JP2017159532A - Manufacturing method of anti-freezing damage concrete - Google Patents
Manufacturing method of anti-freezing damage concrete Download PDFInfo
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- JP2017159532A JP2017159532A JP2016045405A JP2016045405A JP2017159532A JP 2017159532 A JP2017159532 A JP 2017159532A JP 2016045405 A JP2016045405 A JP 2016045405A JP 2016045405 A JP2016045405 A JP 2016045405A JP 2017159532 A JP2017159532 A JP 2017159532A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000007710 freezing Methods 0.000 title abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 11
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims abstract description 4
- 239000005033 polyvinylidene chloride Substances 0.000 claims abstract description 4
- 239000011347 resin Substances 0.000 claims abstract description 4
- 229920005989 resin Polymers 0.000 claims abstract description 4
- 239000004005 microsphere Substances 0.000 claims description 28
- 238000004898 kneading Methods 0.000 abstract description 5
- 239000004568 cement Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 239000006185 dispersion Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 3
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 239000003981 vehicle Substances 0.000 description 3
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- -1 acrylic ester Chemical class 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000013065 commercial product Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 150000004676 glycans Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920001282 polysaccharide Polymers 0.000 description 2
- 239000005017 polysaccharide Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- JHPBZFOKBAGZBL-UHFFFAOYSA-N (3-hydroxy-2,2,4-trimethylpentyl) 2-methylprop-2-enoate Chemical compound CC(C)C(O)C(C)(C)COC(=O)C(C)=C JHPBZFOKBAGZBL-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- GYCMBHHDWRMZGG-UHFFFAOYSA-N Methylacrylonitrile Chemical compound CC(=C)C#N GYCMBHHDWRMZGG-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000005215 alkyl ethers Chemical class 0.000 description 1
- 235000010980 cellulose Nutrition 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 239000006072 paste Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 150000008442 polyphenolic compounds Chemical class 0.000 description 1
- 235000013824 polyphenols Nutrition 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
Abstract
Description
本発明は、凍害対策コンクリートの製造方法に関する。 The present invention relates to a method for producing anti-frost damage concrete.
コンクリートに凍結融解抵抗性を付与するには、所定の大きさの空気をコンクリートに一定量含ませることが有効である。
通常、ＡＥ剤と呼ばれる空気連行剤によってコンクリート中に微細な気泡が導入されるが、コンクリート配合の相違、スランプの大小、練り混ぜ時間、ミキサ形式、温度、骨材の種類や量などによって、導入される空気量が変動する。また、コンクリートをアジテータ車で運搬する過程においても、連行された空気が抜け、打設現場に到着した時点で目標の空気量を確保できていない場合もある。
そのため、凍結融解抵抗性を付与する材料として、コンクリート練り混ぜ時に中空微小球を混和することが知られている（特許文献１、２、３）。
また、投入の手間や設備を要することなく、簡易かつ安全に材料を投入する方法として水溶紙に封入して材料を投入する方法が知られている（特許文献４、５、６）。
In order to impart freeze-thaw resistance to concrete, it is effective to include a certain amount of air of a predetermined size in the concrete.
Normally, fine air bubbles are introduced into the concrete by an air entrainment agent called AE agent, but it is introduced depending on the difference in concrete composition, slump size, mixing time, mixer type, temperature, type and amount of aggregate, etc. The amount of air that is produced fluctuates. Also, even in the process of transporting concrete with an agitator vehicle, the entrained air may escape and the target air amount may not be secured when it arrives at the placement site.
For this reason, it is known that hollow microspheres are mixed as a material imparting freeze-thaw resistance when mixing concrete (Patent Documents 1, 2, and 3).
In addition, as a method for simply and safely loading a material without requiring labor and facilities for loading, there is known a method for loading a material by enclosing it in water-soluble paper (Patent Documents 4, 5, and 6).
