JPH0355190B2 - - Google Patents
Info
- Publication number
- JPH0355190B2 JPH0355190B2 JP18145787A JP18145787A JPH0355190B2 JP H0355190 B2 JPH0355190 B2 JP H0355190B2 JP 18145787 A JP18145787 A JP 18145787A JP 18145787 A JP18145787 A JP 18145787A JP H0355190 B2 JPH0355190 B2 JP H0355190B2
- Authority
- JP
- Japan
- Prior art keywords
- hydrogen peroxide
- cleaning
- concrete
- water
- contact
- 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
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 74
- 238000004140 cleaning Methods 0.000 claims description 47
- 238000000034 method Methods 0.000 claims description 23
- 150000001875 compounds Chemical class 0.000 claims description 13
- 239000007800 oxidant agent Substances 0.000 claims description 10
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 9
- 239000000460 chlorine Substances 0.000 claims description 9
- 229910052801 chlorine Inorganic materials 0.000 claims description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 5
- 235000011089 carbon dioxide Nutrition 0.000 claims description 5
- MMCOUVMKNAHQOY-UHFFFAOYSA-L oxido carbonate Chemical compound [O-]OC([O-])=O MMCOUVMKNAHQOY-UHFFFAOYSA-L 0.000 claims description 2
- 150000004977 peroxyborates Chemical class 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 23
- 239000004568 cement Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 10
- 239000004570 mortar (masonry) Substances 0.000 description 10
- 230000001464 adherent effect Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 239000004576 sand Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 229920003169 water-soluble polymer Polymers 0.000 description 5
- 229920000609 methyl cellulose Polymers 0.000 description 4
- 239000001923 methylcellulose Substances 0.000 description 4
- 235000010981 methylcellulose Nutrition 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 2
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 2
- 241001237745 Salamis Species 0.000 description 2
- 229920006243 acrylic copolymer Polymers 0.000 description 2
- 239000007900 aqueous suspension Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- -1 naphthalene sulfone Chemical class 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 235000015175 salami Nutrition 0.000 description 2
- 102000016938 Catalase Human genes 0.000 description 1
- 108010053835 Catalase Proteins 0.000 description 1
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 150000004680 hydrogen peroxides Chemical class 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- UFWIBTONFRDIAS-UHFFFAOYSA-N naphthalene-acid Natural products C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Detergent Compositions (AREA)
- Cleaning By Liquid Or Steam (AREA)
Description
〔産業上の利用分野〕
この発明は機器や配管などの壁面に付着してい
る残留生コンクリート（モルタル、セメントペー
ストを含む）を除去するための付着生コンクリー
トの洗浄除去方法、特に水溶性高分子化合物を添
加した付着生コンクリートの洗浄除去方法に関す
るものである。
〔従来の技術〕
コンクリート練りまぜ時に、メチルセルロー
ス、ヒドロキシエチルセルロース、ポリアクリル
アミド、アクリル系共重合体などの高分子系混和
剤を添加してコンクリートに粘着性を持たせるこ
とにより、水中に打設しても砂、砂利等の骨材の
分離がなく、正常なコンクリートが打設できる方
法が水中工事でとられている。このような生コン
クリートはモチ状で、粘着性が高いため、生コン
クリートプラント、生コンクリート車、コンクリ
ートポンプ車等の洗浄に手間と時間がかかつてい
る。
上記のような高分子系混和剤が添加された生コ
ンクリートは水中で分離しない性質を持つている
ため、通常の生コンクリートの場合のような水洗
いでは付着した生コンクリートを洗浄除去でき
