JP2008037685A - Cement additive and cement composition - Google Patents

Cement additive and cement composition Download PDF

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JP2008037685A
JP2008037685A JP2006212808A JP2006212808A JP2008037685A JP 2008037685 A JP2008037685 A JP 2008037685A JP 2006212808 A JP2006212808 A JP 2006212808A JP 2006212808 A JP2006212808 A JP 2006212808A JP 2008037685 A JP2008037685 A JP 2008037685A
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mass
cement
parts
sio
fired product
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Kenichi Honma
健一 本間
Daisuke Kurokawa
大亮 黒川
Tomohisa Yoshikawa
知久 吉川
Makihiko Ichikawa
牧彦 市川
Makoto Kobayakawa
真 小早川
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Taiheiyo Cement Corp
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
    • C04B2103/0079—Rheology influencing agents
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
    • C04B2103/0089—Agents for reducing heat of hydration
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00215—Mortar or concrete mixtures defined by their oxide composition
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cement additive with which a cement composition has a reduced heat of hydration, an improved fluidity, and is easily produced (ground). <P>SOLUTION: The cement additive is obtained by grinding a fired body which comprises 2CaO-SiO<SB>2</SB>and 2CaO-Al<SB>2</SB>O<SB>3</SB>-SiO<SB>2</SB>and has a bulk density of 900-1,200 g/L, wherein 10-100 pts.mass of 2CaO-Al<SB>2</SB>O<SB>3</SB>-SiO<SB>2</SB>+4CaO-Al<SB>2</SB>O<SB>3</SB>-Fe<SB>2</SB>O<SB>3</SB>and at most 20 pts.mass of 3CaO-Al<SB>2</SB>O<SB>3</SB>are contained based on 100 pts.mass of 2CaO-SiO<SB>2</SB>. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、セメント組成物の水和熱を低下させ、流動性を向上させるとともに、粉砕が容易なセメント添加材に関する。   The present invention relates to a cement additive that reduces the heat of hydration of a cement composition, improves fluidity, and is easily pulverized.

従来、廃棄物等を原料として大量に使用した焼成物を粉砕してなるセメント混和材として、２ＣａＯ・ＳｉＯ2（Ｃ2Ｓ）と２ＣａＯ・Ａｌ2Ｏ3・ＳｉＯ2（Ｃ2ＡＳ）を含有し、Ｃ2Ｓ １００質量部に対して、Ｃ2ＡＳ＋４ＣａＯ・Ａｌ2Ｏ3・Ｆｅ2Ｏ3（Ｃ4ＡＦ）を１０〜１００質量部含有し、３ＣａＯ・Ａｌ2Ｏ3（Ｃ3Ａ）の含有量が２０質量部以下である焼成物を粉砕したものが知られている（特許文献１）。 Conventionally, 2CaO · SiO 2 (C 2 S) and 2CaO · Al 2 O 3 · SiO 2 (C 2 AS) are included as cement admixtures obtained by pulverizing burned materials that use waste in large quantities as raw materials. And 10 to 100 parts by mass of C 2 AS + 4CaO.Al 2 O 3 .Fe 2 O 3 (C 4 AF) with respect to 100 parts by mass of C 2 S, and 3CaO · Al 2 O 3 (C 3 A) The thing which grind | pulverized the baked product whose content of 20 mass parts or less is known (patent document 1).

このセメント混和材は、セメント組成物の水和熱を低下させ、かつ流動性を向上させることができるものであるが、焼成物の被粉砕性が悪く、焼成物の粉砕に手間がかかるという問題があった。
特開２００４−２１５５号公報 This cement admixture can lower the heat of hydration of the cement composition and improve the fluidity, but the problem is that the fired product is poorly pulverized and it takes time to grind the fired product. was there.
JP 2004-2155 A

従って、本発明の目的は、セメント組成物の水和熱を低下させ、流動性を向上させるとともに、製造（粉砕）が容易なセメント添加材を提供することにある。   Accordingly, an object of the present invention is to provide a cement additive that can reduce the heat of hydration of a cement composition, improve fluidity, and can be easily manufactured (pulverized).

