JP2013139358A - Method of producing water granulated blast-furnace slag aggregate - Google Patents
Method of producing water granulated blast-furnace slag aggregate Download PDFInfo
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- JP2013139358A JP2013139358A JP2011290465A JP2011290465A JP2013139358A JP 2013139358 A JP2013139358 A JP 2013139358A JP 2011290465 A JP2011290465 A JP 2011290465A JP 2011290465 A JP2011290465 A JP 2011290465A JP 2013139358 A JP2013139358 A JP 2013139358A
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- furnace slag
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- 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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Abstract
Description
本発明は、ブリージング特性が優れた高炉水砕スラグ細骨材の製造方法に関する。 The present invention relates to a method for producing granulated blast furnace slag fine aggregate having excellent breathing characteristics.
従来、高炉水砕スラグの多くはセメント原料・混和材として利用されているが、この用途での需要も限界があることから、今後は天然砂代替の細骨材としての利用拡大が期待されている。
しかし、従来の高炉水砕スラグ細骨材は、天然砂に較べてブリージング特性が劣るため単独では用いず、天然砂と混合して利用されるのが一般的である。ここで、ブリージングとは、コンクリートが硬化する前に骨材が沈み込み、表層に水が浮上する現象を指し、ブリージング特性とは、そのような現象を生じにくい性能を指す。ブリージングは、コンクリートのひび割れ等の原因となる。
Conventionally, most of granulated blast furnace slag has been used as a raw material and admixture for cement, but since there is a limit to the demand for this application, it is expected to expand its use as a fine aggregate instead of natural sand in the future. Yes.
However, conventional blast furnace granulated slag fine aggregates are generally not used alone because they have inferior breathing properties compared to natural sand, but are generally used by mixing with natural sand. Here, breathing refers to a phenomenon in which aggregates sink before concrete hardens, and water floats on the surface layer. Breathing characteristics refer to performance that hardly causes such phenomena. Breathing causes concrete cracks and the like.
高炉水砕スラグ細骨材がブリージング特性に劣る主因は、スラグ表面がガラス質であるため、天然砂に比較して保水性が劣るためである。保水性が劣るのは、比表面積が小さく、表面水を保持する空間がほとんど無いことが原因であると考えられている。
高炉水砕スラグ細骨材のブリージング特性を改善するための従来技術としては、下記のようなものがある。
（1）粒度分布調整により比表面積を大きくする方法
（2）アルカリ処理により比表面積を大きくする方法（特許文献１）
（3）スラグにポリマーを散布することにより、保水性を高める方法（特許文献２）
The main reason why the granulated blast furnace slag fine aggregate is inferior in breathing characteristics is that the surface of the slag is vitreous, and the water retention is inferior to natural sand. The reason why water retention is poor is considered to be that the specific surface area is small and there is almost no space for holding surface water.
Conventional techniques for improving the breathing characteristics of blast furnace granulated slag fine aggregate include the following.
(1) Method of increasing specific surface area by adjusting particle size distribution (2) Method of increasing specific surface area by alkali treatment (Patent Document 1)
(3) Method to increase water retention by spraying polymer on slag (Patent Document 2)
しかし、上記（1）の方法は、粒度を細かくすると比表面積を大きくすることはできるが、流動特性などが悪化してしまう問題がある。
上記（2）の方法は、アルカリを添加し、高温処理するものであるが、処理設備や加熱、薬剤に要するコストなど、処理に多大なコストがかかる。また、上記（3）の方法も、同様に処理に多大なコストがかかる。
However, although the method (1) can increase the specific surface area by reducing the particle size, there is a problem that the flow characteristics and the like deteriorate.
In the method (2), alkali is added and high-temperature processing is performed, but processing costs such as processing equipment, heating, and cost required for chemicals are very expensive. In addition, the method (3) is also expensive in processing.
