JPH0552840A - Method for measuring carbonating degree of concrete building material - Google Patents
Method for measuring carbonating degree of concrete building materialInfo
- Publication number
- JPH0552840A JPH0552840A JP24257291A JP24257291A JPH0552840A JP H0552840 A JPH0552840 A JP H0552840A JP 24257291 A JP24257291 A JP 24257291A JP 24257291 A JP24257291 A JP 24257291A JP H0552840 A JPH0552840 A JP H0552840A
- Authority
- JP
- Japan
- Prior art keywords
- carbonation
- sample
- building material
- concrete
- measuring
- 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.)
- Withdrawn
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、コンクリート系建材の
炭酸化度の測定方法に関し、例えばユニット住宅のＡＬ
Ｃ（オートクレーブ養生気泡コンクリート）パネルの炭
酸化度の測定方法として好適である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the carbonation degree of a concrete building material, for example, AL of a unit house.
It is suitable as a method for measuring the carbonation degree of a C (autoclave curing aerated concrete) panel.
【０００２】[0002]
【背景技術】通常のコンクリート建材の場合、炭酸化が
問題となるのは、その内部に埋め込まれている鋼材が腐
食するからである。即ち、通常のコンクリートにおける
ポルトランドセメントの主な水和物はポルトランダイト
Ｃａ（ＯＨ）2 であり、このアルカリによって鋼材は腐
食から保護されている。ところが、コンクリートが炭酸
化されると、中性化が起こり、アルカリによる防錆効果
が失われる。鋼材は錆びると体積が膨張し、これによっ
て建材自体が破壊される。BACKGROUND ART In the case of ordinary concrete building materials, carbonation becomes a problem because the steel material embedded therein is corroded. That is, the main hydrate of Portland cement in ordinary concrete is portlandite Ca (OH) 2 , and the alkali protects the steel from corrosion. However, when the concrete is carbonated, it is neutralized, and the rust preventive effect by the alkali is lost. The volume of steel material expands when it rusts, which destroys the building material itself.
【０００３】一方、ユニット住宅用のＡＬＣパネルのよ
うに、高温、高圧下でオートクレーブ養生されている建
材は、通常のコンクリート建材とは組成及び構造が異な
る。主たる水和生成物は、良く結晶化した石灰−シリカ
−水系のものであり、製造後速やかに中性化されるの
で、通常のコンクリート建材のようなアルカリによる保
護効果は得られない。そこで、軽量気泡コンクリートの
場合、鋼材の防錆効果は、鋼材に対する防錆処理によっ
て得ている。On the other hand, building materials that are autoclaved under high temperature and high pressure, such as ALC panels for unit houses, have a different composition and structure from ordinary concrete building materials. The main hydration product is a well-crystallized lime-silica-water system, which is neutralized promptly after production, and therefore cannot provide the protective effect by alkali as in ordinary concrete building materials. Therefore, in the case of lightweight cellular concrete, the anticorrosion effect of the steel material is obtained by the anticorrosion treatment of the steel material.
【０００４】従って、軽量気泡コンクリートでは、炭酸
化による中性化の問題は生じないが、軽量気泡コンクリ
ートにおいても炭酸化の進行に伴って問題が生じる。そ
こで、従来、このような建材の炭酸化を防止するため、
その表面に炭酸ガス透過性の低い塗料を塗布する、建材
内に炭酸化防止用の添加剤を添加する、等の対策が講じ
られている。そして、炭酸化防止の効果を確認するた
め、炭酸化の促進試験を行ってその炭酸化度を測定して
いる。従来、このようなコンクリート系建材の炭酸化度
の測定方法として、フェノールフタレインを使用した
定性的分析方法、炭酸塩を塩酸で分解して生じた炭酸
ガスによる圧力上昇を水銀マノメータで測定する方法等
の化学的測定が行われている。Therefore, the lightweight cellular concrete does not have a problem of carbonation due to carbonation, but the lightweight cellular concrete also has a problem with the progress of carbonation. Therefore, conventionally, in order to prevent carbonation of such building materials,
Measures have been taken such as applying a coating having a low carbon dioxide gas permeability to the surface thereof, adding an additive for preventing carbonation in the building material, and the like. Then, in order to confirm the effect of carbonation prevention, a carbonation acceleration test is performed to measure the carbonation degree. Conventionally, as a method for measuring the carbonation degree of such concrete building materials, a qualitative analysis method using phenolphthalein, a method for measuring the pressure increase due to carbon dioxide gas generated by decomposing carbonate with hydrochloric acid with a mercury manometer. Etc. are chemically measured.
