JP3451616B2 - Durability diagnostic method for lightweight cellular concrete - Google Patents
Durability diagnostic method for lightweight cellular concreteInfo
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- JP3451616B2 JP3451616B2 JP35470198A JP35470198A JP3451616B2 JP 3451616 B2 JP3451616 B2 JP 3451616B2 JP 35470198 A JP35470198 A JP 35470198A JP 35470198 A JP35470198 A JP 35470198A JP 3451616 B2 JP3451616 B2 JP 3451616B2
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- alc
- durability
- carbonation
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、建築物の壁や屋
根、床などに使用される軽量気泡コンクリート（ＡＬ
Ｃ）の診断方法に関し、特に、実際の使用段階において
最も重要な問題である耐久性の診断方法に関する。TECHNICAL FIELD The present invention relates to a lightweight aerated concrete (AL) used for walls, roofs, floors, etc. of buildings.
The present invention relates to the diagnostic method C), and particularly to the durability diagnostic method, which is the most important problem in the actual use stage.
【０００２】[0002]
【従来の技術】補強用鉄筋を内蔵して、板状に形成した
ＡＬＣからなるＡＬＣパネルは、建築物の壁や屋根、床
などに使用される。2. Description of the Related Art ALC panels made of plate-shaped ALC having reinforcing bars built-in are used for walls, roofs and floors of buildings.
【０００３】該ＡＬＣパネルは、珪石等の珪酸質原料
と、セメントや生石灰等の石灰質原料とを主原料とし、
これらの微粉末に水とアルミニウム粉末等の添加物を加
えて、スラリー状とした後、補強用鉄筋を配置した型枠
内に流し込み、アルミニウム粉末の反応により発泡さ
せ、石灰質原料の反応により半硬化させて、所定寸法に
形成した後、オートクレーブによる高温高圧水蒸気養生
を行って製造される。該ＡＬＣパネルは、絶乾かさ比重
０．５程度の軽量で、耐火性、断熱性、施工性に優れて
いるため、建築材料として広く使用されている。The ALC panel is mainly composed of siliceous materials such as silica stone and calcareous materials such as cement and quicklime.
Water and aluminum powder and other additives are added to these fine powders to form a slurry, which is then poured into a formwork in which reinforcing bars are placed, foamed by the reaction of the aluminum powder, and semi-cured by the reaction of the calcareous raw material. Then, after being formed into a predetermined size, it is manufactured by performing high temperature high pressure steam curing by an autoclave. Since the ALC panel is lightweight with an absolute dry bulk density of about 0.5 and is excellent in fire resistance, heat insulation and workability, it is widely used as a building material.
【０００４】ＡＬＣパネルを使用する立場から判断する
際、ＡＬＣにひび割れが発生したり、パネル強度が低下
した場合に、ＡＬＣの耐久性は劣化したと認識される。
これは、特に、製造時からの年数が分からないＡＬＣに
対しては、有効な判断手段となる。ＡＬＣの耐久性が劣
化する要因、言い換えるとひび割れの発生やパネル強度
低下の要因は、外的な要因と内的な要因に大別される。When judging from the standpoint of using the ALC panel, it is recognized that the durability of the ALC is deteriorated when the ALC is cracked or the panel strength is lowered.
This is an effective judgment means especially for ALC whose years from the time of manufacture are unknown. The factors that deteriorate the durability of the ALC, in other words, the factors that cause cracking and decrease the panel strength are roughly classified into external factors and internal factors.
【０００５】外的な要因とは、地震や躯体の変形、風圧
などである。これらは、建物の設計や不可避な自然現象
が原因であり、ＡＬＣ自身の問題である場合は少ない。
一方、内的な要因としては、凍害、塩害、炭酸化、乾燥
収縮等が考えられる。External factors include an earthquake, deformation of a skeleton, wind pressure, and the like. These are caused by the design of the building and inevitable natural phenomena, and are rarely problems of ALC itself.
On the other hand, internal factors include frost damage, salt damage, carbonation, drying shrinkage and the like.
