JP5730627B2 - Curing agent for alumina cement composition and repair method using the same - Google Patents
Curing agent for alumina cement composition and repair method using the same Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Description
本発明は、コンクリート構造物の補修、特に硫酸により劣化を受けた下水処理施設のコンクリート構造物の補修などに使用するアルミナセメント組成物用の養生剤およびそれを用いた補修工法に関する。 The present invention relates to a curing agent for an alumina cement composition used for repairing a concrete structure, particularly repairing a concrete structure of a sewage treatment facility that has been deteriorated by sulfuric acid, and a repair method using the same.
セメント系材料は、打設後から硬化するまでの間に水分が蒸発すると、表面にひび割れが生じ、また、硬化後の強度が低下する。
特に、下水道処理施設の補修に多く用いられるアルミナセメント系材料は、保水性が悪く、水分の蒸発が著しい。その結果、表面のひび割れに加え、表層部がドライアウトし、強度が著しく低下し十分な付着強度が得られないという課題があった。特に気温が高い時や、湿度の低い時等においては、水分の蒸発が早いためそれらの問題が生じやすい。
このため、従来から、セメント系材料打設後から硬化するまでの間に、一般に、散水養生、シート養生、バルーン養生、被膜養生等の養生が行われており、これらの養生方法により、打設後の材料表面からの水分蒸発を防止することが行われている。
しかしながら、散水養生は、セメント系材料がある程度硬化した後にしか行うことができないため、散水養生開始までの間の水分蒸発を抑制することはできない。また、湿度の低い時には蒸発速度が速く、何度も散水作業を行わなければならない。
In the cementitious material, when moisture evaporates between the time of placement and the time of hardening, the surface is cracked and the strength after hardening is reduced.
In particular, alumina cement-based materials that are often used for repairing sewerage treatment facilities have poor water retention and significant evaporation of moisture. As a result, in addition to surface cracks, there was a problem that the surface layer portion was dried out, the strength was significantly lowered, and sufficient adhesion strength could not be obtained. In particular, when the temperature is high or the humidity is low, such problems are likely to occur due to the rapid evaporation of moisture.
For this reason, conventionally, curing such as watering curing, sheet curing, balloon curing, and film curing is generally performed between the time after the cement-based material is placed and until it is hardened. It has been practiced to prevent moisture evaporation from the material surface afterwards.
However, since the watering curing can be performed only after the cementitious material has hardened to some extent, it is not possible to suppress water evaporation until the watering curing starts. Also, when the humidity is low, the evaporation rate is fast and watering work must be performed many times.
シート養生については、長期に養生する際には、シートを現場にそのまま放置することが必要であり、また、施工面積が増大するにつれて使用するシートも増加し、作業が面倒で手間がかかり、硬化後はシートの撤去が必要であるため、廃棄物の量も増える。
また、被膜養生剤としては、二液硬化型のエポキシ系のものやパラフィン系のもの、水性のエマルジョン系のものが種々知られているが、これらは、セメント系材料が硬化した後に塗布するものであり、硬化後の水分の蒸発を抑止しひび割れを防止することはできても、セメント系材料が硬化する前のドライアウトやひび割れを防止することは困難であった。
With regard to sheet curing, when curing for a long period of time, it is necessary to leave the sheet on site as it is, and the number of sheets to be used increases as the construction area increases, making the work cumbersome and time-consuming and hardening. After that, it is necessary to remove the sheet, so the amount of waste also increases.
Various coating curing agents are known, such as two-component curing type epoxy type, paraffin type, and aqueous emulsion type, which are applied after the cementitious material is cured. Thus, even though the evaporation of moisture after curing can be suppressed and cracking can be prevented, it has been difficult to prevent dryout and cracking before the cementitious material is cured.