【０００５】[0005]
【発明が解決しようとする課題】上述した従来のコンク
リート系建材の炭酸化度の測定方法は、試料の破砕等の
前処理も必要であり、測定に手間と時間がかかり、また
測定も容易ではないという欠点があった。そこで、本発
明は、炭酸化度を簡易に測定することができるコンクリ
ート系建材の炭酸化度の測定方法を提供することを目的
とする。The above-mentioned conventional method for measuring the carbonation degree of a concrete-based building material requires pretreatment such as crushing of the sample, which requires time and labor for measurement and is not easy to measure. It had the drawback of not having it. Therefore, an object of the present invention is to provide a method for measuring the carbonation degree of a concrete building material, which can easily measure the carbonation degree.
【０００６】[0006]
【課題を解決するための手段】本発明に係るコンクリー
ト系建材の炭酸化度の測定方法は、或る炭酸ガス濃度を
有し、かつ恒温、恒湿の雰囲気中にコンクリート系建材
を配置し、この建材を水分に関して平衡状態にして基本
重量を測定した後、前記炭酸ガス濃度より高められた炭
酸ガス濃度を有し、かつ同じ条件の恒温、恒湿の雰囲気
中に前記建材を配置して、この建材の前記基本重量に対
する重量増加を測定することを特徴とする。前記或る炭
酸ガス濃度とは、通常大気下で測定を行うので、一般に
約0.03vol.％であり、炭酸ガスが含まれていない場合も
含む。The method for measuring the carbonation degree of a concrete-based building material according to the present invention comprises a concrete-based building material having a certain carbon dioxide concentration and being placed in an atmosphere of constant temperature and humidity. After measuring the basic weight of this building material in equilibrium with respect to water, having a carbon dioxide concentration higher than the carbon dioxide concentration, and placing the building material in a constant temperature, constant humidity atmosphere under the same conditions, It is characterized in that an increase in weight of the building material with respect to the basic weight is measured. The certain carbon dioxide concentration is generally about 0.03 vol.% Because it is measured in the atmosphere, and includes the case where carbon dioxide is not contained.
【０００７】[0007]
【作用】建材の試料を炭酸ガス濃度の高い雰囲気中に配
置して炭酸化の促進試験を行った場合、試料の重量変化
に着目すると、一般的に建材成分の炭酸化に伴った炭酸
カルシウム（ＣａＣＯ3 ）の増加量に加えて、吸放湿に
よる水分変化量（通常、吸湿による水分増加量）も含ま
れる。従って、単純に炭酸化の促進試験における試料の
重量変化を測定しても、その重量変化がコンクリートの
炭酸化に伴った炭酸カルシウムの増加量とは一致しな
い。[Function] When a building material sample is placed in an atmosphere with a high carbon dioxide concentration and a carbonation acceleration test is performed, focusing on the weight change of the sample, generally calcium carbonate ( In addition to the increase amount of CaCO 3 ), the change amount of water due to moisture absorption / release (usually, the amount of water increase due to moisture absorption) is also included. Therefore, even if the weight change of the sample in the carbonation acceleration test is simply measured, the weight change does not coincide with the increase amount of calcium carbonate accompanying the carbonation of concrete.