ず、従来は次のような洗浄除去方法が行われてい
る。
骨材（砂利、砕石など）と水とを投入し、物
理的に剥離洗浄除去する。
高圧水で剥離洗浄除去する。
〔発明が解決しようとする問題点〕
しかしながら、上記従来法のうち、の方法で
は、例えばトラツクミキサー１台で30〜60分の洗
浄時間を要すなど、時間がかかるとともに、投入
骨材は生コンクリートが付着しているため、洗浄
再使用ができず、廃棄する必要があり、洗浄以外
に骨材廃棄の手間も加つてくる。このため人手、
骨材費、廃棄処分費など経費がかかるという問題
点がある。
またの方法では、高圧水の設備を新たに必要
とするほか、細部の洗浄が不完全になるととも
に、洗浄に手間と時間がかかるなどの問題点があ
る。
この発明は上記のような従来の問題点を解決す
るためのもので、機器や配管等の壁面に付着した
水溶性高分子化合物を含む生コンクリートを簡単
な装置と操作により、容易かつ完全に、短時間で
剥離除去できる付着生コンクリートの洗浄除去方
法を提案することを目的としている。
〔問題点を解決するための手段〕
本発明は、壁面に付着している生コンクリート
と、過酸化水素または過酸化水素を遊離する化合
物とを接触させることを特徴とする付着生コンク
リートの洗浄除去方法である。
本発明において「生コンクリート）とは、一般
に使用されている広義の概念で、狭義の生コンク
リートの他にモルタル、セメントペーストを含
む。
本発明において洗浄除去の対象とする付着生コ
ンクリートは、生コンクリートプラント、生コン
クリートミキサー、コンクリートポンプ、トラツ
クミキサー車などの機器や配管等の壁面に付着し
た残留生コンクリートであり、水溶性高分子化合
物を含むものが特に対象となるが、水溶性高分子
化合物を含まないものでもよい。生コンクリート
に添加される水溶性高分子化合物としては、メチ
ルセルロース、ヒドロキシエチルセルロース、ポ
リアクリルアミド、アクリル系共重合物などの増
粘効果のある物質が一般的であるが、ナフタレン
スルホン酸塩−ホルマリン縮合物、メラミンスル
ホン酸−ホルマリン縮合物などの流動化剤が併用
される場合もある。
これらの付着生コンクリートの洗浄除去に用い
る薬剤は、過酸化水素または過酸化水素を遊離す
る化合物（以下、両者を併せて「過酸化水素等」
という）である。過酸化水素を遊離する化合物と
しては、ペルオキシ炭酸塩、ペルオキシホウ酸塩
等の結晶水に相当する過酸化水素を有する過酸化
水素化物などがあげられる。
付着生コンクリートの洗浄除去方法は、壁面に
付着した生コンクリートと、上記過酸化水素等を
含む洗浄液を接触させる。洗浄液中の過酸化水素
等の濃度は0.1〜35重量％、好ましくは0.2〜10重
量％程度である。過酸化水素等は液状または粉状
で水に添加して洗浄液とする。過酸化水素等の濃
度が低い場合等にはカタラーゼを0.005〜0.65重
量％程度添加すると、効果は増大する。
壁面に付着した生コンクリートに上記洗浄液を
接触させ、ミキサーまたはポンプ等を回転させ
て、洗浄剤が万遍なく付着生コンクリートに接触
するようにすると、過酸化水素等がセメントのア
ルカリ成分より容易に分解し、発生した発生機の
酸素の酸化作用が著しいため、粘着性の生コンク
リートに含まれる水溶性高分子化合物が酸化分解
して、その粘着性が低下するとともに、酸化分解
の際に発生する酸素ガスの泡により、壁面より生
コンクリートが剥離して洗浄除去される。このと
き、必要に応じて削泡剤、分散剤等を併用しても
よい。
上記のように洗浄液を接触させた後、洗浄液を
排出し、壁面を水洗することにより、洗浄除去操
作は終了する。洗浄液中の過酸化水素等は酸素と
水を生成して無害な物質となるので、その処理は
容易である。
上記の洗浄除去操作の際、過酸化水素等との接
触の前または後に塩素系酸化剤と接触させると、
酸化作用が促進されるので好ましい。塩素系酸化
剤としては、次亜塩素酸塩、サラシ粉、高度サラ
シ粉などがある。塩素系酸化剤の洗浄液への添加
量は、0.1〜10重量％程度である。塩素系酸化剤
と過酸化水素等を混合すると発泡が起こるので、
塩素系酸化剤を過酸化水素等より前または後に洗
浄液に添加して接触させてもよいが、予め塩素系
酸化剤を含む洗浄剤を付着生コンクリートに接触
させて排出したのち、過酸化水素等を含む洗浄液
と接触させてさらに洗浄除去を行うこともでき
る。
また従来の砂の水懸濁液による物理的剥離に代
わる方法として、氷またはドライアイスの水懸濁
液を付着生コンクリートと接触させて撹拌を行
い、物理的に付着生コンクリートを剥離させ、洗
浄除去することができるが、この方法と過酸化水
素等による剥離方法を組合わせると、洗浄除去効
果が高くなる。前記氷またはドライアイスによる
方法は、粒径0.1〜３cmの氷またはドライアイス
を水に10〜50重量％懸濁させた洗浄液を付着生コ
ンクリートと接触させて撹拌する方法であるが、
この洗浄液に最初から、または途中から過酸化水
素等、あるいは過酸化水素等と塩素系酸化剤とを
添加して接触を行うことにより、氷またはドライ
アイスによる物理的な洗浄除去と、過酸化水素等
による化学的（物理的）な洗浄除去との相乗効果
により、洗浄除去効果は高くなる。この方法にお
ける過酸化水素等の添加量は前記と同量でよく、
氷が溶けて水が生成する場合は、氷、過酸化水素
等を追加することができる。
なお、本発明の方法は従来法などの他の洗浄法
との組合せも可能である。
〔発明の効果〕
本発明によれば、壁面に付着している生コンク
リートと、過酸化水素等とを接触させるようにし
たので、水溶性高分子化合物を含む粘着性の高い
付着生コンクリートでも、簡単な装置と操作によ
り、短時間で容易かつ完全に、低コストで洗浄除
去することができ、後処理も簡単である。
〔実施例〕
以下、本発明の実施例について説明する。
実施例１〜５、比較例１〜５
水／セメント比55％で、メチルセルロースをセ
メントに対して0.75重量％添加したセメントペー
ストを作り、500mlビーカに約50ｇを塗り付けた。
そして表１の各種薬剤を添加した洗浄液500mlを
前記ビーカに入れて150rpmで撹拌して洗浄除去
を行つた。所定時間後の洗浄率（％）を次式によ
り算出した結果を表１に示す。
洗浄率（％）＝洗浄前塗布量重量−洗浄後塗布量
重量／洗浄前塗布量重量×100