【０００６】内的な要因の中で凍害は、寒冷地特有のも
のであり、仕上げやシーリング、窓周りなどの施工方法
によって回避できることから、ＡＬＣ自身の問題ではな
い場合が多い。Of the internal factors, frost damage is peculiar to cold regions and can be avoided by a construction method such as finishing, sealing, and window surroundings, so it is often not a problem of ALC itself.
【０００７】また、ＡＬＣパネルの内部補強用鉄筋には
予め防錆処理（鉄筋防錆）が施されており、塩水による
ＡＬＣの耐久性の劣化は、この鉄筋防錆が不十分である
場合に問題となる。従って、塩害は、正常に製造された
ＡＬＣパネルにおいて、ＡＬＣの耐久性を議論する場合
の要因としては適切でない。In addition, the reinforcing bars for internal reinforcement of the ALC panel have been previously subjected to anticorrosion treatment (corrosion prevention), and the deterioration of the durability of the ALC due to salt water is caused when the anticorrosion is insufficient. It becomes a problem. Therefore, salt damage is not appropriate as a factor when discussing the durability of ALC in a normally manufactured ALC panel.
【０００８】炭酸化とは、ＡＬＣの主要鉱物であるトバ
モライトが、炭酸ガスと水分が存在する環境下で、シリ
カゲルと炭酸カルシウムに分解する反応であり、仕上げ
等の施工が適切に施された場合にも、徐々に進行するこ
とが知られている。また、炭酸化することによりＡＬＣ
は収縮し（炭酸化収縮）、さらに炭酸化したＡＬＣは乾
燥収縮率が大きくなり、乾燥収縮と湿潤膨張の繰り返し
によるひび割れの発生やパネル強度の低下につながるこ
とが懸念される。そこで、ＡＬＣ自身の問題となる劣化
要因としては、炭酸化とそれに伴う長さ変化（炭酸化収
縮と乾燥収縮）に注目することが必要である。Carbonation is a reaction in which tobermorite, which is the main mineral of ALC, is decomposed into silica gel and calcium carbonate in an environment where carbon dioxide gas and water are present. However, it is known that it will progress gradually. In addition, by carbonating ALC
Is contracted (carbonation contraction), and further the carbonized ALC has a large dry contraction rate, which may cause cracking due to repeated dry contraction and wet expansion and a decrease in panel strength. Therefore, it is necessary to pay attention to carbonation and its accompanying change in length (carbonation contraction and drying contraction) as a deterioration factor which is a problem of ALC itself.
【０００９】しかし、これまでＡＬＣの炭酸化と劣化の
関係についてはほとんど分かっていない。従って、ＡＬ
Ｃの耐久性を診断するためには、ひび割れの発生やパネ
ル強度の低下を調べるために、ＡＬＣパネルの仕上げを
取り除いたり、ＡＬＣパネルを取り外して強度試験を行
う等、実際の建築物では実用的でない方法しか無かっ
た。However, until now, little has been known about the relationship between carbonation and deterioration of ALC. Therefore, AL
In order to diagnose the durability of C, in order to investigate the occurrence of cracks and the decrease in panel strength, the ALC panel is removed from the finish, the ALC panel is removed and a strength test is carried out. There was no other way.
【００１０】[0010]
【発明が解決しようとする課題】このような従来の事情
に鑑み、本発明ではＡＬＣの炭酸化と耐久性の劣化との
関係を明らかにし、非常に簡便で迅速な方法により、Ａ
ＬＣの耐久性を診断する方法を提供することを目的とす
る。In view of such conventional circumstances, in the present invention, the relationship between carbonation of ALC and deterioration of durability was clarified, and a very simple and quick method was adopted.
It is an object to provide a method for diagnosing the durability of LC.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するた
め、本発明のＡＬＣの耐久性診断方法では、該ＡＬＣの
炭酸化度を測定し、この炭酸化度が５０％以上であるＡ
ＬＣは、耐久性が劣化したと診断する。In order to achieve the above object, in the method for diagnosing durability of ALC of the present invention, the carbonation degree of the ALC is measured, and the carbonation degree is 50% or more.
LC diagnoses that durability has deteriorated.
