JP2014088294A - Cement composition - Google Patents

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JP2014088294A
JP2014088294A JP2012239875A JP2012239875A JP2014088294A JP 2014088294 A JP2014088294 A JP 2014088294A JP 2012239875 A JP2012239875 A JP 2012239875A JP 2012239875 A JP2012239875 A JP 2012239875A JP 2014088294 A JP2014088294 A JP 2014088294A
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Shinpei Maehori
伸平 前堀
Shingo Sugiyama
真悟 杉山
Hiroaki Mori
寛晃 森
Mitsuru Tanimura
充 谷村
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Taiheiyo Cement Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

PROBLEM TO BE SOLVED: To provide a cement composition for mortar and concrete which has excellent fluidity, a short kneading time and ultra-high strength developing properties.SOLUTION: A cement composition comprises: 65-90 mass% of Portland cement; 5-15 mass% of silica fume; and 5-20 mass% of fine powder of limestone. The silica fume has a BET specific surface area of 5-18 m/g, and the particle size distribution of the fine powder of limestone is 99 vol.% or more particles of particle sizes of 10 μm or smaller, 95 vol.% or more of particles of particle sizes of 5 μm or smaller, 70-93 vol.% of particles of particle sizes of 2 μm or smaller, 27-50 vol.% of particles of particle sizes of 1 μm or smaller and 15 vol.% or less of particles of particle sizes of 0.5 μm or smaller.

Description

本発明は、流動性に優れ、混練時間が短く、かつ超高強度発現性を有するモルタルおよびコンクリート用のセメント組成物に関する。   The present invention relates to a cement composition for mortar and concrete having excellent fluidity, a short kneading time, and an ultrahigh strength.

従来、高層建築物に用いられている高強度コンクリートは、一般にシリカフュームと高性能減水剤(高性能AE減水剤を含む。)を含有し、その設計基準強度はコンクリート標準示方書の規定では60〜100N/mm程度、水セメント比は20〜30%程度である。そして、該コンクリートは、低水セメント比と、シリカフュームのポゾラン反応およびマイクロフィラー効果等により、セメントペーストが緻密化して骨材との界面組織が強化され、高強度が発現するとされている。
しかし、シリカフュームを含む高強度コンクリートは粘性が高く流動性が低いため、混練時に空気を巻き込むと脱気されにくく、かえって強度が低下する場合があり、また、一般のコンクリートと比べて混練時間を延長する必要がある。そこで、流動性を上げるため高性能減水剤を増やすと、今度はコンクリートの凝結遅延や材料分離が起こり易くなる。このように、従来の高強度コンクリートでは、施工に必要な流動性を確保しつつ強度を高めることが容易ではなく、高性能減水剤やシリカフューム等の配合量の調節だけでは、強度と流動性がともに高いコンクリートを安定的に製造することは難しい。
Conventionally, high-strength concrete used for high-rise buildings generally contains silica fume and high-performance water reducing agent (including high-performance AE water reducing agent), and its design standard strength is 60 to About 100 N / mm 2 and the water cement ratio is about 20-30%. The concrete is said to exhibit high strength due to a low water cement ratio, a pozzolanic reaction of silica fume, a microfiller effect, and the like, whereby the cement paste becomes dense and the interface structure with the aggregate is strengthened.
However, high-strength concrete containing silica fume is highly viscous and low in fluidity. There is a need to. Therefore, if the amount of the high-performance water reducing agent is increased in order to increase the fluidity, then the setting delay of the concrete and the material separation easily occur. Thus, with conventional high-strength concrete, it is not easy to increase the strength while ensuring the fluidity necessary for construction, and the strength and fluidity can be achieved only by adjusting the blending amount of high-performance water reducing agent, silica fume, etc. In both cases, it is difficult to stably produce high concrete.

