JPH11912A - Curing method of hydraulic extrusion-molded body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curing method, by which a crack and a warpage are prevented from developing at the end part of a hardened hydraulic extrusion- molded matter. SOLUTION: In a thermally curing method performed by stacking trays, on each of which a hydraulic extrusion-molded body is placed, the open part of the tray is sealed by a barrier material, the thermal conductivity of which is 0.04 kcal/m<2> .h. deg.C or higher so as to thermally cure the molded body under the condition that no air goes in and out within the tray.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、水硬性押し出し成
形体の養生硬化方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for curing and setting a hydraulic extruded product.

【０００２】[0002]

【従来の技術】従来、水硬性押し出し成形体は、押し出
し後の成形体の保形性や成形体のハンドリングの観点か
ら、押し出し機から押し出される成形体と同じ速度で移
動しているコンベア上のトレー上に引き取られる。その
後、これら押し出し成形体は、所定の長さに切断され、
段積みされた状態で水和反応を促進させ強度を向上させ
るため加温、加湿養生される。2. Description of the Related Art Conventionally, a hydraulically extruded molded product is formed on a conveyer moving at the same speed as a molded product extruded from an extruder from the viewpoints of shape retention of the extruded molded product and handling of the molded product. Taken on the tray. Thereafter, these extruded bodies are cut to a predetermined length,
It is heated and humidified to promote the hydration reaction and improve the strength in the stacked state.

【０００３】これらトレーを段積みした時、押し出し成
形体は外気に曝されているため、加温、加湿養生させる
までの間に成形体表面の乾燥が起こる。この表面乾燥に
より、押し出し成形体表面と内部の水分状態が変わって
しまう。この水分状態の変化は、硬化時の硬化収縮の不
均一の原因となり、押し出し成形体硬化物の表面にクラ
ックを発生させたり、著しい反りを引き起こす。クラッ
クの発生は製品の強度低下や歩留まり低下の原因とな
り、反りは平面性悪化による不良品の発生や寸法精度の
低下の原因となっていた。When these trays are stacked, since the extruded molded body is exposed to the outside air, the surface of the molded body is dried before heating and humidifying curing. Due to this surface drying, the state of moisture on the surface of the extruded product and the inside thereof change. This change in the water state causes uneven curing shrinkage during curing, causing cracks on the surface of the cured product of the extruded product, or significant warpage. The occurrence of cracks causes a decrease in the strength and the yield of the product, and the warpage causes the occurrence of defective products and a decrease in dimensional accuracy due to the deterioration of the flatness.

【０００４】これら加温加湿養生させるまでの間での押
し出し成形体の表面乾燥を防ぐ目的で、例えば特開平８
−２５２８１６号公報には、段積みした時のトレー両端
の開放部を防水フィルム等でシールする方法や段積みし
たトレー全体に箱形のカバーをかける方法が開示されて
いる。[0004] In order to prevent the surface of the extruded product from drying before heating and humidifying and curing, for example, Japanese Patent Application Laid-Open
Japanese Patent Application Publication No. 252816 discloses a method of sealing the open portions at both ends of the trays when they are stacked, with a waterproof film or the like, and a method of covering the entire stacked trays with a box-shaped cover.

【０００５】しかしながら、このようなトレー開放部を
密閉状態にする方法だけでは、トレーを段積みし加温養
生させた時、トレー内部の空間が断熱層として働いてし
まう。このため、段積みしたトレーの上下方向から熱が
伝わりにくくなり、トレー上の押し出し成形体の両端部
は長手方向中央部より昇温が速くなってしまい、そのた
め、押し出し成形体は長手方向での端部と中央部とで硬
化状態が大きく変化する結果、押し出し成形体の内部応
力増大を招き、押し出し成形体硬化物の端部にクラック
が発生したり端部の反りが大きくなる現象がおきるとい
う問題点があった。これらの現象のうち、クラックの発
生は強度低下や歩留まり低下、端部の反りの増大は平面
性悪化による寸法精度の低下の原因となっていた。[0005] However, if only such a method of closing the tray opening portion is used, when the trays are stacked and heated and cured, the space inside the trays acts as a heat insulating layer. For this reason, heat is difficult to be transmitted from the vertical direction of the stacked trays, and the temperature of the extruded body on the tray rises faster at both ends than at the center in the longitudinal direction. As a result of a large change in the hardened state between the end and the center, the internal stress of the extruded product is increased, and a crack occurs at the end of the extruded product and the phenomenon that the warpage of the end increases. There was a problem. Among these phenomena, the occurrence of cracks causes a decrease in strength and yield, and the increase in warpage at the end causes a decrease in dimensional accuracy due to deterioration in flatness.

