JPS58161961A - Lightweight body 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 foam-hardening composition for lightweight bodies, and more particularly, to obtaining a composition for lightweight bodies made of concrete or mortar and having extremely excellent fire resistance. It has characteristics.

When manufacturing lightweight foamed bodies from cement, it is common to use hydraulic silicate limestone cement and mix a foaming agent with it to obtain the desired product, but the resulting lightweight bodies tend to shrink significantly. Due to its weak mechanical strength and low fire resistance, it was not particularly suitable for architectural applications. Therefore, conventionally it has been used exclusively in the form of non-foamed lightweight concrete or in the form of lightweight concrete or lightweight mortar mixed with lightweight aggregate, but the former! The i-type was heavy, and the lighter the handler's m-type, the lower the mechanical strength and poor adhesion.

The present invention has been made to improve the above-mentioned drawbacks. That is, the present invention provides (a) hydraulic silicate limestone cement (hereinafter referred to as component (a)), (b) inorganic powder with a high degree of hydration (hereinafter referred to as component (b)), and (C) a metal foaming agent. (hereinafter referred to as component (C)) is the main! As an ingredient,
When water is added to this component system to form a phlegm paste,
The hydration hardening reaction progresses with gradual foaming, and the lightweight body obtained from such components is extremely lightweight, has little expansion and contraction due to drying shrinkage and temperature changes, and has high mechanical strength even at the initial stage. shows the property that gradually increases,
The adhesion with each Nsg material is also good, and especially the fire resistance performance is significantly improved. Component (a) used in the present invention is Portland cement, early strength Portland cement,
It refers to single cement such as medium-temperature Portland cement, mixed cement such as blast furnace cement, silica cement, fly ash cement, and sulfate slag cement. Next, the component (b) is a crystalline hydrated compound such as allophane, boehmite, porcelain, brucite, siburite, colemanite, diaspore, gibbsite, gibbsam, halloysite hyurandite, kernite, morbunite, vermiculite, ettringite and empriite. Examples include mineral powders with a high carbon content and mineral powders with high mineral density. As the metallic foaming agent of component (C), simple metals, alloys, and intermetallic compounds can be used relatively arbitrarily. These (a)
~(C) component shall be blended in the necessary powder form when blending, and usually (b) is added to 100 parts by weight of component (C).
Ingredient 20-. Approximately 200 parts by weight, component (C) is 0.7~
It is desirable that the amount is about 70 parts.

When water is blended with the above components (a) to (C) to form a paste, it usually has a concentration of 0.5 to 720, although it varies depending on the blending ratio.
The cement component in the mixture undergoes a gradual hydration hardening reaction before or after the completion of foaming, and at the latest within 2 minutes.
Within a few days, the initial hardening is completed (that is, it exhibits a level of hardness that can be used in practical use), and a lightweight body with a small amount of shrinkage is formed. The lightweight foamed material obtained in this way has excellent compressive strength and bending strength, although this varies depending on its specific gravity, cell size, etc., and this is thought to be due in particular to the influence of component (b). Its mechanical strength gradually improves over time, and it also has good adhesion to various noodle base materials such as metal and wood. In addition, it was unexpected that the lightweight body would expand and contract less due to drying shrinkage and temperature changes, even though the body contains a relatively large amount of crystal water-consonant components such as component (b). In this respect, component (b) is considered to have some effect on the curing mechanism. Furthermore, this composition for lightweight bodies adheres well to substrates such as iron/copper, wood, and concrete, retains its properties well even at high temperatures, and absorbs a large amount of water when subjected to sudden force. Since it has the property of making it difficult to raise the temperature of the coating base, this property can be widely used in fireproof coating applications. Next, adjusting the degree of air bubbles formed within a lightweight body is an important technical aspect when manufacturing a lightweight body with the aim of improving performance such as heat insulation and heat resistance, but as described in (3) above. In addition to component (C), porous inorganic powders such as silica gel, activated carbon, zeolite, and carbon black; mineral powders having a layered structure such as mica, talc, sepiolite, and palygosulskite; A so-called foaming stabilizer such as a surfactant can be appropriately blended as a small amount of the foaming stabilizer, and heat insulation properties and compressive strength can also be improved by blending such a foaming stabilizer.

Examples are shown below.

Example 1 100g of early strength Portland cement, Gibbsite Powder O
g'& 5g of metal aluminum powder! ;00 cc, bubbles were generated after about 100 g minutes, and when observed after being left to stand day and night, it was confirmed that it had hardened.

This lightweight body was taken out of the container and left at room temperature. - There is almost no drying shrinkage in the weekly diameter, and the bulk specific gravity is 0.
At 3 O, the heat conduction system showed 0.0 gkcal/m-h·'c. Also, the pressure of 11 ga is 5. Otsu kg/c777! , the bending strength is 0. Ikg/cm! Met. On the other hand, a composition for lightweight body was prepared in an amount 100 times the above blending ratio, made into a paste, and then applied to a waterproof plywood board to a thickness of about 5m+n.
When observed after a week, the thickness of the lightweight body layer was approximately /mm.
The adhesion to plywood was also good. A gas burner was brought close to the surface of this coated plywood to heat it for 70 minutes to check its fire resistance, and there was no problem with the back surface of the plywood.

Example 2 A lightweight body was manufactured in accordance with the method of Example 1, except that the types and formulations of each category were changed to those shown in Table 1. When the same test as in Example 1 was conducted using the lightweight body thus obtained, the results shown in Table 2 were obtained.

Comparative Example In Example 1, 60g of gibbsite powder was replaced with 30g of alumina powder.
A test for producing a lightweight body was carried out in the same manner as in Example 1, except that the weight was changed to 1.5 g, and although foaming started within the specified time, the foaming ratio was low (1), and it took a long time to harden, so it could not be put to practical use after about 3 days. However, its mechanical strength was brittle, with a bulk specific gravity of 0.52 and a compressive strength of 0.6kg/cm. It was bad enough to happen.

Claims (1)

[Scope of Claims] / A composition for lightweight bodies comprising (a) hydraulic silicate calcareous cement, (b) inorganic powder with a high degree of hydration, (C) a metallic foaming agent and water. ! The inorganic powder with a high degree of hydration is selected from allophane, boehmite, borax, brucite, siburite, colemanite, diaspore, gibbsite, gibbsam, halloysite, hyurandite, kernite, mordenite, vermiculite, ettringite, and emprite. The composition for a lightweight body according to claim 1, which is a type of mineral powder or a synthetic mineral powder thereof. 3. A composition for a lightweight body according to claim 1, further comprising a foaming stabilizer.