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Sulfur-fixing ash cement-based material and expansibility control method thereof

A technology for cement-based materials and sulfur-fixing ash, which is applied in the field of building materials, can solve problems such as needs and limited application scope, and achieve the effects of reducing pollution, reducing apparent density and improving strength.

Inactive Publication Date: 2014-08-13
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires autoclave curing and autoclave equipment, and its scope of application is limited.

Method used

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  • Sulfur-fixing ash cement-based material and expansibility control method thereof

Examples

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Effect test

Embodiment 1

[0039] A method for controlling the expansibility of a sulfur-fixed ash cement-based material, specifically comprising the following steps:

[0040] 1) Weigh 45 parts of 42.5R ordinary Portland cement, 55 parts of sulfur-fixing ash, 75 parts of water and 0.28 parts of hydroxypropyl methylcellulose ether; the sulfur-fixing ash is a circulating fluidized bed The specific surface area of ​​the discharged sulfur-fixed ash is 287m 2 / kg, the viscosity of hydroxypropyl methylcellulose ether is 200000MPa.s;

[0041] 2) Mix the cement, sulfur-fixed ash and hydroxypropyl methylcellulose ether weighed in step 1) evenly by dry mixing;

[0042] 3) Add the water weighed in step 1) to the mixture obtained in step 2), slowly add water while stirring, and stir for 5 minutes to obtain a slurry;

[0043] 4) Pour the slurry obtained in step 3) into the mold, and after curing for 24 hours at normal temperature and pressure, remove the film; then cure it in the air to the desired age, and then o...

Embodiment 2

[0045] A method for controlling the expansibility of a sulfur-fixed ash cement-based material, specifically comprising the following steps:

[0046] 1) Weigh 45 parts of 42.5R ordinary Portland cement, 55 parts of sulfur-fixing ash, 90 parts of water and 0.45 parts of hydroxypropyl methylcellulose ether; the sulfur-fixing ash is the sulfur-fixing ash discharged from the circulating fluidized bed Ash raw ash with a specific surface area of ​​350m 2 / kg, the viscosity of hydroxypropyl methylcellulose ether is 150000MPa.s;

[0047] 2) Mix the cement, sulfur-fixed ash and hydroxypropyl methylcellulose ether weighed in step 1) evenly by dry mixing;

[0048] 3) Add the water weighed in step 1) to the mixture obtained in step 2), slowly add water while stirring, and stir for 8 minutes to obtain a slurry;

[0049] 4) Pour the slurry obtained in step 3) into the mold, and after curing for 24 hours at normal temperature and pressure, remove the film; then cure it in the air to the des...

Embodiment 3

[0051] A method for controlling the expansibility of a sulfur-fixed ash cement-based material, specifically comprising the following steps:

[0052] 1) Weigh 40 parts of 42.5R ordinary Portland cement, 60 parts of sulfur-fixing ash, 75 parts of water and 0.28 parts of hydroxypropyl methylcellulose ether; the sulfur-fixing ash is the sulfur-fixing ash discharged from the circulating fluidized bed Ash raw ash, its specific surface area is 287m 2 / kg, the viscosity of hydroxypropyl methylcellulose ether is 200000MPa.s;

[0053] 2) Mix the cement, sulfur-fixed ash and hydroxypropyl methylcellulose ether weighed in step 1) evenly by dry mixing;

[0054] 3) Add the water weighed in step 1) to the mixture obtained in step 2), slowly add water while stirring, and stir for 5 minutes to obtain a slurry;

[0055] 4) Pour the slurry obtained in step 3) into the mold, and after curing for 24 hours at normal temperature and pressure, remove the film; then cure it in the air to the desired...

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Abstract

The invention discloses a sulfur-fixing ash cement-based material. The sulfur-fixing ash cement-based material comprises 30-50 parts of cement, 50-70 parts of sulfur-fixing ash, 0.18-0.84 part of hydroxypropyl methyl cellulose ether and 60-120 parts of water. The final product has good volume stability, low performance density and good heat insulation performance. The invention also discloses an expansibility control method for the sulfur-fixing ash cement-based material. The method comprises the following specific steps: (1) weighing all the raw materials according to the sulfur-fixing ash cement-based material; (2) uniformly mixing the cement, sulfur-fixing ash and hydroxypropyl methyl cellulose ether; (3) slowly adding water and stirring for at least 5 minutes; (4) curing for 24 hours at normal pressure and temperature, then demoulding to obtain the sulfur-fixing ash cement-based material. The steps can be carried out at normal pressure and temperature and have strong operability; the prepared sulfur-fixing ash cement-based material can be used in the building energy conservation field, and takes the sulfur-fixing ash as the raw material, so that the pollution of the sulfur-fixing ash to the environment is reduced, and recycling of the sulfur-fixing ash is realized.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a sulfur-fixed ash cement-based material and a method for controlling its expansibility. Background technique [0002] With the strengthening of national environmental protection, clean coal-fired technology is an inevitable trend of social development. Circulating fluidized bed coal-fired sulfur fixation technology has been popularized and applied in a large area due to its advantages of small investment, convenient transformation, high desulfurization rate, and combustible low-quality coal; but it will produce a large number of by-products, namely sulfur At present, there is no suitable resource utilization method for sulfur-fixed ash and sulfur-fixed slag, and a large amount of sulfur-fixed ash and ash is piled up. Therefore, the resource utilization of sulfur-fixed ash is becoming more and more urgent. [0003] At present, there have been studies on the performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/04C04B24/38
CPCY02W30/91
Inventor 钱觉时谢小莉王智叶子琪黄煜镔
Owner CHONGQING UNIV
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