JP5555980B2 - Cement admixture - Google Patents
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- JP5555980B2 JP5555980B2 JP2008079472A JP2008079472A JP5555980B2 JP 5555980 B2 JP5555980 B2 JP 5555980B2 JP 2008079472 A JP2008079472 A JP 2008079472A JP 2008079472 A JP2008079472 A JP 2008079472A JP 5555980 B2 JP5555980 B2 JP 5555980B2
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- 239000004568 cement Substances 0.000 title claims description 51
- 239000003513 alkali Substances 0.000 claims description 40
- 239000002689 soil Substances 0.000 claims description 39
- 238000010276 construction Methods 0.000 claims description 32
- 239000002994 raw material Substances 0.000 claims description 26
- 235000019738 Limestone Nutrition 0.000 claims description 19
- 239000006028 limestone Substances 0.000 claims description 19
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 16
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 14
- 239000010440 gypsum Substances 0.000 claims description 14
- 229910052602 gypsum Inorganic materials 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 8
- 150000004683 dihydrates Chemical class 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- 238000010304 firing Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 8
- 239000000126 substance Substances 0.000 description 5
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 229910001678 gehlenite Inorganic materials 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
- 238000009614 chemical analysis method Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
Images
Classifications
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/023—Fired or melted materials
-
- 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
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/34—Flow improvers
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
本発明は、アルカリの多い建設発生土を使用し、水溶性アルカリが存在する流動性が良好なセメント混和材に関するものである。 The present invention relates to a cement admixture that uses construction-generated soil with a large amount of alkali and has good fluidity in which water-soluble alkali exists.
従来より、産業廃棄物、一般廃棄物を原料としたゲーレナイト系クリンカー混和材の開発が行われている。例えば、建設発生土を使用して、C2SとC2ASを必須成分とし、C2S100質量部に対して、C2AS＋C4AFを10〜100質量部含有し、かつ、C3Aの含有量が20質量部以下であるセメント混和材を製造し、添加することで、セメントの水和熱が低下し、流動性が向上するという技術が開示されている（例えば、特許文献1、2等）。
本発明者等は、上記課題を解決するために鋭意検討した結果、処理に苦慮しているアルカリ含有量の多い建設発生土を積極的に原料として使用するとともに、SO3量をコントロールすることにより、上記課題を解決することを見出し、本発明を完成するに至った。
即ち、本発明は、Ｃ２ＡＳと、ＣＳと、水溶性アルカリ０.３０〜０.５８質量％と、ＳＯ３０.４０〜０．８３質量％とを含有し、Insol.含有量が１１．７６〜１２．２３質量％、SiO 2 含有量が３５．７９〜３６．３７質量％、Al ２ O 3 含有量が８．７３〜８．７８質量％、Fe 2 O 3 含有量が２．２６〜２．２９質量％、CaO含有量が３６．２８〜３６．６７質量％、Na 2 O含有量が１．４８〜１．５１質量％及びK 2 O含有量が０．８８〜０．９７質量％であるセメント混和材であり、かつ、アルカリ含有量が５〜８質量％の建設発生土と、石灰石と、二水石膏とからなる原料を、前記建設発生土の原料原単位がセメント混和材１ｔ当たり６４２〜６４５ｋｇで、前記建設発生土と前記石灰石の使用比率が、ＣａＯ-ＳｉＯ２-Ａｌ２Ｏ３の３成分の和を１００質量％として算出した場合の質量比で４．５〜６．５：３．５〜５．５となるように調合し、１０００〜１２５０℃で焼成して得られたセメント混和材に関する。
また、本発明は、上記のセメント混和材の粉砕物２〜６０質量％と、ポルトランドセメント４０〜９８質量％とを含有するセメント組成物に関する。
また、本発明は、建設発生土のアルカリ含有量を５〜８質量％に調整する工程と、前記建設発生土と、石灰石と、二水石膏とからなる原料を、前記建設発生土の原料原単位がセメント混和材１ｔ当たり６４２〜６４５ｋｇで、前記建設発生土と前記石灰石の使用比率が、ＣａＯ-ＳｉＯ２-Ａｌ２Ｏ３の３成分の和を１００質量％として算出した場合の質量比で４．５〜６．５：３．５〜５．５となるように調合する工程と、前記原料を１０００〜１２５０℃で焼成し、Ｃ２ＡＳと、水溶性アルカリ０.３０〜０.５８質量％と、ＳＯ３０.４０〜０．８３質量％とを含有し、Insol.含有量が１１．７６〜１２．２３質量％、SiO 2 含有量が３５．７９〜３６．３７質量％、Al ２ O 3 含有量が８．７３〜８．７８質量％、Fe 2 O 3 含有量が２．２６〜２．２９質量％、CaO含有量が３６．２８〜３６．６７質量％、Na 2 O含有量が１．４８〜１．５１質量％及びK 2 O含有量が０．８８〜０．９７質量％である、セメント混和材を製造する工程とを含むセメント混和材の製造方法に関する。
