JPH03290341A - Admixture for high-strength concrete - Google Patents
Admixture for high-strength concreteInfo
- Publication number
- JPH03290341A JPH03290341A JP8818590A JP8818590A JPH03290341A JP H03290341 A JPH03290341 A JP H03290341A JP 8818590 A JP8818590 A JP 8818590A JP 8818590 A JP8818590 A JP 8818590A JP H03290341 A JPH03290341 A JP H03290341A
- Authority
- JP
- Japan
- Prior art keywords
- strength
- concrete
- admixture
- cement
- acid ester
- 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.)
- Granted
Links
- 239000011372 high-strength concrete Substances 0.000 title claims description 9
- -1 hydroxycarboxylic acid ester Chemical class 0.000 claims abstract description 21
- 239000003945 anionic surfactant Substances 0.000 claims abstract description 9
- 150000001875 compounds Chemical class 0.000 claims abstract description 9
- 229920001461 hydrolysable tannin Polymers 0.000 claims abstract description 5
- 150000002596 lactones Chemical class 0.000 claims abstract description 5
- 239000002075 main ingredient Substances 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 24
- 235000013824 polyphenols Nutrition 0.000 abstract description 7
- 229920001864 tannin Polymers 0.000 abstract description 4
- 235000018553 tannin Nutrition 0.000 abstract description 4
- 239000001648 tannin Substances 0.000 abstract description 4
- 230000020169 heat generation Effects 0.000 abstract description 3
- 230000036571 hydration Effects 0.000 abstract description 2
- 238000006703 hydration reaction Methods 0.000 abstract description 2
- 239000003513 alkali Substances 0.000 abstract 1
- 150000001720 carbohydrates Chemical class 0.000 abstract 1
- 239000004568 cement Substances 0.000 description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 235000000346 sugar Nutrition 0.000 description 8
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 150000008163 sugars Chemical class 0.000 description 4
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- LNTHITQWFMADLM-UHFFFAOYSA-N gallic acid Chemical compound OC(=O)C1=CC(O)=C(O)C(O)=C1 LNTHITQWFMADLM-UHFFFAOYSA-N 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000000979 retarding effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- NUYDBDGECBIUPJ-FJPOHGBRSA-N (3r,4s,5r)-3,4-dihydroxy-5-[(1s,2r,3r)-1,2,3,4-tetrahydroxybutyl]oxolan-2-one Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H]1OC(=O)[C@H](O)[C@@H]1O NUYDBDGECBIUPJ-FJPOHGBRSA-N 0.000 description 1
- TUSDEZXZIZRFGC-UHFFFAOYSA-N 1-O-galloyl-3,6-(R)-HHDP-beta-D-glucose Natural products OC1C(O2)COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC1C(O)C2OC(=O)C1=CC(O)=C(O)C(O)=C1 TUSDEZXZIZRFGC-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- HGJXAVROWQLCTP-YABCKIEDSA-N Chebulagic acid Chemical compound O([C@H]1[C@H]2[C@H]3OC(=O)C4=CC(O)=C(O)C(O)=C4C4=C(O)C(O)=C(O)C=C4C(=O)OC[C@@H](O1)[C@H]3OC(=O)[C@@H](CC(O)=O)[C@@H]1[C@@H](C(OC=3C(O)=C(O)C=C(C1=3)C(=O)O2)=O)O)C(=O)C1=CC(O)=C(O)C(O)=C1 HGJXAVROWQLCTP-YABCKIEDSA-N 0.000 description 1
- 229920002052 Chebulagic acid Polymers 0.000 description 1
- PHOQVHQSTUBQQK-SQOUGZDYSA-N D-glucono-1,5-lactone Chemical compound OC[C@H]1OC(=O)[C@H](O)[C@@H](O)[C@@H]1O PHOQVHQSTUBQQK-SQOUGZDYSA-N 0.000 description 1
