JPS5818337B2 - gypsum cement composition - Google Patents
gypsum cement compositionInfo
- Publication number
- JPS5818337B2 JPS5818337B2 JP6032275A JP6032275A JPS5818337B2 JP S5818337 B2 JPS5818337 B2 JP S5818337B2 JP 6032275 A JP6032275 A JP 6032275A JP 6032275 A JP6032275 A JP 6032275A JP S5818337 B2 JPS5818337 B2 JP S5818337B2
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- cement
- water
- minutes
- lime
- 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
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【発明の詳細な説明】
本発明は石膏上メン1−組成物に係り、更に詳しくは、
特種の製法で製造したα−石膏とセメント及び水を混合
して得られる石膏セメント組成物に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gypsum plaster 1 composition, and more particularly,
This invention relates to a gypsum-cement composition obtained by mixing α-gypsum produced by a special method, cement, and water.
近年高強度性半水石膏製品がα−石膏を原料として作ら
れる様になって、その膨張性を利用した分野の各種成型
材料用に使用されて来ている。In recent years, high-strength gypsum hemihydrate products have come to be made from α-gypsum as a raw material, and have been used for various molding materials in fields that take advantage of its expandability.
2等高強度石膏製品は乾燥時はセ°メントに対比される
程の高強度を示すが、湿潤時には強度は急激に低下する
。Grade 2 high-strength gypsum products exhibit high strength when dry, comparable to cement, but when wet, the strength decreases rapidly.
特に該製品を水に浸漬した際の耐水性強度は、時間の経
過とともに石膏の水溶解性に基いて極端に低下するとい
う欠点を有している。In particular, the product has the disadvantage that its water resistance strength when immersed in water is extremely reduced over time due to the water solubility of gypsum.
従って、例えば該製品を石膏ボード等に利用した場合、
長時間経過後は通常のβ−石膏を使用した石膏ボードに
対比して、特にα−石膏を使用することの利点が現れな
い。Therefore, for example, when the product is used for plasterboard, etc.
After a long period of time, the advantages of using α-gypsum, especially compared to plasterboard using normal β-gypsum, do not become apparent.
而し乍ら他方不燃性建材の立場からみる払石膏製品は完
全に不燃であり、前記α−石膏はその耐水性を改善し得
るならば、建材関係えの利用の可能性も大巾に拡がるも
のと期待される。On the other hand, from the perspective of a non-combustible building material, plaster products are completely non-combustible, and if the water resistance of α-gypsum can be improved, the possibilities for its use in building materials will be greatly expanded. It is expected that
他方セメントは建材基礎原料としてその高い強度を利用
して種々用途に使用されているが、石膏との関連では通
常のβ型−石膏との混合使用ではセメントに対比してβ
−石膏硬化物の強度が極端に低いことから何ら混合によ
る特性が期待出来ず、むしろ砂等の骨材を混ぜる方が物
性的にも経済的にも望ましく、従って一般に使用されて
いない。On the other hand, cement is used for various purposes as a basic building material due to its high strength, but in relation to gypsum, it is of the normal β type, and when mixed with gypsum, it has a β type compared to cement.
- Since the strength of the hardened gypsum is extremely low, no properties can be expected from mixing it, and it is more desirable both physically and economically to mix it with aggregate such as sand, and therefore it is not generally used.
若しα−石膏を前記欠点を克服してセメントと混合した
組成物とすることが出来れば、石膏の早い硬化性も同時
に大きな特長となることが予想される。If α-gypsum can be made into a composition mixed with cement by overcoming the above-mentioned drawbacks, it is expected that the rapid hardening of gypsum will also be a major feature.
而し乍ら元来セメントは強アルカリ性であり、石膏特に
化学石膏は酸性物質を挾雑した酸性物質であり混合する
ことにより疑凝結が起ったり、硬化速度も遅くなる短所
を有している。However, cement is originally strongly alkaline, and gypsum, especially chemical gypsum, is an acidic substance mixed with acidic substances, and when mixed, it has the disadvantage of causing pseudo-setting and slowing down the hardening speed. .