【０００８】そこで、建材試料を水分の影響のない雰囲
気に置き、炭酸化の促進試験における試料の重量変化
を、純粋に建材成分の炭酸化に伴った炭酸カルシウムの
重量増加によるものだけとすれば、試料の重量増加が炭
酸カルシウムの重量増加と一致することになる。これに
より、基本重量に対する試料の重量増加を測定すること
によってコンクリート系建材の炭酸化度を容易に測定す
ることが可能になる。Therefore, if the building material sample is placed in an atmosphere free from the influence of moisture and the weight change of the sample in the carbonation acceleration test is made purely by the increase in the weight of calcium carbonate due to the carbonation of the building material component, , The increase in weight of the sample will coincide with the increase in weight of calcium carbonate. This makes it possible to easily measure the carbonation degree of the concrete building material by measuring the weight increase of the sample with respect to the basic weight.
【０００９】[0009]
【実施例】本発明をＡＬＣパネルの炭酸化度の測定方法
に適用した場合の実施例を説明する。先ず、次のように
して、ＡＬＣパネルと同じ材料よりなる炭酸化度測定用
の試料を作製した。セメントとケイ砂を主原料とし、気
泡が混入されたコンクリートスラリーを成形用型枠内に
流し込み、一次的に硬化させた後、成形された試料を高
温、高圧のオートクレーブ内で蒸気養生させることによ
りＡＬＣ製試料を作製した。EXAMPLE An example in which the present invention is applied to a method for measuring the carbonation degree of an ALC panel will be described. First, a sample for measuring the carbonation degree made of the same material as the ALC panel was prepared as follows. By using cement and silica sand as the main raw materials, a concrete slurry mixed with air bubbles is poured into the mold for molding and temporarily cured, and then the molded sample is steam-cured in a high temperature, high pressure autoclave. An ALC sample was prepared.
【００１０】次に、炭酸ガス透過性が低くなるように適
当な添加剤を添加した塗料を用意し、試料の表面にこの
炭酸化防止塗料を塗布した（この試料を試料１とす
る）。一方、比較のため、前記添加材を添加していない
塗料を用意し、上記と同様に作製した試料の表面にこの
通常の塗料を塗布した（この試料を試料２とする）。Next, a coating material to which appropriate additives were added so that the carbon dioxide gas permeability was low was prepared, and this carbonation-preventing coating material was applied to the surface of the sample (this sample is referred to as sample 1). On the other hand, for comparison, a coating material to which the above-mentioned additive was not added was prepared, and this ordinary coating material was applied to the surface of a sample prepared in the same manner as above (this sample is referred to as sample 2).
【００１１】次に、炭酸化防止塗料の塗布効果を確認す
るため、下記のように両試料について炭酸化の促進試験
を行ってその炭酸化度を本発明に係る方法によって測定
した。例えば温度２５℃、湿度５０％ＲＨ、ＣＯ2 濃度
約0.03vol.％の第１の雰囲気が維持される恒温、恒湿槽
に両試料を入れ、両試料が吸湿することによってそれ以
上重量増加が生じなくなるまで恒温、恒湿槽に放置し
た。そして、水分に関して平衡状態にある両試料の基本
重量をそれぞれ測定した。Next, in order to confirm the application effect of the carbonation-preventing paint, a carbonation acceleration test was conducted on both samples as described below, and the carbonation degree was measured by the method according to the present invention. For example, both samples are placed in a constant temperature / humidity chamber where the temperature is 25 ° C., the humidity is 50% RH, and the first atmosphere having a CO 2 concentration of about 0.03 vol.% Is maintained. It was left in a constant temperature and constant humidity tank until it did not occur. Then, the basic weights of both samples in equilibrium with respect to water content were measured.