中空微小球は密度が小さく飛散するため、コンクリートに混和する際に発塵し、発塵抑制を目的とした排気装置に吸引され、コンクリート中に所定量混和することが難しい。
また、あらかじめ練り混ぜたコンクリートへ後から中空微小球を添加する場合においても、投入に時間がかかるため、コンクリート中に所定量を正確に混和することや均一に分散させることが難しく、コンクリートの練り混ぜ時間を長く確保する必要があった。
本発明は、中空微小球を封入した水溶紙の袋を特定のタイミングでコンクリートに投入することにより、簡易、かつ、安全に、所定量の中空微小球をコンクリートに混和でき、しかも投入時間を短縮できる凍害対策コンクリートの製造方法を提供する。
Since the hollow microspheres are small in density and scattered, they generate dust when mixed with concrete, and are sucked into an exhaust device for the purpose of suppressing dust generation, and it is difficult to mix a predetermined amount in the concrete.
In addition, even when hollow microspheres are added later to concrete that has been kneaded in advance, it takes time to charge, so it is difficult to accurately mix or uniformly disperse a predetermined amount in the concrete. It was necessary to ensure a long mixing time.
The present invention allows a predetermined amount of hollow microspheres to be mixed with concrete easily and safely by inserting a water-soluble paper bag enclosing hollow microspheres into concrete at a specific timing, and shortens the charging time. A method for producing frost damage-resistant concrete is provided.
本発明は、上記課題を解決するために以下の手段を採用する。
（１）中空微小球を封入した袋体を、あらかじめ練混ぜたコンクリートに後添加し、さらに練り混ぜる凍害対策コンクリートの製造方法である。
（２）前記袋体が水溶紙からなる凍害対策コンクリートの製造方法である。
（３）前記水溶紙の木材パルプ含有率が75〜95％である（２）の凍害対策コンクリートの製造方法である。
（４）前記中空微小球が、ポリ塩化ビニリデン樹脂からなる（１）〜（３）のうちの１つの凍害対策コンクリートの製造方法である。
The present invention employs the following means in order to solve the above problems.
(1) A method for producing anti-frost damage concrete in which a bag body in which hollow microspheres are enclosed is added to concrete that has been previously mixed and further mixed.
(2) A method for producing anti-frost damage concrete in which the bag is made of water-soluble paper.
(3) The method for producing anti-frost damage concrete according to (2), wherein the wood pulp content of the water-soluble paper is 75 to 95%.
(4) The method according to one of (1) to (3), wherein the hollow microsphere is made of polyvinylidene chloride resin.
本発明によって、中空微小球を、簡易、かつ、安全に、所定量をコンクリート中に混和でき、しかも投入時間を短縮して凍害対策コンクリートを製造できるという効果を奏する。 According to the present invention, it is possible to easily and safely mix a predetermined amount of hollow microspheres into concrete, and to produce frost damage-preventing concrete by reducing the charging time.
以下、本発明を詳細に説明する。
なお、本発明で使用する部や％は特に規定のない限り質量基準である。
また、本発明のコンクリートとは、セメントペースト、セメントモルタル、及びセメントコンクリートを総称するものである。
Hereinafter, the present invention will be described in detail.
The parts and% used in the present invention are based on mass unless otherwise specified.
The concrete of the present invention is a general term for cement paste, cement mortar, and cement concrete.
本発明で使用する中空微小球とは、粒子中に内包された空洞を有するもので、有機系や無機系のものが存在するが、本発明では弾性的な性質を有する有機系を用いることが好ましい。
有機系の中空微小球の材質としては、アクリロニトリル、アクリル酸エステル、メタクリル酸エステル、フェノール、ポリメチルメタクリレート、メタクリロニトリル、ポリスチレン、塩化ビニリデン、酢酸ビニル、及びポリフェノールなどがあり、共重合物や架橋体であっても特に限定されるものではない。なかでも、アクリロニトリル、塩化ビニリデンをベースとした共重合体が好ましい。
中空微小球の径は、凍結融解等の耐久性の面から、300μｍ以下が好ましく、100μｍ以下がより好ましい。
The hollow microspheres used in the present invention have cavities encapsulated in particles, and there are organic and inorganic types. In the present invention, an organic type having elastic properties is used. preferable.