かかる実情において、本発明者らは、鋭意研究を行った結果、前記のような焼成物のうち、特定範囲の容重のものが、被粉砕性が良好で、容易に粉砕できることを見出し、本発明を完成した。   In such a situation, the present inventors have conducted intensive research, and as a result, among the fired products as described above, have found that those having a specific range of weight have good grindability and can be easily pulverized. Was completed.

すなわち、本発明は、Ｃ2Ｓ及びＣ2ＡＳを含有し、Ｃ2Ｓ １００質量部に対して、Ｃ2ＡＳ＋Ｃ4ＡＦが１０〜１００質量部であり、Ｃ3Ａの含有量が２０質量部以下で、かつ、容重が９００〜１２００ｇ／Ｌである焼成物を粉砕してなるセメント添加材を提供するものである。
また、本発明は、セメントと、当該セメント添加材を含有するセメント組成物を提供するものである。 That is, the present invention contains C 2 S and C 2 AS, with respect to C 2 S 100 parts by weight, a C 2 AS + C 4 AF is 10 to 100 parts by weight, the content of C 3 A 20 mass And a cement additive formed by pulverizing a fired product having a weight of 900 to 1200 g / L.
Moreover, this invention provides the cement composition containing a cement and the said cement additive.

本発明のセメント添加材は、焼成物の被粉砕性に優れるので、容易に製造（粉砕）することができる。本発明のセメント添加材を用いれば、水和熱が低く、かつ流動性が良好なセメント組成物を得ることができる。
さらに、本発明の添加材は、産業廃棄物、一般廃棄物等を原料として用いることができるので、廃棄物の有効利用の促進にも貢献することができる。 Since the cement additive of the present invention is excellent in grindability of the fired product, it can be easily manufactured (pulverized). If the cement additive of the present invention is used, a cement composition having a low heat of hydration and good fluidity can be obtained.
Furthermore, since the additive of the present invention can use industrial waste, general waste or the like as a raw material, it can also contribute to promotion of effective use of waste.

本発明で用いる焼成物は、Ｃ2Ｓ及びＣ2ＡＳを含有するもので、Ｃ2Ｓ１００質量部に対して、Ｃ2ＡＳ＋Ｃ4ＡＦを１０〜１００質量部、好ましくは１５〜９０質量部含有するものである。Ｃ2ＡＳ＋Ｃ4ＡＦ含有量が１０質量部未満では、焼成時に焼成温度を上げてもフリーライム量（未反応ＣａＯ量）が低下しにくく、焼成が困難になり、また、生成するＣ2Ｓも水和活性のないγ型Ｃ2Ｓである可能性が高くなり、セメントの強度を大きく低下させることがある。一方、Ｃ2ＡＳ＋Ｃ4ＡＦ含有量が１００質量部を超えると、高温における融液が増加するため、焼成可能温度が狭まり、またＣ2Ｓが少ないため、セメント組成物の強度発現性が低下する。
なお、本発明においては、Ｃ2ＡＳ質量の７０質量％以下がＣ4ＡＦであるのが好ましい。Ｃ4ＡＦがこの範囲を超えると、焼成の温度範囲が狭くなり、製造の管理が難しくなる。 Calcined product used in the present invention, those containing the C 2 S and C 2 AS, with respect to C 2 S100 parts by 10 to 100 parts by weight of C 2 AS + C 4 AF, containing preferably 15 to 90 parts by weight To do. When the content of C 2 AS + C 4 AF is less than 10 parts by mass, the amount of free lime (the amount of unreacted CaO) is hardly lowered even when the firing temperature is increased during firing, and firing becomes difficult, and the generated C 2 S is also The possibility of γ-type C 2 S having no hydration activity increases, and the strength of the cement may be greatly reduced. On the other hand, when the content of C 2 AS + C 4 AF exceeds 100 parts by mass, the melt at high temperature increases, the sinterable temperature is narrowed, and the C 2 S is low, so that the strength development of the cement composition is reduced. .
In the present invention, it is preferable that 70% by mass or less of the C 2 AS mass is C 4 AF. When C 4 AF exceeds this range, the temperature range for firing becomes narrow, and manufacturing management becomes difficult.

焼成物は、Ｃ2Ｓ１００質量部に対するＣ3Ａの含有量が２０質量部以下、好ましくは１０質量部以下である。２０質量部を超えると、セメント組成物の水和熱が上昇し、流動性も悪化する。 The calcined product has a C 3 A content of 20 parts by mass or less, preferably 10 parts by mass or less, relative to 100 parts by mass of C 2 S. When it exceeds 20 parts by mass, the heat of hydration of the cement composition increases and the fluidity also deteriorates.

