JP2007045654A - Method of producing rapid hardening concrete - Google Patents
Method of producing rapid hardening concrete Download PDFInfo
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- JP2007045654A JP2007045654A JP2005230649A JP2005230649A JP2007045654A JP 2007045654 A JP2007045654 A JP 2007045654A JP 2005230649 A JP2005230649 A JP 2005230649A JP 2005230649 A JP2005230649 A JP 2005230649A JP 2007045654 A JP2007045654 A JP 2007045654A
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- 239000004567 concrete Substances 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 54
- 239000013078 crystal Substances 0.000 claims abstract description 25
- 238000006703 hydration reaction Methods 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 14
- 239000002253 acid Substances 0.000 claims abstract description 12
- 238000010276 construction Methods 0.000 claims abstract description 10
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims abstract description 7
- 229910052808 lithium carbonate Inorganic materials 0.000 claims abstract description 7
- 150000003839 salts Chemical class 0.000 claims abstract description 6
- 239000002344 surface layer Substances 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 7
- 239000011121 hardwood Substances 0.000 claims description 4
- 230000036571 hydration Effects 0.000 claims description 4
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 239000002585 base Substances 0.000 description 36
- 239000004568 cement Substances 0.000 description 19
- 239000000378 calcium silicate Substances 0.000 description 15
- 229910052918 calcium silicate Inorganic materials 0.000 description 15
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 230000000694 effects Effects 0.000 description 7
- 229910052602 gypsum Inorganic materials 0.000 description 6
- 239000010440 gypsum Substances 0.000 description 6
- 239000004570 mortar (masonry) Substances 0.000 description 6
- 229910052936 alkali metal sulfate Inorganic materials 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- -1 calcium aluminates Chemical class 0.000 description 3
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- KWMLJOLKUYYJFJ-UHFFFAOYSA-N 2,3,4,5,6,7-Hexahydroxyheptanoic acid Chemical compound OCC(O)C(O)C(O)C(O)C(O)C(O)=O KWMLJOLKUYYJFJ-UHFFFAOYSA-N 0.000 description 1
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000174 gluconic acid Substances 0.000 description 1
- 235000012208 gluconic acid Nutrition 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Landscapes
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
本発明は、モルタルやコンクリートに速硬材を混合して速硬コンクリートや速硬モルタルを製造する方法において、充分な可使時間を確保でき、かつ短時間の強度発現に優れた速硬コンクリートないし速硬モルタルを製造する方法に関する。より詳しくは、補修工事、緊急工事や一般工事の工期短縮、ならびに作業性改善による施工品質の向上を図るためなどに使用する速硬コンクリート等について、充分な可使時間を確保できるので施工が容易であると共に短時間の強度発現に優れた速硬コンクリート等の製造方法に関する。 The present invention relates to a method for producing fast-curing concrete or fast-curing mortar by mixing fast-hardening material with mortar or concrete, which can ensure sufficient pot life and is capable of securing a short-time strength. The present invention relates to a method for producing fast-setting mortar. More specifically, it is easy to construct because it can secure sufficient pot life for fast-hardening concrete, etc. used for repair work, shortening the work period of emergency work and general work, and improving work quality by improving workability. In addition, the present invention relates to a method for producing fast-hardening concrete and the like excellent in strength development in a short time.
従来、コンクリートやモルタルのようなセメント組成物の硬化促進方法として、カルシウムアルミネート類を主成分とする混和材を添加し、速硬化を図る方法がある。また、このような速硬セメント組成物の可使時間を確保するために、オキシカルボン酸類を主成分とする遅延剤の使用が提案されている。例えば、特許文献１、２には急結成分のカルシウムアルミネートとして１２ＣａＯ・７Ａｌ2Ｏ3（Ｃ12Ａ7と略記する）が例示されており、凝結遅延剤として有機カルボン酸や炭酸カルシウムや水酸化カルシウムなどが例示されている。
しかしながら、カルシウムアルミネート類を主成分とする混和材を添加した場合、オキシカルボン酸類を主成分とする遅延剤を使用しても、数分〜３０分程度の可使時間は確保できるが、１時間以上の長時間の可使時間確保は困難であった。可使時間確保のために、オキシカルボン酸類の量を増やすと、短時間強度が低下する。また、カルシウムアルミネート量を減らすと、可使時間確保は容易となるが、短時間強度が大幅に低下すると云う問題がある。 However, when an admixture mainly composed of calcium aluminates is added, a pot life of several minutes to 30 minutes can be secured even if a retarder mainly composed of oxycarboxylic acids is used. It was difficult to secure a longer pot life than the time. If the amount of oxycarboxylic acids is increased in order to secure the pot life, the strength decreases for a short time. Further, if the amount of calcium aluminate is reduced, it is easy to secure the pot life, but there is a problem that the strength for a short time is greatly reduced.
