JPS6216714B2 - - Google Patents
Info
- Publication number
- JPS6216714B2 JPS6216714B2 JP21268482A JP21268482A JPS6216714B2 JP S6216714 B2 JPS6216714 B2 JP S6216714B2 JP 21268482 A JP21268482 A JP 21268482A JP 21268482 A JP21268482 A JP 21268482A JP S6216714 B2 JPS6216714 B2 JP S6216714B2
- Authority
- JP
- Japan
- Prior art keywords
- parts
- cement
- weight
- coal ash
- added
- 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.)
- Expired
Links
- 239000004568 cement Substances 0.000 claims description 30
- 239000010883 coal ash Substances 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 17
- 229910017053 inorganic salt Inorganic materials 0.000 claims description 5
- 229910001508 alkali metal halide Inorganic materials 0.000 claims description 3
- 150000008045 alkali metal halides Chemical class 0.000 claims description 3
- 229910001615 alkaline earth metal halide Inorganic materials 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 description 14
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- 239000011398 Portland cement Substances 0.000 description 9
- 239000002956 ash Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 230000032683 aging Effects 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- OTCKOJUMXQWKQG-UHFFFAOYSA-L magnesium bromide Chemical compound [Mg+2].[Br-].[Br-] OTCKOJUMXQWKQG-UHFFFAOYSA-L 0.000 description 1
- 229910001623 magnesium bromide Inorganic materials 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000011698 potassium fluoride Substances 0.000 description 1
- 235000003270 potassium fluoride Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010802 sludge 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
- 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
Landscapes
- Processing Of Solid Wastes (AREA)
Description
本発明は石炭灰硬化用混和剤組成物、更に詳細
にはセメントと無機塩類とを含有する石炭灰硬化
用混和剤組成物に関する。
近年、石油価格の高騰から火力発電の燃料とし
て石炭が注目され、石油火力発電から石炭火力発
電へと急激な変換が計画されつつある。しかし、
石炭を燃焼すると石炭重量の約20％の石炭灰が発
生し、現在でも年間約200万トンもの石炭灰が発
生し、今後は更に急増すると言われている。この
ような背景のもとで、石炭灰の有効利用が各方面
で研究されている。かような試みの一つとして石
炭灰にセメント及びセツコウを配合して硬化体と
する提案がなされているが、かような硬化体はセ
メントの他にセツコウを添加するため高価とな
り、且つ配合が複雑で安定した性質が得にくいの
で実用上好ましくないという欠点を有する。
本発明は、安定した性質が得易くしかも安価な
石炭灰硬化用混和剤組成物を提供することを目的
とする。
本発明によれば、アルカリ金属ハロゲン化物
類、アルカリ土類金属ハロゲン化物類及びこれら
の混合物から選択される無機塩類とセメントとを
含む混和剤であつて、石炭灰100重量部に対して
セメント３〜150重量部、石炭灰とセメントとの
混合物100重量部に対して無機塩類0.1〜５重量部
（乾燥基準）を含有することからなる石炭灰硬化
用混和剤組成物が提供される。
以下、本発明を更に詳細に説明する。
本発明において使用し得る石炭灰としてはその
組成は産地によりかなり差があるが、微粉炭燃焼
により発生したものを電気集塵機で集めた、いわ
ゆるEP灰、あるいはこれを粗粒化した既成灰な
どを挙げることができる。これらのうち、EP灰
が、含水量が一定していること、取扱い易いなど
の理由で好ましい。
本発明では上記石炭灰にセメントを添加する。
使用し得るセメントとしては普通ポルトランドセ
メント、早強ポルトランドセメント、超早強ポル
トランドセメント、中庸熱ポルトランドセメント
等の各種ポルトランドセメント；アルミナセメン
ト、石灰アルミナセメント等のアルミナセメン
ト；高炉スラグ混合セメント、ポゾラン混合セメ
ント、フライアツシユセメント等の各種混合セメ
ントを挙げることができる。これらのうち、ポル
トランドセメント、特に普通ポルトランドセメン
トが一般的であり好ましく使用できる。本発明で
は上記セメントを石炭灰100重量部に対し、３〜
150重量部、好ましくは５〜60重量部添加する。
セメントの添加量が３重量部未満では強度が発現
せず、また150重量部を越えて添加しても強度発
現がさほど上昇しない。
本発明の石炭灰硬化用混和剤組成物では無機塩
類を添加することを特徴とする。本発明にて使用
し得る無機塩類は塩化ナトリウム、臭化ナトリウ
ム、塩化カリウム、フツ化カリウムなどのアルカ
リ金属ハロゲン化物類；塩化カルシウム、塩化マ
グネシウム、臭化マグネシウムなどのアルカリ土
類金属ハロゲン化物類；並びにこれらの混合物で
ある。これらの無機塩類は粉末若しくは水溶液に
て混和剤とすることができ、後者の場合特に濃度
は臨界的ではないが通常１〜20重量％程度の水溶
液として用いる。
無機塩類の添加量は石炭灰とセメントとの混合
物100重量部に対し0.1〜５重量部（乾燥基準）、
好ましくは１〜2.5重量部（乾燥基準）とする。
添加量が0.1重量部未満では強度が発現せず、ま
た一方５重量部を越えると添加量を増しても強度