このような組成の焼成物の原料としては、一般のポルトランドセメントクリンカー原料、例えば、石灰石、生石灰、消石灰等のＣａＯ原料；珪石、粘土等のＳｉＯ2原料；粘土等のＡｌ2Ｏ3原料；鉄滓、鉄ケーキ等のＦｅ2Ｏ3原料を使用することができる。
また、産業廃棄物、一般廃棄物及び建設発生土から選ばれる１種以上を原料とし、これを焼成することにより製造することができる。産業廃棄物としては、例えば生コンスラッジ；下水汚泥、浄水汚泥、建設汚泥、製鉄汚泥等の各種汚泥；建設廃材、コンクリート廃材、ボーリング廃土、各種焼却灰、鋳物砂、ロックウール、廃ガラス、高炉２次灰などが挙げられ；一般廃棄物としては、例えば下水汚泥乾粉、都市ごみ焼却灰、貝殻等が挙げられる。また、建設発生土としては、建設現場や工事現場等から発生する土壌や残土、さらには廃土壌等が挙げられる。 As a raw material of the fired product having such a composition, a general Portland cement clinker raw material, for example, a CaO raw material such as limestone, quicklime or slaked lime; a SiO 2 raw material such as silica or clay; an Al 2 O 3 raw material such as clay; iron Fe 2 O 3 raw materials such as rice cake and iron cake can be used.
Moreover, it can manufacture by making 1 or more types chosen from an industrial waste, a general waste, and construction generation | occurrence | production soil as a raw material, and baking this. Industrial waste includes, for example, raw conslag; various sludges such as sewage sludge, purified water sludge, construction sludge, and iron sludge; construction waste, concrete waste, boring waste, various incineration ash, foundry sand, rock wool, waste glass, blast furnace Secondary ash etc. are mentioned; Examples of general waste include sewage sludge dry powder, municipal waste incineration ash, shells and the like. In addition, examples of construction generated soil include soil and residual soil generated from construction sites and construction sites, and waste soil.

焼成物の鉱物組成は、使用原料中のＣａＯ、ＳｉＯ2、Ａｌ2Ｏ3、Ｆｅ2Ｏ3の各含有量（質量％）から、次式により求めることができる。
Ｃ4ＡＦ＝3.04×Fe2O3
Ｃ3Ａ＝1.61×CaO−3.00×SiO2−2.26×Fe2O3
Ｃ2ＡＳ＝−1.63×CaO＋3.04×SiO2＋2.69×Al2O3＋0.57×Fe2O3
Ｃ2Ｓ＝1.02×CaO＋0.95×SiO2−1.69×Al2O3−0.36×Fe2O3 The mineral composition of the calcined product can be obtained from the contents (mass%) of CaO, SiO 2 , Al 2 O 3 and Fe 2 O 3 in the raw materials used by the following formula.
C 4 AF = 3.04 × Fe 2 O 3
C 3 A = 1.61 × CaO−3.00 × SiO 2 −2.26 × Fe 2 O 3
C 2 AS = -1.63 x CaO + 3.04 x SiO 2 + 2.69 x Al 2 O 3 + 0.57 x Fe 2 O 3
C 2 S = 1.02 × CaO + 0.95 × SiO 2 −1.69 × Al 2 O 3 −0.36 × Fe 2 O 3

従って、例えば、廃棄物原料中にカルシウムが不足する場合には、その不足分を調整するために、石灰石等を混合して用いることができる。混合割合は、廃棄物原料の組成に応じて、得られる焼成物の組成が、本発明の範囲内になるよう、適宜決定すれば良い。   Therefore, for example, when calcium is insufficient in the waste material, limestone or the like can be mixed and used to adjust the shortage. What is necessary is just to determine a mixing ratio suitably according to the composition of a waste raw material so that the composition of the obtained baked product may become in the range of this invention.

