JPH0144662B2 - - Google Patents
Info
- Publication number
- JPH0144662B2 JPH0144662B2 JP55068226A JP6822680A JPH0144662B2 JP H0144662 B2 JPH0144662 B2 JP H0144662B2 JP 55068226 A JP55068226 A JP 55068226A JP 6822680 A JP6822680 A JP 6822680A JP H0144662 B2 JPH0144662 B2 JP H0144662B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- inorganic
- mortar
- salts
- concrete
- 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 25
- 238000000465 moulding Methods 0.000 claims description 15
- 239000002253 acid Substances 0.000 claims description 12
- 229910052806 inorganic carbonate Inorganic materials 0.000 claims description 11
- 150000003839 salts Chemical class 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 11
- 239000011083 cement mortar Substances 0.000 claims description 10
- 229910052920 inorganic sulfate Inorganic materials 0.000 claims description 9
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 229920003169 water-soluble polymer Polymers 0.000 claims description 7
- 239000011575 calcium Substances 0.000 claims description 5
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 12
- 239000004570 mortar (masonry) Substances 0.000 description 11
- 239000000292 calcium oxide Substances 0.000 description 6
- 235000012255 calcium oxide Nutrition 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
- 230000005484 gravity Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000005056 compaction Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 229920000609 methyl cellulose Polymers 0.000 description 2
- 239000001923 methylcellulose Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 235000011181 potassium carbonates Nutrition 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 1
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 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
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- -1 calcium aluminates Chemical class 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000000174 gluconic acid Substances 0.000 description 1
- 235000012208 gluconic acid Nutrition 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229960003975 potassium Drugs 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011736 potassium bicarbonate Substances 0.000 description 1
