JPH0635352B2 - Construction method for preventing deterioration of cement-based materials - Google Patents
Construction method for preventing deterioration of cement-based materialsInfo
- Publication number
- JPH0635352B2 JPH0635352B2 JP61002994A JP299486A JPH0635352B2 JP H0635352 B2 JPH0635352 B2 JP H0635352B2 JP 61002994 A JP61002994 A JP 61002994A JP 299486 A JP299486 A JP 299486A JP H0635352 B2 JPH0635352 B2 JP H0635352B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- concrete
- aqueous solution
- based material
- mat
- 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 - Lifetime
Links
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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/4505—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements characterised by the method of application
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Building Environments (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は，セメント系材料表面層の劣化防止又は劣化し
たセメント系材料表面層の補修のために，これらセメン
ト系材料表面に施される処理剤含浸施工法の改良に関す
る。特に，本発明の施工方法は，コンクリートのアルカ
リ骨材反応による劣化，鉄筋コンクリートの鉄筋の発錆
による劣化等の防止及びこれらにより劣化したコンクリ
ートの補修に用いられる。TECHNICAL FIELD The present invention relates to impregnation of a treatment agent applied to the surface of a cement-based material surface to prevent deterioration of the cement-based material surface layer or repair of the deteriorated cement-based material surface layer. Regarding improvement of construction method. In particular, the construction method of the present invention is used to prevent deterioration of concrete due to alkali-aggregate reaction, deterioration of reinforced concrete due to rusting of reinforcing bars, and repair of deteriorated concrete.
従来の技術 セメント，モルタル，コンクリート等の硬化物は，自然
環境下次第に表面から劣化が進行することはよく知られ
ている。特に腐食性金属材料が埋め込まれた，例えば，
鉄筋コンクリート等セメント系材料では，上記劣化が進
行すると内部の金属材料に錆が発生し，コンクリートに
クラックが生じるに至る。また，アルカリ骨材反応を起
こす骨材が配合されたコンクリートでは，アルカリ骨材
反応の進行につれて，コンクリートの膨張が起り，やは
りコンクリートにクラックが生じる。Conventional technology It is well known that hardened materials such as cement, mortar, and concrete gradually deteriorate from the surface in the natural environment. Especially when corrosive metal material is embedded, for example,
In cement-based materials such as reinforced concrete, when the above-mentioned deterioration progresses, rust occurs in the metal material inside and cracks occur in the concrete. Further, in the concrete in which the aggregate that causes the alkali-aggregate reaction is mixed, the expansion of the concrete occurs as the alkali-aggregate reaction progresses, and the concrete also cracks.
このようなセメント系材料の劣化を防ぎ，また，劣化し
たセメント系材料の補修方法として，特開昭６０−１０
８３８５号に珪酸アルカリと亜硝酸塩を含有する水溶液
をセメント系材料の表面に，ローラー，刷毛，スプレー
等による方法で塗布することにより表面から含浸処理す
る方法が提案されている。As a method for preventing such deterioration of the cement-based material and repairing the deteriorated cement-based material, JP-A-60-10
No. 8385 proposes a method of impregnating the surface of a cement-based material by applying an aqueous solution containing alkali silicate and nitrite onto the surface of the cement-based material by a method such as a roller, brush or spray.
更に，特開昭５９−６４５８２号公報には，セメント系
材料表面から内部へ珪酸アルカリ水溶液を加圧含浸させ
る方法が開示されている。Further, Japanese Patent Laid-Open No. 59-64582 discloses a method of pressure-impregnating an alkaline silicate aqueous solution from the surface of a cement-based material to the inside.