【００１２】ここで、炭酸化度は次の手順により得る。
すなわち、当該ＡＬＣの全カルシウム分を定量するため
に、全酸化カルシウム含有量（重量％）を測定する化学
分析を行う。該化学分析は、例えば、ＩＣＰ−ＡＥＳ
（誘導結合プラズマ原子分光分析）を行う。Here, the degree of carbonation is obtained by the following procedure.
That is, in order to quantify the total calcium content of the ALC, a chemical analysis for measuring the total calcium oxide content (% by weight) is performed. The chemical analysis is, for example, ICP-AES.
(Inductively coupled plasma atomic spectroscopy) is performed.
【００１３】また、当該ＡＬＣの炭酸カルシウム分を定
量するために、炭酸ガス含有量（重量％）を測定する熱
分析を行う。該熱分析は、例えば、ＤＴＡ−ＴＧ（示差
熱分析における重量分析）により測定される６００℃〜
８００℃の範囲内に加熱されているときの減少重量か
ら、炭酸ガス含有量（重量％）を算出する。Further, in order to quantify the calcium carbonate content of the ALC, thermal analysis for measuring the carbon dioxide content (% by weight) is performed. The thermal analysis is, for example, 600 ° C. measured by DTA-TG (gravimetric analysis in differential thermal analysis).
The carbon dioxide content (% by weight) is calculated from the weight loss when heated within the range of 800 ° C.
【００１４】そして、炭酸化度（％）は、（炭酸ガス含
有量×５６／４４）／（全酸化カルシウム含有量）×１
００なる式で得る。The degree of carbonation (%) is (carbon dioxide content x 56/44) / (total calcium oxide content) x 1
It is obtained by the formula 00.
【００１５】[0015]
【発明の実施の形態】本発明者らは、ＡＬＣの炭酸化と
耐久性の劣化との関係を調べるため、実際の建物からＡ
ＬＣパネルを取り外し、様々な調査分析を行った。BEST MODE FOR CARRYING OUT THE INVENTION In order to investigate the relationship between carbonation of ALC and deterioration of durability, the inventors of the present invention used an A
The LC panel was removed and various research analyzes were performed.
【００１６】建物履歴として、建築年、部位、方角、建
築時の仕上げ、仕上げ補修とその内容を調べた。As building history, the year of construction, part, direction, finishing at the time of construction, finishing repair and their contents were examined.
【００１７】外観調査として、各ＡＬＣパネルの表裏面
におけるひび割れの有無を目視により確認した。ここ
で、地震や躯体の変形によると思われる大きなひび割れ
は対象とせず、網目状のひび割れだけを対象とした。As a visual inspection, the presence or absence of cracks on the front and back surfaces of each ALC panel was visually confirmed. Here, we did not target large cracks that might be caused by an earthquake or deformation of the skeleton, but only meshed cracks.
【００１８】パネル曲げ強度は、ＪＩＳ規格に準じ、４
等分点２点載荷により試験した。The panel bending strength is 4 according to JIS standard.
The test was carried out by loading two equal points.
【００１９】ブロック圧縮強度は、ＪＩＳ規格に準じ、
ひび割れのないところから９０〜１００ｍｍ角のブロッ
クを切り出して測定した。The block compressive strength conforms to the JIS standard,
A 90 to 100 mm square block was cut out from a place without cracks and measured.
【００２０】乾燥収縮率は、４０ｍｍ×４０ｍｍ×１６
０ｍｍの大きさのサンプルを切り出し、飽水状態から、
ＲＨ４５％において長さ変化が無くなるまでの長さ変化
率として測定した。The dry shrinkage is 40 mm × 40 mm × 16
Cut out a sample with a size of 0 mm,
It was measured as a rate of length change until the length change disappeared at RH of 45%.
【００２１】たわみ率は、ＪＩＳ規格に準じ、２線荷重
試験装置により試験した。The deflection rate was tested by a two-wire load tester according to JIS standard.
