JPS6259705A - Paving method - 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] [Industrial Application Field] The present invention relates to granulated granulated slag produced by treating molten slag (mine slag) as a byproduct during blast furnace steelmaking with water, and the final product of steelmaking. A method of paving using a surface material for paving consisting of a composition mainly consisting of a residue mainly composed of ferric hydroxide obtained from the waste liquid after pickling the iron chains attached to the surface of the steel. Regarding.

[Prior Art] Concrete pavement and asphalt pavement are known for road pavement, and also for tennis courts, playgrounds, schoolyards,
Clay pavement is usually used for paving parks and the like.

Concrete pavement is made by adding the necessary amount of water to gravel, sand, and cement, mixing them, and casting them into mortar. However, when paving long distances or wide areas like road pavement, Concrete pavement is not efficient, and it takes time to cure the poured concrete and dry the paved surface.

As a result, asphalt pavement, which is capable of using roller-based compaction methods, is rapidly taking over the mainstream of road paving.

Asphalt pavement is created by heating and melting asphalt produced as petroleum distillate, mixing it with gravel, crushed stone, etc., and applying a pressure-packing method. Asphalt as a surface layer material is applied on top using a roller or the like.

Therefore, it is not only necessary to arrange gravel, crushed stone, rubble, etc., but also a lot of complicated work and labor, such as softening and dissolving asphalt. In addition, clay pavement has a relatively weak surface layer, which causes problems such as softening of the surface layer due to rainwater, etc., and generation of dust due to drying.

[Problems to be Solved by the Invention] The biggest problem with the above-mentioned widely used paving materials and paving methods is that they require a lot of materials and labor and time for on-site construction. It is common for the main raw materials and auxiliary raw materials to be newly manufactured or harvested.

The inventors of the present invention have considered implementing concrete pavement using the compression method, which has been considered difficult in the past, and have achieved an economic advantage by utilizing materials that have not been discarded/regarded as industrial waste as part of the materials. The present inventors have discovered a paving method of the present invention that allows paving with excellent strength to be easily obtained using a pressure-filling method using rollers or the like while maintaining the properties of the paving.

[Means to Solve the Problem] The uninvented invention is based on granular granulated slag (a) obtained from molten slag by-produced during blast furnace steelmaking and hydroxylated slag obtained from pickling waste during steelmaking. Residue (b) whose main component is diiron, cement 1-(c), and an alkaline liquid containing 4% or less of cochloride (% by weight; the same applies hereinafter) in the liquid.
An aqueous solution (d
) is mixed and kneaded, and this kneaded product is used to pave by a pressure method.

The granulated slag (a) used in the above-mentioned method of the present invention was obtained as follows.

That is, molten slag (slag) is obtained as a by-product during blast furnace steelmaking in a steel mill, and this is granulated by being blown away with high-pressure water, cooled, and dehydrated to obtain particles with a particle size of 2 trrm or more. The granulated slag is called granulated slag, and contains about 5% of water that was added during granulation.

Molten slag itself obtained from blast furnaces has traditionally been crushed into appropriate sizes and used as roadbed material for roads and railways. Since then, its uses have expanded and it has come to be used as aggregate for cement, etc.

Next, the residue (b) containing ferric hydroxide as a main component used in the present invention was obtained as follows.

That is, at the final stage of ordinary steel manufacturing at a steelworks, iron chains, oil, etc. adhering to the surface of the steel are pickled with sulfuric acid or hydrochloric acid. When sulfuric acid is used as the pickling liquid, ferrous sulfate (FeS04) is contained in the waste liquid generated by this pickling.
Furthermore, when hydrochloric acid is used, ferrous chloride (FeCIz) is produced. When this pickling waste liquid is neutralized with slaked lime, ferric hydroxide (Fe(OH)3) is generated in the liquid, which is separated by sedimentation using a flocculant, and the residue obtained by dehydration is the same as the above-mentioned residue. This falls under (b).

This residue (b) is also commonly known as "weak acid decanter", and is iron rust in which iron molecules containing a large amount of water are intertwined in a cotton-like manner. It has properties. (The water content is approximately 75%) Therefore, the technology to utilize it has not been established, and natural evaporation of water cannot be expected even if it is disposed of in a landfill as industrial waste, so the ground of the landfill becomes soft and it is difficult to dispose of it. It's incredibly troublesome.

Surprisingly, the granulated slag (a) and the residue (
Cement (C) and an aqueous solution (d) composed of the above-mentioned specific compositions are mixed with both of b), mixed with Pjl nine times, and applied to the roadbed etc. to be paved. It was discovered that high-strength pavement can be created in a short period of time by applying pressure.

As the cement (C) in this case, commonly used paving cement such as Portland cement is used.

Further, as described above, the aqueous solution (d) is an alkaline liquid, that is, has a P) of 17 or more, preferably 9 to 12, and is mainly composed of an alkali metal salt containing 4% or less of a chlorinated Conoheld complex compound. Specifically, it is an aqueous solution obtained by reacting alkali metal salts such as carbon salts such as potassium, sodium, and lithium, bicarbonates, etc., and ammonium chloride, sodium chloride, etc. with cobalt chloride and elemental chloride. It is an aqueous solution containing 4% or less, preferably 0.1 to 0.5%, of a cobalt chloride amine complex compound.

The amounts of each of these compounds (a) to (d) are preferably blended in the following proportions.

