JPH04198049A - Water-permeable composition - Google Patents

Abstract

PURPOSE:To obtain a water-permeable composition excellent in water permeability and strength by blending an annealed coarse granular product, etc., with granulated slag fine powder so as to provide a grain size curve of the resultant aggregate composed of the coarse granular product, etc., and the granulated stag fine powder within a specific range and, as necessary, adding an alkali stimulating material to the blend. CONSTITUTION:At least one of a coarse granular product such as annealed slag having 25-5mm grain size, an intermediate granular product such as limestone having 5-0mm grain size and a fine granular product such as granulated slag having 2.5-0mm grain size is blended with 1-14wt.% granulated slag fine powder so as to provide a grain size curve of the resultant aggregate within the range (X) of the figure. An alkali stimulating material (e.g. cement or gypsum) in an amount of 1-14wt.%, as necessary, is blended.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a water-permeable composition for forming roads, plazas, parking lots, indoor and outdoor floor surfaces, railway subgrades, yards, etc.

[Conventional technology]

In recent years, water-permeable paving materials have attracted attention from the viewpoint of environmental protection, etc., and various paving materials are known.

On the other hand, hydraulic slag produced as a by-product in blast furnaces, that is, slowly cooled slag, granulated slag, or granulated granulated slag powder, is used for night-time use, and its application as a water-permeable paving material is also known.

For example, JP-A-62-86 cited as a first precedent example.
In Publication No. 203, aluminum sulfide or its salt, or aluminum sulfate is added to blast furnace slag in an amount of 10 to 20% by weight (hereinafter % refers to % by weight unless otherwise specified). It is disclosed that the roadbed is leveled to form a roadbed, and an aqueous solution of magnesium fluorosilicate is sprinkled or applied thereon.

In addition, as a second precedent example, Japanese Patent Application Laid-open No. 63-2232
In Publication No. 03, 20 to 30 parts by weight of sodium chloride, 20 to 30 parts by weight of magnesium chloride, 35 to 45 parts of potassium chloride, and 5 to 15 parts of calcium chloride are added to blast furnace slag.
It is taught that an additive consisting of 1 part and 4 to 8 parts of citric acid is added, for example, 1 kg to granulated slag lrn' and spread out.

[Problem to be solved by the invention]

However, the roadbed obtained by the first prior example does not have sufficient water permeability and strength, as is clear from the examples.

Further, in the second prior example, although the strength is unknown, at least the water permeability coefficient of the resulting pavement material is common and not high. Moreover, the material cost of the additive is quite high.

Therefore, an object of the present invention is to provide a water-permeable composition with excellent water permeability and strength, and to reduce material costs.

[Means to solve the problem]

The above problem is caused by the particle size of air-cooled slag, which is produced as a by-product in blast furnaces.
Particle size of 5-5M coarse grain products, limestone etc. 5-0IIlf
Aggregate consisting of at least one of medium grain products, fine grain products such as granulated slag with a particle size of 2.5 to 0 mm, and 1 to 14% by weight of granulated slag fine powder; The problem can be solved by making the particle size curve of the aggregate mainly composed of an alkali stimulating material and falling within the range X shown in FIG.

Further, in this case, the alkaline stimulating material can be selected from cement or stone bone.

[Effect]

As detailed below, it exhibits excellent water permeability and strength due to the functions of each component and their mutual relationships.

[Specific structure of the invention]

The present invention will be specifically explained in more detail below.

In the present invention, the particle size curve of the aggregate is within the range X in FIG.
It is said to be within. The grain size curve of the aggregate is the line Lf in Figure 1.
If it deviates from this, the particle size of the composition will be fine and the water permeability will be poor. On the other hand, if it deviates from the line Lr, there are problems such as coarse grain size and inferior strength.