【００２２】炭酸化度は、パネルの厚さ方向に５層に均
等に分割し、屋外側表面層について、全酸化カルシウム
（ＣａＯ）含有量（重量％）を、ＩＣＰ−ＡＥＳで測定
し、炭酸ガス（ＣＯ2 ）含有量（重量％）を、ＤＴＡ−
ＴＧによる６００〜８００℃の減少重量から算出し、下
式（数１）から求めた。The degree of carbonation was equally divided into 5 layers in the thickness direction of the panel, and the total calcium oxide (CaO) content (% by weight) of the surface layer on the outdoor side was measured by ICP-AES. The gas (CO 2 ) content (% by weight) was changed to DTA-
It was calculated from the weight loss from 600 to 800 ° C. due to TG, and calculated from the following formula (Equation 1).
【００２３】[0023]
【数１】炭酸化度（％）＝（炭酸ガス含有量×５６／４
４）／（全酸化カルシウム含有量）×１００## EQU1 ## Carbonation degree (%) = (carbon dioxide content × 56/4
4) / (total calcium oxide content) × 100
【００２４】実際の診断のための測定では、ＡＬＣパネ
ルの屋外側表面部分からサンプリングするので、本実施
例では、前記のように５層に分割したうち、屋外側表面
層のサンプルから得られた炭酸化度について測定した。In the actual measurement for diagnosis, sampling is carried out from the surface portion on the outdoor side of the ALC panel. Therefore, in this example, the sample was obtained from the sample of the surface layer on the outdoor side among the five layers as described above. The degree of carbonation was measured.
【００２５】各調査データを、炭酸化度との関係に着目
して図１〜５にプロットした。Each survey data was plotted in FIGS. 1 to 5 focusing on the relationship with the carbonation degree.
【００２６】図１に、ＡＬＣパネルの経過年数と、屋外
側表面部分のＡＬＣの炭酸化度との関係を、ひび割れの
有無の分類と共に示す。FIG. 1 shows the relationship between the age of the ALC panel and the carbonation degree of ALC on the surface portion on the outdoor side, together with the classification of presence or absence of cracks.
【００２７】使用年数が経過するに従って、炭酸化度は
直線的に増加し、２０年以上では、炭酸化度が５０〜６
０％であった。炭酸化度は６０％で飽和し、それ以上に
は増加しなかった。ひび割れの有無の観点では、炭酸化
度が５０〜６０％のサンプルにはすべてひび割れが発生
しており、炭酸化度が０〜５０％のサンプルにはひび割
れが発生していなかった。The degree of carbonation increases linearly as the number of years of use elapses.
It was 0%. The degree of carbonation was saturated at 60% and did not increase further. From the viewpoint of the presence or absence of cracks, all the samples with a carbonation degree of 50 to 60% were cracked, and the samples with a carbonation degree of 0 to 50% were not cracked.
【００２８】図２に、屋外側表面部分のＡＬＣの炭酸化
度と、ＡＬＣパネルのブロック圧縮強度との関係を示
す。FIG. 2 shows the relationship between the carbonation degree of ALC on the surface portion on the outdoor side and the block compressive strength of the ALC panel.
【００２９】炭酸化度が約３０％までのＡＬＣでは、製
造直後と同等のブロック圧縮強度を保持しているが、炭
酸化度が５０〜６０％に増加すると、ブロック圧縮強度
が低下しており、いくつかのサンプルでブロック圧縮強
度のＪＩＳ規格値「３Ｎ／ｍｍ2 以上」を満足していな
い。図１の結果と合わせて考えると、ブロック圧縮強度
の低下は、ひび割れの発生が原因であり、炭酸化が進ん
でもひび割れが発生しなければ、言い換えると、ひび割
れが発生する程度まで炭酸化が進まなければ、ブロック
圧縮強度は低下しないと考えられる。ALC having a carbonation degree of up to about 30% retains the same block compressive strength as immediately after production, but when the carbonation degree increases to 50 to 60%, the block compressive strength decreases. However, some samples do not satisfy the JIS standard value “3 N / mm 2 or more” of block compressive strength. Considering together with the result of FIG. 1, the decrease in the block compressive strength is caused by the occurrence of cracks. If the cracks do not occur even if the carbonation progresses, in other words, the carbonation progresses to the extent that the cracks occur. If not, it is considered that the block compression strength does not decrease.
【００３０】図３に、屋外側表面部分のＡＬＣの炭酸化
度と、ＡＬＣパネルの乾燥収縮率との関係を示す。FIG. 3 shows the relationship between the carbonation degree of ALC on the surface portion on the outdoor side and the dry shrinkage rate of the ALC panel.
