration. In view of this, the present invention has been proposed. Disclosure of Invention The invention provides high-solid waste low-carbon concrete based on iron tailing sand and regenerated glass fibers of fan blades and a preparation method thereof, aiming at solving the technical problems in the prior art. In order to achieve the above purpose, the present invention adopts the following technical scheme: the regenerated fiber-based high-solid waste low-carbon concrete for the fan blade comprises the following raw materials in parts by weight: 0.9-1.1 parts of alkali excitation active precursor; 0.4-0.8 part of iron tailing sand; 0-1.1 parts of natural sand; 1.9-2.4 parts of recycled aggregate; 0.15-0.20 part of compound alkali excitant; 0.015-0.020 parts of fan blade regenerated glass fiber; 0.001-0.003 part of retarder; 0.35-0.45 parts of water; The composite alkali excitant consists of a main excitation component and an auxiliary excitation component, wherein the main excitation component is a mixture of sodium silicate solution with the modulus of 0.9-1.1 and solid sodium hydroxide, and the auxiliary excitation component is soluble aluminum salt, and the dosage of the auxiliary excitation component accounts for 1.5-3.0% of the total mass of the composite alkali excitant. The natural sand is used in an amount of 0 part, namely, the fine aggregate of the concrete is composed of iron tailing sand. The specific surface area of the granulated blast furnace slag powder is 390-420 m2/kg, and the activity index is not lower than 95%. The granulated blast furnace slag powder comprises the following chemical components in percentage by mass ：CaO: 35～55 wt%,SiO2：35～45%,Al2O3：3～15%,MgO：1～10%,SO3：0.2～2.5%;Fe2O3：0.2～0.7,TiO2：0～0.8%,K2O：0.2～0.5%,Na2O:0～0.7%, and the balance of impurities. The fineness modulus of the iron tailing sand is 2.6-3.0, the apparent density is 2800-2900kg/m 3, and the bulk density is 1600-1650kg/m 3. The iron tailing sand comprises the chemical components of SiO 2 -40 wt%, caO 12-18 wt% and TFe 6-10 wt%. The regenerated glass fiber of the fan blade has the length of 12-25mm, the diameter of 10-15 mu m, the breaking strength of 1700-2500MPa, the elastic modulus of 65-72GPa and the apparent density of 2400-2600kg/m 3. The molar ratio of Na 2 O to SiO 2 in the sodium silicate solution is 2.0, and the purity of the solid sodium hydroxide is more than 98% by adopting chemical pure sodium hydroxide. The soluble aluminum salt is aluminum sulfate or sodium aluminate or aluminum nitrate. A preparation method of fan blade regenerated fiber-based high-solid waste low-carbon concrete com