セメント系材料が水和硬化した後に、セメント系材料の表面層を化学的に改質することで強化する方法として、珪酸ソーダや珪酸リチウムのような珪酸アルカリ金属水溶液のものが多く使用されており、珪酸アルカリ水溶液にポリマーエマルションを添加した処理液を、すでに硬化したセメント系材料の表面から含浸させ、これを乾燥させることで表面層を改質して強化する方法が提案されている（特許文献１）。
しかしながら、これらの方法もセメント系材料が硬化した後に使用するものであり、硬化後に使用セメント系材料が硬化する前のドライアウトやひび割れを防止することは困難であった。
また、ポリマーエマルションにリチウム塩を混入した処理液を、硬化前のフレッシュな状態のセメント系材料に塗布する被覆養生剤として用いる工法が提案されている（特許文献２）。
As a method for strengthening the cement-based material by chemically modifying the surface layer of the cement-based material after the cement-based material has been hydrated and hardened, an alkali metal silicate aqueous solution such as sodium silicate or lithium silicate is often used. A method has been proposed in which a treatment liquid obtained by adding a polymer emulsion to an alkali silicate aqueous solution is impregnated from the surface of an already hardened cementitious material and dried to modify and strengthen the surface layer (Patent Literature). 1).
However, these methods are also used after the cementitious material has been cured, and it has been difficult to prevent dry-out and cracking before the used cementitious material is cured after curing.
In addition, a method of using a treatment liquid in which a lithium salt is mixed in a polymer emulsion as a coating curing agent for applying to a fresh cementitious material before curing has been proposed (Patent Document 2).
本発明者らは、前記課題を解決するため、種々検討を重ねた結果、特定のアルミナセメント組成物に対して特定の組成の養生剤を用いることで著しい養生効果があることを見出し、本発明を完成するに至った。 As a result of various studies to solve the above problems, the present inventors have found that there is a remarkable curing effect by using a curing agent having a specific composition for a specific alumina cement composition. It came to complete.
劣化したコンクリート構造物の補修などに用いるアルミナセメント組成物が、硬化するまでの水分の逸脱を防止し、それにより、ドライアウトや初期ひび割れを防止する養生剤及びそれを用いた補修工法を提供する。 Alumina cement composition used for repairing deteriorated concrete structures, etc. provides a curing agent that prevents the deviation of moisture until it hardens, thereby preventing dryout and initial cracks, and a repair method using the same. .
本発明は、（１）アルミナセメント、ポゾラン物質、及び骨材を含有するアルミナセメント組成物に水を加えモルタルを調製し、硬化する前にモルタルの表面に塗布又は散布することを特徴とするアルミナセメント組成物用の養生剤であって、珪酸リチウムを含有する養生剤、（２）養生剤１００質量部中、Ｌｉ２Ｏとして０．１〜１０質量部、ＳｉＯ２として１〜３０質量部含有し、ＳｉＯ２／Ｌｉ２Ｏモル比が２〜８である（１）記載のアルミナセメント組成物用の養生剤、（３）（１）または（２）のアルミナセメント組成物用の養生剤を、アルミナセメント組成物に水を加えモルタルを調製し、硬化する前にモルタルの表面に塗布又は散布することを特徴とする、アルミナセメント組成物用の養生剤の施工方法、（４）（１）又は（２）のアルミナセメント組成物用養生剤を、アルミナセメント組成物に水を加えモルタルを調製し、硬化する前にモルタルの表面に塗布又は散布したアルミナセメント構造物、である。 The present invention is alumina, characterized in that the coating or sprayed on the surface of the mortar before water was added to prepare a mortar, cures (1) alumina cement, pozzolan material, and alumina cement composition containing the aggregate a curing agent for a cement composition, you containing lithium silicate nutrient Namazai, (2) 1-30 mass during curing agents 100 parts by weight of 0.1 to 10 parts by weight Li 2 O, as SiO 2 The curing agent for an alumina cement composition according to (1), wherein the curing ratio for the alumina cement composition is (3) (1) or (2), and the SiO 2 / Li 2 O molar ratio is 2 to 8 A method for applying a curing agent for an alumina cement composition, characterized in that water is added to the alumina cement composition to prepare a mortar, and the mortar is applied or sprayed on the surface of the mortar before curing (4) ( 1) Also Is an alumina cement structure obtained by applying the curing agent for alumina cement composition of (2), adding water to the alumina cement composition to prepare a mortar, and applying or spraying it on the surface of the mortar before curing.
本発明のアルミナセメント組成物用の養生剤は、流動性、作業性に優れる。さらに、初期ひび割れ抵抗性、ドライアウト抵抗性などに優れるため水分蒸発による表面層の強度低下を防止し、強度発現性が早く耐久性の高い構造物を得ることができる。
さらに、本発明の養生剤は取り扱いが容易であり、簡便に施工でき、硬化前のフレッシュな状態のアルミナセメント組成物のモルタルに塗布することで、本発明の養生剤の効果を一層有効に発現させることができる。
The curing agent for the alumina cement composition of the present invention is excellent in fluidity and workability. Furthermore, since it is excellent in initial crack resistance, dry-out resistance, etc., it is possible to prevent a decrease in strength of the surface layer due to moisture evaporation, and to obtain a structure with high strength and high durability.