本発明者達は特にアルカリ性のセメントとの混合を予想
し、予めアルカリを加えてアルカリ性にして得られる石
膏を焼成して得られるα−石膏を原料とするときは使用
時にα−石膏に石灰等を投与してアルカリ性にしてセメ
ントと混合する場合に比べると硬化性が甚しく早く、セ
メントの混合割合によって硬化性が殆んど変らない硬化
性組成物が得られることを見出し、しかも得られる硬化
物の水浸漬後の強度は石膏よりも強い強度を有すること
を見出し本発明に到達した。The inventors of the present invention particularly anticipated mixing with alkaline cement, and when using α-gypsum obtained by calcining gypsum that has been made alkaline by adding alkali in advance as a raw material, lime etc. It has been discovered that a curable composition can be obtained which has extremely fast curing properties compared to the case where it is made alkaline by administering and mixed with cement, and the curing properties hardly change depending on the mixing ratio of cement. The present invention was achieved by discovering that the strength of objects after immersion in water is stronger than that of gypsum.
即ち本発明は焼成後のpHが7以上になるようにアルカ
リ性物質を混合し1こ後焼成して得られるα−石膏とセ
メント及び水を混合して得られる石膏セメント組成物で
ある。That is, the present invention is a gypsum-cement composition obtained by mixing α-gypsum, cement, and water, which is obtained by mixing an alkaline substance so that the pH after firing becomes 7 or higher and then firing the mixture once.
以下に具体的な例をもって本発明を説明する。The present invention will be explained below using specific examples.
石膏は元々、中性である筈であるが、塩類の複分解又は
中和で得られる中性の石膏三水塩を焼成して得られる石
膏は結晶水中に酸分が残るために水中で攪拌懸濁した後
水層のpHを測定すると例えばp)(5,5の様な酸性
を示し、焼成後のi)Hを7前後にする為には石灰水等
を加えてpHを10近くにした後焼石膏にすることが必
要である。Gypsum is originally supposed to be neutral, but gypsum obtained by firing neutral gypsum trihydrate obtained by double decomposition or neutralization of salts cannot be stirred in water because acid remains in the crystallization water. When the pH of the aqueous layer was measured after it became cloudy, it was found to be acidic, for example p) (5,5), and in order to make the i)H after firing around 7, lime water etc. were added to bring the pH close to 10. It is necessary to use post-calcined plaster.
本発明に使用するα−石膏は単に通常の如くにして製造
したα−石膏に石灰を混合するのではなく、予め石灰を
加えてアルカ)ノ性にした石膏2水塩を焼成して、焼成
後のα−石膏のpHが7以上のアルカリ性を示すα−石
膏として使用することがその特長であり、p)(の好ま
しい範囲は10以上で。The α-gypsum used in the present invention is not simply prepared by mixing lime with α-gypsum produced in the usual manner, but by calcining gypsum dihydrate which has been made alkaline by adding lime in advance. Its feature is that it can be used as an alkaline α-gypsum with a pH of 7 or higher, and the preferred range of p) is 10 or higher.
あるがpH7以上10未満であっても、アルカリ性の石
膏を使用すれば、効果の程度が少いだけで該効果の成因
は本質的に変らないものと考えられる。However, even if the pH is 7 or more and less than 10, it is considered that if alkaline gypsum is used, the effect will be slightly reduced and the cause of the effect will not essentially change.
本発明に述べられるα−石膏の製造方法は特願昭48−
21502号(特開昭49−115996号)に記載さ
れた方法に準じて製造されるが、燐酸副生石膏を使用し
て、前記方法で製造されたα−石膏のpHと凝結終結時
間との関係の例示は第1表の如くになる。The method for producing α-gypsum described in the present invention is disclosed in Japanese Patent Application No. 1973-
The relationship between the pH and setting completion time of α-gypsum produced according to the method described in No. 21502 (Japanese Unexamined Patent Publication No. 49-115996), using phosphoric acid by-product gypsum, and the method described above. An example of this is shown in Table 1.
