JPH0112669B2 - - Google Patents
Info
- Publication number
- JPH0112669B2 JPH0112669B2 JP4223280A JP4223280A JPH0112669B2 JP H0112669 B2 JPH0112669 B2 JP H0112669B2 JP 4223280 A JP4223280 A JP 4223280A JP 4223280 A JP4223280 A JP 4223280A JP H0112669 B2 JPH0112669 B2 JP H0112669B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- weight
- parts
- magnesia
- composition
- 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
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- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 97
- 239000004568 cement Substances 0.000 claims description 79
- 239000000395 magnesium oxide Substances 0.000 claims description 50
- 239000000203 mixture Substances 0.000 claims description 37
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 15
- 239000002131 composite material Substances 0.000 claims description 14
- 239000010440 gypsum Substances 0.000 claims description 10
- 229910052602 gypsum Inorganic materials 0.000 claims description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 9
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 9
- 239000004571 lime Substances 0.000 claims description 9
- 238000001723 curing Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000013007 heat curing Methods 0.000 claims description 5
- 239000003607 modifier Substances 0.000 claims description 5
- 238000009998 heat setting Methods 0.000 claims 1
- 238000010030 laminating Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 28
- 239000010410 layer Substances 0.000 description 13
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 239000003365 glass fiber Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 6
- 239000011398 Portland cement Substances 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 238000000576 coating method Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 229910001629 magnesium chloride Inorganic materials 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000009863 impact test Methods 0.000 description 4
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 4
- 229910000400 magnesium phosphate tribasic Inorganic materials 0.000 description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- -1 glycolic acid Chemical class 0.000 description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 3
- 235000019341 magnesium sulphate Nutrition 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 2
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 150000001735 carboxylic acids Chemical class 0.000 description 2
- 235000015165 citric acid Nutrition 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000001509 sodium citrate Substances 0.000 description 2
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 2
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 description 1
- 235000002597 Solanum melongena Nutrition 0.000 description 1
- 244000061458 Solanum melongena Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 150000001734 carboxylic acid salts Chemical class 0.000 description 1
- 229960004106 citric acid Drugs 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000174 gluconic acid Substances 0.000 description 1
- 235000012208 gluconic acid Nutrition 0.000 description 1
- 229950006191 gluconic acid Drugs 0.000 description 1
- 229940005740 hexametaphosphate Drugs 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 229940099690 malic acid Drugs 0.000 description 1
- 239000000546 pharmaceutical excipient Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 1
- 229940048086 sodium pyrophosphate Drugs 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Producing Shaped Articles From Materials (AREA)
Description
本発明は耐水性の改良されたマグネシアセメン
トを主体とする成形物の製造に関する。
マグネシアセメントの硬化体は緻密で硬く、機
械的物性、特に曲げ強度物性はポルトランドセメ
ント硬化体に比べ優れており、さらに繊維補強を
行なうことにより有機プラステイクスと同等の機
械的物性が発現可能である。そしてマグネシアセ
メントの不燃性は、従来の有機プラステイクスの
弱点を補ない、防災上大なき有用性を示すもので
ある。しかし、その反面耐水性能が低いのでその
優れた物性にもかかわらず、広汎な使用範囲を限
