JP4249643B2 - Method for preventing consolidation of silica fume - Google Patents
Method for preventing consolidation of silica fume Download PDFInfo
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- JP4249643B2 JP4249643B2 JP2004079426A JP2004079426A JP4249643B2 JP 4249643 B2 JP4249643 B2 JP 4249643B2 JP 2004079426 A JP2004079426 A JP 2004079426A JP 2004079426 A JP2004079426 A JP 2004079426A JP 4249643 B2 JP4249643 B2 JP 4249643B2
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- 229910021487 silica fume Inorganic materials 0.000 title claims description 30
- 238000007596 consolidation process Methods 0.000 title claims description 20
- 238000000034 method Methods 0.000 title claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 229920001281 polyalkylene Polymers 0.000 claims description 10
- 238000005056 compaction Methods 0.000 claims description 8
- 229920001451 polypropylene glycol Polymers 0.000 claims description 7
- 238000007711 solidification Methods 0.000 claims description 7
- 230000008023 solidification Effects 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 239000002202 Polyethylene glycol Substances 0.000 claims description 5
- 229920001223 polyethylene glycol Polymers 0.000 claims description 5
- 230000002265 prevention Effects 0.000 claims description 4
- 229920001515 polyalkylene glycol Polymers 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 description 16
- 230000000694 effects Effects 0.000 description 13
- 239000004570 mortar (masonry) Substances 0.000 description 9
- 239000004568 cement Substances 0.000 description 7
- 239000003638 chemical reducing agent Substances 0.000 description 6
- 239000006227 byproduct Substances 0.000 description 4
- 239000010881 fly ash Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000005469 granulation Methods 0.000 description 3
- 230000003179 granulation Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000008235 industrial water Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 101001026137 Cavia porcellus Glutathione S-transferase A Proteins 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 101001026109 Gallus gallus Glutathione S-transferase Proteins 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 235000014366 other mixer Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 polybutylene Polymers 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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
- 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
- Silicon Compounds (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
本発明は、シリカフュームの圧密固化防止方法に関し、詳しくは、シリカフュームにポリアルキレングリコールを配合して、混合粉砕することによって、袋やフレコンなどに詰めた場合の、シリカフュームの圧密固化を防止し、嵩密度を大きくして取り扱いやすくする方法に関する。 The present invention relates to a compaction anticaking method silica fume, details, by blending polyalkylene ring recall the silica fume, by mixing pulverized into prevented when packed like a bag or a flexible container, a compaction solidification of silica fume, The present invention relates to a method for increasing the bulk density to facilitate handling.
シリカフュームはセメント混和材として多用されているが、粒子が極めて細かく嵩密度が小さいために、産地から消費地への運搬や輸送が非合理的である。また、静電気を帯びやすいために、袋やフレコンに詰め、それを段積みすると圧密して固化する。さらに、シリカフュームと、石膏、炭カル、フライアッシュ、高炉スラグ、粘土鉱物、及び膨張材等、セメント混和材として使用される他の成分とを配合してセメント混和材を製造する場合でも、製品として出荷するために、袋やフレコンに詰めると圧密固化する場合がある等々の課題があった。 Silica fume is widely used as a cement admixture. However, since the particles are extremely fine and the bulk density is small, transportation and transportation from the production area to the consumption area is unreasonable. In addition, since it is easy to be charged with static electricity, it is packed into bags and flexible containers and stacked and solidified. Furthermore, even when cement admixtures are manufactured by blending silica fume with other components used as cement admixtures, such as gypsum, charcoal cal, fly ash, blast furnace slag, clay minerals, and expansion materials, In order to ship, there are problems such as compaction and solidification when packed in bags and flexible containers.
運搬や輸送が非合理的であるという課題に関しては、静電造粒などにより造粒して嵩密度を大きくする方法が一般化し、産地からの輸送については改善されているが、そのままセメント混和材としてコンクリートに添加した場合は、分散性が低下するという課題が新たに発生している。 Regarding the problem of unreasonable transportation and transportation, the method of increasing the bulk density by granulating by electrostatic granulation has been generalized, and transportation from the production area has been improved, but as it is as a cement admixture When added to concrete, there is a new problem that the dispersibility decreases.