本発明においては、焼成物中のＳＯ3量が０．５〜３質量％、特に０．７〜２質量％であるのが、焼成物の容重を９００〜１２００ｇ／Ｌに調整するためや、焼成中のＳＯ3の揮発の低減、カルシウムサルホアルミネートの生成を抑制するために好ましい。
ＳＯ3原料としては、廃石膏ボード、廃硫酸等の廃棄物原料を使用することができる。また、石膏も使用することができる。さらに、ペトコークス等の高硫黄含有燃料を使用することもできる。
なお、ＳＯ3を含む焼成物においては、カルシウムサルホアルミネートの含有量が１質量％以下、特に０．５質量％以下であるのが、セメント組成物の水和熱を低下させ、良好な流動性を得るために好ましい。 In the present invention, the amount of SO 3 in the fired product is 0.5 to 3% by mass, particularly 0.7 to 2% by mass in order to adjust the weight of the fired product to 900 to 1200 g / L. This is preferable for reducing the volatilization of SO 3 during firing and suppressing the formation of calcium sulfoaluminate.
As the SO 3 raw material, waste raw materials such as waste gypsum board and waste sulfuric acid can be used. Gypsum can also be used. Furthermore, a high sulfur content fuel such as pet coke can also be used.
In the calcined product containing SO 3 , the content of calcium sulfoaluminate is 1% by mass or less, particularly 0.5% by mass or less, which lowers the heat of hydration of the cement composition and provides good flow. It is preferable for obtaining the properties.

これらを焼成する際の焼成温度は、１２００〜１４００℃、特に１２５０〜１３７０℃であるのが、焼成工程の熔融相の状態が良好であるので好ましい。
用いる装置は特に限定されず、例えばロータリーキルン等を用いることができる。また、ロータリーキルンで焼成する際には、燃料代替廃棄物、例えば廃油、廃タイヤ、廃プラスチック等を使用することができる。 The firing temperature when firing these is preferably 1200 to 1400 ° C., particularly 1250 to 1370 ° C., because the state of the molten phase in the firing step is favorable.
The apparatus to be used is not specifically limited, For example, a rotary kiln etc. can be used. Moreover, when baking with a rotary kiln, a fuel alternative waste, for example, waste oil, a waste tire, a waste plastic, etc. can be used.

このような焼成により、Ｃ2ＡＳが生成し、その分Ｃ3Ａ量がＢｏｇｕｅ式から導かれる量よりも少なくなり、本発明のような組成の焼成物を得ることができる。
なお、本発明においては、焼成物中のフリーライム量は、セメント組成物の水和熱や流動性等の点から、１．５質量％以下、特に１質量％以下であるのが好ましい。 By such firing, C 2 AS is generated, and accordingly, the amount of C 3 A is less than the amount derived from the Bogue equation, and a fired product having the composition of the present invention can be obtained.
In the present invention, the amount of free lime in the fired product is preferably 1.5% by mass or less, particularly 1% by mass or less, from the viewpoint of heat of hydration, fluidity and the like of the cement composition.

なお、本発明においては、ロータリーキルンで焼成する際、キルンバーナの燃料量、空気量、キルン回転数及びキルン内通風量等を制御することによっても、焼成物の容重を９００〜１２００ｇ／Ｌに調整することができる。   In addition, in this invention, when baking with a rotary kiln, the weight of a baked product is adjusted to 900-1200 g / L also by controlling the fuel amount of a kiln burner, the amount of air, kiln rotation speed, the amount of ventilation in a kiln, etc. be able to.

本発明において、焼成物の容重は、９００〜１２００ｇ／Ｌ、好ましくは９５０〜１１５０ｇ／Ｌ、特に好ましくは９７０〜１１３０ｇ／Ｌである。容重が９００ｇ／Ｌ未満では、セメント組成物の強度発現性が低下し、１２００ｇ／Ｌを超えると、焼成物の被粉砕性が悪くなり、セメント添加材の製造（粉砕）に手間がかかる。   In the present invention, the weight of the fired product is 900 to 1200 g / L, preferably 950 to 1150 g / L, particularly preferably 970 to 1130 g / L. When the weight is less than 900 g / L, the strength development property of the cement composition is lowered, and when it exceeds 1200 g / L, the pulverizability of the fired product is deteriorated and it takes time to manufacture (grind) the cement additive.

なお、本発明において、容重とは、図１に示す測定容器（内容積２５０mL）及び漏斗を用い、焼成物を、漏斗を用いて測定容器に充填したときの質量と、測定容器質量から次式により求められるものである。   In the present invention, the capacity means the following formula from the mass when the measurement container (inner volume 250 mL) and the funnel shown in FIG. 1 are used, and the calcined product is filled into the measurement container using the funnel, and the measurement container mass. Is required.