Materials for organic hollow microspheres include acrylonitrile, acrylic ester, methacrylic ester, phenol, polymethyl methacrylate, methacrylonitrile, polystyrene, vinylidene chloride, vinyl acetate, and polyphenol. Even if it is a body, it is not specifically limited. Of these, copolymers based on acrylonitrile and vinylidene chloride are preferred.
The diameter of the hollow microsphere is preferably 300 μm or less, and more preferably 100 μm or less, from the viewpoint of durability such as freezing and thawing.
本発明では、中空微小球を袋体に封入して、あらかじめ練り混ぜたコンクリートに後添加する。
本発明で使用する袋体は、ミキサなどで、容易に破壊し、封入した中空微小球が、あらかじめ練り混ぜたコンクリートに均一に分散するのであれば特に限定されるものではないが、簡易、かつ、安全に、所定量をコンクリート中に混和でき、しかも投入時間を短縮できる面から、水溶紙の袋体を使用することが好ましい。
In the present invention, hollow microspheres are encapsulated in a bag and added later to concrete that has been kneaded in advance.
The bag used in the present invention is not particularly limited as long as it is easily broken with a mixer or the like, and the encapsulated hollow microspheres are uniformly dispersed in the concrete kneaded in advance. It is preferable to use a water-soluble paper bag from the viewpoint that a predetermined amount can be safely mixed with concrete and the charging time can be shortened.
本発明における中空微粒子の使用量は、凍結融解抵抗性の改善の面や圧縮強度などの物理特性低下防止の面から、コンクリート100容量部中、0.1〜10容量部が好ましく、0.5〜５容量部がより好ましい。 The amount of the hollow fine particles used in the present invention is preferably from 0.1 to 10 parts by volume, preferably from 0.5 to 5 parts by volume in 100 parts by volume of concrete, from the viewpoint of improving freeze-thaw resistance and preventing physical properties such as compressive strength from being lowered. Is more preferable.
本発明で使用する水溶紙は、木材パルプ、多糖類、セルロース、ポリビニルアルコール（ポバール）、カルボキシメチルセルロース、及びでんぷんなどを原料とするもので、原料中の木材パルプの含有量は75〜95％が好ましく、80〜90％がより好ましい。木材パルプを除く多糖類、ポバール、セルロース、カルボキシメチルセルロース、及びでんぷんなどの原料は、水溶紙の製造の面や、コンクリート中に巻き込む空気量を抑える面から、５〜25％が好ましく、10〜20％がより好ましい。 The water-soluble paper used in the present invention is made from wood pulp, polysaccharides, cellulose, polyvinyl alcohol (Poval), carboxymethyl cellulose, starch, etc., and the content of wood pulp in the raw material is 75 to 95%. Preferably, 80 to 90% is more preferable. The raw materials such as polysaccharides excluding wood pulp, poval, cellulose, carboxymethylcellulose, and starch are preferably 5 to 25% from the viewpoint of manufacturing water-soluble paper and reducing the amount of air engulfed in the concrete. % Is more preferable.
また、水溶紙は、水溶性であれば特に限定されるものではないが、20℃の水500mlが入ったビーカー(容量1,000ml)に水溶紙を10ｇ添加し、例えば、池田理工社製のスターラーにより800rpmで攪拌した時の分散時間が、分散性の面から、30秒以下であることが好ましく、20秒以下がより好ましい。分散時間は目視により凝集物がなくなった状態の時を言う。 Water-soluble paper is not particularly limited as long as it is water-soluble, but 10 g of water-soluble paper is added to a beaker (capacity 1,000 ml) containing water at 20 ° C., for example, a stirrer manufactured by Ikeda Riko Co., Ltd. From the viewpoint of dispersibility, the dispersion time when stirring at 800 rpm is preferably 30 seconds or less, and more preferably 20 seconds or less. Dispersion time refers to the time when no agglomerates are visible.