定せざるを得ず、屋外や水と接触するような箇所
での使用は避けて用いられている。この耐水性能
を改良するための方法が従来から考えられおり、
マグネシアセメントに耐水性能を付与する添加剤
を加える方法やマグネシアセメント硬化体の表面
を耐水性を有する素材で被覆する方法が提案され
ている。
表面被覆法においては、マグネシアセメント硬
化体と被覆材との接着性が重要な問題となり、接
着不良の場合、界面はく離や耐水性低下の原因と
なる。被覆素材としては、ポルトランドセメント
やアルミナセメントがあり、これらは不燃にして
安価で耐水性能も良好な素材であり、マグネシア
セメントの耐水性向上のための被覆材として有効
なものである。しかし、これら素材はマグネシア
セメントとの接着性が悪く、例えばポルトランド
セントにおいてはマグネシアセメント組成が塩化
マグネシウムを含有するとき、溶出する塩化マグ
ネシウムの作用により急結性を示し、マグネシア
セメントとポルトランドセメントの界面部分が弱
い層となり接着力の弱い複合体となる。
本発明は上記の如き現状にかんがみ、不燃性で
機械的強度が良好にして耐水性にすぐれたマグネ
シアセメント複合体を製造し得る方法を提供する
ことを目的としてなされたものであり、その要旨
はマグネシアセメント硬化性組成物の賦形物に、
アルミナセメント、石こう及び石灰からなる加熱
硬化型セメント組成物を積層した積層物を加熱し
て硬化せしめることを特徴とするマグネシアセメ
ント複合体の製造方法に存する。本発明における
マグネシアセメント硬化性組成物とはマグネシア
セメントに水が添加混合され、加熱によりもしく
は経時的に硬化する状態になされた末硬化の組成
物を指す。そして該組成物は板状、筒状その他の
所望の形状に賦形される。なお、マグネシアセメ
ントとしては活性マグネシアと塩化マグネシウム
及び又は硫酸マグネシウムとを主成物とする従来
より知られているマグネシアセメント配合物が使
用出来るが、耐水性向上のために第３リン酸マグ
ネシウムなどの不溶性リン酸塩を含有しているの
が好ましい。また、上記マグネシアセメント硬化
性組成物に、補強のためにガラス繊維などの繊維
や該繊維で出来たマツト状物や織成物を含有せし
めてもよく、また各種骨材、充填剤等を加えても
よい。次に本発明における加熱硬化型セメント組
成物は従来のアルミナセメントに石こう及び石灰
が加えられた配合物に水が添加混合された、加熱
により硬化する性質を有する未硬化の組成物であ
る。
しかして該加熱硬化型セメント組成物における
配合割合については、アルミナセメント40〜60重
量部、石こう30〜45重量部、石灰10〜15重量部の
比率で配合するのが好ましい。又、水の量はアル
ミナセメント、石こう及び石灰の合計量100重量
部に対し40〜65重量部用いるのが好ましい。さら
に上記組成物に補強のためにガラス繊維などの繊
維状物を加えることも可能であり、各種骨材、充
填剤等を加えることも出来る。
又、上記加熱硬化型セメント組成物に、該組成
物が加熱されて硬化する際の硬化速度を調整し、
急速にすぎる硬化を抑制するための硬化調整剤を
加えるのが好ましく、該硬化調整剤としてはリン
酸、ヘキサメタリン酸塩やピロリン酸ナトリウム
などのリン酸塩、クエン酸、リンゴ酸、グルコン
酸、グルタール酸、グルコール酸などの有機カル
ボン酸、上記有機カルボン酸のアルカリ金属塩な
どの有機カルボン酸塩が挙げられる。そしてとく
にクエン酸のアルカリ金属塩が好適である。又、
硬化調整剤の使用量としてはアルミナセメント、
石こと及び石灰の合計量100重量部に対し0.5〜３
重量部が好適である。本発明方法により複合体を
製造するにはまず前記マグネシアセメント硬化性
組成物を所望の形状に賦形し、この賦形物に前記
加熱硬化型セメント組成物を積層して積層物を用
意するのであるが、この積層は通常マグネシアセ
メント硬化性組成物の賦形物の表面に適宜な手法
により加熱硬化型セメント組成物の比較的薄い層
を設けることにより行われる。
次に上記で用意した積層物を通常60℃以上に加
熱すると硬化が生じマグネシアセメント複合体が
得られる。この硬化に際し、両方の組成物の硬化
がほゞ同時に進行するのが好ましく、そのために
は加熱硬化型セメント組成物の硬化速度を硬化調
整剤の添加により調節するのが好ましい。又、得
られたマグネシアセメント複合体は数日ないし数
日間養生のために放置しておくのが好ましい。
本発明方法により得られたマグネシアセメント
複合体はマグネシアセメント成形体の表面に耐水
性にすぐれ機械的特性も良好なセメント層が、上
記マグネシアセメント成形体表面に強固に結合し
て設けられたものであるので、従来マグネシアセ
メント成形体の適用が困難とされていた耐水性が
要求される用途例えば給排水管等の用途に、表面
層剥離の問題が生じることなく適用することが出
来るのである。上記の様なマグネシアセメント成
形体表面と表面層との強固な結合は本発明におい
て始めて達成されるのであり、例えば成形硬化さ
れたマグネシアセメント成形体の表面に加熱硬化
型セメント組成物を層状に積層し、これを加熱硬
化するといつた方法ではこの様な強固な結合は生
じないのである。
本発明において上記の如く表面層との強固な結
合が得られる理由は詳細には明らかでないが、硬
化しつつあるマグネシアセメント層に生成する
5Mgo―Mgcl2゜H2O（W5型）や3MgO―Mgcl2・
H2O（W3型）の水和鉱物で形成される針状結晶と
アルミナセメントを含む加熱硬化型セメント組成
物層に生成するエトリンガイド（3CaO・
Al2O3・3CaSO4・32H2O）から形成される結晶
とが一体的にからみ合つて生長し、それにより強
固な結合が得られるのではないかと推測される。
本発明のマグネシアセメント複合体の製造方法
は上述の通りの方法であり、とくにマグネシアセ
メント硬化性組成物の賦形物に、アルミナセメン
ト、石こう及び石灰からなる加熱硬化型セメント
組成物を適用し、これらを加熱して硬化せしめる
ものであるから、マグネシアセメント成形物にす
ぐれた耐水性を付与することが出来、該成形物の
適用範囲を耐水性が要求される用途にまで拡げる
ことが出来るのである。
以下本発明につき実施例にもとづいて説明す
る。
実施例 １
酸化マグネシウム100重量部、塩化マグネシウ
ム30重量部、第３リン酸マグネシウム５重量部、
水90重量部を混合し、さらに長さ25ｍ／ｍガラス
繊維チヨツプを容量３％添加し、30cm×30cm角の
型に注型し、さらに、被覆セメントとして、アル
ミナセメント50重量部、焼石膏30重量部、消石灰
20重量部そしてクエン酸ソーダ1.5重量部、水50
重量部添加混合し長さ13ｍ／ｍガラス繊維チヨツ
プを３容量％添加混合し、同型ワクに積層注型
し、90℃に昇温硬化させ、マグネシアセメント10
ｍ／ｍ、被覆セメント２ｍ／ｍ厚さの複合体を得
た。脱型後28日常温で養生し所定の高さからおも
りを落す衝撃テストを行なつた。落錘としては２
Kgのナス型のものを用いた。その結果は第１表の
通りであつた。
The present invention relates to the production of molded articles based on magnesia cement with improved water resistance. The hardened magnesia cement is dense and hard, and its mechanical properties, especially its bending strength, are superior to those of hardened portland cement, and by further reinforcing it with fibers, it can exhibit mechanical properties equivalent to those of organic plastics. . The nonflammability of magnesia cement compensates for the weaknesses of conventional organic plastics, making it extremely useful for disaster prevention. However, on the other hand, it has low water resistance, so despite its excellent physical properties, its wide range of use is limited, and its use outdoors or in places where it comes into contact with water is avoided. Methods to improve this water resistance have been considered for a long time.
