JPH03137041A - Method for heat treatment of fly ash and low heating and high durability cement - Google Patents
Method for heat treatment of fly ash and low heating and high durability cementInfo
- Publication number
- JPH03137041A JPH03137041A JP1271472A JP27147289A JPH03137041A JP H03137041 A JPH03137041 A JP H03137041A JP 1271472 A JP1271472 A JP 1271472A JP 27147289 A JP27147289 A JP 27147289A JP H03137041 A JPH03137041 A JP H03137041A
- Authority
- JP
- Japan
- Prior art keywords
- fly ash
- cement
- heat treatment
- concrete
- heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000010881 fly ash Substances 0.000 title claims abstract description 42
- 238000010438 heat treatment Methods 0.000 title claims abstract description 24
- 239000004568 cement Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims description 6
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 230000020169 heat generation Effects 0.000 claims description 5
- 238000001035 drying Methods 0.000 abstract description 3
- 239000010883 coal ash Substances 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 6
- 230000009257 reactivity Effects 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000002956 ash Substances 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- 238000001027 hydrothermal synthesis Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 239000012798 spherical particle Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010882 bottom ash Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- MKTRXTLKNXLULX-UHFFFAOYSA-P pentacalcium;dioxido(oxo)silane;hydron;tetrahydrate Chemical compound [H+].[H+].O.O.O.O.[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O MKTRXTLKNXLULX-UHFFFAOYSA-P 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野１
本発明はフライアッシュの加熱処理方法及びこの加熱処
理されたフライアッシュを混入して品質改善した低発熱
・高耐久性セメントに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a method for heat treatment of fly ash and a low heat generation, high durability cement whose quality is improved by incorporating the heat treated fly ash.
［従来の技術］
「石膏と石灰Ｊ Ｎｏ、２１９ｖｏＩ２．３ （１９８
９）に、「フライアッシュと石灰、セラコラとの水熱反
応性 ■、反応性に及ぼす加熱処理の影響Ｊが記載され
ている。その内容は次の通りである。[Prior art] “Gypsum and lime J No. 219voI2.3 (198
9) describes ``Hydrothermal reactivity of fly ash, lime, and Ceracola (1), and the influence of heat treatment on reactivity J.'' The contents are as follows.
フライアッシュを６００℃、１０００℃、１３００℃及
び１６００℃でそれぞれ４時間加熱処理し、フライアッ
シュの鉱物組成の変化が水熱反応性や反応生成物に与え
る影響を明らかにするため、水熱反応後の未反応フライ
アッシュの定量、水熱反応前後における鉱物組成の変化
及び溶出成分について検討した。その結果、１０００℃
以上の温度で加熱処理するとムライト、クリストバライ
トなどの結晶化が進み、１６００℃ではムライトがガラ
ス層に溶解した。結晶化が進むことによって、１８０℃
、２４時間のオートクレーブ反応性が向上し、１１人ト
バモライトの生成が顕著となった。Fly ash was heat treated at 600°C, 1000°C, 1300°C and 1600°C for 4 hours each, and the hydrothermal reaction We investigated the quantitative determination of unreacted fly ash, changes in mineral composition before and after the hydrothermal reaction, and eluted components. As a result, 1000℃
When heat treated at the above temperature, crystallization of mullite, cristobalite, etc. progressed, and at 1600° C., mullite was dissolved in the glass layer. 180℃ due to progress of crystallization
, the 24-hour autoclave reactivity was improved, and the formation of 11-person tobermorite became remarkable.
［発明が解決しようとする課題］
上記研究ではフライアッシュに結晶が析出することによ
り、ガラスの組成が変わるため水熱反応性が向上するこ
とを記述している。[Problems to be Solved by the Invention] The above research describes that precipitation of crystals in fly ash changes the composition of the glass, thereby improving hydrothermal reactivity.
しかしながらこれを達成するためには、６００℃以上の
高温で４時間もの長時間の加熱処理が必要となり、現実
的でない。However, in order to achieve this, heat treatment for as long as 4 hours at a high temperature of 600° C. or higher is required, which is not practical.