註・燐酸副生石膏の場合添加する消石灰の量・・焼成し
て得られるα−石膏のr)H
アルカリ性α−石膏の効果の最も顕著に現れるpH10
,5を示すα−石膏についてセメントの混合比を変えた
組成物と水との混和で得られる見掛終結を第1図の曲線
Aに示し、対照としてpH6,0を示す通常のα−石膏
の見掛終結を同じく曲線Bとして示した。Note: In the case of phosphoric acid by-product gypsum, the amount of slaked lime added...r)H of α-gypsum obtained by calcination pH 10 where the effect of alkaline α-gypsum is most noticeable
, 5, the apparent results obtained by mixing compositions with different cement mixing ratios with water are shown in curve A in Figure 1, and as a control, normal α-gypsum with a pH of 6.0. The apparent end of is also shown as curve B.
また同時に石膏の水懸濁液のpHを11以上になる様に
、硬化時に石灰を同時に添加した例を同じく曲線Cに示
す。Curve C also shows an example in which lime was added at the same time during curing so that the pH of the gypsum aqueous suspension became 11 or higher.
またpH7,5を示すα−石膏の見掛終結を同じく曲線
りに示す。Also, the apparent termination of α-gypsum, which has a pH of 7.5, is also shown as a curved line.
第1図に従って本発明の詳細な説明すると、通常のα−
石膏はセメントの混合比率が上昇するに従って見掛凝結
時間は大巾に変動する(曲線B)が、特に少量約10%
迄の添加によって、急激に硬化速度は遅くなる。To explain the present invention in detail according to FIG. 1, the normal α-
The apparent setting time of gypsum varies widely as the cement mixing ratio increases (curve B), but especially in small amounts of about 10%.
By adding up to this point, the curing speed decreases rapidly.
而してpH10,5を示す焼成後のp)(の高いアルカ
リ性α−石膏を使用する本発明では、セメントの添加量
が増えても、硬化速度の遅延は殆んどなくむしろ促進さ
れ、特に対照例Bに対比し少量のセメント添加によって
硬化速度が急激に遅くなる現象は現れず逆に早くなると
いう特性を示している(曲線A)。Therefore, in the present invention, which uses alkaline α-gypsum with a high pH of 10.5 (p) after firing, even if the amount of cement added increases, the hardening speed is hardly delayed and is actually accelerated. In contrast to Control Example B, the curing rate does not suddenly slow down due to the addition of a small amount of cement, but on the contrary shows a characteristic that it becomes faster (curve A).
石膏の酸性部分がセメントにより中和されると考え硬化
時に石灰を加えた場合(曲線C)では、石灰により石膏
懸濁水のpHを11にするに必要な石灰を硬化時に季加
した場合であるが、予めpH10,5になるように製造
した本発明のα−石膏を使用する曲線Aに対比して、硬
化の速度は大巾に遅延されている。In the case where lime is added during curing, assuming that the acidic part of the gypsum is neutralized by cement (curve C), the amount of lime necessary to bring the pH of the gypsum suspension water to 11 with lime is added during curing. However, in contrast to curve A using the α-gypsum of the invention previously prepared to a pH of 10.5, the rate of hardening is significantly retarded.
此の曲線Aと曲線Cとの挙動の差異は石灰を添加する際
に焼成の前に入れる力)、後に入れるかの差であるが、
硬化における硬化物の形成過程が大巾に異ったものであ
ることを示しており、本発明に示した石灰で中和した後
焼成したα−石膏の場合には、セメント等のアルカリ性
物質の混和性が、甚しく改変されていることを示してい
る。The difference in behavior between curve A and curve C is whether the force is applied before or after the lime is added.
This shows that the process of forming a hardened product during hardening is vastly different. It shows that the miscibility is severely altered.
一方pH7,5に焼成して得られるα−石膏の場合を曲
線りに示したが、セメントの入らない石膏のみの硬化で
は、pH10,5を示すα−石膏に対比すると硬化速度
は遅くなっているが、第1図の曲線Cに対比して硬化速
度は全般的に早く本発明の曲線Aと比較用の曲線Cとの
中間の様相を示していることが判る。On the other hand, the curve shows the case of α-gypsum obtained by firing to pH 7.5, but when curing only gypsum without cement, the curing speed is slower compared to α-gypsum which shows pH 10.5. However, compared to curve C in FIG. 1, it can be seen that the curing rate is generally faster and exhibits an intermediate appearance between curve A of the present invention and curve C for comparison.