Furthermore, the curing agent of the present invention is easy to handle, can be applied easily, and is applied more effectively to the mortar of the alumina cement composition in a fresh state before curing, thereby further effectively expressing the effect of the curing agent of the present invention. Can be made.
以下、本発明を詳細に説明する。
なお、本発明における部や％は、特に規定しない限り質量基準で示す。
Hereinafter, the present invention will be described in detail.
In the present invention, “parts” and “%” are based on mass unless otherwise specified.
本発明で使用するアルミナセメント組成物とは、アルミナセメント、ポゾラン物質、及び骨材を含有するものである。
本発明で使用するポゾラン物質は、高炉水砕スラグ、フライアッシュ、メタカオリンおよびシリカフュームの中から選ばれた少なくとも１種以上であることが好ましい。
ポゾラン物質はアルミナセメントと併用することで、水和物の相転移による強度低下を抑制する目的や、施工時のモルタルのダレ抵抗性を向上させる目的で使用するものである。ポゾラン物質の粉末度は、水和活性の点でブレーン比表面積３０００ｃｍ２／ｇ以上が好ましい。
ポゾラン物質の使用量は、通常、アルミナセメント１００部に対して、５０〜２００部が好ましく、１００〜１５０部がより好ましい。なお、シリカフュームは、アルミナセメント１００部に対して１〜１０部が好ましい。
The alumina cement composition used in the present invention contains an alumina cement, a pozzolanic material, and an aggregate.
The pozzolanic material used in the present invention is preferably at least one selected from blast furnace granulated slag, fly ash, metakaolin and silica fume.
The pozzolanic material is used in combination with alumina cement for the purpose of suppressing the strength reduction due to the phase transition of the hydrate and for improving the sag resistance of the mortar during construction. The fineness of the pozzolanic material is preferably a brane specific surface area of 3000 cm 2 / g or more in terms of hydration activity.
The amount of pozzolanic material used is usually preferably 50 to 200 parts, more preferably 100 to 150 parts, per 100 parts of alumina cement. Silica fume is preferably 1 to 10 parts with respect to 100 parts of alumina cement.
本発明で使用するアルミナセメント組成物には、急硬材、減水剤、ＡＥ減水剤、高性能減水剤、高性能ＡＥ減水剤、消泡剤、増粘剤、防錆剤、防凍剤、収縮低減剤、凝結調整剤、ベントナイトやヘクトライトなどの粘土鉱物、ハイドロタルサイトなどのアニオン交換体、水ガラスなどのアルカリ金属珪酸塩、ビニロンやナイロンなどの有機繊維等の混和材料からなる群のうちの一種又は二種以上を、本発明の目的を実質的に阻害しない範囲で併用することが可能である。 The alumina cement composition used in the present invention includes a hardener, a water reducing agent, an AE water reducing agent, a high performance water reducing agent, a high performance AE water reducing agent, an antifoaming agent, a thickening agent, a rust preventive agent, a defrosting agent, and a shrinkage. Among the group consisting of admixtures such as reducing agents, setting modifiers, clay minerals such as bentonite and hectorite, anion exchangers such as hydrotalcite, alkali metal silicates such as water glass, and organic fibers such as vinylon and nylon It is possible to use together 1 type, or 2 or more types of these in the range which does not inhibit substantially the objective of this invention.
市販のアルミナセメント組成物として、電気化学工業社製「デンカサンタイトＴＹＰＥ−Ｋ」、エレホン化成社製「アシドバリアＡＤ−２」、宇部興産製「Ｕ−アシテクトＮ」などが挙げられる。 Examples of commercially available alumina cement compositions include “Denkasan Tight TYPE-K” manufactured by Denki Kagaku Kogyo Co., Ltd., “Acid Barrier AD-2” manufactured by Elephone Kasei Co., Ltd., “U-Acitect N” manufactured by Ube Industries.
