JPS6054256B2 - hydraulic composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic material in which slag by-produced from a steelmaking blast furnace can be effectively utilized.

A portion of the slag discharged from the blast furnace is quenched with water and used as wood frame slag, which is used as a raw material for blast furnace cement and other purposes.

The amount of slag used is extremely small compared to the total amount of discharged slag. On the other hand, devices for removing sulfur from flue gases are installed in various places to prevent pollution, but there is a demand for effective use of the gypsum produced by such devices. From the standpoint of mass utilization and multi-purpose use of such wooden frame slag and gypsum, research is underway into a non-fired mixed cement consisting of slag and slaked lime.

However, with regard to the wooden frame slag-gypsum slaked lime diameter cement, the strength of the hardened product increases to 300 in 28 days by 9/cl.
Although it reaches more than t, it changes sharply depending on the amount of slaked lime added, so the amount added must be strictly controlled in practical use. It has also been proposed to provide early-strength seawater-resistant cement compositions by blending special clinkers, inorganic sulfates, and slags in specific proportions.

(Refer to Japanese Unexamined Patent Publication No. 139133/1983) This composition has a content of special clinker and inorganic sulfate of 503/
A]. Although the 0.03 molar ratio is specified as 0.7 to 2.4, this means that a large amount of expensive special clinker is used, resulting in an expensive product.

The present invention has been made in consideration of the above points, and it is possible to reduce the amount of relatively expensive special clinker used, to be economical, and to achieve a large and stable increase in long-term strength compared to initial strength. A hydraulic composition is provided.

The present invention consists of 40 to 95% blast furnace water slag, 5% inorganic sulfate,
This is a hydraulic composition characterized by containing 0.5 to 10% clinker, such as jet cement, which predominantly contains calcium haloaluminate to a composition consisting of 60% to 60% clinker. The clinker containing calcium haloaluminate used in the present invention is a special linker that exhibits extremely rapid strength development when made into cement.

The speed of strength development is, for example, 2 hours after pouring concrete.
It is so strong that it can be removed from the formwork within 3 hours, and its chemical and mineral compositions are compared with other typical cements as shown in Tables 1 and 2. In the table, this cement is designated as A cement. In addition, in the composition of the present invention described above, a more preferable range is granulated blast furnace slag 60~
90%, inorganic sulfate 10~40%, special clinker 2~
It is 6%.

As is clear from the table above, the clinker used in the present invention has a higher amount of calcium aluminate than other cements.
It is characterized by a correspondingly increased amount of calcium sulfate, which is present in the form of calcium haloaluminate rather than in the form of calcium aluminate found in normal Bortland cement clinker. There are things.

Is this cement rice? Regulated Set Cement developed at CA Research Institute
tCement), and is sold domestically under the trademark Jet Cement. The present invention
Such a special? By mixing a linker with granulated blast furnace slag and inorganic sulfate, hydraulic properties are developed, and the long-term strength increases significantly compared to the initial strength.
In addition, products of stable quality can be obtained, and in particular, the appropriate blending ratio of granulated blast furnace slag and inorganic sulfate is 0.5 to 10% as shown below. I found it.

According to this blending ratio, when calculating assuming that gypsum dihydrate is used as the inorganic sulfate, SO3/Al2O3 half 4
~550. Regarding mortar bending strength, when the amount of special linker added is about 2 to 4%, 20%
It was found that the same level of peak was observed when the above amount was added, and it was found that sufficient practical strength was reached in the range of 0.5 to 10%. As the inorganic sulfate, calcium sulfate, sodium sulfate, potassium sulfate, etc. can be used, and calcium sulfate is particularly preferred.

As calcium sulfate, dihydrate gypsum, which has recently been produced in large amounts as a by-product, is preferred from the viewpoint of availability, but hemihydrate gypsum and anhydrous gypsum can also be used. Of course, there is also a relationship between the blended amounts of granulated blast furnace slag, inorganic sulfate, and this special linker, and this will be clarified by the Examples described later.

In addition to being used as a normal hydraulic material, the hydraulic composition of the present invention may be particularly useful for producing noncombustible materials by mixing asbestos or organic fibers. Next, Examples and test results will be explained. Example SlO2 34.75%, Al2O3l3. Seki%, FeO
O. 7O%, Mn2O3O. 64%, CaO42. O8
%, MgO5.83%, TlO2l. 46%, SO. 9
It has a chemical composition of 4% and has a fineness of 150c7.
1! /f granulated blast furnace slag and fineness 5 in Table 1 above
, 620cI1/f A cement (trade name: Jet Cement, manufactured by Odano Cement Co., Ltd.) and fineness of 2,%1.
A hydraulic composition was prepared using the 1/y reagent dihydrate gypsum in the proportions shown in Table 3 below.

In addition, NO. 1-5 are for comparison. Looking at the test results, the mortar flow results are shown in Figure 1. In the figure, 0, Δ, ◎, A, and A indicate that the amount of jet cement added is 0%, 2%, 4%, and 6, respectively. %,
8% and 10%, and as is clear from the figure, as the amount of jet cement added increases, the mortar flow gradually decreases, and when the amount of jet cement added is constant, the mixing ratio of There was a tendency for mortar flow to increase as the value increased.

In addition, the mortar bending strength is shown in Figure 2 a to f, and A, b, c, d, e, and f are for the amount of added jet cement of 0%, 2%, 4%, 6%, respectively. These are the results for cases of 8% and 10%.

The compressive strength is shown in Figure 3 a-f, A, b, c,
d, e, each have a mixing ratio of granulated blast furnace slag and gypsum of 9.
0110,80120,70130,60140,50
150; and f is the result for mortar. When the amount of jet cement added is small and the mixing ratio of gypsum is about 20%, it shows a large strength development, but when the amount of jet cement added is large, the smaller the mixing ratio of gypsum, the greater the strength development. There is. When the mixing ratio of granulated blast furnace slag and gypsum is constant, the initial strength increases as the amount of jet cement added increases, but in the long term, when the amount of jet cement added is 2 to 4%, the initial strength increases. Shows strength development.

[Brief explanation of the drawing]

Figure 1 is a graph showing mortar measurement results, Figure 2 a-f
3 is a graph showing the test results of bending strength, and FIGS. 3a to 3f are graphs showing the test results of compressive strength.

Claims (1)

[Claims] 1. Granulated blast furnace slag 40-95%, inorganic sulfate 5-60%
% clinker containing predominantly calcium haloaluminate such as jet cement in a composition of 0.5%
A hydraulic composition characterized by containing 10% to 10%. 2. Claim 1 that the inorganic sulfate is dihydrate gypsum
Hydraulic composition as described in .