この様にして得られる石膏とセメントと水との混合で出
来る石膏セメント組成物は石膏の水和反応に基づく石膏
の硬化が先行し、石膏の結晶格子の中にセメント未凝結
分が包含された形で見掛けの凝結が進み、次いで長時間
の熟成の後のセメントの硬化が進行するものと思われる
が、セメントの混和量が増大するに従って、石膏の吸水
時における機械強度が増し、急硬化性のセメント硬化物
が得られる。In the gypsum-cement composition obtained by mixing gypsum, cement, and water obtained in this way, the gypsum hardens based on the hydration reaction of the gypsum, and the unset portion of the cement is included in the crystal lattice of the gypsum. It is thought that the apparent setting progresses due to the shape, and then the hardening of the cement progresses after a long period of aging. However, as the amount of cement mixed in increases, the mechanical strength of the gypsum when it absorbs water increases, and the rapid hardening of the cement increases. A hardened cement product is obtained.
本発明の石膏セメント組成物を使用した硬化物の乾燥時
の機械強度は必ずしもセメント単体並びに石膏単体の硬
化物に対比すると大きくはないが、石膏の急硬化性を保
持したまま、而も従来のβ型石膏に対比すると、気乾時
または混温時においても強度は強く、而もセメントやア
ルカリ性を示す砂等の添加割合によって固まり方の余り
変らない経済性の高い硬化物を得る特長を有している。Although the dry mechanical strength of a cured product using the gypsum-cement composition of the present invention is not necessarily greater than that of a cured product of cement alone or gypsum alone, it is possible to maintain the rapid hardening properties of gypsum while maintaining Compared to β-type gypsum, it has strong strength even when air-dried or at mixed temperatures, and it has the advantage of producing a highly economical hardened product whose hardening behavior does not change much depending on the addition ratio of cement, alkaline sand, etc. are doing.
本発明の組成物の性能を示す例として、石f4セメント
板やパルプセメント板等の製造方法に準じて、水200
0部にセメントまたはセメン−トに本発明に基づ(p)
(10,5を示すα−石膏との混合物100部、ボルフ
5部1石綿5部を各々加え混合攪拌し、この混合懸濁液
を抄造脱水し、成型硬化後に得られる6、2〜8.2
mallの積層石膏セメント板の試作ボードの4週間熟
成後の物性測定結果を下記第2表に示す。As an example showing the performance of the composition of the present invention, water 200
0 parts of cement or cement according to the invention (p)
(100 parts of a mixture with α-gypsum showing 10.5, 5 parts of Volf and 5 parts of asbestos were added, mixed and stirred, this mixed suspension was made and dehydrated, and after molding and hardening the obtained 6,2-8. 2
Table 2 below shows the results of measuring the physical properties of a prototype mall laminated gypsum cement board after aging for 4 weeks.
註・後述実施例25参照
即ち石膏のみの硬化物は気乾時強度は比較的強く特に石
膏通常品(β石膏)に対比してα−石膏を使用すること
により強度の強い硬化品が得られる。Note: Refer to Example 25 below.In other words, a cured product made only of gypsum has relatively strong strength when air-dried.In particular, by using α-gypsum, a strong cured product can be obtained compared to a regular gypsum product (β gypsum). .
而し乍ら吸水後の該硬化物強度は石膏のみの場合には極
端に悪くなり、そのため通常の石膏ボードは石膏の両面
を紙でサンドインチして強度をもたせている。However, the strength of the cured product after absorbing water is extremely poor if it is made of only gypsum, so in normal gypsum boards, both sides of the gypsum are sandwiched with paper to give them strength.
本発明による石膏セメント組成物を使用した硬化品は既
述の如く石膏と略同等の硬化速度を持つ反面、石膏に対
比して非常に優れた耐水強度を有しており、長時間の経
過によって(4週間)セメントの硬化も進んでいること
が判る。As mentioned above, cured products using the gypsum-cement composition of the present invention have a curing speed that is almost the same as that of gypsum, but on the other hand, they have extremely superior water resistance strength compared to gypsum. (4 weeks) It can be seen that the hardening of the cement is progressing.
