JP2001261420A - Non-shrinkable mortal raw material containing blast furnace slag and having high fluidity, high strength and durability and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a non-shrinkable mortar raw material, in which the content ratio of inexpensive blast furnace slag to a binder and fine aggregate is increased as large as possible and which has high fluidity, high strength and durability and is suitable for a grout material, and to provide a manufacturing method thereof. SOLUTION: In the non-shrinkable mortal raw material consisting of 45-70 mass% binder and the balance the fine aggregate, the binder consists of blast furnace cement and an admixture, the blast cement contains 1-70 mass% granular blast furnace slag and the balance Portland cement clinker and the fine aggregate contain 50-75 mass% granular blast furnace slag.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a non-shrinkable mortar raw material containing blast furnace slag, having high fluidity, high strength and durability, and a method for producing the same.

[0002]

2. Description of the Related Art Conventional mortar raw materials are premised on the use of virgin raw materials such as Portland cement and silica sand as raw materials. Therefore, the performance is satisfactory but the price is high and uneconomical. Therefore, the method of using blast furnace slag widely used as civil engineering and building materials such as blast furnace cement and roadbed materials in mortar raw materials was studied. This blast furnace slag is generated in large quantities as a by-product when pig iron is produced in a blast furnace at an ironworks, and is mainly composed of oxides of Ca and Si. However, blast furnace cement containing blast furnace slag,
Due to the small particle size, it is difficult to perform in plastering work for construction, and there are difficulties such as large drying shrinkage and easy cracking. Therefore, it has been limited to use in fields used in large quantities in civil engineering work. Therefore, as described in JP-A-11-130505, a mortar material for grout, which is a grout composition for railroad tracks containing slag fine powder for slab tracks, and JP-A-11-21160. As described above, in order to suppress the time-dependent decrease in the strength of the hardened body of alumina cement, a super-rapid hardening non-shrinking mortar material for grout containing blast furnace slag having latent hydraulicity has been proposed.

[0003]

However, the mortar material for grout has the following problems to be solved. Slag fine powder used in grout mortar material is contained only in the binder to improve fluidity and prevent bleeding.Therefore, in mortar material for grout that makes full use of the characteristics and economy of blast furnace slag. Absent. Also,
The grout mortar material is not an economical grout mortar material because expensive additives such as a naphthalene sulfonate-based high-performance water reducing material, an organic shrinkage reducing material, and a material separation reducing material are required. And since the mortar material for grout requires expensive additives such as hydraulic inorganic binders such as alumina cement, and setting modifiers such as aluminum sulfates and lithium salts, the characteristics of blast furnace slag are still required. It is not an economical grout mortar material that is fully utilized. Therefore, the inventors have studied the characteristics of blast furnace slag and thought that it is necessary to provide a mortar raw material that can be used not only in the field of mass use in civil engineering work but also as a grout material. The present invention has been made in view of such circumstances, and is suitable for a grout material having an economical blast furnace slag content ratio of both binder and fine aggregate as much as possible, and having high fluidity, high strength and durability. An object of the present invention is to provide a non-shrinkable mortar raw material and a method for producing the same.

[0004]

According to the first aspect of the present invention, a non-shrinkable mortar raw material containing blast furnace slag and having high fluidity, high strength and durability according to the first invention is 45 to 70% by mass of a binder. And the remainder is a non-shrinkable mortar raw material composed of fine aggregate, and the binder is composed of a blast furnace cement and an admixture, and the blast furnace cement has a powdery blast furnace slag of 1 to 7
It contains 0% by mass and the balance is Portland cement clinker, and the fine aggregate contains 50 to 75% by mass of granular blast furnace slag. In this way, by manufacturing the blast furnace cement containing the powdered blast furnace slag in the binder, and the mortar raw material containing the granular blast furnace slag in the fine aggregate,
It is possible to manufacture a non-shrinkable mortar material that can obtain physical properties equivalent to those of a conventional non-shrinkable mortar material. The non-shrinkable mortar raw material containing the blast furnace slag according to the second invention according to the above object and having high fluidity, high strength, and durability,
A non-shrinkable mortar raw material comprising 45 to 70% by mass of a binder and the balance of fine aggregate, wherein the binder comprises blast furnace cement and an admixture of 8 to 12% by mass with respect to the blast furnace cement. Blast-furnace cement uses powdered blast-furnace slag from 1 to 70
Mass%, with the balance being Portland cement clinker, the fine aggregate being 50-75 mass% granular blast furnace slag
contains. In this way, the blast furnace cement containing the powdered blast furnace slag in the binder and the granular blast furnace slag in the fine aggregate are defined, and the optimum amount of admixture required for the quality of the mortar raw material is defined. By producing the mortar raw material thus prepared, a non-shrinkable mortar material capable of obtaining physical properties equivalent to those of a conventional non-shrinkable mortar material can be produced.

