JP2009249228A - Ultralow-shrinkage ae concrete composition - Google Patents
Ultralow-shrinkage ae concrete composition Download PDFInfo
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- JP2009249228A JP2009249228A JP2008099097A JP2008099097A JP2009249228A JP 2009249228 A JP2009249228 A JP 2009249228A JP 2008099097 A JP2008099097 A JP 2008099097A JP 2008099097 A JP2008099097 A JP 2008099097A JP 2009249228 A JP2009249228 A JP 2009249228A
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- 239000000203 mixture Substances 0.000 title claims abstract description 60
- 239000004568 cement Substances 0.000 claims abstract description 59
- 238000001035 drying Methods 0.000 claims abstract description 42
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 34
- 239000010440 gypsum Substances 0.000 claims abstract description 32
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 32
- 239000002270 dispersing agent Substances 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- -1 alkylene glycol monoalkyl ether Chemical class 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 235000019738 Limestone Nutrition 0.000 claims abstract description 10
- 239000006028 limestone Substances 0.000 claims abstract description 10
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 6
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims abstract description 6
- WRKCIHRWQZQBOL-UHFFFAOYSA-N octyl dihydrogen phosphate Chemical group CCCCCCCCOP(O)(O)=O WRKCIHRWQZQBOL-UHFFFAOYSA-N 0.000 claims description 25
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 17
- 239000011398 Portland cement Substances 0.000 claims description 11
- 229940028356 diethylene glycol monobutyl ether Drugs 0.000 claims description 10
- JCGNDDUYTRNOFT-UHFFFAOYSA-N oxolane-2,4-dione Chemical group O=C1COC(=O)C1 JCGNDDUYTRNOFT-UHFFFAOYSA-N 0.000 claims description 10
- 125000004432 carbon atom Chemical group C* 0.000 claims description 8
- 150000004683 dihydrates Chemical group 0.000 claims description 8
- 125000006353 oxyethylene group Chemical group 0.000 claims description 8
- 125000000217 alkyl group Chemical group 0.000 claims description 6
- 229910052783 alkali metal Inorganic materials 0.000 claims description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 4
- 150000001340 alkali metals Chemical class 0.000 claims description 3
- 150000001412 amines Chemical class 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 2
- 125000005702 oxyalkylene group Chemical group 0.000 claims description 2
- 229920005646 polycarboxylate Polymers 0.000 claims description 2
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical group CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims 1
- 239000011505 plaster Substances 0.000 claims 1
- 230000002411 adverse Effects 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 abstract description 2
- 239000004575 stone Substances 0.000 description 14
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 13
- 235000011941 Tilia x europaea Nutrition 0.000 description 13
- 239000004571 lime Substances 0.000 description 13
- 229910019142 PO4 Inorganic materials 0.000 description 8
- 239000010452 phosphate Substances 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- DJCYDDALXPHSHR-UHFFFAOYSA-N 2-(2-propoxyethoxy)ethanol Chemical compound CCCOCCOCCO DJCYDDALXPHSHR-UHFFFAOYSA-N 0.000 description 4
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 4
