JPH03232752A - Hydraulic composition - Google Patents

Abstract

PURPOSE:To provide the title composition capable of giving concrete with improved quick settability and wear resistance, comprising hydraulic composition comprising a calcium fluoroaluminate of the formula and a reactive siliceous material, inorganic sulfate and cement. CONSTITUTION:The objective composition comprising (A) a cement admixture made up of (1) a hydraulic composition comprising (a) a calcium fluoroaluminate of formula XCaO.YAl2O3.ZCaF2 [x:y:z=1:(0.65-1.5):(0.01:0.32)] and (b) a reactive siliceous material and (2) an inorganic sulfate and (B) cement.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hydraulic composition, a cement admixture, and a cement composition used mainly in the civil engineering and construction fields.

[Conventional technology and issues]

Currently, cement is used for a wide range of purposes in the civil engineering and construction fields, and the needs for cement concrete technology are becoming increasingly diverse.

Along with this, various performances have come to be required of cement and concrete, such as rapid hardening required for emergency construction and water stop construction, and abrasion resistance required for materials such as roads and factory floors. is one of them.

Conventionally, various admixtures and admixtures have been used as materials that cover the performance of cement. However, for example, most of them were aimed at improving a single function or performance, with the exception of the AEi water preparation, which has both an AE function and a water reduction function.

The same applies to rapidly hardening materials and wear-resistant materials, and it has not been possible to improve the performance of both materials at the same time with a single admixture.

In view of the current situation, the present inventors conducted various studies, and as a result, they obtained the knowledge that a specific composition improves both the rapid hardening properties and the abrasion resistance of concrete, and completed the present invention.

[Means to solve the problem]

That is, the present invention provides xCaO.yAl, 0.・zCaF2
(However, x/y/z = 110.65 to 1.510
．． 01 to 0.32) and a reactive siliceous substance, and a cement admixture containing the hydraulic composition and an inorganic sulfate as main components. , and furthermore, a cement composition containing the cement admixture and cement as main components.

The present invention will be explained in detail below.

xCaO-yA1zo3・zcaF2 in the present invention
(However, x/y/z = 110.65 to 1.510
．． Calcium fluoroaluminate shown by 0.01 to 0.32) is produced by calcining various raw materials mainly composed of calcareous material, alumina material, and fluoride, and reducing the amount of CaO181 in the product after calcination.
□If the molar ratio of 03 and CaF is 1, then A
1. (h is 0.65-1.5, CaF2 is 0.01-0
．． It is obtained by blending the mixture so that it becomes 32% and firing it at 1,000°C or higher. Practically speaking, it is further crushed and classified to obtain an appropriate particle size, for example, 1,000 in plain size.
~B,000cti/g is preferable.

The ratio of Cab, Al□03, and CaFz must be within the above range, and if it deviates from the above range, the wear resistance, which is one of the objects of the present invention, will be insufficient.

The firing method is not particularly limited, but
For example, an electric furnace or a rotary kiln may be used, and the firing time is not particularly limited.

The method for cooling the baked product is not particularly limited either, and any method such as a rapid cooling method using water or high-pressure air, or a slow cooling method by leaving the product to stand can be used.

Further, the product can be used regardless of whether it is crystalline or amorphous, and the presence of other components or impurities is not particularly limited. Especially when considering industrial processes, 5iOz and Fe2O are used as other components from industrial raw materials.
3. Although it is expected that Tie□, MgO, SO, etc. are mixed, the amount of these mixed is usually less than 20% by weight, which impairs the physical properties of the hydraulic composition, cement admixture, and cement composition of the present invention. It's not a thing.

The reactive siliceous materials used in the present invention include activated silica, opalescent silica, silica hume, colloidal silica, diatomaceous earth, Aerosil, silica gel, vitreous No. 1.2 and 3.4 sodium silicate, crystalline meth There are sodium silicate-based substances such as sodium silicate, sodium orthosilicate, and sodium pyrosilicate, and it is possible to use one or more of these. Among them, sodium silicate substances have a composition with a molar ratio of N
azO/SiOg=0.1 to 5.0 is preferable, and 0.2
-1.1(7) is more preferable, and can be used in powder form or solution form.

The amount of reactive siliceous material used is 5 to 300 parts by weight, preferably 10 to 200 parts by weight, based on 100 parts by weight of calcium fluoroaluminate. If the amount used is other than this, it is difficult to obtain a favorable effect in terms of wear resistance.

Although the particle size of the reactive siliceous material is not particularly limited, it is usually preferably 5 μm or less.

The inorganic sulfate used in the present invention refers to an alkali metal or alkaline earth metal sulfate, and preferable examples thereof include anhydrous, semi-aqueous, and double calcium sulfate. Particularly preferred are those that are sparingly soluble or insoluble.

The amount of inorganic sulfate used is 50 to 500 parts by weight, preferably 100 to 300 parts by weight, based on 100 parts by weight of the hydraulic composition.
Parts by weight. If it is less than 50 parts by weight, the rapid hardening is insufficient, and if it exceeds 500 parts by weight, the abrasion resistance tends to be insufficient.

