JPS61205654A - Superhigh strength cement concrete composition - 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 [Industrial Application] The present invention relates to ultra-high strength cement concrete compositions. More particularly, it relates to an ultra-high strength cement concrete composition characterized by a cementitious material, an ultra-fine powder, a high-performance water reducing agent, water and a ceramic pulverized product.

[Prior art]

High-strength cement compositions consisting of cement, ultrafine powder, high-performance water reducing agent, and water-Q are well known (Japanese Patent Publication 55-500863).
). Generally, concrete is a composite material of the above-mentioned composition and aggregate, so its compressive strength is greatly influenced by the strength of the aggregate. Therefore, there is a strong need for the development of an ultra-high-strength cement concrete composition that combines high-strength, easily available, and economical aggregates.

[Problem that the invention seeks to solve]

Based on the above, the present inventors conducted various studies and found that by combining cement, ultrafine powder, high-performance water reducing agent, water, and crushed ceramics, an ultrahigh-strength and heat-resistant material can be created. The present invention was completed based on the knowledge that it is possible to obtain excellent cement concrete.

[Means for solving problems]

The present invention consists of a cementitious material, an ultrafine powder, a superplasticizer, water, and a ground product of ceramics.

The present invention will be explained in detail below.

The cementitious materials referred to in the present invention include various Portland cements such as normal, early strength, super early strength, white or sulfate resistant,
Furthermore, mixed cement containing blast furnace slag, fly ash, etc. is generally used. In addition, it is also possible to use together a material that compensates for shrinkage using expansive cement, a material that develops the required strength in a short period of time using rapid hardening cement, and a high-strength gypsum-based admixture.

The expansion component of the expansion cement is an ettringite type, such as Denki Kagaku Kogyo's reverse product name "C8Asu20".
, or calcined CaO is preferable, and among calcined CaO, 110
It is preferable that the crystal be fired at a temperature of 0 to 1300°C and have an average crystal diameter of 10 μm or less.

The quick-hardening component of quick-hardening cement is preferably calcium aluminate-based, such as alumina cement, a combination of alumina cement and gypsum, and electrochemical cement.
Back side product name "Denka E8J and Onoda Cement product name"
"jet cement" etc. are used.

The high-strength admixture is a gypsum-based material, such as Denka Σ-1000J manufactured by Denki Kagaku Kogyo Co., Ltd., and Asano Super Mix manufactured by Nippon Cement ■, which are effective. 1. The ultrafine powder used in the present invention is a cementitious material (
It is preferable to have an average particle diameter that is at least one order of magnitude smaller (average particle diameter of about 20 to 30 μm), or two orders of magnitude smaller in average particle diameter from the viewpoint of flow characteristics of the mixed material. Specifically, silica dust (silica fume) and siliceous dust, which are produced as by-products during the production of silicon, silicon-containing alloys, and zirconia, are particularly suitable, including calcium carbonate, silica gel, and opal: i[:;i? ' = (Alonicum hytethane oxide, etc. can also be used. In particular, the use of opalescent silica, fly ash, ultrafine powder pulverized by a jet mill with a slag classifier, etc. is effective from the viewpoint of improving curing shrinkage.

The amount of ultrafine powder used is preferably 40 to 5 parts by weight, more preferably 6 to 95 parts by weight of the cementitious material.
The amount is 35 to 10 parts by weight compared to 5 to 90 parts by weight. If it is less than 5 parts by weight, the effect of developing high strength will be small;
If the amount exceeds 1 part by weight, the fluidity of the mixed wire material will be significantly reduced, making it difficult to mold it, and also resulting in insufficient strength development.

The high-performance water reducing agent in the present invention is a surfactant with a large dispersion ability that does not cause too much delay in setting or excessive air entrainment even when added to cement in large quantities. Salts, salts of melamine sulfonic acid formaldehyde condensates, high molecular weight trigeninsulfonic acid salts, polycarboxylic acid salts, etc. are mentioned. Conventionally, the amount of high-performance water reducing agent used is 0.3 to 1 weight as solid content to cementitious material, but in the present invention, it is preferable to add a larger amount than that. More preferably 1 to 5 parts by weight. A high-performance water reducing agent is necessary to obtain a kneaded product with a low water/(cement + ultrafine powder) ratio, and if it exceeds 10 parts by weight, it will adversely affect the curing reaction.

In the amount of high-performance water reducer used, by combining ultrafine powder, the water/(cement + ultrafine powder) ratio can be reduced to 2.
Even if the amount is less than 5%, a fluid mixed material that can be molded by a conventional method can be obtained.

The amount of water used in the present invention is necessary for molding, and in order to obtain a high-strength hardened product, the amount of water used is as small as possible.12.
It is preferably 5 to 30 parts by weight, and more preferably 15 to 28 parts by weight. If the amount of water is more than 30 parts by weight, it will be difficult to obtain a high-strength cured product, and if it is less than 12.5 parts by weight, it will be difficult to mold by ordinary pouring or the like. In addition, in compression molding, etc., it is not limited to this, and molding is possible even when the amount is less than 12.5 parts by weight. Also,
It is also possible to use forming methods normally used for cement concrete, such as extrusion.