- MOFPFBKKJKOCJG-UHFFFAOYSA-N 2-(2-butoxypropoxy)propan-1-ol;2-(2-hydroxyethoxy)ethanol Chemical compound OCCOCCO.CCCCOC(C)COC(C)CO MOFPFBKKJKOCJG-UHFFFAOYSA-N 0.000 description 3
- 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 3
- TVACALAUIQMRDF-UHFFFAOYSA-N dodecyl dihydrogen phosphate Chemical compound CCCCCCCCCCCCOP(O)(O)=O TVACALAUIQMRDF-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 210000004556 brain Anatomy 0.000 description 2
- 239000000573 polycarboxylate cement Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- DLYUQMMRRRQYAE-UHFFFAOYSA-N tetraphosphorus decaoxide Chemical compound O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 2
- 229920006163 vinyl copolymer Polymers 0.000 description 2
- GZMAAYIALGURDQ-UHFFFAOYSA-N 2-(2-hexoxyethoxy)ethanol Chemical compound CCCCCCOCCOCCO GZMAAYIALGURDQ-UHFFFAOYSA-N 0.000 description 1
- IIVCYFSRDZBYCV-UHFFFAOYSA-N C(CCCCCCCCCCC)[P] Chemical compound C(CCCCCCCCCCC)[P] IIVCYFSRDZBYCV-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910001854 alkali hydroxide Inorganic materials 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 150000005690 diesters Chemical class 0.000 description 1
- XXJWXESWEXIICW-UHFFFAOYSA-N diethylene glycol monoethyl ether Chemical compound CCOCCOCCO XXJWXESWEXIICW-UHFFFAOYSA-N 0.000 description 1
- 229940075557 diethylene glycol monoethyl ether Drugs 0.000 description 1
- LNTZHXQMPUKVNX-UHFFFAOYSA-N docosyl dihydrogen phosphate Chemical compound CCCCCCCCCCCCCCCCCCCCCCOP(O)(O)=O LNTZHXQMPUKVNX-UHFFFAOYSA-N 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- PHNWGDTYCJFUGZ-UHFFFAOYSA-L hexyl phosphate Chemical compound CCCCCCOP([O-])([O-])=O PHNWGDTYCJFUGZ-UHFFFAOYSA-L 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 125000001421 myristyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-M naphthalene-1-sulfonate Chemical compound C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-M 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
【課題】調製したコンクリート組成物の流動性や連行空気量、また得られる硬化体の強度に悪影響を及ぼすことなく、得られる硬化体の乾燥収縮率を２００μ以下の極めて小さい領域に抑えることができる超低収縮ＡＥコンクリート組成物を提供する。
【解決手段】セメント、石膏、水、細骨材、粗骨材、乾燥収縮低減剤、空気連行剤及びセメント分散剤を含有してなる超低収縮ＡＥコンクリート組成物の調製において、粗骨材としてＣａＯを５０質量％以上及びＭｇＯを２質量％以下の割合で含有する特定の石灰砕石を用い、また乾燥収縮低減剤として特定の（ポリ）アルキレングリコールモノアルキルエーテルを用い、更に空気連行剤として特定の有機リン酸エステル化合物を用い、しかもかかる特定の粗骨材及び乾燥収縮低減剤を所定の割合で用いると共に、石膏をセメントに対して所定の割合で用いた。
【選択図】なしAn object of the present invention is to suppress the drying shrinkage of an obtained cured body to an extremely small region of 200 μm or less without adversely affecting the fluidity and entrained air amount of the prepared concrete composition and the strength of the obtained cured body. An ultra low shrinkage AE concrete composition is provided.
In preparation of an ultra-low shrinkage AE concrete composition containing cement, gypsum, water, fine aggregate, coarse aggregate, dry shrinkage reducing agent, air entraining agent and cement dispersant, as coarse aggregate Uses specific crushed limestone containing CaO in a proportion of 50% by mass or more and MgO in a proportion of 2% by mass or less, using a specific (poly) alkylene glycol monoalkyl ether as a drying shrinkage reducing agent, and specifying as an air entraining agent And the specific coarse aggregate and the drying shrinkage reducing agent were used in a predetermined ratio, and gypsum was used in a predetermined ratio with respect to the cement.
