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CN-122010438-A - Preparation method and application of composite solid waste-based cementing material

CN122010438ACN 122010438 ACN122010438 ACN 122010438ACN-122010438-A

Abstract

The invention relates to the technical field of mixed gel, in particular to a preparation method and application of a composite solid waste-based cementing material, and the preparation method comprises the following steps: grinding the dried granulated blast furnace slag, steel slag, fly ash, iron tailings, phosphogypsum and silicate cement, mixing to obtain a pretreated powder raw material, adding a modification exciting agent into the pretreated powder raw material, and stirring to obtain the composite solid waste-based cementing material. According to the invention, through the synergistic effect of the alkaline excitant and the sulfate excitant and the nucleation induction effect of the mineral modification admixture, the hydration process synchronization of multiple solid waste components is realized, the sulfate, ca 2+ and aluminum phases rapidly generate ettringite, the mineral admixture is used as crystal nucleus for the growth of hydration products, the hydration induction period is greatly shortened, the improvement of the early strength development rate and the continuous increase of the later strength of the material are realized, no collapse is realized, and the engineering pain points of the early strength deficiency or the later strength stagnation of the traditional solid waste base material are solved.

Inventors

  • WANG JUN
  • LI SHUFENG
  • GAO QI
  • Qiu Runze
  • PAN YONG
  • ZHU JUNGUANG
  • YAO BOYI
  • QIU SHIZHENG
  • QIU WENHUI
  • DAI ZHITAO
  • HOU PANFENG
  • HUANG CHUNSHUI
  • LOU RUIJIE
  • CHEN LIFANG
  • ZHANG ZHANFENG
  • TIAN ZIPING
  • WANG FANGTAO
  • DU YUN
  • YANG KE
  • YANG BINBIN
  • LI KAI

Assignees

  • 浙江交工集团股份有限公司
  • 许昌学院
  • 河南金诺混凝土有限公司
  • 河南省公路工程局集团有限公司
  • 中铁二局集团有限公司
  • 南宁铁路枢纽投资有限公司
  • 许昌金科资源再生股份有限公司
  • 河南省郑许高速公路有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. The preparation method of the composite solid waste-based cementing material is characterized by comprising the following steps of: S1, drying 40-50 parts of granulated blast furnace slag, 10-15 parts of steel slag, 10-15 parts of fly ash and 8-12 parts of iron tailings, adding 6-10 parts of phosphogypsum into lime, uniformly stirring, neutralizing until the pH value is 6-8, standing and drying; S2, grinding the dried granulated blast furnace slag, steel slag, fly ash, iron tailings, phosphogypsum and 10-15 parts of Portland cement to a specific surface area of 300-500m 2 /kg, and mixing to obtain a pretreated powder raw material; S3, adding 5-10 parts of modified activator into the pretreated powder raw material, and stirring to obtain a composite solid waste-based cementing material; wherein, the modification exciting agent in the step S3 is prepared by the following steps: S31, adding an alkaline excitant and a sulfate excitant into deionized water to prepare a basic synergistic excitant, adding a modified mineral admixture into the deionized water, uniformly stirring, and standing at a constant temperature to perform pre-activation treatment; S32, adding the pre-activated modified mineral admixture into a basic synergistic excitant, stirring, cooling to room temperature to obtain excitant slurry, adding a dispersing agent, stirring and adjusting the viscosity to 500-800 mPa.s, and curing at 20-25 ℃ to obtain a curing excitant; S33, vacuum drying the curing activator, and grinding to obtain modified activator powder.
  2. 2. The method for preparing a composite solid waste-based cementitious material as claimed in claim 1, wherein the modified mineral admixture in step S31 is prepared by: s311, uniformly mixing slag micropowder with sodium sulfate, adding a proper amount of deionized water, stirring to form paste, standing at normal temperature, calcining the paste slag micropowder at constant temperature, cooling to room temperature, grinding and sieving to obtain modified slag micropowder; S312, adding silica fume into hydrogen peroxide solution, adding nitric acid, stirring at normal temperature, adding polycarboxylic acid dispersing agent, heating to 50-55 ℃, continuously stirring, filtering the solution to obtain precipitate, washing the precipitate with deionized water, vacuum drying the washed precipitate, grinding and sieving to obtain modified silica fume; s313, mixing the modified slag micropowder with the modified silica fume, adding deionized water, stirring to form a suspension, standing, adding a modified silane coupling agent, stirring, drying, grinding and sieving to obtain the modified mineral admixture.
  3. 3. The method for preparing the composite solid waste-based cementing material according to claim 2, wherein the modified silane coupling agent in the step S313 is prepared by the following steps: Adding gamma-aminopropyl triethoxysilane into deionized water, stirring, adding epichlorohydrin, adding triethylamine catalyst, heating to 50-60 ℃, stirring for 40-50min, adding hydroxyl silicone oil, stirring for 30-40min, and vacuum drying to obtain the modified silane coupling agent.
  4. 4. The preparation method of the composite solid waste-based cementing material according to claim 1, wherein in the step S31, the mass part ratio of the alkaline activator to the sulfate activator is 100 (40-60), the mass part ratio of the basic synergistic activator to the modified mineral admixture is 100 (112-160), the mass part ratio of the basic synergistic activator to the deionized water is (42-80): 100, and the mass part ratio of the modified mineral admixture to the deionized water is (40-60): 100.
  5. 5. The preparation method of the composite solid waste-based cementing material according to claim 1, wherein the mass ratio of the exciting agent slurry to the dispersing agent in the step S32 is 100 (0.5-2).
  6. 6. The preparation method of the composite solid waste-based cementing material according to claim 2, wherein the mass ratio of the slag micro powder, the sodium sulfate and the deionized water in the step S311 is 100 (5-10) (60-80).
  7. 7. The preparation method of the composite solid waste-based cementing material according to claim 2, wherein in the step S312, the mass ratio of silica fume to hydrogen peroxide solution to nitric acid to polycarboxylic acid dispersant is 100 (200-300) (5-10) (0.74-3.6).
  8. 8. The preparation method of the composite solid waste-based cementing material according to claim 2, wherein the mass portion ratio of the modified slag micro powder to the modified silica fume, the deionized water and the modified silane coupling agent in the step S313 is 100 (150-200) (3-8), and the mass portion ratio of the modified slag micro powder to the modified silica fume is 100 (40-60).
  9. 9. The preparation method of the composite solid waste-based cementing material according to claim 3, wherein the mass ratio of gamma-aminopropyl triethoxysilane, deionized water, epichlorohydrin, triethylamine catalyst and hydroxyl silicone oil in the preparation process of the modified silane coupling agent is 100 (50-80): 80-100): 1-3): 20-40.
  10. 10. Use of the composite solid waste-based cementitious material prepared by the preparation method according to any one of claims 1 to 9 in concrete preparation.