[0005] Here, in the non-shrinkable mortar raw material containing blast furnace slag according to the first and second inventions and having high fluidity, high strength and durability, the fine aggregate is 50 to 75 granular blast furnace slag. It is preferable that the content is contained by mass% and the balance is made of silica sand. In this way, by adding silica sand that is quality-controlled and dried, the shortfall in the particle size of blast furnace slag in the fine aggregate can be compensated for, and the absolute specific gravity and water absorption, which are the standard values for fine aggregate, are also added. It is possible to satisfy the rate, weight, and the like.
Moreover, in the non-shrinkable mortar raw material containing the blast furnace slag according to the first and second inventions and having high fluidity, high strength and durability, the surface of the granular blast furnace slag in the fine aggregate is ground. Is preferred. Here, grinding is to grind the blast-furnace slag with a breaker, and finely remove the fragile part of the surface of the blast-furnace slag, that is, a soft and highly water-absorbing jagged part. is there. This allows
The fragile portion on the surface of the granular blast furnace slag can be removed, and the granular blast furnace slag having a particle size satisfying the standard can be obtained.

In accordance with the above object, a method for producing a non-shrinkable mortar raw material containing blast furnace slag according to the present invention, which has high fluidity, high strength and durability, has a binder of 45 to 70% by mass, and the balance is fine. A method for producing a non-shrinkable mortar raw material comprising an aggregate, comprising:
In a mixture obtained by primary kneading of a blast furnace slag in a binder by 1 to 70% by mass and a balance of Portland cement clinker in a mixture obtained by primary kneading a mass% and a balance of silica sand with a mixing device, １２12% by mass of an admixture and secondary kneading with a mixing device to obtain a mortar raw material. Here, by increasing the kneading time (for example, about 5 to 30 minutes), granular blast furnace slag, silica sand, blast furnace cement, and the like can be distinguished between primary kneading and secondary kneading.
It is also possible to knead the admixture simultaneously. Thereby, the admixture which affects the quality of the mortar raw material can be uniformly dispersed in the fine aggregate. Here, in the method for producing a non-shrinkable mortar raw material containing blast furnace slag according to the present invention and having high fluidity, high strength and durability, the surface of the granular blast furnace slag in the fine aggregate is ground. Is preferred. This makes it possible to remove a fragile portion of the surface of the granular blast furnace slag, that is, a jagged portion that is soft and has a high water absorption, and to further contain a granular blast furnace slag having a particle size satisfying the standard. As described above, the present invention uses a blast furnace slag as both a binder and a fine aggregate, and further, if necessary, by combining an admixture having good compatibility with these, a mortar raw material that achieves the above object and It has been completed after finding that the manufacturing method can be obtained.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 shows a non-shrinkable mortar raw material (hereinafter simply referred to as a non-shrinkable mortar raw material) containing blast furnace slag and having high fluidity, high strength and durability according to the first embodiment of the present invention. FIG. 2 is a graph showing the relationship between the bleeding rate of the mortar material used and the ratio of the blast furnace slag in the fine aggregate. FIG. 2 is applied to the method for producing a non-shrinkable mortar raw material according to the first embodiment of the present invention. FIG. 3 is an explanatory view of a mortar raw material manufacturing apparatus to be used, FIG. 3 is an explanatory view of a grinding process of granular blast furnace slag used for a non-shrinkable mortar raw material according to a second embodiment of the present invention, and FIG. Fig. 5 is a graph showing the relationship between the fluidity of the mortar raw material and (amount of water used) / (amount of binder used), Fig. 5 is a graph showing the relationship between the expansion and contraction rate of the mortar material and the material age, and Fig. 6 is the mortar. Compressive strength of wood and (Amount of fine aggregate used) / (Use of binder) Is a graph showing the relationship between the amount).

The materials applied to the non-shrinkable mortar raw materials according to the first and second embodiments of the present invention will be described in detail below. Blast furnace slag is a vitreous slag obtained by quenching molten slag generated when pig iron is produced at an ironworks with water or air. Here, the powdery blast furnace slag contained in the blast furnace cement is an off-white dry fine powder (Brain value: 3300) produced by grinding. On the other hand, the granular blast furnace slag contained in the fine aggregate is a sandy aggregate having a maximum particle size of 5 mm. The quality of blast furnace slag is as follows.
The chemical component is mainly composed of oxides of Ca, Si and Al. The Blaine value (cm ² / g) is generally from 3480 to
It falls within the range of 4350. The binder is equivalent to the "paste" of the mortar raw material of the present invention, and is a mixture of cement and an admixture.

[0009] Fine aggregates are used in producing mortar raw materials.
It is equivalent to sand used for cement or the like as a binder and has a particle size of 5 mm under. The admixture is mainly composed of a binder, an anti-shrinkage agent, and a fluidizing agent. Among them, the binder is a special cement, and the anti-shrinkage agent is composed of expandable calcium oxide and calcium-sulfo-aluminate ettringite. The fluidizing agent is composed of a water-reducing high-strength admixture and a special lignin-based water reducing agent. Silica sand crushing mountain crushed stone, blended (compounded) in a constant particle size configuration, moreover that the sand was dried, SiO ₂ components 70
% Or more.

The non-shrinkable mortar raw material according to the first embodiment of the present invention is a non-shrinkable mortar raw material comprising 45 to 70% by mass of a binder and the balance being fine aggregate. here,
The binder is blast furnace cement and 8 to
The blast furnace cement contains 1 to 70% by mass of powdered blast furnace slag and the balance consists of Portland cement clinker, and the fine aggregate contains 50 to 75% by mass of granular blast furnace slag. The rest consists of quartz sand. Next, a mortar raw material manufacturing apparatus applied to the method for manufacturing a non-shrinkable mortar raw material according to the first embodiment of the present invention will be described.