発明が解決しようとする問題点 特開昭６０−１０８３８５号公報に記載の如き塗布法に
よっては，処理剤水溶液は，セメント系材料表面から内
部深くまでは浸透し難く，そのために，セメント系材料
の劣化防止を長期間持続せしめ難い。同公報に例示の如
く浸透を助勢する物質を更に加えた処理剤も用いられる
が，かゝる処理剤によっても浸透深さを格段に向上せし
めることができない。これに対し，特開昭５９−６４５
８２号公報に示される加圧含浸法によれば，充分な深さ
まで処理剤水溶液を含浸させ得るが，この方法を実施す
るには特別の装置を要し，簡易には行ない難い面があ
る。Problems to be Solved by the Invention According to the coating method as described in JP-A-60-108385, the aqueous solution of the treating agent does not easily penetrate from the surface of the cementitious material to the inside deeply. It is difficult to keep deterioration prevention for a long time. Although a treating agent to which a substance that promotes permeation is further added is also used as exemplified in the publication, the permeation depth cannot be remarkably improved by such a treating agent. On the other hand, JP-A-59-645
According to the pressure impregnation method disclosed in Japanese Patent Publication No. 82, a treatment agent aqueous solution can be impregnated to a sufficient depth, but this method requires a special device and is difficult to perform easily.
本発明の目的は，処理剤水溶液をセメント系材料表面か
らその内部深くまで含浸させるための簡易，かつ効率的
な施工方法を提供することにある。An object of the present invention is to provide a simple and efficient construction method for impregnating a treatment agent aqueous solution from the surface of a cement-based material to a deep inside thereof.
問題点を解決するための手段 本発明のセメント系材料の劣化防止施工方法は，充分な
保液性を有し，かつ，セメント系材料表面の吸液に応じ
て内部から表面に液の移行が起るシート又はマットを当
該セメント系材料の表面に当接せしめ，上記シート又は
マットに処理剤水溶液を含ませて充分時間放置すること
を特徴とする。MEANS FOR SOLVING PROBLEMS The method for preventing deterioration of a cement-based material according to the present invention has sufficient liquid-retaining property, and liquid transfer from the inside to the surface depending on liquid absorption on the surface of the cement-based material. The resulting sheet or mat is brought into contact with the surface of the cement-based material, and the sheet or mat is allowed to stand for a sufficient period of time after being impregnated with the aqueous treatment agent solution.
本発明の施工方法が適用されるセメント系材料は，通常
の水硬性セメントを必須成分とする硬化したセメント，
モルタル，コンクリート等である。これらセメント系材
料としては，劣化の進行前のもの，既に劣化の起ったも
のいずれも適用される。特に鉄筋コンクリート，鉄骨コ
ンクリート等腐食性金属材料が埋め込まれたコンクリー
ト，また，アルカリ骨材反応を起す骨材が配合されたコ
ンクリート等は好適例である。The cement-based material to which the construction method of the present invention is applied is a hardened cement containing an ordinary hydraulic cement as an essential component,
Mortar, concrete, etc. As these cement-based materials, both those that have not deteriorated yet and those that have already deteriorated are applied. Particularly, concrete examples in which a corrosive metal material such as reinforced concrete or steel frame concrete is embedded, or concrete in which an aggregate that causes an alkali aggregate reaction is mixed are preferable examples.
本発明の施工法に用いられる処理剤水溶液としては，亜
硝酸塩類，例えば，亜硝酸カルシウム，亜硝酸リチウム
等が溶解している水溶液，珪酸アルカリが溶解している
水溶液，或いはこれらの混合水溶液等が代表的に挙げら
れる。これら水溶液には，本発明の目的が達成される限
り，他の任意の成分を含有させて差支えない。The treating agent aqueous solution used in the construction method of the present invention is an aqueous solution in which nitrites such as calcium nitrite and lithium nitrite are dissolved, an aqueous solution in which alkali silicate is dissolved, or a mixed aqueous solution thereof. Is representatively mentioned. These aqueous solutions may contain other optional components as long as the object of the present invention is achieved.
