Fly ash-desulfuration gypsum- concrete self-expandable anti-crack dry powder mortar and method of preparing the same

A technology for desulfurized gypsum and dry powder mortar, applied in the field of building materials, can solve problems such as application limitation, limited strength, and no disclosure, and achieve the effects of improving workability of mortar, reducing dry shrinkage rate, and reducing shrinkage rate.

Inactive Publication Date: 2009-10-07
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of desulfurized gypsum-fly ash cement is limited after all, and its application is greatly restricted; and for the development of mortar materials, the micro-expansion characteristics of desulfurized gypsum hydration and the activity between fly ash and desulfurized gypsum are fully utilized. Exciting effect, under the modification of anti-cracking components, fly ash-desulfurized gypsum-cement self-ex...

Method used

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  • Fly ash-desulfuration gypsum- concrete self-expandable anti-crack dry powder mortar and method of preparing the same
  • Fly ash-desulfuration gypsum- concrete self-expandable anti-crack dry powder mortar and method of preparing the same
  • Fly ash-desulfuration gypsum- concrete self-expandable anti-crack dry powder mortar and method of preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Fly ash-desulfurized gypsum-cement self-expanding anti-cracking dry powder mortar I, select materials according to the following mass ratios:

[0029] Cementitious material:

[0030] ① Power plant desulfurization gypsum: 25%;

[0031] ② Power plant dry discharge class I fly ash: 60%, Blaine specific surface area 420m 2 / kg;

[0032] ③ 42.5 Ordinary Portland cement: 15%.

[0033] Modified Enhanced Components:

[0034] ①Water-reducing agent: naphthalene-based high-efficiency water-reducing agent, mixed at 1.0% of the mass of the gelling material;

[0035] ②Methyl cellulose ether: mixed at 0.1% of the mass of the gelling material;

[0036] ③ Polypropylene mixed fiber: mixed at 0.4% of the mass of the cementitious material;

[0037] ④ Anhydrous sodium sulfate: mixed at 1.0% of the mass of the gelling material.

[0038] Skeleton fine particle material: fine quartz sand particles, mixed with 3 times the mass of cementitious material (1:3 mortar).

[0039] Preparation of...

Embodiment 2

[0050] Fly ash-desulfurized gypsum-cement self-expanding anti-cracking dry powder mortar II, select materials according to the following mass ratio:

[0051] Cementitious material:

[0052] ① Power plant desulfurization gypsum: 20%;

[0053] ②Power plant dry discharge class II fly ash: 60%, Blaine specific surface area 300m 2 / kg;

[0054] ③42.5 Ordinary Portland cement: 20%.

[0055] Modified Enhanced Components:

[0056] ①Water-reducer: naphthalene-based high-efficiency water-reducer, mixed in at 1.5% of the mass of the gelling material;

[0057] ②Methyl cellulose ether: mixed at 0.1% of the mass of the gelling material;

[0058] ③ Polypropylene mixed fiber: mixed at 0.5% of the mass of the cementitious material;

[0059] ④ Anhydrous sodium sulfate: mixed at 1.5% of the mass of the gelling material.

[0060] Skeleton fine particle material: fine quartz sand particles, mixed with 3 times the mass of cementitious material (1:3 mortar).

[0061] Preparation of fly ash-d...

Embodiment 3

[0071] Fly ash-desulfurized gypsum-cement self-expanding anti-cracking dry powder mortar III, select materials according to the following mass ratio:

[0072] Cementitious material:

[0073] ① Power plant desulfurization gypsum: 30%;

[0074] ②Plant dry discharge class I fly ash: 55%, Blaine specific surface area 420m 2 / kg;

[0075] ③ 42.5 Ordinary Portland cement: 15%.

[0076] Modified Enhanced Components:

[0077] ①Water-reducing agent: naphthalene-based high-efficiency water-reducing agent, mixed at 1.0% of the mass of the gelling material;

[0078] ②Methyl cellulose ether: mixed at 0.1% of the mass of the gelling material;

[0079] ③ Polypropylene mixed fiber: mixed at 0.4% of the mass of the cementitious material;

[0080] ④ Anhydrous sodium sulfate: mixed at 1.0% of the mass of the gelling material.

[0081] Skeleton fine particle material: fine quartz sand particles, mixed in at 2.5 times the mass of the cementitious material (1:2.5 mortar).

[0082] Preparati...

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Abstract

The present invention relate to a fly ash- desulfuration gypsum- concrete self-expandable anti-crack dry powder mortar and method of preparing the same. The dry powder mortar is mixed stirring by gelled materials, modified enhancement component and skeleton fine-grained materials. Each ingredient of the gelled materials is in mass ratio of: fly ash 10-60%, desulfuration gypsum 20-70%, concrete 10-20%. Each ingredient of the modified enhancement compoents in the gelled materials is in mass ratio of: methyl cellulose aether 0.1-0.3%, polypropylene farrago fibre 0.2-0.3%, anhydrous sodium sulfate 0-2%, water reducing agent 0.5-2.5%. The admixing amount of the fine-grained materials is 1.5-3 time the mass of the gelled materials. The present invention is provided with better early and later stage mechanics capability, excellent anti-crack decrement capability, specially suitable for surface rendering and masonry of buildings, simultaneity utilizing a good deal of industry scrap fly ash and desulfuration gypsum of coal-fired power plant, possess prominent energy-saving and environment friendly capability.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a fly ash-desulfurized gypsum-cement self-expanding anti-cracking dry powder mortar and a preparation method thereof. Background technique [0002] Dry powder mortar, also known as dry mix mortar or dry mix mortar, refers to a dry powder material made by mixing cementitious materials, fine aggregates, admixtures and fillers in a certain proportion in a specialized manufacturer. The prepared dry mortar is usually transported to the construction site in bags or in bulk, and then it can be used directly after adding water in a certain proportion. Compared with the mortar mixed on site, dry powder mortar has the characteristics of good quality, high production efficiency, rich variety and environmental friendliness. In some developed countries in Europe and the United States, dry powder mortar has been widely used and has basically replaced traditional mortar. In our count...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B18/08C04B14/06C04B14/38
CPCC04B28/144C04B40/0039Y02W30/91C04B14/06C04B14/38C04B16/0633C04B18/08C04B22/147C04B24/383C04B2103/302
Inventor 高英力陈瑜
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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