また、圧密して固化するという課題に対しては、シリカフュームの特性を把握した専用のサイロを設計・製作して対応したり、適当な濃度で水に分散させてスラリー化する方法が提案されている。
しかしながら、シリカフュームは嵩密度が小さいために、専用サイロは大型化しなければならないことと、全ての生コン工場に経済的に専用サイロを設置することは困難であり、スラリー化は水を運搬することにもなるので不経済となるばかりでなく、攪拌を止めると固化するという課題がある。
Also, for the problem of consolidation and solidification, special silos that understand the characteristics of silica fume can be designed and manufactured, or a method of slurrying by dispersing in water at an appropriate concentration has been proposed. Yes.
However, since silica fume has a low bulk density, it is difficult to install a dedicated silo in a large scale, and it is difficult to economically install a dedicated silo in all ready-mixed factories. This is not only uneconomical but also solidifies when stirring is stopped.
一方、ポリアルキレングリコールは、木材の防腐剤として使用されたり(特許文献１参照)、セメント・コンクリートの世界ではポリアルキレングリコールの一つであるポリプロピレングリコールの低分子量(100〜800)のものは収縮低減剤として提案されたり、高分子量(1,000以上)のものは高性能減水剤のスランプロス低減に用いることも提案されている(特許文献２参照)が、シリカフュームの圧密固化防止や嵩密度を大きくする作用効果については知られていないし、そのための方法も提案されていない。 On the other hand, polyalkylene ring recall is (see Patent Document 1) or is used as a preservative for wood, low molecular weight polypropylene glycol which is one of polyalkylene ring recall the world of cement-concrete (100-800) that or it is proposed as shrinkage reducing agents, high molecular weight (1,000 or more) of even the have also been proposed for use in the slump loss reducing superplasticizers (see Patent Document 2), compaction anticaking or bulk silica fume The effect of increasing the density is not known, and a method for that purpose has not been proposed.
本発明者は、シリカフュームに、ポリアルキレングリコールを添加して、又は、シリカフュームに、ポリアルキレングリコールと水を添加して、一緒に粉砕することによって圧密固化を防止することが可能であることを知見し本発明を完成するに至った。 The present invention shall, silica fume that, by adding polyalkylene ring recall, or, silica fume, with the addition of polyalkylene ring recall and water, it is possible to prevent the consolidation solidified by milling together As a result, the present invention has been completed.
本発明が解決しようとする課題は、シリカフュームの圧密固化を防止すると共に、嵩密度を造粒しないで大きくして取り扱いやすくする方法を提供するものである。 The problem to be solved by the present invention is to provide a method for preventing the consolidation of silica fume and increasing the bulk density without granulation for easy handling.
本発明は、シリカフュームとポリアルキレングリコールとを配合し、混合粉砕するシリカフュームの圧密固化防止方法であり、前記ポリアルキレングリコールが、シリカフューム100部に対して、0.1〜10部である前記シリカフュームの圧密固化防止方法であり、さらに、水を配合する前記シリカフュームの圧密固化防止方法であり、前記ポリアルキレングリコールが、ポリエチレングリコール又はポリプロピレングリコールである前記シリカフュームの圧密固化防止方法であり、前記水が、シリカフューム100部に対して、10部以下である前記シリカフュームの圧密固化防止方法である。 The present invention is blended with silica fume and polyalkylene ring recall a compaction anticaking method silica fume to mixing and grinding, the polyalkylene ring recall is, relative to 100 parts silica fume, the silica fume is 0.1 to 10 parts It is a consolidation solidification prevention method, further is a consolidation consolidation prevention method of the silica fume blended with water, the polyalkylene glycol is a consolidation solidification prevention method of the silica fume which is polyethylene glycol or polypropylene glycol, and the water is against silica fume 100 parts, a compaction anticaking method of the silica fume is less than 10 parts.
本発明方法により、シリカフュームの圧密固化を防止すると共に、嵩密度を大きくし、その取り扱い性を容易にしたり、強度の増大効果を助長するなどの効果を奏する。 According to the method of the present invention, the silica fume is prevented from being consolidated and solidified, and the bulk density is increased, the handleability is facilitated, and the effect of increasing the strength is promoted.
