JP6185682B1 - Blast furnace slag fine powder and cement composition - Google Patents
Blast furnace slag fine powder and cement composition Download PDFInfo
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- 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
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- 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
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Abstract
【課題】従来にない物性を備え、強度発現性が良好でありながら、流動性にも優れ、硬化体の収縮の少ない微粉末度の高い高炉スラグ微粉末およびそれを用いたセメント系組成物の提供。【解決手段】高炉スラグ微粉末として、累積体積率５０％の粒子径が１．０〜５．０μｍであり、かつ全細孔容積が０．０２ｃｍ３／ｇ以下である高炉スラグ微粉末。さらに好ましくは、高炉スラグ微粉末累積個数５０％の円形度が０．９５０以上である高炉スラグ微粉末。【選択図】なしA blast furnace slag fine powder having a high degree of fineness and a cementitious composition using the same, which has unprecedented physical properties, good strength development, excellent fluidity and little shrinkage of a cured product. Provided. As a blast furnace slag fine powder, a blast furnace slag fine powder having a cumulative volume fraction of 50% and a particle diameter of 1.0 to 5.0 μm and a total pore volume of 0.02 cm 3 / g or less. More preferably, blast furnace slag fine powder having a circularity of 0.950 or more when the cumulative number of fine blast furnace slag powder is 50%. [Selection figure] None
Description
本発明は、コンクリート用混和材などとして用いられる高炉スラグ微粉末および高炉スラグ微粉末を混合したセメント組成物に関するものである。 The present invention relates to a blast furnace slag fine powder used as an admixture for concrete and a cement composition in which blast furnace slag fine powder is mixed.
JIS A6206：2013では、高炉スラグ微粉末を、比表面積によって、高炉スラグ微粉末3000、高炉スラグ微粉末4000、高炉スラグ微粉末6000、高炉スラグ微粉末8000の４種類に分けている。 According to JIS A6206: 2013, blast furnace slag fine powder is divided into four types of blast furnace slag fine powder 3000, blast furnace slag fine powder 4000, blast furnace slag fine powder 6000, and blast furnace slag fine powder 8000 according to specific surface area.
従来、高炉スラグ微粉末6000よりも細かい高炉スラグ微粉末を製造する場合、一般的には4000程度まで粉砕した後に、分級をして細かい高炉スラグ微粉末を製造している。この場合、より細かい高炉スラグ微粉末を製造するほど、製品の割合が少なくなり収率が悪くなる。 Conventionally, when producing a blast furnace slag fine powder finer than the blast furnace slag fine powder 6000, the powder is generally classified to about 4000 and then classified to produce a fine blast furnace slag fine powder. In this case, as the finer blast furnace slag fine powder is produced, the product ratio decreases and the yield deteriorates.
また、従来のJISに基づく市販の高炉スラグ微粉末では、ブレーン比表面積の大きい高炉スラグ微粉末を用いた場合に強度発現が良好となる。しかし、高炉スラグ微粉末は細かいほど同一フローを得るための高性能ＡＥ減水剤の添加量が多く流動性に課題がある。また、一般に、比表面積の大きい細かい高炉スラグ微粉末ほど硬化体の収縮が大きくなるとされている。 Moreover, in the conventional blast furnace slag fine powder based on JIS, strength development becomes favorable when the blast furnace slag fine powder having a large Blaine specific surface area is used. However, the finer the blast furnace slag fine powder, the larger the amount of the high-performance AE water reducing agent for obtaining the same flow, the more the flowability is problematic. In general, the finer blast furnace slag fine powder having a larger specific surface area is said to have a larger shrinkage of the cured body.
このように、セメントに対する混和材としての高炉スラグ微粉末については、一般的にブレーン比表面積を基準としての性能評価がなされているが、ブレーン比表面積だけでは必ずしも高炉スラグ微粉末の粉末度や物性を正確に把握することはできず、的確な指標となっているかについては疑問があった（非特許文献１）。 As described above, performance of blast furnace slag fine powder as an admixture for cement is generally evaluated based on the specific surface area of Blaine. Cannot be accurately grasped, and there was a question as to whether it is an accurate index (Non-patent Document 1).
