JPH01224283A - Production of inorganic cured form - Google Patents
Production of inorganic cured formInfo
- Publication number
- JPH01224283A JPH01224283A JP63050368A JP5036888A JPH01224283A JP H01224283 A JPH01224283 A JP H01224283A JP 63050368 A JP63050368 A JP 63050368A JP 5036888 A JP5036888 A JP 5036888A JP H01224283 A JPH01224283 A JP H01224283A
- Authority
- JP
- Japan
- Prior art keywords
- autoclave
- curing
- gas
- atmosphere
- cured
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000012545 processing Methods 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000001723 curing Methods 0.000 description 28
- 239000004566 building material Substances 0.000 description 17
- 239000004568 cement Substances 0.000 description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 238000006253 efflorescence Methods 0.000 description 5
- 206010037844 rash Diseases 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000001027 hydrothermal synthesis Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000011074 autoclave method Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 231100000676 disease causative agent Toxicity 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000010257 thawing Methods 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
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Landscapes
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【発明の詳細な説明】
（発明の利用分野）
本発明は建材などに使用される無機硬化体の製造方法に
関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a method for producing an inorganic cured body used for building materials and the like.
（従来の技術）
建築材料のうち、石灰およびセメント等の石灰質原料と
バインダーとして珪砂、珪石等の硅酸質原料と混合した
ものが、多々製造されているが、それはその製造方法等
が比較的簡便であり、且つその製品が不燃性建材として
、種々の良好な特性を有しているからである（以下のよ
うな建材をセメント系建材と称する。）。(Prior art) Among building materials, many are manufactured by mixing calcareous raw materials such as lime and cement with silica raw materials such as silica sand and silica stone as binders, but the manufacturing method etc. is relatively difficult. This is because it is simple and the product has various good properties as a noncombustible building material (the following building materials are referred to as cement-based building materials).
このようなセメント系建材の製造法として、例えば特開
昭５７−１９６７５４号公報に示されるように高温高圧
水蒸気養生（以下オークレープ養生と称す）するものが
ある。As a manufacturing method for such cement-based building materials, there is a method of high-temperature, high-pressure steam curing (hereinafter referred to as oak crepe curing), as disclosed in, for example, Japanese Patent Application Laid-Open No. 57-196754.
（発明の解決しようとする課題）
しかしこのようなセメント系建材もその用途が高級化す
るにつれて、その欠点が目立ちっつある、即ち軽量化し
た場合の強度不足、或いはその補強材としてガラス繊維
を使用した場合のガラス腐食、或いは経時した場合の白
華現象、或は寒冷地での凍結融解等がその欠点の例とし
て挙げられる。そうしたことから、このセメント系建材
の欠点を補うべく、各人、各社がかなりの努力をしてき
た。その一つの方向がセメント系建材から焼成建材への
転換がある。なるほど、焼成建材は上記セメント系建材
の欠点を補う点が多いが、その反面、焼成工程を経る為
に技術的、或いはコスト的な壁にぶつかり、必ずしもセ
メント系建材を凌駕するまでには至っていない。一方セ
メント系建材の分野でも、上記欠点を改善する施策も検
討されている。本発明はこれらの施策の一つに数えられ
るべきもので、養生方法を改善により、養生時間の短縮
、発現強度の上昇、或は硬化体の緻密化（耐吸水性）等
を図るものである。(Problem to be solved by the invention) However, as the use of such cement-based building materials becomes more sophisticated, their shortcomings are becoming more noticeable, such as insufficient strength when lightweight, or the need to use glass fiber as a reinforcing material. Examples of disadvantages include glass corrosion during use, efflorescence over time, and freezing and thawing in cold regions. For this reason, various people and companies have made considerable efforts to compensate for the shortcomings of this cement-based building material. One direction is the shift from cement-based building materials to fired building materials. It is true that fired building materials compensate for many of the drawbacks of cement-based building materials, but on the other hand, they have not necessarily surpassed cement-based building materials because they run into technical and cost barriers due to the firing process. . On the other hand, measures to improve the above-mentioned drawbacks are also being considered in the field of cement-based building materials. The present invention should be counted as one of these measures, and aims to shorten the curing time, increase the developed strength, or make the hardened material denser (water absorption resistance) by improving the curing method. .