【０００６】[0006]

【発明が解決しようとする課題】本発明は、段積みした
トレー上の成形体の養生時の長手方向中央部と端部の温
度差を小さくし、押し出し成形体硬化物の端部のクラッ
ク発生や端部の反りを防止することを目的とする。An object of the present invention is to reduce the temperature difference between the central portion and the end portion in the longitudinal direction during curing of the molded products on the stacked trays, and to generate cracks at the end portions of the extruded cured product. And to prevent warpage of the end.

【０００７】[0007]

【課題を解決するための手段】本発明者らは、前記の目
的を達成するために、鋭意研究を重ねた結果、本発明を
完成させた。Means for Solving the Problems The present inventors have made intensive studies in order to achieve the above object, and as a result, completed the present invention.

【０００８】すなわち本発明は、 （１）水硬性押し出し成形体をトレー上に載置、該トレ
ーを段積みして加温養生とする方法において、トレー開
放部を熱伝導率が０. ０４ｋｃａｌ／ｍ² ・ｈ・℃以上
である遮断壁材によりシールし、トレー内部に外気が出
入りしない状態で加温養生する事を特徴とする水硬性押
し出し成形体の養生硬化方法 に関する。That is, the present invention provides: (1) A method of placing a hydraulic extruded product on a tray and stacking the tray to heat and cure the tray, the heat conductivity of the open portion of the tray being 0.04 kcal / The present invention relates to a method of curing and hardening a hydraulically extruded molded product, which is sealed with a barrier wall material having a temperature of m ² · h · ° C. or more, and is heated and cured in a state in which outside air does not enter and exit inside the tray.

【０００９】[0009]

【発明の実施の形態】本発明に用いる遮断壁材の材質は
加温、加湿養生条件下で破損しないものであり、熱伝導
率が０. ０４ｋｃａｌ／ｍ² ・ｈ・℃以上、好ましくは
０．０５〜０．０９ｋｃａｌ／ｍ² ・ｈ・℃の遮断壁材
であれば特に制限はない。熱伝導率が０. ０４ｋｃａｌ
／ｍ² ・ｈ・℃より小さいと加温養生時の成形体端部と
中央部との温度差低減効果が少なくなり、端部のクラッ
ク発生防止や反りの低減等の効果がほとんど期待できな
くなる。BEST MODE FOR CARRYING OUT THE INVENTION The material of the barrier wall material used in the present invention is one which does not break under heating and humidifying curing conditions, and has a heat conductivity of 0.04 kcal / m ² · h · ° C. or more, preferably 0. There is no particular limitation as long as it is a blocking wall material of 0.05 to 0.09 kcal / m ² · h · ° C. Thermal conductivity is 0.04kcal
If it is less than / m ² · h · ° C., the effect of reducing the temperature difference between the end portion and the center portion of the molded body during the heating and curing is reduced, and the effects of preventing crack generation at the end portion and reducing warpage can hardly be expected. .