本発明の施工法に用いられるシート又はマットとして
は，親水性基材，例えば，綿，レーヨン，ナイロン，ポ
リエステル，ポリウレタン等から造られた厚手の布，
紙，マット，合成樹脂発泡体等が挙げられる。これらシ
ート又はマットは，処理剤水溶液を０．５kg/m2以上，
好ましくは１〜１０kg/m2程度保持するに充分な厚さを
有すればよい。通常，柔軟性を有する２mm〜十数mm程度
の熱さのものでよいが，これらシート又はマットは，こ
れに保持された処理剤水溶液が，このマット又はシート
に当接するセメント系材料表面の吸液に応じて，内部か
ら表面に移行が起る多孔質の内部構造を有し，表面が粗
である必要がある。このようなシート又はマットの例と
しては，本発明とは別の分野に用いられるコンクリート
養生マット，脱脂綿，ティッシュペーパーの重ねたも
の，厚手の綿布，スポンジ，綿，紙等を内蔵したマット
等が挙げられる。As the sheet or mat used in the construction method of the present invention, a hydrophilic substrate, for example, a thick cloth made of cotton, rayon, nylon, polyester, polyurethane, or the like,
Examples include paper, mats, synthetic resin foams, and the like. These sheets or mats contain 0.5 kg / m 2 or more of treatment solution,
Preferably, it should have a thickness sufficient to hold about 1 to 10 kg / m 2 . Usually, the sheet having a softness of about 2 mm to about a dozen mm or so may be used. However, in these sheets or mats, the aqueous solution of the treatment agent held on the sheets or mat absorbs the surface of the cement-based material that contacts the mat or sheet. Accordingly, it is necessary to have a porous internal structure in which a transition occurs from the inside to the surface and the surface should be rough. Examples of such sheets or mats include concrete curing mats used in fields other than the present invention, absorbent cotton, a stack of tissue paper, thick cotton cloth, sponge, cotton, mats containing paper, etc. Can be mentioned.
本発明の施工方法は，上記セメント系材料の表面に，上
記シート又はマットを当接せしめ，このシート又はマッ
トに上記処理剤を含有させて充分時間放置する方法であ
る。シート又はマットに処理剤を含有させる方法として
は，通常の方法，例えば，シート又はマット上にローラ
ー刷毛，スプレー等により処理剤を塗布する方法が挙げ
られる。上記放置の充分時間としては，セメント系材料
の吸液速度に応じて所望深さまで処理剤が浸透するに要
する時間であればよい。通常の鉄筋コンクリート等で
は，ほぼ一昼夜程度でよい。また，上記放置の際，処理
剤水溶液の蒸発を避けるために，上記シート又はマット
上をプラスチック製フィルム等で覆ってもよい。更に，
上記処理施工後，その表面に上塗りを施してもよい。The construction method of the present invention is a method in which the above-mentioned sheet or mat is brought into contact with the surface of the above-mentioned cement-based material, the above-mentioned treatment agent is contained in this sheet or mat, and it is left for a sufficient time. Examples of the method of incorporating the treatment agent into the sheet or mat include a usual method, for example, a method of applying the treatment agent onto the sheet or mat with a roller brush, spray or the like. The sufficient time for the above-mentioned standing may be a time required for the treatment agent to penetrate to a desired depth depending on the liquid absorption speed of the cement-based material. For ordinary reinforced concrete, it will take about one day and night. Also, in order to avoid evaporation of the treatment agent aqueous solution during the above-mentioned standing, the above-mentioned sheet or mat may be covered with a plastic film or the like. Furthermore,
After the above-mentioned treatment and construction, a top coat may be applied to the surface.
作 用 上記シート又はマットをセメント系材料の表面に当接さ
せて，これに上記処理剤水溶液を含有せしめると，シー
ト又はマットはその保液性により，セメント系材料中へ
含浸するに充分な量の処理剤水溶液を保持する。而して
上記当接により，処理剤水溶液は，シート又はマットの
内部から表面に移行できるから，セメント系材料表面の
吸液速度に応じて逐次，連続的にシート又はマットの内
部からその表面を通してセメント系材料の内部へと移
行，浸透する。Operation When the above-mentioned sheet or mat is brought into contact with the surface of the cementitious material and the above treatment agent aqueous solution is added to the surface of the cementitious material, the amount of the sheet or mat is sufficient to be impregnated into the cementitious material due to its liquid retaining property. Hold the treating agent aqueous solution. By the above contact, the treatment agent aqueous solution can be transferred from the inside of the sheet or mat to the surface, so that the treatment agent aqueous solution can be sequentially and continuously passed from the inside of the sheet or mat depending on the liquid absorption speed of the surface of the cement-based material. It migrates and penetrates into the cement material.