[0011] As shown in FIG.
Numeral 0 denotes a flexible container 11 for charging the weighed granular blast furnace slag, silica sand and admixture, and a kneading mixer 12 which is an example of a mixing device.
And a hoist-type overhead crane 13 which is an example of a first transport unit that transports the overhead crane. Further, a storage weighing device 14 for storing and weighing the blast furnace cement, a screw conveyor 15 which is an example of a second transport means for transporting the weighed blast furnace cement to the kneading mixer 12, and a bag using the produced mortar raw material as a product And a filling unit 16 for filling.
The details will be described below. The flexible container 11
A collapsible cylindrical or square container 17 made of a flexible material such as a resin-treated cloth or a rubberized cloth;
7, a suspending portion 18 for lifting a container 17, an inlet 19 provided at the upper end of the container 17 for injecting a charge, and a discharge outlet provided at the lower end of the container 17 for discharging a charge. It is a container provided with an outlet 20. As a result, the weighed granular blast furnace slag, silica sand, and the admixture can be charged into the container 17 from the injection port 19, and the charge in the container 17 can be discharged from the discharge port 20 to the outside of the container 17.

The hoist type overhead traveling crane 13 is a hoist (winding) equipped with an I-shaped steel traveling rail 21 mounted below a ceiling beam of a building (not shown) and a trolley traveling along the traveling rail 21. Upper machine) 22 and hoist 22
And a hook 24 provided at an end of a wire rope 23 wound around a winding drum (not shown). The storage weighing device 14 is provided with a storage chamber 25 at an upper part and a weighing chamber 26 at a lower part, and is an integral type. In addition, screw conveyor 15
The upstream side of the screw conveyor 15 is charged into the weighing chamber 26, and the downstream side of the screw conveyor 15 is
2 above. This makes it possible to automatically transfer the blast furnace cement weighed in the weighing chamber 26 into the kneading mixer 12. At the lower end of the kneading mixer 12, a weighing machine 27 is provided as an integral type,
The mortar raw material thus manufactured can be weighed instantaneously. The mortar raw material weighed by the weighing machine 27 is provided with a guide portion 28 so that the mortar raw material can be loaded into a bag for loading the mortar raw material. The bag filling unit 16 is charged with a belt conveyor 30 that sequentially transports the bags 29 and a mortar raw material that is transported from the upstream side to the downstream side of the belt conveyor 30 so that the manufactured mortar raw material can be bagged. Sewing machine 31 for sewing the upper part of the bag 29
And

Subsequently, the mortar raw material manufacturing apparatus 1
A method for producing a mortar raw material using 0 will be described. First, 50 to 75% by mass of the granular blast furnace slag and the balance of silica sand are weighed and injected into the container 17 from the inlet 19 of the flexible container 11. Then, by operating the winding drum of the hoist 22 by a motor, the wire rope 23 is wound, and the flexible container 11 is lifted. Next, by moving the hoist 22 along the traveling rail 21 to above the kneading mixer 12, the winding drum is operated until the outlet 20 of the flexible container 11 is near the inlet 32 of the kneading mixer 12. The flexible container 11 is lowered. After lowering the flexible container 11, granular blast furnace slag and silica sand are put into the kneading mixer 12 from the outlet 20 of the flexible container 11. Here, the mixture (fine aggregate) is manufactured by operating the kneading mixer 12 and kneading (primary kneading) for about 1 to 3 minutes.

Also, with respect to the admixture of 8 to 12 mass% with respect to the blast furnace cement, after weighing, the admixture is conveyed to above the kneading mixer 12 by the same method as the above-mentioned conveying method, and the primary kneading is completed. Is added to the fine aggregate in the kneading mixer 12. At this time, the powdery blast furnace slag in the binder was
Blast furnace cement containing about 70% by mass and the balance being Portland cement clinker is also weighed in the weighing chamber 26 of the storage weighing device 14, and then conveyed by the screw conveyor 15 and added to the mixture in the kneading mixer 12. Here, the kneading mixer 12 is operated and kneaded (secondary kneading) for about 1 to 3 minutes to produce a mortar raw material that is dry-mixed. Next, this mortar raw material is weighed by a weighing machine 27, passes through a guide unit 28, and is sequentially charged into a bag 29 on a belt conveyor 30. The upper part of the bag 29 filled with the mortar raw material is perforated by the perforating device 31 to be a product.

As for the mortar material, water is added to the produced mortar material (for example, 36 to 4 with respect to the binder).
About 0% by mass). The quality of the manufactured mortar material was evaluated by each item of fluidity, breathability, non-shrinkage, and compressive strength. The above terms relating to quality are described in detail below. The fluidity is a term indicating the consistency (softness) of the kneaded mortar raw material, and the measured value is generally measured by a J-roth test. According to the Japan Highway Public Corporation Standard (JHS312-1992), 8 ± 2 seconds is adopted as a standard value of fluidity. Breathing property is a term that refers to the elution water that rises to the mortar material surface after the mortar material is cast (placed and driven).
Varies depending on the ratio of cement to fine aggregate. Typically,
Breathing tends to increase as fine aggregate increases. The measured breathing rate is JHS312-19.
The standard value is 2% or less 2 hours after the mortar material is cast.