[Selection figure] None
Description
本発明は超低収縮ＡＥコンクリート組成物に関する。近年、コンリート構造物の長寿命化や高品質化の観点から、コンリート構造物には特に乾燥収縮によるひび割れの発生を抑制することが要求されている。コンリート構造物の乾燥収縮によるひび割れを抑制するためには、一般建築物において乾燥収縮率を６００μ以下程度にする必要があり、また地下構造物等の拘束部材断面が大きい建築物において乾燥収縮率を４００μ以下程度にする必要があるといわれているが、その一方で実際の建築現場では、開口部や鉄筋の拘束の大きい部位において乾燥収縮率が２００μを超えると、ひび割れの発生を十分に抑制することが難しいと指摘されている。コンクリート構造物において乾燥収縮によるひび割れの発生を十分に抑制するためには、乾燥収縮率を２００μ以下の極めて小さい領域に抑える必要があるのである。本発明は、得られるコンクリート構造物（以下、単に硬化体という）において、乾燥収縮によるひび割れの発生を十分に抑制することができる超低収縮ＡＥコンクリート組成物に関する。 The present invention relates to an ultra-low shrinkage AE concrete composition. In recent years, from the viewpoint of extending the life and quality of a concrete structure, the concrete structure is required to suppress the occurrence of cracks due to drying shrinkage. In order to suppress cracking due to drying shrinkage of a concrete structure, it is necessary to reduce the drying shrinkage rate to about 600 μm or less in general buildings, and also to reduce the drying shrinkage rate in buildings with a large cross-section of restraint members such as underground structures. Although it is said that it is necessary to make it about 400 μm or less, on the other hand, in an actual construction site, if the drying shrinkage rate exceeds 200 μm in a portion where the opening or rebar is constrained, the occurrence of cracks is sufficiently suppressed. It is pointed out that this is difficult. In order to sufficiently suppress the occurrence of cracks due to drying shrinkage in a concrete structure, it is necessary to suppress the drying shrinkage rate to an extremely small region of 200 μm or less. The present invention relates to an ultra-low-shrinkage AE concrete composition that can sufficiently suppress the occurrence of cracks due to drying shrinkage in an obtained concrete structure (hereinafter simply referred to as a cured body).
従来、得られる硬化体の乾燥収縮率を低減する手段として、コンクリート組成物の調製時に、各種の乾燥収縮低減剤を使用すること（例えば特許文献１及び２参照）、また膨張材を使用すること（例えば特許文献３参照）、更には乾燥収縮低減剤と膨張材とを併用すること（例えば特許文献４参照）が知られている。 Conventionally, as a means of reducing the drying shrinkage rate of the obtained cured product, various drying shrinkage reducing agents are used at the time of preparing the concrete composition (see, for example, Patent Documents 1 and 2), and an expansion material is used. (For example, refer patent document 3) Furthermore, using a drying shrinkage reducing agent and an expansion material together is known (for example, refer patent document 4).
しかし、かかる従来の手段には、調製したコンクリート組成物の流動性や連行空気量、また得られる硬化体の強度に悪影響を及ぼすことなく、得られる硬化体の乾燥収縮率を２００μ以下の極めて小さい領域に抑えることができないという問題がある。
本発明が解決しようとする課題は、調製したコンクリート組成物の流動性や連行空気量、また得られる硬化体の強度に悪影響を及ぼすことなく、得られる硬化体の乾燥収縮率を２００μ以下の極めて小さい領域に抑えることができる超低収縮ＡＥコンクリートを提供する処にある。 The problem to be solved by the present invention is that the dry shrinkage rate of the obtained hardened body is 200 μm or less without adversely affecting the fluidity and entrained air amount of the prepared concrete composition and the strength of the obtained hardened body. The object is to provide ultra-low shrinkage AE concrete that can be confined to a small area.
しかして本発明者らは、前記の課題を解決するべく研究した結果、セメントと共に石膏を用い、また粗骨材、乾燥収縮低減剤及び空気連行剤として特定のものを用いて、しかもかかる石膏、粗骨材及び乾燥収縮低減剤を所定の割合で用いることが正しく好適であることを見出した。 As a result, the present inventors have studied to solve the above-mentioned problems, and as a result, used gypsum together with cement, and used specific materials as coarse aggregate, dry shrinkage reducing agent and air entraining agent, and such gypsum, It has been found that the use of the coarse aggregate and the drying shrinkage reducing agent in a predetermined ratio is correct and suitable.