従来法のスプレー又はローラー刷毛によりセメント系材
料表面に処理剤水溶液を塗布する方法では，一時的にセ
メント系材料表面を多量の液で覆うことはできても，セ
メント系材料の表面の吸液速度は小さいから，塗布され
た液の殆んどの部分はセメント系材料の内部へ浸透せず
に流酸する。この塗布を重ねても処理剤水溶液の浸透深
さがさ程深まらないのに対し，本発明の方法によると著
しく深い部位まの浸透を容易に達成させることができ
る。In the conventional method of applying the treatment agent aqueous solution to the surface of the cement-based material by spraying or roller brush, although the surface of the cement-based material can be temporarily covered with a large amount of liquid, the absorption rate of the surface of the cement-based material can be increased. Since most of the applied liquid does not penetrate into the cementitious material because it is small, it flows with sulfuric acid. Even if this coating is repeated, the penetration depth of the treatment agent aqueous solution does not become so deep, whereas the method of the present invention makes it possible to easily achieve the penetration to a remarkably deep portion.
実施例１ 単位セメント量２７０kg/m3，水セメント比０．６５，
細骨材率４８，粗骨材の最大粒径２０mm，食塩含有率
６．８kg/m3，スランプ値１８cmの未硬化コンクリート
と，直径１０mm，長さ４００mmのＳＧＤ−３みがき鋼棒
とを用意し，型枠を用いて寸法１００mm×１００mm×４
００mm鉄筋コンクリートを打設した。上記鋼棒は，端面
を除いて，かぶり厚２０mmにコンクリートで覆われてい
る。Example 1 Unit cement amount 270 kg / m 3 , water cement ratio 0.65
Fine aggregate ratio 48, coarse aggregate maximum particle size 20 mm, salt content 6.8 kg / m 3 , slump value 18 cm uncured concrete and diameter 10 mm, length 400 mm SGD-3 brushed steel rod are prepared. Then, using the formwork, the dimensions are 100 mm x 100 mm x 4
00mm reinforced concrete was placed. The steel rod is covered with concrete to a cover thickness of 20 mm except for the end surface.
上記鉄筋コンクリートを２８日間水中養生した後，鉄筋
が露出しているコンクリートの両端面をエポキシ樹脂で
被覆し，更に，相対湿度６０％，炭酸ガス５０％の室内
に３０℃で１ケ月間放置することにより，内部中央部ま
で中性化させた鉄筋コンクリート供試体を得た。After curing the above reinforced concrete in water for 28 days, coat both end surfaces of the concrete with exposed reinforcing bars with epoxy resin, and leave it in a room with relative humidity of 60% and carbon dioxide gas of 50% at 30 ° C for 1 month. As a result, a reinforced concrete specimen that was neutralized to the inner center was obtained.
次いで，上記中性化鉄筋コンクリート供試体の両端面を
除く全面を市販の脱脂綿で覆い，この脱脂綿のまわりを
ゴムひもで軽く縛ることにより脱脂綿を供試体表面に充
分に当接させた。次いで，上記供試体を覆う脱脂綿に，
ローラー刷毛を用いて３０重量％の亜硝酸カルシウム水
溶液を塗布し，吸液させた。この脱脂綿に保持された亜
硝酸カルシウム水溶液の量は８kg/m2であった。このま
ゝ２４時間室内に放置した後，脱脂綿を供試体からはが
し取り，重さを測定したところ，脱脂綿には３．３kg/m
2の亜硝酸カルシウム水溶液が残存していた。次いで，
上記脱脂綿をはがされたコンクリート供試体を割裂し，
その割裂面に亜硝酸根に反応するＧＲ指示薬（スルファ
ニル酸１重量部，酒石酸８．９重量部，α−ナフチルア
ミン０．１重量部の混合物の１％水溶液）を噴霧したと
ころ，コンクリートの表面から内部方向３０〜４０mmの
部位まで赤褐色に呈色した。この呈色によって，亜硝酸
カルシウム水溶液がコンクリートの表面から深さ３０〜
４０mmまで浸透したことがわかり，コンクリート供試体
中に埋設された鋼棒にも亜硝酸カルシウム水溶液が到達
していることがわかる。Next, the entire surface of the above-mentioned neutralized reinforced concrete specimen except for both end surfaces was covered with commercially available absorbent cotton, and the absorbent cotton was lightly bound around the absorbent cotton so that the absorbent cotton was sufficiently brought into contact with the surface of the specimen. Next, on the absorbent cotton that covers the specimen,
A roller brush was used to apply a 30 wt% calcium nitrite aqueous solution to absorb the liquid. The amount of calcium nitrite aqueous solution retained on this absorbent cotton was 8 kg / m 2 . After leaving it in the room for 24 hours, the absorbent cotton was peeled off from the test piece and weighed.