本発明では、中空微小球が封入された袋体を、あらかじめ練り混ぜたコンクリートに後添加する。
中空微小球は、あらかじめ練り混ぜたコンクリートに後添加する際、こぼれることがなければ、袋体に、どのように入っているか特に限定されるものではないが、中空微小球は密度が小さく飛散するため、本発明では、袋体に封入する。
In the present invention, the bag body in which the hollow microspheres are enclosed is added to the concrete kneaded in advance.
When hollow microspheres are not spilled when added to concrete that has been kneaded in advance, there is no particular limitation on how the microspheres are contained in the bag body, but the hollow microspheres are scattered with low density. Therefore, in this invention, it encloses in a bag.
本発明で使用する袋体は、中空微小球が、あらかじめ練り混ぜたコンクリートに後添加できるものであれば特に限定されるものではないが、分散するまでの時間を短くし、分散性を上げるために、水溶紙を、例えば、圧着シールして作成した袋体を使用することが好ましい。 The bag used in the present invention is not particularly limited as long as the hollow microspheres can be added later to the concrete kneaded in advance, but in order to shorten the time until dispersion and increase dispersibility. In addition, it is preferable to use a bag made of water-soluble paper by, for example, pressure sealing.
本発明で使用する水溶紙の寸法は、分散するまでの時間を短くし、分散性を上げる面から、縦15〜35cmが好ましく、20〜30cmがより好ましい。横は、25〜45cmが好ましく、30〜40cmがより好ましい。幅は、５〜20cmが好ましく、10〜15cmがより好ましい。
作業性や分散性の面から、水溶紙の坪量は、30〜120g/m2、厚さは、50〜200μｍが好ましい。
The dimension of the water-soluble paper used in the present invention is preferably 15 to 35 cm in length and more preferably 20 to 30 cm from the viewpoint of shortening the time until dispersion and improving dispersibility. The width is preferably 25 to 45 cm, more preferably 30 to 40 cm. The width is preferably 5 to 20 cm, more preferably 10 to 15 cm.
From the viewpoint of workability and dispersibility, the basis weight of the water-soluble paper is preferably 30 to 120 g / m 2 and the thickness is preferably 50 to 200 μm.
本発明における水溶紙の袋体は、取扱性や作業性の面から、コンクリート100容量部中、中空微小球0.5〜５容量部を水溶紙の袋体に封入した状態で混和し、コンクリート１m3あたり４〜６袋に分けて混和することが好ましい。 Bag of water feed in the present invention is to mix the handleability and workability of the surface, in concrete 100 parts by volume, while encapsulating the hollow microspheres 0.5-5 parts by volume in a bag of water paper, concrete 1 m 3 It is preferable to mix in 4 to 6 bags.
作業性の面から水溶紙の袋体に封入した中空微小球のコンクリートへの添加方法は、コンクリートの運搬と混合を兼ねることができるアジテータ車に後添加することが好ましいが、ミキサーにてコンクリートを練り混ぜ後、ミキサー内に後添加しても良い。アジテータ車に後添加すると、他の投入方法と比較して、分散性が良好である。 From the viewpoint of workability, it is preferable to add the hollow microspheres encapsulated in a water-soluble paper bag to the concrete after the addition to the agitator vehicle that can serve both as transport and mixing of the concrete. After kneading, it may be added later in the mixer. When added to an agitator vehicle later, the dispersibility is better than other methods.
また、あらかじめ練り混ぜたコンクリートに袋体を後添加するまでの時間は特に限定されるものではないが、120分未満が好ましい。 The time until the bag is added to the concrete kneaded in advance is not particularly limited, but is preferably less than 120 minutes.