以上のことから現状では、高炉水砕スラグ細骨材の多くは天然砂と混合して使用され、ブリージング特性が許容範囲内になるようにしている。しかし、このような使用形態では、スラグの配合比率を高めることができないため、スラグの使用量にも限界がある。
したがって本発明の目的は、ブリージング特性が優れた高炉水砕スラグ細骨材を低コストで効率的に製造することができる方法を提供することにある。
From the above, at present, most of the granulated blast furnace slag fine aggregate is used by mixing with natural sand so that the breathing characteristics are within an allowable range. However, in such a usage form, since the blending ratio of slag cannot be increased, there is a limit to the amount of slag used.
Accordingly, an object of the present invention is to provide a method capable of efficiently producing a blast furnace granulated slag fine aggregate having excellent breathing characteristics at low cost.
上記課題を解決するための本発明の要旨は以下のとおりである。
［1］高炉水砕スラグにエージングによる表面改質を施して比表面積を増大させ、比表面積が０．７ｍ２／ｇ以上の高炉水砕スラグ細骨材とすることを特徴とするブリージング特性に優れた高炉水砕スラグ細骨材の製造方法。
［2］上記［1］の製造方法において、高炉水砕スラグを製造後、屋外または屋内にて１ヶ月以上エージングすることを特徴とする高炉水砕スラグ細骨材の製造方法。
The gist of the present invention for solving the above problems is as follows.
[1] Breasting characteristics characterized by blast furnace granulated slag being subjected to surface modification by aging to increase the specific surface area, and to make a blast furnace granulated slag fine aggregate having a specific surface area of 0.7 m 2 / g or more. An excellent method for producing granulated blast furnace slag fine aggregate.
[2] A method for producing a granulated blast furnace slag fine aggregate according to [1], wherein the granulated blast furnace slag is aged outdoors or indoors for at least one month.
本発明によれば、ブリージング特性が優れた高炉水砕スラグ細骨材を低コストで効率的に製造することができる。 According to the present invention, a granulated blast furnace slag fine aggregate excellent in breathing characteristics can be efficiently produced at low cost.
本発明者らは、高炉水砕スラグの比表面積がブリージング特性に大きく影響するとの前提の下で、高炉水砕スラグの比表面積を大きくする表面改質方法について検討を行うとともに、比表面積とブリージング特性との関係について調査した。
高炉水砕スラグの表面改質方法として、下記の方法を試験した。
Under the assumption that the specific surface area of blast furnace granulated slag greatly affects the breathing characteristics, the present inventors have investigated a surface modification method for increasing the specific surface area of blast furnace granulated slag, and The relationship with characteristics was investigated.
The following method was tested as a surface modification method for granulated blast furnace slag.
（1）スラグの結晶化＋蒸気エージングによる表面改質
高炉水砕スラグを１１００℃×４８時間で加熱して結晶化させた後、蒸気エージングを４８時間施した。この表面改質された材料を「細骨材A」とする。
（2）水和反応による表面改質
i）アルカリ処理： 水酸化ナトリウムでｐＨを１２に調整した水に高炉水砕スラグを入れ、水温９０℃で２４時間保持した。この表面改質された材料を「細骨材B」とする。
ii）酸処理： クエン酸でｐＨを２〜３に調整した水に高炉水砕スラグを入れ、水温９０℃で２４時間保持した。この表面改質された材料を「細骨材C」とする。
iii）屋外エージング： 製造後３ヶ月屋外エージングした高炉水砕スラグを用いた。この表面改質された材料を「細骨材D1」とする。
iv）屋外エージング： 製造後３年以上屋外エージングした高炉水砕スラグを用いた。この表面改質された材料を「細骨材D2」とする。
(1) Surface modification by slag crystallization + steam aging Blast furnace granulated slag was crystallized by heating at 1100 ° C. for 48 hours, and then subjected to steam aging for 48 hours. This surface-modified material is referred to as “fine aggregate A”.
