KR20150077520A - Artificial Aggregate of Crushed-stone Sludge using Inorganic Materials - Google Patents

Artificial Aggregate of Crushed-stone Sludge using Inorganic Materials Download PDF

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Publication number
KR20150077520A
KR20150077520A KR1020130165345A KR20130165345A KR20150077520A KR 20150077520 A KR20150077520 A KR 20150077520A KR 1020130165345 A KR1020130165345 A KR 1020130165345A KR 20130165345 A KR20130165345 A KR 20130165345A KR 20150077520 A KR20150077520 A KR 20150077520A
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KR
South Korea
Prior art keywords
aggregate
sludge
artificial aggregate
artificial
stone
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KR1020130165345A
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Korean (ko)
Inventor
홍기남
한상훈
박재규
지세영
심원보
Original Assignee
충북대학교 산학협력단
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Priority to KR1020130165345A priority Critical patent/KR20150077520A/en
Publication of KR20150077520A publication Critical patent/KR20150077520A/en

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/02—Agglomerated materials, e.g. artificial aggregates
    • C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/02—Agglomerated materials, e.g. artificial aggregates
    • C04B18/027—Lightweight materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/0418—Wet materials, e.g. slurries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Civil Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

Disclosed is an artificial aggregate composition of crushed stone sludge using inorganic materials, which comprises: 60 wt% of crushed stone sludge; 7.2-10.8 wt% of alumina cement; 13.2-16.8 wt% of anhydrous gypsum; and 15.8-16 wt% of cement. The artificial aggregate is manufactured by using inorganic materials under normal temperature to be lightweight while exhibiting the same strength as typical concrete.

Description

Technical Field [0001] The present invention relates to an artificial aggregate of crushed-stone sludge using inorganic materials,

The present invention relates to a composition for artificial aggregate of stone dust sludge using an inorganic material, and more particularly, to a method for manufacturing an artificial aggregate using an inorganic material at room temperature by removing the conventional method of producing artificial aggregate by high- And more particularly to a composition for artificial aggregate of stone dust sludge using an inorganic material.

More than 94% of coarse aggregate in concrete is supplied as crushed gravels produced in the mountain, and fine aggregate is supplied from various aggregate sources such as river sand, sea sand, and crushed sand produced from the mountain. Crushed sand, which was not used until the mid-1990s, has been used up since the late 1990s due to depletion of natural sand.

It is estimated that about 47% of the crushed sand is produced, and more than 2.5 million tons / year of sludge is generated in Korea. In the past, the stone sludge was mainly used as a reclaimed material in the restoration of the damaged stone development site. Recently, however, the Ministry of Environment and the Forest Service have banned the legal use of stone dust as industrial waste. Since the stone industry sludge companies have to deal with the waste sludge through the waste disposal company after the government announcement, the profitability of the stone sludge producers is extremely deteriorating. Some companies are not able to overcome the cost burdens and the stone sludge is left in the workplace or illegally reclaimed. Heavy metal contained in bedrock and buried stonewashed sludge in the mountains is polluting the surrounding soil and groundwater and is pointed out as the main cause of environmental destruction. Therefore, it is urgently required to develop a recycling technology of the sludge sludge capable of meeting the social demands of environmental problem solving and resource recycling.

Studies on the existing stone sludge have been mainly studied as alternatives to fine aggregate, and there are other methods of producing high temperature calcined artificial aggregate. The problem of this study is that, in the case of fine aggregate substitution research, as the mixing ratio of fine aggregate increases, the compressive strength and the whip strength decrease, and the maximum mixing ratio is limited to less than 20%. In the case of manufacturing method of high temperature calcination, And cost problems arising from the high-temperature firing process. Lastly, when production is not possible with large-capacity plants, production is low, and bunker c oil is usually used as fuel for high-temperature firing of artificial aggregates. In countries where environmental regulations are severe, such as in Korea, I have a problem.

In the case of artificial aggregate, clay is commonly used. In the US and European countries, natural raw materials can be easily obtained to produce artificial aggregates. However, in Korea, it is difficult to supply natural raw materials for producing artificial aggregates. In the study. Also. The artificial aggregate manufactured in each country has different quality of aggregate according to the raw material, and the strength of aggregate is weak, so that the application of general concrete structure is limited.

1. Korean Published Patent No. 10-2012-0097926 (September 5, 2012)

It is an object of the present invention to provide a composition for artificial aggregate of sludge sludge using an inorganic material capable of ensuring mass use of the sludge sludge generated in the process of collecting aggregate and recycling waste.