かかる状況を受けて、石灰石微粉末を含むセメント組成物が提案されている。
たとえば、特許文献1では、ポルトランドセメント50〜92重量部、シリカフューム5〜25重量部及び石灰石微粉末3〜25重量部を合計で100重量部含んでなるセメント組成物であって、該石灰石微粉末は、粒径20μm以下の粒子が90%以上、粒径10μm以下の粒子が65%以上、粒径5μm以下の粒子が40〜90%、粒径1μm以下の粒子が25%以下である粒度分布を持つセメント組成物が提案されている。また、特許文献2では、前記ポルトランドセメントに代えて高ビーライト系ポルトランドセメントを用いた以外は、前記と同じセメント組成物が提案されている。そして、これらのセメント組成物を用いたコンクリートの圧縮強度は、材齢28日や91日において1000kgf/cm(100N/mm)程度、水セメント比は22〜25%程度である(特許文献1の段落0082および段落0049、特許文献2の段落0053および段落0047を参照)。
Under such circumstances, a cement composition containing limestone fine powder has been proposed.
For example, in Patent Document 1, a cement composition comprising 50 to 92 parts by weight of Portland cement, 5 to 25 parts by weight of silica fume and 3 to 25 parts by weight of fine limestone powder, the limestone fine powder The particle size distribution is 90% or more of particles having a particle size of 20 μm or less, 65% or more of particles having a particle size of 10 μm or less, 40 to 90% of particles having a particle size of 5 μm or less, and 25% or less of particles having a particle size of 1 μm or less. A cement composition having the following has been proposed. Moreover, in patent document 2, it replaced with the said Portland cement and the cement composition same as the above was proposed except having used high belite type Portland cement. The compressive strength of concrete using these cement compositions is about 1000 kgf / cm 2 (100 N / mm 2 ) at a material age of 28 days or 91 days, and the water cement ratio is about 22 to 25% (patent document). 1 paragraph 0082 and paragraph 0049, and patent document 2, paragraph 0053 and paragraph 0047).

しかし、前記セメント組成物の出願から18年を経た現在では、建築物の超高層化が進み、設計の自由度や快適な居住空間を確保するため部材のスリム化や長スパン化が進展した結果、コンクリートの設計基準強度は150N/mm以上(以下「超高強度」という。)、水セメント比は10〜15%程度が求められている。
したがって、特許文献1や2に記載のセメント組成物では、前記のとおり、超高強度が得られないことから、流動性に優れ超高強度発現性を有するセメント組成物が望まれている。
However, since 18 years have passed since the filing of the cement composition, there has been a rise in the height of buildings, and as a result of the slimmer and longer span of members to ensure design freedom and comfortable living space. The design standard strength of concrete is 150 N / mm 2 or more (hereinafter referred to as “ultra-high strength”), and the water-cement ratio is required to be about 10 to 15%.
Therefore, in the cement composition described in Patent Documents 1 and 2, as described above, an ultra-high strength cannot be obtained. Therefore, a cement composition having excellent fluidity and an ultra-high strength expression is desired.

特許第3230378号公報Japanese Patent No. 3230378 特許第3267091号公報Japanese Patent No. 3267091

よって、本発明は、流動性に優れ、混練時間が短く、かつ超高強度発現性を有するモルタルおよびコンクリート用のセメント組成物を提供することを目的とする。   Therefore, an object of this invention is to provide the cement composition for mortar and concrete which is excellent in fluidity | liquidity, has a short kneading | mixing time, and has ultra high intensity | strength expression.

そこで、本発明者らは、前記目的にかなうセメント組成物を検討したところ、特許文献1および2に記載のシリカフュームよりも粒度が大きい(粗い)シリカフューム、および、特許文献1および2に記載の石灰石微粉末よりも粒度が小さく(細かく)かつ特定の粒度分布を有する石灰石微粉末とを含むセメント組成物は、モルタルおよびコンクリート(以下「コンクリート等」という。)に用いた場合、流動性に優れ超高強度発現性を有すること、および、コンクリート等の混練時間が短かいことを見い出し、本発明を完成させた。   Therefore, the present inventors have examined a cement composition that meets the above-mentioned purpose. As a result, the silica fume having a larger particle size (coarse) than the silica fume described in Patent Documents 1 and 2, and the limestone described in Patent Documents 1 and 2 are used. Cement compositions containing limestone fine powder having a particle size smaller (finer) than a fine powder and having a specific particle size distribution have excellent fluidity when used in mortar and concrete (hereinafter referred to as “concrete etc.”). The present invention has been completed by finding that it has high strength and has a short kneading time for concrete and the like.