A method of adding an additive that imparts water resistance to magnesia cement and a method of coating the surface of a cured magnesia cement with a material having water resistance have been proposed. In the surface coating method, the adhesion between the cured magnesia cement and the coating material is an important issue, and poor adhesion can cause interfacial peeling and reduced water resistance. Covering materials include Portland cement and alumina cement, which are nonflammable, inexpensive, and have good water resistance, and are effective as covering materials for improving the water resistance of magnesia cement. However, these materials have poor adhesion with magnesia cement. For example, when the magnesia cement composition contains magnesium chloride in Portland cent, it shows rapid setting due to the action of the eluted magnesium chloride, and the difference between magnesia cement and Portland cement. The interface becomes a weak layer, resulting in a composite with weak adhesive strength. In view of the above-mentioned current situation, the present invention has been made for the purpose of providing a method for manufacturing a magnesia cement composite that is nonflammable, has good mechanical strength, and has excellent water resistance. For excipients of magnesia cement curable composition,
The present invention relates to a method for producing a magnesia cement composite, which comprises heating and hardening a laminate in which heat-curing cement compositions made of alumina cement, gypsum, and lime are laminated. The magnesia cement curable composition in the present invention refers to a partially cured composition in which water is added and mixed with magnesia cement, and the composition is cured by heating or over time. The composition is then shaped into a plate, cylinder, or other desired shape. As the magnesia cement, conventionally known magnesia cement compositions containing activated magnesia and magnesium chloride and/or magnesium sulfate as main ingredients can be used, but in order to improve water resistance, magnesium phosphate tribasic and other compounds may be used. Preferably, it contains an insoluble phosphate. Furthermore, the above-mentioned magnesia cement hardening composition may contain fibers such as glass fibers, pine-like materials or woven materials made of such fibers, and various aggregates, fillers, etc. may be added to the magnesia cement hardening composition. It's okay. Next, the heat-curable cement composition of the present invention is an uncured composition which has the property of being hardened by heating, and is a mixture of conventional alumina cement, gypsum and lime, and water added thereto. As for the mixing ratio in the heat-curable cement composition, it is preferable to mix 40 to 60 parts by weight of alumina cement, 30 to 45 parts by weight of gypsum, and 10 to 15 parts by weight of lime. The amount of water used is preferably 40 to 65 parts by weight per 100 parts by weight of the total amount of alumina cement, gypsum and lime. Furthermore, it is also possible to add fibrous materials such as glass fibers to the above composition for reinforcement, and various aggregates, fillers, etc. can also be added. Further, the heat-curable cement composition has a curing speed adjusted when the composition is heated and cured,
It is preferable to add a hardening modifier to suppress too rapid hardening, and examples of the hardening modifier include phosphoric acid, phosphates such as hexametaphosphate and sodium pyrophosphate, citric acid, malic acid, gluconic acid, and glutaric acid. Examples thereof include acids, organic carboxylic acids such as glycolic acid, and organic carboxylic acid salts such as alkali metal salts of the above-mentioned organic carboxylic acids. Particularly suitable are alkali metal salts of citric acid. or,