（課題を解決するための手段・作用）
本発明は、粉末状の硅酸質原料と石灰質原料を主原料と
し、これを成形後、ＣＯ□含有ガス雰囲気中でオートク
レーブ養生し、硬化させることを要旨とし、更にオート
クレーブ養生に際しては、処理容器内雰囲気を予めＣＯ
２含有ガスで置換した後オートクレーブ養生する。又処
理容器内において、オートクレーブ養生後、その冷却時
にＣＯ２含有ガスを吹込んで養生する。オートクレーブ
養生後、処理容器内雰囲気をＣＯ２含有ガスで置換して
再度オートクレーブ養生するいずれかの方法によって行
うことを特徴とした無機硬化体の製造方法である。(Means and effects for solving the problem) The present invention uses powdered silica raw materials and calcareous raw materials as main raw materials, and after molding, autoclave curing in a CO□-containing gas atmosphere to harden them. In addition, during autoclave curing, the atmosphere inside the processing container should be adjusted to CO2 in advance.
After purging with gas containing 2, autoclave curing. Further, in the processing container, after curing in an autoclave, CO2-containing gas is blown into the processing container during cooling. This method of producing an inorganic cured product is characterized in that after curing in an autoclave, the atmosphere inside the processing container is replaced with a CO2-containing gas and curing is carried out again in an autoclave.
一般にセメント、或いはセメント以外の珪酸カルシウム
は、水との共存下がＣＯ２と接触すると以下の反応が起
こるとされている。Generally, when cement or calcium silicate other than cement comes into contact with CO2 in the coexistence of water, it is said that the following reaction occurs.
ＣａＯ−３ｉＯ，＋）１２０＋ｃｏ、 ｍｃａｃｏ、＋
ＳｉＯ□・ｎＨ，０この反応により生成される（：ａＣ
Ｏ８，及び５ｉｎ２・ｎ）１．０はバインダーたり得る
ものであり、それが生成されることにより、セメントの
場合と同様な強度発現を呈する。又上記反応の速度はセ
メント水和反応、或いは水熱反応と比較して圧倒的に大
きく、従って所定の強度を得るための養生時間は通常法
と比較して短くすることができる。しかしこのＣＯ，ガ
ス処理による強度発現方法の欠点は、その養生されるべ
き成型物の寸法、特に厚みが厚くなるにつれて、その成
型物の内部までＣＯ２ガスが拡散していくのに時間がか
かったり、或いは成型物表面に緻密なＣａＣＯ５被膜が
生成されて、ガスの内部拡散が阻害されてしまうことで
ある０本発明者等の経験から厚み１０〜１５＋＋ｕ＊以
上の成型物の場合にはＣＯ２ガス養生のみでは所定の強
度を得ることができない。CaO-3iO,+)120+co, mcaco,+
SiO□・nH,0 produced by this reaction (:aC
O8, and 5in2·n)1.0 can be a binder, and when it is produced, it exhibits strength similar to that of cement. Further, the speed of the above reaction is overwhelmingly higher than that of cement hydration reaction or hydrothermal reaction, and therefore the curing time for obtaining a predetermined strength can be shortened compared to the conventional method. However, the disadvantage of this method of developing strength through CO and gas treatment is that as the size, especially the thickness, of the molded product to be cured increases, it takes time for the CO2 gas to diffuse into the interior of the molded product. Alternatively, a dense CaCO5 film may be formed on the surface of the molded product, inhibiting the internal diffusion of gas.From the experience of the present inventors, CO2 gas is It is not possible to obtain the required strength through curing alone.