また、本発明は、建設発生土のアルカリ含有量を５〜７質量％に調整する工程と、前記建設発生土と、石灰石と、二水石膏とからなる原料を、前記建設発生土の原料原単位がセメント混和材１ｔ当たり６４２〜６４５ｋｇで、前記建設発生土と前記石灰石の使用比率が、ＣａＯ-ＳｉＯ ２ -Ａｌ ２ Ｏ ３ の３成分の和を１００質量％として算出した場合の質量比で４．５〜６．５：３．５〜５．５となるように調合する工程と、前記原料を１０００〜１２５０℃で焼成し、Ｃ ２ ＡＳと、水溶性アルカリ０.３０〜０.５８質量％と、ＳＯ ３ ０.４０〜０．８３質量％とを含有し、Insol.含有量が１１．７６〜１２．２３質量％、SiO 2 含有量が３５．７９〜３６．３７質量％、Al ２ O 3 含有量が８．７３〜８．７８質量％、Fe 2 O 3 含有量が２．２６〜２．２９質量％、CaO含有量が３６．２８〜３６．６７質量％、Na 2 O含有量が１．４８〜１．５１質量％及びK 2 O含有量が０．８８〜０．９７質量％である、セメント混和材を製造する工程と、前記セメント混和材を粉砕し粉砕物を得る工程と、前記粉砕物２〜６０質量％と、ポルトランドセメント４０〜９８質量％とを混合しセメント組成物を得る工程を含むセメント組成物の製造方法に関する。
As a result of intensive studies to solve the above-mentioned problems, the present inventors actively used construction generated soil with a high alkali content, which is difficult to treat, as a raw material, and by controlling the amount of SO3, The present inventors have found that the above problems can be solved and have completed the present invention.
That is, the present invention includes a C 2 AS, and CS, and water-soluble alkali from 0.30 to 0.58 wt%, contains a SO 3 from 0.40 to 0.83 wt%, insol. Content 11 .76-12.23 mass%, SiO 2 content is 35.79-36.37 mass%, Al 2 O 3 content is 8.73-8.78 mass%, Fe 2 O 3 content is 2. 26 to 2.29 mass%, CaO content of 36.28 to 36.67 wt%, Na 2 O content of 1.48 to 1.51 wt% and K 2 O content of 0.88 to 0. A cement admixture of 97% by mass and a raw material consisting of construction-generated soil with an alkali content of 5-8% by mass, limestone, and dihydrate gypsum, and the raw material unit of the construction-generated soil is cement It is 642-645 kg per 1 ton of admixture, and the usage ratio of the construction generated soil and the limestone is the sum of three components of CaO—SiO 2 —Al 2 O 3 It is related with the cement admixture obtained by preparing so that it may become 4.5-6.5: 3.5-5.5 by the mass ratio when calculating as 100 mass%, and baking at 1000-1250 degreeC.
Moreover, this invention relates to the cement composition containing 2-60 mass% of pulverized materials of said cement admixture, and 40-98 mass% of Portland cement.
Further, the present invention provides a raw material comprising the step of adjusting the alkali content of construction generated soil to 5 to 8% by mass, the construction generated soil, limestone, and dihydrate gypsum. The unit is 642 to 645 kg per 1 ton of cement admixture, and the use ratio of the construction generated soil and the limestone is a mass ratio when the sum of three components of CaO—SiO 2 —Al 2 O 3 is calculated as 100 mass%. 4.5 to 6.5: the step of preparing to be 3.5 to 5.5, and the raw material is fired at 1000 to 1250 ° C. to obtain C 2 AS and water-soluble alkali 0.30 to 0.58. wt% and contains a SO 3 from 0.40 to 0.83 wt%, insol. content of 11.76 to 12.23 wt%, SiO 2 content of 35.79 to 36.37 wt%, al 2 O 3 content from 8.73 to 8.78 wt%, Fe 2 O 3 content 2.26～ .29 wt%, CaO content of 36.28 to 36.67 wt%, Na 2 O content of 1.48 to 1.51 wt% and K 2 O content of 0.88 to 0.97 wt% And a process for producing a cement admixture.