That is, the granulated slag (a) and the residue (b) have a content of 5 to 35%, particularly preferably 1%, of the residue (b) relative to the total amount of both.
It is blended in an amount of 0 to 30%, particularly around 10%.

In addition, the blending amount of cement (c) relative to the total amount of granulated slag (a) and residue (b) is 10 to 30%, preferably 20 to 30%, while the aqueous solution (d) is cement).
10% or less, preferably 10 to 10% of the amount used in (c)
The range is 7%.

[Function] The above-mentioned residue (b) is expensive if it is attempted to treat the water that is difficult to separate therein with thermal energy.
It's totally pointless - I can think of it.

In the present invention, the moisture contained in the residue (b) is intended to be used as a water retention agent in concrete pavement, and based on this idea, the granulated slag (a) and the residue (b) containing a large amount of moisture are used. The cement (C) and the aqueous solution (d) are mixed and stirred to perform pressure paving, and the effect is estimated to be as follows.

That is, by first mixing the proper amounts of each of the components (a) to (d) and stirring, the water in the residue (b) and the water in the aqueous solution (d) are mixed into the granulated slag (a). and undergoes a hydration reaction with cement (C).

The residue (b) in the granulated slag (a) has a wide particle size distribution of 211111 to 0.07 mm.
Fine particles of residue (b) and particles of granulated slag (a) with a low water content (i.e., granulated slag (a)) are surrounded by particles with a high water content (this is considered to be granulated slag with a large particle size). It is thought that the granulated slag particles (which are considered to be granulated slag particles with a small particle size) and cement (c) are attached to each other, and the above-mentioned fine particles are further interposed in the gaps between these particles to form an aggregate.

Then, by applying pressure paving to these at the actual construction site without using water, the aggregates of each of the particles become densely packed, the air in the gaps is eliminated, and at the same time Slag (a) and residue (b)
The water retained inside oozes out and completes the hydration reaction with the cement.
The length of the pavement can be completed in an extremely short period of time.

In this case, the aqueous solution (d) is the granulated slag (a) residue (b)
, and cement) (C), which can accelerate the hardening effect by reaction and complete pavement with excellent strength in a short time.9 Of these (a) to (d), granulated slag (a)2
The residue (b) and the aqueous solution (d) are prepared by pre-mixing one of these two or any one of these two, and then adding it to cement at the construction site.
All may be mixed together with (C), or (a) to (d)
) may be mixed and paved at the construction site.

The pavement thus obtained is red in color because the residue (b) contains red iron oxide fine particles, making it possible to provide an ideal pavement with a red color. .

[Example J] The present invention will be specifically described below with reference to Examples and Comparative Examples.

Granulated slag with a particle size of 2 mm + ~ 0.07 mrs (a) obtained by crushing molten slag produced as a by-product during blast furnace steelmaking (a)] OK
g. Pickling generated during steel manufacturing 1. T-Residue containing ferric hydroxide obtained from waste liquid (b) 4Kg, cement (c)
4.2Kg, and 0.4Kg of a cobalt chloride complex compound-containing aqueous alkali metal salt solution (d) obtained by the following formulation,
The above (a) to (d) were kneaded to obtain about 18 kg of a mixture.

"Aqueous alkali metal salt solution containing cobalt chloride rust compound (d
) Sodium chloride 8.5% Potassium carbonate 6.0% Sodium carbonate 7.0% Ammonium chloride 1.5% Cobalt chloride 0.3% Water 78.7%These (
When a) to (d) were mixed at a construction site for road paving and applied to the roadbed under pressure, a strong paved road could be created in about 4 hours.

ratio "L example".

Without using the aqueous solution (d) in Example 1 (a
) to (c) were blended and paved in the same manner as in Example 1.

The physical properties of the road pavement prepared bodies obtained in Example 18 and Comparative Example 1 were investigated on the 3rd and 7th day after construction. The results are shown in Table 1.

Table 1: Effects of the Invention] The surface material for pavement of the present invention uses granulated slag (which is an originally unnecessary product that is produced as a by-product along with the target product during iron manufacturing).
a) and the originally unnecessary residue (b) obtained during steel manufacturing are skillfully combined to create cement (c) td and aqueous solution (d).
By kneading the mixture and applying pressure to the roadbed, etc., it is possible to form a roadbed with a strong surface layer in a short time.

Furthermore, the method of the present invention uses a compression method, which cannot be achieved with the concrete paving method, and is also defective in that it can pave without using water for cross-conducting.

In addition, the above-mentioned residue (
The present invention is also excellent in that it has discovered the utility value of b) and attempted to utilize it effectively, and the present invention has extremely high utility value in these respects.

Claims (2)

[Claims] (1) Granular granulated slag obtained from molten slag by-produced during blast furnace steelmaking (a) and residue mainly composed of ferric hydroxide obtained from pickling waste during steelmaking (b) , cement (c), and an aqueous solution (d) which exhibits alkaline liquid properties and is mainly composed of an alkali metal salt containing 4% by weight or less of a cobalt chloride complex compound in the liquid, and this kneaded product is mixed and kneaded. A paving method characterized by paving using a compaction method. (2) The granulated slag (a) and the residue (b) are blended in an amount of 5 to 35% by weight based on the total amount of the residue (b),
The cement (c) is 10 to 30% by weight of the total amount of the granulated slag (a) and the residue (b), and the aqueous solution (d) is 10% by weight or less of the cement (c). A paving method according to claim 1.