- CIWBSHSKHKDKBQ-DUZGATOHSA-N D-isoascorbic acid Chemical compound OC[C@@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-DUZGATOHSA-N 0.000 description 1
- SBJKKFFYIZUCET-JLAZNSOCSA-N Dehydro-L-ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(=O)C1=O SBJKKFFYIZUCET-JLAZNSOCSA-N 0.000 description 1
- SBJKKFFYIZUCET-UHFFFAOYSA-N Dehydroascorbic acid Natural products OCC(O)C1OC(=O)C(=O)C1=O SBJKKFFYIZUCET-UHFFFAOYSA-N 0.000 description 1
- 239000001263 FEMA 3042 Substances 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 1
- LRBQNJMCXXYXIU-PPKXGCFTSA-N Penta-digallate-beta-D-glucose Natural products OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-PPKXGCFTSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 235000010323 ascorbic acid Nutrition 0.000 description 1
- 239000011668 ascorbic acid Substances 0.000 description 1
- 229960005070 ascorbic acid Drugs 0.000 description 1
- VEZXCJBBBCKRPI-UHFFFAOYSA-N beta-propiolactone Chemical compound O=C1CCO1 VEZXCJBBBCKRPI-UHFFFAOYSA-N 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 229930188620 butyrolactone Natural products 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical class OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 150000001733 carboxylic acid esters Chemical class 0.000 description 1
- UGIVASYMZSZAMP-UHFFFAOYSA-N chebulagic acid Natural products OC1C2c3c(OC1=O)c(O)c(O)cc3C(=O)OC4C(OC(=O)c5cc(O)c(O)c(O)c5)OC6COC(=O)c7cc(O)c(O)c(O)c7c8c(O)c(O)c(O)cc8C(=O)OC4C6OC(=O)C2(O)C(=O)O UGIVASYMZSZAMP-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 235000020960 dehydroascorbic acid Nutrition 0.000 description 1
- 239000011615 dehydroascorbic acid Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- COVFEVWNJUOYRL-UHFFFAOYSA-N digallic acid Chemical compound OC(=O)C1=CC(O)=C(O)C(OC(=O)C=2C=C(O)C(O)=C(O)C=2)=C1 COVFEVWNJUOYRL-UHFFFAOYSA-N 0.000 description 1
- 235000010350 erythorbic acid Nutrition 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- RRDQTXGFURAKDI-UHFFFAOYSA-N formaldehyde;naphthalene-2-sulfonic acid Chemical compound O=C.C1=CC=CC2=CC(S(=O)(=O)O)=CC=C21 RRDQTXGFURAKDI-UHFFFAOYSA-N 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 235000004515 gallic acid Nutrition 0.000 description 1
- 229940074391 gallic acid Drugs 0.000 description 1
- 235000012209 glucono delta-lactone Nutrition 0.000 description 1
- 229960003681 gluconolactone Drugs 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229940026239 isoascorbic acid Drugs 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 229960000380 propiolactone Drugs 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 description 1
- 229920002258 tannic acid Polymers 0.000 description 1
- 235000015523 tannic acid Nutrition 0.000 description 1
- 229940033123 tannic acid Drugs 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、高強度コンクリートを得る目的で使用される
混和剤の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in admixtures used for the purpose of obtaining high strength concrete.
一般に減水剤は、水セメント比を減じて早期脱型を可能
にし、高強度を得る目的で使用されるコンクリートの混
和剤であり、リグニンスルホン酸塩、オキシカルボン酸
、芳香族スルホン融塩縮合物などの界面活性剤が用いら
れている。In general, water reducers are concrete admixtures used to reduce the water-cement ratio, enable early demolding, and obtain high strength. Surfactants such as are used.