以下、本発明を詳しく説明する。
なお、本発明で使用する部又は％は特に規定のない限り質量基準である。
Hereinafter, the present invention will be described in detail.
The parts or% used in the present invention are based on mass unless otherwise specified.
本発明で使用するシリカフューム(以下、ＳＦという)とは、金属シリコンやフェロシリコンなどのシリコンアロイを電気炉で製造する際に、アーク熱で一度気化したSiO2が煙道で冷却される過程で固化し副生する球形の、直径が１μｍ以下の微粒子で、主成分は非晶質の反応性の高いSiO2であり、副生したＳＦの嵩密度は0.2〜0.4g/cm3と小さく、輸送を合理化するために造粒して消費地へ運搬するのが一般化している。
そして、副生したままのＳＦは嵩密度は小さく、圧密固化しやすく、造粒したＳＦは嵩密度は大きくなり、圧密固化しにくくなるが、粉砕すると圧密固化しやすくなる。
The silica fume (hereinafter referred to as SF) used in the present invention is a process in which SiO 2 once vaporized by arc heat is cooled in a flue when a silicon alloy such as metal silicon or ferrosilicon is produced in an electric furnace. Solid and by-product spherical fine particles with a diameter of 1 μm or less, the main component is amorphous SiO 2 with high reactivity, and the bulk density of by-product SF is as small as 0.2 to 0.4 g / cm 3 , In order to streamline transportation, granulation and transportation to consumption areas are common.
The SF as a by-product has a low bulk density and is easily consolidated and solidified, and the granulated SF has a large bulk density and is difficult to be consolidated. However, when pulverized, it is easily consolidated and solidified.
本発明で使用するポリアルキレングリコール(以下、ＰＡＧという)とは、主に圧密固化防止と嵩密度を大きくする効果があり、造粒して顆粒状となったＳＦに対しても、また、副生したままの嵩密度の小さいＳＦに対しても同様の効果を示すものであり、具体的には、ポリエチレングリコール、ポリプロピレングリコール、及びポリブチレングリコールなどが挙げられ、これらの一種又は二種以上が使用可能である。
ＰＡＧの平均分子量は、100〜6,000の範囲に入るが、分子量が大きいものは固形化するものもあるので、使用可能なものは粘性が高くても液体の状態のものである。
ＰＡＧ使用量は、その効果と経済性の面から、ＳＦ100部に対して、0.1〜10部が好ましく、0.3〜８部がより好ましく、0.5〜５部が最も好ましい。0.1部未満では圧密防止効果や嵩密度を大きくする効果は小さく、10部を超えて使用しても圧密防止効果や嵩密度を大きくする効果は変わらないし、ＰＡＧと粉砕費用の価格でＳＦの価格が高くなるので経済的に好ましくない。
Polyalkylene ing recalls for use in the present invention (hereinafter, PAG hereinafter) and is mainly has the effect of increasing compaction anticaking and the bulk density, even for SF was granulated to granules, also, It shows the same effect on SF with a small bulk density as a by-product, and specific examples thereof include polyethylene glycol, polypropylene glycol, and polybutylene glycol. Can be used.
The average molecular weight of PAG falls within the range of 100 to 6,000, but some having a large molecular weight solidify, so that what can be used is in a liquid state even if the viscosity is high.
The amount of PAG used is preferably from 0.1 to 10 parts, more preferably from 0.3 to 8 parts, and most preferably from 0.5 to 5 parts, based on 100 parts of SF, from the standpoint of the effect and economy. If it is less than 0.1 part, the anti-consolidation effect and the effect of increasing the bulk density are small, and even if it exceeds 10 parts, the effect of anti-consolidation and the effect of increasing the bulk density will not change, and the price of SF at the price of PAG and grinding cost Is not economically preferable.
さらに、本発明では、水をＰＡＧと併用して、一緒に混合粉砕することが好ましい。
ＳＦに水を単独で、例えば、10部も添加するとそれだけで粉砕機の中で既に圧密固化して粉砕することもできないが、本発明のようにＰＡＧと一緒に混合粉砕すると圧密固化しないし、モルタルやコンクリートに添加したときの分散性はむしろよくなるために、フローやスランプは大きくなり、強度も増大する。
水の使用量は、ＳＦ100部に対して、10部以下が好ましく、８部以下がより好ましく、２〜６部が最も好ましい。水を10部を超えて使用しても、それ以上のスランプアップや強度の増大効果は頭打ちとなるので好ましくない。
Furthermore, in the present invention, it is preferable to use water together with the PAG and mix and pulverize them together.
