JPH041242A - Production of oil-absorbing aggregate from zeolite and the like and oil-absorbing aggregate prepared therewith - Google Patents

Abstract

PURPOSE:To secure abradability, the applicability in paving work, and the oil absorbing properties after application by adding water to a mixture of a powdered or cake-like zeolite with a specific binder and/or a property modifier, then forming the mixture into blocks, and curing and drying the blocks. CONSTITUTION:A powdered or cake-like zeolite is mixed with 20-75% binder selected from the group consisting of a cement, fine blast furnace slag powder, and fly ash and/or property modifier to give a mixture. After is added to the mixture, it is granulated or press molded into blocks, cured by steam or at room temp., and dried to give an oil-absorbing aggregate having an oil- absorption of 30-100%.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for producing oil-absorbing aggregate with excellent abrasion resistance using artificial zeolite, and to the oil-absorbing aggregate.

BACKGROUND OF THE INVENTION Zeolites are produced naturally, artificially, or synthetically, and their porous properties are utilized for a variety of applications, such as adsorbents, deodorizing materials, and soil improvement materials. The use and amount of zeolite used has been limited due to the balance between its manufacturing cost and porous properties.

The present inventors conducted research on manufacturing artificial zeolite by boiling fly ash in an alkaline aqueous solution (Japanese Patent Laid-Open No. 84
-24014), various properties of such artificial zeolite were investigated and it was confirmed that it had extremely high oil absorption.

Problems to be Solved by the Invention As is well known, asphalt-paved roads are constructed by mixing various aggregates and fillers with asphalt as a binder and heating the mixture to impart softening properties.

Therefore, especially in the summer, direct sunlight damages the road surface by 7.
It is heated to nearly 0°C, and the light oil in the asphalt seeps out onto the road surface, softening and becoming fluid. When a heavy vehicle or the like passes through a road surface in such a state, it deforms and causes ruts, etc., shortening the lifespan of asphalt pavement.

In addition, when the light oil content in the asphalt of an asphalt-paved road evaporates, the binder effect decreases, causing various aggregates and fillers to flake off, shortening the life of the asphalt.

The present invention aims to provide not only workability but also long-term stability by applying the above-mentioned artificial zeolite to a part of the aggregate, which is an asphalt pavement material, by retaining the light oil content in the asphalt for a long period of time. However, as a road aggregate, a corresponding level of strength is required.

That is, it is important to ensure abrasion resistance and oil absorption properties during pavement construction and after construction as a road aggregate.

Means for Solving the Problems The present invention provides powder or cake-like zeolite with 20 to 80% of one or more of cement, pulverized blast furnace slag, and fly ash as a binder and/or property modifier.
A method for producing an oil-absorbing aggregate characterized by adding water to a blended mixture, agglomerating it, curing it in steam or at room temperature, and drying it, and adding a binder and/or a property modifier to powdered or cake-like zeolite. An oil-absorbing aggregate using zeolite powder, etc., characterized in that one or more of cement, pulverized blast furnace slag, and fly ash are mixed and agglomerated to have an oil absorption of 30 to 100%. It is.

Effects of the present invention The present invention is characterized in that powder or cake-like zeolite is blended with one or more of cement, pulverized blast furnace slag, and fly ash as a binder and/or property modifier in an amount of 20 to 80%. , water is added to this mixture to agglomerate it.

In this case, if the amount of the binder and/or property modifier is less than 20% of the powder or cake zeolite, the abrasion properties of the agglomerated material will be poor and the strength as an aggregate cannot be achieved. If the amount of the binder and/or property modifier exceeds 80%, there will be no problem with the strength of the aggregate, but the oil absorption will decrease.

Therefore, the amount of binder and/or property modifier may range from 20 to
It shall be 80%. The amount of the binder and/or property modifier can be adjusted between 20 and 80% depending on the region to be paved with asphalt, that is, extremely hot, warm, or cold regions.

As a means for adding water to the above-mentioned mixture and agglomerating it, a normal granulation method such as a pelletizing method or an agglomeration method such as a pressure molding method can be applied.

By curing the agglomerated material in steam or at room temperature and drying it, an oil-absorbing aggregate with excellent abrasion properties can be produced.

In addition, one or more of cement, pulverized blast furnace slag, and fly ash may be mixed with the powder or cake-like zeolite of the present invention as a binder and/or property modifier.
In oil-absorbing aggregates that have been agglomerated and have an oil absorption of 30 to 100%, if the oil absorption is less than 30%, the abrasion resistance of the agglomerates is comparable, but after the construction of an asphalt paved road. Light oil content becomes insufficiently captured when the temperature rises due to direct sunlight.

On the other hand, if the oil absorption exceeds 100%, too much light oil will be absorbed during heating and kneading during construction of asphalt pavement.
Problems arise such as having to raise the heating temperature or increasing the amount of asphalt used to reduce the fluidity of the asphalt mixture before construction.

Therefore, the oil absorption should be 30 to 100%. The oil absorption amount of this agglomerate can be adjusted by adjusting the blending amount of the binder and/or property modifier, and this oil absorption amount is 3.
The oil absorption amount can be adjusted between 0% and 100% depending on the region to be paved with asphalt, that is, extremely hot, warm, or cold regions.

Example blending ratio (%) Sample Cement Blast furnace slag powder Fly ash a 20 0 0
b 20 0 2
0c 20 0
40d 20 0
60e 20 0
Bof 10 10
Granulation and curing The above blend was kneaded using a roller mixer, an appropriate amount of water was added, and the mixture was granulated to a size of 5 Iφ or less. Also, 35℃
After curing at room temperature for 17 days, it was dried.

The results of evaluating the aggregate produced under the above conditions on the following items are shown.

Evaluation item abcdef Measurement method Water absorption rate
98.0% 75.0! 58.0$ 3
8.0% 25. K! 35.0% JIS-A
-1110 unit volume weight 0.48 0.8?
0.83 1.03 1.25 1.35 J
IS-A-1104 Abrasion loss 85.3$ 4
8.0$ 29. Om 23.0$ 21.0$
27.11X JIS-A-1121 oil absorption rate
98.0% 75.3 pieces 48.5 dollars 29.
0$ 25.0'! 50.7$ JIS-A-
5101 average particle size 2.3■ 2.2 garden 2.1■
2,0■ 2. Om 2.1m1lI As described in detail, the present invention takes advantage of the absorption properties of zeolite while enhancing the abrasion properties of its agglomerates with a binder and/or
Alternatively, the oil-absorbing aggregate obtained by the method of the present invention and its production method can be ensured by blending a property modifier, without reducing the workability of asphalt paved roads.
It extends its lifespan.

Claims (2)

[Claims] (1) Cement, pulverized blast furnace slag powder, etc. as a binder and/or property modifier for powder or cake zeolite.
A method for producing an oil-absorbing aggregate, which comprises adding water to a mixture containing 20 to 75% of one or more types of fly ash, agglomerating it, curing it in steam or at room temperature, and drying it. (2) Cement, pulverized blast furnace slag, powdered or caked zeolite as a binder and/or property modifier;
An oil-absorbing aggregate using zeolite powder or the like, characterized in that one or more types of fly ash are mixed and agglomerated to have an oil absorption of 30 to 100%.