Non-shrinkage (expansion and shrinkage) is a term related to expansion and shrinkage of the mortar material after casting. The expansion / shrinkage ratio, which is a generally measured value, is obtained by a JHS 312-1992 test. The Japan Highway Public Corporation Standards stipulate that no contraction occurs. Compressive strength is a term indicating the strength of a cured mortar material when compressed, and is defined by JHS312-199.
According to No. ² , 250 kgf / cm ² (24.
5N / mm ² ) or more, 450 kgf / cm in 28 days
² (44.1 N / mm ² ) or more. Although there is no specified value for durability in the Japan Highway Public Corporation Standard, it is judged from the standpoint of preventing penetration of rainwater and seawater after hardening of mortar material. Next, Table 1 shows the results of evaluating the mortar raw materials or mortar materials manufactured by the above-described method with respect to the above-described qualities.

[0017]

[Table 1]

Table 1 shows three types of blast furnace cements containing 1 to 70% by mass of powdered blast furnace slag and the balance being Portland cement clinker to test whether blast furnace cement can be used as a mortar raw material. A type, B type,
C is a result of comparing a comparative material using ordinary Portland cement. Here, the fine aggregate coarse particle ratio (FM value) indicates the state of the fine aggregate particle size.
This indicates that fine aggregate having this value was used. “OK” in the column of setting means that the produced mortar material starts to set in 1 hour or more (initial), and satisfies the respective standard values of setting within 10 hours (end). ing. In the column of evaluation of the manufactured mortar material, ◎ indicates that the quality and economic efficiency are particularly good (excellent), and
Means good (good) and Δ means slightly inferior but acceptable (possible) (the same applies to Tables 2 to 5). The test conditions were such that the mixing ratio of the binder and the fine aggregate was 1: 1 (the amount of cement in the mortar raw material and the amount of the admixture were 45.9% by mass and 4.1% by mass, respectively). The granulated blast furnace slag was a granulated blast furnace slag (hereinafter, referred to as a tangible blast furnace slag) in which molten slag was rapidly cooled.

Test No. Each evaluation value in the quality when using blast furnace cement class C containing powdered blast furnace slag of 70% by mass or less as shown in Fig. 1 and using fine aggregate having 50% by mass of tangible blast furnace slag Satisfies the reference value (standard value). On the other hand, when the utilization rate of the blast furnace slag was reduced, that is, blast furnace cement type A containing 30% by mass or less of powdered blast furnace slag was used, and fine aggregate having 50% by mass of a blast furnace slag was used. In each case, each evaluation value in the quality satisfies the reference value. As described above, when the content ratio of the powdery blast furnace slag in the blast furnace cement decreases, the content ratio of the Portland cement clinker increases.
It goes without saying that the reference value is satisfied even when the content becomes mass%.

That is, it can be seen that a non-shrinkable mortar raw material or mortar material having the same quality as the comparative material can be produced even when the powdery blast furnace slag in the blast furnace cement is 1 to 70% by mass. Therefore, the powdery blast furnace slag contained in the blast furnace cement was set to 1 to 70% by mass. However, in order to maintain more stable quality and in consideration of economy, the powdery blast furnace slag contained in the blast furnace cement was reduced. It is desirable that the content be more than 5% by mass and 60% by mass or less. Next, in order to improve the utilization rate of the blast furnace slag, the test No. 1 having a good evaluation in Table 1 was used. The blast-furnace slag in the fine aggregate is changed based on 2 (the ratio of granular blast-furnace slag / fine aggregate is 50-
75% range). Table 2 shows the results. Other conditions conform to Table 1. However, blast furnace cement shall be unified with Class B. In addition, the compression strength was compared with the strength of 3 days of age in order to accelerate the test results.

[0021]

[Table 2]

From Table 2, it was found that the reference value of the mortar raw material could be satisfied even when the proportion of the blast furnace slag in the fine aggregate was increased to 70% by mass. However, as shown in FIG. 1, when the percentage of the blast furnace slag in the fine aggregate is increased to 75% by mass, the mortar material slightly shrinks due to the influence of breathing. Also, the breathing rate of this mortar material is a borderline of the reference value of the mortar material, and the compressive strength of the material age 3 days is 250 kg of the reference value.
Compared to f / cm ² (24.5 N / mm ² ), there is no margin, and there is a limit to the further use of blast furnace slag with low material strength. Therefore, the blast furnace slag contained in the fine aggregate was set to 50 to 75% by mass, but in order to maintain more stable quality, the blast furnace slag contained in the blast furnace cement was reduced to 5% by mass.
It is desirable to set it to 0 to 70% by mass. When the proportion of the blast furnace slag is increased to 75% by mass, the breathing rate can be reduced by sieving the particle size of the blast furnace slag from 5 mm under to 2 mm under. Subsequently, in Table 2, Test No. 5 based on the ratio of the binder in the mortar raw material to the fine aggregate (the binder in the mortar raw material was changed from 45 to 50).
Mass%). Table 3 shows the results.

[0023]

[Table 3]

In Table 3, when the proportion of the binder in the mortar raw material decreases, the breathability tends to deteriorate,
When the proportion of the binder in the mortar raw material is reduced to 45% by mass, it is impossible to improve the breathability. on the other hand,
When the proportion of the binder in the mortar raw material increases, the amount of the binder (blast furnace cement) increases, so that the quality is improved and there is no problem. Therefore, the binder in the mortar raw material is set to 45% by mass or more, and is set to 70% by mass or less in consideration of economic efficiency. However, in consideration of economic efficiency, the binder in the mortar raw material is set to 45 to 50% by mass. It is desirable to do.

