JP2503226B2 - Alkali aggregate reaction inhibitor - Google Patents
Alkali aggregate reaction inhibitorInfo
- Publication number
- JP2503226B2 JP2503226B2 JP8389587A JP8389587A JP2503226B2 JP 2503226 B2 JP2503226 B2 JP 2503226B2 JP 8389587 A JP8389587 A JP 8389587A JP 8389587 A JP8389587 A JP 8389587A JP 2503226 B2 JP2503226 B2 JP 2503226B2
- Authority
- JP
- Japan
- Prior art keywords
- aggregate
- alkali
- cement
- concrete
- reaction
- 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
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、アルカリ骨材反応を起し易い反応性骨材、
あるいはアルカリ成分が多いセメント又は混和剤を含有
したコンクリートのアルカリ骨材反応抑制材に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a reactive aggregate that easily causes an alkaline aggregate reaction,
Alternatively, the present invention relates to an alkali-aggregate reaction suppressor for concrete containing cement or an admixture having a large amount of alkali components.
近年、土木建築分野におけるコンクリー施工におい
て、セメント等に含有されるアルカリ成分と骨材の反応
（アルカリ骨材反応）がクローズアップされている。In recent years, in concrete construction in the field of civil engineering and construction, the reaction between an alkaline component contained in cement and the like and an aggregate (alkali aggregate reaction) has been highlighted.
このアルカリ骨材反応とは骨材中の特殊な反応性鉱
物、例えばα−クリストバライト等と、セメントや海砂
に含有されたり、海水や凍結防止剤等の混和剤など外部
から侵入するナトリウム（Na）やカリウム（Ｋ）等のア
ルカリとが、ある条件下で反応し、コンクリートに膨張
ひびわれを持たらす現象であり、一般に反応性シリカ質
が主因であるため、アルカリ−シリカ反応とも考えられ
る。This alkali-aggregate reaction is a special reactive mineral in the aggregate, for example, α-cristobalite or the like, sodium contained in cement or sea sand, or intruding from the outside such as an admixture such as seawater or an antifreezing agent (Na ) Or an alkali such as potassium (K) reacts under certain conditions to cause expansion cracks in the concrete. Generally, the reactive siliceous substance is the main cause, so it is considered to be an alkali-silica reaction.
このアルカリ骨材反応により、珪酸ゲルが生成し、膨
潤することにより、コンクリートにひびわれが発生し、
耐久性の面で大きな問題となつている。By this alkali-aggregate reaction, silica gel is generated and swells, causing cracking in concrete,
It is a big problem in terms of durability.
建設省のコンクリートのアルカリ骨材反応への暫定対
策の骨子は次の４つからなつている。The four main outlines of the Ministry of Construction's provisional countermeasures against the reaction of concrete with alkaline aggregates are as follows.
低アルカリ形セメントを使用する。Use low alkaline cement.
アルカリ骨材反応抑制効果のある混合セメント等を使
用する。Use mixed cement that has the effect of suppressing alkali-aggregate reaction.
アルカリ骨材反応の面で安全と認められる骨材を使用
する。Use aggregate that is recognized as safe in terms of alkaline aggregate reaction.
コンクリートのアルカリ総量をNa2O換算で3.0kg/cm3
以下に制限する。The total amount of alkali in concrete is 3.0 kg / cm 3 in terms of Na 2 O.
Limited to:
又、アルカリ骨材反応はコンクリートの細孔に存在す
る溶液組成、特にアルカリ濃度に関係しており、高炉水
砕スラグはアルカリを固定し、グメリナイトといわれる
アルミニウム・シリケート・ソーダ水和物を生成するこ
とにより、細孔の溶液中のアルカリ濃度を低減し、アル
カリ骨材反応を抑制することが知られている。The alkali-aggregate reaction is related to the solution composition existing in the pores of concrete, especially the alkali concentration. Granulated blast furnace slag fixes alkali and forms aluminum silicate-soda hydrate called gmelinite. It is known that the concentration of alkali in the solution in the pores is thereby reduced and the alkali-aggregate reaction is suppressed.