[Industrial Application Field] This invention relates to a method for cleaning and removing residual concrete (including mortar and cement paste) adhering to the walls of equipment, piping, etc. The present invention relates to a method for cleaning and removing adherent concrete to which a compound has been added. [Prior art] When mixing concrete, polymeric admixtures such as methylcellulose, hydroxyethylcellulose, polyacrylamide, and acrylic copolymers are added to make concrete sticky, which makes it possible to cast it in water. In underwater construction, there is no separation of aggregates such as sand and gravel, and normal concrete can be placed. Since such ready-mixed concrete is sticky and highly sticky, it takes time and effort to clean ready-mixed concrete plants, ready-mixed concrete trucks, concrete pump trucks, etc. Ready-mixed concrete to which the polymeric admixtures mentioned above have been added has a property that it does not separate in water, so the adhering ready-mixed concrete cannot be washed away by washing with water as is the case with ordinary ready-mixed concrete. The following cleaning and removal methods are used. Aggregate (gravel, crushed stone, etc.) and water are put in and physically separated and washed away. Remove and wash with high pressure water. [Problems to be Solved by the Invention] However, among the above conventional methods, method (1) is time-consuming, such as requiring 30 to 60 minutes of cleaning time with one track mixer, and the input aggregate is raw. Because it has concrete attached to it, it cannot be washed and reused and must be disposed of, which adds to the effort of disposing of the aggregate in addition to cleaning. For this reason, manpower,
There is a problem in that it requires expenses such as aggregate costs and disposal costs. In addition, this method requires new high-pressure water equipment, and has other problems, such as incomplete cleaning of small areas and time-consuming cleaning. This invention is intended to solve the above-mentioned conventional problems, and uses a simple device and operation to easily and completely remove ready-mixed concrete containing water-soluble polymer compounds that have adhered to the walls of equipment, piping, etc. The purpose of this study is to propose a method for cleaning and removing adhered concrete that can be peeled off in a short period of time. [Means for Solving the Problems] The present invention provides a method for cleaning and removing adhered fresh concrete, which is characterized by bringing fresh concrete attached to a wall surface into contact with hydrogen peroxide or a compound that liberates hydrogen peroxide. It's a method. In the present invention, "ready-mixed concrete" is a generally used broad concept that includes mortar and cement paste in addition to ready-mixed concrete in a narrow sense. Residual ready-mixed concrete adhering to the walls of equipment and piping of plants, ready-mixed concrete mixers, concrete pumps, truck mixers, etc., and contains water-soluble polymer compounds, is particularly targeted. Water-soluble polymer compounds added to fresh concrete are generally substances with thickening effects such as methylcellulose, hydroxyethylcellulose, polyacrylamide, and acrylic copolymers, but naphthalene sulfone A fluidizing agent such as an acid salt-formalin condensate or a melamine sulfonic acid-formalin condensate may also be used in combination.The agents used to clean and remove these adhered concrete are hydrogen peroxide or those that liberate hydrogen peroxide. Compounds (hereinafter referred to as "hydrogen peroxide, etc.")
