JPH10121045A - Clay paving material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a clay paving material which can realize a clay paved surface excellent in dustproofing properties while fully utilizing slags by adding a clay paving material and city water sludge containing a coagulant to a converter slag or an electric furnace slag and kneading the resulting mixture. SOLUTION: 30-90vol.%, in total, soil paving material and city water sludge are added to a converter slag or an electric furnace slag, and the resulting mixture is kneaded to obtain a clay paving material. The ratio of the city water sludge to the soil paving material is 10-50vol.%, and both are added in such amounts that the clay silt content may be 10-50%, and the fine sand content may be 20-40%. This material is laid on a paving foundation, leveled and compacted, whereupon a paved surface having suitable hardness and good moisture retentivity can be formed because the coagulant in the sludge covers the slag particles, the soil particles and the sludge particles to made their adhesive bonding possible. This material has a high specific gravity, so that it can resist dusting even if the paved surface is broken. Because of the suitable gaps among crumbs, it has good water permeability and good cushioning performances characteristic of clay pavement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clay paving material used for a ground or a multipurpose open space.

[0002]

2. Description of the Related Art In the refining and refining of metals such as iron, non-metal refined products (slag) are generated in a converter or an electric furnace due to a reaction between impurities and a solvent. Although slag is collected from the furnace on a regular basis, it is used for mortar and concrete as slag sand, and there is no effective way to find it yet. From the viewpoint of resource and energy saving, more effective use is required. You.

[0003] In the conventional clay pavement, the pavement surface is destroyed by spikes or the like, and when it is dried and pulverized, it becomes dust and tends to fly. As a method of preventing this, spraying calcium chloride and magnesium chloride, etc., and mixing it with the soil have been performed, but calcium chloride and magnesium chloride have deliquescence, so they dissolve in rainfall and flow easily, Its sustained effect cannot be expected for a long time.

[0004]

As shown in the table below, converter slag and electric furnace slag have a very large specific gravity as compared with the main soil.

[0005]

[Table 1]

[0006] For this reason, it is characterized in that it is difficult to fly up as dust, but on the other hand, it does not have the necessary viscosity and compaction strength, and thus cannot be used as a clay paving material as it is. In addition, it is becoming increasingly difficult to meet the demand for pavement soil materials such as Arakita soil with the spread of competition facilities and the like.

The present invention has been made in view of such circumstances, and realizes a clay-paved surface having excellent dust-proof properties by utilizing the characteristics of slag, thereby promoting effective use of slag and saving of earth pavement materials. With the goal.

[0008]

According to the present invention, earth pavement material and tap water sludge to which a coagulant has been added are added to a converter slag or an electric furnace slag and kneaded.

In this case, the converter slag or the electric furnace slag has a clay silt content of 10 to 50% and a fine sand content of 20 to 40%.
%, And the kneading is performed by adding a soil pavement material and tap water sludge having a volume ratio of 30 to 90%, of which the tap water sludge has a volume ratio of 10 to 50% with respect to the soil pavement material. .

[0010]

[Effect] For example, a mixture of a converter slag or an electric furnace slag to which earth pavement material and water sludge are added and kneaded is laid on a pavement foundation, and when leveling and compaction are performed, a coagulant of the water sludge is obtained. Covers the slag particles, the soil particles and the sludge particles and adhesively bonds these particles to each other, thereby forming a pavement surface having appropriate hardness and good moisture retention. Since the binding particles (agglomerates) contain slag particles, not only the particle size but also the specific gravity increase, so that the paved surface is broken by spikes and the like, and even if it is dried, it is difficult to be easily scattered. In addition, since an appropriate interval is maintained between the aggregates, good water permeability (water drainage) is obtained, and a good cushion characteristic peculiar to clay pavement can be obtained.

The mixing ratio depends on the components contained in each material in order to secure the compaction strength required for clay pavement.
% And fine sand content are determined appropriately within the above ranges so as to be 20 to 40%.

[0012]

The converter slag or the electric furnace slag has a clay silt content (particle size of 74 μm or less) of 0 to 10% as slag sand.
A material containing fine sand (particle size: 75 to 425 μm) at a ratio of 20 to 50% is used. As the clean water sludge, sediment that precipitates due to the addition of a polymer flocculant in the water purification process, such as polymer-added pelletized condensed sludge or PAC treated sludge, is pulverized to fine sand or less in an appropriate dry state. use. For soil paving materials, sandy soil produced from plants will be used.

