JPH01172248A - Production of cement composition for extrusion molding - Google Patents
Production of cement composition for extrusion moldingInfo
- Publication number
- JPH01172248A JPH01172248A JP62327263A JP32726387A JPH01172248A JP H01172248 A JPH01172248 A JP H01172248A JP 62327263 A JP62327263 A JP 62327263A JP 32726387 A JP32726387 A JP 32726387A JP H01172248 A JPH01172248 A JP H01172248A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- weight
- parts
- composition
- cold water
- 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.)
- Pending
Links
- 239000004568 cement Substances 0.000 title claims abstract description 36
- 239000000203 mixture Substances 0.000 title claims abstract description 32
- 238000001125 extrusion Methods 0.000 title claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000003365 glass fiber Substances 0.000 claims abstract description 11
- 239000003513 alkali Substances 0.000 claims abstract description 9
- 239000004014 plasticizer Substances 0.000 claims abstract description 8
- 238000004898 kneading Methods 0.000 claims abstract description 5
- 239000004576 sand Substances 0.000 abstract description 4
- 239000010425 asbestos Substances 0.000 description 12
- 229910052895 riebeckite Inorganic materials 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 230000020169 heat generation Effects 0.000 description 7
- 238000000465 moulding Methods 0.000 description 5
- 235000012438 extruded product Nutrition 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229920000609 methyl cellulose Polymers 0.000 description 3
- 239000001923 methylcellulose Substances 0.000 description 3
- 235000010981 methylcellulose Nutrition 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- -1 for example Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000010893 paper waste Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 206010058467 Lung neoplasm malignant Diseases 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 208000005718 Stomach Neoplasms Diseases 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 206010017758 gastric cancer Diseases 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 201000005202 lung cancer Diseases 0.000 description 1
- 208000020816 lung neoplasm Diseases 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 201000011549 stomach cancer Diseases 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/002—Water
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Ventilation (AREA)
- Air Conditioning Control Device (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野 ）
本発明は押出成形用セメント組成物の製造法に関し、よ
り詳細には、毒性のあるアスベストを含有せず、成形性
、表面平滑性等の特性に優れた押出成形用セメント組成
物を製造する方法に関するものである。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for producing a cement composition for extrusion molding, and more specifically, it does not contain toxic asbestos and has good moldability, surface smoothness, etc. The present invention relates to a method for producing a cement composition for extrusion molding with excellent properties.
（従来技術及びその問題点 ）
従来、セメントと骨材との混合物に、可塑性を与えるた
めのメチルセルロース等の可塑性付与剤及び耐衝撃性を
向上するためのガラス繊維を添加し、更に１表面平滑性
を与えるためにアスベストを混入した組成物に適量の水
を添加して混練したセメント組成物を、押出成形した後
、養生硬化させて種々の建材が製造されている。(Prior art and its problems) Conventionally, a plasticizer such as methylcellulose to impart plasticity and glass fiber to improve impact resistance are added to a mixture of cement and aggregate, and one layer of surface smoothness is added to the mixture. Various building materials are manufactured by extrusion molding a cement composition made by adding an appropriate amount of water to a composition mixed with asbestos and kneading the mixture to give asbestos, and then curing and curing the composition.
このようなセメント組成物は、押出成形性が良く、これ
から製造された成形製品は、曲げ強度、衝撃強度等の機
械的性質も十分であり、表面平滑性も優れている。Such a cement composition has good extrusion moldability, and molded products manufactured from it have sufficient mechanical properties such as bending strength and impact strength, and have excellent surface smoothness.
しかしながら、このようなセメント組成物に混入されて
いるアスベストは毒性を有する（肺ガンや胃ガン等の発
生源になると報告されている）ものであることが近年明
らかとなり、アスベスト含有セメント組成物の製造中に
、アスベストの粉塵を吸い込むことによって作業者の健
康が著しく害される危険のあることが明らかとなった。However, in recent years, it has become clear that asbestos mixed in such cement compositions is toxic (reported to be a source of lung cancer, stomach cancer, etc.), and asbestos-containing cement compositions are During manufacturing, it became clear that inhaling asbestos dust poses a serious health risk to workers.