Aggregates used in the present invention include coarse particles with a particle size of 25 to 5 mm, such as slow-cooled slag produced as a by-product in blast furnaces, and coarse particles with a particle size of 5 to 5 mm, such as limestone.
It consists of at least one of a medium grain product of OM, a fine grain product with a particle size of 2.5 to 0 width such as granulated slag, and 1 to 14% by weight of fine powder of granulated slag.

The coarse grain product, medium grain product and fine grain product contain 98% in the composition.
Contained below. If the aggregate content exceeds 98%, sufficient strength cannot be obtained.

Hydraulic slags such as slow-cooled slag, granulated slag, and fine granulated slag powder exhibit high long-term strength and latent hydraulic properties due to the interlocking of their surface shapes.
This results in a reduction in the amount of alkaline stimulating materials used such as cement, stones, and gauges. Furthermore, hydraulic slag exhibits excellent water permeability due to its inherent air bubbles. On the other hand, it is desirable to use water-washed slowly cooled slag, granulated slag, and limestone in order to increase the porosity and improve water permeability.

Furthermore, if the particle size is the same, crushed stone for ready-mixed concrete is considered a coarse-grained product, and water-washed slowly cooled slag is considered a medium-grained product.
A washed product of No. 7 crushed stone or natural coarse sand can be substituted as a fine grain product, and a washed product of natural fine sand or a washed product of crushed stone sand can be substituted, respectively. However, if they are substituted, the hydraulic reaction effect will be inferior, so the amount of alkaline stimulant such as cement will increase, and water permeability will tend to decrease. In addition, replacing limestone with water-washed slowly cooled slag is actually a good idea because it further improves hydraulic properties.

In this way, in order to obtain the desired strength, the amount of alkaline stimulant such as cement will be increased, since hydraulic reaction cannot be expected, and this will reduce water permeability. It is important to decide what to substitute and, if so, how much.

As the alkali stimulating material, cement, stone, etc. can be used, and these can also be used in combination. The amount of alkaline stimulant used is 1 to 14%. Although the amount used is within a small range, it is used to select the strength depending on the purpose of use and to increase the porosity to ensure excellent water permeability. If the alkali stimulant content is less than 1%, the strength will not be sufficient.

Further, as the alkali stimulating material, converter slag or slaked lime can be used. When using converter slag, if a large amount is used, the composition will turn black and an expansion reaction will be observed, which may cause damage when constructing paving slabs, so the amount used should be around 1 to 4%. It is hoped that

Slaked lime can be used as a substitute for gypsum, but it can be applied to the subgrade, although its strength is inferior. The amount of slaked lime used is preferably about 4 to 10%.

By adjusting the amount of this alkaline stimulant and the amount of water,
Both non-flowable and flowable mixtures can be prepared. When using cement, 4% or less of gypsum can be used in order to improve the initial strength even in the case of forming a fluid mixture.

Granulated slag powder as hydraulic slag functions as a fine aggregate or filler, and also as a cement substitute and has the function of further increasing hydraulic properties. Can be used. Furthermore, the granulated slag powder increases the hydration reaction time and the pot life of the mixture. The content of the granulated slag powder is 1 to 14%. If it is less than 1%, the function of the filler is insufficient. On the other hand, if it exceeds 14%, problems such as a decrease in water permeability will occur.

Further, in view of the above, the total amount of the alkaline stimulating material and the fine water granulated slag powder is desirably 2 to 15% by weight.

The amount of water added is preferably 5 to 30%.

The water permeable composition obtained by the present invention is lightweight and exhibits excellent water permeability and strength when the non-flowable mixture is used as a paving material. When used as a paving material, it can be used as a material for the upper or lower layer of a water-permeable roadbed, as a water-permeable low-strength surface pavement version, as a water-permeable normal-strength pavement version, etc. The fluid mixture can also be used as a material for molded products that require water permeability, such as U-shaped grooves and water collection basins.

〔Example〕

Examples will be shown below to clarify the effects of the present invention.

(Example 1) Slowly cooled slag having the particle size shown in Table 1 (25-5Ill
I11), limestone (5 to 0), granulated slag (2,5 to 0)
0■), 7g fine water crushed powder (4000Ci/g)
Using this method, various mixed aggregates were obtained as shown in Table 2.