【００１２】次に、温度と湿度については同じ２５℃、
５０％ＲＨであるが、ＣＯ2 濃度のみ１０vol.％に高め
た第２の雰囲気が維持される同じ恒温、恒湿槽に両試料
を入れ、毎日定時に両試料の重量をそれぞれ精密に測定
した。この重量測定を２０日間行い、第１の雰囲気での
基本重量に対する増加率をグラフにした結果を図１に示
す。同図で、Ｘ軸が時間（日）、Ｙ軸が重量増加率であ
る。また、曲線Ａは試料１を示し、曲線Ｂは試料２を示
す。この第２の雰囲気において、吸湿による重量増加は
ないため、各試料の重量増加は、コンクリートの炭酸化
によって生成した炭酸カルシウム（ＣａＣＯ3 ）による
ものである。Next, the same temperature and humidity of 25 ° C.,
Both samples were placed in the same constant temperature and constant humidity chamber in which the second atmosphere was maintained at 50% RH but only the CO 2 concentration was raised to 10 vol.%, And the weights of both samples were precisely measured at fixed times every day. .. This weight measurement was carried out for 20 days, and a graph showing the rate of increase with respect to the basic weight in the first atmosphere is shown in FIG. In the figure, the X-axis is the time (days) and the Y-axis is the weight increase rate. Further, the curve A shows the sample 1 and the curve B shows the sample 2. In this second atmosphere, since there is no weight increase due to moisture absorption, the weight increase of each sample is due to calcium carbonate (CaCO 3 ) generated by carbonation of concrete.
【００１３】図１より、試料１によれば、炭酸化防止塗
料を塗布したため、日数が経過しても、大きな重量増加
がみられず、従ってこの試料ではコンクリートの炭酸化
が抑えられていることがわかる。一方、試料２によれ
ば、炭酸化防止効果のない通常の塗料を塗布したため、
日数が経過すると、大きな重量増加がみられ、従ってこ
の試料ではコンクリートの炭酸化が進行していることが
わかる。従って、この炭酸化度の測定方法によって、塗
料に添加された添加剤の炭酸化防止効果が確かめられた
ことになる。From FIG. 1, it can be seen from Sample 1 that the carbonation-preventing paint was applied, so that no significant weight increase was observed even after the elapse of days, and therefore carbonation of concrete was suppressed in this sample. I understand. On the other hand, according to Sample 2, since a normal paint having no carbonation prevention effect was applied,
As the number of days passed, a large weight increase was observed, and thus it can be seen that carbonation of concrete is progressing in this sample. Therefore, the carbonation preventing effect of the additive added to the paint was confirmed by this method of measuring the carbonation degree.
【００１４】上記実施例に係る炭酸化度の測定方法によ
れば、試料を第１の雰囲気に置き、水分に関して平衡状
態にある両試料の基本重量をそれぞれ測定した後、炭酸
ガス濃度のみ１０vol.％に高めた第２の雰囲気に置き、
所定時間毎の両試料の重量増加を測定するだけで、複雑
な操作を伴わないで容易に試料の炭酸化度を測定するこ
とができる。これによって、炭酸化防止処理を施したパ
ネルについての炭酸化防止効果の確認を簡単に行うこと
ができる。また、設備が簡単であるため、この測定方法
を実施するための費用が少なく、更に重量測定だけでよ
いため、操作が容易で、短時間で済むという効果も得ら
れる。According to the method for measuring the carbonation degree according to the above-mentioned embodiment, after placing the sample in the first atmosphere and measuring the basic weights of both samples in equilibrium with respect to water content, only the carbon dioxide concentration is 10 vol. Place it in the second atmosphere, which is
It is possible to easily measure the carbonation degree of the sample without complicated operations by only measuring the weight increase of both samples at every predetermined time. This makes it possible to easily confirm the carbonation-preventing effect of the panel that has been subjected to the carbonation-preventing treatment. Further, since the equipment is simple, the cost for carrying out this measuring method is low, and since only the weight measurement is required, there is an effect that the operation is easy and the time is short.