容重値（ｇ／Ｌ）＝（測定質量（ｇ）−容器質量（ｇ））×４．０ Capacity value (g / L) = (measured mass (g) −container mass (g)) × 4.0

より具体的には、測定容器及び漏斗は、図１に示す形状、寸法で、材質と厚さは特に制限されない。
ＪＩＳ Ｚ ８８０１に規定された標準網ふるい９．５mm及び４．７５mm、又はこれらに準ずる板ふるいを用い、焼成物２kgをふるい分け、９．５mmふるいを通過し、４．７５mmふるい残分の粒径の焼成物を試料とする。図２に示すように、測定容器中に挿入された漏斗上に焼成物試料を、すりきりいっぱいまで静かに注ぎ入れる。次に、注意して、静かに漏斗を引き上げる。なお、焼成物が漏斗脚部に詰まり、円滑に流れ落ちない場合は、試料を容器に充填する操作からやり直す。 More specifically, the measurement container and the funnel have the shape and dimensions shown in FIG. 1, and the material and thickness are not particularly limited.
Using standard mesh sieves 9.5 mm and 4.75 mm specified in JIS Z 8801, or plate sieves equivalent to these, screen 2 kg of fired product, pass through 9.5 mm sieve, and particle size of 4.75 mm sieve residue The fired product is used as a sample. As shown in FIG. 2, the fired product sample is gently poured onto the funnel inserted in the measurement container. Then carefully, gently raise the funnel. If the fired product is clogged in the funnel leg and does not flow smoothly, the procedure is repeated from the operation of filling the sample into the container.

漏斗を引き上げた後、容器内の試料の表面は、その突出した部分と窪んだ部分が同じ程度になるよう、指先でならす。試料の充填が終了したら、容器とともにその質量を１ｇ単位まで正確にはかりとり、前記式によって容重値を算出する。なお、容重測定は、原則として２回実施し、その平均を用いるが、２回の測定値の差は２０ｇ／Ｌ以内としなければならない。   After pulling up the funnel, the surface of the sample in the container is leveled with a fingertip so that the protruding portion and the recessed portion are at the same level. When the filling of the sample is completed, the mass of the container is accurately measured to the 1 g unit, and the weight value is calculated by the above formula. In principle, the weight measurement is carried out twice and the average is used, but the difference between the two measurements must be within 20 g / L.

本発明のセメント添加材は、このような焼成物を粉砕してなるものである。焼成物の粉砕物１００質量部に対して、石膏をＳＯ3換算で６質量部以下含有させることもできる。
粉砕方法は特に制限されず、例えばボールミル等を用い、通常の方法で粉砕すれば良い。焼成物の粉砕物は、ブレーン比表面積が２５００〜５０００cm2／ｇであることが、モルタルやコンクリートのブリーディングの低減や、流動性、強度発現性の観点から好ましい。 The cement additive of the present invention is obtained by pulverizing such a fired product. Gypsum can be contained in an amount of 6 parts by mass or less in terms of SO 3 with respect to 100 parts by mass of the pulverized product of the fired product.
The pulverization method is not particularly limited, and may be pulverized by a normal method using, for example, a ball mill. The pulverized product of the fired product preferably has a Blaine specific surface area of 2500 to 5000 cm 2 / g from the viewpoints of reducing bleeding of mortar and concrete, fluidity, and strength development.

本発明のセメント組成物は、前記のような焼成物の粉砕物とセメントを混合することにより得られ、例えば、ポルトランドセメントクリンカー粉砕物１００質量部に対して５〜１００質量部混合することにより、得ることができる。混合量はセメントの種類によって異なるが、例えば普通ポルトランドセメントとして使用する場合は５〜５０質量部、特に１０〜４０質量部混合するのが好ましく、低熱セメントとして使用する場合は５０〜１００質量部、特に６６〜１００質量部混合するのが好ましい。   The cement composition of the present invention is obtained by mixing the pulverized product of the fired product as described above and cement, for example, by mixing 5 to 100 parts by mass with respect to 100 parts by mass of the Portland cement clinker pulverized product, Obtainable. The mixing amount varies depending on the type of cement. For example, when used as ordinary Portland cement, 5 to 50 parts by mass, particularly preferably 10 to 40 parts by mass, and when used as low heat cement, 50 to 100 parts by mass, In particular, it is preferable to mix 66 to 100 parts by mass.