本発明で使用する養生剤は珪酸リチウムを含み、養生剤１００部中、Ｌｉ２Ｏとして０．１〜１０部含有し、ＳｉＯ２として、１〜３０部含有し、ＳｉＯ２／Ｌｉ２Ｏモル比が２〜８であることを特徴とする。
Ｌｉ２Ｏ含有量は、養生剤１００部中、０．１〜１０部が好ましく、０．５〜５部がより好ましい。Ｌｉ２Ｏ含有量が０．１部未満だと十分な硬化促進効果が得られず、５部を超えてもそれ以上の促進効果は期待できない。ＳｉＯ２含有量は、養生剤１００部中、１〜３０部が好ましく５〜２５部がより好ましい。ＳｉＯ２含有量が１部未満だと十分な硬化促進効果が得られず、３０部を超えると、粘度が高くなり、作業性を損なう場合がある。ＳｉＯ２／Ｌｉ２Ｏモル比は２〜８が好ましく、３〜５がより好ましい。２未満だと硬化促進効果が強すぎ、長期強度の増進が期待できない。８を超えると十分な硬化促進効果が得られない。
Curing agent used in the present invention include lithium silicate, in 100 parts of curing agent, containing 0.1 to 10 parts as Li 2 O, as SiO 2, containing from 1 to 30 parts, SiO 2 / Li 2 O molar The ratio is 2 to 8.
The Li 2 O content is preferably 0.1 to 10 parts and more preferably 0.5 to 5 parts in 100 parts of the curing agent. If the Li 2 O content is less than 0.1 part, a sufficient curing accelerating effect cannot be obtained, and even if it exceeds 5 parts, no further accelerating effect can be expected. The SiO 2 content is preferably 1 to 30 parts and more preferably 5 to 25 parts in 100 parts of the curing agent. If the SiO 2 content is less than 1 part, a sufficient curing accelerating effect cannot be obtained, and if it exceeds 30 parts, the viscosity increases and workability may be impaired. SiO 2 / Li 2 O molar ratio is preferably from 2 to 8, 3 to 5 are more preferred. If it is less than 2, the curing acceleration effect is too strong, and long-term strength cannot be expected to increase. If it exceeds 8, sufficient curing accelerating effect cannot be obtained.
本発明の養生剤には、亜硝酸リチウム、水酸化リチウム、塩化リチウム、臭化リチウムなどのうちの１種または２種以上の硬化促進剤、また、乾燥収縮低減剤や消泡剤等の添加剤を、本発明の目的を実質的に阻害しない範囲で使用することが可能である。 The curing agent of the present invention includes one or more curing accelerators such as lithium nitrite, lithium hydroxide, lithium chloride, and lithium bromide, and addition of a drying shrinkage reducing agent and an antifoaming agent. The agent can be used within a range that does not substantially inhibit the object of the present invention.
本発明の養生剤の施工方法は、養生剤を硬化前のフレッシュな状態のアルミナセメント組成物表面に塗布又は散布することを特徴とする。
モルタルが完全に硬化する前とは、気温、湿度などにより異なるが、通常、ＪＩＳ Ａ １１４７ コンクリートの凝結時間試験方法によって始発と判定されるまでの間である。
塗付方法は、刷毛塗り、ローラー塗り、または噴霧機による散布いずれの方法によっても施工可能である。
The curing agent construction method of the present invention is characterized in that the curing agent is applied to or spread on the surface of the alumina cement composition in a fresh state before curing.
The time before the mortar is completely cured varies depending on the temperature, humidity, and the like, but is usually until it is determined to be the first by the setting time test method of JIS A 1147 concrete.
The coating method can be applied by any method of brush coating, roller coating, or spraying with a sprayer.
本発明の養生剤の使用量は、特に限定されるものではないが、１ｍ２当たり、３０〜３００ｇの範囲で使用することが好ましく、５０〜１５０ｇがより好ましい。３０ｇ未満では均一に塗布することは難しく十分な養生効果を得られない場合があり、３００ｇを超えてもさらなる効果の向上が期待できない。 Although the usage-amount of the curing agent of this invention is not specifically limited, It is preferable to use in 30-300g per 1 m < 2 >, and 50-150g is more preferable. If it is less than 30 g, it is difficult to apply uniformly, and a sufficient curing effect may not be obtained, and even if it exceeds 300 g, further improvement in the effect cannot be expected.
