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A kind of cementitious material using fly ash as raw material and preparation method thereof

A technology of cementitious materials and fly ash, which is applied in the field of building materials, can solve the problems of poor product performance, less fly ash consumption, and high fly ash quality requirements, and achieve low equipment requirements, low emissions, and improved production Effectiveness and efficiency of equipment usage

Active Publication Date: 2016-08-24
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing technology of using fly ash to prepare cementitious materials has the problems of small amount of fly ash, high quality requirements for fly ash and poor product performance.

Method used

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  • A kind of cementitious material using fly ash as raw material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A cementitious material using fly ash as a raw material, wherein the batch material contains the following components in parts by mass:

[0031] 78 parts of fly ash

[0032] Lime 22 parts

[0033] Sodium hydroxide 0.5 parts

[0034] Weigh fly ash, lime, and sodium hydroxide according to the above mass ratio, and grind them together until the fineness is 80 μm and the sieve residue is 4.3%. Pour the batch into a mixer, add 150 parts of water and stir for 3 minutes to obtain raw Slurry: hydrothermally treat the raw slurry at 90°C for 14 h in a hydrothermal reaction tank to obtain a hydrothermally synthesized slurry, filter and dehydrate the hydrothermally synthesized slurry to obtain a hydrothermally synthesized block, and calcinate the block at 750°C for 120min Then blow air to cool to obtain clinker; take 92 parts of clinker, 8 parts of dihydrate gypsum, and 0.2 part of sodium gluconate to grind together to 3.4% of the 80 μm sieve to obtain a gelled material. The wat...

Embodiment 2

[0036] A cementitious material using fly ash as a raw material, wherein the batch material contains the following components in parts by mass:

[0037] 62 parts of fly ash

[0038] Lime 38 parts

[0039] Sodium carbonate 2.0 parts

[0040] Weigh fly ash, lime, and sodium carbonate according to the above mass ratio, and grind them together until the fineness is 80 μm, and the sieve residue is 2.8%. Pour the batch into a mixer, add 250 parts of water, and stir for 3 minutes to obtain a raw meal Slurry: hydrothermally treat the raw slurry in a hydrothermal reaction tank at 98°C for 16 h to obtain a hydrothermally synthesized slurry, press filter and dehydrate the hydrothermally synthesized slurry to obtain a hydrothermally synthesized block, and calcinate the block at 950°C for 30 min Then blow air to cool to obtain clinker; take 95 parts of clinker, 5 parts of anhydrous gypsum, and 1.5 parts of sodium phosphate to grind together to 2.9% of the 80 μm sieve to obtain a gelled ma...

Embodiment 3

[0042] A cementitious material using fly ash as a raw material, wherein the batch material contains the following components in parts by mass:

[0043] 70 parts of fly ash

[0044] Lime 30 parts

[0045] Sodium hydroxide 1.0 parts

[0046] Weigh fly ash, lime, and sodium hydroxide according to the above mass ratio, and grind them together until the fineness is 80 μm, and the sieve residue is 3.6%. Pour the batch into a mixer, add 200 parts of water and stir for 3 minutes to obtain raw Slurry: The raw slurry was hydrothermally treated at 95°C for 12 h in a hydrothermal reaction tank to obtain a hydrothermally synthesized slurry, and the hydrothermally synthesized slurry was press-filtered and dehydrated to obtain a hydrothermally synthesized block, which was calcined at 850°C for 60 After 1 min, blow air to cool to obtain clinker; take 94 parts of clinker, 6 parts of anhydrous gypsum, and 1.2 parts of sodium pyrophosphate to grind together to 3.5% of the 80 μm sieve to obtain...

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Abstract

The invention discloses a cementing material prepared from fly ash and a preparation method thereof. The preparation method of the cementing material comprises the following steps: milling 62-78 parts by mass of fly ash, 22-38 parts by mass of lime and 0.5-2 parts by mass of excitant to obtain an admixture of which the 80 mu m screen residue is less than 5%, adding 150-250 parts by mass of water, stirring to obtain a uniform raw slurry, carrying out hydrothermal treatment on the raw slurry at 90-98 DEG C for 8-16 hours, dewatering in a filter press to obtain a hydrothermal synthesis block, calcining at 750-950 DEG C for 30-120 minutes, and cooling with air to obtain clinker; and milling 92-95 parts by mass of clinker, 5-8 parts by mass of gypsum and 0.2-1.5 parts by mass of retarder until the 80 mu m screen residue is less than 4%. The cementing material can utilize low-grade fly ash, and has the advantages of high utilization ratio of fly ash, low calcination temperature and low heat loss. The product has the characteristics of quick setting and hardening, high long-term strength and high sulfate attack resistance. The cementing material is especially suitable for tunnel, underwater, alkaline land and coastal area engineering.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a cementitious material using fly ash as a raw material and a preparation method thereof. Background technique [0002] Construction projects require a large amount of cementitious materials, of which the largest amount is various types of cement. The production of cement consumes a lot of energy and non-renewable resources such as limestone and clay, and emits a lot of greenhouse gases to pollute the environment. Using industrial waste as the main raw material to develop cementitious materials that consume less energy and non-renewable resources, have little impact on the environment, and can replace or partially replace cement has important economic, resource and environmental protection values. Fly ash is a solid waste mainly discharged from thermal power plants. In recent years, a large part of fly ash discharged from power plants by dry method has bee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/26C04B7/36
CPCY02P40/10Y02P40/121
Inventor 方永浩龚泳帆游多朱晨辉顾亚敏韦华王亚楠缪新河顾冲时苏怀智
Owner HOHAI UNIV
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