本発明は前記特定製法になるα−石膏とセメントと水か
らなる組成物であるが、該セメントは主としてポルトラ
ンドセメント及び白色セメントであるが急硬性セメント
等の特種組成のものを用いる場合には石膏の硬化に影響
を与える場合もある。The present invention is a composition consisting of α-gypsum, cement, and water produced by the above-mentioned specific manufacturing method. The cement is mainly Portland cement and white cement, but when using a special composition such as rapid hardening cement, gypsum It may also affect the hardening of
更にアルミナセメントの場合にはエントリジャイトの生
成によるセメントバチルスの発生も考えられる。Furthermore, in the case of alumina cement, the generation of cement bacilli due to the formation of entrigite is also considered.
セメントに常用される砂、木粉9石綿、骨材を適当量本
発明の石膏セメント組成物に配合するこきは、本発明の
利用に係る硬化物の要求される強度及び経済性71)ら
も当然考えられることであり、更にセメントの耐水性を
改善するためのような公知の添加物や、石膏セメント組
成物の物性を改善するためのような公知の第3成分を添
加して物性を向上させることも出来る。The method of blending appropriate amounts of sand, wood flour, asbestos, and aggregate commonly used in cement into the gypsum-cement composition of the present invention also meets the required strength and economic efficiency of the cured product for use in the present invention71). Naturally, it is possible to further improve the physical properties by adding known additives such as those for improving the water resistance of cement or known third components such as those for improving the physical properties of the gypsum cement composition. You can also do it.
また本発明の石膏セメント組成物は石膏硬化の際に使用
される珪弗化塩やKCl:に2SO4等の既知の硬化促
進剤を添加して硬化を早くしたり、のような有機添加物
等を加えて硬化を遅延調整することも出来る。In addition, the gypsum cement composition of the present invention may be prepared by adding a known curing accelerator such as 2SO4 to the silifluoride salt or KCl used in curing gypsum to speed up curing, or by adding organic additives such as It is also possible to delay the curing by adding .
本発明の石膏セメント組成物に硬化促進剤を混合させた
場合該組成物を利用して石膏セメントボードを製造する
には、従来の石膏ボードの製造工程を偉力)に改造する
こさにより石膏セメントボードを作ることが出来、また
そのま5或は硬化遅延剤と混ぜて使用することによって
、吹き付は材流し込み材等の石膏セメントプラスターと
して使用することが可能であり、特に本発明の石膏セメ
ント組成物の前記のような利用に際しては、α−石膏特
に特願昭48−21502号に記した初期流動性に優れ
たα−石膏の特長も発揮される。When a curing accelerator is mixed with the gypsum cement composition of the present invention, gypsum cement board can be manufactured using the composition by modifying the conventional gypsum board manufacturing process. In addition, by using it as is or by mixing it with a hardening retarder, spraying can be used as a gypsum-cement plaster for pouring materials, etc. In particular, the gypsum-cement composition of the present invention When the product is used in the above manner, the advantage of α-gypsum, particularly α-gypsum, which has excellent initial fluidity as described in Japanese Patent Application No. 1982-21502, is also exhibited.
以下に図及び表に示した実験例について本発明を具体的
に示すが、特に混水率は一般の石膏製品の機械強度を支
配する大きな因子を占めることは良く知られたことであ
り、実施例には混水配合量の多い例を示したが本発明は
実施例の配合割合に限定されるものではない。The present invention will be specifically illustrated with reference to the experimental examples shown in the figures and tables below. However, it is well known that the water mixing ratio is a major factor controlling the mechanical strength of general gypsum products. Although the example shows a large amount of mixed water, the present invention is not limited to the mixing ratio of the example.
実施例1−7(第1図のAの実験)
新らしく作ったpH10,5を示すα−石膏100gを
水45g中に加え、水を石膏粉末になじませた後見掛け
の終結時間を石膏硬化の常法JISR9112に基いて
測定したところ、19分50秒であった。Example 1-7 (Experiment A in Figure 1) Add 100 g of freshly prepared α-gypsum with a pH of 10.5 to 45 g of water, and after the water is blended with the gypsum powder, the apparent final time for gypsum curing was determined. When measured based on the standard method JISR9112, the time was 19 minutes and 50 seconds.