すなわち本発明は、セメント、石膏、水、細骨材、下記の粗骨材、下記の乾燥収縮低減剤、下記の空気連行剤及びセメント分散剤を含有してなる超低収縮ＡＥコンクリート組成物であって、該粗骨材の単位量が８００〜１１００kg／ｍ３、また該乾燥収縮低減剤の単位量が１５〜６０kg／ｍ３であり、下記の数１で求められる単位量率が３５〜６５％であって、且つセメント１００質量部当たり石膏を０．５〜５質量部の割合で含有して成ることを特徴とする超低収縮ＡＥコンクリート組成物に係る。 That is, the present invention is an ultra-low-shrinkage AE concrete composition comprising cement, gypsum, water, fine aggregate, the following coarse aggregate, the following dry shrinkage reducing agent, the following air entraining agent, and a cement dispersant. there are, a unit amount of the coarse aggregate is 800~1100kg / m 3, the unit amount of the shrinkage reducing agent is 15~60kg / m 3, the unit dose rates obtained by the number 1 following 35 The ultra-low-shrinkage AE concrete composition is 65% and contains 0.5 to 5 parts by mass of gypsum per 100 parts by mass of cement.
粗骨材：ＣａＯ≧５０質量％及びＭｇＯ≦２質量％の割合で含有する石灰砕石 Coarse aggregate: Limestone containing CaO ≧ 50 mass% and MgO ≦ 2 mass%
乾燥収縮低減剤：下記の化１で示される（ポリ）アルキレングリコールモノアルキルエーテル Drying shrinkage reducing agent: (poly) alkylene glycol monoalkyl ether represented by the following chemical formula 1
空気連行剤：下記の化１で示される有機リン酸エステル化合物 Air entrainer: Organophosphate compound represented by the following chemical formula 1
化１及び化２において、
Ｒ１：炭素数３又は４のアルキル基
Ｒ２：炭素数８〜１８のアルキル基
Ｍ１，Ｍ２：水素原子、アルカリ金属又は有機アミン
Ａ：分子中に１〜３個のオキシエチレン単位のみ又は分子中に合計２〜５個のオキシエチレン単位とオキシプロピレン単位とで構成された（ポリ）オキシアルキレン基を有する（ポリ）アルキレングリコールから全ての水酸基を除いた残基
In Chemical Formula 1 and Chemical Formula 2,
R 1 : Alkyl group having 3 or 4 carbon atoms R 2 : Alkyl group having 8 to 18 carbon atoms M 1 , M 2 : Hydrogen atom, alkali metal or organic amine A: Only 1 to 3 oxyethylene units in the molecule Or a residue obtained by removing all hydroxyl groups from a (poly) alkylene glycol having a (poly) oxyalkylene group composed of a total of 2 to 5 oxyethylene units and oxypropylene units in the molecule
本発明に係る超低収縮ＡＥコンクリート組成物（以下、単に本発明のＡＥコンクリート組成物という）は、セメント、石膏、水、細骨材、粗骨材、乾燥収縮低減剤、空気連行剤及びセメント分散剤を含有して成るものである。これらのうちで、粗骨材、乾燥収縮低減剤及び空気連行剤としては、以下に説明するような特定のものを用いる。 The ultra-low shrinkage AE concrete composition according to the present invention (hereinafter simply referred to as the AE concrete composition of the present invention) includes cement, gypsum, water, fine aggregate, coarse aggregate, dry shrinkage reducing agent, air entraining agent, and cement. It contains a dispersant. Among these, as the coarse aggregate, the drying shrinkage reducing agent, and the air entraining agent, specific ones as described below are used.
本発明のＡＥコンクリート組成物に供する粗骨材は、ＣａＯ≧５０質量％及びＭｇＯ≦２質量％の割合で含有する石灰砕石である。ＡＥコンクリート組成物を調製するときに、粗骨材として石灰砕石を用いると、得られる硬化体の乾燥収縮率を比較的小さくできることは知られている。しかし、粗骨材にして一般的に石灰砕石を用いるだけでは、得られる硬化体の乾燥収縮率を４００〜６５０μ程度に抑えることができるにすぎない。他の条件を充足することを前提として、石灰砕石のなかでも、ＣａＯを５０質量％以上且つＭｇＯを２質量％以下の割合で含有する特定の石灰砕石を用いることにより初めて、得られる硬化体の乾燥収縮率を２００μ以下にまで抑えることができる。 The coarse aggregate used for the AE concrete composition of the present invention is limestone containing CaO ≧ 50 mass% and MgO ≦ 2 mass%. It is known that when AE concrete composition is prepared, the use of lime crushed stone as the coarse aggregate makes it possible to relatively reduce the drying shrinkage of the obtained cured product. However, only using crushed limestone as a coarse aggregate can only suppress the drying shrinkage of the obtained cured product to about 400 to 650 μm. Assuming that other conditions are satisfied, among the lime crushed stones, the use of a specific crushed crushed stone containing CaO in a proportion of 50 mass% or more and MgO in a proportion of 2 mass% or less is the first The drying shrinkage can be suppressed to 200 μm or less.