- 235000015497 potassium bicarbonate Nutrition 0.000 description 1
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- 229940086066 potassium hydrogencarbonate Drugs 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 239000000176 sodium gluconate Substances 0.000 description 1
- 235000012207 sodium gluconate Nutrition 0.000 description 1
- 229940005574 sodium gluconate Drugs 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
Description
本発明は、成形助剤及びこれを使用する成形体
の製法、特にセメントモルタル又はコンクリート
の成形助剤及びこれを用いたセメントモルタル又
はコンクリートを遠心成形して成形体を製造する
方法に関するものである。
従来から、ヒユーム管、コンクリートパイル、
コンクリートポール、ライニング管などのセメン
トモルタル又はコンクリートの遠心成形体は、回
転台上に型枠を置いて、セメント等の成形原料を
投入振付し、高速回転させながら締固めて製造し
ているが、この方法には次のような欠点がある。
(1) 高速回転させて前記のものを製造する際に、
高音を発するので騒音公害となる。
(2) 原料の遠心締固性が悪いので、遠心成形に時
間がかかり、特に大口径になるに従つてこの傾
向が強く、レイタンスを除去しながら締固める
必要がある。
(3) 厚手管の場合は多層成形を必要とする。
(4) 特にライニング鉄管の場合、管端部が損傷し
やすいので、その補修に多大の人手を要する。
出願人は、これらの欠点を解決した遠心成形体
の製法、すなわちオキシカルボン酸及び／又はそ
の塩類と無機炭酸塩とを存在させた急硬性セメン
トモルタル又はコンクリートを遠心成形すること
を提案したが（特開昭55−42221号）、この方法
は、成形体内面に骨材が露出するので、仕上げ用
のセメントペースト又はモルタルを投入し、遠心
しながら均し棒により表面が平滑になるまで均
し、その後、高速回転して締固めをするという仕
上げ作業が必要であつた。
本発明は、この問題点を解決することを目的と
するもので、前記物質にさらに水溶性高分子物質
を併用し、遠心成形時間の短縮や回転数の低減、
内面仕上げ作業の省略などの成形能率をさらに向
上させた成形助剤と成形体の製法を提供しようと
するものである。
すなわち、本発明は、オキシカルボン酸及び／
又はその塩類と無機炭酸塩並びに水溶性高分子物
質からなるセメントモルタル又はコンクリートの
成形助剤、及びカルシウムアルミネート又はカル
シウムハロアルミネートと無機硫酸塩を含有する
急硬性セメントに、オキシカルボン酸及び／又は
その塩類と無機炭酸塩とを存在させたセメントモ
ルタル又はコンクリートを遠心成形するにあた
り、急硬性セメントに対し0.005〜１％の水溶性
高分子物質を添加することを特徴とする。
本発明におけるオキシカルボン酸とその塩類と
は、例えば、グルコン酸、クエン酸、酒石酸及び
これらのナトリウム、カリウム、アンモニウムの
塩などがあげられ、これらを単独又は併用したも
のである。また無機炭酸塩としては、炭酸ナトリ
ウム、炭酸カリウム、炭酸アンモニウム、炭酸水
素ナトリウム、炭酸水素カリウムなどの塩があげ
られ、これらを単独又は併用したものを意味す
る。
オキシカルボン酸及び／又はその塩類と、無機
炭酸塩の割合が重要であり、前者が５〜40％に対
して後者が95〜60％である。オキシカルボン酸及
び／又はその塩類が５％未満ではセメントが異常
凝結することがあり、また40％を超えるとセメン
トの水和が阻害され、特に短期の強度発現が悪く
なる。オキシカルボン酸及び／又はその塩類と無
機炭酸塩の使用量は、両者の合計量として、セメ
ントに対し0.1〜５％、好ましくは0.2〜３％程度
である。
また本発明における水溶性高分子物質として
は、ポリビニルアルコール、酢酸セルローズ、で
ん粉等があげられ、水に溶解して均一にセメント
中に分散し保水性を高めブリージングを少なくす
る機能を有するもので、セメントの水和を阻害し
ない物質であればどのようなものでも差支えはな
い。これらの使用量はセメントに対して0.005〜
１％、好ましくは0.01〜0.5％である。0.005％未
満では表面を平滑にする効果が十分でなく、また
１％をこえて添加しても効果は向上せず、反つて
モルタル又はコンクリートの流動性を低下させ、
セメントの水和を著しく遅延することとなる。
第２番目の発明は、市販の急硬セメントに、前
記成形助剤を添加して、蒸気養生なしで成形能率
を高め、かつ遠心成形体端部の損傷を防止する方
法である。
本発明法で使用する急硬性セメントは、カルシ
ウムアルミネート又はこれにハロゲン元素が固溶