そこで本発明者等はこの対策として、水熱養生と上記Ｃ
Ｏ２ガス養生とを組合わせることを考えた。この方法に
よれば、成型物表面はＣＯ２ガス養生、及び水熱養生に
よる強度発現が起こり、成型物内部では水熱養生による
強度発現が同時に起こり、且つ成型物表面は緻密なＣａ
ＣＯ，被膜が生成される為に、吸水性、或いは凍結融解
性の優れた硬化体（建材）が製造できるようになった。Therefore, the present inventors proposed hydrothermal curing and the above-mentioned C.
We considered combining it with O2 gas curing. According to this method, strength development occurs on the surface of the molded product through CO2 gas curing and hydrothermal curing, and strength development occurs simultaneously on the inside of the molding due to hydrothermal curing, and the surface of the molded product is made of dense Ca.
Because CO and a film are produced, it has become possible to produce hardened bodies (building materials) with excellent water absorption or freeze-thaw properties.
又その製品が高級化するにつれて、白華現象等の欠点が
目立つが、本発明を用いて製造した製品はその表面が緻
密なＣａＣＯ５被膜で覆われ、従って白華現象の原因物
質であるにａＧＯ３がその経時で生成されるようなこと
がない為に、白華現象を殆ど起こさないことも判った。In addition, as the products become more sophisticated, defects such as efflorescence become more noticeable, but the surface of the products manufactured using the present invention is covered with a dense CaCO5 film, and therefore aGO3, which is the causative agent of the efflorescence phenomenon, becomes more noticeable. It was also found that because there is no formation of efflorescence over time, the efflorescence phenomenon hardly occurs.
又、ＣＯ２ガス養生と水熱養生とを合わせ行うことの経
済性については、そのＣ（ｈガス源としてＣＯ２を含有
した燃焼排ガスを用いることにより解決される。Furthermore, the economic efficiency of combining CO2 gas curing and hydrothermal curing can be solved by using combustion exhaust gas containing CO2 as the C(h gas source).
又本発明は水熱養生とＣＯ２ガス養生との組合わせ方法
も同時に提示している。この組合わせ方はその建材の用
途により変化させて考えるべきで、例えば成形物表面に
緻密なＣａ（：０３被膜を形成することにより吸水性、
あるいは凍結融解性を改善したいのであれば、水熱養生
完了後に６０２含有ガスを常圧下で吹き込めば達成され
るし、又発現強度の改善を図るのが目的であれば、ＣＯ
３含有ガスを昇圧し、水熱養生中に吹き込めば達成され
るであろう。又、養生時間を短縮したいのであれば、水
熱養生を開始する前にＣＯ２含有ガスでオートクレーブ
内部を置換するという方法をとれば容易にその目的は達
成できる。The present invention also presents a method of combining hydrothermal curing and CO2 gas curing. The method of combination should be changed depending on the use of the building material. For example, by forming a dense Ca(:03) film on the surface of the molded product, water absorption and
Alternatively, if you want to improve the freeze-thaw properties, you can achieve this by blowing 602-containing gas under normal pressure after hydrothermal curing, and if you want to improve the developed strength, CO
This could be achieved by increasing the pressure of the 3-containing gas and injecting it during hydrothermal curing. Furthermore, if it is desired to shorten the curing time, this objective can be easily achieved by replacing the inside of the autoclave with CO2-containing gas before starting hydrothermal curing.
本発明に用いられる粉末原料としては、硅酸、珪石等の
硅酸質原料と石灰およびセメント系等の石灰質原料、或
はγ−２Ｃａｏ−５ｉ０２を主組成とした還元期の電気
炉スラグ、合成γ−２ＣａＯ・５ｉｎ２等である。The powder raw materials used in the present invention include silicic acid raw materials such as silicic acid and silica stone, calcareous raw materials such as lime and cement, or electric furnace slag in the reduction stage mainly composed of γ-2Cao-5i02, synthetic γ-2CaO・5in2, etc.