本発明は、従来の速硬コンクリートにおける上記問題を解決したものであり、短時間強度を低下させることなく、長時間の可使時間確保を可能とした、速硬コンクリートの製造方法を提供する。なお、本発明において、説明の都合上、珪酸カルシウムを主成分とするセメントクリンカ粉砕物を含有するセメントを珪酸カルシウム系セメントと云い、この珪酸カルシウム系セメントを用いたモルタルまたはコンクリートを単にコンクリートと云う。また、凝結遅延剤および速硬材を添加するモルタルまたはコンクリートをベースコンクリートと云う。 This invention solves the said problem in the conventional fast-hardening concrete, and provides the manufacturing method of fast-hardening concrete which enabled ensuring long pot life, without reducing a short-time intensity | strength. In the present invention, for convenience of explanation, a cement containing a pulverized cement clinker mainly composed of calcium silicate is referred to as calcium silicate cement, and mortar or concrete using the calcium silicate cement is simply referred to as concrete. . In addition, mortar or concrete to which a setting retarder and quick-hardening material are added is referred to as base concrete.
本発明は以下の速硬コンクリートの製造方法に関する。
（１）オキシカルボン酸またはその塩と炭酸リチウムよりなる凝結遅延剤をベースコンクリートの練混ぜ時または練混ぜ直後に添加し、この練混ぜたベースコンクリートにＣａＯ・Ａｌ2Ｏ3結晶を主成分とする速硬材を施工時に添加することを特徴とする速硬コンクリートの製造方法。
（２）ＣａＯ・Ａｌ2Ｏ3結晶を主成分とする粉末状速硬材をスラリー状にしてベースコンクリートに添加する上記(1)に記載の速硬コンクリートの製造方法。
（３）ＣａＯ・Ａｌ2Ｏ3結晶を主成分とする粉末状速硬材の粒子表層に予め水和反応相を形成した後にベースコンクリートに添加する上記(1)または(2)に記載する速硬コンクリートの製造方法。
（４）温度２０〜３０℃において、１〜３時間の可使時間を保ち、２０Ｎ/mm2以上の材齢１２時間強度を有するコンクリートを製造する上記(1)〜(3)の何れかに記載する速硬コンクリートの製造方法。
The present invention relates to the following method for producing fast-curing concrete.
(1) A setting retarder composed of oxycarboxylic acid or a salt thereof and lithium carbonate is added during or immediately after mixing the base concrete, and CaO.Al 2 O 3 crystals as the main components are added to the mixed base concrete. A method for producing fast-curing concrete, characterized in that a fast-hardening material to be added is added during construction.
(2) The method for producing fast-curing concrete as described in (1) above, wherein a powdery fast-hardening material mainly composed of CaO · Al 2 O 3 crystals is added to the base concrete in the form of a slurry.
(3) The speed described in (1) or (2) above, which is added to the base concrete after a hydration reaction phase has been formed in advance on the particle surface layer of a powdered fast hardwood mainly composed of CaO · Al 2 O 3 crystals. A method for producing hard concrete.
(4) Any one of the above (1) to (3) for producing a concrete having a strength of 12 hours at an age of 20 N / mm 2 or more at a temperature of 20 to 30 ° C., maintaining a pot life of 1 to 3 hours. The manufacturing method of the quick-hardening concrete to describe.
〔具体的な説明〕
本発明は、オキシカルボン酸またはその塩と炭酸リチウムよりなる凝結遅延剤をベースコンクリートの練混ぜ時または練混ぜ直後に添加し、この練混ぜたベースコンクリートにＣａＯ・Ａｌ2Ｏ3（ＣＡと略記する）結晶を主成分とする速硬材を施工時に添加することを特徴とする速硬コンクリートの製造方法である。
[Specific description]
In the present invention, a setting retarder composed of oxycarboxylic acid or a salt thereof and lithium carbonate is added at the time of or just after mixing the base concrete, and CaO.Al 2 O 3 (abbreviated as CA) is added to the mixed base concrete. This is a method for producing fast-hardening concrete, characterized in that a fast-hardening material mainly composed of crystals is added during construction.
