JPS60195046A - Cementitious self leveling material 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 The present invention relates to a cementitious self-leveling material composition,
To provide a cement-based self-leveling material that exhibits excellent fluidity when kneaded with water, forms a uniform smooth surface especially as a material for cast flooring, and can harden in a short time to develop desired initial strength. It is.

Conventionally, after concrete is poured and hardened, its surface is leveled (smoothed) with a trowel using cement mortar, which requires the labor and time of skilled plasterers to finish. On the other hand, in recent years, a cement-based self-leveling material has been developed that forms a smooth surface by the natural flow of the mixed material by simply pouring the mixed material with good fluidity onto the concrete surface.

In other words, such cement-based self-leveling materials are required to have excellent fluidity necessary for pouring, to form a uniform smooth surface through natural flow, and to harden within an appropriate amount of time to quickly develop strength. . Generally, when a cement-based self-healing material is kneaded with more water, it becomes softer and its fluidity (flow value) increases. However, when the amount of kneading water increases, the initial strength (1 to 2 days) of the cement-based self-leveling compound inevitably decreases, and the amount of breathing increases, resulting in a loss of workability and workability. Therefore, it is desired that the cement-based self-leveling material exhibits a fluidity ()0-value of a predetermined value or higher, and at the same time, the initial strength is not reduced as much as possible.

In view of the above, the present inventors conducted intensive research and found that chlorzone (chlordan) was added to the conventional cement mortar composition.
The inventors have found that by blending e), a desired cementitious self-leveling material with a small decrease in initial strength despite an increase in flow value can be obtained, and the present invention has been provided. That is, the present invention is a cement-based self-leveling material composition made by blending an indene compound into a cement-based mortar composition, which exhibits excellent fluidity when kneaded with water, and particularly has a flow value of 19 crrL or higher to achieve a desired initial stage. It can demonstrate strength.

As the cement mortar composition of the present invention, conventionally known ones can be used without particular limitation, such as powdered amorphous silica such as Portland cement, fly ash, etc.
Industrial water) A cement composition for plastering that does not cause cracks and has gypsum as its main component is preferred. Generally portland cement 10
A cement composition is used comprising 01 parts by weight, 5 to 45 parts by weight of fly ash, and 1 to 44 parts by weight of water gypsum.

In the cement-based mortar composition as described above, one or more general additives such as an aggregate dispersant and a water retention agent may be added as other components depending on the needs.

In addition to ordinary fine aggregates such as sea sand, river sand, and crushed stone,
By using a special microporous fine aggregate containing silica and alumina, which are mostly amorphous substances, preferably having a water absorption rate of 2 to 20%, a grain size of 5 mm or less, such as slag, whitebait, causal sand, or pearlite, It is possible to obtain a cement-based self-leveling material that does not cause cracks for a long period of time.

In addition, as a dispersant, a known water reducing agent or/and A'H
For example, aryl sulfonates, alkylnaphthalene sulfonates, lignin sulfonates, phosphoric acid ester surfactants, melamine sulfonate complexes (condensates), naphthalene sulfonate condensates, polyesters, etc. Alkylaryl sulfonates, highly condensed triazine compounds, etc. may be used alone or in combination of two or more. Particularly, in the cementitious self-leveling material composition of the present invention, it is extremely effective to combine the indene compound described below with a dispersant such as at least a highly condensed triazine compound or a melamine sulfonate composite. The blending ratio of such a dispersant may generally be 0.1 to 0.5% by weight based on the main components of the cement mortar composition described above.

Furthermore, cellulose-based, vinyl-based, and acrylic-based compounds are generally used as water-retaining agents, with methylcellulose being preferred.

Cellulase such as hydroxyethylcellulose, hydroxypropylcellulose, methylhydroxyethylcellulose, and hydroxypropylmethylcellulose is generally contained in a proportion of 0.1 to 0.1 to the main component of the cement mortar composition.
It is used in a range of 5% by weight.

