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Micron-sized mineral admixture for concrete

A mineral admixture, micron-scale technology, applied in the field of concrete admixtures, can solve the problems of construction difficulties, excessive ammonium ion content, loading and unloading difficulties, etc. The effect of shipping costs

Inactive Publication Date: 2021-01-05
YUNNAN CONSTR INVESTMENT HLDG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research and development of concrete composite admixtures are actively carried out at home and abroad, but there are still the following technical difficulties: 1. The high water demand makes construction difficult and cannot guarantee the strength requirements after construction; 2. It is impossible to obtain high Early strength and ensure that the later strength continues to increase, and even the phenomenon of late strength shrinkage occurs; 3. The content of chloride ions exceeds the standard, the content of ammonium ions exceeds the standard; the loss on ignition exceeds the standard; 4. The density is too small, resulting in difficult loading and unloading and one-time transportation volume decrease very much

Method used

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  • Micron-sized mineral admixture for concrete
  • Micron-sized mineral admixture for concrete
  • Micron-sized mineral admixture for concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 350kg of fly ash, 100kg of silica fume, 400kg of granulated blast furnace slag powder, 130kg of limestone powder, 5kg of hydroxypropyl methylcellulose, 5kg of MgO expansion agent, 8kg of polycarboxylate water reducer, 0.2kg of citric acid, boric acid 0.2kg, Sodium Gluconate 0.2kg, Sodium Lithium Ammonium Persulfate 0.2kg, Sodium Tartrate 0.2kg, Nano Calcium Dioxycarbonate 0.2kg, Nano Silicon Dioxide 0.2kg, Calcium Formate 0.2kg, Calcium Acetate 0.2kg, Cellulose Ether 0.2kg. Then all the weighed materials are mechanically mixed and ground by a ball mill to prepare micron-scale mineral admixtures for concrete.

Embodiment 2

[0034] Weigh 340kg of fly ash, 110kg of silica fume, 390kg of granulated blast furnace slag powder, 140kg of limestone powder, 6kg of hydroxypropyl methylcellulose, 4kg of MgO expansion agent, 7kg of polycarboxylate superplasticizer, 0.3kg of citric acid, boric acid 0.1kg, Sodium Gluconate 0.1kg, Sodium Lithium Ammonium Persulfate 0.3kg, Sodium Tartrate 0.1kg, Nano Calcium Dioxycarbonate 0.3kg, Nano Silicon Dioxide 0.1kg, Calcium Formate 0.1kg, Calcium Acetate 0.3kg, Cellulose Ether 0.3kg. Then all the weighed materials are mechanically mixed and ground by a ball mill to prepare micron-scale mineral admixtures for concrete.

Embodiment 3

[0036] Weigh 360kg of fly ash, 90kg of silica fume, 410kg of granulated blast furnace slag powder, 120kg of limestone powder, 4kg of hydroxypropyl methylcellulose, 6kg of MgO expansion agent, 9kg of polycarboxylate water reducer, 0.1kg of citric acid, boric acid 0.3kg, Sodium Gluconate 0.3kg, Sodium Lithium Ammonium Persulfate 0.1kg, Sodium Tartrate 0.3kg, Nano Calcium Dioxycarbonate 0.1kg, Nano Silicon Dioxide 0.3kg, Calcium Formate 0.3kg, Calcium Acetate 0.1kg, Cellulose Ether 0.1kg. Then all the weighed materials are mechanically mixed and ground by a ball mill to prepare micron-scale mineral admixtures for concrete.

[0037] The fly ash described in the above embodiments 1, 2, and 3 is a secondary fly ash, and the density of the fly ash is more than or equal to 2.5g / m 3 , 28d compressive strength ratio ≥ 70%. The silicon dioxide content in the silica fume is ≥ 90%wt, the water content is less than 1%wt, the loss on ignition is less than 6%, the 28d activity index is > 11...

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Abstract

The invention discloses a micron-sized mineral admixture for concrete. The concrete admixture is prepared from fly ash, silica fume, granulated blast furnace slag powder, limestone powder, hydroxypropyl methyl cellulose, MgO expanding agent, polycarboxylate superplasticizer, citric acid, boric acid, sodium gluconate, lithium sodium persulfate, sodium tartrate, nano calcium carbonate dioxide, nanosilicon dioxide, calcium formate, calcium acetate and cellulose ether. The concrete strength can be improved, and the concrete workability is improved; meanwhile, the use amount of cement in per cubicmeter of concrete can be reduced, and hydration heat in the concrete is reduced; the use amount of free water in the concrete is reduced, the risks of shrinkage and cracking of the concrete are reduced, the compactness of the concrete is improved, and the durability of the concrete is improved.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a composite mineral admixture for concrete. Background technique [0002] Concrete composite admixtures can significantly improve the defects in the composition and microstructure of Portland cement itself, including degraded interface regions, poor durability crystal phase structures, microcracks caused by high heat of hydration, etc., giving The excellent durability and workability of concrete have surpassed the traditional significance of cost reduction and environmental protection, and have become an indispensable component of concrete materials. Some people call it the sixth component of concrete. Concrete composite admixtures can be widely used in various concrete components, grouting materials, repair materials and other fields based on ordinary Portland cement. At present, the research and development of concrete composite admixtures are actively carried out ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38
CPCC04B40/0039C04B18/08C04B18/146C04B18/141C04B14/28C04B22/066C04B14/062C04B24/06C04B24/04C04B24/383C04B22/0013C04B22/14
Inventor 叶鸿宏杨勇马正林白晓波王伟樊兴波魏家旭刘昆珏李官勇李白雨胡俊马兴伟刘睿迪侯翠琼
Owner YUNNAN CONSTR INVESTMENT HLDG GRP CO LTD
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