また、本発明のセメント組成物には石膏を配合することができ、セメント中に全ＳＯ3換算で１．５〜５質量％、特に２〜３．５質量％、更に２．５〜３質量％配合するのが、一般的な凝結性状が得られるので好ましい。石膏としては、特に制限されず、例えば二水石膏、α型又はβ型半水石膏、III型無水石膏、II型無水石膏等が挙げられ、これらを単独又は２種以上組み合わせて用いることができる。 Further, the cement composition of the present invention can be formulated gypsum, 1.5-5 weight% in total calculated as SO 3 in the cement, in particular 2 to 3.5% by weight, further 2.5 to 3 mass % Blending is preferable because a general setting property can be obtained. The gypsum is not particularly limited, and examples thereof include dihydrate gypsum, α-type or β-type hemihydrate gypsum, type III anhydrous gypsum, type II anhydrous gypsum, and the like, and these can be used alone or in combination of two or more. .

本発明のセメント組成物は、前記成分等を混合して製造することができるが、その方法は特に制限されず、例えば、ポルトランドセメントクリンカー、焼成物、石膏等の配合成分を、混合した後粉砕するか、あるいは各成分を粉砕した後に混合しても良い。また、焼成物と石膏を粉砕して得られたセメント添加材を、セメントクリンカー粉砕物と混合して製造することもできる。得られるセメント組成物は、ブレーン比表面積が２５００〜４５００cm2／ｇであることが、モルタルやコンクリートのブリーディングの低減や、流動性、強度発現性の観点から好ましい。 The cement composition of the present invention can be produced by mixing the above components, etc., but the method is not particularly limited, and for example, blended components such as Portland cement clinker, fired product, gypsum and the like are pulverized Or you may mix after grind | pulverizing each component. Moreover, the cement additive obtained by grind | pulverizing a baked material and gypsum can also be mixed with a cement clinker ground material, and can also manufacture. The obtained cement composition preferably has a Blaine specific surface area of 2500 to 4500 cm 2 / g from the viewpoints of reduction of bleeding of mortar and concrete, fluidity, and strength development.

次に、実施例を挙げて本発明を更に詳細に説明するが、本発明はこれらにより何ら制限されるものではない。   EXAMPLES Next, although an Example is given and this invention is demonstrated still in detail, this invention is not restrict | limited at all by these.

実施例１
（１）焼成物の製造：
表１に示す化学組成の石灰石、下水汚泥及び廃石膏ボードを原料として、表２に示す容重及びＳＯ3量の焼成物を製造した。焼成は、ロータリーキルンを用い、焼成温度１３５０℃で行なった。なお、焼成物の鉱物組成は、Ｃ2Ｓ：１００質量部に対して、Ｃ2ＡＳ：５１質量部、Ｃ4ＡＦ：３７質量部、Ｃ3Ａ：０質量部、フリーライム：０．６質量部、カルシウムサルホアルミネート：０質量部であった。 Example 1
(1) Production of fired product:
Using the limestone having the chemical composition shown in Table 1, sewage sludge and waste gypsum board as raw materials, the calcined product with the volume and SO 3 amount shown in Table 2 was produced. Firing was performed at a firing temperature of 1350 ° C. using a rotary kiln. The mineral composition of the calcined product is as follows: C 2 S: 100 parts by mass C 2 AS: 51 parts by mass, C 4 AF: 37 parts by mass, C 3 A: 0 parts by mass, free lime: 0.6 Part by mass, calcium sulfoaluminate: 0 part by mass.