すなわち、本発明は以下の構成を有するセメント組成物である。
[1]ポルトランドセメント65〜90質量%、シリカフューム5〜15質量%、および、石灰石微粉末5〜20質量%を含むセメント組成物であって、
前記シリカフュームのBET比表面積は5〜18m/gであり、
前記石灰石微粉末の粒度分布は、粒径10μm以下の粒子が99体積%以上、粒径5μm以下の粒子が95体積%以上、粒径2μm以下の粒子が70〜93体積%、粒径1μm以下の粒子が27〜50体積%、および、粒径0.5μm以下の粒子が15体積%以下であるセメント組成物。
[2]前記ポルトランドセメントが、中庸熱ポルトランドセメントおよび/または低熱ポルトランドセメントである、前記[1]に記載のセメント組成物。
[3]前記石灰石微粉末の粒度が0.1〜12.0μmである、前記[1]または[2]に記載のセメント組成物。
[4]前記石灰石微粉末の50%累積粒径が1.0〜1.3μmである、前記[1]〜[3]のいずれか1項に記載のセメント組成物。
That is, the present invention is a cement composition having the following configuration.
[1] A cement composition comprising 65 to 90% by mass of Portland cement, 5 to 15% by mass of silica fume, and 5 to 20% by mass of fine limestone powder,
The silica fume has a BET specific surface area of 5 to 18 m 2 / g,
The particle size distribution of the limestone fine powder is 99% by volume or more of particles having a particle size of 10 μm or less, 95% by volume or more of particles having a particle size of 5 μm or less, 70 to 93% by volume of particles having a particle size of 2 μm or less, and 1 μm or less of particle size. A cement composition in which 27 to 50% by volume of particles and 15% by volume or less of particles having a particle diameter of 0.5 μm or less.
[2] The cement composition according to [1], wherein the Portland cement is a medium heat Portland cement and / or a low heat Portland cement.
[3] The cement composition according to [1] or [2], wherein a particle size of the limestone fine powder is 0.1 to 12.0 μm.
[4] The cement composition according to any one of [1] to [3], wherein the 50% cumulative particle size of the fine limestone powder is 1.0 to 1.3 μm.

本発明のセメント組成物を用いれば、流動性に優れ、超高強度発現性を有するコンクリート等を、短い混練時間で製造することができる。   By using the cement composition of the present invention, it is possible to produce concrete having excellent fluidity and exhibiting ultrahigh strength in a short kneading time.

供試体の養生における温度履歴を示す図である。It is a figure which shows the temperature history in the curing of a test body.

本発明のセメント組成物は、前記のとおり、ポルトランドセメント、特定のBET比表面積を有するシリカフューム、および、特定の粒度分布を有する石灰石微粉末を含むセメント組成物である。以下、本発明について前記の各成分に分けて詳細に説明する。   As described above, the cement composition of the present invention is a cement composition including Portland cement, silica fume having a specific BET specific surface area, and limestone fine powder having a specific particle size distribution. Hereinafter, the present invention will be described in detail for each of the above components.

1.ポルトランドセメント
本発明のセメント組成物に用いるポルトランドセメントは、特に限定されず、普通ポルトランドセメント、早強ポルトランドセメント、中庸熱ポルトランドセメント、および低熱ポルトランドセメント等から選ばれる1種以上が挙げられる。これらの中で、コンクリート等の流動性が高く水和発熱が低いなどの点から、好ましくは中庸熱ポルトランドセメントおよび/または低熱ポルトランドセメントである。
また、セメント組成物中のポルトランドセメントの含有率は65〜90質量%であり、好ましくは72〜88質量%、より好ましくは75〜85質量%である。該値が65質量%未満ではコンクリート等の強度発現性が低下し、90質量%を超えるとコンクリート等の流動性が低下する。
1. Portland cement The Portland cement used in the cement composition of the present invention is not particularly limited, and examples thereof include one or more selected from ordinary Portland cement, early-strength Portland cement, moderately hot Portland cement, low heat Portland cement, and the like. Among these, medium heat Portland cement and / or low heat Portland cement are preferable from the viewpoint of high fluidity and low hydration heat of concrete and the like.
Moreover, the content rate of the Portland cement in a cement composition is 65-90 mass%, Preferably it is 72-88 mass%, More preferably, it is 75-85 mass%. When the value is less than 65% by mass, the strength development property of concrete or the like decreases, and when it exceeds 90% by mass, the fluidity of concrete or the like decreases.