The breathability at this stage can be improved by ensuring that the top size of the particle size of the blast furnace slag is under 2 mm (enhancement of sieving). Where the particle size of the blast furnace slag is large, bubbles are large and water absorption is large, so that the amount of water used is large, and as a result, breathing tends to be large. Therefore, it is possible to reduce breathing by ensuring that the top size of the particle size of the blast furnace slag is under 2 mm. From Table 3, the content of the binder in the mortar raw material was 7%.
Although it is possible to make the mortar raw material up to 0% by mass, Test No. The amount of the admixture is changed based on 8 (range of 8 to 14% by mass with respect to the amount of blast furnace cement). Table 4 shows the results.

[0026]

[Table 4]

As shown in Table 4, the ratio of the admixture to the blast furnace cement was changed to 8.6 to 13.7% by mass. As a result, Test No. A limit value of quality assurance was obtained by setting the ratio of the admixture to about 10 (ie, the amount of the admixture to the blast furnace cement) to 8% by mass. On the other hand, Test No. In Test No. 12, Test No. 8 is much higher in non-shrinkage and strength, and the amount of the admixture is 12.0% by mass in consideration of economy.
Therefore, the ratio of the admixture to the blast furnace cement amount is 8 to 1
The content is set to 2% by mass. However, it is preferable to set the content to 9 to 11% by mass in order to maintain more stable quality and to consider economy.

The non-shrinkable mortar raw material according to the second embodiment of the present invention is the same as the non-shrinkable mortar raw material according to the first embodiment, except that the surface of the granular blast furnace slag in the fine aggregate is polished. This is a case where ore is used (hereinafter referred to as grinding blast furnace slag). Here, a method for producing a grinding blast furnace slag used for a non-shrinkable mortar raw material according to the second embodiment of the present invention will be described. FIG.
As shown in FIG.
The molten slag discharged from the blast furnace is cooled with water to obtain granular blast furnace slag, and then the dewatering tank 42 is used to remove moisture from the granular blast furnace slag to form a blast furnace slag. Then, after the metal component in the blast furnace slag is removed by a magnetic ore separator 43, the blast furnace slag is converted into a grinding blast furnace slag by a sandback mill 44 which is an example of a breaker. Further, after the grinding blast furnace slag is sieved to a required particle size by a classification device 45, a drying device 46 is used.
The surface of the grinding blast furnace slag wet when treated by the sandback mill 44 is dried. The details will be described below.

Conventionally, in a blowing machine 40, a molten slag generated when pig iron is produced at an ironworks is quenched by blowing it off with water to produce a blast furnace slag. The dried blast-furnace slag was manufactured by applying the blast-furnace slag to the dewatering tank 42. As the granular blast furnace slag in fine aggregate used for civil engineering, a blast furnace slag manufactured by the above method (conventional method) is sufficient. However, to develop more value-added applications,
It was necessary to enhance various physical properties of the blast furnace slag. Then, the material blast furnace slag is further subjected to a magnetic separation process by the magnetic force ore separator 43 to collect the metal component in the material blast furnace slag. Next, the brittle portion of the surface of the blast furnace slag is removed by a sandback mill 44 to obtain a blast furnace slag. In addition, the sand back mill 44 used here is a wet type fluidized bed apparatus, and the solvent in the apparatus,
For example, a device that causes the blast furnace slag to collide with each other by the flow of water generated by injecting water into the portion where the blast furnace slag is charged, and to refine the fragile portion on the surface of the blast furnace slag is there.

Further, in order to adjust the particle size of the blast furnace blast furnace slag, the blast furnace blast furnace slag was subjected to a classifier 45 to adjust the particle size to 5 mm under. Next, the moisture on the surface of the grinding blast furnace slag whose particle diameter was adjusted was removed by the drying device 46, and a dried grinding blast furnace slag having a particle diameter of 5 mm or less was manufactured. Here, in order to make the quality of the mortar raw material more stable, it is preferable to further apply the grinding blast furnace slag to the classification device 45 to make the maximum particle size of the grinding blast furnace slag 2 mm.

The method for producing a non-shrinkable mortar raw material according to the second embodiment of the present invention uses a grinding blast furnace slag instead of a physical blast furnace slag as a granular blast furnace slag in fine aggregate to be used. Other than that, the method is the same as the method for producing the non-shrinkable mortar raw material according to the first embodiment described above, and thus the description is omitted. Next, Table 5 shows the results of the quality test of the mortar raw material or the mortar material manufactured using the grinding blast furnace slag. The test conditions are the same as those in Table 4 except that a grinding blast furnace slag having a particle diameter of 2 mm or less was used as the granular blast furnace slag.