全く同様にしてα−石膏90gポルトランドセメント1
0g(実施例2)、α−石膏soyポルトランドセメン
ト20g(実施例3)、α−石膏6(lポルトランドセ
メント40g(実施例4)、α−石膏40.9ポルトラ
ンドセメント60g(実施例5)α−石膏20.?ポル
トランドセメント80J(実施例6)、α−石膏10g
ポルトランドセメント90y(実施例7)の夫々の混合
物を作り、水45gの中に加えて石膏硬化の常法に基い
て見掛は終結時間を測定し実施例215分45秒、実施
例315分40秒。In exactly the same way, α-gypsum 90g Portland cement 1
0 g (Example 2), α-gypsum soy portland cement 20 g (example 3), α-gypsum 6 (l portland cement 40 g (example 4), α-gypsum 40.9 portland cement 60 g (example 5) α - Gypsum 20.?Portland cement 80J (Example 6), α-gypsum 10g
A mixture of 90y of Portland cement (Example 7) was prepared, added to 45g of water, and the apparent completion time was measured based on the conventional method of plaster curing. seconds.
実施例415分10秒、実施例515分30秒、実施例
616分10秒、実施例717分05秒を得た。Example 4: 15 minutes and 10 seconds, Example 5: 15 minutes and 30 seconds, Example 6: 16 minutes and 10 seconds, and Example 7: 17 minutes and 05 seconds.
実施例8〜14(第1図Bの実験)
10gの石膏を100gの水中で攪拌した際水素イオン
濃度(pH)が6.0を示めす新らしく作ったα−石膏
を使用し、100gの該α−石膏を45gの水中に添加
し石膏硬化の常法に従って見掛けの終結時間を測定する
と15分てあつ1こ(実施例8)。Examples 8 to 14 (Experiments shown in Figure 1 B) Using newly made α-gypsum, which showed a hydrogen ion concentration (pH) of 6.0 when 10 g of gypsum was stirred in 100 g of water, 100 g of When the α-gypsum was added to 45 g of water and the apparent completion time was measured according to a conventional method for curing gypsum, it heated up in 15 minutes (Example 8).
次に実施例8と全く同じ様にして見掛けの終結時間を常
法により測定するさく実施例9)即ちα−石膏90.9
ポルトランドセメント10gの混合物では見掛けの終結
44分20秒であり、(実施例10)即ち、α−石膏8
0gポルトランドセメン1〜20gでは45分20秒、
(実施例11)即ちα−石膏60gポルトランドセメン
ト40gでは53分、(実施例12)即ち、石膏41ポ
ルトランドセメント60gでは60分50秒、(実施例
13)即ち、石膏20gポルトランドセメント80gで
は72分、(実施例14)即ち、石膏11’ポルトラン
ドセメント90gでは96分20秒であった。Next, in exactly the same manner as in Example 8, the apparent completion time was measured by a conventional method.Example 9) That is, α-gypsum 90.9
For a mixture of 10 g of Portland cement, the apparent final time was 44 minutes 20 seconds (Example 10), i.e., α-gypsum 8
45 minutes 20 seconds for 0g Portland Semen 1-20g;
(Example 11) That is, 53 minutes for 60 g of α-gypsum and 40 g of Portland cement. (Example 12) That is, 60 minutes 50 seconds for 41 gypsum and 60 g of Portland cement. (Example 13) That is, 72 minutes for 20 g of gypsum and 80 g of Portland cement. (Example 14) That is, for 90 g of gypsum 11' Portland cement, it was 96 minutes 20 seconds.
実施例15〜19(第1図のCの実験)
実施例8−14に用いたpH6,0を示す新らしく製造
したα−石膏を用い該α−石膏100gに対して0.6
Jの石灰と45gの水を加え、(第1表記載により焼成
後のpHを6.0より10.5にあげる為の石灰の添加
必要量は略0.6gである。Examples 15 to 19 (Experiment C in Figure 1) Using the newly produced α-gypsum with a pH of 6.0 used in Examples 8-14, a concentration of 0.6 per 100 g of the α-gypsum was used.