したがって、上記従来のアスベスト含有セメント組成物
は、物性において優れているものの、許容し難い重大な
欠点を有している。Therefore, although the above-mentioned conventional asbestos-containing cement compositions have excellent physical properties, they have serious drawbacks that are unacceptable.
またアスベストを配合しないセメント組成物に関しても
種々検討されているが、かかるセメント組成物は押出成
形性や強度等の特性において不満足なものである。Various studies have also been conducted on cement compositions that do not contain asbestos, but such cement compositions are unsatisfactory in terms of extrudability, strength, and other properties.
（問題点を解決するための手段 ）
本発明者は、アスベスト無配合のセメント組成物につい
て鋭意検討した結果、アスベストに代えて適量のバルブ
を配合し、且つ１０℃以下の冷水を加えて混練すること
によって、上述した問題点が解決することを見出した。(Means for Solving the Problems) As a result of intensive studies on cement compositions that do not contain asbestos, the inventor of the present invention has found that an appropriate amount of valve is mixed in place of asbestos, and cold water of 10°C or less is added and kneaded. It has been found that the above-mentioned problems can be solved by this.
即ち１本発明の押出成形用セメント組成物の製造法は、
セメント １００重量部、
耐アルカリガラス繊維 ｌ乃至５重量部、バルブ ｌ乃
至６重量部。That is, 1. The method for producing a cement composition for extrusion molding of the present invention includes: 100 parts by weight of cement, 1 to 5 parts by weight of alkali-resistant glass fiber, and 1 to 6 parts by weight of bulb.
骨材 ｌＯ乃至１００重量部、
可塑性付与剤 ｌ乃至３重量部、
から成る組成物に、１０℃以下の冷水を適量加えて混練
することを特徴とする。It is characterized in that an appropriate amount of cold water of 10° C. or lower is added to a composition consisting of 10 to 100 parts by weight of aggregate and 1 to 3 parts by weight of a plasticizer and kneaded.
（作用）
本発明においては、アスベストに代えてバルブを配合し
、且つ１０℃以下の冷水を適量加えて混練することによ
って、表面平滑性等の特性が保持され、しかも押出成形
性や強度が顕著に改善される。(Function) In the present invention, properties such as surface smoothness are maintained, and extrudability and strength are remarkable by blending bulb instead of asbestos and adding an appropriate amount of cold water below 10°C and kneading. will be improved.
即ち、セメント組成物は水と混練して水和させることに
よって硬化するものであるが、水和に際して発熱を伴う
ために、増粘や成形不良、及び成形物の強度低下の問題
があり、この傾向はアスベスト無配合の組成物について
特に顕著となっている。That is, cement compositions harden by being kneaded with water and hydrated, but hydration is accompanied by heat generation, which causes problems such as thickening, poor molding, and reduced strength of molded products. The trend is particularly pronounced for asbestos-free compositions.
本発明によれば、配合水として１０℃以下の冷水を用い
ることによって発熱が有効に抑制され、この発熱に起因
する成形不良、増粘及び強度低下等の問題が有効に解決
されるものと認められる。According to the present invention, it has been recognized that heat generation is effectively suppressed by using cold water of 10°C or less as the compounding water, and problems such as poor molding, thickening, and strength reduction caused by this heat generation are effectively solved. It will be done.
（発明の好鴻な態様 ）
本発明において用いるセメントとしては、ポルトランド
セメント、高炉スラグセメント、アルミナセメント、フ
ライアッシェセメント、硫酸塩セメント等のそれ自体公
知の種々のセメントを使用することができる。(Advantageous Embodiments of the Invention) As the cement used in the present invention, various cements known per se such as Portland cement, blast furnace slag cement, alumina cement, fly asche cement, and sulfate cement can be used.