本発明では、以上述べた長時間の加熱処理という非実際
的な問題を除去した、経済的で効果の大きなフライアッ
シュの改質方法を提供することを目的とする。また、こ
のような改質されたフライアッシュを含む低発熱で耐久
性の高いセメントを提供することを目的とする。An object of the present invention is to provide an economical and highly effective method for modifying fly ash that eliminates the impractical problem of long-time heat treatment described above. Another object of the present invention is to provide a low heat generation and highly durable cement containing such modified fly ash.
［課題を解決するための手段］
本発明は、フライアッシュを３００℃〜９００℃の温度
で、３０秒間〜３０分間加熱処理し、次いで１５０℃ま
で２０℃／分以上の冷却速度で冷却することを特徴とす
るフライアッシュの加熱処理方法である。[Means for Solving the Problems] The present invention involves heat treating fly ash at a temperature of 300°C to 900°C for 30 seconds to 30 minutes, and then cooling it to 150°C at a cooling rate of 20°C/min or more. This is a fly ash heat treatment method characterized by the following.
また本発明はこの加熱処理により改質されたフライアッ
シュを含むことを特徴とする低発熱・高耐久性セメント
である。Furthermore, the present invention is a low heat generation and highly durable cement characterized by containing fly ash modified by this heat treatment.
なお、ここでいうフライアッシュはガラス質の石炭灰を
意味し、フライアッシュセメントに使用している球状粒
子以外のもの、例λばボトムアッシュ、篩炭器灰、予熱
器状、クリンカーアッシュなども含む。Note that fly ash here refers to glassy coal ash, and may also include particles other than the spherical particles used in fly ash cement, such as bottom ash, sieve ash, preheater ash, clinker ash, etc. include.
［作用〕
本発明はセメント等の原料として使用できるフライアッ
シュの加熱処理方法及びその加熱したフライアッシュを
使用した低発熱・高耐久性セメントに関するものである
。[Function] The present invention relates to a method for heating fly ash that can be used as a raw material for cement and the like, and to a low heat generation and highly durable cement using the heated fly ash.
フライアッシュは上記加熱条件で加熱処理することによ
り性状が活性化され、これを混入したセメントは、未処
理のフライアッシュを同量混入したセメントより強さの
発現性が改善される。特に材令２８日以後の強さの伸び
が太き（なるので、フライアッシュの混入量を増加する
ことができる。その結果、フレッシュコンクリートの作
業性改善、硬化コンクリートの断熱温度上昇量の減少、
水密性、各種有害イオンの浸透性、乾燥収縮性状などの
改善を期待することができる。The properties of fly ash are activated by heat treatment under the above heating conditions, and cement mixed with fly ash has improved strength development than cement mixed with the same amount of untreated fly ash. In particular, the strength increases after 28 days, so the amount of fly ash mixed can be increased.As a result, the workability of fresh concrete is improved, the amount of adiabatic temperature rise of hardened concrete is reduced,
Improvements in watertightness, permeability to various harmful ions, drying shrinkage properties, etc. can be expected.
ただし、球状粒子の少ないフライアッシュを使用した場
合には、作業性改善効果は大して期待できない。However, when fly ash containing few spherical particles is used, no significant improvement in workability can be expected.
フライアッシュの加熱処理条件は３００”０〜９００℃
で３０秒〜３０分である。Heat treatment conditions for fly ash are 300” 0 to 900℃
The time is 30 seconds to 30 minutes.