高炉スラグ微粉末の利用に関しては、多数の出願があり、例えば特許文献１には、セメントと、ブレーン比表面積が６０００ｃｍ２／ｇを超えた高炉スラグ微粉末と、膨張材と、軽量骨材などを含む高流動軽量モルタル組成物が記載されている。 Regarding the use of blast furnace slag fine powder, there are many applications. For example, Patent Document 1 discloses cement, blast furnace slag fine powder having a Blaine specific surface area exceeding 6000 cm 2 / g, an expansion material, a lightweight aggregate, and the like. A high flow lightweight mortar composition is described.
また、特許文献２には、高強度のセメント組成物の構成材料としての無機粉末の選択肢の一つとしてＢＥＴ比表面積が５〜２５ｍ２／ｇであるスラグ微粉末が記載されている。 Patent Document 2 describes slag fine powder having a BET specific surface area of 5 to 25 m 2 / g as one of the options of inorganic powder as a constituent material of a high-strength cement composition.
前述のように、従来のJISに基づく市販の高炉スラグ微粉末では、ブレーン比表面積が大きいほど強度発現が良好となる反面、流動性と硬化体の収縮に課題があった。 As described above, in the conventional blast furnace slag fine powder based on JIS, the strength expression is better as the Blaine specific surface area is larger, but there are problems in fluidity and shrinkage of the cured body.
本発明は、このような背景のもとに開発されたものであり、累積体積率と全細孔容積によって評価される従来にない物性を備え、強度発現性が良好でありながら、流動性にも優れ、硬化体の収縮の少ない微粉末度の高い高炉スラグ微粉末およびそれを用いたセメント系組成物を提供することを目的としている。 The present invention was developed based on such a background, has unprecedented physical properties evaluated by the cumulative volume fraction and the total pore volume, has good strength development, and has good fluidity. Another object of the present invention is to provide a ground granulated blast furnace slag with a small degree of shrinkage of a cured product and a high fineness, and a cementitious composition using the same.
本願発明の高炉スラグ微粉末は、粉砕機を用いた複数回の粉砕により、累積体積率５０％の粒子径が１．０〜５．０μｍであり、かつ全細孔容積が０．０２ｃｍ３／ｇ以下となるまで微粉末化してなることを特徴とするものである。
また、本願発明の高炉スラグ微粉末の製造方法は、累積体積率５０％の粒子径が１．０〜５．０μｍであり、かつ全細孔容積が０．０２ｃｍ ３ ／ｇ以下となる高炉スラグ微粉末の製造方法であって、粉砕された高炉スラグ微粉末をさらに粉砕機を用いて１回または複数回粉砕することで、累積体積率５０％の粒子径が１．０〜５．０μｍであり、かつ全細孔容積が０．０２ｃｍ ３ ／ｇ以下に収まるまで微粉末化していくことを特徴とするものである。
The blast furnace slag fine powder of the present invention has a particle diameter of 1.0 to 5.0 μm with a cumulative volume ratio of 50% and a total pore volume of 0.02 cm 3 / It is characterized by being finely powdered until it becomes g or less.
Moreover, the manufacturing method of the blast furnace slag fine powder of this invention is a blast furnace slag in which the particle diameter of 50% of cumulative volume ratio is 1.0-5.0 micrometers, and the total pore volume is 0.02 cm < 3 > / g or less. A method for producing fine powder, wherein the pulverized blast furnace slag fine powder is further pulverized once or a plurality of times by using a pulverizer, so that the particle size with a cumulative volume ratio of 50% is 1.0 to 5.0 μm. It is characterized in that it is finely powdered until the total pore volume falls within 0.02 cm 3 / g.
累積体積率５０％の粒子径が１．０〜５．０μｍの高炉スラグ微粉末は、後述する表１からも明らかなように、従来の一般的な高炉スラグ微粉末8000と比較した場合でも平均粒径が小さい。なお、累積体積率５０％の粒子径で見た場合、従来の市販されている最も細かい高炉スラグ微粉末で３．０〜４．０μｍ程度である。 The blast furnace slag fine powder having a cumulative volume fraction of 50% and a particle size of 1.0 to 5.0 μm is average even when compared with the conventional general blast furnace slag fine powder 8000, as is clear from Table 1 described later. Small particle size. In addition, when it sees with the particle diameter of 50% of cumulative volume ratio, it is about 3.0-4.0 micrometers in the finest blast furnace slag fine powder conventionally marketed.