(2) Surface modification by hydration reaction
i) Alkali treatment: Blast furnace granulated slag was added to water adjusted to pH 12 with sodium hydroxide and kept at a water temperature of 90 ° C. for 24 hours. This surface-modified material is referred to as “fine aggregate B”.
ii) Acid treatment: Blast furnace granulated slag was added to water adjusted to pH 2 to 3 with citric acid, and kept at a water temperature of 90 ° C. for 24 hours. This surface-modified material is referred to as “fine aggregate C”.
iii) Outdoor aging: Blast furnace granulated slag which was aged for 3 months after production was used. This surface-modified material is referred to as “fine aggregate D1”.
iv) Outdoor aging: Granulated blast furnace slag that has been aged for over 3 years after production was used. This surface-modified material is referred to as “fine aggregate D2.”
各材料の評価では、顕微鏡観察とＳＥＭ観察による表層の生成物調査及び比表面積調査を実施して比表面積が大きいものを抽出し、ブリージング試験を実施した。
まず、比表面積を増大させるのに有効な処理方法について検討を行った。
表面改質前の高炉水砕スラグ、高炉水砕スラグに対してエージング（３年以上屋外エージング）による表面改質を行った細骨材D2、及び天然砂について、顕微鏡観察とＳＥＭ観察により表層の生成物を調査した。その結果を図１に示す。ＳＥＭ観察結果から、エージングによる表面改質を行った細骨材D2は、水和物、炭酸化物と考えられる析出物が多く析出していた。
In the evaluation of each material, a surface layer product investigation and a specific surface area investigation were conducted by microscopic observation and SEM observation, and those having a large specific surface area were extracted, and a breathing test was conducted.
First, a treatment method effective for increasing the specific surface area was examined.
Blast furnace granulated slag before surface modification, fine aggregate D2 that has undergone surface modification by aging (outdoor aging for 3 years or more), and natural sand, surface layer by microscopic observation and SEM observation The product was investigated. The result is shown in FIG. From the results of SEM observation, the fine aggregate D2 subjected to surface modification by aging had a large amount of precipitates considered to be hydrates and carbonates.
各材料について、比表面積の調査を行った結果を図２に示す。比表面積は、未処理の高炉水砕スラグ細骨材（従来材）が０．１０ｍ２／ｇであるのに対し、アルカリ処理を施した細骨材Bで０．７７ｍ２／ｇ、３ヶ月屋外エージング（養生）した細骨材D1で１．２８ｍ２／ｇ、３年以上屋外エージング（養生）した細骨材D2で３．９ｍ２／ｇであり、細骨材D1で未処理の高炉水砕スラグの約１０倍、細骨材D2で未処理の高炉水砕スラグの約４０倍であった。 The result of having investigated the specific surface area about each material is shown in FIG. The specific surface area, whereas the untreated water-granulated blast furnace slag fine aggregate (conventional material) is 0.10m 2 / g, 0.77m 2 / g, 3 months fine aggregate B having been subjected to alkali treatment Outdoor aged (cured) fine aggregate D1 1.28m 2 / g, outdoor aging (cured) fine aggregate D2 3.9m 2 / g, untreated with fine aggregate D1 blast furnace It was about 10 times that of granulated slag and about 40 times that of untreated blast furnace granulated slag.