). Examples of compounds that liberate hydrogen peroxide include hydrogen peroxides having hydrogen peroxide corresponding to water of crystallization, such as peroxycarbonate and peroxyborate. A method for cleaning and removing adherent fresh concrete is to bring the fresh concrete adhered to the wall surface into contact with a cleaning solution containing hydrogen peroxide or the like. The concentration of hydrogen peroxide, etc. in the cleaning solution is about 0.1 to 35% by weight, preferably about 0.2 to 10% by weight. Hydrogen peroxide and the like are added to water in liquid or powder form to make a cleaning solution. When the concentration of hydrogen peroxide or the like is low, the effect will be increased by adding about 0.005 to 0.65% by weight of catalase. When the cleaning solution is brought into contact with the fresh concrete that has adhered to the wall surface, and the mixer or pump is rotated so that the cleaning agent comes into contact with the fresh concrete evenly, hydrogen peroxide etc. can be easily absorbed by the alkaline components of cement. Due to the significant oxidizing effect of the oxygen generated by the generator during decomposition, the water-soluble polymer compounds contained in the sticky ready-mixed concrete are oxidized and decomposed, reducing its stickiness. Due to the oxygen gas bubbles, fresh concrete is peeled off from the wall surface and washed away. At this time, a defoamer, a dispersant, etc. may be used in combination, if necessary. After contacting with the cleaning liquid as described above, the cleaning liquid is discharged and the wall surface is washed with water, thereby completing the cleaning and removal operation. Hydrogen peroxide and the like in the cleaning solution generate oxygen and water and become harmless substances, so they can be easily disposed of. During the above cleaning and removal operation, if contact is made with a chlorine-based oxidizing agent before or after contact with hydrogen peroxide, etc.,
This is preferable because it promotes oxidation. Examples of chlorine-based oxidizing agents include hypochlorite, salami powder, and highly salami powder. The amount of the chlorine-based oxidizing agent added to the cleaning solution is about 0.1 to 10% by weight. Foaming occurs when chlorine-based oxidizers and hydrogen peroxide are mixed, so
A chlorine-based oxidizing agent may be added to the cleaning solution before or after hydrogen peroxide, etc., but the cleaning agent containing the chlorine-based oxidizing agent may be brought into contact with the adherent concrete and discharged, and then the hydrogen peroxide, etc. Further cleaning and removal can be carried out by contacting with a cleaning solution containing. In addition, as an alternative to the conventional physical peeling method using a water suspension of sand, an aqueous suspension of ice or dry ice is brought into contact with the adherent concrete and stirred to physically peel off the adherent concrete and then washed. However, if this method is combined with a peeling method using hydrogen peroxide or the like, the cleaning removal effect will be enhanced. The method using ice or dry ice is a method in which a cleaning solution in which ice or dry ice with a particle size of 0.1 to 3 cm is suspended in water at 10 to 50% by weight is brought into contact with the adherent concrete and stirred,
By adding hydrogen peroxide, etc., or hydrogen peroxide, etc. and a chlorine-based oxidizing agent to this cleaning solution from the beginning or during the process, it is possible to physically remove the hydrogen peroxide using ice or dry ice and to remove the hydrogen peroxide. Due to the synergistic effect with chemical (physical) cleaning and removal by such methods, the cleaning and removal effect becomes higher. The amount of hydrogen peroxide etc. added in this method may be the same as above,
If ice melts and produces water, ice, hydrogen peroxide, etc. can be added. Note that the method of the present invention can also be combined with other cleaning methods such as conventional methods. [Effects of the Invention] According to the present invention, since fresh concrete adhering to a wall surface is brought into contact with hydrogen peroxide, etc., even highly sticky fresh concrete containing a water-soluble polymer compound can be removed. With a simple device and operation, it can be easily and completely cleaned in a short period of time at low cost, and post-treatment is also simple. [Examples] Examples of the present invention will be described below. Examples 1 to 5, Comparative Examples 1 to 5 A cement paste was prepared by adding 0.75% by weight of methylcellulose to the cement at a water/cement ratio of 55%, and about 50g was spread in a 500ml beaker.