The amount of hardening modifier used is alumina cement,
0.5 to 3 parts per 100 parts by weight of stone and lime
Parts by weight are preferred. In order to produce a composite by the method of the present invention, the magnesia cement curable composition is first shaped into a desired shape, and the heat curable cement composition is laminated on this shaped product to prepare a laminate. However, this lamination is usually performed by providing a relatively thin layer of a heat-curable cement composition on the surface of a molded article of a magnesia cement-curable composition by an appropriate method. Next, when the laminate prepared above is heated to usually 60°C or higher, it hardens and a magnesia cement composite is obtained. During this curing, it is preferable that the curing of both compositions proceed almost simultaneously, and for this purpose, it is preferable to adjust the curing speed of the heat-curing cement composition by adding a curing modifier. Further, it is preferable to leave the obtained magnesia cement composite for curing for several to several days. The magnesia cement composite obtained by the method of the present invention has a cement layer with excellent water resistance and good mechanical properties on the surface of a magnesia cement molded body, which is firmly bonded to the surface of the magnesia cement molded body. Therefore, it can be applied to applications requiring water resistance, such as water supply and drainage pipes, etc., where magnesia cement molded bodies have traditionally been difficult to apply, without causing the problem of surface layer peeling. The above-mentioned strong bond between the surface of the magnesia cement molded body and the surface layer is achieved for the first time in the present invention. For example, a thermosetting cement composition is laminated in layers on the surface of the molded and hardened magnesia cement molded body. However, methods such as heat curing do not produce such a strong bond. Although the reason why a strong bond with the surface layer is obtained in the present invention as described above is not clear in detail,
5Mgo―Mgcl 2゜H 2 O (W 5 type) and 3MgO―Mgcl 2・
Etrin guide ( 3CaO ・
It is speculated that the crystals formed from Al 2 O 3・3CaSO 4・32H 2 O) grow together with each other, resulting in a strong bond. The method for producing the magnesia cement composite of the present invention is as described above, in particular, applying a heat-curing cement composition comprising alumina cement, gypsum and lime to a molded magnesia cement curable composition, Since these are hardened by heating, it is possible to impart excellent water resistance to magnesia cement molded products, and the scope of application of these molded products can be expanded to applications that require water resistance. . The present invention will be explained below based on examples. Example 1 100 parts by weight of magnesium oxide, 30 parts by weight of magnesium chloride, 5 parts by weight of tertiary magnesium phosphate,
Mix 90 parts by weight of water, add 3% volume of glass fiber chops with a length of 25m/m, and cast into a 30cm x 30cm square mold.Additionally, as covering cement, 50 parts by weight of alumina cement and 30 parts of calcined gypsum. Part by weight, slaked lime
20 parts by weight and 1.5 parts by weight of sodium citrate, 50 parts by weight of water
Add and mix parts by weight, add and mix 3% by volume of glass fiber chops with a length of 13m/m, layer and cast on the same mold, heat and harden at 90℃, and magnesia cement 10
A composite with a thickness of 2 m/m and a coating cement of 2 m/m was obtained. After demolding, it was cured at normal temperature for 28 days and then subjected to an impact test by dropping a weight from a predetermined height. 2 as a falling weight
Kg eggplant type was used. The results were as shown in Table 1.