Figure 2008037685
Figure 2008037685

Figure 2008037685
Figure 2008037685

（２）焼成物の粉砕性の評価：
焼成物を約５kg用意する。これを、下部間隔約１０mmに調整した大型ジョークラッシャで粉砕する。粉砕した焼成物を、目開き９．５２mmのふるいにかけ、ふるい上の試料に対し、更に下部間隔約３mmに調整した小型ジョークラッシャで粉砕する。得られたふるい通過分と小型ジョークラッシャで粉砕した試料を混ぜ合わせ、４．０kg秤量する。秤量した試料を、粉砕助剤のジエチレングリコール１．８mLとともにボールミルに加え、７０rpmで５００回転した後、５０回転で払出をする。得られた粉砕物の０．６mm通過分（質量％）を測定した。結果を表３に示す。 (2) Evaluation of grindability of fired product:
Prepare about 5kg of fired product. This is crushed with a large jaw crusher adjusted to a lower interval of about 10 mm. The pulverized fired product is passed through a sieve with an opening of 9.52 mm, and the sample on the sieve is further crushed with a small jaw crusher adjusted to a lower interval of about 3 mm. The obtained sieve passage and the sample crushed with a small jaw crusher are mixed and weighed 4.0 kg. The weighed sample is added to a ball mill together with 1.8 mL of a grinding aid diethylene glycol, and after 500 revolutions at 70 rpm, it is dispensed at 50 revolutions. The 0.6 mm passage (mass%) of the obtained pulverized product was measured. The results are shown in Table 3.

Figure 2008037685
Figure 2008037685

表３の結果より、容重が１２００ｇ／Ｌ以下の焼成物は、被粉砕性が良好であることがわかる。   From the results in Table 3, it can be seen that the fired product having a weight of 1200 g / L or less has good grindability.

（３）セメント組成物の製造：
表２のNo.５、No.８又はNo.１１の焼成物、普通ポルトランドセメントクリンカー（Ｃ3Ｓ：１００質量部、Ｃ2Ｓ：２５質量部、Ｃ4ＡＦ：１４質量部、Ｃ3Ａ：１６質量部）、石膏（排脱二水石膏、住友金属社製）を用い、これらを表４に示す割合で混合し、バッチ式ボールミルでブレーン比表面積が３２５０±５０cm2／ｇとなるように同時粉砕して、セメント組成物を製造した。
得られたセメント組成物について、水和熱、モルタルフロー及びモルタル圧縮強さを評価した。結果を表４に併せて示す。 (3) Production of cement composition:
No. 5, No. 8 or No. 11 calcined products in Table 2, ordinary Portland cement clinker (C 3 S: 100 parts by mass, C 2 S: 25 parts by mass, C 4 AF: 14 parts by mass, C 3 A 16 parts by mass) and gypsum (extruded dihydrate gypsum, manufactured by Sumitomo Metals) were mixed at a ratio shown in Table 4 so that the brain specific surface area would be 3250 ± 50 cm 2 / g using a batch-type ball mill. Were simultaneously pulverized to produce a cement composition.
About the obtained cement composition, the heat of hydration, the mortar flow, and the mortar compressive strength were evaluated. The results are also shown in Table 4.

（評価方法）
（１）水和熱：
ＪＩＳ Ｒ ５２０３に従って測定した。
（２）モルタルフロー：
Ｗ／Ｃ＝０．３５、Ｓ／Ｃ＝２、セメント組成物に対して０．８質量％のポリカルボン酸系高性能ＡＥ減水剤を混合したものを、５分間混練したモルタルについて、ＪＩＳ Ｒ ５２０１−１９９７に規定されているフローコーンを用い、ＪＩＳ Ｒ ５２０１に従って、モルタルフローを測定した。
（３）モルタル圧縮強さ：
７日及び２８日後のモルタル圧縮強さを、ＪＩＳ Ｒ ５２０１に従って測定した。 (Evaluation methods)
(1) Heat of hydration:
Measured according to JIS R 5203.
(2) Mortar flow:
W / C = 0.35, S / C = 2, 0.8% by mass of a polycarboxylic acid-based high-performance AE water reducing agent mixed with the cement composition was mixed with JIS R for 5 minutes. Mortar flow was measured in accordance with JIS R 5201 using a flow cone defined in 5201-1997.
(3) Mortar compressive strength:
The mortar compressive strength after 7 and 28 days was measured according to JIS R 5201.

Figure 2008037685
Figure 2008037685

表４の結果より、本発明のセメント添加剤を含むセメント組成物では、水和熱が低く、かつ流動性が良好であることが分かる。これに対し、容重が低い（８００ｇ／Ｌ）焼成物No.11から製造したセメント添加材を用いたセメント組成物では、強度発現性が低かった。   From the results of Table 4, it can be seen that the cement composition containing the cement additive of the present invention has a low heat of hydration and good fluidity. On the other hand, in the cement composition using the cement additive manufactured from the calcined product No. 11 having a low weight (800 g / L), strength development was low.