増加が見られなくなる。
本発明において石炭灰とセメントとの混合物に
対し、上述の範囲で無機塩類を添加すると強度、
特に圧縮強度が著しく増大し、短期材令後の強度
ばかりでなく、長期材令後の強度が著しく増大す
る。従来よりセメントに対し無機塩類を約２重量
％以上添加すると長期材令後の圧縮強度が低下す
ることが知られており、セメントに対する無機塩
類の添加は２重量％程度までに制限されていた。
これに対し、本発明による混和剤組成物において
石炭灰に混合添加すると上述の範囲において無機
塩類を加えてもかえつて長期材令後の圧縮強度が
増大することは驚ろくべきことである。
本発明の石炭灰硬化用混和剤組成物は水を石炭
灰とセメントとの混合物100重量部に対して15〜
50重量部、好ましくは25〜40重量部にて混練、成
形するだけで強度の高い硬化体を得ることがで
き、建材、土木材等として利用できる。
以下本発明につき実施例を挙げて説明する。な
お、「％」及び「部」は各々「重量％」及び「重
量部」を示す。
実施例 １
石炭灰として磯子火力発電所EP灰100部を用
い、セメントと無機塩類とからなる混和剤を加え
た。混和剤はEP灰に対して普通ポルトランドセ
メント15部と、EP灰と普通ポルトランドセメン
トとの合計量100部に対して無機塩類としてNaCl
１部（乾燥基準）とを含むようにした。混和剤を
添加後、強制練りミキサーを用いて混合し、石炭
灰とセメントとの合計量100部に対し、水30部を
加えて十分混練して供試体（φ10×20cm）を作成
した。得られた供試体につきJISA1108に従つて
７日、28日、91日材令後の圧縮強度を測定した。
その結果、圧縮強度は各々120Kg／cm2、198Kg／
cm2、267Kg／cm2であつた。
比較例 １
無機塩類を添加しない以外は実施例１と同様に
して供試体を作成した。材令７日、28日、91日の
圧縮強度は各々55Kg／cm2、70Kg／cm2、110Kg／cm2
であつた。
実施例 ２〜12、比較例 ２
実施例１について無機塩類の添加量を変えた場
合及び他の無機塩を用いた場合について実施例１
と同様の手法にて実験を行つた。結果を表１に示
す。なお、実施例１及び比較例１を併せて記載す
る。
The present invention relates to an admixture composition for curing coal ash, and more particularly to an admixture composition for curing coal ash containing cement and inorganic salts. In recent years, coal has attracted attention as a fuel for thermal power generation due to soaring oil prices, and plans are being made to rapidly convert oil-fired power generation to coal-fired power generation. but,
When coal is burned, coal ash is generated, which accounts for approximately 20% of the weight of the coal.Currently, approximately 2 million tons of coal ash is generated annually, and it is said that this amount will increase even more in the future. Against this background, research on the effective use of coal ash is being conducted in various fields. One such attempt has been made to create a hardened material by blending cement and slag with coal ash, but such a hardened material is expensive and difficult to mix as it requires the addition of sludge in addition to cement. It has the drawback that it is difficult to obtain complex and stable properties, so it is not preferred in practice. An object of the present invention is to provide an admixture composition for curing coal ash that is easy to obtain stable properties and is inexpensive. According to the present invention, there is provided an admixture containing cement and an inorganic salt selected from alkali metal halides, alkaline earth metal halides, and mixtures thereof, wherein 3 parts by weight of cement is used per 100 parts by weight of coal ash. There is provided an admixture composition for curing coal ash, comprising 0.1 to 5 parts by weight (on a dry basis) of an inorganic salt per 100 parts by weight of a mixture of coal ash and cement. The present invention will be explained in more detail below. The composition of the coal ash that can be used in the present invention varies considerably depending on the production area, but so-called EP ash, which is generated by pulverized coal combustion and collected using an electrostatic precipitator, or pre-formed ash, which is coarse-grained ash, can be used. can be mentioned. Among these, EP ash is preferred because it has a constant moisture content and is easy to handle. In the present invention, cement is added to the coal ash.