Then, 500 ml of the cleaning solution containing the various chemicals listed in Table 1 was added to the beaker and stirred at 150 rpm to remove the chemicals. Table 1 shows the results of calculating the cleaning rate (%) after a predetermined time using the following formula. Cleaning rate (%) = Weight of applied amount before cleaning - Weight of applied amount after cleaning / Weight of applied amount before cleaning x 100
【表】
表１の結果より、過酸化水素等による洗浄除去
効果が、他の酸化剤および砂による洗浄除去効果
より優れていることがわかる。
実施例 ６
実施例１〜５と同様のセメントペーストを塗り
付けたビーカに、高度サラシ粉５ｇと水50mlを入
れ、塗り付けたセメントペーストを万遍なく浸漬
した。10分後35重量％過酸化水素１mlと水50mlを
加え、再びセメントペーストを万遍なく浸漬し
た。５分後水でゆすいで洗浄除去を行つた結果、
洗浄率は99％であつた。
比較例 ６
実施例１〜５と同様のセメントペーストを塗り
付けたビーカに、高度サラシ粉５ｇと水500mlを
入れ、ジヤーテスタにより150rpmで15分間撹拌
したところ、洗浄率は40％であつた。
実施例 ７
実施例６において、高度サラシ粉の代りに、５
重量％次亜塩素酸ナトリウム溶液10mlを入れ、同
様に洗浄除去を行つた結果、洗浄率は95％であつ
た。
実施例 ８
30コンクリートミキサーで水／セメント比55
％、砂／セメント比２でメチルセルロースをセメ
ントに対して0.75重量％のモルタルを20練り、
モルタルを排出したところ、残留モルタルは約６
Kgであつた。これに高度サラシ粉100ｇを水２
に懸濁させて添加し、10分間ミキサー回転後、残
液を排出した。次に35重量％過酸化水素100mlお
よび水２を添加し、10分間回転した。10分後に
洗浄液を出し、水２を入れて３分間回転し、液
を排出後、ミキサー内部を観察したところ、付着
モルタルは完全に除去されていた。
実施例 ９
実施例８と同様にモルタルを練つて排出した
後、これに35重量％過酸化水素120mlと水480mlを
添加し、２〜３分間ミキサー回転後、最大粒径１
cmの氷２Kgと水２を投入して撹拌した。５分後
に排出して、コンクリートミキサー内部を観察し
た結果、ほぼ全面にわたつてモルタルは剥離除去
されていた。
比較例 ７
実施例８と同様にモルタルを練つて排出した
後、最大粒径１cmの氷２Kgと氷２を投入して撹
拌した。途中氷２Kgを追加して撹拌し、15分後に
排出して、コンクリートミキサー内部を観察した
結果、ほぼ全面にわたつてモルタルは剥離除去さ
れていた。
以上の結果より、過酸化水素等による洗浄除去
効果が他の酸化剤および砂による洗浄効果より優
れており、塩素系酸化剤または氷等による洗浄除
去と組合わせることにより、洗浄除去効果が増す
ことがわかる。[Table] From the results in Table 1, it can be seen that the cleaning removal effect using hydrogen peroxide etc. is superior to the cleaning removal effect using other oxidizing agents and sand. Example 6 Into a beaker coated with the same cement paste as in Examples 1 to 5, 5 g of highly refined powder and 50 ml of water were placed, and the coated cement paste was evenly immersed. After 10 minutes, 1 ml of 35% by weight hydrogen peroxide and 50 ml of water were added, and the cement paste was evenly immersed again. After 5 minutes, I rinsed it with water to remove it.
The cleaning rate was 99%. Comparative Example 6 When 5 g of highly refined powder and 500 ml of water were placed in a beaker coated with the same cement paste as in Examples 1 to 5 and stirred at 150 rpm for 15 minutes using a jar tester, the cleaning rate was 40%. Example 7 In Example 6, 5
10 ml of a wt% sodium hypochlorite solution was added and the cleaning was carried out in the same manner, resulting in a cleaning rate of 95%. Example 8 Water/cement ratio 55 in 30 concrete mixer
%, with a sand/cement ratio of 2, knead 20 mortar containing 0.75% by weight of methyl cellulose and cement.