Description

Preparation method and application of composite solid waste-based cementing material Technical Field The invention relates to the technical field of mixed gel, in particular to a preparation method and application of a composite solid waste-based cementing material. Background Portland cement is the most widely used cementing material worldwide, but the production process has obvious short plates, and each time 1 ton of cement clinker is produced, about 1 ton of CO 2 is discharged due to limestone decomposition and fossil fuel combustion, the continuous 35-year cement yield in China is the first world, the annual energy exceeds 22 hundred million tons, and the Portland cement is a core source of carbon emission in the building material industry, and meanwhile, the cement production consumes a large amount of non-renewable mineral products such as limestone, clay and the like, has high resource dependence and forms outstanding contradiction with a double-carbon target and ecological civilization construction. In the prior art, single physical grinding or simple alkali excitation mode is adopted to improve solid waste activity, cooperative regulation and control on multiple components are lacking, silicon-aluminum oxygen bonds of low-activity solid waste (such as iron tailings and fly ash) cannot be activated from a chemical level only through grinding and refining particles, while single alkali excitation can dissociate slag activity, but the excitation effect on steel slag and fly ash is limited, slurry alkalinity is easy to be too high, later volume expansion is caused, in addition, the hydration rate difference of different solid waste is large, the existing scheme cannot realize hydration process synchronization, the early strength of a material is low, the later strength is slowly increased, and the requirement of modern engineering on quick hardening and early strength is difficult to meet. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a preparation method and application of a composite solid waste-based cementing material, so as to solve the problems in the background art. In order to achieve the above purpose, the present invention provides the following technical solutions: the preparation method of the composite solid waste-based cementing material comprises the following steps: S1, drying 40-50 parts of granulated blast furnace slag, 10-15 parts of steel slag, 10-15 parts of fly ash and 8-12 parts of iron tailings, adding 6-10 parts of phosphogypsum into lime, uniformly stirring, neutralizing to pH6-8, standing and drying; S2, grinding the dried granulated blast furnace slag, steel slag, fly ash, iron tailings, phosphogypsum and 10-15 parts of Portland cement to a specific surface area of 300-500m 2/kg, and mixing to obtain a pretreated powder raw material; S3, adding 5-10 parts of modified activator into the pretreated powder raw material, and stirring to obtain a composite solid waste-based cementing material; wherein, the modification exciting agent in the step S3 is prepared by the following steps: S31, adding an alkaline excitant and a sulfate excitant into deionized water to prepare a basic synergistic excitant, adding a modified mineral admixture into the deionized water, uniformly stirring, and standing at a constant temperature to perform pre-activation treatment; S32, adding the pre-activated modified mineral admixture into a basic synergistic excitant, stirring, cooling to room temperature to obtain excitant slurry, adding a dispersing agent, stirring and adjusting the viscosity to 500-800 mPa.s, and curing at 20-25 ℃ to obtain a curing excitant; S33, vacuum drying the curing activator, and grinding to obtain modified activator powder. Further, the modified mineral admixture in step S31 is prepared by the steps of: s311, uniformly mixing slag micropowder with sodium sulfate, adding a proper amount of deionized water, stirring to form paste, standing at normal temperature, calcining the paste slag micropowder at constant temperature, cooling to room temperature, grinding and sieving to obtain modified slag micropowder; S312, adding silica fume into hydrogen peroxide solution, adding nitric acid, stirring at normal temperature, adding polycarboxylic acid dispersing agent, heating to 50-55 ℃, continuously stirring, filtering the solution to obtain precipitate, washing the precipitate with deionized water, vacuum drying the washed precipitate, grinding and sieving to obtain modified silica fume; s313, mixing the modified slag micropowder with the modified silica fume, adding deionized water, stirring to form a suspension, standing, adding a modified silane coupling agent, stirring, drying, grinding and sieving to obtain the modified mineral admixture. Further, the modified silane coupling agent in the step S313 is prepared by the following steps: Adding gamma-aminopropyl triethoxysilane into deionized water, stirring, adding epichlorohydrin, a