The cement used in the present invention includes various types of Portland cement such as normal, early strength, and ultra early strength, various mixed cements made by mixing Portland cement with blast furnace slag, fly ash, or silica, or cements made by adding an expansive agent to Portland cement. Special cements such as expanded cements and even alumina cements.

The amount of cement used is preferably 200 to 00 parts by weight per 100 parts by weight of the cement admixture; less than 200 parts by weight is economically unfavorable, and if it exceeds 5,000 parts by weight, rapid hardening performance may fail. It will be enough.

The present invention further includes a setting regulator, aggregates such as silica sand, natural sand, and gravel, fibers such as glass fiber, carbon fiber, and steel fiber, polymer emulsion, rubber latex, coloring agent, and pigment. , AE agent, water reducing agent, AE water reducing agent, fluidizing agent, rust preventive agent, inseparable admixture in water such as methylcellulose, thickener, water retention agent, waterproofing agent such as calcium chloride and sodium silicate, foaming agent, One or more of foaming agents, antifreeze agents, etc. can be used in combination as long as they do not substantially impede the object of the present invention.

Specific examples of setting regulators include organic acids such as citric acid, tartaric acid, gluconic acid, succinic acid, and maleic acid or their salts, alkali carbonates, phosphoric acids or their salts, boric acid, alkali borates, and silicofluorides. , starch, sugar, alcohols, and mixtures thereof, and one or more of these can be used, and among them, organic acids are preferably used.

The amount of setting regulator used is 0.1 to 30 parts by weight per 100 parts by weight of the hydraulic composition to obtain an appropriate pot life (working time) of several tens of minutes to several hours. be able to.

Any existing stirring device can be used to mix the hydraulic composition, cement admixture, and cement composition.

For example, a tilting mixer, an omni mixer (manufactured by Chiyoda Giken Kogyo Co., Ltd.), a V-type mixer, a Henschel mixer, a Nauta mixer, etc. can be used. In addition, each material may be mixed at the time of construction, or some or all of the materials may be mixed in advance.

Construction using the cement composition of the present invention may be carried out in accordance with conventional mortar or concrete construction, and no special equipment or construction methods are required.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 Commercially available calcium carbonate as a calcareous raw material, commercially available alumina as an alumina raw material, and Wako Pure Chemical's reagent special grade calcium fluoride as a fluoride raw material were mixed and heated in a platinum crucible using an electric furnace at 1,700°. After firing under conditions of C12 hours, it was dropped into water and rapidly cooled. Next, the obtained product was pulverized to a size of 88 μm or less to produce various calcium fluoroaluminates, which were subjected to tests. The analysis results of the product are shown in Table 1.

Next, 100 parts by weight of various calcium fluoroaluminates, 100 parts by weight of a reactive siliceous material, and 200 parts by weight of an inorganic sulfate.
Parts by weight, 10 parts by weight of setting regulator, 1.200 parts by weight of cement, and 3,000 parts by weight of aggregate were prepared, and W/C=5.
5%, and the strength and abrasion resistance were measured.

(Materials used) Reactive siliceous substance a rainbow sulfate, by-product inorganic sulfate during ferrosilicon production: ■ type anhydrous sulfur, Blaine value 5,900
crl/g Cement: Ordinary Portland cement, manufactured by Andes Cement Co., Ltd. Setting regulator: Reagent, sodium gluconate aggregate:
Toyoura standard sand (measurement method) Compressive strength and abrasion resistance: Based on JIS R5201. However, the curing conditions are 20'CX65%RH.

: Using a 7-day-old specimen, the wear resistance was examined using a taper wear tester using a wear wheel H-22, a load of 250 g, and a rotation speed of 2,000 times.

The results are shown on the axis of wear amount/2,000 times).

Example 2 The experiment of Example 1 was carried out as in Example 1 except that calcium fluoroaluminate of kl-10 was used and the reactive siliceous material was varied. The results are shown in Table 2.

Table 2 (Materials used) Reactive siliceous substance b: Reagent, sodium silicate C; Reagent, sodium metasilicate d Niopal silica e: Reagent, silica gel Example 3 Using the formulation of experiment kl-10 of Example 1, cement )2,40
Example 1 was carried out in the same manner as in Example 1, except that the amounts of 0 parts by weight, 6.000 parts by weight of aggregate, and inorganic sulfate were changed.

The results are shown in Table 3.

Table 3 Example 4 The same procedure as in Example 1 was carried out except that the amount of setting regulator was changed in the formulation of Experiment No. 1-10 of Example 1. The results are shown in Table 4.

Table 4 Example 5 Experiment of Example 1 The experiment was carried out in the same manner as in Example 1 except that the amount of cement was changed in the formulation of Nα1-10.

The results are shown in Table 5.

Table 5 〔Effect of the invention] According to the present invention, Fast development of strength, Excellent wear resistance A hydraulic composition having properties is obtained.

Claims (3)

[Claims] (1) xCaO・yAl_2O_3・zCaF_2 (however, x/y/z=1/0.65~1.5/0.01~
0.32) A hydraulic composition whose main components are calcium fluoroaluminate and a reactive siliceous substance. (2) A cement admixture containing the hydraulic composition according to claim 1 and an inorganic sulfate as main components. (3) A cement composition containing the cement admixture according to claim 2 and cement as main components.