また耐アルカリガラス繊維は、押出成形品の強度を保持
するために配合されるものであり、セメント１００重量
部当たりｌ乃至５重量部、特に３乃至５重量部の割合で
配合される。The alkali-resistant glass fiber is blended in order to maintain the strength of the extruded product, and is blended at a ratio of 1 to 5 parts by weight, particularly 3 to 5 parts by weight, per 100 parts by weight of cement.
このガラス繊維の配合量が上記範囲よりも少ない場合に
は、押出成形品の強度が低下し、また上記範囲よりも多
い場合には組成物の成形性が低下する。If the amount of glass fiber blended is less than the above range, the strength of the extruded product will be reduced, and if it is more than the above range, the moldability of the composition will be reduced.
この耐アルカリガラス繊維としては、特に耐アルカリ性
が改良されたガラス繊維、例えばミネロン［（株）アル
カ−製部品］が使用される。As this alkali-resistant glass fiber, glass fiber with particularly improved alkali resistance, such as Mineron (manufactured by Alka Co., Ltd.), is used.
また本発明においては、アスベストの代わりにバルブを
使用する。Also, in the present invention, a valve is used instead of asbestos.
このバルブは、押出成形物に表面平滑性を付与するため
に用いられるものであり、針葉樹及び広葉樹等を素材と
する天然バルブや合成バルブ等のそれ自体公知のバルブ
は全て使用することができ、例えば古紙バルブも使用す
ることができる。This valve is used to impart surface smoothness to the extruded product, and all known valves such as natural valves and synthetic valves made of softwood and hardwood can be used. For example, waste paper valves can also be used.
本発明においてこのバルブは、セメント１００重量部当
たりｌ乃至６重量部、特に３乃至６重量部の割合で配合
され、この範囲よりも多量に配合すると押出成形物の強
度が低下し、また少量の場合には表面平滑性が不満足な
ものとなる。In the present invention, this valve is blended at a ratio of 1 to 6 parts by weight, particularly 3 to 6 parts by weight, per 100 parts by weight of cement. In some cases, the surface smoothness becomes unsatisfactory.
また押出成形物の寸法安定化及び軽量化のために、骨材
が配合される。In addition, aggregate is added to the extruded product in order to stabilize its dimensions and reduce its weight.
この骨材としては、川砂、珪砂、パーライト等のタイラ
ー標準篩１６メツシユ以下の通常の骨材が使用される。As this aggregate, ordinary aggregates such as river sand, silica sand, perlite, etc. having a size of 16 meshes or less on a Tyler standard sieve are used.
骨材の使用量は、セメント１００重量部当たりｌＯ乃至
１００重量部、特にｌＯ乃至５０重量部の割合で配合さ
れる。この範囲よりも多量に配合されると、押出成形性
及び成形品の曲げ強度が低下し、上記範囲よりも少ない
場合には５寸法安定性が不十分なものとなり、また軽量
化を図ることができない。The amount of aggregate used is 10 to 100 parts by weight, particularly 10 to 50 parts by weight, per 100 parts by weight of cement. If the amount is more than this range, the extrudability and bending strength of the molded product will decrease, and if it is less than the above range, the five-dimensional stability will be insufficient, and it will be difficult to achieve weight reduction. Can not.
また、可塑性付与剤としては、例えば、ポリビニルアル
コール、ポリエチレングリコール、ポリプロピレングリ
コール、及びメチルセルロース、カルボキシメチルセル
ロースの如きセルロース誘導体、並びにポリアクリルア
ミド等が使用される。この可塑性付与剤の使用量は、セ
メントｌ［ｌ。Further, as the plasticizer, for example, polyvinyl alcohol, polyethylene glycol, polypropylene glycol, cellulose derivatives such as methyl cellulose and carboxymethyl cellulose, and polyacrylamide are used. The amount of this plasticizer used is 1 [l] of cement.