本発明において用いる凝結遅延剤はオキシカルボン酸類と炭酸リチウムを併用したものである。両者を併用することによって、珪酸カルシウム系セメントの凝結遅延効果に優れ、充分な可使時間の確保が容易であり、しかも比較的高い添加率で使用しても速硬コンクリートの短時間強度の発現を阻害せず、むしろ短時間強度を高める効果を有する。因みに、オキシカルボン酸類と従来の炭酸カルシウム等をそれぞれ単独に使用しても本発明と同等の効果は得られない。なお、本発明において可使時間とは、通常のコンリートポンプで圧送可能な時間をいう。 The setting retarder used in the present invention is a combination of oxycarboxylic acids and lithium carbonate. By using both in combination, the calcium silicate-based cement is excellent in setting delay effect, it is easy to secure sufficient pot life, and even if it is used at a relatively high addition rate, the short-time strength of fast-hardening concrete is exhibited. Rather, it has the effect of increasing strength for a short time. Incidentally, even if oxycarboxylic acids and conventional calcium carbonate are used individually, the same effects as those of the present invention cannot be obtained. In the present invention, the pot life refers to the time that can be pumped by a normal concrete pump.
上記凝結遅延剤をベースコンクリートの練混ぜ時または練混ぜ直後に添加する。この凝結遅延剤の作用によってベースコンクリート中の珪酸カルシウム系セメントの水和反応が遅延し、ベースコンクリートについて非常に長時間の可使時間を確保することができる。また、ベースコンクリートの練置き時間や運搬時間が変化しても、ＣＡ結晶を主成分とする速硬材を添加したときに、安定な可使時間、および安定な短時間強度を確保することができる。 The setting retarder is added at the time of mixing the base concrete or immediately after mixing. The action of the setting retarder delays the hydration reaction of the calcium silicate cement in the base concrete, so that a very long pot life can be secured for the base concrete. In addition, even if the base concrete kneading time and transport time are changed, it is possible to secure a stable pot life and a stable short-time strength when adding a quick hardwood mainly composed of CA crystals. it can.
上記凝結遅延剤のオキシカルボン酸またはその塩としては、酒石酸、クエン酸、リンゴ酸、グルコン酸、ヘプトン酸、またはこれらの塩等から選ばれる１種または２種以上を好適に使用することができる。凝結遅延剤の使用量は、ベースコンクリートの珪酸カルシウム系セメントに対して、オキシカルボン酸が０.５〜１.０wt％、炭酸リチウムが０.５〜２.０wt％になる量が適当である。 As the setting retarder oxycarboxylic acid or a salt thereof, one or more selected from tartaric acid, citric acid, malic acid, gluconic acid, heptonic acid, and salts thereof can be suitably used. . Appropriate amounts of setting retarders are 0.5 to 1.0 wt% of oxycarboxylic acid and 0.5 to 2.0 wt% of lithium carbonate based on the calcium silicate cement of the base concrete. .
上記凝結遅延剤において、オキシカルボン酸と併用するものは炭酸リチウムが好ましく、他の炭酸塩、例えば、炭酸ナトリウム等は充分な効果が得られない。 Among the above-mentioned setting retarders, lithium carbonate is preferably used in combination with oxycarboxylic acid, and other carbonates such as sodium carbonate cannot provide sufficient effects.
上記凝結遅延剤を添加したベースコンクリートに速硬材を施工時に添加する。この速硬材はＣＡ結晶を主成分としたものである。速硬材として、例えば、Ｃ12Ａ7結晶、３ＣａＯ・Ａｌ2Ｏ3（Ｃ3Ａと略記する）結晶、ガラス質のカルシウムアルミネートを主成分としたものが従来から知られているが、これらのカルシウムアルミネートは反応性が高く、充分な可使時間を確保するのが難しい。また、２ＣａＯ・Ａｌ2Ｏ3（ＣＡ2と略記する）結晶を主成分とした速硬材は、可使時間を確保するのは容易であるが、短時間強度を確保するのが難しい。 A fast-hardening material is added to the base concrete to which the setting retarder is added at the time of construction. This quick-hardening material is mainly composed of CA crystals. As a fast-hardening material, for example, C 12 A 7 crystal, 3CaO · Al 2 O 3 (abbreviated as C 3 A) crystal, and a material mainly composed of glassy calcium aluminate are conventionally known. These calcium aluminates are highly reactive and it is difficult to ensure sufficient pot life. In addition, a quick-hard material mainly composed of 2CaO.Al 2 O 3 (abbreviated as CA 2 ) is easy to secure the pot life, but it is difficult to ensure the strength for a short time.