本発明のＡＥコンクリート組成物に供する乾燥収縮低減剤は、化１で示される（ポリ）アルキレングリコールモノアルキルエーテルである。化１中のＲ１は炭素数３又は４のアルキル基である。これには例えば、ノルマルプロピル基、イソプロピル基、ノルマルブチル基、イソブチル基、セカンダリーブチル基、ターシャリーブチル基等が挙げられるが、なかでもノルマルブチル基が好ましい。また化１中のＡは、１）分子中に１〜３個のオキシエチレン単位のみで構成された（ポリ）オキシエチレン基を有する（ポリ）エチレングリコールから全ての水酸基を除いた残基、２）分子中に合計２〜５個のオキシエチレン単位とオキシプロピレン単位とで構成されたポリオキシアルキレン基を有するポリアルキレングリコールから全ての水酸基を除いた残基である。ここで、オキシエチレン単位とオキシプロピレン単位の結合様式はランダム状でも又はブロック状でもよい。以上説明した乾燥収縮低減剤のなかでもジエチレングリコールモノブチルエーテルが好ましい。調製したＡＥコンクリート組成物の連行空気量の経時的な残存率が高く、また得られる硬化体の乾燥収縮率が低いからである。 The drying shrinkage reducing agent provided to the AE concrete composition of the present invention is a (poly) alkylene glycol monoalkyl ether represented by Chemical Formula 1. R 1 in Chemical Formula 1 is an alkyl group having 3 or 4 carbon atoms. Examples thereof include a normal propyl group, an isopropyl group, a normal butyl group, an isobutyl group, a secondary butyl group, and a tertiary butyl group. Among them, a normal butyl group is preferable. A in Chemical Formula 1 is 1) a residue obtained by removing all hydroxyl groups from (poly) ethylene glycol having a (poly) oxyethylene group composed of only 1 to 3 oxyethylene units in the molecule; ) A residue obtained by removing all hydroxyl groups from a polyalkylene glycol having a polyoxyalkylene group composed of a total of 2 to 5 oxyethylene units and oxypropylene units in the molecule. Here, the bonding mode of the oxyethylene unit and the oxypropylene unit may be random or block. Of the drying shrinkage reducing agents described above, diethylene glycol monobutyl ether is preferable. This is because the residual rate of entrained air in the prepared AE concrete composition with time is high, and the resulting cured product has a low drying shrinkage rate.
本発明のＡＥコンクリート組成物に供する空気連行剤は、化２で示される有機リン酸エステル化合物である。化２中のＲ２は、ノニル基、カプリル基、ラウリル基、ミリスチル基、セチル基、ステアリル基等の炭素数８〜１８のアルキル基であり、また化２中のＭ１及びＭ２は水素原子、アルカリ金属又は有機アミンである。したがって、化２で示される有機リン酸エステル化合物には、アルキルリン酸モノエステル、該アルキルリン酸モノエステルのアルカリ金属塩又は有機アミン塩が含まれる。なかでも、炭素数８のオクチルリン酸モノエステルカリウム塩が好ましい。空気連行剤としてかかる有機リン酸エステル化合物を用いると、前記のような乾燥収縮低減剤を比較的多量に用いても、調製したＡＥコンクリート組成物における連行空気量を経時的に安定させることができるからである。 The air entraining agent used for the AE concrete composition of the present invention is an organic phosphate compound represented by Chemical Formula 2. R 2 in Chemical Formula 2 is an alkyl group having 8 to 18 carbon atoms such as nonyl group, capryl group, lauryl group, myristyl group, cetyl group, stearyl group, and M 1 and M 2 in Chemical Formula 2 are hydrogen. An atom, an alkali metal or an organic amine. Therefore, the organic phosphate compound represented by Chemical Formula 2 includes alkyl phosphate monoesters, alkali metal salts or organic amine salts of the alkyl phosphate monoesters. Of these, octyl phosphoric acid monoester potassium salt having 8 carbon atoms is preferable. When such an organic phosphate ester compound is used as an air entraining agent, the amount of entrained air in the prepared AE concrete composition can be stabilized over time even when a relatively large amount of the above-described drying shrinkage reducing agent is used. Because.