[0032]

[Table 5]

As granular blast furnace slag in fine aggregate,
Instead of furnace slag (Test No. 10), it was ground and treated.
By using grinding blast furnace slag (Test No. 13)
Mortar raw material or mortar material quality, ie breathing
Properties, non-shrinkage, and compressive strength
It was confirmed that it was good. As a result,
Variations in quality that occur when manufacturing mortar materials in large quantities
Made of mortar material that can guarantee the quality even if
Can be manufactured. In particular, the test No. 13 material decree
3 days compressive strength (σ_Three ) 320kgf / cm^Two (31.
4N / mm^Two ) Is the value of Test No. 10 days old 3 days pressure
Shrink strength 270kgf / cm^Two (26.5 N / mm^Two )of
50kgf / cm from the value^Two (4.9 N / mm ^Two ) Rise
You can see that it is. In other words, the content ratio of powdery blast furnace slag
High compressive strength, the compressive strength of 3 days of age (also referred to as initial strength)
Blast furnace cement class C, where
250kgf / cm^Two (24.5 N / mm^Two ) Make sure
It is a means to obtain the necessary strength value to maintain. Next,
Granulated blast furnace slag contained in aggregate, that is, blast furnace slag
Table 6 shows the measurement results of the particle size distribution of the blast furnace slag and the ore blast furnace slag.

[0034]

[Table 6]

As can be seen from Table 6, when the sieve mesh size is 0.6 mm or 0.3 mm, the passage rate of the particles of the blast furnace slag does not satisfy the standard of JIS A 5011. However, by mixing silica sand with the blast furnace slag, the passing rate of 0.6 mm and 0.3 mm in particle size was increased,
The particle size distribution can be adjusted. On the other hand, the grinding blast furnace slag meets the JIS A 5011 standard,
It is understood that the use of the grinding blast furnace slag as fine aggregate can contribute to the stability of the quality of the mortar material. next,
Table 7 shows the physical property values of the blast furnace slag used for the fine aggregate.

[0036]

[Table 7]

As shown in the test results in Table 6 above,
Grinding blast furnace slag in fine aggregate settles in a range where it can be used as aggregate in terms of particle size composition, but it must be combined with appropriate silica sand because it becomes fine sand from the fine aggregate coarse particle ratio. However, Table 7
As shown in Cases 1 to 3, the various physical property values do not satisfy the standards of JIS A 5011 even after the grinding processing. In particular, the fact that the water absorption of the grinding blast furnace slag exceeds 3.5% is one of the factors that increase the breathing rate as shown in FIG. For this reason, it is important to use a mixture with silica sand having a water absorption of 3% or less.

Through the above-mentioned tests, the present inventors have paid attention to the use of blast furnace slag from binder to fine aggregate, and have succeeded in economically producing a predetermined quality. In order to overcome the short-term strength shortage of blast furnace cement by combining it with an appropriate admixture, and to utilize blast furnace slag as fine blast furnace slag for fine aggregate, Ca (OH) generated from mortar in the early stage of hydration ₂ ) combined with the components of blast furnace slag,
After curing, we succeeded in producing a dense cured product. The cured body having good watertightness exhibits resistance to water infiltration containing dissolved components of each grain such as seawater, and can provide a durable mortar material. In addition, when the silica sand forming a part of the fine aggregate contains a small amount of one having alkali aggregate reactivity, it can be said that using a large amount of blast furnace slag is an effective means.

In the above-described embodiment, a method of manufacturing a grinding blast furnace slag using a sandback mill which is an example of a breaker at the time of manufacturing a grinding blast furnace slag has been described. Since it is only necessary to remove the vulnerable part, a dry-type apparatus can be used in consideration of workability and the like. In the above embodiment, the first
Although the case of using a hoist type overhead crane as an example of the transport means is shown, since it is sufficient that the raw material can be transported to the kneading mixer, it is also possible to use a club type overhead crane or the like depending on the amount of mortar raw material to be manufactured. is there.
Further, the traveling rail can be a double rail. Furthermore, it is also possible to install a storage container and a weighing machine for each of the blast furnace cement, silica sand, admixture, and granular blast furnace slag without using a conveying means, and to automatically charge the kneading mixer.

[0040]

EXAMPLES The results of tests of a mortar raw material or a mortar material manufactured by applying the method of manufacturing a non-shrinkable mortar raw material according to the present invention will be described. In FIG. 4, the fluidity range of the Japan Highway Public Corporation is in the range of 6 to 10 seconds, and there is no problem such as material separation (water usage W) / (binder usage C + SL).
The area where the ratio is 40% or less is shown. Further, the area of the test result of the material of the present invention is indicated by hatching. When the (fine aggregate S) / (binder C + SL) ratio is 1.0, the material of the present invention passes 100% of the standards of the Japan Highway Public Corporation. When granular blast furnace slag is used as fine aggregate as in the material of the present invention, W / (C +
Although the (SL) ratio increases by 1 to 2%, the problem of material separation or the like does not occur because S / (C + SL) is smaller than 1.5 as compared with the case where natural sand (crushed stone) is used. Furthermore,
In the material of the present invention, when S / (C + SL) = 1.2 or less, the W / (C + SL) ratio was 40% or less, and it was found that a good mortar was obtained. Here, S is the amount of fine aggregate used, C is the amount of cement used, SL is the amount of admixture used, and W is the amount of water used.