Cement that can be used include various types of Portland cement such as ordinary Portland cement, early strength Portland cement, ultra early strength Portland cement, and moderate heat Portland cement; alumina cement such as alumina cement and lime alumina cement; blast furnace slag mixed cement, and pozzolan mixed cement. Various mixed cements such as fly ash cement and the like can be mentioned. Among these, Portland cement, especially ordinary Portland cement, is common and can be preferably used. In the present invention, the above cement is added to 100 parts by weight of coal ash in 3 to 3 parts by weight.
Add 150 parts by weight, preferably 5 to 60 parts by weight.
If the amount of cement added is less than 3 parts by weight, no strength will be developed, and if it is added in excess of 150 parts by weight, the strength will not be developed significantly. The coal ash curing admixture composition of the present invention is characterized by the addition of inorganic salts. Inorganic salts that can be used in the present invention include alkali metal halides such as sodium chloride, sodium bromide, potassium chloride, and potassium fluoride; alkaline earth metal halides such as calcium chloride, magnesium chloride, and magnesium bromide; and mixtures thereof. These inorganic salts can be used as an admixture in the form of powder or aqueous solution, and in the latter case, the concentration is not particularly critical, but it is usually used as an aqueous solution of about 1 to 20% by weight. The amount of inorganic salts added is 0.1 to 5 parts by weight (dry basis) per 100 parts by weight of the mixture of coal ash and cement.
Preferably it is 1 to 2.5 parts by weight (on a dry basis).
If the amount added is less than 0.1 part by weight, no strength will be developed, while if it exceeds 5 parts by weight, no increase in strength will be observed even if the amount added is increased. In the present invention, adding inorganic salts in the above range to the mixture of coal ash and cement increases the strength.
In particular, the compressive strength increases significantly, and not only the strength after short-term aging but also the strength after long-term aging increases significantly. It has been known that adding more than about 2% by weight of inorganic salts to cement reduces the compressive strength after long-term aging, and the addition of inorganic salts to cement has been limited to about 2% by weight.
On the other hand, it is surprising that when the admixture composition according to the present invention is mixed and added to coal ash, the compressive strength after long-term aging increases even if inorganic salts are added within the above-mentioned range. The admixture composition for curing coal ash of the present invention contains water in an amount of 15 to 100 parts by weight per 100 parts by weight of a mixture of coal ash and cement.
By simply kneading and molding 50 parts by weight, preferably 25 to 40 parts by weight, a cured product with high strength can be obtained and can be used as building materials, civil engineering materials, etc. The present invention will be described below with reference to Examples. Note that "%" and "parts" indicate "% by weight" and "parts by weight", respectively. Example 1 100 parts of Isogo Thermal Power Station EP ash was used as coal ash, and an admixture consisting of cement and inorganic salts was added. The admixture is 15 parts of ordinary Portland cement for EP ash, and NaCl as an inorganic salt for 100 parts of the total amount of EP ash and ordinary Portland cement.
1 part (dry basis). After adding the admixture, it was mixed using a forced mixing mixer, and 30 parts of water was added to a total of 100 parts of coal ash and cement, and thoroughly kneaded to prepare a specimen (φ10 x 20 cm). The compressive strength of the obtained specimens after aging for 7 days, 28 days, and 91 days was measured according to JISA1108.
As a result, the compressive strength was 120Kg/cm 2 and 198Kg/cm 2 respectively.
cm 2 , 267Kg/cm 2 . Comparative Example 1 A specimen was prepared in the same manner as in Example 1 except that no inorganic salts were added. Compressive strength at 7 days, 28 days, and 91 days is 55Kg/cm 2 , 70Kg/cm 2 , and 110Kg/cm 2 , respectively.
It was hot. Examples 2 to 12, Comparative Example 2 Example 1 in which the amount of added inorganic salts was changed in Example 1 and in which other inorganic salts were used
Experiments were conducted using the same method. The results are shown in Table 1. Note that Example 1 and Comparative Example 1 will also be described.
【表】【table】
【表】
上記より明らかなように、NaCl0.05部添加の
場合（比較例２）に比し、NaCl 0.2部添加した
場合（実施例２）には材令28日以後特に強度の増
加が明瞭となり、2.5部添加の場合（実施例６）
に到るまで強度は増加するがそれ以上添加しても
強度は徐々に下降することが判る（実施例７、
８）。NaCl以外の無機塩類でも良好な結果が得ら
れる（実施例９〜12）。
実施例 13〜19、比較例 ３
実施例１についてセメントの添加量を変えた場
合及び他のセメントを用いた場合について実施例
１と同様の手法にて実験を行つた。結果を表２に
示す。なお、実施例１の場合も併せて記載する。[Table] As is clear from the above, compared to the case where 0.05 part of NaCl was added (Comparative Example 2), when 0.2 part of NaCl was added (Example 2), the strength increased especially after 28 days of age. In the case of adding 2.5 parts (Example 6)
It can be seen that the strength increases until it reaches , but even if it is added beyond that, the strength gradually decreases (Example 7,
8). Good results are also obtained with inorganic salts other than NaCl (Examples 9 to 12). Examples 13 to 19, Comparative Example 3 Experiments were conducted in the same manner as in Example 1, except for cases in which the amount of cement added was changed and other cements were used. The results are shown in Table 2. Note that the case of Example 1 will also be described.