累積体積率５０％の粒子径が１．０〜５．０μｍの高炉スラグ微粉末の製造は、従来の高炉スラグ微粉末の製造で一般的なボールミルや竪型ミルなどの粉砕機で、4000程度まで粉砕した後に、分級をして粗い粒子を除去する方法が一般的である。この方法では収率が悪く、製造が困難であり、累積体積率５０％の粒子径が１．０〜３．０μｍ、さらに１．０〜２．０μｍでは困難となり実用化されていない。粉砕機を用いて１回および／または複数回の粉砕で累積体積率５０％の粒子径が１．０〜５．０μｍに収まるよう可能な限り細かく粉砕していく方法が効率的である。 Production of fine blast furnace slag powder with a cumulative volume fraction of 50% and a particle size of 1.0 to 5.0 μm is about 4000 using conventional ball mills and vertical mills for the production of conventional fine blast furnace slag powder. After pulverization to a general level, classification is performed to remove coarse particles. In this method, the yield is poor and the production is difficult, and when the particle size with a cumulative volume ratio of 50% is 1.0 to 3.0 [mu] m, and further 1.0 to 2.0 [mu] m, it becomes difficult and has not been put to practical use. It is efficient to use a pulverizer to pulverize as finely as possible so that the particle size with a cumulative volume ratio of 50% is 1.0 to 5.0 μm by pulverization once and / or multiple times.
本願発明の累積体積率５０％の粒子径が１．０〜５．０μｍの条件のもと、全細孔容積が０．０２ｃｍ３／ｇ以下の高炉スラグ微粉末は、全細孔容積が０．０２ｃｍ３／ｇを超える高炉スラグ微粉末に対し、セメント硬化物の製造における強度発現性に顕著な差はみられないが、流動性において大きな差があり、同一フローを得るための高性能ＡＥ減水剤の添加量を大幅に減らすことができる。また、長さ変化率で測定される硬化後の収縮も大幅に改善される。 The blast furnace slag fine powder having a total pore volume of 0.02 cm 3 / g or less under the condition that the particle diameter at a cumulative volume ratio of 50% of the present invention is 1.0 to 5.0 μm has a total pore volume of 0. Although there is no significant difference in strength development in the production of hardened cement for blast furnace slag fine powder exceeding 0.02 cm 3 / g, there is a large difference in fluidity and high performance AE for obtaining the same flow. The amount of water reducing agent added can be greatly reduced. In addition, shrinkage after curing as measured by the rate of change in length is greatly improved.
これは、従来のブレーン比表面積に基づく評価の場合に比べ、多孔質である高炉スラグ微粉末の細孔に起因する物性が評価でき、その物性の違いが流動性および硬化後の収縮に影響を与えているものと考えられる。 Compared to the conventional evaluation based on the specific surface area of Blaine, the physical properties attributed to the fine pores of the porous blast furnace slag powder can be evaluated, and the difference in physical properties affects the flowability and shrinkage after curing. It is thought to be given.
また、本願発明の高炉スラグ微粉末において、累積個数５０％の円形度が０．９５０以上であることが望ましい。 In the blast furnace slag fine powder of the present invention, it is desirable that the circularity of the cumulative number of 50% is 0.950 or more.
従来、混和材としての高炉スラグ微粉末は、粒度分布の幅が大きく、円形度は特に考慮されていないが、累積体積率５０％の粒子径が１．０〜５．０μｍの高炉スラグ微粉末では粒度分布の幅が小さく、セメントに混和してモルタルやコンクリートを製造したときに、円形度が高いほど均質で高品質の硬化物が得られる。 Conventionally, blast furnace slag fine powder as an admixture has a large particle size distribution, and circularity is not particularly considered, but a blast furnace slag fine powder having a cumulative volume fraction of 50% and a particle size of 1.0 to 5.0 μm. The particle size distribution has a small width, and when a mortar or concrete is produced by mixing with cement, the higher the circularity, the more homogeneous and high-quality cured product can be obtained.
本願発明では、円形度に関する評価を累積個数５０％の円形度で判断し、０．９５０以上としたが、これは従来の市販の高炉スラグ微粉末と比較し、十分高い円形度となっている。 In the present invention, the evaluation regarding the circularity is judged by the circularity of the cumulative number of 50% and set to 0.950 or more, which is sufficiently high compared with the conventional commercially available blast furnace slag fine powder. .
本願発明のセメント系組成物は、セメント（セメントの種類は限定されない）に加え、上述した本願発明の高炉スラグ微粉末が混和されていることを特徴とするものである。 The cementitious composition of the present invention is characterized in that, in addition to cement (the type of cement is not limited), the above-described fine powder of blast furnace slag of the present invention is mixed.