When the mortar was discharged, the remaining mortar was approximately 6
It was Kg. To this, add 100g of highly refined powder and 2 parts of water.
After the mixer was rotated for 10 minutes, the remaining liquid was discharged. Next, 100 ml of 35% by weight hydrogen peroxide and 2 ml of water were added and rotated for 10 minutes. After 10 minutes, the cleaning liquid was removed, water 2 was added, and the mixer was rotated for 3 minutes. After draining the liquid, the inside of the mixer was observed, and it was found that the adhering mortar had been completely removed. Example 9 After kneading and discharging the mortar in the same manner as in Example 8, 120 ml of 35% hydrogen peroxide and 480 ml of water were added to it, and after rotating the mixer for 2 to 3 minutes, the maximum particle size was 1.
2 kg of ice and 2 kg of water were added and stirred. After 5 minutes, the concrete mixer was discharged and the inside of the concrete mixer was observed. As a result, the mortar had been peeled off and removed over almost the entire surface. Comparative Example 7 After kneading and discharging the mortar in the same manner as in Example 8, 2 kg of ice with a maximum particle size of 1 cm and 2 kg of ice were added and stirred. During stirring, 2 kg of ice was added and stirred, and after 15 minutes, it was discharged and the inside of the concrete mixer was observed. As a result, the mortar had been peeled off and removed over almost the entire surface. From the above results, the cleaning removal effect with hydrogen peroxide etc. is superior to the cleaning effect with other oxidizing agents and sand, and the cleaning removal effect is increased by combining it with cleaning removal with chlorine-based oxidizing agent or ice etc. I understand.
Claims (1)
化水素または過酸化水素を遊離する化合物とを接
触させることを特徴とする付着生コンクリートの
洗浄除去方法。 ２ 過酸化水素を遊離する化合物がペルオキシ炭
酸塩またはペルオキシホウ酸塩である特許請求の
範囲第１項記載の方法。 ３ 過酸化水素または過酸化水素を遊離する化合
物との接触の前または後に塩素系酸化剤との接触
を行う特許請求の範囲第１項または第２項記載の
方法。 ４ 過酸化水素または過酸化水素を遊離する化合
物との接触に際して氷またはドライアイスの塊り
による物理的な剥離を行う特許請求の範囲第１項
ないし第３項のいずれかに記載の方法。[Scope of Claims] 1. A method for cleaning and removing adhered concrete, which comprises bringing fresh concrete adhered to a wall surface into contact with hydrogen peroxide or a compound that liberates hydrogen peroxide. 2. The method according to claim 1, wherein the compound that liberates hydrogen peroxide is a peroxycarbonate or a peroxyborate. 3. The method according to claim 1 or 2, wherein the contact with a chlorine-based oxidizing agent is carried out before or after the contact with hydrogen peroxide or a compound that liberates hydrogen peroxide. 4. The method according to any one of claims 1 to 3, wherein physical peeling is performed using ice or dry ice chunks upon contact with hydrogen peroxide or a compound that liberates hydrogen peroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18145787A JPS6427678A (en) | 1987-07-21 | 1987-07-21 | Method of washing and removing attached ready-mixed concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18145787A JPS6427678A (en) | 1987-07-21 | 1987-07-21 | Method of washing and removing attached ready-mixed concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6427678A JPS6427678A (en) | 1989-01-30 |
| JPH0355190B2 true JPH0355190B2 (en) | 1991-08-22 |
Family
ID=16101094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18145787A Granted JPS6427678A (en) | 1987-07-21 | 1987-07-21 | Method of washing and removing attached ready-mixed concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6427678A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100723628B1 (en) * | 2006-04-07 | 2007-06-04 | 주식회사 서울아이씨 | Removing agent of remain concrete at form |
| JP5181196B2 (en) * | 2010-11-05 | 2013-04-10 | 新東産業株式会社 | Cleaning method for uncured cement composition handling equipment |
| JP7106308B2 (en) * | 2018-03-16 | 2022-07-26 | 光洋機械産業株式会社 | How to clean a concrete mixer |
-
1987
- 1987-07-21 JP JP18145787A patent/JPS6427678A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6427678A (en) | 1989-01-30 |
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