【００３１】乾燥収縮率（飽水状態から、ＲＨ４５％ま
での乾燥による収縮率）は製造直後では約０．０３％で
あるが、炭酸化度が５０〜６０％と増加するにつれて、
乾燥収縮率が製造直後に対して約２倍の０．０６〜０．
０７％となり、ＪＩＳ規格値「０．０６％以下」を満足
しなくなる。The dry shrinkage (shrinkage due to drying from the saturated state to RH of 45%) is about 0.03% immediately after production, but as the carbonation degree increases to 50-60%,
The dry shrinkage is about twice as much as that immediately after the production, from 0.06 to 0.
It becomes 07%, and it does not satisfy the JIS standard value "0.06% or less".
【００３２】図４に、屋外側表面部分のＡＬＣの炭酸化
度と、ＡＬＣパネルのパネル曲げ強度との関係を示す。FIG. 4 shows the relationship between the carbonation degree of ALC on the surface portion on the outdoor side and the panel bending strength of the ALC panel.
【００３３】ここで、設計強度が各サンプルごとに異な
るため、パネル曲げ強度を「曲げひび割れモーメント／
設計荷重」として標準化した。図４から、炭酸化度が大
きくなっても、「曲げひび割れモーメント／設計荷重」
は１以上であることが分かる。設計荷重は使用条件に関
して所定の安全率を乗じて設定されているため、パネル
曲げ強度は十分である。一般に、パネル曲げ強度は、主
に補強用鉄筋によって保たれているため、ひび割れが発
生しても低下しないと考えられる。Since the design strength is different for each sample, the panel bending strength is defined as "bending crack moment /
Standardized as "design load". From Fig. 4, even if the carbonation degree becomes large, "bending crack moment / design load"
It can be seen that is 1 or more. Since the design load is set by multiplying a predetermined safety factor in terms of use conditions, the panel bending strength is sufficient. In general, the panel bending strength is mainly maintained by the reinforcing steel bars, so it is considered that the panel bending strength does not decrease even if cracks occur.
【００３４】図５に、屋外側表面部分のＡＬＣの炭酸化
度と、ＡＬＣパネルのたわみ率との関係を示す。FIG. 5 shows the relationship between the degree of carbonation of ALC on the surface portion on the outdoor side and the deflection rate of the ALC panel.
【００３５】たわみ率のＪＩＳ規格値は、「屋根板で
０．００４（１／２５０）以下、外壁では０．００５
（１／２００）以下」である。図５から、炭酸化度が約
３０％まで増加しても、たわみ率がＪＩＳ規格値を満足
しているが、炭酸化度が５０〜６０％に増加すると、た
わみ率がＪＩＳ規格値を外れる。炭酸化度が５０〜６０
％のサンプルではひび割れが発生していたため、たわみ
率が大きくなったと考えられる。The JIS standard value of the deflection rate is "0.004 (1/250) or less for the roof plate and 0.005 for the outer wall.
(1/200) or less ”. From FIG. 5, the deflection rate satisfies the JIS standard value even when the carbonation degree increases to about 30%, but when the carbonation degree increases to 50 to 60%, the deflection rate deviates from the JIS standard value. . Carbonation degree is 50-60
%, The cracks occurred, so it is considered that the deflection rate increased.
【００３６】以上の結果から、屋外側表面部分のＡＬＣ
の炭酸化度が５０％以上であるＡＬＣパネルでは、全て
ひび割れが発生しており、ブロック圧縮強度は低下し、
乾燥収縮率とたわみ率はＪＩＳ規格値から外れる。つま
り、屋外側表面部分のＡＬＣの炭酸化度が５０％以上で
あるＡＬＣパネルは、耐久性が劣化したと判断する本発
明のＡＬＣの耐久性診断方法が有効であることを意味し
ている。From the above results, the ALC of the surface portion on the outdoor side
All of the ALC panels having a carbonation degree of 50% or more had cracks, and the block compressive strength decreased,
The dry shrinkage ratio and the flexural ratio deviate from the JIS standard values. That is, it means that the ALC durability diagnosis method of the present invention, which determines that the durability of the ALC panel whose outdoor side surface portion has a carbonation degree of 50% or more, is deteriorated is effective.