ところで近年の建設技術の進歩に伴い、コンクリートの
高強度化が図られている。例えば設計基準強度で４００
ｋｇｆ／ａｍ２程度のものは実際に使用され、６００ｋ
ｇｆ／ｃｍ”の強度のコンクリートも実用に供されてい
る。さらに、１００１００Ｏ／ｃｍ２以上の強度が目標
となっている。これらは、所謂ＮＥＷ−ＲＣ工法などの
新しい工法には必要な材料となっている。そして、この
ような高強度のコンクリートを製造する場合、一般には
上述の高性能減水剤を添加し、水セメント比を従来より
１０％以上低下させることで、コンクリートの高強度を
得るようにしている。However, with recent advances in construction technology, efforts are being made to increase the strength of concrete. For example, the design standard strength is 400
About kgf/am2 is actually used, 600k
Concrete with a strength of 100,100 O/cm2 is also in practical use.In addition, concrete with a strength of 100,100 O/cm2 or more is being targeted.These are materials that are necessary for new construction methods such as the so-called NEW-RC construction method. When producing such high-strength concrete, the high-performance water reducing agent mentioned above is generally added to lower the water-cement ratio by at least 10% compared to conventional methods, thereby increasing the strength of the concrete. I have to.
しかし、このように高性能減水剤を添加して水セメント
比を減じた場合、単位セメント量が５００ｋｇ／ｍ３〜
６ＤＯｋｇ／ｍ”にも達してしまうことになる。そのた
め、従来温度上昇は無視できた薄い部材においてもセメ
ントの発熱に伴うコンクリートの温度上昇が無視できな
くなり、コンクリートのひび割れの原因となったり、実
部材においてコンクリートの初期強度は出るものの、２
８日強度はあまり伸びないといった問題があった。その
ため、さらに単位セメント量を増して強度アップを図る
必要が生じ、これが発熱をさらに促進して悪循環となっ
てしまうという問題があった。However, if the water-cement ratio is reduced by adding a high-performance water reducer in this way, the unit cement amount will be 500 kg/m3 or more.
6DOkg/m”.As a result, even in thin members where the temperature rise could be ignored in the past, the temperature rise in the concrete due to the heat generated by the cement can no longer be ignored, causing cracks in the concrete and causing serious problems. Although the initial strength of concrete is obtained in the members, 2
There was a problem that the strength did not increase much on the 8th day. Therefore, it becomes necessary to further increase the unit amount of cement to increase the strength, which further promotes heat generation, creating a vicious cycle.
そこで本発明の技術的課題は、実部材における２８日強
度がより大きく、マスコンクリートなどでも安定した強
度を得ることのできる混和剤を提供することにある。Therefore, the technical problem of the present invention is to provide an admixture that has higher 28-day strength in actual parts and can provide stable strength in mass concrete and the like.
（課題を解決するための手段）
本発明者等は、これらの問題点を解決するために鋭意研
究し本発明を完成するに至った。(Means for Solving the Problems) In order to solve these problems, the present inventors conducted extensive research and completed the present invention.
即ち、本発明者等は種々の有機材料をコンクリートに添
加して温度上昇量、流動性ならびに強度発現性を調べた
ところ、ヒドロキシカルボン酸エステルとアニオン系界
面活性剤との組み合わせがコンクリートの強度を著しく
増大し、力）つマスコンクリートにおいても温度の上昇
が小さく強度低下が抑えられることを見い出した。That is, the present inventors added various organic materials to concrete and investigated the temperature rise, fluidity, and strength development, and found that the combination of hydroxycarboxylic acid ester and anionic surfactant increased the strength of concrete. It has been found that even in mass concrete, where there is a significant increase in strength and strength, the rise in temperature is small and the decrease in strength is suppressed.
このように、本発明は高強度コンクリートの混和剤とし
て、ヒドロキシカルボン酸エステルとアニオン系界面活
性剤とからなる混和剤を手段とする。As described above, the present invention uses an admixture consisting of a hydroxycarboxylic acid ester and an anionic surfactant as an admixture for high-strength concrete.
以下本発明の詳細な説明する。The present invention will be explained in detail below.
