JPS598654A - Manufacture of fiber reinforced cement hardened body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Purpose] When manufacturing a fiber-reinforced hardened cement body using carbon fibers as reinforcing fibers, when cement, water, carbon fibers, etc. are mixed, the carbon fibers become entangled with each other, The purpose of the present invention is to produce a hardened fiber-reinforced cement body that prevents ball-like formation, has a smooth surface, and has high strength.

[Background technology] Asbestos (1) is used as reinforcing fiber for cement. , glass fiber, and various other materials are used.

Searches have been made for reinforcing fibers to replace these fibers. Under such circumstances, the present inventors have attempted to manufacture a fiber-reinforced cement hardened body using carbon fibers. However, in such a case, when the raw materials are mixed using standing water, the carbon fibers become entangled with each other and form a ball shape, making it impossible to mix uniformly. This phenomenon cannot be avoided even if a highly efficient mixing device is used.As mentioned above, when carbon fibers are shaped into a ball to produce a cured product, the surface of the cured product becomes The appearance becomes uneven, and the reinforcing effect is not sufficient. Therefore, this carbon fiber is used only when the mixture has a high water content, or when the amount of water mixed is small, the mixing time is shortened to prevent it from forming into a ball shape. However, although this method can prevent unevenness on the surface of the cured product, it is still not possible to achieve a sufficient reinforcing effect. The present invention was made in view of such circumstances.

(2) [Disclosure of the Invention] This invention provides a method for manufacturing a fiber-reinforced cement hardened body by adding 0.5 to 8% by weight (hereinafter abbreviated as %) of wood fibers and 0.1 to 8% by weight of cement to cement. It is characterized by blending 2% carbon fiber with other additives, fillers, etc. if necessary, mixing with water, shaping, and curing.

Here, the cement may be any one such as ordinary Portland cement and blast furnace cement.

There are no limitations on the carbon fibers, and any manufacturing method, fiber length, thickness, etc. may be used.

The wood fiber preferably has a fiber diameter of 21 or less and a fiber length of 5.
Use pulp, wood flour, wood wool, wood chips, etc. of ++n or less. Therefore, it is not necessarily necessary to have a perfect fiber morphology.

The amount of water to be mixed cannot be strictly determined as it varies depending on the shaping method employed, but it is usually sufficient if it is 30 parts or more per 100 parts by weight of cement (hereinafter referred to as "parts"). If it is less than 30 parts, uniform mixing will not be possible and there will often be problems in shaping (3).

Silica sand, calcium carbonate, talc, an AE agent, a water reducing agent, an antifoaming agent, etc. are used as fillers and additives to be added as necessary. The amount, method and timing of addition of each of these are determined depending on the purpose of use.

The mixing device employed in the present invention is not limited in any way, but stirring devices equipped with blades having sharp cutting edges should be avoided as much as possible since they will damage the fibers.

As explained above, the present invention applies 0.0% to cement when producing a fiber-reinforced cement hardened body. 5-8% wood fibers, 0.1-2% carbon fibers, and other additives, fillers, etc., if necessary, are mixed with water, shaped,
Since it is characterized by curing, it was possible to improve the strength of the cured fiber-reinforced cement product, and also improve the smoothness of the surface of the cured product.

Examples 1 to 5 and Comparative Examples The formulations shown in Table 1 were used. Note that comparative examples are also described.

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Claims (1)

[Claims] (1) In the method of manufacturing a fiber-reinforced cement cured body, 0.5 to 8% by weight of wood fibers, 0.1 to 2% by weight of carbon fibers, and other additives and fillers if necessary, are added to the cement. A method for producing a hardened fiber-reinforced cement product, which is characterized by blending the above ingredients, mixing them with water, shaping them, and hardening them.