2.シリカフューム
本発明のセメント組成物に用いるシリカフュームのBET比表面積は5〜18m/gである。該値がこの範囲を外れると、コンクリート等の流動性が低下する場合がある。また、前記BET比表面積は、入手の容易性やコスト等の点から、好ましくは12〜17m/g、より好ましくは13〜17m/gである。
また、セメント組成物中のシリカフュームの含有率は5〜15質量%であり、好ましくは7〜13質量%、より好ましくは8〜12質量%である。該値が5〜15質量%を外れるとコンクリート等の流動性が低下する場合がある。
2. Silica fume The BET specific surface area of the silica fume used for the cement composition of this invention is 5-18 m < 2 > / g. When the value is out of this range, the fluidity of concrete or the like may be reduced. Further, the BET specific surface area, in terms of ease and cost, and the like to obtain, preferably 12~17m 2 / g, more preferably 13~17m 2 / g.
Moreover, the content rate of the silica fume in a cement composition is 5-15 mass%, Preferably it is 7-13 mass%, More preferably, it is 8-12 mass%. When this value is outside 5 to 15% by mass, the fluidity of concrete and the like may be reduced.

3.石灰石微粉末
本発明のセメント組成物に用いる石灰石微粉末の粒度分布は、粒径10μm以下の粒子が99体積%以上、粒径5μm以下の粒子が95体積%以上、粒径2μm以下の粒子が70〜93体積%、粒径1μm以下の粒子が27〜50体積%、および、粒径0.5μm以下の粒子が15体積%以下である。該粒度分布が前記範囲において、コンクリート等の流動性が向上するとともに、コンクリート等の混練時間を短縮することができる。
前記石灰石微粉末の粒度分布は、好ましくは粒径10μm以下の粒子が99体積%以上、粒径5μm以下の粒子が97体積%以上、粒径2μm以下の粒子が73〜92体積%、粒径1μm以下の粒子が30〜48体積%、および、粒径0.5μm以下の粒子が13体積%以下であり、より好ましくは粒径5μm以下の粒子が98体積%以上、粒径2μm以下の粒子が75〜91体積%、粒径1μm以下の粒子が33〜46体積%、および、粒径0.5μm以下の粒子が11体積%以下である。これらの石灰石微粉末は、ボールミル等により石灰石を粉砕して分級することにより得られる。前記粒度や後記50%累積粒径は、レーザー回折・散乱式粒子径・粒度分布測定装置等により測定することができる。
3. Limestone fine powder The particle size distribution of the limestone fine powder used in the cement composition of the present invention is such that particles having a particle size of 10 μm or less are 99% by volume or more, particles having a particle size of 5 μm or less are 95% by volume, and particles having a particle size of 2 μm or less. 70 to 93% by volume, 27 to 50% by volume of particles having a particle size of 1 μm or less, and 15% by volume or less of particles having a particle size of 0.5 μm or less. When the particle size distribution is in the above range, the fluidity of concrete and the like is improved, and the kneading time of concrete and the like can be shortened.
The particle size distribution of the fine limestone powder is preferably 99% by volume or more for particles having a particle size of 10 μm or less, 97% by volume or more for particles having a particle size of 5 μm or less, and 73 to 92% by volume for particles having a particle size of 2 μm or less. Particles having a particle size of 1 μm or less are 30 to 48% by volume and particles having a particle size of 0.5 μm or less are 13% by volume or less, more preferably particles having a particle size of 5 μm or less are 98% by volume or more and particles having a particle size of 2 μm or less Is 75 to 91% by volume, particles having a particle size of 1 μm or less are 33 to 46% by volume, and particles having a particle size of 0.5 μm or less are 11% by volume or less. These fine limestone powders are obtained by pulverizing and classifying limestone with a ball mill or the like. The particle size and the 50% cumulative particle size described later can be measured by a laser diffraction / scattering particle size / particle size distribution measuring device or the like.

