JPS58194765A - Inorganic binder - 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] It has been widely known that materials with latent hydraulic properties, such as blast furnace slag, can be used as a binder by adding an alkaline stimulant. In addition, because there is no economically superior product, the current situation is that nothing other than blast furnace cement is widely used.

The present invention aims not only to compensate for the drawbacks of conventional slag-based cement, but also to obtain performance superior to that of ordinary Boltland cement.

The present invention uses materials with latent hydraulic properties, such as steel slag such as blast furnace slag and converter slag, and fly ash generated from thermal power plants, as raw materials for the binder, and at least a portion of these materials are pulverized. te 2.0 0
It shall have a plain specific surface area of 0t1rL2/9 or more.1Then, it contains 1 to 30 parts of alkali metasilicate or alkali metasilicate IJY per 100 parts (parts by weight, same hereinafter) of the raw material as a hardening regulator. It is an inorganic binder characterized by the addition of substances.

As the substance having latent hydraulic properties, the above-mentioned substances are used, and among them, quenched (granulated water) slag, especially slag with a lath ratio of 90% or more and a basicity, is preferable. Converter slag and fly ash can be used as they are. It is possible to use Al20 in converter slag.
Since OaO components are low in fly ash, it is desirable to mix them with blast furnace slag, lime, activated silica, activated alumina, Bortland cement, etc. to adjust the basicity as described above. The fineness of the raw material needs to be 2.000 F2/g or more in plain specific surface area, and if it is less than this, the strength will not be sufficiently developed. There is no particular upper limit on the upper limit, but it is not economical to over-grind, and it is also difficult to be stubborn if the drying shrinkage is large and the bending strength is poor and decreases over a long period of time. Because it will show you.

It is preferable to use up to about 8,000 parts m27 parts.

Hardening regulators include silicates, hydroxides, carbonates, bicarbonates, sulfates, sulfites, nitrates, dinitrates, chlorides, phosphates of alkali metals or alkaline earth metals,
Possible examples include alkaline salts such as organic acid salts. However, in the present invention, among these, an alkali silicate, particularly an alkali metasilicate mainly containing 17 Y is preferable.
I found out that I can give it. Alkali metasilicate contains lithium,
There are sodium salts, potassium salts, etc., but sodium salts are preferred industrially.

Furthermore, it has also been found that when alkali metasilicate is used in combination with other alkaline salts, good results can be obtained in terms of strength development. The alkaline salts used in combination include 1, 2,
No. 3.4 vitreous sodium silicate, crystalline sodium pyrosilicate, sodium orthosilicate, etc., composition range YNa2o/S 10220, 1 to 5.0
(molar ratio) is particularly suitable.

These can be used in powder form or in solution;
The amount added is 1 to 30 parts as alkali metasilicate or a mixture of alkali metasilicate and other alkaline salts to 100 parts of the raw material.

Preferably it is 6 to 15 parts. For other usage amounts,
Strength development is not good.

In the present invention, an organic compound having a sulfone group in the molecule, such as an alkylallyl sulfonate, as a fluidizing agent,
Aromatic polycyclic condensate sulfonate system, water-soluble melamine formalin sulfonate system, lignin sulfonate system, oxyorganic acid salt system, polyol system, polyoxyethylene alkyl ether system, ! All commercially available cement water reducing agents, such as those based on 1111-part alcohols, can be used, especially compounds having sulfonic groups χ in the molecule.
By selectively using J or oxyorganic acid salts, the bending strength can be significantly increased. The amount of cement water reducer added is 0.00 parts per 100 parts of the raw material.
The amount is about 1 to 6.0 parts, preferably 0.2 to 4.0 parts.

It has been pointed out that the disadvantages of slag-based cement include insufficient strength, low surface hardness, large drying shrinkage, and a decrease in strength over a long period of time.The use of the cement water reducing agent described above is effective in improving these problems. It is a method that can be used in combination with the following substances to make it even more refined. Examples of phosphorus compounds include inorganic phosphates, organic phosphorus compounds, and glassy substances containing phosphorus. It is phosphorus fertilizer.

The unique effects of using this are that it reduces drying shrinkage, improves fluidity, and provides strength equivalent to or higher than that of ordinary Portland cement. The amount added is at most 15 parts, preferably 1 to 10 parts, per 100 parts of the raw material, and adding more than that will not improve the effect.