フライアッシュの加熱温度が３ｏｏ℃未満ではフライア
ッシュの性状に変化がなく、９００℃を越えるとフライ
アッシュヵ貸容融してガラス質を失うので活性の上昇が
期待できない。望ましい加熱処理条件は、４００ ’Ｃ
〜８００’Ｃの温度で５分間以下の加熱である。その結
果、ガラス構造に変化が生じ、水和反応性（常温のみな
らず高温高圧下でも）が向上する。６００”Ｃ以上の温
度で加熱するとカーボンが燃焼するため、そのフライア
ッシュを含むセメントにＡＥ減水剤を用いたフレッシュ
コンクリートの作業性は更に良好となる。If the heating temperature of the fly ash is less than 30° C., there will be no change in the properties of the fly ash, and if it exceeds 900° C., the fly ash will melt and lose its glassy properties, so no increase in activity can be expected. Desirable heat treatment conditions are 400'C
Heating at a temperature of ~800'C for no more than 5 minutes. As a result, a change occurs in the glass structure, and the hydration reactivity (not only at room temperature but also under high temperature and high pressure) is improved. Since carbon burns when heated at a temperature of 600''C or higher, the workability of fresh concrete using an AE water reducing agent in cement containing fly ash becomes even better.
処理時間は高温側では３０秒で効果が生じこれより短時
間では効果が上がらない。一方、比較的低温（３００℃
近傍）でも３０分間加熱処理をすれば初期の性状改善が
できる。As for the treatment time, on the high temperature side, the effect is produced in 30 seconds, and the effect is not improved if the treatment time is shorter than 30 seconds. On the other hand, relatively low temperature (300℃
Even in the vicinity), initial properties can be improved by heat treatment for 30 minutes.
第１表に、５００℃における処理時間と圧縮強さ及び水
和熱の試験結果を示した。３０分を越える領域ではほと
んど効果が飽和し、不経済である。Table 1 shows the treatment time, compressive strength, and heat of hydration test results at 500°C. In a region exceeding 30 minutes, the effect is almost saturated and it is uneconomical.
冷却速度は２０℃／分を越えるとガラス構造の秩序化及
び結晶化が進行するため、加熱効果が少な（なる。If the cooling rate exceeds 20° C./min, ordering and crystallization of the glass structure will proceed, resulting in less heating effect.
第２表に７５０℃、３分間加熱処理における冷却速度と
圧縮強さ試験結果を示した。２０℃／分を越えると、強
さ上昇率が大幅に減少する。Table 2 shows the cooling rate and compressive strength test results in heat treatment at 750°C for 3 minutes. Above 20°C/min, the rate of increase in strength decreases significantly.
以上のような加熱処理したセメントは、マスコンクリー
トの他に、高耐久性を要求されるコンクリートに好適に
用いることができる。The heat-treated cement as described above can be suitably used for concrete requiring high durability, in addition to mass concrete.
このセメントには高炉水滓、シリカヒユーム、石灰石等
の混合材が共存しても構わない。This cement may contain mixed materials such as blast furnace water slag, silica hume, and limestone.
本発明の製造方法によれば、フライアッシュをセメント
工場内の流動炉で大量に処理することができるので実際
的である。According to the manufacturing method of the present invention, fly ash can be processed in large quantities in a fluidized furnace in a cement factory, which is practical.
［実施例］
加熱用及び冷却用の２段の流動層を有する流動炉により
、５００℃及び７５０℃の各温度で３分間あるいは１０
分間加熱し、１５０℃まで５０℃／分の冷却速度で冷却
し、その後室温まで徐冷却した。[Example] A fluidized furnace having two stages of fluidized beds for heating and cooling was used for 3 minutes or 10 minutes at each temperature of 500°C and 750°C.
The mixture was heated for 1 minute, cooled to 150°C at a cooling rate of 50°C/min, and then slowly cooled to room temperature.
この加熱処理後冷却したフライアッシュを普通ポルトラ
ンドセメント（三菱鉱業セメント株式会社製）に内削で
１６重量％混合してフライアッシュセメント（Ｂ種）を
製造した。This heat-treated and cooled fly ash was mixed with ordinary Portland cement (manufactured by Mitsubishi Mining Cement Co., Ltd.) in an amount of 16% by weight to produce fly ash cement (Type B).
このセメントについて、ＪＩＳＲ５２０１に従い圧縮強
さ試験を、また、同じ＜ＪＩＳＲ５２０３に従い水和熱
試験を材令９１日までについて行った。その試験結果を
第３表に示す。This cement was subjected to a compressive strength test in accordance with JISR5201 and a heat of hydration test in accordance with JISR5203 up to 91 days old. The test results are shown in Table 3.