The pulverized ceramic products of the present invention are those obtained by pulverizing ceramics to a predetermined particle size, and in particular, pulverized products of defective products produced in ceramic factories are economical. It is also possible to use crushed ceramics that have been fired for the purpose of making aggregates. The particle size is suitable for use as aggregate for general concrete (preferably 13m or less. Ceramics here include porcelain, earthenware, stoneware, and earthenware, but from the viewpoint of mechanical strength, porcelain is usually used. Preferably, those classified as porcelain, pottery, or serpentine.For example, porcelain is
There are hard porcelains such as high-grade tableware, high-voltage insulators, and scientific tools, and soft porcelains such as low-voltage insulators, architectural tiles, tableware, and arts and crafts. Ceramics include sanitary ware, tableware, architectural tiles, arts and crafts, etc. There are pump parts, reaction tubes, ceramic tubes, drainage pipes, exterior tiles, etc., and the aggregate for the purpose is obtained by crushing the defective products produced at the factories that manufacture these. is possible. Of course, in order to obtain the desired aggregate from the beginning, it is also possible to perform firing and pulverization in the same way as ceramics.

In other words, a method in which a mixture of clay, quartz, feldspar, pottery stone, etc. is molded and dried and then sufficiently baked at a high temperature of about 1,300 to 1,450°C until a part of it is dissolved; Contains stones and small amounts of feldspathic raw materials,
1. A method of baking at a temperature of 200 to 1.300°C or higher, or a method using low-grade clay, that is, clay containing quartz or iron as the main component.1. It is also possible to pulverize a lump obtained by a method of baking at a temperature of about 1.300° C., and in this case, it is also possible to use a glaze, including double baking.

In addition, special ceramics such as cordierite, zirconia,
It is preferably 500 parts by weight based on 100 parts by weight of zircon porcelain, Richa porcelain, and steer.

If it exceeds 500 parts by weight, the amount of water required to obtain a certain level of fluidity increases, making it difficult to obtain high strength.

In addition to the above-mentioned combinations, it is also possible to mix fibers and nets of each strain.

Examples of fibers include steel fibers, stainless steel fibers, various natural and synthetic mineral fibers such as asbestos and alumina fibers, carbon fibers, glass fibers, and natural or synthetic organic fibers such as polypropylene, vinylon, acrylonitrile, and cellulose. It will be done. It is also possible to use conventionally used steel rods or FRP rods as reinforcement, and these are especially indispensable for Ooboro's assembly surface plate.

In addition, it is also possible to add so-called solid lubricants such as molybdenum disulfide and hexagonal boron nitride to provide other functions, such as sliding properties. It is also possible to use

In addition, it is also possible to incorporate substances that impart special properties such as thermal conductivity and electrical conductivity. The above-mentioned materials may be mixed and kneaded by any method as long as they can be mixed and kneaded uniformly, and the order of addition is not particularly limited.

Various curing methods are possible for curing the molded product, including room temperature curing,
Any of the methods of normal pressure steam curing, high temperature and high pressure curing, and high temperature curing can be employed, and if necessary, a combination of these methods can be used to obtain a high strength cured product.

The cementitious substances, ultrafine powder, high performance water reducing agent,
F) by combining water and ceramic pulverized products.1.
It is possible to stably obtain ultra-high strength of 300 Kyt/d or more, and due to improved heat resistance, it is possible to fire up to about 00°C, and it is also possible to glaze.

It is also possible to obtain a product by rehydrating a glazed and fired product.

The above composition can be used in places where ultra-high strength and heat resistance are required, and by glazing it can be used in places where functionality, aesthetics, and surface properties are required. . Examples of the former include flooring in factories that require heat resistance, molds for presses, and pouring molds; examples of the latter include building materials and molds for injection molding. .

〔Example〕

The present invention will be explained below with reference to Examples.

Example 1 Each piece of ceramics produced by a ceramic factory produced defective products, which were crushed using a crusher to a particle size of 1.2 am or less. ) After kneading and defoaming, 4X4X15.
A specimen was constructed. In addition, curing is at 20℃801RH
One day later, it was cured in a humid air at 50°C for 3 days. The results are shown in Table 1, and high strength can be achieved by using crushed ceramic aggregate.

In the table, Experiment AI, 2.5 is a comparative example, Experiment 43.4.6.
7.8 Materials used in the examples of the present invention> Cement: White Portland cement (manufactured by Chichibu Cement Co., Ltd.) Ultra-fine powdered rainbow kahuyum (manufactured by Nippon Heavy Industries, Ltd.) High performance water reducing agent: β-naphthalene sulfonate formalin condensate based cellulose 110P, (Daiichi Kogyo Seiyaku) Ceramic crushed product: 1.2 m or less Silica Sand: No. 3.4.5 silica sand (mixed in equal amounts) Water: Tap water Create a sample, 1 day at 20°C in humid air, 3 days at 50'C in humid air, then 100°C
After drying for one day, the bending strength was measured. Furthermore, 400℃,
500℃, 700t? : The bending strength was measured after being left at 900°C for 20 minutes. In addition, the test was conducted with a span of 8o, and it was found that it exhibited excellent strength even at high temperatures, as compared to Toyo.

Example 3 Using the formulation of Experiment 14, a prototype mold for press molding as shown in the diagram was prepared by pouring, and a press test was conducted on a 2-inch thick steel plate. In the drawing, 1 is a steel frame, and 2 is a frame manufactured according to an example of the present invention using the experimental composition 4. This mold was set in a press machine manufactured by Kawasaki Yuko 600PP-123, and a P pressure of 300 tons, a C pressure of 60 tons, and a 2 cm thick copper plate was pressed. It was possible to press-form a steel plate, and a product was obtained. I was able to do that.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to obtain ultra-high strength cement concrete that is stable, has excellent heat resistance without decreasing bending strength even at high temperatures, and can be fired at high temperatures. Possible ultra-high strength cement concrete compositions and products can be obtained.

[Brief explanation of drawings]

The drawing is an example of a cross-sectional view of the press die of the present invention. sign

Claims (1)

[Claims] 1.) Ultra-high strength cement concrete composition consisting of cementitious material, ultrafine powder, high performance water reducing agent, water and ceramic pulverized product.