化２で示される有機リン酸エステル化合物は公知の方法で合成できる。これには例えば、炭素数８〜１８の高級アルコールに無水リン酸を反応させた後、有機溶媒を用いて再結晶することにより、アルキルリン酸モノエステルを合成する方法、更にこのアルキルリン酸モノエステルを水酸化アルカリで中和することにより、アルキルリン酸モノエステルのアルカリ金属塩を合成する方法が挙げられる。 The organic phosphate compound represented by Chemical Formula 2 can be synthesized by a known method. This includes, for example, a method of synthesizing an alkyl phosphate monoester by reacting a higher alcohol having 8 to 18 carbon atoms with phosphoric anhydride and then recrystallizing using an organic solvent. A method of synthesizing an alkali metal salt of an alkyl phosphate monoester by neutralizing the ester with an alkali hydroxide is mentioned.
本発明のＡＥコンクリート組成物に供するセメント分散剤としては、リグニンスルホン酸塩、ナフタレンスルホン酸ホルマリン高縮合物塩、水溶性ビニル共重合体等の市販のものを使用でき、その種類を特に限定するものではないが、水溶性ビニル共重合体からなるポリカルボン酸塩系セメント分散剤（例えば特開昭５８−７４５５２号公報や特開平１−２２６７５７号公報に記載のもの）が好ましい。 As the cement dispersant to be used for the AE concrete composition of the present invention, commercially available products such as lignin sulfonate, naphthalene sulfonate formalin high condensate salt, water-soluble vinyl copolymer and the like can be used, and the types thereof are particularly limited. Although not a thing, the polycarboxylate-type cement dispersing agent (For example, the thing as described in Unexamined-Japanese-Patent No. 58-74552 and Unexamined-Japanese-Patent No. 1-2226757) which consists of a water-soluble vinyl copolymer is preferable.
本発明のＡＥコンクリート組成物に供する石膏としては、二水石膏、半水石膏、無水石膏等が挙げられるが、なかでも二水石膏が好ましい。 Examples of the gypsum to be used in the AE concrete composition of the present invention include dihydrate gypsum, hemihydrate gypsum, anhydrous gypsum, etc. Among them, dihydrate gypsum is preferable.
本発明のＡＥコンクリート組成物は、以上説明したような粗骨材、乾燥収縮低減剤、空気連行剤、セメント分散剤及び石膏の他に、セメント、水及び細骨材を含有して成るものである。セメントとしては、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、低熱ポルトランドセメント等の各種ポルトランドセメントの他に、高炉セメント、フライアッシュセメント、シリカフュームセメント等の各種混合セメントが挙げられる。なかでも普通ポルトランドセメントが好ましい。また、細骨材としては、川砂、山砂、海砂、砕砂等が挙げられる。 The AE concrete composition of the present invention comprises cement, water and fine aggregate in addition to the coarse aggregate, the drying shrinkage reducing agent, the air entraining agent, the cement dispersant and the gypsum as described above. is there. Examples of the cement include various mixed cements such as blast furnace cement, fly ash cement, and silica fume cement, in addition to various portland cements such as ordinary portland cement, early-strength portland cement, medium heat portland cement, and low heat portland cement. Of these, ordinary Portland cement is preferred. Examples of the fine aggregate include river sand, mountain sand, sea sand, and crushed sand.