In addition, the present invention provides a raw material comprising the step of adjusting the alkali content of the construction-generated soil to 5 to 7% by mass, the construction-generated soil, limestone, and dihydrate gypsum. The unit is 642 to 645 kg per 1 ton of cement admixture, and the use ratio of the construction generated soil and the limestone is a mass ratio when the sum of three components of CaO—SiO 2 —Al 2 O 3 is calculated as 100 mass%. 4.5 to 6.5: the step of preparing to be 3.5 to 5.5, and the raw material is fired at 1000 to 1250 ° C. to obtain C 2 AS and water-soluble alkali 0.30 to 0.58. wt% and contains a SO 3 from 0.40 to 0.83 wt%, insol. content of 11.76 to 12.23 wt%, SiO 2 content of 35.79 to 36.37 wt%, Al 2 O 3 content is 8.73 to 8.78 mass%, Fe 2 O 3 content is 2.26 to 2 .29% by mass, CaO content of 36.28 to 36.67% by mass, Na 2 O content of 1.48 to 1.51% by mass and K 2 O content of 0.88 to 0.97% by mass A cement composition comprising: a step of producing a cement admixture, a step of pulverizing the cement admixture to obtain a pulverized product, 2 to 60% by mass of the pulverized product, and 40 to 98% by mass of Portland cement. It is related with the manufacturing method of the cement composition including the process of obtaining.
本発明者等は、上記課題を解決するために鋭意検討した結果、処理に苦慮しているアルカリ含有量の多い建設発生土を積極的に原料として使用するとともに、SO3量をコントロールすることにより、上記課題を解決することを見出し、本発明を完成するに至った。
即ち、本発明は、Ｃ２ＡＳと、水溶性アルカリ０.１〜０.８質量％と、ＳＯ３０.２〜１.０質量％とを含有するセメント混和材に関する。
また、本発明は、上記のセメント混和材の粉砕物２〜６０質量％と、ポルトランドセメント４０〜９８質量％とを含有するセメント組成物に関する。
また、本発明は、建設発生土のアルカリ含有量を４〜８質量％に調整する工程と、セメント混和材１ｔ当たり４００〜７５０ｋｇの前記建設発生土と、石灰石と、石膏とを混合し原料を調整する工程と、前記原料を１０００〜１２５０℃で焼成し、Ｃ２ＡＳと、水溶性アルカリ０.１〜０.８質量％と、ＳＯ３０.２〜１.０質量％とを含有するセメント混和材を製造する工程とを含むセメント混和材の製造方法に関する。
As a result of intensive studies to solve the above problems, the present inventors actively used construction generated soil with a high alkali content, which is difficult to treat, as a raw material, and by controlling the amount of SO 3 The present inventors have found that the above problems can be solved and have completed the present invention.
That is, the present invention includes a C 2 AS, a water-soluble alkali 0.1-0.8 wt%, about cement admixture containing a SO 3 0.2 to 1.0% by weight.
Moreover, this invention relates to the cement composition containing 2-60 mass% of pulverized materials of said cement admixture, and 40-98 mass% of Portland cement.
Moreover, this invention mixes the process of adjusting the alkali content of construction generation soil to 4-8 mass%, 400-750 kg of said construction generation soil per 1 ton of cement admixtures, limestone, and gypsum. The adjusting step, the raw material is fired at 1000 to 1250 ° C., and contains C 2 AS, water-soluble alkali 0.1 to 0.8 mass%, and SO 3 0.2 to 1.0 mass%. The manufacturing method of a cement admixture including the process of manufacturing a cement admixture.