【００１０】用いうる遮断壁材の材質としては、発泡さ
せたポリスチレン、ポリウレタン等の樹脂やガラス繊
維、ロックウール等の無機繊維が例示される。これら、
遮断壁材は湿気や熱で変形しやすい事から金属板等でサ
ンドイッチ構造にするのが好ましい。また、遮断壁材の
水濡れによる断熱効果低減を防止する目的で遮断壁材に
防水シートを貼る等の防水加工をするのが好ましい。Examples of the material of the barrier wall material that can be used include expanded resins such as polystyrene and polyurethane, and inorganic fibers such as glass fiber and rock wool. these,
Since the barrier wall material is easily deformed by moisture or heat, it is preferable to adopt a sandwich structure using a metal plate or the like. Further, it is preferable to perform a waterproofing process such as attaching a waterproof sheet to the blocking wall material for the purpose of preventing the heat insulating effect from being reduced due to water wetting of the blocking wall material.

【００１１】これら遮断壁材により、両端の開放部をシ
ールする方法としては、トレーを段積みした後、トレー
両端部の開放部を断熱性遮断壁材によりシールしたり予
めトレー両端部を遮断壁材によりシールしておく等、ト
レーを段積みした時トレー内部が密閉状態となる方法で
あれば特に制限がない。As a method of sealing the open portions at both ends with these blocking wall materials, after stacking the trays, the open portions at both end portions of the tray are sealed with a heat insulating blocking wall material, or the both ends of the tray are previously sealed with a blocking wall. There is no particular limitation as long as the inside of the tray is sealed when the trays are stacked, such as by sealing with a material.

【００１２】本発明の養生硬化方法において水硬性押し
出し成形体の原料となる水硬性組成物は、無機系の物で
あれば特に制限はなく、セメント等の水硬性物質を主成
分として含有する組成物や高炉水砕スラグ等の潜在水硬
性物質及びその硬化刺激剤を主成分として含有する組成
物等が挙げられる。本発明の養生硬化方法においては、
水硬性押し出し成形体の押し出し方法、押し出し機やト
レーの種類等については特に制限がなく、セメント混練
物等を養生硬化し、硬化物を製造するのに通常に採用さ
れているものでよい。また、養生方法は熱伝導率が０.
０４ｋｃａｌ／ｍ² ・ｈ・℃以上である遮断壁材でシー
ルされたトレーを使用すること以外はセメント成形体を
養生硬化させるのに一般的に行われている方法が採用で
き特に制限はなく、通常３０〜１００℃で２〜６０時間
行えば充分である。In the curing and curing method of the present invention, the hydraulic composition to be used as a raw material of the hydraulic extruded product is not particularly limited as long as it is an inorganic material, and a composition containing a hydraulic material such as cement as a main component. And a latent hydraulic material such as granulated blast furnace slag and a composition containing a hardening stimulant thereof as a main component. In the curing method of the present invention,
There is no particular limitation on the method of extruding the hydraulic extruded product, the type of the extruder or the tray, and the one usually used for curing and kneading a cement kneaded product and producing a cured product may be used. The curing method has a thermal conductivity of 0.
Except for using a tray sealed with a barrier wall material of not less than 04 kcal / m ² · h · ° C., a method generally used for curing and curing a cement molded body can be adopted, and there is no particular limitation. Usually, it is sufficient to carry out at 30 to 100 ° C. for 2 to 60 hours.

【００１３】本発明の養生硬化方法は、トレー両端の開
放部に設けた遮断壁材が断熱材となるため、加温養生の
昇温時にトレー両端部からの熱の伝わりが遅くなり、ト
レー上下方向からの熱の伝わりと同じ状態となる。この
ため、加温養生時のトレー内部の温度分布が小さくな
る。これにより、トレー上にある押し出し成形体が均一
に加温される状態となり、硬化時の内部応力の発生を小
さくすることが出来る。このため、成形体端部のクラッ
クの発生防止や端部の反りの低減による平面性の向上と
なり、歩留まりや寸法精度の向上を図ることが出来る。In the curing and curing method of the present invention, since the insulating wall material provided at the open portions at both ends of the tray serves as a heat insulating material, the transfer of heat from both ends of the tray at the time of heating and heating increases, and It is in the same state as the transfer of heat from the direction. For this reason, the temperature distribution inside the tray during the heating and curing is reduced. As a result, the extruded product on the tray is uniformly heated, and the occurrence of internal stress during curing can be reduced. For this reason, the flatness is improved by preventing the occurrence of cracks at the end portions of the molded body and reducing the warpage of the end portions, and the yield and dimensional accuracy can be improved.