The calcium nitrite aqueous solution of 2 remained. Then,
Cleaving the above-mentioned absorbent cotton-peeled concrete specimen,
A GR indicator (1% by weight of a mixture of 1 part by weight of sulfanilic acid, 8.9 parts by weight of tartaric acid and 0.1 part by weight of α-naphthylamine) which reacts with nitrite was sprayed on the split surface, and from the surface of the concrete. A reddish brown color was developed up to a portion of 30 to 40 mm in the inner direction. Due to this coloration, the calcium nitrite aqueous solution has a depth of 30 ~ from the surface of the concrete.
It can be seen that it has penetrated up to 40 mm, and that the aqueous calcium nitrite solution has reached the steel rods embedded in the concrete specimen.
別途，上記と同様にして，中性化された鉄筋コンクリー
ト供試体に亜硝酸カルシウム水溶液を浸透させた後，相
対湿度９５％，温度５０℃の室内に１ケ月間放置するこ
とにより腐食促進試験を行った。供試体表面には異常が
認められなかった。上記供試体を室内から取り出し，割
裂し，埋設されていた鉄筋をとり出した。次いで，上記
取り出した鉄筋を，インヒビターが混入された塩酸で処
理することにより，鉄筋に生じた錆を除去した。重量測
定したところ，鉄筋の減量は６５mgであった。Separately, in the same manner as above, after the calcium nitrite aqueous solution was infiltrated into the neutralized reinforced concrete specimen, a corrosion acceleration test was conducted by leaving it in a room with a relative humidity of 95% and a temperature of 50 ° C for one month. It was No abnormalities were found on the surface of the specimen. The above specimen was taken out of the room, split, and the buried reinforcing bar was taken out. Then, the taken-out rebar was treated with hydrochloric acid containing an inhibitor to remove rust formed on the rebar. When the weight was measured, the weight loss of the reinforcing bar was 65 mg.
更に，上記供試体について，２８日間水中養生直後，炭
酸ガスによる中性化処理の直後，亜硝酸カルシウム水溶
液の浸透直後及び腐食促進処理直後に夫々，ASTM C876-
80の方法により鋼棒の自然電極電位を測定したところ，
−180ｍＶ，−540ｍＶ，−130ｍＶ及び−140ｍＶであ
り，電位が貴の方へ向うことを認めた。Furthermore, the above test specimens were respectively subjected to ASTM C876- immediately after curing in water for 28 days, immediately after carbon dioxide neutralization, immediately after infiltration of an aqueous solution of calcium nitrite, and immediately after corrosion promotion treatment.
When the natural electrode potential of the steel rod was measured by the method of 80,
It was -180 mV, -540 mV, -130 mV and -140 mV, and it was confirmed that the potential was toward you.
比較例１ 実施例１における亜硝酸カルシウム水溶液の浸透処理を
行わない他は，実施例１と同様にして鋼棒の腐食減量及
び自然電極電位を測定し，更に腐食促進処理直後のコン
クリート供試体表面の観察を行ったところ，第１表に記
載の結果を得た。Comparative Example 1 Corrosion weight loss and natural electrode potential of a steel rod were measured in the same manner as in Example 1 except that the calcium nitrite aqueous solution infiltration treatment in Example 1 was not performed, and the surface of the concrete specimen immediately after the corrosion acceleration treatment was measured. As a result of observation, the results shown in Table 1 were obtained.
比較例２ 実施例１における脱脂綿を介した亜硝酸カルシウム水溶
液の浸透処理の代りに，脱脂綿を用いないで，コンクリ
ート供試体表面に直接ローラー刷毛を用いて亜硝酸カル
シウム水溶液を２回塗布した。塗布量は４５０g/m2であ
った。他は実施例１と同様にして試験し，第１表記載の
結果を得た。Comparative Example 2 Instead of the permeation treatment of the calcium nitrite aqueous solution through the absorbent cotton in Example 1, the calcium nitrite aqueous solution was applied twice to the surface of the concrete specimen directly by using a roller brush without using the absorbent cotton. The coating amount was 450 g / m 2 . Others were tested in the same manner as in Example 1, and the results shown in Table 1 were obtained.