In addition, dispersion aids, antifoaming agents, hardening modifiers, viscosity Ii1. +J
Known additives such as conditioners and antifreeze agents can also be appropriately blended as needed.

Corresponding cement-based self-leveling materials have already been proposed in which the above-mentioned cement-based mortar compositions are adjusted by selecting various additives such as dispersants.

Therefore, in the present invention, it is extremely important to blend an indene compound into the cement-based mortar composition without any particular restriction in order to exhibit desired fluidity and initial strength. The indene compound used in the present invention is chlordane (ahlordane) shown in Examples.
) as well as chlorane (Hexachlor
), Heptachlor.

Various chlorine derivatives such as nonachlor, chlorine-free compounds with the same structure as indane or indene compounds,
Derivatives thereof can also be used. The larger the indene compound is added to the mortar composition, the more effective the fluidity and initial strength of the resulting self-leveling material will be. 0.005 to 4% by weight, preferably 0.01 to 2% by weight are sufficient.

The order in which the indene compounds are added to the cement mortar composition of the present invention is not particularly limited. For example, when used as a cement-based cell 7 level link material, it is convenient to mix a predetermined proportion of an indene compound into a cement-based mortar composition prepared in advance. Furthermore, when a liquid dispersant or the like is used, it is also preferable to prepare the dispersant and the indene compound in advance and mix them into the cement mortar composition in the same manner as above. Of course, the cementitious self-leveling composition may be prepared by simultaneously blending the cementitious mortar composition and the indene compound.

Examples are shown below, but the present invention is not limited to these Examples in any way.

Example 1 Using Portland cement (manufactured by Tokuyama Soda Co., Ltd.), a cement mortar composition was prepared in the proportions shown in Table 1 below.

Table 1 The above mortar composition was added as a dispersant (N-high condensed triazine compound (ML-4000, manufactured by Ell Master Builders) + (B) Melamine ax sulfonate composite (IP-201, Hozolis Bussan Co., Ltd.) (manufactured by Everwood Emulsion 0-200) or chlordane (Everwood Emulsion 0-200
．． Each cement-based self-leveling material shown in Table 2 was prepared in combination with 0.01% by weight (manufactured by Shinto Paint Co., Ltd.).

Next, each of the cement-based self-leveling materials shown in Table 2 was kneaded with water in a given device, and the fluidity (flow value) and initial strength (material age 1 to 2 days) of a 30% slurry were measured. In addition,
The flow value test method is to place a PVC pipe (50A, inner diameter 50mm + height 54mm) on polished glass (5 inch thick).
m1), filled with the kneaded slurry, pulled up the pipe, and after the spread of the kneaded slurry had stopped, the diameters in two perpendicular directions were measured and the average value was calculated. In addition, the initial strength is shown as the compressive strength after 24 hours (1 day) and 48 hours (2 days) using a test specimen according to the strength test of J-K5R5201-9.

Claims (1)

[Scope of Claims] 1) A cement-based self-leveling material composition formed by blending an indene compound into a cement-based mortar composition. 2) The scope of claims that the cement-based mortar composition is characterized by cement, fly ash, and gypsum. Claim 2, wherein the cement-based self-leveling material composition according to item 1) 3) The cement-based mortar composition contains one or more general additives such as a dispersant, a water retention agent, and an aggregate. 4) Cement-based self-leveling material according to claim 3, wherein the dispersant is a water reducing agent of a highly condensed triazine compound or a melamine sulfonate-based composite. Composition 5) The cement-based self-leveling material composition according to claim 3, wherein the water retention agent is cellulose ethers. 6) The aggregate is at least one selected from sea sand, dirty sand, silica sand, and slag sand. 7) Cement-based self-leveling material composition according to claim 3, which is a seed process; 7) Cement-based self-leveling material according to claim 1, wherein the indene compound is a compound containing chlordane as a main component. Composition