When water alone is added to SF, for example, 10 parts alone, it cannot be solidified and pulverized in a pulverizer alone, but when mixed and pulverized together with PAG as in the present invention, it does not become solidified. Dispersibility when added to mortar or concrete is rather improved, so flow and slump increase and strength also increases.
The amount of water used is preferably 10 parts or less, more preferably 8 parts or less, and most preferably 2 to 6 parts relative to 100 parts of SF. Even if the water is used in excess of 10 parts, the effect of further slumping up and increasing the strength will reach the peak, which is not preferable.
なお、水の中に、セメント分散剤、界面活性剤、並びに、促進剤や遅延剤、その他セメントに使用される混和剤である各種水溶性の塩類を溶解した水溶液を併用することは、コンクリートにＳＦを使用したときの分散性をより良くしたり、少量の混和剤を均一に嵩密度の小さいＳＦの中に分散させることが可能であるのでより好ましい。 It should be noted that it is not possible to use concrete in water with an aqueous solution in which various water-soluble salts, which are admixtures used in cement, such as cement dispersants, surfactants, accelerators and retarders, are used. It is more preferable because the dispersibility when using SF can be improved and a small amount of an admixture can be uniformly dispersed in SF having a small bulk density.
本発明において、まず、ＳＦとＰＡＧ、又は、ＳＦ、ＰＡＧ、及び水を混合するが、混合には、ナウターミキサやＶブレンダー、その他の混合機の使用が可能である。
また、粉砕機は振動ミルやボールミルなどの磨砕形式の粉砕機も剪断破壊粉砕形式の粉砕機も、いずれも使用可能である。また、粉砕条件は常法でよく、特に制限されない。
In the present invention, SF and PAG, or SF, PAG, and water are first mixed. For mixing, a Nauter mixer, a V blender, and other mixers can be used.
As the pulverizer, either a grinding type pulverizer such as a vibration mill or a ball mill or a shear breaking pulverizing type pulverizer can be used. The pulverization conditions may be conventional methods and are not particularly limited.
この際、例えば、ＳＦをベルトコンベアーで定量フィードしながら薬注ポンプなどでＰＡＧやＰＡＧと水をＳＦの上に定量的に滴下し、そのままミルにフィードする方法が煩雑でなく最も好ましい。 At this time, for example, a method in which PAG or PAG and water are quantitatively dropped onto the SF with a chemical injection pump while feeding SF quantitatively with a belt conveyor and fed to the mill as it is is not complicated and is most preferable.
以下、本発明を実施例に基づいて詳細に説明するが、本発明はこれらに限られるものではない。 EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not limited to these.
実験例１
造粒したＳＦ類αを床に広げ、ＳＦ100部に対して、表１に示すＰＡＧを添加し、ナイロン袋で手混合し、二筒式の連続粉砕する小型振動ミルで１kg/１分のフィード量で混合粉砕した。
ＳＦ類αの変わりに、副生したままのＳＦとフライアッシュとの等量混合物であるＳＦ類βを使用して同様に行った。
混合粉砕物の圧密固化の程度を観察し、嵩密度を測定した。結果を表１に併記する。
Experimental example 1
Spread granulated SF acids α on the floor, relative to SF100 parts, was added PAG shown in Table 1, were hand mixed with a nylon bag, the two cylinder type of small vibration mill at 1 kg / 1 min feed successive grinding Mixed and ground in the amount.
Instead of SF class alpha, was conducted in the same manner by using the SF compound β is equal mixture of SF and fly ash remain-product.
The degree of consolidation and solidification of the mixed pulverized product was observed, and the bulk density was measured. The results are also shown in Table 1.