J lime and 45 g of water were added (according to Table 1, the required amount of lime to raise the pH after firing from 6.0 to 10.5 is approximately 0.6 g).
)それらの混合物ならびに石灰及び水の存在下での該α
−石膏の見掛けの終結時間を常法に基いて測定した。) in their mixtures and in the presence of lime and water.
- The apparent completion time of the plaster was measured according to a conventional method.
即ち、(実施例15)α−石石膏100召ルトランドセ
メント10g9石灰0.6g,61分50秒,(実施例
17)α−石膏80gポルトランドセメント20J1石
灰0.6F 68分20秒。That is, (Example 15) α-gypsum 100 grams, 10 g of lime, 0.6 g of lime, 61 minutes 50 seconds, (Example 17) α-gypsum, 80 g of portland cement 20J1 lime, 0.6 F, 68 minutes 20 seconds.
(実施例18)α−石膏4CBi’ポルトランドセメン
ト60J9石灰0.6g 68分,(実施例19)α−
石膏2(lポルトランドセメントso.y.石灰0.6
,? 98分の結果を得た。(Example 18) α-gypsum 4CBi'Portland cement 60J9 lime 0.6g 68 minutes, (Example 19) α-
Gypsum 2 (l portland cement soy. lime 0.6
,? A result of 98 minutes was obtained.
実施例20〜24(第1図のDの実験)
石膏101に対し0.1gの石灰を予め添加して後焼成
して得られるpH7.45を示したα−石膏を材料とし
てこれを七メンI−吉の混合割合を変え1こ混合物10
0Jを水45gに加えて混合後攪拌し、その後見掛は終
結時間を常法に従って測定した。Examples 20 to 24 (Experiment D in Figure 1) Using α-gypsum with a pH of 7.45 obtained by adding 0.1 g of lime to 101 gypsum in advance and post-calcining it, this was used as a material. Change the mixing ratio of I-Kichi and mix 1 to 10
0J was added to 45 g of water, mixed and stirred, and then the apparent completion time was measured according to a conventional method.
(実施例20)α−石膏101 28分30秒(実施
例21)α−石膏80gポルトランドセメント20g
41分10秒,(実施例22)α−石膏6CBi’ポル
トランドセメント40g 48分50秒,(実施例23
)α−石膏40gポルトランドセメント61 53分
20秒,(実施例24)α−石膏20gポルトランドセ
メント80F 58分を得た。(Example 20) α-gypsum 101 28 minutes 30 seconds (Example 21) α-gypsum 80g Portland cement 20g
41 minutes 10 seconds, (Example 22) α-gypsum 6CBi' Portland cement 40 g 48 minutes 50 seconds, (Example 23
) α-gypsum 40 g Portland cement 61 53 minutes 20 seconds, (Example 24) α-gypsum 20 g Portland cement 80F 58 minutes.
実施例 25
8Jセメント板,パルプセメント板の製造法に準じ抄造
法によってセメント100g又は石膏とセメントの混合
物100.!i’と石綿5g,パルプ5I水2000c
cとの混合スラリーを用いて抄造脱水し6枚を重ね合せ
て得られる成形物を、室温で4週間凝固熟成させたのち
厚さ6.2〜8. 2mmのコンクリート板及び石膏セ
メント板を作成した。Example 25 100g of cement or 100g of a mixture of gypsum and cement was produced by a papermaking method similar to the manufacturing method of 8J cement board and pulp cement board. ! i' and asbestos 5g, pulp 5I water 2000c
A molded product obtained by making and dehydrating six sheets using a slurry mixed with c and C was solidified and aged for 4 weeks at room temperature, and then a molded product with a thickness of 6.2 to 8. A 2mm concrete board and a gypsum cement board were created.
2等試料板を巾4crrL長さ8CrfLに切り、曲げ
強度測定用のテストピース各5枚について、45°C±
2°Cの空気乾燥器中で4時間乾燥したのち荷重点の平
均荷重速度を20kg/分として曲げ破壊強度を測定し
た。Cut the second grade sample plate into width 4 crrL and length 8CrfL, and heat each 5 test pieces for bending strength measurement at 45°C±.
After drying in an air dryer at 2°C for 4 hours, the bending fracture strength was measured at an average loading rate of 20 kg/min at the loading point.