Furthermore, as with ordinary Portland cement, when an organic resin is used in combination, it not only improves chemical resistance such as acid resistance, but also improves adhesive strength, bending strength, and fluidity. Examples of organic resins include natural rubber (NR), chloropreneim (OR),
Styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), methyl methacrylate-butadiene rubber (MBR), butadiene rubber (BR)
Rubber latex such as polyacrylic acid ester (PA
E), polyvinyl acetate (PVA0) and its copolymers, vinylidene chloride/vinyl chloride (PVDc)
, vinyl polyzolopionate (PvP), epoxy, asphalt, rubber asphalt, resin emulsion such as paraffin or a mixed latex of these, mixed emulsion al-Ihacellulose gJ, methylcellulose (MC), polyvinyl alcohol (pvA), polyacrylic Examples include water-soluble polymers (monomers) such as acid salts and furfuryl alcohol, and powdered versions of these may also be added.

The product of the present invention can be used not only in the same fields as ordinary Portland cement, but also in a wider range of fields because it not only has early strength and high strength, but also acid resistance and heat resistance. . For example, it can be used as a lining material for general structures, humid pipes, piles, poles, steel pipe linings, box culverts, etc., as well as marine structures and marine concrete products, as well as lining materials that require acid resistance and heat resistance. .

Examples will be described below.

Example 1 The relationship between the amount of sodium metasilicate added and compressive strength was investigated.

The experimental method was a mortar with cement-sand sedimentation = 1 = 2, cement-water ratio of 240%, curing at 20°C, 80% R, H,
, the specimen was 4x4xi6cm, and the measurement was made using J-K5R5.
The cement used as the raw material was made of 90 parts of granulated blast furnace slag and 10 parts of fly ash and had a fineness of 5.250 cfi. iii
Sodium metasilicate was added to the mixture. The results are shown in FIG.

Ordinary portland cement, just for the heck of it? When similar tests were conducted using the
ffi”, 350/cgf/cIIL in 7 days,
It can be seen from Figure 1 that the binder of the present invention exhibits significantly superior strength compared to ordinary Portland cement.

Example 2 To 100 parts of the same raw material as in Example 1, 1 part of a cement water reducer having a weight ratio of formaldehyde condensate of sodium β-naphthalene sulfonate to sodium gluconate of 4:1 and 72 parts of urea were added. was added, and as a hardening regulator, 16 parts of sodium metasilicate, or 4 parts of sodium metasilicate and 2 parts of No. 6 sodium silicate were used in a mixing stand. Semenodo - sand sediment 1:2, mortar flow 1 straight 180±10j
After mixing the mortar and adjusting the water so that it is 4X
A 4×16 specimen was molded into a mold and cured at 20° C. and 80% R and H. The bending strength and drying shrinkage tyr were measured. The respective results are shown in the χ$2 diagram and Figure 6.

In the figure, curve d1 is when 6 parts of sodium metasilicate is used as a hardening regulator, curve 2 is when 4 parts of sodium metasilicate and 2 parts of No. 6 sodium silicate are mixed and used, and curve 3 is when This is the case where 6 parts of sodium metasilicate was used, but no cement water reducing agent and urea were added.

As is clear from Figures 2 and 3, the bending strength can be improved by using a combination of sodium metasilicate and sodium silicate, or by adding a cement water reducer or urea, rather than using sodium metasilicate alone. It can be seen that the amount of drying shrinkage decreases.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the relationship between the amount of sodium metasilicate added and compressive strength, Figure 2 is a diagram showing the relationship between age and bending strength depending on the type of hardening regulator, etc., and Figure 6 is a diagram showing the relationship between age and drying shrinkage. A diagram showing the relationship between quantities. Patent Applicant: Denki Kagaku Kogyo Co., Ltd. Page 1 continued 0 Inventor: Katsu Akiyama Inside the Aomi Factory

Claims (1)

[Claims] An inorganic binder characterized in that 1 to 30 parts by weight of an alkali metasilicate or a substance containing an alkali metasilicate is added to 100 parts by weight of a fine powder having a latent hydraulic property of 2.000 cIL2/g or more.