速硬材の使用量は、珪酸カルシウム系セメント４０〜９０wt％に対して速硬材６０〜１０wt％が好ましく、セメント７０〜９０wt％に対して速硬材３０〜１０wt％がさらに好ましい。 The amount of the fast-hardening material is preferably 60 to 10 wt% of the fast-hardening material with respect to 40 to 90 wt% of the calcium silicate cement, and more preferably 30 to 10 wt% of the quick-hardening material with respect to 70 to 90 wt% of the cement.
ＣＡ結晶を主成分とする上記速硬材は、練混ぜたベースコンクリートに施工時に添加して用いる。好ましくは、注水練混ぜによってベースコンクリート中の珪酸カルシウム系セメント粒子表面に少量の水和物被膜が形成された後に上記速硬材を添加するのが良い。概ね注水後１０分以上経過すれば珪酸カルシウム系セメント粒子表面に水和物被膜が形成される。この水和物被膜の存在によって珪酸カルシウム系セメントとＣＡとの反応が一時的に遅延され、充分な可使時間を確保することができる。一方、珪酸カルシウム系セメントとＣＡとが反応した後は凝結反応が速やかに進行するので短時間でコンクリート強度が向上し、短時間強度の高い速硬コンクリートを得ることができる。 The above-mentioned fast-hardening material mainly composed of CA crystals is added to the mixed base concrete at the time of construction. Preferably, the quick-hardening material is added after a small amount of hydrate film is formed on the surface of the calcium silicate cement particles in the base concrete by pouring water mixing. In general, a hydrate film is formed on the surface of the calcium silicate-based cement particles when 10 minutes or more have passed after water injection. The presence of this hydrate film temporarily delays the reaction between the calcium silicate cement and CA, and ensures a sufficient pot life. On the other hand, after the calcium silicate cement and CA have reacted, the setting reaction proceeds rapidly, so that the concrete strength is improved in a short time, and a fast-hardened concrete with high strength in a short time can be obtained.
上記速硬材は、粉末状態でベースコンクリートに添加しても良いが、粉末状の速硬材をスラリー状にし、または粉末状速硬材の粒子表層に予め水和反応相を形成した後に、ベースコンクリートに添加するのが好ましい。 The fast hard material may be added to the base concrete in a powder state, but after making the powder fast hard material into a slurry state, or after previously forming a hydration reaction phase on the particle surface layer of the powder fast hard material, It is preferable to add to the base concrete.
速硬材をスラリー状にしてベースコンクリートに添加することによって、ＣＡ結晶とベースコンクリート中の遅延剤成分や珪酸カルシウム系セメント粒子とが均一に混合し易くなり、可使時間の確保および短時間強度の発現が良好になる。ＣＡ結晶とベースコンクリート中の遅延剤成分と珪酸カルシウム系セメント粒子の混合が不均一であると、局所的に遅延剤の作用が薄れた場合に、そこから急激な水和促進が始まり、この部分に遅延剤が消費されて水中の遅延剤濃度が薄くなり、速硬コンクリート全体に水和促進が伝播し、充分な可使時間を確保するのが難しくなる。均一な混合がなされれば、この水和促進反応が生じ難くなるため、充分な可使時間を確保しやすくなる。 By adding the quick-hardening material in the form of a slurry to the base concrete, it becomes easy to uniformly mix the CA crystal with the retarder component and calcium silicate cement particles in the base concrete, ensuring the pot life and short-time strength. Expression is improved. If the mixing of the retarder component in the CA crystal and the base concrete and the calcium silicate cement particles is not uniform, when the action of the retarder is locally diminished, rapid acceleration of hydration starts from this part. When the retarder is consumed, the concentration of the retarder in the water is reduced, and the promotion of hydration propagates throughout the fast-hardened concrete, making it difficult to ensure sufficient pot life. If uniform mixing is performed, this hydration promotion reaction is unlikely to occur, so that a sufficient pot life can be easily secured.