本発明のセメント混和材は、処理に苦慮しているアルカリ含有量の多い建設発生土を多量に使用でき、水溶性アルカリが存在することで流動性付与機能を備えており、セメントに混和材として使用した場合、従来のゲーレナイト系クリンカーよりもさらに流動性に優れる。 The cement admixture of the present invention can use a large amount of construction generated soil with a high alkali content, which is difficult to treat, and has a fluidity imparting function due to the presence of water-soluble alkali. When used, it is more excellent in fluidity than the conventional gehlenite clinker.
以下、本発明に係るセメント混和材の好適な実施形態について詳細に説明する。 Hereinafter, preferred embodiments of the cement admixture according to the present invention will be described in detail.
本発明のセメント混和材は、Ｃ２ＡＳと、水溶性アルカリと、ＳＯ３を含有する。Ｃ２ＡＳは化学構造式が２ＣａＯ・Ａｌ２Ｏ３・ＳｉＯ２で表され、一般にゲーレナイトといわれるものである。その他の成分としては、ＣＳを含むことが好ましい。Ｃ２ＡＳの好ましい含有量は７〜５０質量％である。ＣＳは化学構造式がＣａＯ・ＳｉＯ２で表され、一般にワラストナイトといわれるものである。 The cement admixture of the present invention contains C 2 AS, a water-soluble alkali, and SO 3 . The chemical structural formula of C 2 AS is represented by 2CaO · Al 2 O 3 · SiO 2 and is generally called gehlenite. Other components preferably include CS. The preferable content of C 2 AS is 7 to 50% by mass. CS has a chemical structural formula represented by CaO.SiO 2 and is generally called wollastonite.
水溶性アルカリの含有量は0.1〜0.8質量%、好ましくは、0.3〜0.6質量%である。0.1質量%未満では、水溶性アルカリ量が流動性向上へ及ぼす影響が小さい。0.8質量%より多ければ、分散効果が低下し、粘度が増大し、流動性が低下する。 The content of the water-soluble alkali is 0.1 to 0.8% by mass, preferably 0.3 to 0.6% by mass. If it is less than 0.1% by mass, the influence of the water-soluble alkali amount on the improvement of fluidity is small. If it is more than 0.8% by mass, the dispersion effect is lowered, the viscosity is increased and the fluidity is lowered.
SO3の含有量は0.2〜1.0質量%、好ましくは、0.4〜0.8質量%である。0.2質量%未満では、水溶性アルカリが充分生成しなくなり流動性向上効果が小さくなる。1.0質量%より多ければ、水溶性アルカリが過剰となり、逆に流動性が低下する。 The content of SO 3 is 0.2 to 1.0% by mass, preferably 0.4 to 0.8% by mass. If it is less than 0.2% by mass, sufficient water-soluble alkali is not produced and the effect of improving fluidity is reduced. If it is more than 1.0% by mass, the water-soluble alkali becomes excessive, and conversely, the fluidity decreases.
本発明のセメント混和材は、建設発生土を原料とし、建設発生土に含まれるアルカリ（Ｎａ２Oeq.）量は４〜８質量%、好ましくは５〜７質量%である。４質量%未満では混和材中に水溶性アルカリが充分存在しなくなる場合がある。また、８質量%を超えると水溶性アルカリ量が過剰となり、逆に流動性が低下する場合がある。建設発生土に含まれるアルカリ量を４〜８質量%に調整する方法としては、アルカリ量が４〜８質量%である建設発生土を使用する方法や、種々のアルカリ量を示す建設発生土を適時混合し建設発生土の総量中のアルカリ量を４〜８質量%に調整する方法の何れでも良い。また、下記の石灰石や石膏を使用する場合は、建設発生土単独でなく、原料の総量中のアルカリ量を４〜８質量%に調整する方法でも良い。 The cement admixture of the present invention uses construction generated soil as a raw material, and the amount of alkali (Na 2 Oeq.) Contained in the construction generated soil is 4 to 8% by mass, preferably 5 to 7% by mass. If it is less than 4% by mass, the water-soluble alkali may not be sufficiently present in the admixture. On the other hand, if it exceeds 8% by mass, the amount of water-soluble alkali becomes excessive, and the fluidity may decrease. As a method of adjusting the amount of alkali contained in construction generated soil to 4 to 8% by mass, a method using construction generated soil having an alkali amount of 4 to 8% by mass or construction generated soil exhibiting various alkali amounts is used. Any method may be used in which the alkali amount in the total amount of construction generated soil is adjusted to 4 to 8% by mass by mixing timely. Moreover, when using the following limestone and gypsum, the method of adjusting the alkali amount in the total amount of a raw material to 4-8 mass% may be sufficient instead of construction generation | occurrence | production soil alone.