本発明において、容重を測定する際に用いる測定容器及び漏斗の形状及び寸法を示す図である。In this invention, it is a figure which shows the shape and dimension of a measurement container and funnel used when measuring a capacity | capacitance. 本発明において、容重を測定する際、測定容器中に挿入された漏斗上に、焼成物を充填した状態を示す図である。In this invention, when measuring volume, it is a figure which shows the state with which the baked material was filled on the funnel inserted in the measurement container.

Claims (5)

２ＣａＯ・ＳｉＯ2及び２ＣａＯ・Ａｌ2Ｏ3・ＳｉＯ2を含有し、２ＣａＯ・ＳｉＯ2 １００質量部に対して、２ＣａＯ・Ａｌ2Ｏ3・ＳｉＯ2＋４ＣａＯ・Ａｌ2Ｏ3・Ｆｅ2Ｏ3が１０〜１００質量部であり、３ＣａＯ・Ａｌ2Ｏ3の含有量が２０質量部以下で、かつ、容重が９００〜１２００ｇ／Ｌである焼成物を粉砕してなるセメント添加材。 Containing 2CaO · SiO 2 and 2CaO · Al 2 O 3 · SiO 2, relative to 2CaO · SiO 2 100 parts by weight, 2CaO · Al 2 O 3 · SiO 2 + 4CaO · Al 2 O 3 · Fe 2 O 3 A cement additive obtained by pulverizing a fired product having a content of 10 to 100 parts by mass, a content of 3CaO · Al 2 O 3 of 20 parts by mass or less, and a weight of 900 to 1200 g / L. 焼成物中のＳＯ3量が０．５〜３質量％である請求項１記載のセメント添加材。 The cement additive according to claim 1, wherein the amount of SO 3 in the fired product is 0.5 to 3% by mass. 焼成物の粉砕物１００質量部に対して、石膏をＳＯ3換算で６質量部以下含有する請求項１又は２記載のセメント添加材。 The cement additive according to claim 1 or 2, comprising 6 parts by mass or less of gypsum in terms of SO 3 with respect to 100 parts by mass of the pulverized product of the fired product. 焼成物が、産業廃棄物、一般廃棄物及び建設発生土から選ばれる１種以上を原料とする請求項１〜３のいずれか１項記載のセメント添加材。   The cement additive according to any one of claims 1 to 3, wherein the fired product is made of at least one selected from industrial waste, general waste, and construction generated soil. セメントと、請求項１〜４のいずれか１項記載のセメント添加材を含有するセメント組成物。   The cement composition containing a cement and the cement additive of any one of Claims 1-4.
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JP2009184895A (en) * 2008-02-08 2009-08-20 Taiheiyo Cement Corp Cement additive and cement composition
JP2010120798A (en) * 2008-11-18 2010-06-03 Taiheiyo Cement Corp Cement composition
JP2011063460A (en) * 2009-09-15 2011-03-31 Taiheiyo Cement Corp Cement additive and cement composition
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JP5186610B1 (en) * 2012-05-23 2013-04-17 太平洋セメント株式会社 Fired product
JP2013253006A (en) * 2012-06-08 2013-12-19 Taiheiyo Cement Corp Method for reducing elution amount of hexavalent chromium from fired material, and method for producing fired material

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* Cited by examiner, † Cited by third party
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JP2009184895A (en) * 2008-02-08 2009-08-20 Taiheiyo Cement Corp Cement additive and cement composition
JP2010120798A (en) * 2008-11-18 2010-06-03 Taiheiyo Cement Corp Cement composition
JP2011063460A (en) * 2009-09-15 2011-03-31 Taiheiyo Cement Corp Cement additive and cement composition
JP2012020914A (en) * 2010-07-16 2012-02-02 Taiheiyo Cement Corp Cement additive and cement composition
JP5186610B1 (en) * 2012-05-23 2013-04-17 太平洋セメント株式会社 Fired product
JP2014001127A (en) * 2012-05-23 2014-01-09 Taiheiyo Cement Corp Construction material composition and method for reducing amount of fluorine elution in the same
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