【００３７】本発明のＡＬＣの耐久性診断方法の利点
は、仕上げ層を取り除いてＡＬＣパネルのひび割れを目
視確認する必要や、ＡＬＣパネルを取り外して曲げ強度
を測定する必要がなく、少量のＡＬＣのサンプリングに
より、迅速かつ簡便に耐久性の診断ができることであ
る。The advantage of the method for diagnosing durability of ALC of the present invention is that it is not necessary to remove the finishing layer to visually check for cracks in the ALC panel, and to remove the ALC panel to measure the bending strength. Sampling enables quick and easy diagnosis of durability.
【００３８】（実施例）実ＡＬＣ建築物１６軒のＡＬＣ
表面部分から、１ｇ程度のＡＬＣをサンプリングし、前
述の方法で炭酸化度を測定した。全てのＡＬＣ建築物
は、表面処理（仕上げ）が施されていなかったため、目
視により網目状ひび割れの発生の有無を調査した。結果
を、表１に示す。表１において、撥水性ＡＬＣとは、Ａ
ＬＣの原料の混合時に、適量のポリジメチルシロキサン
を混合したＡＬＣパネルで、吸水率が低い性質を持つ。(Example) ALC of 16 real ALC buildings
About 1 g of ALC was sampled from the surface portion, and the carbonation degree was measured by the method described above. Since all ALC buildings were not surface-treated (finished), the presence or absence of mesh cracks was visually examined. The results are shown in Table 1. In Table 1, water repellent ALC means A
An ALC panel in which an appropriate amount of polydimethylsiloxane is mixed when LC raw materials are mixed, and has a property of low water absorption.
【００３９】[0039]
【表１】 [Table 1]
【００４０】表１から、パネル種類に関わらず、炭酸化
度が５０％以上のＡＬＣパネル９、１０、１５、１６で
は、ひび割れが発生していたことから分かるように、わ
ずかな量のＡＬＣをサンプリングして、炭酸化度を測定
することにより、当該ＡＬＣの耐久性を診断する本発明
の方法が有効であり、極めて顕著な効果を有する。It can be seen from Table 1 that, regardless of the type of panel, in ALC panels 9, 10, 15 and 16 having a carbonation degree of 50% or more, a slight amount of ALC was obtained, as can be seen from the fact that cracking occurred. The method of the present invention for diagnosing the durability of the ALC by sampling and measuring the carbonation degree is effective and has a very remarkable effect.
【００４１】[0041]
【発明の効果】以上、詳細に説明したように、本発明の
方法によれば、仕上げ層を取り除いてＡＬＣパネルのひ
び割れを目視確認する必要や、ＡＬＣパネルを取り外し
て曲げ強度を測定する必要がなく、少量のＡＬＣをサン
プリングすることにより、迅速かつ簡便に耐久性の診断
ができるという極めて顕著な効果を有する。As described above in detail, according to the method of the present invention, it is necessary to remove the finishing layer to visually check for cracks in the ALC panel, or to remove the ALC panel and measure the bending strength. However, by sampling a small amount of ALC, the durability can be diagnosed quickly and easily, which is a very remarkable effect.
【図１】 ＡＬＣパネル経過年数と、屋外側表面部分の
ＡＬＣの炭酸化度の関係を示す相関図である。FIG. 1 is a correlation diagram showing the relationship between the number of years of ALC panel elapsed and the carbonation degree of ALC on the surface portion on the outdoor side.
【図２】 屋外側表面部分のＡＬＣの炭酸化度と、ＡＬ
Ｃパネルのブロック圧縮強度との関係を示す相関図であ
る。[Fig. 2] Carbonation degree of ALC on the outdoor surface and AL
It is a correlation diagram which shows the relationship with the block compression strength of C panel.
【図３】 屋外側表面部分のＡＬＣの炭酸化度と、ＡＬ
Ｃパネルの乾燥収縮率との関係を示す相関図である。[Fig. 3] Carbonation degree of ALC on the outdoor surface and AL
It is a correlation diagram which shows the relationship with the dry shrinkage rate of C panel.