セメント混和材１ｔ当たりの建設発生土の原料原単位は４００〜７５０ｋｇ、好ましくは、５５０〜７００ｋｇである。４００〜７５０ｋｇの範囲であれば、Ｃ２ＡＳが充分に生成する。
また、Ｃａ原料として石灰石、ＳＯ３原料として硫酸カルシウムを必要に応じて使用する。セメント混和材１ｔ当たりの石灰石の原料原単位は４００〜７５０ｋｇ、好ましくは、５５０〜７００ｋｇである。硫酸カルシウムとしては無水石膏、二水石膏、半水石膏の何れの形態でも良く、その種類としては天然石膏、排煙脱硫石膏、フッ酸石膏、中和石膏、石膏ボードの廃材等がある。セメント混和材１ｔ当たりの硫酸カルシウムの原料原単位は５〜４０kg、好ましくは、７〜３０ｋｇである。また、建設発生土と石灰石の使用比率は、４〜７：３〜６、好ましくは４．５〜６．５：３．５〜５．５である（CaO−SiO2−Al2O3の３成分の和を１００質量％とし算出した場合の質量比）。上記範囲であれば、Ｃ２ＡＳが充分に生成し、水溶性アルカリも適量生成する。
The raw material basic unit of construction generated soil per 1 ton of cement admixture is 400 to 750 kg, preferably 550 to 700 kg. Be in the range of 400~750kg, C 2 AS is sufficiently generated.
Further, limestone is used as a Ca raw material, and calcium sulfate is used as a SO 3 raw material as required. The raw material basic unit of limestone per 1 ton of cement admixture is 400 to 750 kg, preferably 550 to 700 kg. Calcium sulfate may be in any form of anhydrous gypsum, dihydrate gypsum, and hemihydrate gypsum, and types thereof include natural gypsum, flue gas desulfurization gypsum, hydrofluoric acid gypsum, neutralized gypsum, and gypsum board waste. The raw material basic unit of calcium sulfate per 1 ton of cement admixture is 5 to 40 kg, preferably 7 to 30 kg. Moreover, the use ratio of construction generated soil and limestone is 4-7: 3-6, preferably 4.5-6.5: 3.5-5.5 (CaO—SiO 2 —Al 2 O 3 (Mass ratio in the case of calculating the sum of the three components as 100% by mass). If the above-mentioned range, C 2 AS is sufficiently produced, also an appropriate amount produced water-soluble alkali.
セメント混和材の焼成温度は1000〜1250℃、好ましくは1100〜1200℃である。1000℃未満では、本発明の焼成物が得られない場合があり、1250℃より高ければ、クリンカーの液相が生成され過ぎ、キルン内にコーチングを多量に生成しキルンの閉塞が生じる恐れがある。焼成に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。ロータリーキルンで焼成する際には、燃料代替廃棄物を使用することができる。 The firing temperature of the cement admixture is 1000 to 1250 ° C, preferably 1100 to 1200 ° C. If the temperature is lower than 1000 ° C., the fired product of the present invention may not be obtained. If the temperature is higher than 1250 ° C., a liquid phase of the clinker is excessively generated, and a large amount of coating may be generated in the kiln, resulting in clogging of the kiln. . The apparatus used for baking is not specifically limited, For example, a rotary kiln etc. can be used. When firing in a rotary kiln, fuel alternative waste can be used.
焼成して得られたセメント混和材は、チューブミル、振動ミル、竪型ミル等の一般的ミルを使用し、ブレーン比表面積で２０００〜７０００ｃｍ２/ｇ、好ましくは２５００〜４０００ｃｍ２/ｇ程度に粉砕する。
粉砕物はセメントに混合して使用する。使用割合は、粉砕物２〜６０質量％、好ましくは２０〜４０質量％に対して、ポルトランドセメント４０〜９８質量％、好ましくは５０〜７０質量％である。
セメント混和材の粉砕物が２質量％未満では、水溶性アルカリ量が少なく、流動性が向上しない。また、アルカリを含んだ建設発生土の処理量が十分に行なえない。６０質量％より多ければ、強度が低下する。また、水溶性アルカリが過剰となり、逆に流動性が低下する。
The cement admixture obtained by firing uses a general mill such as a tube mill, a vibration mill, or a vertical mill, and has a brain specific surface area of 2000 to 7000 cm 2 / g, preferably about 2500 to 4000 cm 2 / g. Smash.