【表】
実施例 ２
酸化マグネシウム100重量部、硫酸マグネシウ
ム20重量部、第３リン酸マグネシウム３重量部、
水80重量部を混合し、30cm×30cm角の型に注型し
同時にガラスマツトを10重量％相当量マグネシア
セメントに含浸積層した。さらに被覆セメントと
してアルミナセメント50重量部、焼石膏35重量
部、消石灰15重量部及びクエン酸ソーダ1.5重量
部に水45重量部を加えて配合し、さらに長さ13
ｍ／ｍガラス繊維チヨツプを４容量％添加して混
合したのちマグネシアセメントの上に積層注型し
90℃に昇温硬化し、マグネシアセメント層10ｍ／
ｍ、被覆セメント層2.5ｍ／ｍの複合体を得た。
脱型後常温で28日間養生し衝撃テストを行なつ
た。落錘としては10ポンド（9.8Kg）のつるはし
型のものを用いた。その結果は第２表の通りであ
つた。[Table] Example 2 100 parts by weight of magnesium oxide, 20 parts by weight of magnesium sulfate, 3 parts by weight of tertiary magnesium phosphate,
80 parts by weight of water was mixed and cast into a 30 cm x 30 cm square mold, and at the same time glass mat was impregnated with magnesia cement in an amount equivalent to 10% by weight and laminated. Furthermore, 45 parts by weight of water was added to 50 parts by weight of alumina cement, 35 parts by weight of calcined gypsum, 15 parts by weight of slaked lime, and 1.5 parts by weight of sodium citrate as a coating cement, and further a length of 13 parts by weight was added.
After adding 4% by volume of m/m glass fiber chops and mixing, it was laminated and cast on top of magnesia cement.
Cured by heating to 90℃, magnesia cement layer 10m/
m, a composite with a covering cement layer of 2.5 m/m was obtained.
After demolding, it was cured at room temperature for 28 days and then subjected to an impact test. A 10-pound (9.8Kg) pickaxe-shaped drop weight was used. The results were as shown in Table 2.
【表】
比較例 １
酸化マグネシウム100重量部、塩化マグネシウ
ム40重量部、第３リン酸マグネシウム５重量部、
水90重量部を混合し、さらに長さ25ｍ／ｍガラス
繊維チヨツプ３容量％添加し、混合したのち90℃
に昇温硬化させた。脱型後常温で28日養生したの
ち、ポルトランドセメントを砂セメント比1.0、
水セメント比0.47で混合し、さらに長さ13ｍ／ｍ
ガラス繊維チヨツプを３容量％添加し混合したポ
ルトランドセメント配合物をマグネシアセメント
硬化体の表面に被覆し、28日間で常温硬化させて
マグネシアセメント層厚さ10ｍ／ｍ、ポルトラン
ドセメント層厚さ２ｍ／ｍの複合体を得た。この
複合体について実施例１と同様な衝撃テストを行
つた。その結果は第３表の通りであつた。[Table] Comparative Example 1 100 parts by weight of magnesium oxide, 40 parts by weight of magnesium chloride, 5 parts by weight of tribasic magnesium phosphate,
Mix 90 parts by weight of water, add 3% by volume of glass fiber chops with a length of 25 m/m, mix, and then hold at 90°C.
It was cured at elevated temperature. After demolding and curing at room temperature for 28 days, Portland cement was mixed with a sand-cement ratio of 1.0.
Mixed with a water-cement ratio of 0.47, and further length 13m/m
A Portland cement mixture mixed with 3% by volume of glass fiber chips was coated on the surface of the cured magnesia cement and cured at room temperature for 28 days to form a magnesia cement layer with a thickness of 10 m/m and a portland cement layer with a thickness of 2 m/m. The complex was obtained. The same impact test as in Example 1 was conducted on this composite. The results were as shown in Table 3.