本発明のセメント組成物に用いる石灰石微粉末の粒度は、コンクリート等の流動性や強度発現性から、好ましくは0.1〜12μm、より好ましくは0.15〜10μm、さらに好ましくは0.2〜8μmである。
また、上記石灰石微粉末の50%累積粒径は、コンクリート等の流動性、混練時間、および強度発現性の観点から、好ましくは1.0〜1.3μm、より好ましくは1.05〜1.25μm、さらに好ましくは1.1〜1.2μmである。なお、前記50%累積粒径は、細かい粒子の側をゼロとした右上がりの累積分布において累積体積が50%となる粒径(d50)である。
さらに、本発明のセメント組成物に用いる石灰石微粉末は、コンクリート等の流動性、混練時間、および強度発現性の観点から、粒度が0.1〜12μmの範囲内に粒度分布のピークが2つ以上存在することが好ましい。
また、セメント組成物中の石灰石微粉末の含有率は5〜20質量%であり、好ましくは6〜15質量%、より好ましくは8〜13質量%である。該値が5〜20質量%を外れるとコンクリート等の流動性が低下する場合がある。
The particle size of the fine limestone powder used in the cement composition of the present invention is preferably 0.1 to 12 μm, more preferably 0.15 to 10 μm, and still more preferably 0.2 to 0.2 μm, from the fluidity and strength development properties of concrete and the like. 8 μm.
The 50% cumulative particle size of the fine limestone powder is preferably 1.0 to 1.3 μm, more preferably 1.05 to 1.5 in terms of fluidity of concrete, kneading time, and strength development. It is 25 μm, more preferably 1.1 to 1.2 μm. The 50% cumulative particle size is a particle size (d 50 ) at which the cumulative volume is 50% in a cumulative distribution that rises to the right with the fine particle side being zero.
Further, the limestone fine powder used in the cement composition of the present invention has two particle size distribution peaks in the range of 0.1 to 12 μm in particle size from the viewpoint of fluidity of concrete and the like, kneading time, and strength development. It is preferable to exist above.
Moreover, the content rate of the limestone fine powder in a cement composition is 5-20 mass%, Preferably it is 6-15 mass%, More preferably, it is 8-13 mass%. When this value is outside 5 to 20% by mass, the fluidity of concrete or the like may be reduced.

4.その他の任意の成分
本発明のセメント組成物は前記の必須の成分のほかに、任意の成分としてさらに高炉スラグ、製鋼スラグ、フライアッシュ、石炭灰、シリカ粉末等をセメント組成物の物性を損なわない範囲で含んでもよい。
4). Other optional components In addition to the above-mentioned essential components, the cement composition of the present invention may further include blast furnace slag, steelmaking slag, fly ash, coal ash, silica powder, etc. as optional components without impairing the physical properties of the cement composition. It may be included in the range.

5.セメント組成物の製造方法
本発明のセメント組成物の製造方法は、特に限定されず、たとえば、(1)ポルトランドセメント、シリカフュームおよび石灰石微粉末を、それぞれ計量して混合する方法や、(2)ポルトランドセメントクリンカ、石膏およびシリカフュームを混合して粉砕した後に、石灰石微粉末を添加して混合する方法等が挙げられる。これらの方法により製造したセメント組成物(プレミックス品)は、コンクリート等の混練に用いると、混練時間を短縮でき混練作業が容易になるため好適である。
5. Method for Producing Cement Composition The method for producing the cement composition of the present invention is not particularly limited. For example, (1) Portland cement, silica fume and limestone fine powder are respectively weighed and mixed, and (2) Portland cement. Examples include a method of adding and mixing fine powder of limestone after mixing and pulverizing tonclinker, gypsum and silica fume. When the cement composition (premix product) produced by these methods is used for kneading concrete or the like, the kneading time can be shortened and the kneading operation becomes easy.