【表】【table】
【表】
以上より明らかなように、セメント１部添加の
場合（比較例３）では強度発現はほとんどみられ
ないが、３部以上150部までは強度が徐々に増大
する（実施例13〜17、１）。60部添加の場合（実
施例17）と150部添加の場合（実施例18）とを比
較すると、添加量の増大する割に強度が伸びず、
150部以上添加しても効果がないことが判る。[Table] As is clear from the above, when 1 part of cement is added (Comparative Example 3), almost no strength development is observed, but the strength gradually increases from 3 parts to 150 parts (Examples 13 to 17). , 1). Comparing the case of adding 60 parts (Example 17) and the case of adding 150 parts (Example 18), the strength did not increase as the amount added increased.
It can be seen that there is no effect even if 150 parts or more is added.
Claims (1)
金属ハロゲン化物類及びこれらの混合物から選択
される無機塩類とセメントとを含む混和剤であつ
て、石炭灰100重量部に対してセメント３〜150重
量部、石炭灰とセメントとの混合物100重量部に
対して無機塩類0.1〜５重量部（乾燥基準）を含
有することからなる石炭灰硬化用混和剤組成物。1. An admixture containing cement and an inorganic salt selected from alkali metal halides, alkaline earth metal halides, and mixtures thereof, and 3 to 150 parts by weight of cement per 100 parts by weight of coal ash; An admixture composition for curing coal ash, which contains 0.1 to 5 parts by weight (on a dry basis) of an inorganic salt per 100 parts by weight of a mixture of coal ash and cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57212684A JPS59102490A (en) | 1982-12-06 | 1982-12-06 | Mixing composition for hardening of coal ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57212684A JPS59102490A (en) | 1982-12-06 | 1982-12-06 | Mixing composition for hardening of coal ash |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59102490A JPS59102490A (en) | 1984-06-13 |
| JPS6216714B2 true JPS6216714B2 (en) | 1987-04-14 |
Family
ID=16626699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57212684A Granted JPS59102490A (en) | 1982-12-06 | 1982-12-06 | Mixing composition for hardening of coal ash |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59102490A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2736349B1 (en) * | 1995-07-07 | 1997-09-05 | Electricite De France | CONCRETE, MORTARS AND SLURRY SALT BASED ON SALT AND THEIR PREPARATION PROCESS |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52109482A (en) * | 1976-03-11 | 1977-09-13 | Oshita Naojirou | Stabilization of ashes |
-
1982
- 1982-12-06 JP JP57212684A patent/JPS59102490A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52109482A (en) * | 1976-03-11 | 1977-09-13 | Oshita Naojirou | Stabilization of ashes |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59102490A (en) | 1984-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4392765B2 (en) | Cement additive and cement composition | |
| JP6137850B2 (en) | Hydraulic composition | |
| JP3608911B2 (en) | Hydraulic composition and mortar or concrete using the same | |
| JP3099166B2 (en) | Hydraulic composition | |
| JPH0337145A (en) | Quick setting agent for cement | |
| KR101937772B1 (en) | Eco-friendly composition for high performance concrete using alkali activator | |
| JP2009227549A (en) | Cement additive and cement composition | |
| JPH04228462A (en) | Masonry cement additive agent | |
| JP2716758B2 (en) | Cement admixture | |
| JPS6216714B2 (en) | ||
| JPH01298050A (en) | Flash setting agent for cement | |
| WO1993016965A1 (en) | Geopolymeric binder material | |
| JPS62260753A (en) | Neutral consolidating agent and manufacture | |
| JPH02133358A (en) | Hydraulic composition | |
| GB2188923A (en) | High alumina cement composition | |
| GB2020267A (en) | Cement Composition | |
| JP2503235B2 (en) | Curing accelerator | |
| JP3710851B2 (en) | Hydraulic substance and method for producing the same | |
| WO2023204116A1 (en) | Geopolymer composition and method for producing same | |
| KR890001995B1 (en) | Methods for producing the construction materials using abriquct ash | |
| JPH0526744B2 (en) | ||
| JPS6041628B2 (en) | Method for producing quick-hardening mixed cement | |
| SU1010034A1 (en) | Raw mix for making gas gypsum | |
| JPH0811698B2 (en) | Method for producing thermosetting cement | |
| SU1293142A1 (en) | Binder for concrete mix and mortar |