The pulverized product is used by mixing with cement. The ratio of use is 2 to 60% by mass, preferably 20 to 40% by mass, and 40 to 98% by mass, preferably 50 to 70% by mass, of Portland cement with respect to the pulverized product.
When the cement admixture is less than 2% by mass, the amount of water-soluble alkali is small and the fluidity is not improved. In addition, the amount of construction soil containing alkali cannot be treated sufficiently. If it is more than 60% by mass, the strength decreases. Further, the water-soluble alkali becomes excessive, and conversely, the fluidity is lowered.
以下に、実施例を用いて本発明を詳細に説明するが、本発明はこれらの実施例に限定されるものではない。 EXAMPLES The present invention will be described in detail below using examples, but the present invention is not limited to these examples.
[１．供試試料の調製]
表1に示す化学組成の石灰石および建設発生土を用いて、建設発生土：石灰石＝6：4（CaO−SiO2−Al2O3の３成分の和を１００質量％とし算出した場合の質量比）となるよう調合した。SO3量は、試薬の硫酸カルシウム二水和物を用いて0〜0.8質量%となるよう調製した。表２に調合した際の原料原単位を示す。
[1. Preparation of test sample]
With limestone and construction generating soil chemical compositions shown in Table 1, construction soil generated: limestone = 6: 4 (mass when the sum of the three components of CaO-SiO 2 -Al 2 O 3 was calculated as 100 wt% Ratio). The amount of SO 3 was adjusted to 0 to 0.8% by mass using the calcium sulfate dihydrate reagent. Table 2 shows raw material basic units when blended.
この混合物を1200℃で30分間焼成し、遊星ミルでブレーン比表面積3300cm２/gに粉砕した。得られた焼成物の化学組成を表３に示す。
なお、表１及び表３の化学組成はＪＩＳ Ｒ５２０２：１９９９「ポルトランドセメントの化学分析方法」により測定した。また、表３の水溶性アルカリ（水溶性Ｎａ２Ｏeq.）量は、JCAS I-04：2004「セメントの水溶性成分の分析方法」により測定した。また、粉砕物はＸ線回折装置により同定を行なった。使用したＸ線回折装置は理学電気（株）製ＲＩＮＴ−２５００Ｖを用いた。Ｘ線回折装置における測定条件は次の通りとした。
管球：Cu、管電流：１１０ｍＡ、管電圧：３５ｋV、サンプリング幅：０．０２°、走査速度：４°／ｍｉｎ、波長：１．５４０５Å、測定回折角範囲（２θ）：５°〜７０°
This mixture was calcined at 1200 ° C. for 30 minutes, and pulverized to a Blaine specific surface area of 3300 cm 2 / g by a planetary mill. Table 3 shows the chemical composition of the obtained fired product.
In addition, the chemical composition of Table 1 and Table 3 was measured by JIS R5202: 1999 "Chemical analysis method of Portland cement". The amount of water-soluble alkali (water-soluble Na 2 Oeq.) In Table 3 was measured by JCAS I-04: 2004 “Analytical method for water-soluble components of cement”. The pulverized product was identified by an X-ray diffractometer. The X-ray diffractometer used was RINT-2500V manufactured by Rigaku Corporation. The measurement conditions in the X-ray diffractometer were as follows.
Tube: Cu, tube current: 110 mA, tube voltage: 35 kV, sampling width: 0.02 °, scanning speed: 4 ° / min, wavelength: 1.5405 mm, measurement diffraction angle range (2θ): 5 ° to 70 °
図１に示すように、ＣＳとＣ２ＡＳのピークが明確に確認出来た。また、２θ＝３３.２°に現れるＣ３Ａのピークは存在せず、ナフタレン系やポリカルボン酸系減水剤を吸着し難い焼結物が得られていることが分かる。
この粉砕物３０質量％を普通ポルトランドセメント（宇部三菱セメント（株）製；ブレーン比表面積3310cm2/g）70質量％に添加し、混合して供試試料とした。
As shown in FIG. 1, the peaks of CS and C 2 AS were clearly confirmed. Further, it can be seen that a C 3 A peak appearing at 2θ = 33.2 ° does not exist, and a sintered product that hardly adsorbs a naphthalene-based or polycarboxylic acid-based water reducing agent is obtained.