更に、反応性骨材を微粉末にして添加する方法を提案
されれいる（特開昭61−106449号公報）。しかしなが
ら、本方法では適用範囲が限定され、充分な効果が得ら
れなかつた。Further, a method of adding the reactive aggregate in the form of fine powder has been proposed (JP-A-61-106449). However, the application range of this method is limited, and a sufficient effect cannot be obtained.
本発明者らは、上記問題点を解決する目的で種種検討
した結果、混合セメントあるいは普通ポルトランドセメ
ントに添加する混和材として用いる高炉水砕スラグの組
成をコントロールすることにより、アルカリ骨材反応を
抑制でき、耐久性が向上できる知見を得て本発明を完成
するに到つた。The present inventors, as a result of various studies for the purpose of solving the above problems, suppress the alkali-aggregate reaction by controlling the composition of granulated blast furnace slag used as an admixture to be added to mixed cement or ordinary Portland cement Therefore, the present invention has been completed with the knowledge that the durability can be improved.
即ち、本発明は、Al2O3含有率が12重量％以下である
高炉水砕スラグを用いることを特徴とするコンクリート
のアルカリ骨材反応抑制材である。That is, the present invention is an alkali-aggregate reaction suppressor for concrete, characterized by using granulated blast furnace slag having an Al 2 O 3 content of 12% by weight or less.
以下本発明を詳細に説明する。 The present invention will be described in detail below.
本発明に係るコンクリートは特に限定されるものでは
ないが、反応性骨材、特にアルカリ成分の含有率が多い
反応性骨材を使用するコンクリートには、本発明のアル
カリ骨材反応抑制材（以下抑制材という）は有効であ
る。The concrete according to the present invention is not particularly limited, but the reactive aggregate, particularly the concrete using the reactive aggregate having a high content rate of the alkali component, the alkaline aggregate reaction suppressing material of the present invention (hereinafter Suppressor) is effective.
本発明に係るセメントとしては、普通・早強・超早強
等各種ポルトランドセメント、高炉セメント・フライア
ツシユセメント・シリカセメントの混合セメント及びポ
ルトランドセメントを含まないスラグセメント等が挙げ
られる。Examples of the cement according to the present invention include various types of normal / early-strength / ultra-early-strength portland cement, mixed cement of blast furnace cement / fly-ash cement / silica cement, slag cement containing no portland cement, and the like.
又、本発明に係る骨材としては、コンクリートなどに
使用される骨材であれば特に限定されるものではない
が、反応性の低い骨材を使用することはより好ましい。The aggregate according to the present invention is not particularly limited as long as it is an aggregate used for concrete or the like, but it is more preferable to use an aggregate having low reactivity.
高炉水砕スラグとは、冶金あるいは金属製練等におい
て副生するもので、高炉水砕スラグ（以下単にスラグと
いう）の活性度（水硬性指数）は通常CaO成分（Ｃ）,Mg
O成分（Ｍ）及びAl2O3（Ａ）成分の合計量に対するSiO2
成分（Ｓ）の割合で示され、塩基度＝（Ｃ＋Ｍ＋Ａ）/S
として表わされる。高炉セメントに使用される高炉水砕
スラグの塩基度はJIS R5211で1.4以上と規定されてい
る。Granulated blast furnace slag is a by-product of metallurgy or metal smelting, and the activity (hydraulic index) of granulated blast furnace slag (hereinafter simply referred to as slag) is usually CaO component (C), Mg.
SiO 2 with respect to the total amount of O component (M) and Al 2 O 3 (A) component
Indicated by the ratio of component (S), basicity = (C + M + A) / S
Is represented as The basicity of granulated blast furnace slag used for blast furnace cement is specified by JIS R5211 to be 1.4 or more.