実施例のセメントは未処理のフライアッシュセメントに
比し、水和熱はほぼ同等で圧縮強さは向上しており、５
００〜７５０℃で３分程度の加熱処理をしたフライアッ
シュを用いた場合、圧縮強さは約１０％上昇している。The cement of the example has almost the same heat of hydration and improved compressive strength compared to untreated fly ash cement.
When fly ash heat-treated at 00 to 750°C for about 3 minutes is used, the compressive strength increases by about 10%.
［発明の効果］
本発明によれば、短時間の簡易な処理により、フライア
ッシュの性状を改善することができ、このフライアッシ
ュを混入したセメントは低発熱量でこれを用いたコンク
リートは長期材令強度が高く、乾燥収縮が少なくマスコ
ンクリート、水密コンクリートなどに好適に使用するこ
とができる。[Effects of the Invention] According to the present invention, the properties of fly ash can be improved by simple treatment in a short time, and cement mixed with this fly ash has a low calorific value, and concrete using it has a long-term material. It has high mechanical strength and low drying shrinkage, making it suitable for use in mass concrete, watertight concrete, etc.
出 願 人 三菱鉱業セメント株式会社代 理 人
弁理士 小 杉 佳 男手続補正書
平成２年２月１３日Applicant Mitsubishi Mining Cement Co., Ltd. Agent
Patent Attorney Yoshi Kosugi Procedural Amendment February 13, 1990
Claims (1)
０秒間〜３０分間加熱処理し、 次いで１５０℃まで２０℃／分以上の冷却速度で冷却す
ることを特徴とするフライアッ シュの加熱処理方法。 ２ 請求項１記載の加熱処理されたフライアッシュを含
むことを特徴とする低発熱・高耐久性セメント。[Claims] 1. Fly ash at a temperature of 300°C to 900°C, 3.
A method for heat treatment of fly ash, which comprises heating for 0 seconds to 30 minutes, and then cooling to 150°C at a cooling rate of 20°C/min or more. 2. A low heat generation and high durability cement comprising the heat-treated fly ash according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1271472A JP2616053B2 (en) | 1989-10-20 | 1989-10-20 | Heat treatment method of fly ash and low heat and high durability cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1271472A JP2616053B2 (en) | 1989-10-20 | 1989-10-20 | Heat treatment method of fly ash and low heat and high durability cement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03137041A true JPH03137041A (en) | 1991-06-11 |
| JP2616053B2 JP2616053B2 (en) | 1997-06-04 |
Family
ID=17500512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1271472A Expired - Fee Related JP2616053B2 (en) | 1989-10-20 | 1989-10-20 | Heat treatment method of fly ash and low heat and high durability cement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2616053B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH074632A (en) * | 1993-06-19 | 1995-01-10 | Shiden Sangyo Kk | Modifying method for fly ash |
| WO1995007864A1 (en) * | 1993-09-15 | 1995-03-23 | Melania Savos | Raw materials for glass and ceramics manufacture as well as a process for producing them |
| CN114702270A (en) * | 2022-04-19 | 2022-07-05 | 石家庄金隅混凝土有限公司 | Method for preparing concrete by using concrete wastewater |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2456251C1 (en) * | 2011-02-25 | 2012-07-20 | Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" | Method of activating binding properties of mineral industrial products |
-
1989
- 1989-10-20 JP JP1271472A patent/JP2616053B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH074632A (en) * | 1993-06-19 | 1995-01-10 | Shiden Sangyo Kk | Modifying method for fly ash |
| JPH0812002B2 (en) * | 1993-06-19 | 1996-02-07 | 四電産業株式会社 | Fly ash modification method |
| WO1995007864A1 (en) * | 1993-09-15 | 1995-03-23 | Melania Savos | Raw materials for glass and ceramics manufacture as well as a process for producing them |
| CN114702270A (en) * | 2022-04-19 | 2022-07-05 | 石家庄金隅混凝土有限公司 | Method for preparing concrete by using concrete wastewater |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2616053B2 (en) | 1997-06-04 |
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