第１表に示す如く，従来法によれば鉄筋の腐食抑制が充
分でなく，コンクリートの劣化をもたらすのに対し，本
発明の方法によれば，鉄筋の腐食抑制及びコンクリート
の劣化防止が達成される。 As shown in Table 1, according to the conventional method, the corrosion of the reinforcing bars is not sufficiently suppressed and the concrete is deteriorated, whereas according to the method of the present invention, the corrosion of the reinforcing bars and the deterioration of the concrete are prevented. It
実施例２ 海岸近くの鉄筋コンクリート建造物が築後15年を経て塩
害を蒙っていた。そのコンクリートの表面に，厚さ１０
mmの綿布を当接するように張り，更にその上を飛散防止
のためにネットで覆った。次いで，この綿布に，ローラ
ー刷毛を用いて，亜硝酸カルシウム水溶液の３０％水溶
液を７kg/m2含浸させた。綿布の表面からの水の蒸発を
抑えるために，綿布及びネットの上をポリエチレン製シ
ートで覆い，２４時間放置後綿布をとりはずし，更に２
４時間放置した。次いで，上記処理を施したコンクリー
トの表面に，ＳＢＲラテックス混入のセメントペースト
を厚さ２mmにこて塗りし，更に２週間経過後，化粧用仕
上材を塗布した。この仕上剤の硬化後，コンクリート壁
にボーリングを行いコア抜きし，取り出したコアにＧＲ
試薬を噴霧することにより発色させ，亜硝酸カルシウム
水溶液の浸透深さを測定したところ，３０mmであった。
また，上記施工の前と後とに，コンクリート中の鉄筋の
一部を露出させ，その鉄筋の自然電極電位を測定したと
ころ，施工前では−575ｍＶであったが，施工後では−1
58ｍＶであった。Example 2 A reinforced concrete building near the coast was salt-damaged 15 years after its construction. The thickness of the concrete surface is 10
A mm-sized cotton cloth was stretched so that it abuts, and a net was placed over it to prevent scattering. Next, this cotton cloth was impregnated with a 30% aqueous solution of calcium nitrite solution at 7 kg / m 2 using a roller brush. To prevent water from evaporating from the surface of the cotton cloth, cover the cotton cloth and net with a polyethylene sheet, leave it for 24 hours, then remove the cotton cloth.
It was left for 4 hours. Then, a cement paste mixed with SBR latex was troweled to a thickness of 2 mm on the surface of the treated concrete, and after a lapse of 2 weeks, a cosmetic finishing material was applied. After hardening of this finishing agent, bore the concrete wall to remove the core, and remove the core from the core.
The color was developed by spraying the reagent, and the penetration depth of the calcium nitrite aqueous solution was measured and found to be 30 mm.
In addition, before and after the above construction, when a part of the reinforcing bar in the concrete was exposed and the natural electrode potential of the reinforcing bar was measured, it was −575 mV before the construction, but −1 after the construction.
It was 58 mV.
実施例３ アルカリ骨材反応により劣化したコンクリート構造物の
表面に，亜硝酸リチウムの２５重量％水溶液を用いて実
施例２と同様にして，亜硝酸リチウム水溶液の含浸処理
を施した。亜硝酸リチウム水溶液の綿布への含浸量は７
kg/m2であり，コンクリート中浸透深さは３５mmであっ
た。ＳＢＲラテックス混入セメントペーストを２mm厚に
塗布した。この施工を行ったコンクリート表面につい
て，ミクロンストレインゲージを用いて１２ケ月にわた
って長さの変化を測定した。その結果は第１図に示され
ている如く、コンクリートの膨脹が殆ど起っていないこ
とを示している。Example 3 The surface of a concrete structure deteriorated by an alkali-aggregate reaction was impregnated with a lithium nitrite aqueous solution in the same manner as in Example 2 using a 25 wt% aqueous solution of lithium nitrite. The amount of lithium nitrite aqueous solution impregnated into the cotton cloth is 7
It was kg / m 2 and the penetration depth in concrete was 35 mm. A cement paste mixed with SBR latex was applied to a thickness of 2 mm. The length of the concrete surface subjected to this construction was measured for 12 months using a micron strain gauge. The results show that, as shown in FIG. 1, the expansion of the concrete hardly occurs.