又、スラグの平均的な化学組成は、C:40〜43重量％,
M:5〜８重量％,A:13〜15重量％及びS:31〜35重量％であ
る。The average chemical composition of slag is C: 40-43% by weight,
M: 5-8 wt%, A: 13-15 wt% and S: 31-35 wt%.
現在日本で製造されているスラグのＡ含有率はほとん
ど14重量％以上である。Most of the slags currently produced in Japan have an A content of 14% by weight or more.
本発明に係るスラグは、Ａ含有率が12重量％以下のも
のである。Ａ含有率が12重量％以下のスラグは、Ｃ源,M
源,A源,S源等をＡ源が12重量％以下となるよう混合して
製造できる。The slag according to the present invention has an A content of 12% by weight or less. A slag with an A content of 12% by weight or less is a C source, M
A source, A source, S source, etc. can be mixed and produced so that the A source is 12% by weight or less.
本発明に係るスラグの使用量はセメント100重量部に
対し20重量部以上が好ましく、50重量部以上が更に好ま
しい。The use amount of the slag according to the present invention is preferably 20 parts by weight or more, and more preferably 50 parts by weight or more with respect to 100 parts by weight of cement.
20重量部未満では、効果が低く、多いほど好ましい。 When the amount is less than 20 parts by weight, the effect is low, and the more the amount is, the more preferable.
アルカリ骨材反応（以下アル骨反応という）を判定す
る試験方法としては、骨材の反応性を調べるASTM C−28
9の化学法とモルタルの膨張率を測定するASTM C−227の
モルタルバー法がある。As a test method for determining the alkaline-aggregate reaction (hereinafter referred to as “al-bone reaction”), ASTM C-28 for examining the reactivity of the aggregate is used.
There are 9 chemical methods and ASTM C-227 mortar bar method to measure the expansion coefficient of mortar.
本発明の抑制材の混合方法は、特に限定されるもので
はなく、又、コンクリートに通常使用される種々の混和
剤を併用することももちろん可能である。The method for mixing the suppressor of the present invention is not particularly limited, and it is of course possible to use various admixtures commonly used in concrete together.
以下実施例を挙げて本発明を更に説明する。 The present invention will be further described with reference to examples.
実施例 反応性骨材のオパール珪石（α−クリストバライト
系）（以下オパールという）及び、ASTM C−289化学法
により無害と判定された川砂を表−１の粒度分布のよう
に粉砕、ふるい分けを行い表−２の割合で混合した。Example Reactive aggregate opal silica stone (α-cristobalite type) (hereinafter referred to as opal) and river sand determined to be harmless by the ASTM C-289 chemical method were pulverized and sieved according to the particle size distribution shown in Table 1. It mixed in the ratio of Table-2.
使用したスラグの化学組成を表−３、特性を表−４に
示す。 Table 3 shows the chemical composition of the slag used, and Table 4 shows the characteristics.
次にコンクリートの耐久性の促進効果をみるため次の
試験を実施した。試験に用いた、セメント組成を表−５
に示す。 Next, the following tests were carried out to see the effect of promoting the durability of concrete. Table 5 shows the cement composition used in the test.
Shown in
アル骨反応による膨張率測定はASTM C−227のモルタ
ルバーに準じて行つた。 The expansion coefficient measurement by the Al-Bone reaction was performed according to the mortar bar of ASTM C-227.
（１） モルタル供試体の作製 モルタルの混練 セメント及び骨材を1:2になるようモルタルミキサー
に投入し、フロー値が200±10mmに入るように混練水を
調整しながら低速で30秒、高速で１分間混練した。(1) Preparation of mortar specimen Kneading of mortar Mix cement and aggregate into a mortar mixer at a ratio of 1: 2 and adjust the kneading water so that the flow value will be 200 ± 10 mm, at a low speed for 30 seconds and at a high speed. And kneaded for 1 minute.