以下、本発明を実施例により具体的に説明するが、本発明はこれらの実施例に限定されない。
1.使用材料
(1)中庸熱ポルトランドセメント(M)
表乾比重は3.21、太平洋セメント社製である。
(2)シリカフューム(SF1)
表乾比重は2.25、BET比表面積は14m/g、エルケム社製である。
(3)シリカフューム(SF2)
表乾比重は2.25、BET比表面積は20m/g、エルケム社製である。
(4)石灰石微粉末(LP1)
粒度分布は、粒径10μm以下の粒子が100体積%、粒径5μm以下の粒子が99.5体積%、粒径2μm以下の粒子が83体積%、粒径1μm以下の粒子が43体積%、および、粒径0.5μm以下の粒子が8体積%である。
また、50%累積粒径は1.15μm、比表面積は32000cm/g、商品名はソフトン3200、備北粉化工業社製である。
(5)石灰石微粉末(LP2)
LP2は、特許文献1および2の実施例に用いられた石灰石微粉末に相当する。
粒度分布は、粒径20μm以下の粒子が96体積%、粒径10μm以下の粒子が74体積%、粒径5μm以下の粒子が48体積%、および、粒径1μm以下の粒子が6体積%である。
また、50%累積粒径は5.2μm、比表面積は10000cm/g、商品名はソフトン1000、備北粉化工業社製である。
(6)石灰石微粉末(LP3)
粒度分布は、粒径20μm以下の粒子が45体積%、粒径10μm以下の粒子が21体積%、粒径5μm以下の粒子が14体積%、および、粒径1μm以下の粒子が2体積%である。
また、50%累積粒径は25μm、比表面積は4000cm/g、品番はBF200、備北粉化工業社製である。
なお、前記LP1〜3は石灰石を乾式で粉砕し分級して調製したもので、表乾比重はすべて2.71である。
(7)細骨材(S)
静岡県掛川市産の山砂、表乾比重は2.56である。
(8)高性能減水剤(SP)
商品名はレオビルドSP8HU(登録商標)、BASFジャパン社製である。
(9)空気量調整剤
商品名はマイクロエア404(登録商標)、BASFジャパン社製である。
(10)水(W)
水道水である。
EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples.
1. Materials used (1) Medium heat Portland cement (M)
The surface dry specific gravity is 3.21, manufactured by Taiheiyo Cement.
(2) Silica fume (SF1)
The surface dry specific gravity is 2.25, the BET specific surface area is 14 m 2 / g, and manufactured by Elchem.
(3) Silica fume (SF2)
The surface dry specific gravity is 2.25, the BET specific surface area is 20 m 2 / g, manufactured by Elchem.
(4) Limestone fine powder (LP1)
The particle size distribution is 100% by volume for particles having a particle size of 10 μm or less, 99.5% by volume for particles having a particle size of 5 μm or less, 83% by volume for particles having a particle size of 2 μm or less, 43% by volume for particles having a particle size of 1 μm or less, And the particle | grains with a particle size of 0.5 micrometer or less are 8 volume%.
Further, the 50% cumulative particle size is 1.15 μm, the specific surface area is 32000 cm 2 / g, the trade names are Softon 3200, manufactured by Bihoku Flour Industry Co., Ltd.
(5) Limestone fine powder (LP2)
LP2 corresponds to the fine limestone powder used in Examples of Patent Documents 1 and 2.
The particle size distribution is 96% by volume for particles having a particle size of 20 μm or less, 74% by volume for particles having a particle size of 10 μm or less, 48% by volume for particles having a particle size of 5 μm or less, and 6% by volume for particles having a particle size of 1 μm or less. is there.
The 50% cumulative particle size is 5.2 μm, the specific surface area is 10000 cm 2 / g, the trade names are Softon 1000, manufactured by Bihoku Flour Industry Co., Ltd.
(6) Limestone fine powder (LP3)
The particle size distribution is 45% by volume for particles having a particle size of 20 μm or less, 21% by volume for particles having a particle size of 10 μm or less, 14% by volume for particles having a particle size of 5 μm or less, and 2% by volume for particles having a particle size of 1 μm or less. is there.
Further, the 50% cumulative particle size is 25 μm, the specific surface area is 4000 cm 2 / g, the product number is BF200, manufactured by Bihoku Flourishing Industry Co., Ltd.
The LP1 to LP3 were prepared by pulverizing and classifying limestone in a dry manner, and all the surface dry specific gravity was 2.71.
(7) Fine aggregate (S)
Mountain sand from Kakegawa City, Shizuoka Prefecture, surface dry specific gravity is 2.56.
(8) High performance water reducing agent (SP)
The product names are Leo Build SP8HU (registered trademark), manufactured by BASF Japan.
(9) Air amount adjusting agent The trade name is Micro Air 404 (registered trademark), manufactured by BASF Japan.
(10) Water (W)
Tap water.