本発明で云うアルミナセメント構造物とは、本発明のアルミナセメント組成物の養生剤、及びそれを使用した補修工法により、補修を行ったコンクリート構造物であり、劣化したコンクリート構造物の耐久性が著しく向上するものである。 The alumina cement structure referred to in the present invention is a concrete structure repaired by the curing agent of the alumina cement composition of the present invention and a repair method using the same, and the durability of the deteriorated concrete structure is This is a significant improvement.
以下、実施例、比較例を挙げてさらに詳細に内容を説明するが、本発明はこれらに限定されるものではない。 Hereinafter, although an example and a comparative example are given and the contents are explained in detail, the present invention is not limited to these.
「実験例１」
アルミナセメント１００部に対して、表１に示す種類と量のポゾラン物質、さらに、アルミナセメントとポゾラン物質の合計１００部に対して、骨材１７０部を加えドライモルタルとし、アルミナセメント組成物を調製した。
このアルミナセメント組成物１００部に対して水を１４部加え、モルタルを調製し、硬化前のモルタル表面に本発明の養生剤Ａを１ｍ２当たり１００ｇの割合で刷毛を用いて塗布した。さらに、この硬化体を用いてモルタルの耐硫酸性、保水率、初期ひび割れ抵抗性、および表層引張強度を測定した。
"Experiment 1"
Prepare the alumina cement composition by adding 170 parts of aggregate and dry mortar to 100 parts of alumina cement with the types and amounts of the pozzolanic materials shown in Table 1 and a total of 100 parts of alumina cement and pozzolanic material. did.
14 parts of water was added to 100 parts of this alumina cement composition to prepare a mortar, and the curing agent A of the present invention was applied to the surface of the mortar before curing using a brush at a rate of 100 g per 1 m 2 . Furthermore, using this cured product, sulfuric acid resistance, water retention, initial crack resistance, and surface layer tensile strength of the mortar were measured.
（使用材料）
アルミナセメント：アルミナセメント１号、市販品
ポゾラン物質Ａ：高炉水砕スラグ微粉末、ブレーン比表面積７０００ｃｍ２／ｇ、市販品
ポゾラン物質Ｂ：フライアッシュ、ブレーン比表面積４０００ｃｍ２／ｇ、市販品
ポゾラン物質Ｃ：メタカオリン、ＢＥＴ比表面積１０ｍ２／ｇ、市販品
ポゾラン物質Ｄ：シリカフューム、ＢＥＴ比表面積２０ｍ２／ｇ、市販品
ポゾラン物質Ｅ：ポゾラン物質Ａ５０部と、ポゾラン物質Ｂ５０部の混合物、ブレーン比表面積６０００ｃｍ２／ｇ、市販品
骨材：珪砂、商品名：Ｎ５０号珪砂（最大粒径：１．２ｍｍ 日瓢礦業社製）
水：水道水
養生剤Ａ：珪酸リチウム水溶液、商品名：リチウムシリケート１：４（ＳｉＯ２／Ｌｉ２Ｏモル比：４．０ 固形分濃度：２２．６％ 本荘ケミカル社製）
(Materials used)
Alumina cement: Alumina cement No. 1, commercially available pozzolanic material A: fine granulated blast furnace slag powder, brane specific surface area 7000 cm 2 / g, commercially available pozzolanic material B: fly ash, brain specific surface area 4000 cm 2 / g, commercially available pozzolanic material C: metakaolin, BET specific surface area of 10 m 2 / g, commercially available pozzolanic substance D: silica fume, BET specific surface area of 20 m 2 / g, commercially available pozzolanic substance E: mixture of 50 parts of pozzolanic substance and 50 parts of pozzolanic substance, Blaine specific surface area 6000 cm 2 / g, commercially available aggregate: silica sand, product name: No. N50 silica sand (maximum particle size: 1.2 mm, manufactured by Nippon Steel Corporation)
Water: Tap water curing agent A: Lithium silicate aqueous solution, Trade name: Lithium silicate 1: 4 (SiO 2 / Li 2 O molar ratio: 4.0, solid content concentration: 22.6%, manufactured by Honjo Chemical Co., Ltd.)