モルタル供試体の作製 モルタル混練後直ちに型枠（JIS規格４×４×16cm）
に投入した。また膨張率測定用のボルトの供試体への埋
め込みを行つた。Preparation of mortar specimen Form immediately after mortar kneading (JIS standard 4 x 4 x 16 cm)
I put it in. In addition, a bolt for measuring the expansion coefficient was embedded in the test piece.
（２） 養生方法 モルタル成型後20℃、90％R.H.以上で24±２時間養生 脱型後基長（ダイヤルゲージ法）。(2) Curing method Curing at 20 ° C and 90% RH for 24 ± 2 hours after mortar molding. Base length after demolding (dial gauge method).
40℃、90％R.H.以上で所定林令まで養生。Cured at 40 ℃ and 90% RH or above until the designated forest age.
測定前には16時間以上20℃、90％R.H.以上の状態に置
く。Before measurement, keep at 20 ℃, 90% RH or more for 16 hours or more.
測長はダイヤルケージを使用 測定後は40℃、90％R.H.以上の状態に戻す。Use a dial cage for length measurement. After measurement, return to 40 ° C, 90% RH or higher.
測定結果を表−５に示す。 The measurement results are shown in Table-5.
比較例である実験No.1,2においては１ケ月材令前に膨
張によるクラックの発生が認められたが、実施例である
実験No.3,4,5では観察されなかつた。本発明による実施
例の膨張量は比較例と比べ著しく少ないことがわかつ
た。 In Comparative Experiments Nos. 1 and 2, cracking due to expansion was observed one month before the age, but it was not observed in Experimental Nos. 3, 4 and 5. It was found that the expansion amount of the example according to the present invention was significantly smaller than that of the comparative example.
以上の如く、本発明の抑制材を用いるとアルカリ含有
量が数％と極端に多く、反応性骨材を含むコンクリート
においてアル骨反応による膨張はほとんど無く、コンク
リートの耐久性を向上させることができる。従つて、こ
れまで慎重な対策を必要とした条件でも本発明によれば
スラグの組成を特定化することにより容易に対応するこ
とが可能となつた。As described above, when the inhibitor of the present invention is used, the alkali content is extremely high at several%, and the concrete containing the reactive aggregate hardly expands due to the Al-bone reaction, and the durability of the concrete can be improved. . Therefore, according to the present invention, it is possible to easily deal with the condition requiring careful measures so far by specifying the composition of the slag.
Claims (1)
砕スラグを用いることを特徴とするコンクリートのアル
カリ骨材反応抑制材。1. A material for suppressing alkali-aggregate reaction in concrete, which comprises granulated blast furnace slag having an Al 2 O 3 content of 12% by weight or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8389587A JP2503226B2 (en) | 1987-04-07 | 1987-04-07 | Alkali aggregate reaction inhibitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8389587A JP2503226B2 (en) | 1987-04-07 | 1987-04-07 | Alkali aggregate reaction inhibitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63252948A JPS63252948A (en) | 1988-10-20 |
| JP2503226B2 true JP2503226B2 (en) | 1996-06-05 |
Family
ID=13815367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8389587A Expired - Lifetime JP2503226B2 (en) | 1987-04-07 | 1987-04-07 | Alkali aggregate reaction inhibitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2503226B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006168997A (en) * | 2003-11-20 | 2006-06-29 | Mitani Sekisan Co Ltd | High-strength concrete-molded body and material to be charged in mold |
| JP4843271B2 (en) * | 2005-07-22 | 2011-12-21 | 宇部興産株式会社 | Cement composition for inhibiting alkali silica reaction and cement-containing composition |
| JP5102502B2 (en) * | 2007-01-24 | 2012-12-19 | 太平洋セメント株式会社 | Cement additive and cement composition |
| JP6690273B2 (en) * | 2015-05-18 | 2020-04-28 | 宇部興産株式会社 | Cement composition and method for producing the same |
-
1987
- 1987-04-07 JP JP8389587A patent/JP2503226B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63252948A (en) | 1988-10-20 |
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