【００１５】なお、上記実施例は、測定するコンクリー
ト系建材がＡＬＣパネルの場合であったが、ＡＬＣパネ
ル以外のコンクリート系建材、例えばオートクレーブ養
生を施さない常圧養生気泡コンクリートパネルであって
もよい。また、上記実施例では、第１の雰囲気は、大気
下の炭酸ガスが多少含まれた雰囲気であったが、炭酸ガ
スの含まれていない雰囲気としてもよい。Although the concrete building material to be measured is an ALC panel in the above embodiment, a concrete building material other than the ALC panel, for example, a normal pressure cured aerated concrete panel not subjected to autoclave curing may be used. .. Further, in the above-mentioned embodiment, the first atmosphere is an atmosphere containing a little carbon dioxide under the atmosphere, but it may be an atmosphere containing no carbon dioxide.
【００１６】[0016]
【発明の効果】本発明に係るコンクリート系建材の炭酸
化度の測定方法によれば、炭酸化度を簡易に測定するこ
とができる。According to the method for measuring the carbonation degree of the concrete building material according to the present invention, the carbonation degree can be easily measured.
【図１】炭酸化防止塗料を塗布した試料と通常の塗料を
塗布した試料に対して本発明に係る方法で炭酸化度を測
定した結果を示すグラフである。FIG. 1 is a graph showing the results of measuring the carbonation degree by a method according to the present invention for a sample coated with an anti-carbonation coating and a sample coated with a normal coating.
Ａ 炭酸化防止塗料を塗布した試料１ Ｂ 通常の塗料を塗布した試料２ A Sample 1 coated with anti-carbonation paint B Sample 2 coated with normal paint
Claims (1)
湿の雰囲気中にコンクリート系建材を配置し、この建材
を水分に関して平衡状態にして基本重量を測定した後、
前記炭酸ガス濃度より高められた炭酸ガス濃度を有し、
かつ同じ条件の恒温、恒湿の雰囲気中に前記建材を配置
して、この建材の前記基本重量に対する重量増加を測定
することを特徴とするコンクリート系建材の炭酸化度の
測定方法。1. A concrete-based building material having a certain carbon dioxide concentration and being placed in an atmosphere of a constant temperature and a constant humidity, the building material being in an equilibrium state with respect to water, and the basic weight being measured,
Having a carbon dioxide concentration higher than the carbon dioxide concentration,
A method for measuring the carbonation degree of a concrete building material, characterized in that the building material is placed in an atmosphere of constant temperature and humidity under the same conditions, and an increase in weight of the building material with respect to the basic weight is measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24257291A JPH0552840A (en) | 1991-08-27 | 1991-08-27 | Method for measuring carbonating degree of concrete building material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24257291A JPH0552840A (en) | 1991-08-27 | 1991-08-27 | Method for measuring carbonating degree of concrete building material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0552840A true JPH0552840A (en) | 1993-03-02 |
Family
ID=17091071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24257291A Withdrawn JPH0552840A (en) | 1991-08-27 | 1991-08-27 | Method for measuring carbonating degree of concrete building material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0552840A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000283895A (en) * | 1999-03-30 | 2000-10-13 | Sumitomo Metal Mining Co Ltd | Method for predicting durable years of light-weight aerated concrete |
| JP2003035657A (en) * | 2001-07-25 | 2003-02-07 | Sumitomo Kinzoku Kozan Siporex Kk | System for diagnosing degradation of lightweight cellular concrete panel |
| CN108844770A (en) * | 2018-03-30 | 2018-11-20 | 东南大学 | It is a kind of for measuring the slice sampling method of regeneration concrete carbonizing zone micro-structure |
-
1991
- 1991-08-27 JP JP24257291A patent/JPH0552840A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000283895A (en) * | 1999-03-30 | 2000-10-13 | Sumitomo Metal Mining Co Ltd | Method for predicting durable years of light-weight aerated concrete |
| JP2003035657A (en) * | 2001-07-25 | 2003-02-07 | Sumitomo Kinzoku Kozan Siporex Kk | System for diagnosing degradation of lightweight cellular concrete panel |
| CN108844770A (en) * | 2018-03-30 | 2018-11-20 | 东南大学 | It is a kind of for measuring the slice sampling method of regeneration concrete carbonizing zone micro-structure |
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|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19981112 |