【図４】 屋外側表面部分のＡＬＣの炭酸化度と、ＡＬ
Ｃパネルのパネル曲げ強度との関係を示す相関図であ
る。[Fig. 4] Carbonation degree of ALC on the outdoor surface and AL
It is a correlation diagram which shows the relationship with the panel bending strength of C panel.
【図５】 屋外側表面部分のＡＬＣの炭酸化度と、ＡＬ
Ｃパネルのたわみ率との結果を示す相関図である。FIG. 5: Carbonation degree of ALC on the outdoor surface and AL
It is a correlation diagram which shows the result with the deflection rate of C panel.
フロントページの続き (56)参考文献 特開 平５−52840（ＪＰ，Ａ) 特開 平３−100460（ＪＰ，Ａ) 特開 昭57−77962（ＪＰ，Ａ) 特開 平７−20097（ＪＰ，Ａ) 特開 平11−352123（ＪＰ，Ａ) 特開 平10−267920（ＪＰ，Ａ) 特開 平６−331532（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01N 33/38 Continuation of front page (56) Reference JP-A-5-52840 (JP, A) JP-A-3-100460 (JP, A) JP-A-57-77962 (JP, A) JP-A-7-20097 (JP , A) JP 11-352123 (JP, A) JP 10-267920 (JP, A) JP 6-331532 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB) Name) G01N 33/38
Claims (2)
ム含有量（重量％）および炭酸ガス含有量（重量％）を
測定し、（炭酸ガス含有量×５６／４４）／（全酸化カ
ルシウム含有量）×１００なる式で得られる炭酸化度
（％）が５０％以上である軽量気泡コンクリートは、耐
久性が劣化したと診断する軽量気泡コンクリートの耐久
性診断方法。1. The total calcium oxide content (wt%) and carbon dioxide gas content (wt%) of the lightweight cellular concrete are measured, and (carbon dioxide gas content × 56/44) / (total calcium oxide content) × A lightweight cellular concrete durability diagnosis method for diagnosing that the lightweight cellular concrete having a carbonation degree (%) of 50 or more obtained by the formula 100 is deteriorated in durability.
分光分析）により、全酸化カルシウム含有量（重量％）
を測定し、ＤＴＡ−ＴＧ（示差熱分析における重量分
析）により測定される６００℃〜８００℃の範囲内に加
熱されているときの減少重量から、炭酸ガス含有量（重
量％）を測定する請求項１に記載の軽量気泡コンクリー
トの耐久性診断方法。2. The total calcium oxide content (% by weight) by ICP-AES (inductively coupled plasma atomic spectroscopy).
Is measured, and the carbon dioxide content (% by weight) is measured from the weight loss when heated within the range of 600 ° C. to 800 ° C. measured by DTA-TG (weight analysis in differential thermal analysis). Item 1. A method for diagnosing the durability of lightweight cellular concrete according to Item 1.
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|---|---|---|---|
| JP35470198A JP3451616B2 (en) | 1998-12-14 | 1998-12-14 | Durability diagnostic method for lightweight cellular concrete |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35470198A JP3451616B2 (en) | 1998-12-14 | 1998-12-14 | Durability diagnostic method for lightweight cellular concrete |
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| Publication Number | Publication Date |
|---|---|
| JP2000180437A JP2000180437A (en) | 2000-06-30 |
| JP3451616B2 true JP3451616B2 (en) | 2003-09-29 |
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ID=18439332
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|---|---|---|---|
| JP35470198A Expired - Lifetime JP3451616B2 (en) | 1998-12-14 | 1998-12-14 | Durability diagnostic method for lightweight cellular concrete |
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| Country | Link |
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Cited By (4)
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|---|---|---|---|---|
| JP2010032318A (en) * | 2008-07-28 | 2010-02-12 | Clion Co Ltd | Deterioration diagnosis method of autoclaved lightweight concrete panel |
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| JP3478160B2 (en) * | 1999-03-30 | 2003-12-15 | 住友金属鉱山株式会社 | A method for predicting the useful life of lightweight cellular concrete |
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|---|---|---|---|---|
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