重量部当たりｌ乃至３重量部、特にｌ乃至２重量部の割
合である。The proportion is 1 to 3 parts by weight, especially 1 to 2 parts by weight per part by weight.
本発明の製造法によれば、上記のセメント、耐アルカリ
ガラス繊維、パルプ、骨材、及び可塑性付与剤を乾燥状
態で十分に混合し、これに１０℃以下、特に５℃以下の
冷水を適量加えて混練することによって行なわれる。According to the manufacturing method of the present invention, the above cement, alkali-resistant glass fiber, pulp, aggregate, and plasticizer are sufficiently mixed in a dry state, and an appropriate amount of cold water of 10°C or lower, particularly 5°C or lower is added to the mixture. This is done by adding and kneading.
即ち、この様な冷水を用いることによって、水和に際し
ての発熱を有効に抑制することが可能となり、発熱に起
因する成形不良、増粘及び強度低下等の不都合が有効に
回避されるのである。That is, by using such cold water, it is possible to effectively suppress heat generation during hydration, and problems such as poor molding, thickening, and strength reduction caused by heat generation can be effectively avoided.
例えば、１バツチ当たり１００Ｉ２の水を使用する場合
において、５℃の水を用いたときには、２０℃の水を用
いたときに比して、
１ （ｋｃａｌ／ｋｇｌ ｘ １００（１００（（２０
−５１＝１５００（ｋｃａｌ）の熱量を配合組成物から
奪い取ることができ、発熱を有効に抑制、することが可
能となるのである。For example, when using 100 I2 of water per batch, when using water at 5°C, compared to when using water at 20°C, 1 (kcal/kgl x 100 (100 ((20
-51=1500 (kcal) of heat can be taken away from the blended composition, making it possible to effectively suppress heat generation.
この場合、冷水の代わりに氷塊を用いることも考えられ
るが、氷塊を液状とするためには少なくとも８０ ｋｃ
ａｌ／ｋｇの融解熱が必要となるので、外気温が低い場
合には、氷塊が溶解していない状態で押出機中に入る可
能性がある。In this case, it may be possible to use ice cubes instead of cold water, but in order to make the ice cubes liquid, at least 80 kc is required.
Since a heat of fusion of al/kg is required, if the outside temperature is low, there is a possibility that the ice block will enter the extruder in an unmelted state.
従って、氷塊の温度や粒度等を考慮して外気温を調整す
る必要がある。Therefore, it is necessary to adjust the outside temperature by considering the temperature and particle size of the ice blocks.
一方、本発明によれば、冷水を用いているため、この様
な相変化を考慮する必要はないので、特に外気温の調整
を図る必要はなく、安定したロングラン成形を行なうこ
とが可能となる。On the other hand, according to the present invention, since cold water is used, there is no need to consider such a phase change, so there is no need to particularly adjust the outside temperature, and stable long-run molding can be performed. .
本発明において、冷水との混線は、例えば２軸スクリユ
ーとシリンダーとからなる混線部を備えたそれ自体公知
の押出機を用いて行なうことができ、この様な押出機を
用いて、それ自体公知の方法によって所望の形状を有す
る成形品に成形することができる。。In the present invention, mixing with cold water can be carried out using, for example, an extruder known per se that is equipped with a mixing section consisting of a twin screw and a cylinder. A molded article having a desired shape can be formed by the following method. .
また冷水の配合量は、各成分の配合量や押出成形条件に
よっても異なるが、一般にセメント１００重量部に対し
て２０乃至１００重量部の範囲内であることが好適であ
る。Although the amount of cold water to be blended varies depending on the blending amount of each component and the extrusion molding conditions, it is generally preferable to be within the range of 20 to 100 parts by weight per 100 parts by weight of cement.
（発明の効果 ）
かかる本発明によれば、アスベスト無配合のセメント組
成物を、成形不良及び強度低下等の不都合を生ずること
なく、有効に製造することが可能となる。(Effects of the Invention) According to the present invention, it is possible to effectively produce an asbestos-free cement composition without causing inconveniences such as poor molding and reduced strength.