したカルシウムハロアルミネート（以下、カルシ
ウムアルミネート等という。）と無機硫酸塩を含
有したものであるが、そのカルシウムアルミネー
ト等は例えば生石灰とボーキサイトの混合原料又
はこれらにハロゲン化物を添加したものを高温で
熱処理することによつて得られる。これら原料を
溶融したものを急冷すると、Ｘ線回析では実質的
にピークを示さない無定形物が得られるが、この
無定形物は結晶形物に比べて短時間の強度発現に
すぐれているので、それだけレイタンスの発生防
止と遠心成形体端部の損傷防止に役立つ。特に、
カルシウムアルミネート等のCaO含有量が33〜47
％を含有するものは本発明な好適なものであり、
そのCaO含有量が35％より少いものは、短時間の
強度発現が十分でないので、これらを防止する効
果が小さく、また47％を超える含有量は凝結時間
が極端に短かく、作業性が低下する。最も好まし
いCaO含有量は38〜45％である。この粉末度はブ
レーン値で2000cm2／ｇもあれば十分であるが、
3000〜6000cm2／ｇが好ましい粒度である。
無機硫酸塩としては、二水、半水、無水の各種
石コウ類が使用できるが、型無水石コウの不溶
性または難溶性のものが適当である。これらの無
機硫酸塩の粉末度は、ブレーン値で2000cm2／ｇ以
上、特に4000〜8000cm2／ｇの範囲が好適である。
カルシウムアルミネート等100部に対する無機
硫酸塩の割合は100〜300部が好ましい。無機硫酸
塩が100部よりも少ないと凝結時間が早く、かつ
強度発現も悪い。また300部を超えると凝結時間
はのびるが強度発現が遅くなる。好ましい無機硫
酸塩の割合は150〜250部である。
またこのようなカルシウムアルミネート等と無
機硫酸塩からなる急硬性無機粉末のセメントに対
する配合量は、５〜25％が適当であり、この範囲
を逸脱すると短時間の強度発現が悪くなるか、さ
もなくば添加量に比例して強度発現が少なく不経
済となる。好ましい配合量は８〜20％である。
この急硬性無機粉末が添加されるセメントとし
ては、各種ポルトランドセメントやこれにシリカ
やフライアツシユ、高炉スラツグ等を混合したセ
メントが用いられる。
急硬性セメントに対する成形助剤の添加量は、
オキシカルボン酸及び／又はその塩類と、無機炭
酸塩との合計量として0.1〜５％、好ましくは0.2
〜３％である。0.1％以下では効果少なく、また
５％以上では凝結開始が遅延され過ぎる。また水
溶性高分子物質は急硬性セメントに対し、0.005
〜１％、好ましくは0.01〜0.5％である。
以上説明したように、本発明の成形助剤を含有
するセメントモルタル又はコンクリートを使用
し、遠心力によつて成形体を製造すると次のよう
ないろいろな利点がある。特に鉄管内面をセメン
トモルタルやコンクリートで遠心成形する場合
は、その効果は大きい。
(1) ライニング時間が従来のライニングの1/2〜
１／３以下ですむ。
(2) ライニングされたモルタルが５〜60分程度の
間で、任意の時間で凝結するので、ライニング
後の管の移動が自由にできるようになる。
(3) 蒸気養生を必要とせずに短時間で出荷強度に
達する。
(4) ライニング管端部の損傷すなわち亀裂、剥離
の発生がない。
(5) ライニング内面の特別な仕上げは必要ない。
次に実施例をあげて本発明を説明する。
なお、本明細書に記載の％及び部はいずれも重
量基準で示した。
実施例 １
普通セメント100部、天然砂230部、水及び第１
表の組成を有する成形助剤を練り混ぜてモルタル
を製造した。尚、オキシカルボン酸としてはクエ
ン酸(A)とグルコン酸ナトリウム(B)、無機炭酸塩と
しては炭酸カリウム（Ｋ）と炭酸ナトリウム
（Ｎ）及び水溶性高分子物質としてはメチルセル
ロース（MC）「メトローズSM−1500」とポリビ
ニルアルコール（PVA「デンカPVA Ｂ−17−
Ｓ」を用いた。成形助剤中、オキシカルボン酸と
無機炭酸塩は混練り水に溶解し、水溶性高分子物
質をセメントにブレンドして使用した。モルタル
のフロー値は200±20mmであつた。
これらのモルタルをφ1ｍ×１ｍ鉄管内面に重
力倍数５で回転させながら厚さ７mmのモルタル層
を形成させ、さらに回転をあげて重力倍数30で２
分間遠心し一旦回転を止め脱水スラリーをかき出
し、再び回転を重力倍数30にあげて２分間遠心し
たところ、実験No.１〜４の成形助剤を使用したも
のはライニング表面全体にペースト層が形成さ
れ、砂の露出がなく平滑な表面肌で十分な硬さに
締固められていた。この製管所要時間は８分であ
り、これを蒸気養生して製品とした。尚、製管状
態を第１表に併記する。
一方、実験No.５の成形助剤を用いたモルタル
は、重力倍数30で２分間遠心し、一旦回転を止め
脱水スラリーをかき出したところ、ライニング表
面に砂が露出し凹凸面が内面に現われ目的とする
ペースト層は全く形成されなかつた。そこで、
Ｗ／Ｃ＝30％のセメントペースト10Kgを投入し、
再び重力倍数５で回転させながら均し棒で表面が
平滑になるまで均した後、回転数を上げて重力倍
数20で２分間遠心締固めし、表面の凸凹を1.5mm
とした。この製管所要時間は13分であり、実験No.