＜使用材料＞
ＳＦ類α ：エルケム社製ＳＦ、粉末を顆粒状にしたもの、嵩密度0.4g/cm3
ＳＦ類β ：ＳＫＷ社製ＳＦ、粉末、嵩密度0.3g/cm3とフライアッシュとの等量混合物
ＰＡＧイ ：ポリプロピレングリコール、平均分子量1,000
ＰＡＧロ ：ポリプロピレングリコール、平均分子量3,000
<Materials used>
SF such alpha: those Erukemu Co. SF, powder was granulated, bulk density 0.4 g / cm 3
SF acids beta: SKW Co. SF, powder, a mixture of equal parts of the bulk density of 0.3 g / cm 3 and fly ash PAG I: Polypropylene glycol, average molecular weight 1,000
PAG B: Polypropylene glycol, average molecular weight 3,000
＜試験方法＞
圧密固化の程度：紙袋に粉砕ＳＦを20kg詰め、それを床の上に置き、板を乗せてその上に25kgセメント袋を10袋乗せて、20℃、湿度80％以上の室内で保管して、１ケ月後、一番下のＳＦの圧密固化の程度を観察
嵩密度 ：1,000ccのガラスのシリンダーに900〜1,000ccのＳＦを入れ、叩いて空気を追い出したときの容積と重量を測定して嵩密度を計算
<Test method>
Degree of consolidation: Pack 20kg of ground SF in a paper bag, place it on the floor, place a plate and place 10 25kg cement bags on it, store it in a room at 20 ℃ and humidity 80% or more. One month later, observe the degree of consolidation of SF at the bottom Bulk density: Measure the volume and weight when 900 to 1,000 cc of SF is put into a 1,000 cc glass cylinder and the air is driven out by striking it. To calculate the bulk density
表１より、ＳＦを粉砕しただけでは固く圧密固化し、嵩密度もそれほど高くならない(実験No.1- 1)が、ＳＦ100部に対して、ＰＡＧを0.1部添加することにより圧密固化する程度は緩和され、ＰＡＧを0.3部添加することにより圧密固化しなくなり、さらに、ＰＡＧの添加量が多くなるほど全く圧密固化しなくなるだけでなく、ＰＡＧの添加量が２部を超えると、ＰＡＧの添加量が増加するほどＳＦの流動性が大きくなり、発塵性も大きくなる。また、添加量の増加に伴って嵩密度も順次大きくなるが、８部を超えると嵩密度は少し低下する傾向が認められる(実験No.1- 2〜実験No.1-10)。
圧密固化や流動性(取り扱い性)の程度や、嵩密度の推移と経済性から、ＰＡＧの添加量は、好ましくは0.3〜８部であり、より好ましくは0.5〜５部と考えられる。
また、ＳＦとフライアッシュの２成分系の混和材を想定し、その中のＳＦ100部に対して、ＰＡＧを添加した場合も同様の効果が示される(実験No.1-12〜実験No.1-19)。
Table 1 shows that SF is solidified and solidified only by pulverizing SF, and the bulk density is not so high (Experiment No. 1-1). However, the degree of consolidation by adding 0.1 part of PAG to 100 parts of SF is The addition of 0.3 part of PAG is alleviated, and not only does the consolidation become solid as the addition amount of PAG increases, but also the addition amount of PAG increases when the addition amount of PAG exceeds 2 parts. As it increases, the fluidity of SF increases and the dust generation also increases. In addition, the bulk density gradually increases with the addition amount, but when it exceeds 8 parts, the bulk density tends to decrease slightly (Experiment No. 1-2 to Experiment No. 1-10 ).
The amount of PAG added is preferably 0.3 to 8 parts, more preferably 0.5 to 5 parts, from the degree of consolidation and fluidity (handleability), the transition of bulk density and economy.
In addition, assuming a two-component admixture of SF and fly ash, the same effect is shown when PAG is added to 100 parts of SF (Experiment No. 1-12 to Experiment No. 1). -19 ).
実験例２
ＳＦ類βに、ＳＦ類β中のＳＦ100部に対して、表２に示すＰＡＧと水を添加したこと以外は実験例１と同様に行った。結果を表２に併記する。
Experimental example 2
The SF class beta, relative SF100 parts in SF class beta, except that the addition of PAG and water shown in Table 2 was conducted in the same manner as in Experimental Example 1. The results are also shown in Table 2.