30% by mass of this pulverized product was added to 70% by mass of ordinary Portland cement (manufactured by Ube Mitsubishi Cement Co., Ltd .; Blaine specific surface area 3310 cm 2 / g) and mixed to prepare a test sample.
[２．流動性の評価試験]
水セメント比を35%、ナフタレン系高性能減水剤（第一工業製薬（株）製、セルフロー１２０）の添加量を0.85質量%としてセメントペーストを調合し、120秒間高速攪拌した。得られたセメントペーストについて、JASS15M−103「セルフレベリング材の品質基準」の流動性試験に基づき、セメントペーストフロー値を測定して評価した。結果を表４に示す。実施例1および2では、比較例1に比べて水溶性アルカリ量増大にともない、ペーストフローが増大し、良好な流動性が得られている。
[2. Fluidity evaluation test]
A cement paste was prepared with a water-cement ratio of 35% and a naphthalene-based high-performance water reducing agent (Daily Kogyo Seiyaku Co., Ltd., Cellflow 120) added in an amount of 0.85% by mass, and stirred at high speed for 120 seconds. About the obtained cement paste, based on the fluidity | liquidity test of JASS15M-103 "quality standard of a self-leveling material", the cement paste flow value was measured and evaluated. The results are shown in Table 4. In Examples 1 and 2, the paste flow increased and good fluidity was obtained with an increase in the amount of water-soluble alkali as compared with Comparative Example 1.
Claims (4)
アルカリ含有量が５〜７質量％の建設発生土と、石灰石と、二水石膏とからなる原料を、
前記建設発生土の原料原単位がセメント混和材１ｔ当たり６４２〜６４５ｋｇで、
前記建設発生土と前記石灰石の使用比率が、ＣａＯ-ＳｉＯ２-Ａｌ２Ｏ３の３成分の和を１００質量％として算出した場合の質量比で４．５〜６．５：３．５〜５．５となるように調合し、
１０００〜１２５０℃で焼成して得られたことを特徴とするセメント混和材。 It contains C 2 AS, CS, water-soluble alkali 0.30 to 0.58 mass%, SO 3 0.40 to 0.83 mass%, and Insol. Content of 11.76 to 12.23. % By mass, SiO 2 content 35.79-36.37% by mass, Al 2 O 3 content 8.73-8.78% by mass, Fe 2 O 3 content 2.26-2.29% by mass %, CaO content of 36.28 to 36.67% by mass, Na 2 O content of 1.48 to 1.51% by mass and K 2 O content of 0.88 to 0.97% by mass An admixture, and
A raw material consisting of construction generated soil having an alkali content of 5 to 7% by mass, limestone, and dihydrate gypsum,
The raw material unit of the construction generated soil is 642 to 645 kg per ton of cement admixture,
The use ratio of the construction generated soil and the limestone is 4.5 to 6.5: 3.5 to 3.5 to 3.5 in terms of a mass ratio when the sum of three components of CaO—SiO 2 —Al 2 O 3 is calculated as 100 mass%. So that it ’s 5.5.
A cement admixture obtained by firing at 1000 to 1250 ° C.