ここで言うヒドロキシカルボン酸エステルとは、同一分
子内に水酸基とカルボン酸エステルを持つものであり、
特に加水分解性タンニン化合物やラクトン類が挙げられ
る。加水分解性タンニン化合物は主としてフェノール性
カルボン酸と糖がエステル結合をしており、セメントの
ようなアルカリ性物質存在下で徐々に加水分解してフェ
ノール性カルボン酸と糖を生成する。これらの物質はセ
メントの水利に与える影響が著しく異なっており、タン
ニン化合物は比較的弱い遅延作用であるのに対して、生
成するフェノール性カルボン酸と糖は非常に強い遅延作
用がある。そのために加水分解速度の大きい高温では、
常温でのセメントの水利と比べて大きな遅延作用を生じ
る。これは水溶性でかつ徐々に加水分解して、タンニン
化合物よりさらにセメントの水利を遅延する効果の太き
な低分子量のフェノール性カルボン酸と糖が生成し、セ
メントの水和を徐々に抑えて、コンクリートの温度上昇
速度を低下させるためである。The hydroxycarboxylic acid ester mentioned here has a hydroxyl group and a carboxylic acid ester in the same molecule,
In particular, hydrolyzable tannin compounds and lactones may be mentioned. Hydrolyzable tannin compounds mainly consist of ester bonds between phenolic carboxylic acids and sugars, and are gradually hydrolyzed in the presence of alkaline substances such as cement to produce phenolic carboxylic acids and sugars. These substances differ markedly in their effects on cement water availability, with the tannin compounds having a relatively weak retarding effect, whereas the phenolic carboxylic acids and sugars produced have a very strong retarding effect. Therefore, at high temperatures where the rate of hydrolysis is high,
Compared to cement water use at room temperature, it causes a large delay effect. It is water-soluble and gradually hydrolyzes to produce low-molecular-weight phenolic carboxylic acids and sugars that are more effective than tannin compounds in delaying cement's water utilization, gradually suppressing cement's hydration. This is to reduce the temperature rise rate of concrete.
ヒドロキシカルボン酸エステルの一種であるラクトン類
も加水分解によって遅延性の大きいヒドロキシカルボン
酸塩となり、上述のタンニン化合物と同様の効果を有す
る。Lactones, which are a type of hydroxycarboxylic acid ester, also become hydroxycarboxylic acid salts with a large delay property through hydrolysis, and have the same effects as the above-mentioned tannin compounds.
本発明における加水分解性のタンニン化合物としては、
フェノール性カルボン酸と糖がエステル結合した、ｇａ
ｌｌｏｔａｎｎｉｎ 、 ｃｏｒｉｌａｇｉｎ 。Hydrolyzable tannin compounds in the present invention include:
ga, an ester bond of phenolic carboxylic acid and sugar
llotannin, colilagin.
ｃｈｅｂｕｌａｇｉｃ ａｃｉｄ及びｃｈｅｂｕｌｉｎ
ｉｃ ａｃｉｄなどの物質を主成分とする物質や、タン
ニン酸として知られるｍ−ガロイル没食子酸などがある
。そして、これらの物質は酸性およびアルカリ性で加水
分解を起こしやすく、加水分解により没食子酸、エラー
グ酸、糖などになる。chebulagic acid and chebulin
There are substances whose main components are substances such as ic acid, and m-galloyl gallic acid, which is known as tannic acid. These substances are easily hydrolyzed in acidic and alkaline conditions, and hydrolyzed into gallic acid, erlagic acid, sugar, etc.
ラクトン類とはブチロラクトン、プロピオラクトンなど
の分子内エステルを意味するが、特に本発明では糖誘導
体のグルコノラクトン、グルコヘプトン酸−γ−ラクト
ン、糖酸−１，４−ラクトン、α、β−グルコオクタン
酸−γ−ラクトンやアスコルビン酸、デヒドロアスコル
ビン酸、イソアスコルビン酸などが望ましい。Lactones refer to intramolecular esters such as butyrolactone and propiolactone, but in the present invention, in particular, sugar derivatives such as gluconolactone, glucoheptonic acid-γ-lactone, sugar acid-1,4-lactone, α, β- Glucooctanoic acid-γ-lactone, ascorbic acid, dehydroascorbic acid, isoascorbic acid, etc. are preferable.