【００１４】[0014]

【実施例】以下、この発明に係わる実施例を説明する。Embodiments of the present invention will be described below.

【００１５】実施例１ ヒドロキシプロピルメチルセルロース（信越化学社製
品番：９０ＳＨ−４０００）１重量部、珪砂（平均粒径
１００μｍ）５０重量部、パーライト（三井金属鉱山社
製 品番：加工５号）２０重量部、ダンボール解砕パル
プ４重量部、ポルトランドセメント１００重量部をアイ
リッヒミキサーに投入し３分間混合した後、水３３重量
部を加えて更に１分間混合した。混合物をニーダールー
ダー型の混練機に入れ１０分間混練し粘土状の混合物を
得た。この混練物を真空押し出し成形機で７０mmHg以下
の減圧下で押し出し成形を行い、厚さ２０ｍｍ、幅５０
０ｍｍで板状の成形体を得た。得られた成形体を、予め
厚さ１０ｍｍの発泡ポリスチレンを、厚さ０. ３ｍｍの
ステンレス製鋼板でサンドイッチ構造とした遮断壁材
（熱伝導率；０. ０８ｋｃａｌ／ｍ² ・ｈ・℃）を両端
の開放部に溶接したステンレス製トレー（長さ３１５０
ｍｍ、幅７６０ｍｍ）上にとり、押し出し成形体を長さ
２９５０ｍｍに切断した。Example 1 Hydroxypropyl methylcellulose (manufactured by Shin-Etsu Chemical Co., Ltd.)
Part number: 90SH-4000) 1 part by weight, silica sand (average particle diameter 100 μm) 50 parts by weight, perlite (Mitsui Metal Mining Co., Ltd. Part No .: processing No. 5) 20 parts by weight, cardboard crushed pulp 4 parts by weight, Portland cement 100 parts by weight The mixture was added to an Erich mixer and mixed for 3 minutes, and then 33 parts by weight of water was added and further mixed for 1 minute. The mixture was put into a kneader-ruder type kneader and kneaded for 10 minutes to obtain a clay-like mixture. This kneaded material was extruded by a vacuum extruder under a reduced pressure of 70 mmHg or less to have a thickness of 20 mm and a width of 50 mm.
A plate-shaped molded body having a thickness of 0 mm was obtained. The obtained molded body was preliminarily combined with a 10 mm-thick expanded polystyrene and a 0.3 mm-thick stainless steel plate as a sandwich structure with a barrier wall material (thermal conductivity: 0.08 kcal / m ² · h · ° C.). Stainless steel trays (length 3150) welded to the open parts at both ends
mm, width 760 mm), and the extruded body was cut into a length of 2950 mm.

【００１６】上記と同様にして押し出し成形体を乗せた
トレー２９枚を段積みした後、押し出し成形体を乗せて
いないトレーを最上段に積み３０段とした。段積みした
トレーを加湿加温が可能な養生室に入れ、室温から８０
℃に４時間で昇温し、８０℃、飽和水蒸気圧の雰囲気下
で１６時間湿潤養生硬化させた。湿潤養生が終了し、養
生室内の温度を６０℃まで自然降温させ、段積みトレー
を養生室より取り出した後、押し出し成形体硬化物をト
レーと分離して、２９５０ｍｍ、幅５００ｍｍ、厚さ２
０ｍｍの押し出し成形硬化物（上から押し出し成形硬化
物Ａ−１〜Ａ−２９）を得た。In the same manner as described above, 29 trays on which the extruded products were placed were stacked, and then the trays on which no extruded products were placed were stacked on the uppermost stage to form 30 stages. Place the stacked trays in a curing room where humidification and heating are possible, and
The temperature was raised to 4 ° C. in 4 hours, and the composition was cured by wet curing at 80 ° C. in an atmosphere of saturated steam pressure for 16 hours. After the wet curing is completed, the temperature in the curing room is naturally lowered to 60 ° C., the stacking tray is taken out from the curing room, and the extruded cured product is separated from the tray to obtain 2950 mm, 500 mm in width and 2 mm in thickness.
Extruded cured products of 0 mm (extruded cured products A-1 to A-29 from above) were obtained.