本発明のＡＥコンクリート組成物は、前記した粗骨材の単位量を８００〜１１００kg／ｍ３とするが、好ましくは８５０〜１０５０kg／ｍ３とする。また前記した乾燥収縮低減剤の単位量を１５〜６０kg／ｍ３とするが、好ましくは１８〜５０kg／ｍ３とする。更に数１で求められる単位量率を３５〜６５％とするが、好ましくは４０〜６０％とする。そして石膏は、セメント１００質量部当たり、０．５〜５質量部の割合とするが、好ましくは１〜４質量部の割合とする。 AE concrete composition of the present invention is a unit amount of coarse aggregate described above with 800~1100kg / m 3, preferably a 850~1050kg / m 3. The unit amount of the drying shrinkage reducing agent is 15 to 60 kg / m 3 , preferably 18 to 50 kg / m 3 . Furthermore, although the unit amount rate calculated | required by several 1 shall be 35 to 65%, Preferably it is set to 40 to 60%. And gypsum is made into the ratio of 0.5-5 mass parts per 100 mass parts of cement, Preferably it is set as the ratio of 1-4 mass parts.
本発明のＡＥコンクリート組成物において、連行空気量は通常３〜８容量％とするが、４〜７容量％とするのが好ましい。 In the AE concrete composition of the present invention, the entrained air amount is usually 3 to 8% by volume, but preferably 4 to 7% by volume.
本発明のＡＥコンクリート組成物は、公知の方法で調製できるが、一方においてセメント、石膏、水、細骨材及び前記した粗骨材をミキサーで空練りし、また他方において前記した乾燥収縮低減剤、空気連行剤及びセメント分散剤を練り混ぜ水で希釈して、しかる後に双方を練り混ぜる方法が好ましい。本発明のＡＥコンクリート組成物の調製に際しては、本発明の効果を損なわない範囲内で、必要に応じて凝結促進剤、凝結遅延剤、防水剤、防腐剤、防錆剤等の他の添加剤を併用することができる。以上説明した本発明のＡＥコンクリート組成物によると、得られる硬化体は乾燥収縮率が２００μ以下のものとなる。 The AE concrete composition of the present invention can be prepared by a known method. On the one hand, cement, gypsum, water, fine aggregate and the above-mentioned coarse aggregate are kneaded with a mixer, and on the other hand, the above-mentioned drying shrinkage reducing agent. The air entraining agent and the cement dispersant are kneaded and diluted with water, and then both are kneaded. When preparing the AE concrete composition of the present invention, other additives such as a setting accelerator, a setting retarder, a waterproofing agent, a preservative, and a rust preventive agent are added within the range not impairing the effects of the present invention. Can be used in combination. According to the AE concrete composition of the present invention described above, the obtained cured product has a drying shrinkage of 200 μm or less.
本発明によると、調製したＡＥコンクリート組成物の流動性や連行空気量、また得られる硬化体の強度に悪影響を及ぼすことなく、得られる硬化体の乾燥収縮率を２００μ以下に抑えた超低収縮ＡＥコンクリート組成物を提供できるという効果がある。 According to the present invention, ultra-low shrinkage in which the dry shrinkage rate of the obtained cured product is suppressed to 200 μm or less without adversely affecting the fluidity and entrained air amount of the prepared AE concrete composition and the strength of the obtained cured product. There is an effect that an AE concrete composition can be provided.
本発明のＡＥコンクリート組成物の実施形態としては、次の１）〜７）が挙げられる。
１）単位量でセメントを３２０kg／ｍ３、二水石膏を９．６kg／ｍ３、細骨材を８５５kg／ｍ３、水を１４０kg／ｍ３、粗骨材として下記の石灰砕石Ｄ−１を９９３kg／ｍ３、乾燥収縮低減剤としてジエチレングリコールモノブチルエーテルを２０kg／ｍ３含有しており、更に空気連行剤としてオクチルリン酸モノエステルカリウム塩及びセメント分散剤（ポリカルボン酸塩系セメント分散剤、以下同じ）を含有していて、数１で求められる単位量率が５０％、空気量が４．４％の超低収縮ＡＥコンクリート組成物。
石灰砕石Ｄ−１：ＣａＯを５５．４２質量％及びＭｇＯを０．５５質量％含有する石灰砕石。
Examples of the AE concrete composition of the present invention include the following 1) to 7).