（実施例 ）
下記処方、
セメ ン ト ： 普通ポルトランドセメント
１００ 重量部耐アルカリガラス 繊維 ＝
３重量部ミネロン［（株）
アルド 製］
バルブ： ＬＢＫＰ又は古紙 ６重量部骨材＝５
号珪砂 ５０重量部可塑性付与剤：メチ
ルセルロース ２重量部に従い、これら成分を
乾燥状態でニーグーを用いて十分混合し、これに５℃、
１０℃、１５℃及び２０℃の水をそれぞれ添加し、混練
して押出成形用セメント組成物を製造した。(Example) The following formulation, cement: Ordinary Portland cement
100 parts by weight alkali-resistant glass fiber =
3 parts by weight Mineron [Co., Ltd.
Made by Aldo] Valve: LBKP or waste paper 6 parts by weight aggregate = 5
Silica sand No. 50 parts by weight Plasticity imparting agent: Methyl cellulose 2 parts by weight These ingredients were thoroughly mixed in a dry state using a Nigu, and then heated at 5°C.
Water at 10°C, 15°C, and 20°C was added and kneaded to produce a cement composition for extrusion molding.
この場合、５℃及び１０℃の水を添加したときには、押
出機の発熱が有効に抑制され、成形性が向上してロング
ランが可能となったが、１５℃及び２０℃の水を添加し
たときには、成形性が悪くロングランが困難であった。In this case, when water at 5°C and 10°C was added, heat generation in the extruder was effectively suppressed, moldability was improved, and long runs were possible, but when water at 15°C and 20°C was added, However, the moldability was poor and long runs were difficult.
Claims (2)
することを特徴とする押出成形用セメント組成物の製造
法。(1) 100 parts by weight of cement, 1 to 5 parts by weight of alkali-resistant glass fiber, 1 to 6 parts by weight of pulp, 10 to 100 parts by weight of aggregate, and 1 to 3 parts by weight of plasticizer, at 10°C. A method for producing a cement composition for extrusion molding, which comprises adding and kneading an appropriate amount of the following cold water.
項記載の製造法。(2) Claim 1, in which the temperature of the cold water is 5°C or less
Manufacturing method described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62327263A JPH01172248A (en) | 1987-12-25 | 1987-12-25 | Production of cement composition for extrusion molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62327263A JPH01172248A (en) | 1987-12-25 | 1987-12-25 | Production of cement composition for extrusion molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01172248A true JPH01172248A (en) | 1989-07-07 |
Family
ID=18197163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62327263A Pending JPH01172248A (en) | 1987-12-25 | 1987-12-25 | Production of cement composition for extrusion molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01172248A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2735415A1 (en) * | 1995-06-15 | 1996-12-20 | Mci Sa | METHOD FOR MANUFACTURING A PLATE-SHAPED ARTICLE AND ARTICLE MANUFACTURED |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50123128A (en) * | 1974-03-15 | 1975-09-27 | ||
| JPS61229509A (en) * | 1985-04-05 | 1986-10-13 | 株式会社大林組 | Cooling device for water for mixing concrete |
-
1987
- 1987-12-25 JP JP62327263A patent/JPH01172248A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50123128A (en) * | 1974-03-15 | 1975-09-27 | ||
| JPS61229509A (en) * | 1985-04-05 | 1986-10-13 | 株式会社大林組 | Cooling device for water for mixing concrete |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2735415A1 (en) * | 1995-06-15 | 1996-12-20 | Mci Sa | METHOD FOR MANUFACTURING A PLATE-SHAPED ARTICLE AND ARTICLE MANUFACTURED |
| WO1997000161A1 (en) * | 1995-06-15 | 1997-01-03 | Materiaux De Construction International (M.C.I. S.A.) | Method for making a plate-like article, and resulting article |
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