１〜４に比べ５分間余計に時間を費やした。
The present invention relates to a molding aid and a method for producing a molded article using the same, particularly a molding aid for cement mortar or concrete, and a method for manufacturing a molded article by centrifugally molding cement mortar or concrete using the same. . Traditionally, hume pipes, concrete piles,
Cement mortar or concrete centrifugal moldings such as concrete poles and lining pipes are manufactured by placing a formwork on a rotating table, adding forming raw materials such as cement, and compacting it while rotating at high speed. This method has the following drawbacks. (1) When manufacturing the above items by rotating at high speed,
They emit high-pitched sounds and cause noise pollution. (2) Since the centrifugal compaction of the raw material is poor, centrifugal compaction takes time, and this tendency is particularly strong as the diameter increases, so it is necessary to compact while removing laitance. (3) Multi-layer molding is required for thick pipes. (4) Especially in the case of lined iron pipes, the ends of the pipes are easily damaged and require a lot of manpower to repair. The applicant proposed a method for producing a centrifugally molded product that solved these drawbacks, namely, centrifugally molding a rapidly hardening cement mortar or concrete in which oxycarboxylic acid and/or its salts and inorganic carbonate were present ( (Japanese Patent Application Laid-open No. 55-42221), this method exposes the aggregate on the inner surface of the molded body, so cement paste or mortar for finishing is added and the surface is leveled with a leveling rod while centrifuging until the surface is smooth. After that, it was necessary to perform finishing work by rotating at high speed and compacting it. The present invention aims to solve this problem, and uses a water-soluble polymer substance in addition to the above-mentioned substance to shorten the centrifugal molding time, reduce the number of rotations,
The object of the present invention is to provide a molding aid and a method for producing a molded article that further improves molding efficiency, such as by omitting inner surface finishing work. That is, the present invention provides oxycarboxylic acids and/or
oxycarboxylic acid and/or its salts, inorganic carbonates, and cement mortar or concrete forming aids made of water-soluble polymeric substances, and rapid hardening cements containing calcium aluminates or calcium haloaluminates and inorganic sulfates. In centrifugally forming cement mortar or concrete in which salts thereof and inorganic carbonate are present, the method is characterized by adding 0.005 to 1% of a water-soluble polymer substance to the rapidly hardening cement. Examples of the oxycarboxylic acid and its salts in the present invention include gluconic acid, citric acid, tartaric acid, and their sodium, potassium, and ammonium salts, and these may be used alone or in combination. Examples of inorganic carbonates include salts such as sodium carbonate, potassium carbonate, ammonium carbonate, sodium hydrogen carbonate, and potassium hydrogen carbonate, which may be used alone or in combination. The ratio of oxycarboxylic acid and/or its salts to inorganic carbonate is important, with the former being 5-40% and the latter being 95-60%. If the content of oxycarboxylic acid and/or its salts is less than 5%, the cement may set abnormally, and if it exceeds 40%, the hydration of the cement will be inhibited, resulting in poor short-term strength development in particular. The amount of oxycarboxylic acid and/or its salts and inorganic carbonate to be used is about 0.1 to 5%, preferably about 0.2 to 3%, based on the cement. In addition, water-soluble polymer substances in the present invention include polyvinyl alcohol, cellulose acetate, starch, etc., which have the function of dissolving in water and uniformly dispersing in cement to increase water retention and reduce bleeding. Any substance may be used as long as it does not inhibit the hydration of cement. The amount of these used is 0.005 to cement
1%, preferably 0.01-0.5%. If it is less than 0.005%, the effect of smoothing the surface will not be sufficient, and if it is added more than 1%, the effect will not improve, but it will warp and reduce the fluidity of mortar or concrete.