FIG. 5 shows a case where ordinary Portland cement is used as a binder (shaded portion) and a case where blast furnace cement B containing powdery blast furnace slag which is a material of the present invention is used as a binder (dotted portion). FIG. 3 is a view showing expansion and contraction rates of respective mortar materials. It should be noted that the specification of the expansion / shrinkage ratio is such that shrinkage must not occur in the material age of 7 days. Test No. Although the expansion and contraction rate was 0.08 in Example 10, it can be improved to 0.50 (see Test No. 13) by grinding the granular blast furnace slag. As a result, even when the blast furnace cement class C is used, it can be settled within the above-mentioned specification range. In addition, the effect of the grinding treatment of the granular blast furnace slag leads to a reduction in the bleeding of the mortar material, and as a result, it can be directly linked to an improvement in the expansion and shrinkage rate of the mortar material.

FIG. 6 shows the lower limit value (σ ₃ ≧ 250 kgf / cm ² (24.5 N /) of the compressive strength (σ ₃ , σ ₂₈ , respectively) of 3 days and 28 days of age. m
m ² ), σ ₂₈ ≧ 450 kgf / cm ² (44.1 N / m
m ² )). At compressive strength of 3 days of material age,
When a mortar material using a granular blast furnace slag having a particle size of 5 mm or less, that is, a mortar material using a physical blast furnace slag without grinding processing, a case where the compressive strength does not satisfy the lower limit value occurs (● mark: 200 to 250 kgf). / Cm ² (19.6 ~
24.5 N / mm ² )). However, it is possible to satisfy the lower limit by adjusting the particle size of the blast furnace slag to 2 mm under (the mark: 270 kgf / cm ^2).
(26.5 N / mm ² )). Here, the grinding blast furnace slag in which the surface of the blast furnace slag was ground and treated was further used, and the particle size was adjusted to be under 2 mm (x mark: 32).
0 kgf / cm ² (31.4 N / mm ² )), and the compressive strength exceeded the lower limit specified by the Japan Highway Public Corporation, and it was found that mortar materials with more stable quality could be manufactured. When the cement used is blast furnace slag type C, the initial strength is slightly reduced, but the particle size of the granular blast furnace slag used as fine aggregate is adjusted to 2 mm under, or the grinding blast furnace slag is used. 250 kgf / cm ² (24.5
N / mm ² ) can be satisfied (from the relationship with Test No. 1).

As described above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the configurations described in the above embodiments, but is described in the claims. Other embodiments and modifications that can be considered within the scope of the matter are also included. For example, fine aggregate was shown in the case of granular blast furnace slag and the remainder made of silica sand,
The physical properties of fine aggregates, ie, absolute dry specific gravity, water absorption, capacity, etc.
Since it suffices to satisfy the standard of IS A 5011, for example, sand, gravel, crushed sand, crushed stone, and other similar materials can be contained as fine aggregate instead of silica sand.

[0044]

According to the first aspect and the third aspect dependent thereon,
In the non-shrinkable mortar raw material described in 4, the conventional non-shrinkable mortar raw material is manufactured by producing blast furnace cement containing powdered blast furnace slag as a binder and mortar raw material containing granular blast furnace slag as fine aggregate. A non-shrinkable mortar material capable of obtaining the same physical property values as the non-shrinkable mortar material can be manufactured. Therefore, it is possible to produce a non-shrinkable mortar raw material containing economical blast furnace slag and having high fluidity, high strength and durability, so that blast furnace slag can be used not only in the field of being used in large quantities in civil engineering work, It can also be used as a grout material for construction. This makes it possible to minimize lithotripsy caused by cutting from a mountain, which is likely to cause conventional natural destruction. In the non-shrinkable mortar raw material according to claim 2 and dependent claims 3 and 4, the blast furnace cement containing the powdery blast furnace slag as the binder and the granular blast furnace slag as the fine aggregate are contained. In addition, by producing a mortar raw material that defines the optimal amount of admixture required for the quality of the mortar raw material, it is possible to obtain physical properties equivalent to those of the conventional non-shrinkable mortar material. Materials can be manufactured. Therefore, the present invention is to provide a non-shrinkable mortar raw material which is liable to cause conventional natural destruction, and which minimizes crushing by cutting from a mountain and which is economical and has a wide range of use regardless of the fields of construction and civil engineering. Becomes possible.

In particular, in the non-shrinkable mortar raw material according to the third aspect, the shortage of the particle size of the blast furnace slag in the fine aggregate can be compensated for by adding silica sand in a quality-controlled and dry state. Absolute dry specific gravity, which is the standard value for fine aggregate,
It is possible to satisfy the water absorption, the weight, and the like. Therefore,
It is possible to provide a non-shrinkable mortar raw material having a stable quality that compensates for defects in properties and quality of blast furnace slag as a by-product. In the non-shrinkable mortar raw material according to claim 4,
The fragile part of the surface of the granular blast furnace slag, that is, soft,
In addition, jagged portions having high water absorption can be removed, and a granular blast furnace slag having a particle size satisfying the standard value can be obtained. Therefore, by using this granular blast furnace slag as fine aggregate, a non-shrinkable mortar raw material having more stable quality can be provided.

In the method for producing a non-shrinkable mortar raw material according to the fifth and sixth aspects, the admixture which affects the quality of the mortar raw material can be uniformly dispersed in the fine aggregate. Therefore, the non-shrinkable mortar can be used not only in the field of mass use in civil engineering work but also as a grout material for construction and contains economical blast furnace slag and has high fluidity, high strength and durability. Raw materials can be manufactured. In particular, in the method for producing a non-shrinkable mortar raw material according to claim 6, the fragile portion of the surface of the granular blast furnace slag, that is,
It can remove jagged parts that are soft and have high water absorption,
Furthermore, it becomes possible to contain granular blast furnace slag having a particle size satisfying the standard value. Therefore, a non-shrinkable mortar raw material having more stable quality can be manufactured.