本発明では、あらかじめ練り混ぜたコンクリートに袋体を添加し、さらに練り混ぜる。
練り混ぜる速度は特に限定されるものではないが、17rpm以上が好ましい。
In the present invention, a bag is added to concrete that has been kneaded in advance, and further kneaded.
The kneading speed is not particularly limited, but is preferably 17 rpm or more.
本発明の水溶紙の袋体を添加したコンクリートの練り混ぜ時間は、袋体の水溶紙が溶解し、袋体に封入されていた中空微粒子が充分に分散性されれば特に限定されるものではないが、45〜75秒が好ましい。
袋体を添加したコンクリートの練り混ぜ時間は、無混和のコンクリートと同程度であるが、本発明の水溶紙を用いた場合、コンクリートの練り混ぜ時間が短くなり、水溶紙がコンクリート中に残存することなく溶解する。
The mixing time of the concrete to which the water-soluble paper bag of the present invention is added is not particularly limited as long as the water-soluble paper of the bag is dissolved and the hollow fine particles enclosed in the bag are sufficiently dispersible. Although 45 to 75 seconds is preferred.
The mixing time of the concrete added with the bag is about the same as that of the non-mixed concrete, but when the water-soluble paper of the present invention is used, the mixing time of the concrete is shortened and the water-soluble paper remains in the concrete. It dissolves without.
本発明のコンクリートに使用されるセメントは、特に限定されるものではなく、普通、早強、超早強、低熱、及び中庸熱などの各種ポルトランドセメント、これらポルトランドセメントに、高炉スラグ、フライアッシュ、シリカ、又は石灰石微粉などを混合した各種混合セメント、並びに、廃棄物利用型セメント、いわゆるエコセメントなどが挙げられる。 The cement used in the concrete of the present invention is not particularly limited, and various portland cements such as ordinary, early strength, ultra-early strength, low heat, and moderate heat, and these portland cements include blast furnace slag, fly ash, Examples thereof include various mixed cements in which silica, limestone fine powder, or the like is mixed, and waste-use type cements, so-called eco cements.
以下、実験例を挙げて本発明をさらに具体的に説明するが、本発明はこれら実験例に限定されるものではない。 EXAMPLES Hereinafter, although an experiment example is given and this invention is demonstrated further more concretely, this invention is not limited to these experiment examples.
実験例１
単位水量（Ｗ）160kg/m3、単位セメント量（Ｃ）355kg/m3、Ｗ／Ｃ＝45.1％、細骨材率ｓ／ａ＝43.6％を基本配合とし、ＡＥ減水剤の添加量を調整しながら、目標スランプを８cm、ＡＥ剤による空気量を4.0％とし、コンクリートを生コンプラントの二軸強制攪拌ミキサ（容量2,000リッター）にて調製した。試験は20±２℃で実施した。注水後の練り混ぜ時間は30秒とした。
その後、アジテータ車に排出し、30分間、10rpmの低速で待機した。
一方、坪量、厚さ、及び寸法が同じで、木材パルプの含有率の異なる水溶紙を使用し、ハリナックスプレス（コクヨ社製）を用いて底と横の３面を圧着シールし、開口部より、中空微小球を投入し、袋体の破袋による中空微小球の飛散を防止するため、開口部を全面ではなく10箇所圧着シールして、袋体を５体作製した。中空微小球の使用量は、練り混ぜたコンクリート100容量部に対して、２容量部である。
作製した袋体を、アジテータ車に後添加し、60秒間、20rpmの高速で、さらに練り混ぜた。その際全量投入するまでの時間も測定した。
また、ミキサーにてコンクリートを練混ぜ後、ミキサー内に後添加して、練り混ぜ速度17rpm、練り混ぜ時間60秒でさらに練り混ぜる方法も実施した。
なお、中空微小球を水溶紙の袋体に封入せずにアジテータ車に後添加した場合や、コンクリート100容量部に対して２容量部に相当する中空微粒子を、セメントや骨材と一緒に混合し、その後注水して一括で練り混ぜる従来の方法を比較として実施した。
練り混ぜ後のコンクリートは型枠に充填して、凍結融解抵抗性試験用の試験体とした。その後、表面をキャッピングし、20℃で１日養生した後、脱型し、28日間20℃水中で養生を行い、凍結融解抵抗性試験を実施した。
Experimental example 1
The basic composition is unit water volume (W) 160kg / m 3 , unit cement volume (C) 355kg / m 3 , W / C = 45.1%, fine aggregate ratio s / a = 43.6%, and the amount of AE water reducing agent added While adjusting, the target slump was 8 cm, the air amount by the AE agent was 4.0%, and the concrete was prepared by a biaxial forced stirring mixer (capacity 2,000 liters) of a raw plant. The test was performed at 20 ± 2 ° C. The mixing time after water injection was 30 seconds.