(試験方法)
耐硫酸性試験： ２０℃/ＲＨ５０％の恒温恒湿室において、練り混ぜたモルタルを１０ｃｍ×１０ｃｍ×１０ｃｍの型枠に打設し、２４時間後に硬化体を脱型、材齢２８日まで２０℃/ＲＨ５０％の恒温恒湿室において乾燥養生後、打設面のみを残し、耐酸性エポキシ樹脂で被覆した。温度２０℃で５％硫酸水溶液中に２８日間浸漬したときの打設面からの硫酸イオンの浸透深さを測定した。浸透深さの判定はフェノールフタレイン法で行った。
保水率：練り混ぜたモルタルをφ５×２．５ｃｍに成形し、速やかにその質量を測定し、温度２０℃、湿度６０％の室内に２４時間放置した後、再び質量を測定した。
保水率（％）＝（２４時間後の質量／成型直後の質量）×１００
初期ひび割れ抵抗性：練り混ぜたモルタルを縦３０ｃｍ×横３０ｃｍ×厚さ６ｃｍのコンクリート製平板に厚さ１０ｍｍとなるようにコテで塗り付け、温度５℃、湿度４０％、平均風速２ｍ／ｓの空間に放置し、１日後に発生した幅０．２ｍｍ以上のひび割れ全長さを測定した。
表層引張強度：練り混ぜたモルタルを縦３０ｃｍ×横３０ｃｍ×厚さ６ｃｍのコンクリート製平板に厚さ１０ｍｍとなるようにコテで塗り付け、温度５℃、湿度４０％、平均風速２ｍ／ｓの空間に放置し、φ５５ｍｍのコアドリルで硬化したモルタルを下地コンクリートまで削孔し、エポキシ樹脂で引張試験用のアタッチメントを取り付け、所定の材齢となった時点で建研式引張試験機により測定した。得られた値を表層引張強度とした。
(Test method)
Sulfuric acid resistance test: In a constant temperature and humidity chamber of 20 ° C./RH 50%, the kneaded mortar was placed in a 10 cm × 10 cm × 10 cm mold, and after 24 hours, the cured product was demolded. After drying and curing in a constant temperature / humidity chamber at 50 ° C./RH, only the casting surface was left and covered with an acid resistant epoxy resin. The penetration depth of sulfate ions from the casting surface when immersed in a 5% sulfuric acid aqueous solution at a temperature of 20 ° C. for 28 days was measured. The penetration depth was determined by the phenolphthalein method.
Water retention rate: The kneaded mortar was molded into φ5 × 2.5 cm, its mass was measured immediately, left in a room with a temperature of 20 ° C. and a humidity of 60% for 24 hours, and then the mass was measured again.
Water retention rate (%) = (mass after 24 hours / mass immediately after molding) × 100
Initial crack resistance: Kneaded mortar is applied to a concrete flat plate 30cm long x 30cm wide x 6cm thick to a thickness of 10mm, temperature 5 ° C, humidity 40%, average wind speed 2m / s The entire length of cracks having a width of 0.2 mm or more generated after one day was measured after being left in the space.
Surface tensile strength: Kneaded mortar on a concrete flat plate with a length of 30cm x width 30cm x thickness 6cm to a thickness of 10mm, temperature 5 ° C, humidity 40%, average wind speed 2m / s space The mortar cured with a core drill of φ55 mm was drilled up to the ground concrete, an attachment for a tensile test was attached with an epoxy resin, and when a predetermined age was reached, measurement was performed with a Kenken-type tensile tester. The obtained value was defined as the surface layer tensile strength.
表１より、本発明の養生剤は、特定のアルミナセメント組成物に対して、優れた養生効果を有し、耐硫酸性、保水率、表層引張強度および初期ひび割れ抵抗性が優れていることが判る。 From Table 1, the curing agent of the present invention has an excellent curing effect with respect to a specific alumina cement composition, and is excellent in sulfuric acid resistance, water retention, surface layer tensile strength, and initial crack resistance. I understand.
「実験例２」
アルミナセメント１００部に対して、ポゾラン物質Ａ１００部、さらに、アルミナセメントとポゾラン物質の合計１００部に対して、骨材１７０部を加えドライモルタルとし、アルミナセメント組成物を調製した。このアルミナセメント組成物１００部に対して水を１４部加え、モルタルを調製し、供試体を作製した。モルタル表面に表２に示す養生剤を１ｍ２当たり１００ｇの割合で刷毛を用いて塗布したこと以外は実験例１と同様に行った。
"Experimental example 2"
An alumina cement composition was prepared by adding 100 parts of pozzolanic material A to 100 parts of alumina cement, and then adding 170 parts of aggregate to dry mortar to 100 parts of alumina cement and pozzolanic material in total. 14 parts of water was added to 100 parts of this alumina cement composition to prepare a mortar, and a specimen was prepared. The same procedure as in Experimental Example 1 was conducted except that the curing agent shown in Table 2 was applied to the mortar surface at a rate of 100 g per m 2 using a brush.