前記建設発生土と、石灰石と、二水石膏とからなる原料を、
前記建設発生土の原料原単位がセメント混和材１ｔ当たり６４２〜６４５ｋｇで、
前記建設発生土と前記石灰石の使用比率が、ＣａＯ-ＳｉＯ２-Ａｌ２Ｏ３の３成分の和を１００質量％として算出した場合の質量比で４．５〜６．５：３．５〜５．５となるように調合する工程と、
前記原料を１０００〜１２５０℃で焼成し、
Ｃ２ＡＳと、水溶性アルカリ０.３０〜０.５８質量％と、ＳＯ３０.４０〜０．８３質量％とを含有し、Insol.含有量が１１．７６〜１２．２３質量％、SiO 2 含有量が３５．７９〜３６．３７質量％、Al ２ O 3 含有量が８．７３〜８．７８質量％、Fe 2 O 3 含有量が２．２６〜２．２９質量％、CaO含有量が３６．２８〜３６．６７質量％、Na 2 O含有量が１．４８〜１．５１質量％及びK 2 O含有量が０．８８〜０．９７質量％である、セメント混和材を製造する工程とを含むことを特徴とするセメント混和材の製造方法。 Adjusting the alkali content of the construction soil to 5-7% by mass;
A raw material consisting of the construction-generated soil, limestone, and dihydrate gypsum,
The raw material unit of the construction generated soil is 642 to 645 kg per ton of cement admixture,
The use ratio of the construction generated soil and the limestone is 4.5 to 6.5: 3.5 to 3.5 to 3.5 in terms of a mass ratio when the sum of three components of CaO—SiO 2 —Al 2 O 3 is calculated as 100 mass%. A step of blending to be 5.5;
The raw material is fired at 1000 to 1250 ° C.,
Containing C 2 AS, water-soluble alkali 0.30 to 0.58 mass%, SO 3 0.40 to 0.83 mass%, Insol. Content 11.76 to 12.23 mass%, SiO 2 content is 35.79 to 36.37% by mass, Al 2 O 3 content is 8.73 to 8.78% by mass, Fe 2 O 3 content is 2.26 to 2.29% by mass, CaO content of 36.28 to 36.67 wt%, Na 2 O content of 1.48 to 1.51 wt% and K 2 O content of 0.88 to 0.97 wt%, a cement admixture A method for producing a cement admixture, comprising the step of:
前記建設発生土と、石灰石と、二水石膏とからなる原料を、
前記建設発生土の原料原単位がセメント混和材１ｔ当たり６４２〜６４５ｋｇで、
前記建設発生土と前記石灰石の使用比率が、ＣａＯ-ＳｉＯ ２ -Ａｌ ２ Ｏ ３ の３成分の和を１００質量％として算出した場合の質量比で４．５〜６．５：３．５〜５．５となるように調合する工程と、
前記原料を１０００〜１２５０℃で焼成し、
Ｃ ２ ＡＳと、水溶性アルカリ０.３０〜０.５８質量％と、ＳＯ ３ ０.４０〜０．８３質量％とを含有し、Insol.含有量が１１．７６〜１２．２３質量％、SiO 2 含有量が３５．７９〜３６．３７質量％、Al ２ O 3 含有量が８．７３〜８．７８質量％、Fe 2 O 3 含有量が２．２６〜２．２９質量％、CaO含有量が３６．２８〜３６．６７質量％、Na 2 O含有量が１．４８〜１．５１質量％及びK 2 O含有量が０．８８〜０．９７質量％である、セメント混和材を製造する工程と、
前記セメント混和材を粉砕し粉砕物を得る工程と、
前記粉砕物２〜６０質量％と、ポルトランドセメント４０〜９８質量％とを混合しセメント組成物を得る工程を含むことを特徴とするセメント組成物の製造方法。 Adjusting the alkali content of the construction soil to 5-7% by mass;
A raw material consisting of the construction-generated soil, limestone, and dihydrate gypsum,
The raw material unit of the construction generated soil is 642 to 645 kg per ton of cement admixture,
The use ratio of the construction generated soil and the limestone is 4.5 to 6.5: 3.5 to 3.5 to 3.5 in terms of a mass ratio when the sum of three components of CaO—SiO 2 —Al 2 O 3 is calculated as 100 mass%. A step of blending to be 5.5;
The raw material is fired at 1000 to 1250 ° C.,
Containing C 2 AS, water-soluble alkali 0.30 to 0.58 mass%, SO 3 0.40 to 0.83 mass%, Insol. Content 11.76 to 12.23 mass%, SiO 2 content is 35.79 to 36.37% by mass, Al 2 O 3 content is 8.73 to 8.78% by mass, Fe 2 O 3 content is 2.26 to 2.29% by mass, CaO content of 36.28 to 36.67 wt%, Na 2 O content of 1.48 to 1.51 wt% and K 2 O content of 0.88 to 0.97 wt%, a cement admixture Manufacturing process,
Crushing the cement admixture to obtain a pulverized product;
The manufacturing method of the cement composition characterized by including the process of mixing the said pulverized material 2-60 mass% and 40-98 mass% of Portland cement, and obtaining a cement composition .
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