After that, it was discharged to an agitator car and waited at a low speed of 10 rpm for 30 minutes.
On the other hand, water-soluble papers with the same basis weight, thickness, and dimensions and different wood pulp contents are used, and the bottom and side surfaces are pressure-bonded and sealed using a Halinax press (manufactured by KOKUYO). In order to prevent the hollow microspheres from being scattered due to the bag breakage, ten openings were crimped and sealed not at the entire surface, but five bags were produced. The amount of hollow microspheres used is 2 parts by volume with respect to 100 parts by volume of concrete mixed.
The produced bag was added later to the agitator car and further kneaded at a high speed of 20 rpm for 60 seconds. At that time, the time until the entire amount was charged was also measured.
In addition, after mixing concrete with a mixer, it was further added into the mixer and further mixed at a mixing speed of 17 rpm and a mixing time of 60 seconds.
In addition, when hollow microspheres are added to an agitator car without enclosing them in a water-soluble paper bag, hollow microparticles equivalent to 2 parts by volume are mixed with cement and aggregates for 100 parts by volume of concrete. Then, the conventional method of pouring water and kneading all together was carried out as a comparison.
The concrete after kneading was filled into a mold and used as a specimen for a freeze / thaw resistance test. Thereafter, the surface was capped, cured at 20 ° C. for 1 day, demolded, cured in water at 20 ° C. for 28 days, and a freeze-thaw resistance test was performed.
＜使用材料＞
水 ：水道水
セメント ：普通ポルトランドセメント、市販品、密度3.16g/cm3
中空微小球：ポリ塩化ビニリデン樹脂、平均粒径80μｍ、膜厚0.2μｍ、市販品、密度0.13g/cm3
水溶紙 ：木材パルプの含有率75％（木材パルプ以外はセルロース25％）、85％（木材パルプ以外はポバール15％）、95％（木材パルプ以外はカルボキシメチルセルロース５％）の３種類、坪量、厚さ、及び寸法は３種類とも同じであり、坪量60g/m2、厚さ110μｍ、寸法（縦：25cm、横：30cm、幅：10cm）、分散時間20秒以内、市販品。
細骨材 ：川砂、姫川産、５mm下、密度2.64g/cm3
粗骨材 ：川砂利、姫川産、20mm下、密度2.67g/cm3
ＡＥ減水剤：リグニンスルホン酸化合物・ポリカルボン酸エーテル複合体、市販品
ＡＥ剤 ：アルキルエーテル系、ＢＡＳＦジャパン社製、市販品
<Materials used>
Water: Tap water cement: Ordinary Portland cement, commercially available, density 3.16 g / cm 3
Hollow microsphere: Polyvinylidene chloride resin, average particle size 80μm, film thickness 0.2μm, commercial product, density 0.13g / cm 3
Water-soluble paper: Three types of wood pulp content: 75% (25% cellulose except wood pulp), 85% (15% poval other than wood pulp), 95% (carboxymethylcellulose 5% other than wood pulp), basis weight Thickness and dimensions are the same for all three types, basis weight 60 g / m 2 , thickness 110 μm, dimensions (vertical: 25 cm, horizontal: 30 cm, width: 10 cm), dispersion time within 20 seconds, commercial product.