速硬材に水を加えてスラリー状にする場合、粉末状速硬材１００重量部に対する水の添加量は２５〜６０重量部が好ましい。水の添加量が６０重量部を上回ると、速硬コンクリートの水量が増えて強度が低下する虞がある。また、水の添加量が２５重量部未満では充分な流動性が得られず、またはスラリー状にならないので好ましくない。 When water is added to the quick-hardening material to form a slurry, the amount of water added to 100 parts by weight of the powdered quick-hardening material is preferably 25 to 60 parts by weight. If the amount of water added exceeds 60 parts by weight, the amount of fast-cured concrete may increase and the strength may decrease. Further, if the amount of water added is less than 25 parts by weight, it is not preferable because sufficient fluidity cannot be obtained or the slurry is not formed.
また、ＣＡ結晶を主成分とする粉末状速硬材の粒子表層に水和反応相（水和物被膜）を形成した後にベースコンクリートに添加すると、この水和物被膜の存在によって、ＣＡ結晶粒子と珪酸カルシウム系セメントとの反応が一時的に遅延され、より長い可使時間を得ることができる。一方、珪酸カルシウム系セメントとＣＡとが反応した後は凝結反応が速やかに進行するので短時間でコンクリート強度が向上し、短時間強度の高い速硬コンクリートを得ることができる。 Further, when a hydration reaction phase (hydrate coating) is formed on the surface layer of powdered fast hardwood mainly composed of CA crystals and then added to the base concrete, the presence of this hydrate coating causes the CA crystal particles And the calcium silicate cement are temporarily delayed, and a longer pot life can be obtained. On the other hand, after the calcium silicate cement and CA have reacted, the setting reaction proceeds rapidly, so that the concrete strength is improved in a short time, and a fast-hardened concrete with high strength in a short time can be obtained.
速硬材のＣＡ結晶粒子表面に水和反応相を形成するには、粉末状速硬材１００重量部に対して、０.２〜５.０重量部の水を添加するのが好ましく、０.５〜１.０重量部がより好ましい。水の添加量が０.２重量部未満では水和反応相が不充分であるため可使時間をより長める効果が充分でない虞があり、５.０重量部を上回るとＣＡ結晶と水の水和反応率が高くなり過ぎて、未水和のＣＡ結晶の量が減少し、短時間強度が低下する虞がある。ＣＡ結晶の大部分を水和反応物とすることは短時間強度を発現させるうえで好ましくなく、ＣＡ結晶粒子の表層だけを水和反応相で覆うことが好ましい。 In order to form a hydration reaction phase on the surface of the CA crystal particles of the quick-hardening material, it is preferable to add 0.2 to 5.0 parts by weight of water with respect to 100 parts by weight of the powdery quick-hardening material. 0.5 to 1.0 parts by weight are more preferable. If the amount of water added is less than 0.2 parts by weight, the hydration reaction phase is insufficient, so that the effect of extending the pot life may not be sufficient. There is a possibility that the hydration reaction rate becomes too high, the amount of unhydrated CA crystals decreases, and the strength decreases for a short time. It is not preferable to make most of the CA crystal a hydrated reaction product in order to develop strength for a short time, and it is preferable to cover only the surface layer of the CA crystal particle with the hydration reaction phase.
粉末状の速硬材に少量の水を添加して粒子表面に水和反応相を形成する際、慣用の粉体用ミキサー等を用いて速硬材を混合しながら水を添加し、２４時間以上静置して、充分に水和反応を進行させるのが好ましい。なお、粉体用ミキサー等を用いて速硬材を充分に混合しないと、局所的にＣＡ結晶粒子どうしが凝集し、ベースコンクリートとの混合性を阻害する虞があるので好ましくない。 When a small amount of water is added to the powdered fast-hardening material to form a hydration reaction phase on the particle surface, water is added while mixing the fast-hardening material using a conventional powder mixer, etc. for 24 hours. It is preferable that the hydration reaction is allowed to proceed sufficiently by allowing to stand as described above. In addition, it is not preferable that the quick-hardening material is not sufficiently mixed using a powder mixer or the like because the CA crystal particles are locally aggregated and the mixing property with the base concrete may be hindered.
