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Ceramic fiber reinforced cement-base composite material

A technology of ceramic fibers and composite materials, applied in the direction of inorganic raw materials such as rayon, can solve the problems of easy agglomeration of steel fibers, constraints of large-scale industrial application, and high prices of carbon fibers and aramid fibers.

Inactive Publication Date: 2004-09-08
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited resources of silica fume, its large-scale industrial application is also subject to great constraints.
In addition, in view of the fact that asbestos fibers are considered to be carcinogenic, steel fibers are easy to agglomerate, carbon fibers and aramid fibers are expensive, etc., it is necessary to find a new type of cement that can exist stably in ordinary Portland cement, is convenient for construction, and is economically feasible. high elastic modulus fiber reinforced material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Adopt ceramic fibers with alumina content of 45%, fiber diameter of 8 μm, and fiber length of 5 mm, according to the following ratio (mass ratio): 32.5 ordinary Portland cement: water: SN-II: ceramic fiber=1: 0.30: 0.005: 0.02 molding cement The clean slurry specimens were cured for 28 days under standard curing conditions. The bending strength and impact strength of the ceramic fiber were measured to be 30%, and the impact strength was 150%, and the above-mentioned strength could be completely maintained for at least one year under 70°C humid heat conditions. Enhancement.

Embodiment 2

[0035] Adopt ceramic fiber with alumina content of 80%, fiber diameter of 10 μm, and fiber length of 10 mm, according to the following ratio (mass ratio) 32.5 ordinary Portland cement: medium sand: water: SN-II: ceramic fiber=1: 2.82: 0.42: 0.005∶0.05 molded cement mortar specimens were cured for 28 days under standard curing conditions. The measured flexural strengthening effect of ceramic fibers was 50%, and the impact strengthening effect was 200%. The enhancement effect described above can be fully maintained. The impermeability, frost resistance and wear resistance of ceramic fiber reinforced cement-based composite materials can be increased by 50%, 150% and 30% respectively compared with those without mixing. The total weight of plastic shrinkage cracking (tested by flat plate method) can be reduced by about 30% compared with that without mixing, and the drying shrinkage in the early stage of hardening is about 10% lower than that without mixing.

Embodiment 3

[0037]Adopt the ceramic fiber of aluminum oxide content 60%, fiber diameter 5 μm, fiber length 15mm, by following ratio (mass ratio) 42.5 ordinary Portland cement: medium sand: 5-25 gravel: water: SN-II: ceramic fiber= 1∶1.76∶2.65∶0.44∶0.008∶0.08 shaped concrete specimens were cured for 28 days under standard curing conditions, and the flexural strengthening effect of the ceramic fiber was measured to be 40%, the impact resistance strengthening effect was 150%, and at 70 ℃ humid heat conditions, at least one year can fully maintain the above-mentioned enhancement effect. The impermeability, frost resistance and wear resistance of ceramic fiber reinforced cement-based composites can be increased by 30%, 180% and 40% respectively compared with those without mixing. The total weight of plastic shrinkage cracking (tested by flat plate method) can be reduced by about 50% compared with that without mixing, and the drying shrinkage in the early stage of hardening is about 30% lower t...

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Abstract

The present invention is one kind of ceramic fiber reinforced Portland cement-base composite material. Ceramic fiber is mixed into cement-base material, such as cement slurry, mortar and concrete, to serve for reinforcement and toughening and raise bending strength by 30-100 % and impact strength 150-500 %. The ceramic fiber has excellent stability in the high alkali environment of Portland cement, and is one kind of ideal cement reinforcing material. The ceramic fiber reinforced Portland cement-base composite material may be used widely in cement-base material engineering, such as cement concrete structure engineering, road, bridge, terrace, revetment, dam and other engineering.

Description

technical field [0001] The invention belongs to the technical field of material science and construction engineering, and in particular relates to a reinforced cement-based composite material mixed with inorganic fibers. technical background [0002] Concrete is one of the largest and most widely used building materials in the world. At present, my country's annual concrete consumption has reached about 1 billion cubic meters. By 2010, my country's cement output will increase to 800-850 million tons, almost double the 490 million tons in 1996, and correspondingly, the amount of concrete will also increase significantly. Therefore, it is certain that concrete will remain the main building material for modern engineering construction in my country for a long period of time in the future. Moreover, because it has the advantages of wide application range, cheap price, easy casting, relatively durable, and can effectively use some industrial solid waste to make energy-saving an...

Claims

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Application Information

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IPC IPC(8): C04B14/04C04B14/38C04B28/02C04B35/10D01F9/08
CPCC04B2201/50C04B28/02
Inventor 马一平
Owner TONGJI UNIV
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