また、ここで言うアニオン系界面活性剤には、リグニン
スルホン酸塩、β−ナフタレンスルホン酸ホルムアルデ
ヒド縮合物塩、メラミンスルホン酸ホルムアルデヒド縮
合物塩、オキシカルボン酸またはその塩、ポリアルキル
アリルスルホン酸塩などがある。In addition, the anionic surfactants mentioned here include lignin sulfonate, β-naphthalene sulfonic acid formaldehyde condensate salt, melamine sulfonic acid formaldehyde condensate salt, oxycarboxylic acid or its salt, polyalkylaryl sulfonate, etc. There is.
混和剤はヒドロキシカルボン酸エステルとアニオン系界
面活性剤を主剤としているが、これにＡＥ剤や消泡剤、
増粘剤（メチルセルロースなど）が必要に応じて添加さ
れる。ヒドロキシカルボン酸エステルとアニオン系界面
活性剤との比率は固形分で１：０．０１〜ｌ：１０であ
る。このとき、粉体同士を混合しても良いし、又は液体
同士を混合しても良い。必要に応じて水で希釈して用い
る。また、高強度コンクリートの製造において、混和剤
は固形分でセメント量の０．１％〜４％の範囲で添加す
るのが望ましい。The admixture is mainly composed of hydroxycarboxylic acid ester and anionic surfactant, but it also contains AE agents, antifoaming agents,
Thickeners (such as methylcellulose) are added if necessary. The ratio of hydroxycarboxylic acid ester to anionic surfactant is 1:0.01 to 1:10 in terms of solid content. At this time, powders may be mixed together, or liquids may be mixed together. Dilute with water if necessary. Further, in the production of high-strength concrete, it is desirable to add the admixture in a solid content in the range of 0.1% to 4% of the amount of cement.
セメントへの添加は、粉体として前もってセメントと混
合しておいても良いし、水溶性なのでセメントの混練水
中に溶解させて使用しても良い。When adding to cement, it may be mixed with cement in advance as a powder, or since it is water-soluble, it may be dissolved in cement mixing water.
本発明の混和剤を添加使用することのできるセメントと
しては、普通、中庸熱、早強、超早強、耐硫酸塩、白色
ポルトランドセメントやシリカセメント、フライアッシ
ュセメント、高炉セメントなどの混合セメント、或いは
カルシウムアルミネートを主成分とするアルミナセメン
トやＣ１１ＡｙＣａＦ２を主成分とする超速硬セメント
やカルシウムサルフォアルミネート（Ｃ４Ａ５Ｓ）を用
いた特殊セメントなどがある。Examples of cements to which the admixture of the present invention can be added include ordinary, medium heat, early strength, super early strength, sulfate resistant, mixed cements such as white Portland cement, silica cement, fly ash cement, and blast furnace cement; Alternatively, there are alumina cement containing calcium aluminate as the main component, ultra-fast hardening cement containing C11AyCaF2 as the main component, and special cement using calcium sulfoaluminate (C4A5S).
以上説明したように、従来の高性能減水剤を使用した高
強度コンクリートは暑中では所定の強度が得られず、特
にマスコンクリートでは温度上昇が激しいため、より強
度が伸びない傾向にあったが、本発明に係る混和剤を用
いると、特に発熱が大きいマスコンクリートにおいても
強度低下が少なく、高強度を安定して得ることができる
。As explained above, high-strength concrete using conventional high-performance water-reducing agents cannot achieve the required strength in hot weather, and mass concrete in particular tends to have less strength due to the rapid rise in temperature. When the admixture according to the present invention is used, even in mass concrete which generates a large amount of heat, there is little decrease in strength and high strength can be stably obtained.
（実施例〕 以下に、本発明の実施例を詳しく説明する。(Example〕 Examples of the present invention will be described in detail below.
（１）コンクリートへの混和剤の配合
本実施例に用いたコンクリートの配合割合及び混和剤の
配合を表−１に示す。この中でＮｏ、１及びＮ０２２は
本実施例の試料を、Ｎ００３〜Ｎ０９５は比較例の試料
をそれぞれ示す。(1) Mixing of admixtures into concrete Table 1 shows the mix ratio of concrete and the mix of admixtures used in this example. Among them, No. 1 and No. 022 represent samples of this example, and No. 003 to No. 095 represent samples of comparative examples.