粉末状の速硬材に少量の水を添加してＣＡ結晶粒子表面に水和物被膜を形成しておき、さらに施工時に、この速硬材に水を混合してスラリー状にしてベースコンクリートに添加するのが最も好ましい。水和物被膜の形成とスラリー化との両手段を併用することによってさらに長い可使時間を確保することができる。 A small amount of water is added to the powdered fast-hardening material to form a hydrate film on the surface of the CA crystal particles, and at the time of construction, water is added to the fast-hardening material to form a slurry to form the base concrete. Most preferably, it is added. A longer pot life can be secured by using both means of forming a hydrate film and slurrying.
本発明の速硬コンクリートの製造方法によれば、コンクリートの短時間強度を低下させることなく、従来以上の長い可使時間を確保することができる。例えば、外気温２０℃〜３０℃の夏季においても、１時間〜３時間の可使時間を確保することができ、材齢１２時間で２０Ｎ/mm2以上の短時間強度を安定的に確保することができる。なお、本発明において材齢とはベースコンクリートに速硬材を添加してからの時間をいい、強度とは特に断らない限り圧縮強度を意味する。 According to the method for producing fast-curing concrete of the present invention, a longer pot life than conventional can be secured without reducing the short-time strength of the concrete. For example, even in the summer when the outside air temperature is 20 ° C. to 30 ° C., a pot life of 1 hour to 3 hours can be secured, and a short-term strength of 20 N / mm 2 or more can be stably secured at a material age of 12 hours. be able to. In the present invention, the age refers to the time after adding the fast-hardening material to the base concrete, and the strength means the compressive strength unless otherwise specified.
本発明の製造方法は、ベースコンクリートに凝結遅延剤を添加し、施工時に速硬材を加えるので、例えば、予め生コン工場で製造したベースコンクリートを施工現場のミキサーに搬送し、これに速硬材を混合して使用することができ、ベースコンクリートの搬送時間を充分に確保することができる。また、ベースコンクリートに速硬材を混合した後に充分な可使時間を得ることができるので、ベースコンクリートと速硬材を充分に混合した後に施工することができ、また充分な施工時間を確保できるため、高品質の速硬コンクリートを得ることができる。 In the manufacturing method of the present invention, a setting retarder is added to the base concrete, and a fast-hardening material is added at the time of construction. For example, the base concrete manufactured in advance in a ready-mixed factory is transported to a mixer on the construction site, The base concrete can be used in a mixed manner, and a sufficient transport time for the base concrete can be secured. In addition, since a sufficient pot life can be obtained after mixing fast-hardening material with the base concrete, it can be applied after sufficiently mixing the base concrete and the quick-hardening material, and sufficient construction time can be secured. Therefore, high-quality fast-hardening concrete can be obtained.
本発明の製造方法において、上記作用効果を損なわない範囲で、石膏やアルカリ金属硫酸塩等の硫酸塩、膨脹材、収縮低減剤、防錆剤、防水材、各種の繊維、各種の減水剤などの混和材料を必要に応じてベースコンクリート、速硬材および／または速硬コンクリートに添加することができる。例えば、ベースコンクリート、速硬材、速硬コンクリートの何れかに石膏を添加することによって、可使時間に殆ど影響することなく、速硬コンクリートの材齢１２時間強度が３０Ｎ/mm2以上となるので好ましい。また、ベースコンクリート、速硬材、速硬コンクリートの何れかに、石膏とアルカリ金属硫酸塩を併用して添加することによって、可使時間に殆ど影響することなく、速硬コンクリートの材齢１２時間強度が４０Ｎ/mm2以上となるのでより好ましい。なお、スラリー状の速硬材に硫酸塩が含まれていると速硬材自体が硬化し易くなる虞があるので、石膏やアルカリ金属硫酸塩等の硫酸塩を添加する場合は、ベースコンクリートの練混ぜ時または練混ぜ直後に添加することが好ましい。石膏を添加する場合、ＣＡ結晶を主成分とする速硬材１００重量部に対し、５０〜１５０重量部が好ましい。また、アルカリ金属硫酸塩を添加する場合、ＣＡ結晶を主成分とする速硬材１００重量部に対し、３〜１５重量部が好ましい。 In the production method of the present invention, sulfate, such as gypsum and alkali metal sulfate, expansion material, shrinkage reducing agent, rust preventive agent, waterproofing material, various fibers, various water reducing agents, etc. These admixtures can be added to the base concrete, fast-hardening material and / or fast-hardening concrete as required. For example, by adding gypsum to base concrete, fast-hardening material, or fast-hardening concrete, the strength of fast-hardening concrete will be 30 N / mm 2 or more with almost no effect on pot life. Therefore, it is preferable. Addition of gypsum and alkali metal sulfate to base concrete, fast-hardening material, or fast-hardening concrete in combination adds 12 hours to the age of fast-hardening concrete with almost no effect on pot life. It is more preferable because the strength is 40 N / mm 2 or more. Note that if the slurry-like fast-hardening material contains sulfate, the fast-hardening material itself may be hardened. Therefore, when adding a sulfate such as gypsum or alkali metal sulfate, It is preferable to add at the time of kneading or immediately after kneading. When adding gypsum, 50-150 weight part is preferable with respect to 100 weight part of quick-hardening materials which have a CA crystal as a main component. Moreover, when adding an alkali metal sulfate, 3-15 weight part is preferable with respect to 100 weight part of quick-hardening materials which have CA crystal as a main component.