比較例３ 綿布を使用しないで，コンクリート表面に直接ローラー
刷毛で亜硝酸カルシウム水溶液を６００g/m2に塗布した
他は実施例２と同様に施工したところ亜硝酸カルシウム
水溶液の浸透深さは５mmであり，鉄筋の自然電極電位
は，施工前−550ｍＶが施工後−470ｍＶに変ったのみ
で，防錆効果は充分でなかった。Comparative Example 3 The same procedure as in Example 2 was carried out except that the calcium nitrite aqueous solution was applied to the concrete surface by a roller brush directly at 600 g / m 2 without using cotton cloth, and the penetration depth of the calcium nitrite aqueous solution was 5 mm. However, the natural electrode potential of the reinforcing bar changed from −550 mV before construction to −470 mV after construction, and the rust prevention effect was not sufficient.
比較例４及び５ 実施例３の施工に供せられたものと同じコンクリート構
造物について，無処理のまゝ表面の膨張度を測定し，比
較例４としてその結果を第１図に示す。Comparative Examples 4 and 5 With respect to the same concrete structure as that used in the construction of Example 3, the expansion degree of the untreated raw surface was measured, and the result is shown as Comparative Example 4 in FIG.
また，比較例５として，綿布を用いないでローラー刷毛
で直接コンクリート表面に亜硝酸リチウム水溶液を８０
０g/m2塗布した他は，実施例３と同様の施工を行ない，
その結果を第１図に示す。Further, as Comparative Example 5, 80% lithium nitrite aqueous solution was directly applied to the concrete surface with a roller brush without using cotton cloth.
The same construction as in Example 3 was performed except that 0 g / m 2 was applied,
The results are shown in FIG.
第１図は，従来法ではアルカリ骨材反応の進行を充分に
抑制できないのに対し，本発明の方法によると充分な抑
制を達成できることを示している。FIG. 1 shows that the conventional method cannot sufficiently suppress the progress of the alkaline aggregate reaction, whereas the method of the present invention can achieve sufficient suppression.
発明の効果 本発明によると，前記の如くシート又はマットをセメン
ト系材料の表面に当接せしめ，これに処理剤水溶液を保
持させたまゝ放置するのみで，セメント系材料の内部深
くまで液を含浸させることができ，極めて簡易に施工す
ることができ，しかも，処理剤水溶液の損失も少なく効
率的である。本発明の方法により，内部深くまで処理剤
が含浸したセメント系材料は，著しい劣化防止性によっ
て長期間劣化が起らない。EFFECTS OF THE INVENTION According to the present invention, the sheet or mat is brought into contact with the surface of the cement-based material as described above, and the solution of the treating agent is retained and left alone, and the liquid is impregnated deep inside the cement-based material. It is possible to perform it very easily, and it is efficient with less loss of the treatment agent aqueous solution. By the method of the present invention, the cement-based material, which is deeply impregnated with the treating agent, does not deteriorate for a long period of time due to the remarkable deterioration preventing property.
場合によっては，上記施工後，セメント系材料の表面に
更に上塗りを施すとよい。上塗り材としては，セメント
ペースト，モルタル，コンクリート，又はこれらに通常
用いられるポリマーエマルジョンを混入させた材料等が
挙げられる。特に，劣化したセメント系材料に対して
は，この上塗りによって好ましい補修を達成できる。更
に常法の如く，トップコートとして放水塗材を施すこと
もできる。In some cases, after the above construction, it is advisable to further coat the surface of the cementitious material. Examples of the overcoat material include cement paste, mortar, concrete, and materials in which a polymer emulsion usually used in these is mixed. Particularly for deteriorated cementitious materials, this overcoat can achieve a favorable repair. Further, as in the conventional method, a water spray coating material can be applied as a top coat.