2.試験方法
(1)モルタルの調製
表1および表2の配合に従い計量した各材料を、容量が5リットルのホバートミキサーに入れて30秒間空練りした後、注水して5分間混練した。ただし、混練が不十分(フロー値が200mm以下)である場合は、最長で注水後10分間混練した。表2に注水後の混練時間を示す。
(2)流動性の測定
前記混練後、直ちに前記モルタルをJIS R 5201に規定するフローコーンに詰めて該コーンを真上に取り去り、そのまま180秒静置して、流動した後のモルタルの長さを測定した。
(3)圧縮強度の測定
前記モルタルを内径5cm、長さ10cmの型枠に入れて、図1に示す温度履歴の下で養生して供試体を作製した。そして、該供試体の材齢7日における圧縮強度をJIS A 1108に準じて測定した。
以上の測定結果を表2に示す。
2. Test method (1) Preparation of mortar Each material weighed in accordance with the composition shown in Tables 1 and 2 was put into a Hobart mixer having a capacity of 5 liters, kneaded for 30 seconds, then poured into water and kneaded for 5 minutes. However, when kneading was insufficient (the flow value was 200 mm or less), kneading was performed for 10 minutes at the longest after water injection. Table 2 shows the kneading time after water injection.
(2) Measurement of fluidity Immediately after the kneading, the mortar is packed in a flow cone as defined in JIS R 5201, the corn is removed directly above, left as it is for 180 seconds, and the length of the mortar after flowing. Was measured.
(3) Measurement of compressive strength The mortar was put into a mold having an inner diameter of 5 cm and a length of 10 cm, and was cured under a temperature history shown in FIG. And the compressive strength in the age of 7 days of this test body was measured according to JIS A1108.
The above measurement results are shown in Table 2.

Figure 2014088294
Figure 2014088294

Figure 2014088294
Figure 2014088294

表2から以下のことがいえる。
(1)混練時間と流動性
実施例1〜6は混練時間5分でフロー値が275〜286mmと高く、短い混練時間で高い流動性が発現する。
これに対し、比較例1、2、7は混練時間を10分に延長しても、フロー値はそれぞれ104mm、190mm、210mmと極めて低い。また、比較例5、6、8は混練時間をそれぞれ8分、9分、9分に延長しても、フロー値はそれぞれ255mm、239mm、225mmと低く前記実施例が示す程の流動性は得られない。比較例4も混練時間5分ではフロー値が204mmと低い。
(2)圧縮強度
圧縮強度は、比較例3では177mmであるのに対し、実施例1〜6では201〜209N/mmであるから、本発明のセメント組成物は強度発現性が高い。ちなみに、実施例1〜6のモルタルの圧縮強度である201〜209N/mmは、同一配合のモルタル部分を有するコンクリートに換算すると150N/mm程度以上に相当する。
なお、比較例3はフロー値が280mmと大きいが、圧縮強度は177N/mmと低いため超高層建築物の用途には適さない。
以上の結果から、本発明のセメント組成物を用いたコンクリート等は、流動性に優れ、混練時間が短く、かつ超高強度発現性を有することがわかる。
From Table 2, the following can be said.
(1) Kneading time and fluidity In Examples 1 to 6, the flow value is as high as 275 to 286 mm when the kneading time is 5 minutes, and high fluidity is exhibited with a short kneading time.
In contrast, Comparative Examples 1, 2, and 7 have extremely low flow values of 104 mm, 190 mm, and 210 mm, respectively, even when the kneading time is extended to 10 minutes. In Comparative Examples 5, 6, and 8, the flow values were as low as 255 mm, 239 mm, and 225 mm, respectively, even when the kneading time was extended to 8 minutes, 9 minutes, and 9 minutes, respectively. I can't. In Comparative Example 4, the flow value is as low as 204 mm when the kneading time is 5 minutes.
(2) Compressive strength Since the compressive strength is 177 mm in Comparative Example 3 and 201 to 209 N / mm 2 in Examples 1 to 6, the cement composition of the present invention has high strength development. Incidentally, 201~209N / mm 2 which is the compressive strength of the mortar of Examples 1 to 6 correspond to the 150 N / mm 2 approximately more terms of concrete with mortar part of the same formulation.
In addition, although the flow value of Comparative Example 3 is as large as 280 mm, the compressive strength is as low as 177 N / mm 2 , so that it is not suitable for use in a high-rise building.
From the above results, it can be seen that the concrete or the like using the cement composition of the present invention is excellent in fluidity, has a short kneading time, and has an ultrahigh strength expression.

