Sulfur-fixing ash dry-mixed mortar and preparation method thereof

A technology of dry-mixed mortar and sulfur-fixed ash, which is applied in the field of dry-mixed mortar, which can solve the problems of low mortar strength and low activity of fly ash, and achieve the effects of reducing pore content, promoting early strength, and improving particle gradation of raw materials

Inactive Publication Date: 2018-09-28
山西平朔煤矸石发电有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fly ash has low activity and requires an alkaline environment to stimulate. After replacing cement, it will delay the hydration process of cement, resulting in low early strength of mortar.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of sulfur-fixed ash dry-mixed mortar described in this embodiment includes the following components in mass percentage: 8% sulfur-fixed ash, 2% desulfurized gypsum, 15% Portland cement clinker, 75% river sand, polycarboxylate Acid superplasticizer 0.08%.

[0017] SiO in the sulfur-fixing ash 2 Content is 40%, Al 2 o 3 The content is 45%.

[0018] The specific preparation method of sulfur-fixed ash dry-mixed mortar comprises the following steps:

[0019] In the first step, the above-mentioned sulfur-fixed ash is pulverized into superfine sulfur-fixed ash with a specific surface area of ​​600m2 / kg under the condition of a pressure of 0.5MPa and a temperature of 280°C through a steam kinetic energy mill;

[0020] The second step is to dry the above-mentioned desulfurized gypsum at a temperature of 45°C until the moisture content is 0.5%, and then use a cement ball mill to grind the dried desulfurized gypsum so that the fineness of the desulfurized gypsum after g...

Embodiment 2

[0024] A kind of sulfur-fixed ash dry-mixed mortar described in this embodiment includes the following components in mass percentage: 26% of sulfur-fixed ash, 1% of desulfurized gypsum, 3% of Portland cement clinker, 70% of river sand, polycarboxylate Acid superplasticizer 0.12%.

[0025] SiO in the sulfur-fixing ash 2 Content is 40%, Al 2 o 3 The content is 45%.

[0026] The specific preparation method of sulfur-fixed ash dry-mixed mortar comprises the following steps:

[0027] In the first step, the above-mentioned sulfur-fixed ash is pulverized into superfine sulfur-fixed ash with a specific surface area of ​​1200m2 / kg under the condition of a pressure of 0.7MPa and a temperature of 300°C through a steam kinetic energy mill;

[0028] The second step is to dry the above-mentioned desulfurized gypsum at a temperature of 45°C until the moisture content is 0.5%, and then use a cement ball mill to grind the dried desulfurized gypsum so that the fineness of the desulfurized g...

Embodiment 3

[0032] A kind of sulfur-fixed ash dry-mixed mortar described in this embodiment includes the following components in mass percentage: 26% of sulfur-fixed ash, 4% of desulfurized gypsum, 10% of Portland cement clinker, 60% of river sand, polycarboxylate Acid superplasticizer 0.12%.

[0033] SiO in the sulfur-fixing ash 2 Content is 50%, Al 2 o 3 The content is 30%.

[0034] The specific preparation method of sulfur-fixed ash dry-mixed mortar comprises the following steps:

[0035] In the first step, the above-mentioned sulfur-fixed ash is pulverized into ultra-fine sulfur-fixed ash with a specific surface area of ​​1000m2 / kg under the condition of a pressure of 0.7MPa and a temperature of 280°C through a steam kinetic energy mill;

[0036] The second step is to dry the above-mentioned desulfurized gypsum at a temperature of 50°C until the moisture content is 0%, and then use a cement ball mill to grind the dried desulfurized gypsum so that the fineness of the ground desulfu...

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Abstract

The invention belongs to the technical field of dry-mixed mortar, and particularly relates to sulfur-fixing ash dry-mixed mortar and a preparation method thereof. The preparation method comprises thefollowing steps: taking sulfur-fixing ash, desulfurized gypsum, Portland cement clinker, river sand and a polycarboxylate superplasticizer as raw materials; and putting the treated sulfur-fixing ash,desulfurized gypsum, Portland cement clinker, river sand and polycarboxylate superplasticizer into a mixer for stirring to obtain the sulfur-fixing ash dry-mixed mortar. According to the preparation method disclosed by the invention, the cement is replaced with the sulfur-fixing ash, the desulfurized gypsum and the Portland cement clinker; the Portland cement clinker and the desulfurized gypsum which are subjected to grinding treatment have suitable fineness, so that heterogeneous nucleation in the hydration process is enhanced and further the early strength of the mortar is promoted; and meanwhile, after the sulfur-fixing ash is doped and then is subjected to ultrafine grinding, the grain composition of the raw materials can be effectively improved and is enabled to be closer to an optimal particle packing state, the void content of a mortar system is reduced, and eventually sulfate corrosion resistance and frost resistance of the sulfur-fixing ash dry-mixed mortar can be improved.

Description

technical field [0001] The invention belongs to the technical field of dry-mixed mortar, and in particular relates to a sulfur-fixed ash dry-mixed mortar and a preparation method thereof. Background technique [0002] With the development of my country's electric power industry, the utilization rate of low calorific value coal is gradually increasing, and the output of its industrial by-products is also increasing. In particular, the development of circulating fluidized bed boiler technology has greatly absorbed solid waste such as coal gangue, but at the same time produced a large amount of sulfur-fixed ash. The use of sulfur-fixed ash as dry-mixed mortar can not only greatly consume solid waste, reduce environmental pollution, but also reduce the amount of cement used, which is environmentally friendly and economical. At present, fly ash has become a commonly used mineral admixture in the field of building materials in my country. [0003] Studies have shown that adding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/20C04B2111/2015C04B2201/50C04B18/062C04B18/064C04B14/06C04B2103/302
Inventor 武建芳乔岗杰赵耀芳任继德赵云凯李鹏司永强
Owner 山西平朔煤矸石发电有限责任公司
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