Fine aggregate: River sand, from Himekawa, 5mm below, density 2.64g / cm 3
Coarse aggregate: River gravel, from Himekawa, 20mm below, density 2.67g / cm 3
AE water reducing agent: lignin sulfonic acid compound / polycarboxylic acid ether complex, commercially available AE agent: alkyl ether, commercially available from BASF Japan
＜測定方法、評価方法＞
分散時間 ：20℃の水500mlが入ったビーカー(容量1,000ml)に水溶紙などの試料を10ｇ添加し、池田理工社製スターラーにより800rpmで攪拌した時に目視により凝集物がなくなった状態までの時間。
凍結融解抵抗性：ＪＩＳ Ａ １１４８「コンクリ−トの凍結融解試験方法」Ａ法に準拠し、凍結融解試験300サイクル終了時において、相対的動弾性係数を測定した。
<Measurement method, evaluation method>
Dispersion time: Time until agglomerates disappeared when 10 g of a sample such as water-soluble paper was added to a beaker (capacity 1,000 ml) containing 20 ml of water at 20 ° C and stirred at 800 rpm with a stirrer manufactured by Ikeda Riko Co., Ltd. .
Freeze-thaw resistance: Based on JIS A 1148 “Method of freeze-thaw test of concrete” A, the relative dynamic elastic modulus was measured at the end of 300 cycles of the freeze-thaw test.
表１から、中空微小球をコンクリートに混和することにより相対動弾性係数の低下を低減できることが分かる。
本発明の製造方法により従来の添加方法よりも相対動弾性係数の低下を低減でき、水溶紙に封入せず添加した場合と比較して作業性が向上したことが分かる。
From Table 1, it can be seen that mixing the hollow microspheres with concrete can reduce the decrease in the relative dynamic elastic modulus.
It can be seen that the production method of the present invention can reduce the decrease in the relative dynamic elastic modulus as compared with the conventional addition method, and the workability is improved as compared with the case where the addition is performed without encapsulating in water-soluble paper.
本発明によって、中空微小球を簡易かつ安全に所定量をコンクリート中に混和でき、しかも投入時間を短縮して凍害対策コンクリートを製造できるため、土木、建築分野に好適である。 According to the present invention, a predetermined amount of hollow microspheres can be easily and safely mixed in concrete, and the frost damage countermeasure concrete can be manufactured by reducing the charging time, which is suitable for the civil engineering and construction fields.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020151972A (en) * | 2019-03-20 | 2020-09-24 | 太平洋セメント株式会社 | Method for producing fiber-reinforced concrete |
| CN112118943A (en) * | 2018-06-18 | 2020-12-22 | 电化株式会社 | Method for feeding hardening accelerator for concrete surface finishing |
| JP7337674B2 (en) | 2019-12-03 | 2023-09-04 | デンカ株式会社 | Method for manufacturing cement material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112118943A (en) * | 2018-06-18 | 2020-12-22 | 电化株式会社 | Method for feeding hardening accelerator for concrete surface finishing |
| EP3778164A4 (en) * | 2018-06-18 | 2022-01-12 | Denka Company Limited | Method for feeding hardening accelerator for concrete surface finish |
| JP2020151972A (en) * | 2019-03-20 | 2020-09-24 | 太平洋セメント株式会社 | Method for producing fiber-reinforced concrete |
| JP7337674B2 (en) | 2019-12-03 | 2023-09-04 | デンカ株式会社 | Method for manufacturing cement material |
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