以下、本発明の実施例を比較例と共に示す。各例において、ベースコンクリートは表１に示す材料を用い、表２に示す重量比で配合したものである。 Examples of the present invention are shown below together with comparative examples. In each example, the base concrete is prepared by using the materials shown in Table 1 at a weight ratio shown in Table 2.
〔実施例および比較例〕
表２に示すベースコンクリートの練混ぜ時に、表３または表４に示す組成（表中の％は重量％を意味する）の凝結遅延剤を添加し、コンクリートミキサーによって練混ぜ、さらに練混ぜ１５分経過後に、表３または表４に示す速硬材を添加してコンクリートミキサーで混合し、速硬材混合後の可使時間、６時間〜１２時間の材齢強度を測定した。この結果を表３および表４に示した。また、使用した速硬材を表５に示した。なお、可使時間および材齢強度は以下の方法で測定した。
[Examples and Comparative Examples]
At the time of mixing the base concrete shown in Table 2, a setting retarder having the composition shown in Table 3 or 4 (% in the table means% by weight) is added, mixed by a concrete mixer, and further mixed for 15 minutes. After the elapse of time, the quick-hardening materials shown in Table 3 or Table 4 were added and mixed with a concrete mixer, and the pot life after mixing the quick-hardening materials and the age strength of 6 to 12 hours were measured. The results are shown in Tables 3 and 4. In addition, Table 5 shows the fast-hardening materials used. The pot life and age strength were measured by the following methods.
〔可使時間〕
スクイズ式コンクリートポンプを用いて作製した速硬コンクリートを循環し、圧送時の圧力が用いたコンクリートポンプの最大理論吐出圧力の８０％以上となった時点までの、速硬コンクリート作製からの時間を可使時間とした。試験温度は、試料Ｎｏ．６及びＮｏ．７のみ３０℃、その他は２０℃とした。
〔圧縮強度〕
日本工業規格のJIS A 1108-1999「コンクリートの圧縮強度試験方法」に従い測定した。試料作製時の温度および養生温度は、試料No.６およびNo.７のみ３０℃、その他は２０℃とした。
[Pot life]
Circulation of fast-hardening concrete produced using a squeeze-type concrete pump allows time from the production of fast-hardening concrete until the point when the pressure during pumping reaches 80% or more of the maximum theoretical discharge pressure of the concrete pump. It was time to use. The test temperature is the sample No. 6 and no. Only 7 was set to 30 ° C, and the others were set to 20 ° C.
[Compressive strength]
Measured according to Japanese Industrial Standard JIS A 1108-1999 “Testing method for compressive strength of concrete”. The temperature at the time of sample preparation and the curing temperature were set to 30 ° C. only for samples No. 6 and No. 7, and 20 ° C. for others.
本実施例の試料（No.１〜No.７）は何れも可使時間が１時間以上であり、材齢１２時間強度が３０Ｎ/mm2以上であった。特に、ベースコンクリートに石膏とアルカリ金属硫酸塩を添加した試料No.２〜No.７の材齢１２時間強度は４０Ｎ/mm2以上であった。
一方、表３に示す比較試料No.11〜No.14は遅延剤の成分が本発明と異なり、また比較試料No.15〜No.17は速硬材の成分が本発明と異なるので、充分な可使時間と高い材齢１２時間強度を両立できない。
In all of the samples (No. 1 to No. 7) of this example, the pot life was 1 hour or more, and the strength at the age of 12 hours was 30 N / mm 2 or more. In particular, samples No. 2 to No. 7 in which gypsum and alkali metal sulfate were added to the base concrete had a strength of 40 N / mm 2 or more at an age of 12 hours.