＜使用材料＞
高性能ＡＥ減水剤：ポリカルボン酸塩系高性能ＡＥ減水剤、市販品
ＰＡＧハ ：ポリエチレングリコール、平均分子量400
水ａ ：工業用水
水ｂ ：工業用水に高性能ＡＥ減水剤を内割り10％溶解した水溶液
<Materials used>
High-performance AE water-reducing agent: polycarboxylate-based high-performance AE water-reducing agent, commercially available PAG C: polyethylene glycol, average molecular weight 400
Water a: Industrial water b: Aqueous solution containing 10% of high-performance AE water reducing agent dissolved in industrial water
表２より、ＰＡＧと水を添加した場合は圧密固化はしないが発塵性は抑えられる(実験No.2- 1〜実験No.2-12)。 From Table 2, the case of adding PAG and water are not compacted solidified dust generation is suppressed (Experiment No. 2-1 ~ Experiment No. 2-12).
実験例３
実験例１の実験No.1-11、実験No.1-16と実験No.1-17、及び実験No.2- 1〜実験No.2-12の混和材を用いてモルタル試験を行い、モルタルフローと圧縮強度を測定した。
モルタル配合は普通ポルトランドセメント100部に対して、前記混和材10部、細骨材150部、水30部、及び実験例２で使用した高性能ＡＥ減水剤1.0部を練り混ぜ、モルタルフローと圧縮強度を測定した。結果を表３に併記する。
Experimental example 3
Performed Mortar tests using experimental example 1 experiment No. 1-11, experimental No.1-16 and experimental Nanba1-17, and admixture of Experiments No. 2-1 ~ experiment No. 2-12, Mortar flow and compressive strength were measured.
For mortar formulation, 100 parts of normal Portland cement are mixed with 10 parts of the above-mentioned admixture, 150 parts of fine aggregate, 30 parts of water, and 1.0 part of the high-performance AE water reducing agent used in Experimental Example 2, and mortar flow and compression The strength was measured. The results are also shown in Table 3.
＜測定方法＞
モルタルフロー：ＪＩＳ Ｒ 5201に準じて測定
圧縮強度 ：φ５×10cmの供試体を成形し、４時間、前養生してから、20℃から80℃まで３時間で上げて、そのまま５時間保持してから蒸気を止めて、養生槽の中で翌日まで徐々に冷却して脱型し、材齢１日の圧縮強度を測定
<Measurement method>
Mortar flow: Measured according to JIS R 5201 Compressive strength: φ5 × 10cm specimen was molded, pre-cured for 4 hours, then raised from 20 ° C to 80 ° C over 3 hours, and held there for 5 hours Stop steam and cool down gradually until the next day in the curing tank and remove the mold.
表３より、ＰＡＧの単独添加はモルタルフローの向上は影響を与えないが、圧縮強度は増加する(実験No.3- 1〜実験No.3- 3)。また、水や高性能ＡＥ減水剤を溶解した水溶液と併用添加することによりモルタルフローと圧縮強度の増大効果が示される。
水の添加量は多くなるほどモルタルフローも圧縮強度も順次高くなるが、10部を超えて添加しても、それ以上のモルタルフローの向上や強度の増大効果は頭打ちとなる。８部以下が好ましく、２〜６部がより好ましい(実験No.3- 4〜実験No.3-10)。
また、ＰＡＧの種類ではポリエチレングリコールの圧縮強度の増加は小さく、ポリプロピレングリコールが最も大きい(実験No.3-12、実験No.3-15)。
From Table 3, sole addition of PAG does not affect improvement in Morutarufuro over, compressive strength increases (Experiment No. 3- 1 ~ Experiment No. 3- 3). Moreover, the combined effect with the aqueous solution which melt | dissolved water and the high performance AE water reducing agent shows the increase effect of mortar flow and compressive strength.
As the amount of water added increases, the mortar flow and the compressive strength gradually increase. However, even if the amount added exceeds 10 parts, the effect of further improving the mortar flow and increasing the strength reaches its peak. The amount is preferably 8 parts or less, more preferably 2 to 6 parts (Experiment No. 3-4 to Experiment No. 3-10 ).
Further, in the type of PAG, the increase in compressive strength of polyethylene glycol is small, and polypropylene glycol is the largest (Experiment No. 3-12, Experiment No. 3-15) .
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