(使用材料)
養生剤Ｂ：珪酸リチウム水溶液、商品名：リチウムシリケート２５（ＳｉＯ２／Ｌｉ２Ｏモル比：２．５ 固形分濃度：２２．６％ 日産化学社製）
養生剤Ｃ：珪酸リチウム水溶液、商品名：リチウムシリケート７５（ＳｉＯ２／Ｌｉ２Ｏモル比：７．５ 固形分濃度：２２．６％ 日産化学社製）
(Materials used)
Curing agent B: lithium silicate aqueous solution, trade name: lithium silicate 25 (SiO 2 / Li 2 O molar ratio: 2.5 solid content concentration: 22.6%, manufactured by Nissan Chemical Co., Ltd.)
Curing agent C: lithium silicate aqueous solution, trade name: lithium silicate 75 (SiO 2 / Li 2 O molar ratio: 7.5 solid content concentration: 22.6%, manufactured by Nissan Chemical Co., Ltd.)
表２より、本発明の塗布養生剤は、優れた養生効果を有し、耐硫酸性、保水率、表層引張強度および初期ひび割れ抵抗性が優れていることが判る。 From Table 2, it can be seen that the coating curing agent of the present invention has an excellent curing effect and is excellent in sulfuric acid resistance, water retention, surface layer tensile strength and initial crack resistance.
「実験例３」
アルミナセメント１００部に対して、ポゾラン物質Ａ１００部、さらに、アルミナセメントとポゾラン物質の合計１００部に対して、骨材１７０部を加えドライモルタルとし、アルミナセメント組成物を調製した。このアルミナセメント組成物１００部に対して水を１４部加え、モルタルを調製し、供試体を作製した。モルタル表面に表２に示す養生剤を１ｍ２当たり１００ｇの割合で刷毛を用いて塗布したこと以外は実験例１と同様に行った。
"Experiment 3"
An alumina cement composition was prepared by adding 100 parts of pozzolanic material A to 100 parts of alumina cement, and then adding 170 parts of aggregate to dry mortar to 100 parts of alumina cement and pozzolanic material in total. 14 parts of water was added to 100 parts of this alumina cement composition to prepare a mortar, and a specimen was prepared. The same procedure as in Experimental Example 1 was conducted except that the curing agent shown in Table 2 was applied to the mortar surface at a rate of 100 g per m 2 using a brush.
（使用材料）
養生剤Ｄ：養生剤Ａ１００部と水２００部の混合物（Ｌｉ２Ｏ含有量：０．８％、ＳｉＯ２含有量：６．７％）
養生剤Ｅ：養生剤Ａ１００部と水４００部の混合物（Ｌｉ２Ｏ含有量：０．５％、ＳｉＯ２含有量：４．０％）
養生剤Ｆ：養生剤Ａ１００部と水９００部の混合物（Ｌｉ２Ｏ含有量：０．２％、ＳｉＯ２含有量：２．０％）
養生剤Ｇ：養生剤Ａ１００部と水１９００部の混合物（Ｌｉ２Ｏ含有量：０．１％、ＳｉＯ２含有量：１．０％）
(Materials used)
Curing agent D: Mixture of curing agent A 100 parts and water 200 parts (Li 2 O content: 0.8%, SiO 2 content: 6.7%)
Curing agent E: Mixture of curing agent A 100 parts and 400 parts of water (Li 2 O content: 0.5%, SiO 2 content: 4.0%)
Curing Agent F: Mixture of Curing Agent A 100 parts and 900 parts of water (Li 2 O content: 0.2%, SiO 2 content: 2.0%)
Curing agent G: Mixture of curing agent A 100 parts and water 1900 parts (Li 2 O content: 0.1%, SiO 2 content: 1.0%)
表３より、本発明の養生剤は、優れた養生効果を有し、耐硫酸性、保水率、表層引張強度および初期ひび割れ抵抗性が優れていることが判る。 From Table 3, it can be seen that the curing agent of the present invention has an excellent curing effect and is excellent in sulfuric acid resistance, water retention, surface layer tensile strength and initial crack resistance.