（実施例）
粉末原料として
（ａ）セメント：硅酸＝７０：３０（重量％）（ｄ）生
石灰：硅酸＝６０：４０（重量％）の４種類配合したも
のを、−水分約２０％添加した後、充分混練し、１０ｍ
５ （φ）Ｘ１５ｍｍ（Ｊ２）にプレス成形した。(Example) A mixture of four types of powder raw materials: (a) cement: silicic acid = 70:30 (wt%), (d) quicklime: silicic acid = 60:40 (wt%), - about 20% moisture After adding, knead thoroughly and
5 (φ) x 15 mm (J2).
養生方法として、
（Ａ）従来法のオートクレーブ（水熱反応のみ）（オー
トクレーブ処理圧力、ｉｏ時間）（Ｂ）処理容器内雰囲
気を予めＣＯ２濃度を約２０％含有した燃焼排ガスで置
換した後オートクレーブ（オートクレーブ−５時間、１
０時間）
（Ｃ）オートクレーブ養生後ＣＯ２濃度約２０％含有し
た燃焼排ガスを処理容器内に吹込んで冷却させながら養
生（オートクレーブ＝５時間、１０時間、冷却時間３時
間）
（Ｄ）オートクレーブ養生後、処理容器内雰囲気をＣＯ
，濃度約５０％含有ガスで置換して再度オートクレーブ
（前段のオートクレーブ−４時間、９時間、後段の６０
２雰囲気のオートクレーブ処理圧力）
のＣＯ□雰囲気でオートクレーブ処理圧力５ｋｇ／ｃｍ
２．１０ｋｇ／ｃｍ”で実施した。その硬化体の圧潰強
度の測定結果を表に示す。As a curing method, (A) Conventional autoclave (hydrothermal reaction only) (autoclave processing pressure, io time) (B) Autoclave after replacing the atmosphere inside the processing container with combustion exhaust gas containing approximately 20% CO2 concentration ( Autoclave - 5 hours, 1
0 hours) (C) After autoclave curing, combustion exhaust gas containing about 20% CO2 concentration is blown into the processing container and cured while cooling (autoclave = 5 hours, 10 hours, cooling time 3 hours) (D) After autoclave curing, The atmosphere inside the processing container is CO
, autoclave again with gas containing about 50% concentration (first stage autoclave - 4 hours, 9 hours, second stage 60 hours)
Autoclave processing pressure in CO□ atmosphere (2 atmosphere autoclave processing pressure) 5kg/cm
2.10 kg/cm''. The results of measuring the crushing strength of the cured product are shown in the table.
圧潰強度測定結果 （単位：ｋｇ／ｃｍ２）上記表から
明らかの如く、通常のオートクレーブ法と比較してｃｏ
２含有ガスと共存させたオートクレーブ法では、同じ原
料においてその強度発現は著しく大きくなることが判る
。Crushing strength measurement results (unit: kg/cm2) As is clear from the table above, the co
It can be seen that in the autoclave method in which the material is coexisted with a gas containing 2, the strength development is significantly increased for the same raw material.
（発明の効果）
以上の如く本発明法によれば、建材などに使用される無
機硬化体の製造を、従来法に比べ強度発現、を短時間で
行うことができ、低コストで緻密化が図られる等の優れ
た効果を有する。 。(Effects of the Invention) As described above, according to the method of the present invention, inorganic cured bodies used for building materials can be produced in a shorter time than conventional methods, and can be densified at low cost. It has excellent effects such as: .