一方別の各5枚のテストピースについて24時間常温の
水中に浸漬した後直ちに曲げ破壊強度の測定を行ったが
、之等の結果を前記第2表に示した。On the other hand, five other test pieces were immersed in water at room temperature for 24 hours, and then their bending fracture strength was immediately measured, and the results are shown in Table 2 above.
図面は本発明の組成物のα−石膏と七メン1−.=の混
合比と見掛終結時間の関係を示すもので、曲線A.Dは
本発明の組成物であり、曲線B,Cはα−石膏のみ若し
くはα−石膏に爾後的に石灰を添加した対照例である。The drawing shows α-gypsum and Shichimen 1- of the composition of the present invention. Curve A.= shows the relationship between the mixing ratio and the apparent completion time. D is the composition of the present invention, and curves B and C are control examples in which only α-gypsum or lime was subsequently added to α-gypsum.
Claims (1)
混合して後焼成して得られるα−石膏とセメント及び水
を混合して得られる石膏セメント組成物。1. A gypsum-cement composition obtained by mixing α-gypsum obtained by mixing an alkaline substance and post-calcining so that the pH after firing becomes 7 or more, cement, and water.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6032275A JPS5818337B2 (en) | 1975-05-21 | 1975-05-21 | gypsum cement composition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6032275A JPS5818337B2 (en) | 1975-05-21 | 1975-05-21 | gypsum cement composition |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS51135927A JPS51135927A (en) | 1976-11-25 |
JPS5818337B2 true JPS5818337B2 (en) | 1983-04-12 |
Family
ID=13138810
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6032275A Expired JPS5818337B2 (en) | 1975-05-21 | 1975-05-21 | gypsum cement composition |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5818337B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6426825U (en) * | 1987-08-11 | 1989-02-15 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4530981A (en) * | 1984-08-13 | 1985-07-23 | E. I. Du Pont De Nemours And Company | Process for making tetrafluoroethylene fine powder |
JP5744538B2 (en) * | 2011-01-26 | 2015-07-08 | 電気化学工業株式会社 | Composition for building material and method for producing carbonated building material |
-
1975
- 1975-05-21 JP JP6032275A patent/JPS5818337B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6426825U (en) * | 1987-08-11 | 1989-02-15 |
Also Published As
Publication number | Publication date |
---|---|
JPS51135927A (en) | 1976-11-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP3511265B2 (en) | Gypsum wall covering material and its manufacturing method | |
US4460720A (en) | Multicomponent concrete superplasticizer | |
JPS61500726A (en) | Non-expanding, high-curing cement | |
JPS59164659A (en) | Liquid cure accelerator for concrete mixture | |
CN112939561B (en) | Phosphogypsum-based light plastering gypsum and preparation method thereof | |
AU2008244018B2 (en) | Gypsum based compositions | |
JPH0476943B2 (en) | ||
JPS5818337B2 (en) | gypsum cement composition | |
JPS5951504B2 (en) | Heat-curing cement composition | |
JPS59466B2 (en) | Water resistant high strength gypsum composition | |
KR100314725B1 (en) | Preparation method of gypsum board | |
JPS5814384B2 (en) | Anhydrite composition | |
JP2000072521A (en) | Gypsum board and its production | |
JP2000044320A (en) | Inorganic hardened body and its production | |
JPH11310443A (en) | Admixture for cement and production of cement-based hardened product | |
JPH04108650A (en) | Method for retarding hardening of cement containing calcium aluminate | |
JP4948724B2 (en) | Non-fired cement cured body and method for producing the same | |
JPH035352A (en) | Production of fiber-reinforced slag gypsum cement-based lightweight cured body | |
JPS6016381B2 (en) | Heat-curing cement composition | |
JPS6016382B2 (en) | Heat-curing cement composition | |
JPS585857B2 (en) | Yakisetsukou Boltland Cement Souvenirs | |
JPS581064B2 (en) | Manufacturing method of inorganic cured body | |
JP2000007417A (en) | Inorganic hardened body and its production | |
JPS581066B2 (en) | Method for producing inorganic cured body | |
JPS5833179B2 (en) | plaster composition |