このセメント系組成物は、モルタル、コンクリートその他のセメント系硬化物の製造に用いられ、一般のモルタルやコンクリートの製造の場合と同様に、各種、混和材、混和剤を配合して使用することができる。 This cementitious composition is used in the production of mortar, concrete and other cement-based hardened products, and can be used by mixing various admixtures and admixtures as in the case of production of general mortar and concrete. it can.
本願発明の高炉スラグ微粉末およびセメント系組成物を用いて硬化物を製造した場合、従来のブレーン比表面積の大きい高炉スラグ微粉末を用いた場合と同等の高い強度発現性を発揮しつつ、流動性にも優れ、硬化体の収縮を抑える効果も高い。 When producing a cured product using the blast furnace slag fine powder and cementitious composition of the present invention, while exhibiting the same high strength expression as when using a conventional blast furnace slag fine powder with a large Blaine specific surface area, It has excellent properties and has a high effect of suppressing shrinkage of the cured product.
また、流動性に優れるため、同一フローを得るための高性能ＡＥ減水剤の添加量を大幅に減らすことができ、経済性が高い。 Moreover, since it is excellent in fluidity | liquidity, the addition amount of the high performance AE water reducing agent for obtaining the same flow can be reduced significantly, and economical efficiency is high.
本願発明の効果を確認するために、以下の実験を行った。
〔試料〕
表１は、実験に用いた高炉スラグ微粉末試料の物性をまとめたものである。
実施例：高炉スラグ微粉末Ａ、高炉スラグ微粉末Ｂ
比較例：高炉スラグ微粉末Ｃ
In order to confirm the effect of the present invention, the following experiment was conducted.
〔sample〕
Table 1 summarizes the physical properties of the blast furnace slag fine powder samples used in the experiments.
Example: Blast furnace slag fine powder A, Blast furnace slag fine powder B
Comparative Example: Blast Furnace Slag Fine Powder C
また、表１には、比較のため、JISの高炉スラグ微粉末4000、高炉スラグ微粉末6000、高炉スラグ微粉末8000に相当する市販の高炉スラグ微粉末について測定した物性を併せて表示している。 For comparison, Table 1 also shows physical properties measured for commercially available blast furnace slag fine powder equivalent to JIS blast furnace slag fine powder 4000, blast furnace slag fine powder 6000, and blast furnace slag fine powder 8000. .
表１のブレーン比表面積は、非特許文献１に基づく空隙率に依存しない比表面積の測定方法で測定をした。 The Blaine specific surface area in Table 1 was measured by a specific surface area measurement method that does not depend on the porosity based on Non-Patent Document 1.
表１では、レーザー回折・散乱法を測定原理とするレーザー回折・散乱式粒度分布測定装置（マイクロトラック・ベル株式会社製ＭＴ３０００ＥＸII）を用い粒子屈折率１．８１の条件で測定した値から算定した累積体積率５０％の粒子径を表示しており、本願発明の実施例となる高炉スラグ微粉末Ａ、高炉スラグ微粉末Ｂでは累積体積率５０％の粒子径がそれぞれ３．４μｍ、１．８μｍであった。これに対し、ブレーン比表面積では高炉スラグ微粉末Ａより大きい値、すなわち粒径が小さいと評価される比較例の高炉スラグ微粉末Ｃでは累積体積率５０％の粒子径が３．７μｍであった。 In Table 1, it calculated from the value measured on the conditions of particle | grain refractive index 1.81 using the laser diffraction and scattering type particle size distribution measuring device (Microtrack Bell Co., Ltd. MT3000EXII) which uses a laser diffraction and scattering method as a measurement principle. The particle diameter of the cumulative volume fraction 50% is displayed, and in the blast furnace slag fine powder A and the blast furnace slag fine powder B, which are examples of the present invention, the particle diameter of the cumulative volume fraction 50% is 3.4 μm and 1.8 μm, respectively. Met. On the other hand, in the Blaine specific surface area, a value larger than the blast furnace slag fine powder A, that is, the blast furnace slag fine powder C of the comparative example evaluated as having a small particle diameter, had a particle diameter of 3.7 μm with a cumulative volume ratio of 50%. .