Claims (1)
れを成形後、ＣＯ＿２含有ガス雰囲気中でオートクレー
ブ養生し、硬化させることを特徴とする無機硬化体の製
造方法。 ２ 処理容器内雰囲気を予めＣＯ＿２含有ガスで置換し
た後、オートクレーブ養生することを特徴とする請求項
１記載の無機硬化体の製造方法。 ３ 処理容器内において、オートクレーブ養生後、その
冷却時にＣＯ＿２含有ガスを吹込んで養生することを特
徴とする請求項１記載の無機硬化体の製造方法。 ４ オートクレーブ養生後、処理容器内雰囲気をＣＯ＿
２含有ガスで置換して再度オートクレーブ養生すること
を特徴とする請求項１記載の無機硬化体の製造方法。[Claims] 1. A method for producing an inorganic cured product, which uses powdered siliceous raw materials and calcareous raw materials as main raw materials, which is molded and then cured in an autoclave in a CO_2-containing gas atmosphere to be cured. . 2. The method for producing an inorganic cured product according to claim 1, wherein the atmosphere in the processing container is replaced with a CO_2-containing gas in advance, and then autoclave curing is carried out. 3. The method for producing an inorganic cured product according to claim 1, wherein after curing in an autoclave, CO_2-containing gas is blown into the processing container during cooling. 4 After autoclave curing, change the atmosphere inside the processing container to CO_
2. The method for producing an inorganic cured product according to claim 1, wherein the autoclave is cured again after replacing with a gas containing 2-containing gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63050368A JPH01224283A (en) | 1988-03-03 | 1988-03-03 | Production of inorganic cured form |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63050368A JPH01224283A (en) | 1988-03-03 | 1988-03-03 | Production of inorganic cured form |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01224283A true JPH01224283A (en) | 1989-09-07 |
| JPH0451516B2 JPH0451516B2 (en) | 1992-08-19 |
Family
ID=12856945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63050368A Granted JPH01224283A (en) | 1988-03-03 | 1988-03-03 | Production of inorganic cured form |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01224283A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001206788A (en) * | 2000-01-21 | 2001-07-31 | A & A Material Corp | Building board |
| JP2008120641A (en) * | 2006-11-14 | 2008-05-29 | Tokyo Institute Of Technology | Method for producing calcium silicate |
-
1988
- 1988-03-03 JP JP63050368A patent/JPH01224283A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001206788A (en) * | 2000-01-21 | 2001-07-31 | A & A Material Corp | Building board |
| JP2008120641A (en) * | 2006-11-14 | 2008-05-29 | Tokyo Institute Of Technology | Method for producing calcium silicate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0451516B2 (en) | 1992-08-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2418187A2 (en) | Dry mixture for manufacturing cellular fibro concrete and method therefor | |
| KR20230162898A (en) | Method for manufacturing carbonated precast concrete products with improved durability | |
| JPS6363505B2 (en) | ||
| JP6563270B2 (en) | Cementitious hardened body and method for producing the same | |
| JPH01224283A (en) | Production of inorganic cured form | |
| CN115894075A (en) | Carbonized product and preparation method and application thereof | |
| US9957197B1 (en) | Porous geopolymers | |
| KR20100112800A (en) | Cement binder composition, super ultra high strength precast concrete composition and method for producing super ultra high strength precast concrete goods using the same | |
| JPS6042263A (en) | Manufacture of cement moldings | |
| RU2120926C1 (en) | Raw mix for manufacturing non-autoclave cellular concrete of natural hardening, and method of manufacturing products from cellular concrete | |
| JP3618001B2 (en) | Porous open cell concrete molded body and method for producing the same composite | |
| KR920000153B1 (en) | Concrete having high-strength and preparation method thereof | |
| KR20190121057A (en) | Method for manufacturing geopolymer using metakaolin | |
| JP3090085B2 (en) | Manufacturing method of cement ceramic products | |
| US935616A (en) | Vitrified cement product and process of making same. | |
| JP2527152B2 (en) | Ceramic product and its manufacturing method | |
| KR100474964B1 (en) | The composition for height-intensity compound of cement | |
| JPS62265160A (en) | Manufacture of alc | |
| JPS6152116B2 (en) | ||
| JPS6021839A (en) | Manufacture of cement moldings | |
| JPH07291701A (en) | Production of coal ash caked compact | |
| KR870000655B1 (en) | Method for producing a cement products | |
| SU1557131A1 (en) | Method of manufacturing calcareous brick | |
| JPS6230653A (en) | Manufacture of ceramic-like material | |
| Williams | Artificial silicates |