This will significantly retard cement hydration. The second invention is a method for increasing molding efficiency without steam curing and preventing damage to the ends of centrifugal compacts by adding the above-mentioned forming aid to commercially available quick-hardening cement. The rapid hardening cement used in the method of the present invention contains calcium aluminate or calcium haloaluminate in which a halogen element is solidly dissolved (hereinafter referred to as calcium aluminate, etc.) and an inorganic sulfate. Calcium aluminate and the like can be obtained, for example, by heat-treating a mixed raw material of quicklime and bauxite or a mixture of these with a halide added thereto at a high temperature. When these raw materials are molten and rapidly cooled, an amorphous material that shows virtually no peaks in X-ray diffraction is obtained, but this amorphous material exhibits superior strength in a short period of time compared to crystalline materials. Therefore, this helps in preventing the occurrence of laitance and damage to the ends of the centrifugal molded body. especially,
CaO content such as calcium aluminate is 33-47
% is preferred according to the present invention,
If the CaO content is less than 35%, short-term strength development is insufficient, so the effect of preventing these problems is small, and if the CaO content exceeds 47%, the setting time is extremely short, resulting in poor workability. descend. The most preferred CaO content is 38-45%. A Blaine value of 2000 cm 2 /g is sufficient for this fineness, but
A preferred particle size is 3000-6000 cm 2 /g. As the inorganic sulfate, various types of dihydrate, semi-aqueous, and anhydrous gypsum can be used, but insoluble or sparingly soluble anhydrite-type gypsum is suitable. The fineness of these inorganic sulfates is preferably 2000 cm 2 /g or more in Blaine value, particularly in the range of 4000 to 8000 cm 2 /g. The ratio of the inorganic sulfate to 100 parts of calcium aluminate, etc. is preferably 100 to 300 parts. When the amount of inorganic sulfate is less than 100 parts, the setting time is fast and the strength development is also poor. Moreover, if the amount exceeds 300 parts, the setting time will be extended, but the strength development will be delayed. The preferred proportion of inorganic sulfate is 150 to 250 parts. In addition, the appropriate amount of rapidly hardening inorganic powder made of calcium aluminate, etc. and inorganic sulfate in cement is 5 to 25%; if it deviates from this range, short-term strength development may deteriorate or Without it, the strength development will be less in proportion to the amount added and it will be uneconomical. The preferred amount is 8 to 20%. As the cement to which this rapidly hardening inorganic powder is added, various Portland cements and cements mixed with silica, fly ash, blast furnace slag, etc. are used. The amount of forming aid added to rapid hardening cement is
The total amount of oxycarboxylic acid and/or its salts and inorganic carbonate is 0.1 to 5%, preferably 0.2
~3%. If it is less than 0.1%, the effect will be small, and if it is more than 5%, the onset of coagulation will be delayed too much. In addition, water-soluble polymer substances have a 0.005
-1%, preferably 0.01-0.5%. As explained above, when a molded article is produced by centrifugal force using cement mortar or concrete containing the forming aid of the present invention, there are various advantages as follows. This is especially effective when centrifugally forming the inner surface of a steel pipe with cement mortar or concrete. (1) Lining time is 1/2 that of conventional lining
It takes less than 1/3. (2) Since the lined mortar solidifies at any time between about 5 and 60 minutes, the tube can be moved freely after lining. (3) Reach shipping strength in a short time without requiring steam curing. (4) There is no damage to the end of the lining pipe, i.e., no cracking or peeling. (5) No special finishing of the inner surface of the lining is required. Next, the present invention will be explained with reference to Examples. Note that all percentages and parts described in this specification are expressed on a weight basis. Example 1 100 parts of ordinary cement, 230 parts of natural sand, water and
A mortar was manufactured by kneading a molding aid having the composition shown in the table. The oxycarboxylic acids include citric acid (A) and sodium gluconate (B), the inorganic carbonates include potassium carbonate (K) and sodium carbonate (N), and the water-soluble polymer substances include methylcellulose (MC) and ``Metrose''. SM-1500" and polyvinyl alcohol (PVA "Denka PVA B-17-
"S" was used. In the forming aid, oxycarboxylic acid and inorganic carbonate were dissolved in kneading water, and a water-soluble polymer substance was blended with cement. The mortar flow value was 200±20 mm. These mortars were rotated on the inner surface of a φ1 m x 1 m iron pipe at a gravity multiple of 5 to form a 7 mm thick mortar layer, and then the rotation was further increased to form a 7 mm thick mortar layer at a gravity multiple of 30.