Table 1 Table 2 (weight%) (Note) * is within the scope of the present invention.

Regarding the mixed synthetic aggregates of these formulations (1) to (17),
When particle size curves were drawn, the results shown in FIGS. 2 to 6 were obtained. In each figure (the same goes for Figures 7 to 10), mixed synthetic aggregates with a particle size curve within the range X have preferred particle sizes, and as they deviate from the line Lf, the particle size becomes finer, 'a, If it deviates from Lr, the particle size becomes coarse and it becomes difficult to obtain the desired physical properties.

Note that the steeper the slope of the particle size curve, the better the water permeability.

Referring to these figures 2 to 6, formulations (5) to (
10) is found to be within range X. Also, combination (1)
- (4), (12) - (17) are off the line Lf and are too fine, and blend (11) is off the line Lr and too coarse.

(Example 2) Next, cement or 6 strokes of an alkaline stimulant were added to each of the above mixed synthetic aggregates, and the hydraulic conductivity and unconfined compressive strength after 28 days were examined.

Table 3 shows the blending ratios and results based on the weight of the composition of the present invention as 100%.

Regarding each of the formulations (1) to (17) exhibiting such physical properties, the quality was evaluated considering the intended use. The results are shown in Table 4.

The physical properties and the criteria for applicability to each application are as follows: water permeability coefficient of I x 10-2 an/see or more, compressive strength of 10 kgf/a! (Wood age: 10 days) or more was rated as good (◯).

On the other hand, from the results in Tables 3 and 4, we can see that permeable roadbed, permeable low-strength surface pavement version (water permeability coefficient is lX1O-2~1x
1O-3CIn/SeC is preferred), the amount of alkaline stimulant added is about 1 to 4%, and water permeability normal strength surface pavement version (water permeability coefficient is l x l0-2 to I x l
O-'an/see is preferable), the amount of alkaline stimulant (excluding stone bones) added is about 5 to 14%.
In addition, as a fluid composition, a water permeable structure (water permeability coefficient is I
It was presumed that it is desirable to use the same addition amount also when used in the case where X 10-'' to 10' an/see is preferable).

Stone bones can be used as an alkaline stimulant when applied to a permeable sub-base course, and the amount added can be 1 to 14%. Stone bone can be suitably used with an upper limit of 4% to improve the initial strength. Also, increasing the amount of cement causes a slight decrease in water permeability.

(Example 3) In the present invention, when synthesizing aggregate, there are embodiments in which two types, three types, and four types are mixed. Further, in Example 1, the amount of the granulated slag powder added was in the range of 1 to 6%.

Therefore, Table 5 shows examples of formulations obtained by examining various aggregate formulations under the condition that the amount of granulated slag fine powder was within the range of 1 to 14%. Range X was determined from this result.

Among these formulation examples, for the formulations marked with ☆ in Table 5, particle size curves were actually drawn and the results were as shown in FIGS. 7 to 10. In addition, the actual mixture marked with ☆ is the 6th one.
Shown in the table.

(Note) * is within the scope of the present invention.

(Example 4) Formulations (8) and (10) shown in Table 7, which have excellent water permeability and strength, were used as roadbed materials for the lower part of railroad tracks.

For kneading, a tilting mixer (capacity 1.5 rn'/1 batch) of a ready-mixed concrete plant was used. The mixed roadbed material was transported by dump truck and loaded with a 3t bulldozer.
8 was rolled using a vibrating roller, and finished using a 15t tire roller. The constructed roadbed has a width of 4.5 m, a thickness of 0.2 m, and a length of 60 m.

On the other hand, in order to investigate the hydraulic conductivity and strength, the mixture was collected at the time of loading into a dump truck after mixing in the plant, and a specimen (
φ1 oan x 20 an) was prepared and stored under standard curing.