[Brief description of the drawings]

FIG. 1 is a graph showing a relationship between a breathing rate of a mortar material manufactured using a non-shrinkable mortar raw material according to a first embodiment of the present invention and a ratio of blast furnace slag in fine aggregate.

FIG. 2 is an explanatory diagram of a mortar raw material manufacturing apparatus applied to a method of manufacturing a non-shrinkable mortar raw material according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of a grinding process of a granular blast furnace slag used for a non-shrinkable mortar raw material according to a second embodiment of the present invention.

FIG. 4 Fluidity of non-shrinkable mortar raw material and (water usage)
6 is a graph showing a relationship with / (amount of binder used).

FIG. 5 is a graph showing the relationship between the expansion / shrinkage rate of the mortar material and the material age.

FIG. 6: Compressive strength of mortar and (use of fine aggregate) /
6 is a graph showing a relationship with (amount of binder used).

[Explanation of symbols]

10: mortar raw material production apparatus, 11: flexible container, 12: kneading mixer, 13: hoist type overhead crane, 14: storage weighing apparatus, 15: screw conveyor, 16: bagging section, 17: container, 18: hanging section, 19:
Inlet, 20: outlet, 21: running rail, 22: hoist, 23: wire rope, 24: hook, 25: storage room, 26: weighing room, 27: weighing machine, 28: guide unit, 2
9: bag, 30: belt conveyor, 31: sewing machine, 32: inlet, 40: blowing machine, 41: blast furnace, 4
2: dehydration tank, 43: magnetic separator, 44: sandback mill, 45: classification device, 46: drying device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masato Kajiyama 9-27 Kawabata-cho, Yahata-Higashi-ku, Kitakyushu-shi, Fukuoka Prefecture Inside Taihei Kogyo Co., Ltd.Yawata Branch (72) Inventor Koji Oba 9-27 Taihei Kogyo Co., Ltd., Yawata Branch (72) Inventor Masayoshi Yokoo 1-1, Tobata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka New Nippon Steel Corporation Yawata Works (72) Inventor Ikuo Fujii Kitakyushu, Fukuoka Prefecture No. 1-1 Hibata-cho, Tobata-ku, Ichiba New Nippon Steel Corporation Yawata Works (72) Inventor: Mikitomo Ikeda F-term in ES-L-Tech Co., Ltd. 4G012 PA02 PA29 PC11 PC12 PC14

Claims (6)

[Claims] 1. A non-shrinkable mortar raw material comprising 45 to 70% by mass of a binder and a balance of fine aggregate, wherein the binder comprises a blast furnace cement and an admixture, and the blast furnace cement comprises: A powdery blast furnace slag containing 1 to 70% by mass and a balance of Portland cement clinker, wherein the fine aggregate contains a granulated blast furnace slag of 50 to 75% by mass; A non-shrinkable mortar raw material having high strength and durability. 2. A non-shrinkable mortar raw material comprising 45 to 70% by mass of a binder and a balance of fine aggregate, wherein the binder is 8 to 12% by mass based on the blast furnace cement and the blast furnace cement. Consisting of an admixture, and the blast furnace cement,
A powdery blast furnace slag containing 1 to 70% by mass and a balance of Portland cement clinker, wherein the fine aggregate contains a granulated blast furnace slag of 50 to 75% by mass; A non-shrinkable mortar raw material having high strength and durability. 3. The non-shrinkable mortar raw material containing blast furnace slag according to claim 1 and having high fluidity, high strength and durability, wherein the fine aggregate comprises 50 to 75 mass of the granular blast furnace slag. % Blast furnace slag containing blast furnace slag characterized by the fact that the balance consists of silica sand, and has high fluidity, high strength and durability. 4. A non-shrinkable mortar raw material containing the blast furnace slag according to any one of claims 1 to 3, which has high fluidity, high strength and durability, wherein the granular blast furnace in the fine aggregate is provided. A non-shrinkable mortar raw material containing blast furnace slag, characterized in that the surface of the slag is polished, and having high fluidity, high strength and durability. 5. A method for producing a non-shrinkable mortar raw material comprising 45 to 70% by mass of a binder and a balance of fine aggregate, wherein 50 to 75% by mass of a granular blast furnace slag in the fine aggregate and a balance A blast furnace cement containing 1 to 70% by mass of powdery blast furnace slag in the binder and a balance of Portland cement clinker in a mixture obtained by primary kneading silica sand with a mixing device, and 8 to 12 parts by mass of the blast furnace cement A mortar raw material containing a blast furnace slag, characterized by adding a mass% of an admixture and secondary kneading with the mixing device to obtain a mortar raw material having high fluidity, high strength and durability. Manufacturing method. 6. The method for producing a non-shrinkable mortar raw material containing blast furnace slag according to claim 5 and having high fluidity, high strength and durability, wherein the surface of the granular blast furnace slag in the fine aggregate is polished. A method for producing a non-shrinkable mortar raw material containing blast furnace slag, characterized by being ore, having high fluidity, high strength and durability.