なお、高炉スラグ微粉末4000、高炉スラグ微粉末6000、高炉スラグ微粉末8000との対比でみると、従来のＪＩＳ規格の高炉スラグ微粉末では、最も小さい高炉スラグ微粉末8000の場合で、５．１μｍであった。 In comparison with the blast furnace slag fine powder 4000, the blast furnace slag fine powder 6000, and the blast furnace slag fine powder 8000, the conventional JIS standard blast furnace slag fine powder is the smallest blast furnace slag fine powder 8000. It was 1 μm.
ＢＥＴ比表面積は、高速比表面積／細孔分布測定装置（カンタクローム・インスツルメンツ社製ＮＯＶＡ４２００ｅ）を用いた。１０５℃、５時間（真空脱気）で脱気して前処理をした試料を測定温度が７７．３Ｋ、相対圧力が０．０５から０．３０の６点の圧力範囲において固体表面に吸着した窒素ガス量の測定から得た吸着等温線（直線）から求めた。 For the BET specific surface area, a high-speed specific surface area / pore distribution measuring device (NOVA4200e manufactured by Cantachrome Instruments) was used. A sample pretreated by degassing at 105 ° C. for 5 hours (vacuum degassing) was adsorbed on the solid surface at a measurement temperature of 77.3 K and a relative pressure of 0.05 to 0.30 in a pressure range of 6 points. It was determined from the adsorption isotherm (straight line) obtained from the measurement of the amount of nitrogen gas.
ＢＥＴ比表面積は、１点法または多点法により測定される。多点法は、相対圧力が０．０５から０．３０の複数（３点以上）の圧力範囲において固体表面に吸着したガス量の測定から得た吸着等温線から求める。１点法は、吸着等温線の直線を示す範囲で相対圧力ができるだけ高いところを用いる。ミクロ細孔を持つ試料を１点法の測定では、相対圧力が０．１を超えると吸着等温線が直線を示さない場合がある。 The BET specific surface area is measured by a one-point method or a multipoint method. The multipoint method is obtained from an adsorption isotherm obtained from measurement of the amount of gas adsorbed on the solid surface in a plurality (three or more points) of pressure range where the relative pressure is 0.05 to 0.30. The one-point method uses a place where the relative pressure is as high as possible within the range showing the straight line of the adsorption isotherm. When measuring a sample having micropores by the one-point method, if the relative pressure exceeds 0.1, the adsorption isotherm may not show a straight line.
また、表１から明らかなように、各試料のブレーン比表面積の大小とＢＥＴ多点法比表面積の大小には、粒子内部に空隙を有するまたは粒子の形状が異なるため、１対１の対応関係ではない。たとえば、高炉スラグ微粉末Ｂは高炉スラグ微粉末Ｃよりブレーン比表面積が大きいが、ＢＥＴ多点法比表面積が小さい。ブレーン比表面積またはＢＥＴ多点法比表面積単独では、高炉スラグ微粉末の粒子の大きさなどの特性の評価が困難であることを示している。 Further, as apparent from Table 1, there is a one-to-one correspondence relationship between the size of the Blaine specific surface area and the size of the BET multipoint method specific surface area of each sample because there are voids inside the particles or the shape of the particles is different. is not. For example, although the blast furnace slag fine powder B has a larger Blaine specific surface area than the blast furnace slag fine powder C, it has a smaller BET multipoint specific surface area. It shows that it is difficult to evaluate characteristics such as the particle size of blast furnace slag fine powder by using Blaine specific surface area or BET multipoint specific surface area alone.
全細孔容積および細孔径（容積平均、微分最大値）は、高速・比表面積／細孔分布測定装置（カンタクローム・インスツルメンツ社製ＮＯＶＡ４２００ｅ）を用いた。１０５℃、５時間（真空脱気）で脱気して前処理をした試料を測定温度が７７．３Ｋ、相対圧力が０．０５から０．９９５の圧力範囲において固体表面に吸着した窒素ガス量の測定から得た吸着脱離等温線からＢＪＨ法によるメソ細孔分布計算から求めた。 For the total pore volume and pore diameter (volume average, differential maximum value), a high speed / specific surface area / pore distribution measuring device (NOVA4200e manufactured by Cantachrome Instruments) was used. The amount of nitrogen gas adsorbed on the solid surface at 105 ° C for 5 hours (vacuum degassing) and pretreated at a measurement temperature of 77.3K and a relative pressure of 0.05 to 0.995 From the adsorption / desorption isotherm obtained from the above measurement, the mesopore distribution was calculated by the BJH method.