【００１７】比較例１ 実施例１と同様の押し出し成形体を両端部に遮断壁材の
ない長さ３１５０ｍｍ、幅７００ｍｍのステンレス製ト
レー上にとり、押し出し成形体を長さ２９５０ｍｍに切
断した。押し出し成形体を乗せたトレー２９枚を段積み
した後、押し出し成形体を乗せていないトレーを最上段
に積み３０段とした。段積みした後、トレー両端の開放
部をポリプロピレン製のストレッチフィルムでシールし
た。段積みシールしたトレーを加湿加温が可能な養生室
に入れ、実施例と同じ条件で湿潤養生硬化を行った後、
養生室から取り出し、押し出し成形体硬化物をトレーと
分離して、長さ２９５０ｍｍ、幅５００ｍｍ、厚さ２０
ｍｍの押し出し成形硬化物（上から押し出し成形硬化物
Ｂ−１〜Ｂ−２９）を得た。Comparative Example 1 An extruded product similar to that of Example 1 was placed on a stainless steel tray having a length of 3150 mm and a width of 700 mm without barrier walls at both ends, and the extruded product was cut into a length of 2950 mm. After stacking 29 trays on which the extruded bodies were placed, the trays on which no extruded bodies were placed were stacked on the uppermost stage to form 30 stages. After stacking, the open portions at both ends of the tray were sealed with a polypropylene stretch film. After placing the sealed trays in a curing room where humidification and heating are possible, and after performing wet curing and curing under the same conditions as in the example,
After being taken out of the curing room, the extruded cured product was separated from the tray, and was 2950 mm long, 500 mm wide and 20 mm thick.
mm extruded cured products (extruded cured products B-1 to B-29 from above) were obtained.

【００１８】試験例１ 実施例１、及び比較例１で得られた押し出し成形硬化物
Ａ−１、Ａ−１０、Ａ−２０、Ａ−２９、Ｂ−１、Ｂ−
１０、Ｂ−２０、Ｂ−２９の反りの測定を行った。反り
の測定は段積みした時、各押し出し成形硬化物の長手方
向中央と端部に、押し出し方向と直交方向に長さ７５０
ｍｍのストレートエッジをあて、ストレートエッジ中央
部と押し出し成形硬化物との隙間に隙間ゲージを入れ測
定（ｍｍ）を行った。測定結果は表１の通りである。Test Example 1 The extruded and cured products A-1, A-10, A-20, A-29, B-1, and B- obtained in Example 1 and Comparative Example 1.
10, B-20, and B-29 were measured for warpage. The warpage was measured at the center and at the end in the longitudinal direction of each of the extruded cured products when they were stacked, with a length of 750 in the direction perpendicular to the extrusion direction.
A straight edge of mm was applied, and a gap gauge was inserted into a gap between the center of the straight edge and the extruded cured product to measure (mm). Table 1 shows the measurement results.