After centrifuging for one minute, stopping the rotation and scraping out the dehydrated slurry, increasing the rotation to a gravity multiplier of 30 and centrifuging for two minutes, a paste layer was formed on the entire lining surface for those using the molding aids of Experiments Nos. 1 to 4. It had been compacted to a sufficient hardness with no exposed sand and a smooth surface. The required time for making this pipe was 8 minutes, and it was steam-cured to produce a product. The tube manufacturing conditions are also listed in Table 1. On the other hand, the mortar using the molding aid in Experiment No. 5 was centrifuged at a gravity multiple of 30 for 2 minutes, and when the rotation was stopped and the dehydrated slurry was scraped out, sand was exposed on the lining surface and an uneven surface appeared on the inner surface. No paste layer was formed at all. Therefore,
Add 10 kg of cement paste with W/C = 30%,
After leveling the surface with a leveling rod again while rotating at a gravity factor of 5 until it becomes smooth, the rotation speed was increased and centrifugal compaction was performed for 2 minutes at a gravity factor of 20 to reduce the unevenness of the surface by 1.5 mm.
And so. The time required for making this pipe was 13 minutes, and the time required for this pipe production was 13 minutes.
It took an extra 5 minutes compared to 1 to 4.
【表】
実施例 ２
実験No.２の成形助剤を用いたモルタルにおい
て、普通セメントのかわりに、CaO43％含有のカ
ルシウムアルミネート又はカルシウムハロアルミ
ネートの無定形物に対して２重量倍量の型無水
石コウを混合してなるブレーン4500cm2／ｇの急硬
性無機粉末を普通セメントに13％配合したセメン
トを用いた以外は同様にしてライニングを行なつ
た。その結果、蒸気養生をしなくてもライニング
表面全体にペースト層を形成し、平滑な表面肌で
十分な硬さに締固められた製品が得られた。
なお、このモルタルにつき４×４×16cm供試体
の20℃における圧縮強度を測定したところ、材令
１日で201Kg／cm2、７日で403Kg／cm2であつた。[Table] Example 2 In the mortar using the molding aid of Experiment No. 2, instead of ordinary cement, 2 times the weight of calcium aluminate or calcium haloaluminate containing 43% CaO was added to the amorphous material. Lining was carried out in the same manner except that a cement containing 4500 cm 2 /g of rapidly hardening inorganic powder mixed with type anhydrite and 13% of ordinary cement was used. As a result, a paste layer was formed on the entire lining surface without steam curing, and a product with a smooth surface and sufficient hardness was obtained. Furthermore, when the compressive strength of a 4×4×16 cm specimen of this mortar at 20° C. was measured, it was 201 Kg/cm 2 after 1 day of age and 403 Kg/cm 2 after 7 days.