第１図は，コンクリートの放置時間（横軸）に対する膨
脹率（縦軸）を示したものであり，図中符号Ａの線は，
実施例３の方法による結果を，符号Ｂの線は，比較例４
の方法による結果を，また，符号Ｃの線は，比較例５の
方法による結果を夫々示す。FIG. 1 shows the expansion rate (vertical axis) with respect to the standing time (horizontal axis) of concrete, and the line with the symbol A in the figure is
The results obtained by the method of Example 3 are shown by the line B in Comparative Example 4.
The result of the method of Comparative Example 5 and the line of reference symbol C show the result of the method of Comparative Example 5.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 坂口 由里子 千葉県船橋市坪井町722番地１ 日産化学 工業株式会社中央研究所内 審査官 小野 秀幸 (56)参考文献 特開 昭61−256951（ＪＰ，Ａ) 特開 昭60−108385（ＪＰ，Ａ) 特開 昭59−64582（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuriko Sakaguchi 722-1, Tsuboi-cho, Funabashi, Chiba Pref. Hideyuki Ono Examiner, Central Research Laboratory, Nissan Chemical Industries, Ltd. (56) ) JP-A-60-108385 (JP, A) JP-A-59-64582 (JP, A)
Claims (1)
料の吸液に応じて内部から表面に液の移行が起るシート
又はマツトを当該セメント系材料の表面に当接せしめ，
上記シート又はマットに処理剤水溶液を含ませて放置す
ることを特徴とするセメント系材料の劣化防止施工方
法。1. A sheet or mat having a sufficient liquid-retaining property and having a liquid transfer from the inside to the surface according to the liquid absorption of the cement-based material is brought into contact with the surface of the cement-based material.
A method for preventing deterioration of a cement-based material, which comprises allowing the above-mentioned sheet or mat to contain an aqueous solution of a treating agent and allowing the sheet or mat to stand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61002994A JPH0635352B2 (en) | 1986-01-10 | 1986-01-10 | Construction method for preventing deterioration of cement-based materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61002994A JPH0635352B2 (en) | 1986-01-10 | 1986-01-10 | Construction method for preventing deterioration of cement-based materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62265189A JPS62265189A (en) | 1987-11-18 |
| JPH0635352B2 true JPH0635352B2 (en) | 1994-05-11 |
Family
ID=11544929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61002994A Expired - Lifetime JPH0635352B2 (en) | 1986-01-10 | 1986-01-10 | Construction method for preventing deterioration of cement-based materials |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0635352B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009073695A (en) * | 2007-09-20 | 2009-04-09 | Nippon Concrete Ind Co Ltd | Water absorption preventing layer forming method |
| JP2010203163A (en) * | 2009-03-04 | 2010-09-16 | Nippo Corp | Concrete pavement method |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01103970A (en) * | 1987-10-15 | 1989-04-21 | Nissan Chem Ind Ltd | Method for preventing deterioration of hardened concrete |
| JP2003212674A (en) * | 2002-11-22 | 2003-07-30 | Denki Kagaku Kogyo Kk | Method of repairing concrete |
| JP5352074B2 (en) * | 2007-10-31 | 2013-11-27 | 株式会社竹中工務店 | Method for treating concrete molded body using alkaline treatment liquid |
| JP5514358B1 (en) | 2013-03-29 | 2014-06-04 | 有限会社Ａｅｓ | Concrete structure modifier and method for repairing concrete structure |
| JP6906949B2 (en) * | 2016-01-15 | 2021-07-21 | 国立研究開発法人国立環境研究所 | Method of suppressing alkali-silica reaction |
| JP6485892B1 (en) * | 2018-03-16 | 2019-03-20 | 株式会社Ｔｓｃ | Concrete surface protection method |
| JP7271388B2 (en) * | 2019-10-09 | 2023-05-11 | 川田建設株式会社 | Method for removing salt from concrete structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60108385A (en) * | 1983-11-11 | 1985-06-13 | 日産化学工業株式会社 | Degradation prevention for cementitious material |
-
1986
- 1986-01-10 JP JP61002994A patent/JPH0635352B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009073695A (en) * | 2007-09-20 | 2009-04-09 | Nippon Concrete Ind Co Ltd | Water absorption preventing layer forming method |
| JP2010203163A (en) * | 2009-03-04 | 2010-09-16 | Nippo Corp | Concrete pavement method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62265189A (en) | 1987-11-18 |
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