「実験例４」
アルミナセメント１００部に対して、ポゾラン物質Ａ１００部、さらに、アルミナセメントとポゾラン物質の合計１００部に対して、骨材１７０部を加えドライモルタルとし、アルミナセメント組成物を調製した。このアルミナセメント組成物１００部に対して水を１４部加え、モルタルを調製し、供試体を作製した。モルタル表面に養生剤Ａを１ｍ２当たり表４に示す割合で刷毛を用いて塗布したこと以外は実験例１と同様に行った。
"Experimental example 4"
An alumina cement composition was prepared by adding 100 parts of pozzolanic material A to 100 parts of alumina cement, and then adding 170 parts of aggregate to dry mortar to 100 parts of alumina cement and pozzolanic material in total. 14 parts of water was added to 100 parts of this alumina cement composition to prepare a mortar, and a specimen was prepared. It was carried out in the same manner as in Experimental Example 1 except that the curing agent A was applied to the mortar surface at a rate shown in Table 4 per 1 m 2 using a brush.
表４より、本発明の塗布養生剤は、優れた養生効果を有し、耐硫酸性、保水率、表層引張強度および初期ひび割れ抵抗性が優れていることが判る。 From Table 4, it can be seen that the coating curing agent of the present invention has an excellent curing effect, and is excellent in sulfuric acid resistance, water retention, surface layer tensile strength, and initial crack resistance.
「実験例５」
アルミナセメント１００部に対して、ポゾラン物質Ａ１００部、さらに、アルミナセメントとポゾラン物質の合計１００部に対して、骨材１７０部を加えドライモルタルとしアルミナセメント組成物を調製した。このアルミナセメント組成物１００部に対して水を１４部加え、モルタルを調製し、供試体を作製した。表５に示した供試体作製後に経過した時間においてモルタル表面に養生剤Ａを１ｍ２当たり１００ｇの割合で刷毛を用いて塗布したこと以外は実験例１と同様に行った。なお、ＪＩＳＡ １１４７によって判定された始発時間は１０時間２０分であった。
“Experimental Example 5”
An alumina cement composition was prepared as dry mortar by adding 170 parts of aggregate to 100 parts of alumina cement and 100 parts of pozzolanic material A, and further 100 parts of alumina cement and pozzolanic material. 14 parts of water was added to 100 parts of this alumina cement composition to prepare a mortar, and a specimen was prepared. Except that the curing agent A was applied to the surface of the mortar at a rate of 100 g per 1 m 2 at a rate of 100 g per 1 m 2 during the time elapsed after preparation of the specimens shown in Table 5, it was performed in the same manner as in Experimental Example 1. The initial time determined by JISA 1147 was 10 hours and 20 minutes.
表５より、本発明の養生剤は、完全に硬化する前のフレッシュな状態のアルミナセメント組成物に塗布することで優れた養生効果を有し、耐硫酸性、保水率、表層引張強度および初期ひび割れ抵抗性が優れていることが判る。 From Table 5, the curing agent of the present invention has an excellent curing effect when applied to an alumina cement composition in a fresh state before being completely cured, and has sulfuric acid resistance, water retention, surface tensile strength and initial value. It can be seen that the crack resistance is excellent.
本発明のアルミナセメント組成物用の養生剤及びそれを用いた補修工法は、アルミナセメント組成物のモルタルの初期および長期の養生効果が優れるため、散水養生やシート養生などの煩わしい作業を必要としなくなる。さらに、保水性、初期ひび割れ抵抗性、表層引張強度、耐硫酸性などに優れるため長期耐久性が良好なコンクリート構造物の補修を容易に行うことが可能となるので、下水処理施設などの土木分野に幅広く適用できる。 The curing agent for an alumina cement composition of the present invention and the repair method using the curing agent are excellent in the initial and long-term curing effects of the mortar of the alumina cement composition, and thus do not require troublesome work such as watering curing and sheet curing. . Furthermore, because it has excellent water retention, initial crack resistance, surface tensile strength, and sulfuric acid resistance, it is possible to easily repair concrete structures with good long-term durability. Widely applicable to.
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