On the other hand, comparative samples No. 11 to No. 14 shown in Table 3 are different from the present invention in the retarder components, and comparative samples No. 15 to No. 17 are different from the present invention in the components of the quick-hardening material. It is impossible to achieve both a pot life and a high age of 12 hours.
Claims (4)
A setting retarder composed of oxycarboxylic acid or a salt thereof and lithium carbonate is added at the time of mixing the base concrete or immediately after mixing, and the hardened base mainly composed of CaO · Al 2 O 3 crystals is added to the mixed base concrete. A method for producing fast-hardening concrete, characterized in that a material is added during construction.
Method for producing a rapid-concrete of claim 1, wherein the powdery rapid setting material composed mainly of CaO · Al 2 O 3 crystals in the slurry is added to the base concrete.
Method for producing a rapid-concrete according to claim 1 or 2 is added to the base concrete after preformed hydration phase CaO · Al 2 O 3 crystal particle surface layer of the powdered fast hardwood mainly.
The fast-curing concrete according to any one of claims 1 to 3, wherein a concrete having a strength of 12 hours at an age of 20 N / mm 2 or more is produced at a temperature of 20 to 30 ° C, maintaining a pot life of 1 to 3 hours. Production method.
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| WO2020039908A1 (en) * | 2018-08-22 | 2020-02-27 | デンカ株式会社 | Hardening agent for ready-mix shipped rapid-hardening concrete, ready-mix shipped rapid-hardening concrete material, ready-mix shipped rapid-hardening concrete composition, and method for preparing same |
| WO2022092081A1 (en) * | 2020-10-30 | 2022-05-05 | デンカ株式会社 | Two material-type ready-mix shipped rapid-hardening concrete material and ready-mix shipped rapid-hardening concrete composition |
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| JP2015182259A (en) * | 2014-03-20 | 2015-10-22 | 太平洋マテリアル株式会社 | Manufacturing method of specified cement kneaded material |
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| WO2018154890A1 (en) | 2017-02-22 | 2018-08-30 | デンカ株式会社 | Hardening agent for ready-mix shipped rapid-hardening concrete, ready-mix shipped rapid-hardening concrete material, ready-mix shipped rapid-hardening concrete composition, and method for preparing same |
| JPWO2018154890A1 (en) * | 2017-02-22 | 2019-12-19 | デンカ株式会社 | Hardener for ready-mixed concrete shipping-type hardened concrete, ready-mixed concrete shipping-type quick-hardened concrete material, ready-mixed concrete shipping-type rapid-hardened concrete composition, and method for preparing the same |
| WO2020039908A1 (en) * | 2018-08-22 | 2020-02-27 | デンカ株式会社 | Hardening agent for ready-mix shipped rapid-hardening concrete, ready-mix shipped rapid-hardening concrete material, ready-mix shipped rapid-hardening concrete composition, and method for preparing same |
| CN112601726A (en) * | 2018-08-22 | 2021-04-02 | 电化株式会社 | Hardening agent for quick-hardening concrete delivered in ready-mixed concrete mode, quick-hardening concrete material delivered in ready-mixed concrete mode, quick-hardening concrete composition delivered in ready-mixed concrete mode and preparation method thereof |
| JPWO2020039908A1 (en) * | 2018-08-22 | 2021-08-10 | デンカ株式会社 | Hardener for ready-mixed concrete shipping type hard concrete, ready-mixed concrete shipping type hard concrete material, ready-mixed concrete shipping type hard concrete composition and its preparation method |
| JP7319984B2 (en) | 2018-08-22 | 2023-08-02 | デンカ株式会社 | Hardening agent for ready-mixed concrete shipment-type rapid-hardening concrete, ready-mixed concrete shipment-type rapid-hardening concrete material, ready-mixed concrete shipment-type rapid-hardening concrete composition and preparation method thereof |
| WO2022092081A1 (en) * | 2020-10-30 | 2022-05-05 | デンカ株式会社 | Two material-type ready-mix shipped rapid-hardening concrete material and ready-mix shipped rapid-hardening concrete composition |
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