高炉スラグ微粉末の円形度は、フロー式粒子像分析装置（シスメックス株式会社製ＦＰＩＡ−３０００Ｓ）を用いて、試料懸濁液（５０ｃｃビーカーに試料０．０４ｇと０．２％ヘキサメタリン酸ナトリウムを加えて３５ｍｌに定容した液を１００Ｗの超音波で３分間分散処理して作成）を扁平な試料流に形成させてストロボ光を照射することにより個々の粒子を静止画像として撮像させる。撮像した画像を画像処理により粒子画像の投影した部分の面積と周囲長から下記の式（１）による算出によって測定した。例えば、円の場合で円形度は１．０００、正六角形で０．９５２、正五角形で０．９３０、正方形で０．８８６となり、１．０００に近づくほど円形に近づく。 The circularity of the blast furnace slag fine powder was determined by adding a sample suspension (0.04 g of sample and 0.2% sodium hexametaphosphate to a 50 cc beaker) using a flow type particle image analyzer (FPIA-3000S manufactured by Sysmex Corporation). Each liquid is imaged as a still image by forming a liquid with a constant volume of 35 ml by dispersion treatment with ultrasonic waves of 100 W for 3 minutes to form a flat sample flow and irradiating with strobe light. The captured image was measured by calculation according to the following equation (1) from the area and circumference length of the projected portion of the particle image by image processing. For example, in the case of a circle, the degree of circularity is 1.000, a regular hexagon is 0.952, a regular pentagon is 0.930, a square is 0.886, and the closer to 1.000, the closer to a circle.
円形度＝２×（Ｓ×π）1/2／Ｃ … （１）
ここで、
Ｃ：粒子画像の投影した部分の周囲長
Ｓ：粒子画像の投影した部分の面積
Circularity = 2 × (S × π) 1/2 / C (1)
here,
C: Perimeter of the projected part of the particle image S: Area of the projected part of the particle image
高炉スラグ微粉末Ａ、高炉スラグ微粉末Ｂでは累積個数５０％の円形度がそれぞれ０．９５４、０．９５３であるのに対し、比較例となる高炉スラグ微粉末Ｃでは累積個数５０％の円形度は０．９４３であった。 In the blast furnace slag fine powder A and the blast furnace slag fine powder B, the circularity of the cumulative number 50% is 0.954 and 0.953, respectively, whereas in the blast furnace slag fine powder C which is a comparative example, the circular number of the cumulative number 50%. The degree was 0.943.
〔試験内容〕
表１の高炉スラグ微粉末Ａ〜Ｃを、表２に示す配合でセメント（普通ポルトランドセメント）に加え試験を行った。
〔contents of the test〕
Blast furnace slag fine powders A to C shown in Table 1 were added to cement (ordinary Portland cement) with the formulation shown in Table 2 and tested.
高炉スラグ微粉末Ａ、高炉スラグ微粉末Ｂを配合したNo.1〜No.6が本実施発明の実施例であり、高炉スラグ微粉末Ｃを配合したNo.7〜No.9は比較例である。 No.1 to No.6 containing blast furnace slag fine powder A and blast furnace slag fine powder B are examples of the present invention, and No.7 to No.9 containing blast furnace slag fine powder C are comparative examples. is there.
モルタルの配合は、水結合材比が３０％、砂／結合材(質量比)＝１．４、砂はJIS R 5201「セメント物理試験方法」で使用する標準砂とした。練り混ぜはJASS 5M-701に準拠して５分間の静置後に試験した。 The mortar was mixed with a water binder ratio of 30%, sand / binder (mass ratio) = 1.4, and the sand was standard sand used in JIS R 5201 “Cement physical test method”. The kneading was tested after standing for 5 minutes according to JASS 5M-701.
モルタルのフロー値が１５打フローで１６０±１０ｍｍ、空気量が４．０±０．８％になるように、高性能ＡＥ減水剤（BASFジャパン株式会社製SP8SV）と消泡剤（BASFジャパン株式会社製No.404）を使用した。 High-performance AE water reducing agent (BASF Japan Co., Ltd. SP8SV) and antifoaming agent (BASF Japan Co., Ltd.) so that the mortar flow value is 160 ± 10mm and the air volume is 4.0 ± 0.8% at 15 strokes. Company No. 404) was used.