Claims (1)
炭酸塩並びに水溶性高分子物質からなるセメント
モルタル又はコンクリートの成形助剤。 ２ カルシウムアルミネート又はカルシウムハロ
アルミネートと無機硫酸塩を含有する急硬性セメ
ントに、オキシカルボン酸及び／又はその塩類と
無機炭酸塩とを存在させたセメントモルタル又は
コンクリートを遠心成形するにあたり、急硬性セ
メントに対し0.005〜１重量％の水溶性高分子物
質を添加することを特徴とする成形体の製法。[Claims] 1. A cement mortar or concrete forming aid comprising an oxycarboxylic acid and/or its salts, an inorganic carbonate, and a water-soluble polymeric substance. 2. When centrifugally molding cement mortar or concrete in which oxycarboxylic acid and/or its salts and inorganic carbonate are present in rapidly hardening cement containing calcium aluminate or calcium haloaluminate and inorganic sulfate, rapid hardening A method for producing a molded article, which comprises adding 0.005 to 1% by weight of a water-soluble polymer substance to cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6822680A JPS56164050A (en) | 1980-05-22 | 1980-05-22 | Formation aid and manufacture of formed body therewith |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6822680A JPS56164050A (en) | 1980-05-22 | 1980-05-22 | Formation aid and manufacture of formed body therewith |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56164050A JPS56164050A (en) | 1981-12-16 |
| JPH0144662B2 true JPH0144662B2 (en) | 1989-09-28 |
Family
ID=13367674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6822680A Granted JPS56164050A (en) | 1980-05-22 | 1980-05-22 | Formation aid and manufacture of formed body therewith |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56164050A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6016843A (en) * | 1983-07-05 | 1985-01-28 | 電気化学工業株式会社 | Mortar, concrete efflorescence preventing agent |
| JPS62278156A (en) * | 1986-05-27 | 1987-12-03 | 電気化学工業株式会社 | Vapor curing cement composition |
| US6106608A (en) * | 1995-03-31 | 2000-08-22 | Andree; Gerd | Floor patching and leveling compound and associated method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4950017A (en) * | 1972-09-14 | 1974-05-15 | ||
| JPS5168628A (en) * | 1974-12-12 | 1976-06-14 | Denki Kagaku Kogyo Kk | KYOKOSEISEMENTOTENKAZAI |
| JPS5213521A (en) * | 1975-07-24 | 1977-02-01 | Sanyo Kokusaku Pulp Co | Intimate mixing agent for mortar or plaster |
| JPS5242815A (en) * | 1975-09-27 | 1977-04-04 | Sumitomo Chem Co Ltd | Process for preparation of carboxylic acid esters |
| JPS5294319A (en) * | 1976-02-03 | 1977-08-08 | Denki Kagaku Kogyo Kk | Lining method |
| JPS5426829A (en) * | 1977-08-01 | 1979-02-28 | Tokuyama Soda Co Ltd | Adhesive composition |
| JPS5542221A (en) * | 1978-09-14 | 1980-03-25 | Denki Kagaku Kogyo Kk | Molding aid and manufacture of molded body thereby |
-
1980
- 1980-05-22 JP JP6822680A patent/JPS56164050A/en active Granted
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4950017A (en) * | 1972-09-14 | 1974-05-15 | ||
| JPS5168628A (en) * | 1974-12-12 | 1976-06-14 | Denki Kagaku Kogyo Kk | KYOKOSEISEMENTOTENKAZAI |
| JPS5213521A (en) * | 1975-07-24 | 1977-02-01 | Sanyo Kokusaku Pulp Co | Intimate mixing agent for mortar or plaster |
| JPS5242815A (en) * | 1975-09-27 | 1977-04-04 | Sumitomo Chem Co Ltd | Process for preparation of carboxylic acid esters |
| JPS5294319A (en) * | 1976-02-03 | 1977-08-08 | Denki Kagaku Kogyo Kk | Lining method |
| JPS5426829A (en) * | 1977-08-01 | 1979-02-28 | Tokuyama Soda Co Ltd | Adhesive composition |
| JPS5542221A (en) * | 1978-09-14 | 1980-03-25 | Denki Kagaku Kogyo Kk | Molding aid and manufacture of molded body thereby |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56164050A (en) | 1981-12-16 |
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