JPS5973907A - Manufacture of carbon fiber reinforced precast inorganic pr-oduct - 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 The present invention relates to a method for producing a precast product of carbon fiber reinforced inorganic material, particularly a precast product with multiple upright parts such as an L shape or a mouth shape.

A commonly used method for manufacturing precast inorganic products is to pour an inorganic material into a mold and compact it by applying vibration to the mold.

By the way, in the conventional construction method, when a highly viscous material such as carbon fiber reinforced inorganic material is poured into a formwork with many upright parts, such as an L-shaped or mouth-shaped formwork, the many upright parts are tightened by vibration. Since hardening did not work effectively, many air bubbles remained on the finished surface, resulting in a loss of beauty and quality of the product.

In view of the above circumstances, this invention has developed a method for manufacturing L-shaped or U-shaped products whose convex side is the finished surface by taking advantage of the high viscosity of carbon fiber-reinforced inorganic materials. be.

The present invention will be described below with reference to the drawings. A formwork 1 that can be bent freely by means of a hinge or the like is installed horizontally as shown in Fig. 1, a carbon fiber reinforced inorganic material 2 is poured in, and a vibrator 3 The formwork 1 is vibrated to expel air bubbles 4 caught in the material. Next, as shown in FIG. 2, after leveling the top of the material 2, a top lid 5 is attached which prevents the material from falling and is rigid enough to withstand lateral pressure. Before the material begins to harden, bend the formwork 1 as shown in Figures 3 to 5, remove and fix the material protruding inside the corners. It is determined by controlling the flow value p, which is determined from the relationship between the difference and fluidity, and is usually about 2 hours after pouring.

The method of bending is to raise the two sides of the formwork (Figure 3).

How to raise only one side based on the dimensional relationship between the two sides (Figure 4)
In order to achieve the desired dimensional stability of the product, there are methods such as folding at two places and raising both sides to form a mouth shape (Fig. 5). The carbon fibers serving as the 4° reinforcing material are pitch-based staple fibers with a length of 3 to 30 + u and a diameter of 15-25/17. Further, the inorganic material is a cement matrix using silica sand or the like as an aggregate.

The mouth-shaped or mouth-shaped precast product obtained by the manufacturing method of the present invention is used as a permanent formwork for concrete pouring as a member such as a pillow shape, a beam shape, or a part of a wall corner, or as a thin PC board.

As described above, in the method of the present invention, the material can be poured easily since there is no upper lid 5 as shown in FIG. 1 when pouring the material. It is possible to omit the process of pouring the difference material and finishing. Furthermore, vibration compaction can be easily managed, increasing production efficiency. -Since the product is cured in an autoclave after the next molding, the product has high dimensional stability. Moreover, it has the excellent effect that it is possible to obtain a high-quality product with no surface bubbles in a member whose finished surface is the most characteristic mouth shape or the convex side of the mouth shape.

[Brief explanation of drawings]

Condition, Figure 2 shows the state with the top cover attached, Figures 3 to 5
The figure shows the formwork in a bent state, and FIG. 6 is a graph showing the relationship between various secondary curing and the rate of change in length of the inorganic board. 1. Flexible formwork 2. Carbon fiber reinforced inorganic material 3. Vibrator 4. Air bubbles in the material 5. Top lid formwork

Claims (1)

[Claims] After pouring the pitch-based carbon fiber-reinforced inorganic material into a horizontally installed formwork that can be bent freely, the top lid is placed. Before the material hardens, the formwork is bent to perform primary forming, and after the material hardens, the molding process is carried out. Then, the primary molded product is heated to a high temperature of 150 to 200°C.
A method for producing a carbon fiber-reinforced precast inorganic product having a rising portion characterized by high-pressure steam curing.