It is another object of the present invention to provide a composition for artificial aggregate of stone dust sludge using an inorganic material which is capable of removing the conventional artificial aggregate manufacturing method at high temperature and securing the same strength as that of ordinary concrete using inorganic material at room temperature .

In order to achieve the above object, a composition for artificial aggregate of a stone mortar according to the present invention comprises 60 wt% of a stone sludge, 7.2 to 10.8 wt% of alumina cement, 13.2 to 16.8 wt% of anhydrous gypsum and 15.8 to 16 wt% of cement .

The stone sludge is granite or weathered rock powder.

The moss is added in an amount of 0.1 to 0.5 wt% relative to the cement so as to have a viscosity.

According to the present invention, an artificial lightweight aggregate which has been produced at a high temperature (1200 DEG C) can be produced even at room temperature (20 DEG C or higher), and alumina cement and anhydrous gypsum are used, And the like. Further, by using the mecellose, the viscosity of the paste of the aggregate can be controlled so that the bubbles are trapped by the viscosity during the process of producing the aggregate, so that the weight of the aggregate can be reduced.

According to the present invention, an aggregate having a spherical particle size can be manufactured by using a kneader, a ventilator, a ventilator, and a Pan molding machine in the process of manufacturing an artificial aggregate, and the particle size of the aggregate is also changed depending on each molding frame. It can be manufactured up to 5 ~ 40mm in size.

Therefore, it has a specific gravity and a water absorption ratio similar to those of the fired artificial aggregate, so that there is no problem in manufacturing a lightweight concrete structure.

FIG. 1 (a) is a photograph showing a stone dust produced in a cake state by agglomerating the stone dust generated in the process of collecting sand and gravel with an aggregating agent.
FIG. 1 (b) is a photograph showing a fine powder of a sludge sludge kept at room temperature by crushing the cement-based sludge sludge at a temperature of 100 ± 10 ° C. into a fine powder of 5,000 cm 2 / g or more using a crusher.
FIG. 2 is a schematic view showing a part in which the stone dust sludge is mixed and a part in which the inorganic materials are mixed in the present invention.
3 is a graph showing XRD analysis of the stiffness of the artificial aggregate according to the present invention.
4 (a) to 4 (b) are photographs showing a process for producing an artificial aggregate with a stone sludge according to the present invention.
FIG. 5 is a photograph showing a cross section of the concrete after using the artificial aggregate manufactured according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a composition for artificial aggregate using a mineral material according to the present invention will be described in detail with reference to the accompanying drawings.

Most of the existing aggregate manufacturing methods utilize the property of vitrification of aggregate surface at a suitable reducing atmosphere and high temperature (about 1,100 ~ 1,250 ℃). The heat inside the aggregate decomposes organic matter, carbonate, and sulfate minerals in the raw material, and CO 2 , CO, SO 2, etc. are generated. The organic matter as a carbon-containing material is not burned well under a reducing atmosphere, and unburned carbon is present even after a lapse of time. A chemical reaction takes place between the unburnt carbon left in this way and iron oxide (Fe 2 O 3 ) in the raw material. The inside of the aggregate is melted in a reducing atmosphere and a high temperature to become a liquid having a high viscosity. The gas generated from the inside is confined in the melt of high viscosity and the artificial aggregate is produced by the mechanism that the aggregate expands.

However, in this technology development, since most of the materials for manufacturing artificial aggregate are inorganic materials, it is assumed that the remaining portion except for the amount of sludge inclusion is the strength that the aggregate can give, and when the mixing ratio of the sludge sludge is 60% 40% was determined as the amount of inorganic materials. In addition, the remaining 40% was converted into 100% again, which contributed to the intensity expression by calculating the amount of each material. In case of alumina cement, alumina cement is used as a crude steel in order to be ready to use immediately as in the case of ordinary crushed aggregate and artificial aggregate. In the case of anhydrous gypsum, most inorganic materials are shrinkable. Anhydrous gypsum was used in consideration of the problem that it may occur nonuniformly. These materials react with water to cure and produce etrinite, which serves to compensate for the shrinkage of the aggregate and to express early strength. Finally, the mecellose was used to create a viscosity that allows the materials presented above to retain their shape in aggregate formation.

The composition for artificial aggregate using the inorganic material according to the present invention contains 60 wt% of the stone sludge, 7.2 to 10.8 wt% of the alumina cement, 13.2 to 16.8 wt% of the anhydrous gypsum, and 15.8 to 16 wt% of the cement.

At this time, the composition may be formed so as to have viscosity by adding 0.1 to 0.5 wt% of mecellose to the cement.