Claims (4)

ポルトランドセメント65〜90質量%、シリカフューム5〜15質量%、および、石灰石微粉末5〜20質量%を含むセメント組成物であって、
前記シリカフュームのBET比表面積は5〜18m/gであり、
前記石灰石微粉末の粒度分布は、粒径10μm以下の粒子が99体積%以上、粒径5μm以下の粒子が95体積%以上、粒径2μm以下の粒子が70〜93体積%、粒径1μm以下の粒子が27〜50体積%、および、粒径0.5μm以下の粒子が15体積%以下であるセメント組成物。
A cement composition comprising 65 to 90% by weight of Portland cement, 5 to 15% by weight of silica fume, and 5 to 20% by weight of fine limestone powder,
The silica fume has a BET specific surface area of 5 to 18 m 2 / g,
The particle size distribution of the limestone fine powder is 99% by volume or more of particles having a particle size of 10 μm or less, 95% by volume or more of particles having a particle size of 5 μm or less, 70 to 93% by volume of particles having a particle size of 2 μm or less, and 1 μm or less of particle size. A cement composition in which 27 to 50% by volume of particles and 15% by volume or less of particles having a particle diameter of 0.5 μm or less.
前記ポルトランドセメントが、中庸熱ポルトランドセメントおよび/または低熱ポルトランドセメントである、請求項1に記載のセメント組成物。   The cement composition according to claim 1, wherein the Portland cement is a medium heat Portland cement and / or a low heat Portland cement. 前記石灰石微粉末の粒度が0.1〜12.0μmである、請求項1または2に記載のセメント組成物。   The cement composition according to claim 1 or 2, wherein a particle size of the limestone fine powder is 0.1 to 12.0 µm. 前記石灰石微粉末の50%累積粒径が1.0〜1.3μmである、請求項1〜3のいずれか1項に記載のセメント組成物。   The cement composition according to any one of claims 1 to 3, wherein the 50% cumulative particle size of the limestone fine powder is 1.0 to 1.3 µm.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016145134A (en) * 2015-02-09 2016-08-12 株式会社日本触媒 Functional hydraulic inorganic particle and hydraulic particle containing the same
JP2017095931A (en) * 2015-11-20 2017-06-01 太平洋セメント株式会社 Bridge web member and method for producing the same
JP2017226587A (en) * 2016-06-24 2017-12-28 住友大阪セメント株式会社 Concrete composition

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016145134A (en) * 2015-02-09 2016-08-12 株式会社日本触媒 Functional hydraulic inorganic particle and hydraulic particle containing the same
JP2017095931A (en) * 2015-11-20 2017-06-01 太平洋セメント株式会社 Bridge web member and method for producing the same
JP2017226587A (en) * 2016-06-24 2017-12-28 住友大阪セメント株式会社 Concrete composition

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