ここで、ヒドロキシカルボン酸エステルは市販品を使用
した。Here, a commercially available hydroxycarboxylic acid ester was used.
また、減水剤としては、マイティ１５０（花王社製）、
ホゾリスＮＬ４０００（日曹マスタービルダーズ社製）
を使用した。In addition, as a water reducing agent, Mighty 150 (manufactured by Kao Corporation),
Hozolith NL4000 (manufactured by Nisso Master Builders)
It was used.
表−１
（２）コンクリートの物性試験
試験方法は、ＪＩＳ Ａ１１０８（コンクリートの圧縮
強度試験方法）による。物性試験の結果を表−２に示す
。Table 1 (2) Physical property test of concrete The test method is based on JIS A1108 (concrete compressive strength test method). The results of the physical property tests are shown in Table-2.
Ｎ０１１とＮ００２は温度上昇が小さく、また強度低下
も少ないことを示している。N011 and N002 show that the temperature increase is small and the strength decrease is also small.
表−３
表−２より明らかなように、本発明ではスランプ及び２
８日強度のいずれもが向上している。Table 3 As is clear from Table 2, in the present invention, slump and 2
All of the strength levels improved on the 8th day.
（３）温度およびコア供試体の強度試験上記Ｎ０２１〜
Ｎ０９５までのコンクリートをＬＩＸＷＩＸＨｌｍの型
枠の中にそれぞれ打設し、中心部分の温度を熱電対で測
定し、また供試体の強度を測定した。最高到達温度およ
びコア供試体の強度を表−３に示す。(3) Temperature and strength test of core specimen No.021~
Concrete up to N095 was poured into LIXWIXHlm formwork, and the temperature at the center was measured with a thermocouple, and the strength of the specimen was also measured. Table 3 shows the maximum temperature reached and the strength of the core specimen.
この表−３からも明らかなように、本実施例の〔発明の
効果〕
以上説明したように、本発明に係る混和剤はヒドロキシ
カルボン酸エステルとアニオン系界面活性剤を主剤とし
たことて、コンクリートの水利発熱を抑制して２８日強
度を増すといった効果があり、特にマスコンクリートで
は温度上昇を抑制し、高強度コンクリートを実部材にお
いても安定して得ることができるといった効果を奏する
。As is clear from Table 3, [Effects of the Invention] of this Example As explained above, the admixture according to the present invention has a hydroxycarboxylic acid ester and an anionic surfactant as main ingredients. It has the effect of suppressing water heat generation in concrete and increasing its strength within 28 days, and is particularly effective in suppressing temperature rise in mass concrete, making it possible to stably obtain high-strength concrete even in actual parts.
Claims (2)
活性剤を主剤とする高強度コンクリート用混和剤。(1) A high-strength concrete admixture whose main ingredients are a hydroxycarboxylic acid ester and an anionic surfactant.
ニン化合物またはラクトン類であることを特徴とする請
求項１記載の高強度コンクリート用混和剤。(2) The admixture for high-strength concrete according to claim 1, wherein the hydroxycarboxylic acid ester is a hydrolyzable tannin compound or lactone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8818590A JP2591686B2 (en) | 1990-04-04 | 1990-04-04 | High-strength concrete admixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8818590A JP2591686B2 (en) | 1990-04-04 | 1990-04-04 | High-strength concrete admixture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03290341A true JPH03290341A (en) | 1991-12-20 |
| JP2591686B2 JP2591686B2 (en) | 1997-03-19 |
Family
ID=13935847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8818590A Expired - Fee Related JP2591686B2 (en) | 1990-04-04 | 1990-04-04 | High-strength concrete admixture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2591686B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012148933A (en) * | 2011-01-20 | 2012-08-09 | Sumitomo Osaka Cement Co Ltd | Cement composition |
-
1990
- 1990-04-04 JP JP8818590A patent/JP2591686B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012148933A (en) * | 2011-01-20 | 2012-08-09 | Sumitomo Osaka Cement Co Ltd | Cement composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2591686B2 (en) | 1997-03-19 |
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