Furthermore, the site roadbed was under curing in a natural atmosphere, and specimens for investigation were collected by core polling.

The results are shown in Table 8.

The product obtained by paving the mixture obtained by kneading is 20
It is a lightweight mixture of less than 00 kg/m'. Ordinary ready-mixed concrete was lightweight compared to 2300 to 2400 kg/rrl.

0.0% of the mixture obtained by kneading. Regarding M, C and dry density, 0, M, C of formulation (8) obtained in laboratory tests.
It was about 11.0% compared to 9.3%.

Dry density is 1.77 g for 1.78 g lcd
/ad was obtained.

0 of the formulation (lO). M and C are 6.0% compared to 6.4%
It was about. Moreover, the dry density was 1.81 g/ruf compared to 179 g/car.

Regarding water permeability, the desired water permeability coefficient is 1.0X10-'
〜1.0X10-3an/sec, the formulation (8) under standard curing is LOX 1O-2an/sec
, the formulation (10) is 1.18 X 10- 'an/se
c. Under on-site curing, formulation (8) was 7. I Xl0-2an
/sec, composition (lO): 1. , 28 x 10”a
The value of n/sec was obtained.

The permeability coefficient under on-site curing is the value after being applied to the upper facility.

In unconfined compressive strength, desired 3-day strength 10kgf/
ci or more is 13 under standard curing, as shown in Table 8.
0~23.5kgf/ad, under on-site curing, 10'
, 0-16. Cleared both Okgf/al.

[Effects of the Invention] As described above, according to the present invention, a water permeable composition having excellent water permeability and strength can be obtained using inexpensive materials.

[Brief explanation of the drawing]

Figure 1 shows the aggregate particle size range of the present invention.
Figure 0 is a curve diagram of particle size according to each formulation example. Patent applicant: Sumitomo Metal Industries, Ltd. Sumikin Kashima Minerals Co., Ltd. Procedural amendment (voluntary) June 5, 1991 Director General of the Patent Office Toshi Uematsu 2, Title of invention: Water-permeable composition 3, Person making the amendment Case Relationship with Patent Applicant Nippon Hodo Co., Ltd. 4, Agent ■101 7. Contents of Amendment■ Table 3 on page 13 in the column for the description and detailed explanation of the invention is corrected as shown in the attached sheet. ■ Correct the drawings, Figures 1 to 10, as shown in the attached sheet. Procedural amendment (voluntary) June 10, 1991 Director General of the Patent Office Satoshi Uematsu 1990 Patent Application No. 331383 2 Title of invention Water-permeable composition 3 Relationship with the person making the amendment Patent applicant Nippon Hodo Co., Ltd. 4, Agent $101 6. Subject of amendment Description, detailed explanation of the invention, contents of amendment Procedures Amendment letter issued) September 2, 1991 1, Display of case 2000 Year Patent Application No. 331383 2 Name of the invention Water-permeable composition 3 Person making the amendment Relationship to the case Patent applicant 4 Agent ■ 101 7. Contents of the amendment (1) Specification, detailed description of the invention Column, Table 5 on page 18 is corrected as shown in the attached sheet. (2) The specification, Detailed Description of the Invention column, Table 6 on page 19 will be corrected as shown in the attached sheet. (3) The drawings, Figures 1 to 10, will be corrected as shown in the attached sheet. (Note) This is within the scope of the Sashimi invention.

Claims (2)

[Claims] (1) Particle size of slowly cooled slag, etc. produced as a by-product in blast furnaces: 25-5
Coarse grain products with a particle size of 5 to 0 mm, such as limestone,
At least one of fine particles such as granulated slag with a particle size of 2.5 to 0 mm; an aggregate consisting of 1 to 14% by weight of granulated slag fine powder; and 1 to 14% by weight of an alkali stimulant. 1. A water-permeable composition characterized in that the particle size curve of the aggregate is within the range X shown in FIG. (2) The water-permeable composition according to claim 1, wherein the alkaline stimulant comprises cement or gypsum.