【表】【table】
【表】
比較例 ２
酸化マグネシウム100重量部、硫酸マグネシウ
ム25重量部、第３リン酸マグネシウム３重量部、
水80重量部を混合し、実施例２と同様にガラスマ
ツトを10重量％積層し、90℃に昇温加熱し硬化脱
型後室温で28日間養生しマグネシアセメント基材
とした。次にアルミナセメントを砂比1.0、水比
0.45で配合し、さらにガラス繊維チヨツプ（13
ｍ／ｍ）を４容量％添加混合したアルミナセメン
ト配合物を上記マグネシアセメント基材上に被覆
して28日間室温で養生し試料とした。試料の厚み
はマグネシアセメントが10ｍ／ｍ、アルミナセメ
ント層が25ｍ／ｍであつた。この試料について実
施例１と同様な衝撃テストを行なつた。その結果
を第４表に示す。[Table] Comparative Example 2 100 parts by weight of magnesium oxide, 25 parts by weight of magnesium sulfate, 3 parts by weight of tertiary magnesium phosphate,
80 parts by weight of water was mixed, 10% by weight of glass mat was laminated in the same manner as in Example 2, heated to 90°C, hardened and demolded, and then cured at room temperature for 28 days to obtain a magnesia cement base material. Next, add alumina cement with a sand ratio of 1.0 and a water ratio of
0.45 and further glass fiber tips (13
An alumina cement mixture containing 4% by volume of m/m) was coated on the magnesia cement base material and cured at room temperature for 28 days to prepare a sample. The thickness of the sample was 10 m/m for the magnesia cement layer and 25 m/m for the alumina cement layer. The same impact test as in Example 1 was conducted on this sample. The results are shown in Table 4.
【表】
実施例 ３
実施例１及び実施例２のマグネシアセメント複
合体を90℃の温水中に12時間浸漬し、界面の接着
性をみたが変化はみられなかつた。
比較例 ３
比較例１及び比較例２のマグネシアセメント複
合体を90℃の温水中に12時間浸漬した。その結
果、マグネシアセメント層とセメント層間で剥離
が生じた。[Table] Example 3 The magnesia cement composites of Examples 1 and 2 were immersed in warm water at 90°C for 12 hours, and the adhesion of the interface was examined, but no change was observed. Comparative Example 3 The magnesia cement composites of Comparative Example 1 and Comparative Example 2 were immersed in 90°C hot water for 12 hours. As a result, peeling occurred between the magnesia cement layer and the cement layer.
Claims (1)
に、アルミナセメント、石こう及び石灰からなる
加熱硬化型セメント組成物を積層した積層物を加
熱して硬化せしめることを特徴とするマグネシア
セメント複合体の製造方法。 ２ 加熱硬化型セメント組成物における各成分の
配合量がアルミナセメント40〜60重量部、石こう
30〜45重量部、石灰10〜15重量部である第１項記
載の製造方法。 ３ 加熱硬化型セメント組成物に硬化調整剤が、
アルミナセメント、石こう及び石灰の合計量100
重量部に対し0.5〜３重量部含有されている第１
項記載の製造方法。[Claims] 1. A magnesia characterized by heating and curing a laminate obtained by laminating a heat-curable cement composition comprising alumina cement, gypsum, and lime on a molded magnesia cement-curable composition. Method of manufacturing cement composites. 2 The amount of each component in the heat-curing cement composition is 40 to 60 parts by weight of alumina cement, gypsum
30 to 45 parts by weight of lime and 10 to 15 parts by weight of the manufacturing method according to item 1. 3 A hardening modifier is added to the heat-setting cement composition,
Total amount of alumina cement, gypsum and lime 100
The first content is 0.5 to 3 parts by weight based on the weight part.
Manufacturing method described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4223280A JPS56140081A (en) | 1980-03-31 | 1980-03-31 | Manufacture of magnesia cement complex body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4223280A JPS56140081A (en) | 1980-03-31 | 1980-03-31 | Manufacture of magnesia cement complex body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56140081A JPS56140081A (en) | 1981-11-02 |
| JPH0112669B2 true JPH0112669B2 (en) | 1989-03-01 |
Family
ID=12630280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4223280A Granted JPS56140081A (en) | 1980-03-31 | 1980-03-31 | Manufacture of magnesia cement complex body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56140081A (en) |
-
1980
- 1980-03-31 JP JP4223280A patent/JPS56140081A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56140081A (en) | 1981-11-02 |
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