【００１９】[0019]

【表１】 表１ トレー段数 １ １０ ２０ ２９ 製造例押し出し成形試験物 Ａ−１ Ａ−１０ Ａ−２０ Ａ−２９ 反り（ｍｍ）中央部 １．８ ０．７ ０．８ ０．６ 端部 ２．０ ０．８ １．０ ０．９ 比較例押し出し成形試験物 Ｂ−１ Ｂ−１０ Ｂ−２０ Ｂ−２９ 反り（ｍｍ）中央部 １．６ ０．８ ０．９ ０．８ 端部 ３．９ １．８ ２．０ １．８Table 1 Number of tray stages 1 10 20 29 Production example Extrusion test specimen A-1 A-10 A-20 A-29 Warpage (mm) Central part 1.8 0.7 0.8 0.6 End part 2.0 0.8 1.0 0.9 Comparative Example Extrusion Test Specimen B-1 B-10 B-20 B-29 Warpage (mm) Center 1.6 1.6 0.9 0.9 0.8 End 3.9 1.8 2.0 1.8

【００２０】試験例２ 実施例、及び比較例で得られた押し出し成形物Ａ−１〜
Ａ−２９、Ｂ−１〜Ｂ−２９両端部のクラック発生状況
を観察した。観察は押し出し成形物表面の１０ｍｍ以上
のクラックを目視により行った。観察結果は表２の通り
である。Test Example 2 Extruded products A-1 to A-1 obtained in Examples and Comparative Examples
The occurrence of cracks at both ends of A-29 and B-1 to B-29 was observed. The observation was carried out by visually observing cracks of 10 mm or more on the surface of the extruded product. The observation results are as shown in Table 2.

【００２１】[0021]

【表２】 表２ クラック発生枚数（クラック発生試験体数／試験体数） 実施例 １／２９ 比較例 ２８／２９[Table 2] Table 2 Number of cracks generated (number of crack generation test pieces / number of test pieces) Example 1/29 Comparative Example 28/29

【００２２】表１及び２から明らかな様に本発明の養生
硬化方法によれば硬化物端部の反りの低減、両端部のク
ラック発生の防止をすることができる。As is clear from Tables 1 and 2, according to the curing method of the present invention, it is possible to reduce the warpage of the end of the cured product and to prevent the occurrence of cracks at both ends.

【００２３】[0023]

【発明の効果】本発明の養生硬化方法は、加温養生中で
の昇温時における、トレー内部の温度分布が小さくなる
事から、トレー上の押し出し成形体が均一に加温され、
硬化物の内部応力を低減することが出来る。従って、養
生後硬化物端部の反りを低減し、両端部のクラック発生
を防止することができ、寸法精度の向上、強度低下の防
止、歩留まりの向上を図ることができる。According to the curing and curing method of the present invention, the temperature distribution inside the tray at the time of raising the temperature during the heating and curing is reduced, so that the extruded product on the tray is heated uniformly.
The internal stress of the cured product can be reduced. Therefore, it is possible to reduce the warpage of the cured end of the cured product, prevent the occurrence of cracks at both ends, improve the dimensional accuracy, prevent the strength from decreasing, and improve the yield.

【図面の簡単な説明】[Brief description of the drawings]

【図１】実施例での加温加湿養生における昇温時の押し
出し成形体の端部と中央部の温度変化を示す図である。FIG. 1 is a diagram showing a temperature change at an end portion and a central portion of an extruded product at the time of temperature rise during heating and humidifying curing in Examples.

【図２】比較例での加温加湿養生における昇温時の押し
出し成形体の端部と中央部の温度変化を示す図である。FIG. 2 is a diagram showing a temperature change at an end portion and a center portion of an extruded body at the time of temperature rise during heating and humidifying curing in a comparative example.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】水硬性押し出し成形体をトレー上に載置、
該トレーを段積みして加温養生する方法において、トレ
ー開放部を熱伝導率が０. ０４ｋｃａｌ／ｍ² ・ｈ・℃
以上である遮断壁材によりシールし、トレー内部に外気
が出入りしない状態で加温養生する事を特徴とする水硬
性押し出し成形体の養生硬化方法。1. A hydraulic extruded product is placed on a tray,
In a method in which the trays are stacked and heated and cured, the open portion of the tray has a thermal conductivity of 0.04 kcal / m ² · h · ° C.
A method for curing and curing a hydraulic extruded body, characterized in that the extruded body is sealed with a blocking wall material and is heated and cured in a state where no outside air enters or exits the tray.