The above-mentioned stone dust sludge is produced by agglomerating the stone powder produced in the process of collecting sand and gravel with a flocculant to form a cake state, and using the crusher at a temperature of 100 ± 10 ° C, the powder state of the cake is 3,000~6,000 ㎠ / g Pulverized into a fine powder form and stored at room temperature. The fine powder of the above-mentioned stone sludge is preferably weathered rock or granite.

The inorganic material is a composition such as alumina or anhydrous gypsum. The inorganic material is divided into a weight ratio of 10 to 40% by volume to 100% so that the inorganic materials can produce etheneite to the maximum. The divided contents can show the difference in the amount of ettringite used according to the mixing ratio of the sludge sludge, and this structure is shown in FIG.

Table 1 below shows the mixing ratios for producing artificial aggregate artificial aggregate and is a table showing that the stone dust sludge, alumina cement, anhydrous gypsum, cement, and mecellose shown in Fig. 2 can be divided into weight ratios to produce ettringite. The alumina cement used in this study has quick hardness and toughness and anhydrite is used to determine the shrinkage for the uniformity of grain size of artificial aggregate. Methylcellulose was used to ensure a minimum viscosity for the manufacture of artificial aggregates.

Stone powder sludge
(wt%) Alumina cement
(wt%) Anhydrous plaster
(wt%) cement
(wt%) Messelos
(wt%) 60 7.2 16.8 15.8 0.2 60 8.4 15.6 15.8 60 9.6 14.4 15.8 60 10.8 13.2 15.8

As shown in Table 1, the manufacturing theory of the curing type artificial aggregate at room temperature (0 to 40) at room temperature is based on the use of an optimal binder (alumina cement, anhydrous gypsum, cement mecellose) It is a blending ratio to produce aggregate with shape. The combination of WE-S60-AC9.6-A14.4-C16 and GR-S60-AC9.6-A14.4-C16 was obtained with the best combination for producing artificial aggregate.

3, XRD analysis of an aggregate made of a composition such as alumina, anhydrous gypsum, etc., which are inorganic materials, of two kinds of stone sludge (weathered rock and granite), each artificial aggregate composition is composed of etalinite (3CaOAl 2 O 3 3CaSO 4 32H is a graph that ensures 2 O) is generated, a granite stone dust artificial aggregates from analysis punghwaam stone dust artificial aggregates than eth- Lin gayiteu (3CaOAl 2 O 3 3CaSO 4 32H 2 O) is seen that the content is more Can be a graph. As a result, the aggregate can be shrunk and the aggregate having high rigidity can be produced.

4 (a) to 4 (b) are photographs showing a process for producing an artificial aggregate with a stone sludge according to the present invention.

4 (a) shows a state where one of two kinds of sludge is selected and a material is mixed in a cake state. FIG. 4 (b) shows a state in which a stone- I do it. In this case, the number of repetition is increased by 10 to 20 times in the winter. FIG. 4 (c) shows a state in which a sample of a plane shape is subjected to extrusion by applying 0 to 20 heat, and in the ordinary extrusion molding process, additional heat is applied to reduce the loss of the material, Thereby helping the material react. FIG. 4 (d) shows the shape of the artificial aggregate formed into a circular shape, and the formed artificial aggregate can be directly used as an aggregate, or the artificial aggregate can be manufactured in the form of a complete sphere by adding a molding process.

The produced artificial aggregate has a specific gravity of 1.6 to less than 2.0, a water absorption of 1 to 10%, a unit mass of 1015 to 1086 kg / m3, a win rate of 54 to 64, a chloride content of 0.04 or less, and a stability of 12 or less 5).

Claims (3)

Wherein the slurry contains 60 wt% of sludge sludge, 7.2 to 10.8 wt% of alumina cement, 13.2 to 16.8 wt% of anhydrous gypsum, and 15.8 to 16 wt% of cement. The method according to claim 1,
Wherein the stone sludge is granite or weathered rock powder. The method according to claim 1,
The composition for artificial aggregate according to any one of claims 1 to 3, further comprising 0.1 to 0.5 wt% of mecellulose added to the cement so as to have a viscosity.
KR1020130165345A 2013-12-27 2013-12-27 Artificial Aggregate of Crushed-stone Sludge using Inorganic Materials KR20150077520A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220111523A (en) * 2021-02-02 2022-08-09 주식회사 이노씨에스알 mortar composition using granite sludge
CN116102278A (en) * 2023-02-24 2023-05-12 安徽中铁工程材料科技有限公司 Granite-based mineral admixture and preparation method and application thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220111523A (en) * 2021-02-02 2022-08-09 주식회사 이노씨에스알 mortar composition using granite sludge
CN116102278A (en) * 2023-02-24 2023-05-12 安徽中铁工程材料科技有限公司 Granite-based mineral admixture and preparation method and application thereof

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