[0013] Then, tap water sludge and plant-grown sandy soil are appropriately mixed with the slag sand, and the mixture is sufficiently kneaded with a kneader while appropriately adding water as needed. From the viewpoint of securing the compaction strength required as clay paving material, slag sand is 10 to 70% in volume ratio so that the clay silt content is 10 to 50% and the fine sand content is 20 to 40% as a whole. The volume ratio of grassy sandy soil and tap water sludge is 30 to 90%, of which the tap water sludge is 1% by volume ratio to grassy sandy soil.
Mix at a rate of 0-50%.

[0014] As described above, a sufficiently kneaded mixture of slag sand, sandy soil produced from plants and water and sludge is laid, for example, on a pavement foundation, and when leveling and compaction are performed, polymer sludge of the water sludge is obtained. Since the agent covers the slag particles, the earth particles, and the sludge particles and adhesively bonds these particles to each other, it is possible to form a pavement surface having appropriate hardness and good moisture retention.

Since the binder particles (agglomerates) contain slag particles, not only the particle size but also the specific gravity increases, so that the pavement surface is broken by spikes and the like, and even if it dries, it is difficult to fly easily. In addition, since an appropriate interval is maintained between the aggregates, water permeability (water drainage) is good, and a good cushion property peculiar to clay pavement is secured.

[0016]

[Test Example] Twelve kinds of samples described in the following table were prepared by changing the mixing ratio (volume ratio) of each material.

[0017]

[Table 2]

The particle size ratio of each sample was examined, and the results are summarized in the following table.

[0019]

[Table 3]

The samples were subjected to a compaction test and a flying test.

(Compaction test)
Using a m mold and a 2.5 kg rammer, each sample was compacted to a height of -5 cm, a compacted layer of 2 layers and a compaction frequency of 25 times per layer. A penetration test was performed to measure the penetration strength. This measurement is per sample
The test was carried out on several specimens having different water contents, and the highest measured value was described as compaction strength in the following table together with the water contents at that time.

[0022]

[Table 4]

According to the test results, no penetration strength was observed with slag sand alone. However, a mixture of sandy soil produced from plants and water and sludge from tap water produced penetration strength corresponding to the mixing ratio. Can be confirmed. For example, when trying to obtain a hard pavement surface, it is sufficient to knead the sample 7 at a mixing ratio of 16.92 with a water content of 16.92.

(Scattering test) In this test, in the above-mentioned compaction test, these samples were kneaded at the water content described in the compaction strength of each sample, and then these were almost completely dried. The quantitation is dropped from above at the wind outlet of the wind tunnel tester so as to cross it.

Then, at a predetermined distance in the vertical direction from the drop of the sample, in a predetermined plane range (in the direction perpendicular to the blowing wind (lateral direction), 12 cm left and right around the drop, in the downstream direction of the wind ( A rectangular area of 31 cm) is set in the vertical direction), and the weight of the sample that falls within that range is
It was measured as the amount of residue that was not scattered by the wind, and the ratio to the amount dropped (quantitative) is shown in the table below. For one sample, the wind speed at the exit of the wind tunnel tester was 4 m / s, 8
Data were collected in four stages of m / s, 12 m / s and 16 m / s.

[0026]

[Table 5]

From the test results, the scattering amount is clearly reduced in Samples 1 to 11 in which plant-grown sandy soil and tap water sludge are mixed with Sample 12 in which only slag sand is used. As a result, the slag particles, the soil particles, and the sludge particles are bonded to the aggregate having a large specific gravity by the binding force of the polymer flocculant (that is, the weight of the slag particles and the binding force of the water sludge are reduced). Can be confirmed.

[0028]

According to the present invention, it is possible to form a pavement surface which has good properties peculiar to clay pavement, and is excellent not only in durability and water resistance but also in dustproofness. In addition, it is possible to promote the effective use of converter slag and electric furnace slag and the saving of earth pavement materials.

Claims (2)

[Claims] 1. A clay paving material comprising a converter slag or an electric furnace slag mixed with an earth pavement material and a water sludge to which a coagulant has been added. 2. The soil pavement material and tap water sludge are added to the converter slag or electric furnace slag in a volume ratio of 30 to 90% so that the clay silt content is 10 to 50% and the fine sand content is 20 to 40%.
2. The clay paving material according to claim 1, wherein water sludge is added and kneaded in a ratio of 10 to 50% in volume ratio to the earth pavement material.