各材料についてブリージング試験を行い、ブリージング量を求めた。また、モルタルフロー試験を実施した。各材料のブリージング量と比表面積を図３に示す。これによれば、比表面積とブリージング量は非常に良い相関関係が認められる。最も比表面積が大きい３年以上屋外エージング（養生）した細骨材D2は、ブリージング量０．１１ｃｍ３／ｃｍ２であり、これは未処理の水砕スラグ細骨材（従来材）の１／３、目標である天然砂（０．２６ｃｍ３／ｃｍ２）の例の１／２以下である。また、３ヶ月屋外エージング（養生）した細骨材D1は、アルカリ処理を施した細骨材Bよりも、比表面積が大きく、ブリージング特性も優れており、アルカリ処理や、高温での処理を施すことなく、簡便な設備でエージング処理することで、優れたブリージング特性を得ることができる。１ヶ月屋外エージングでアルカリ処理を施した場合と同等以上の性能が得られている。
以上の結果より、ブリージング特性に大きく影響する要因は比表面積であること、比表面積を増大させる方法としてエージング（水和反応）による表面改質が有効であることが判った。
Each material was subjected to a breathing test to determine the amount of breathing. Moreover, the mortar flow test was implemented. The breathing amount and specific surface area of each material are shown in FIG. According to this, a very good correlation is recognized between the specific surface area and the breathing amount. The fine aggregate D2, which has been aged (cured) for 3 years or more with the largest specific surface area, has a breathing amount of 0.11 cm 3 / cm 2 , which is 1/0 of that of untreated granulated slag fine aggregate (conventional material). 3. It is 1/2 or less of the target natural sand (0.26 cm 3 / cm 2 ). Fine aggregate D1, which has been aged (cured) for 3 months, has a larger specific surface area and superior breathing properties than fine aggregate B that has been subjected to alkali treatment, and is subjected to alkali treatment and high temperature treatment. Without performing the aging process with simple equipment, excellent breathing characteristics can be obtained. A performance equal to or better than that obtained when the alkali treatment is performed by outdoor aging for one month is obtained.
From the above results, it was found that the factor that greatly affects the breathing characteristics is the specific surface area, and that surface modification by aging (hydration reaction) is effective as a method for increasing the specific surface area.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015025501A1 (en) * | 2013-08-20 | 2015-02-26 | Ｊｆｅスチール株式会社 | Method for producing solidified slag, solidified slag, method for producing coarse aggregate for concrete, and coarse aggregate for concrete |
| JP2016000918A (en) * | 2014-06-11 | 2016-01-07 | 新日鐵住金株式会社 | Simple pavement material |
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| JPS56160363A (en) * | 1980-05-03 | 1981-12-10 | Chikage Sando Kk | Improvement of concrete properties with blast furnace water-granulated sand |
| JP2004075454A (en) * | 2002-08-16 | 2004-03-11 | Tetsugen Corp | Blast furnace granulated slag fine aggregate and method of preventing caking of blast furnace granulated slag |
| JP2004161580A (en) * | 2002-11-15 | 2004-06-10 | Kokan Kogyo Kk | Method of treating granulated blast furnace slag |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS56160363A (en) * | 1980-05-03 | 1981-12-10 | Chikage Sando Kk | Improvement of concrete properties with blast furnace water-granulated sand |
| JP2004075454A (en) * | 2002-08-16 | 2004-03-11 | Tetsugen Corp | Blast furnace granulated slag fine aggregate and method of preventing caking of blast furnace granulated slag |
| JP2004161580A (en) * | 2002-11-15 | 2004-06-10 | Kokan Kogyo Kk | Method of treating granulated blast furnace slag |
Non-Patent Citations (1)
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| JPN3099003404; 高炉スラグ細骨材を用いるコンクリート施工指針 同解説 Ｍ６Ｄ１５, 1983, Ｐ１５-１０５ * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015025501A1 (en) * | 2013-08-20 | 2015-02-26 | Ｊｆｅスチール株式会社 | Method for producing solidified slag, solidified slag, method for producing coarse aggregate for concrete, and coarse aggregate for concrete |
| CN105452187A (en) * | 2013-08-20 | 2016-03-30 | 杰富意钢铁株式会社 | Method for producing solidified slag, solidified slag, method for producing coarse aggregate for concrete, and coarse aggregate for concrete |
| JPWO2015025501A1 (en) * | 2013-08-20 | 2017-03-02 | Ｊｆｅスチール株式会社 | Method for producing solidified slag and method for producing coarse aggregate for concrete |
| JP2016000918A (en) * | 2014-06-11 | 2016-01-07 | 新日鐵住金株式会社 | Simple pavement material |
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