試験は圧縮強度と長さ変化率について行い、圧縮強度は、φ５０×１００ｍｍ円柱供試体を水中養生で材齢１日（２４時間で脱型後に測定）、７日、２８日で行った。長さ変化率は、４０×４０×１６０ｍｍ角柱供試体を材齢４８時間後に脱型して、脱型後２０℃、相対湿度６０％気中養生で脱型後から３日、７日、１４日、２１日、２８日で測定を行った。 The test was performed on the compressive strength and the rate of change in length, and the compressive strength was measured at a material age of 1 day (measured after demolding at 24 hours), 7 days, and 28 days on a φ50 × 100 mm cylindrical specimen. The rate of change in length was determined by removing the 40 × 40 × 160 mm prism specimen 48 hours after the material age, 3 days, 7 days, 14 days after demolding at 20 ° C. and 60% relative humidity in air. Measurements were taken on days 21, 21 and 28.
〔試験結果〕
圧縮強度に関する試験結果を表３に示す。
〔Test results〕
Table 3 shows the test results regarding the compressive strength.
同一割合の高炉スラグ微粉末の添加において高炉スラグ微粉末Ｃを用いたNo.7、No.8は、同じフロー値を得るための高性能ＡＥ減水剤の添加率が高くなった。特に、No.9においては、練り混ぜができなかった。 No. 7 and No. 8 using blast furnace slag fine powder C in the addition of the same proportion of blast furnace slag fine powder had a higher addition rate of high-performance AE water reducing agent to obtain the same flow value. In particular, in No. 9, kneading was not possible.
実施例の高炉スラグ微粉末Ａ、Ｂがセメント中のＣ３Ｓ、間隙質相の水和反応を促進させたと推定されるため、同一割合の高炉スラグ微粉末の添加で材齢１日の圧縮強度が比較例よりも実施例が高くなった。
すなわち、本発明の高炉スラグ微粉末を用いることで、特に材齢１日といった早期強度が向上することがわかる。
Since it is presumed that the blast furnace slag fine powders A and B of the examples promoted the hydration reaction of C 3 S and the interstitial phase in the cement, the addition of the same proportion of the blast furnace slag fine powder resulted in a compression of one day of age. The strength of the example was higher than that of the comparative example.
That is, it can be seen that the use of the blast furnace slag fine powder of the present invention improves the early strength, particularly the age of one day.
長さ変化率に関する試験結果を表４に示す。 Table 4 shows the test results regarding the rate of change in length.
同一の高炉スラグ微粉末の添加において高炉スラグ微粉末Ｃを用いたNo.7は、実施例であるNo.1、No.4より長さ変化率が大きくなった。同様に同一の高炉スラグ微粉末の添加において高炉スラグ微粉末Ｃを用いたNo.8は、実施例であるNo.2、No.5より長さ変化率が大きくなった。 In the addition of the same blast furnace slag fine powder, No. 7 using the blast furnace slag fine powder C had a larger rate of change in length than No. 1 and No. 4 in the examples. Similarly, in the addition of the same blast furnace slag fine powder, No. 8 using the blast furnace slag fine powder C had a larger rate of change in length than No. 2 and No. 5 of the examples.
平均粒径（累積体積率５０％の粒子径）が同等である高炉スラグ微粉末Ｃより高炉スラグ微粉末Ａを用いた水準が小さい長さ変化率となった。また、平均粒径（累積体積率５０％の粒子径）が高炉スラグ微粉末Ｃより小さい高炉スラグ微粉末Ｂを用いた水準が小さい長さ変化率となった。従来の高炉スラグ微粉末Ｃように微粒部分の粒子が持つ多孔質による細孔は、高炉スラグ微粉末Ａと高炉スラグ微粉末Ｂが少ないためと推測される。
以上より、本発明の高炉スラグ微粉末を用いれば、硬化体の収縮が少なくなることがわかる。
The length change rate of the level using the blast furnace slag fine powder A was smaller than that of the blast furnace slag fine powder C having the same average particle diameter (particle diameter having a cumulative volume ratio of 50%). Moreover, the level using the blast furnace slag fine powder B smaller than the blast furnace slag fine powder C having an average particle diameter (particle diameter having a cumulative volume ratio of 50%) was a small length change rate. It is assumed that the fine pores of the fine particles as in the conventional blast furnace slag fine powder C are because the blast furnace slag fine powder A and the blast furnace slag fine powder B are small.
From the above, it can be seen that if the blast furnace slag fine powder of the present invention is used, the shrinkage of the cured body is reduced.
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