1) Unit weight 320 kg / m 3 of cement, gypsum and 9.6 kg / m 3, fine aggregates and 855kg / m 3, the water 140 kg / m 3, the following as coarse aggregate lime crushed stone D-1 the 993kg / m 3, drying shrinkage of diethylene glycol monobutyl ether and contain 20 kg / m 3 as reducing agent, further octyl phosphate monoester potassium salt and a cement dispersant as an air entraining agent (a polycarboxylic acid salt-based cement dispersant, The same applies hereinafter), an ultra-low-shrinkage AE concrete composition having a unit amount ratio determined by Equation 1 of 50% and an air amount of 4.4%.
Limestone D-1: Limestone containing 55.42% by mass of CaO and 0.55% by mass of MgO.
２）単位量でセメントを３２０kg／ｍ３、二水石膏を９．６kg／ｍ３、細骨材を８５５kg／ｍ３、水を１３０kg／ｍ３、粗骨材として前記の石灰砕石Ｄ−１を９９３kg／ｍ３、乾燥収縮低減剤としてジエチレングリコールモノブチルエーテルを３０kg／ｍ３含有しており、更に空気連行剤としてオクチルリン酸モノエステルカリウム塩及びセメント分散剤を含有していて、数１で求められる単位量率が５０％、空気量が４．３％の超低収縮ＡＥコンクリート組成物。 2) Unit weight 320 kg / m 3 of cement, gypsum and 9.6 kg / m 3, fine aggregates and 855kg / m 3, the water 130 kg / m 3, lime crushed stone of the as coarse aggregate D-1 the 993kg / m 3, dried and diethylene glycol monobutyl ether containing 30kg / m 3 as shrinkage reducing agent, further contain an octyl phosphate monoester potassium salt and a cement dispersant as an air entraining agent, determined by the number 1 Ultra-low-shrinkage AE concrete composition having a unit amount ratio of 50% and an air amount of 4.3%.
３）単位量でセメントを３２０kg／ｍ３、二水石膏を３．２kg／ｍ３、細骨材を８５５kg／ｍ３、水を１１５kg／ｍ３、粗骨材として前記の石灰砕石Ｄ−１を９９３kg／ｍ３、乾燥収縮低減剤としてジエチレングリコールモノブチルエーテルを４５kg／ｍ３含有しており、更に空気連行剤としてオクチルリン酸モノエステルカリウム塩及びセメント分散剤を含有していて、数１で求められる単位量率が５０％、空気量が４．７％の超低収縮ＡＥコンクリート組成物。 3) Unit weight 320 kg / m 3 of cement, gypsum and 3.2 kg / m 3, fine aggregates and 855kg / m 3, the water 115 kg / m 3, lime crushed stone of the as coarse aggregate D-1 the 993kg / m 3, dried and diethylene glycol monobutyl ether containing 45 kg / m 3 as shrinkage reducing agent, further contain an octyl phosphate monoester potassium salt and a cement dispersant as an air entraining agent, determined by the number 1 Ultra-low-shrinkage AE concrete composition having a unit amount ratio of 50% and an air amount of 4.7%.
４）単位量でセメントを３２０kg／ｍ３、二水石膏を９．６kg／ｍ３、細骨材を８５５kg／ｍ３、水を１３０kg／ｍ３、粗骨材として前記の石灰砕石Ｄ−１を９９３kg／ｍ３、乾燥収縮低減剤としてジエチレングリコールモノプロピルエーテルを３０kg／ｍ３含有しており、更に空気連行剤としてオクチルリン酸モノエステルカリウム塩及びセメント分散剤を含有していて、数１で求められる単位量率が５０％、空気量が４．８％の超低収縮ＡＥコンクリート組成物。 4) Unit weight 320 kg / m 3 of cement, gypsum and 9.6 kg / m 3, fine aggregates and 855kg / m 3, the water 130 kg / m 3, lime crushed stone of the as coarse aggregate D-1 the 993kg / m 3, dried and diethylene glycol monopropyl ether containing 30kg / m 3 as shrinkage reducing agent, further contain an octyl phosphate monoester potassium salt and a cement dispersant as an air entraining agent, the number 1 An ultra-low shrinkage AE concrete composition having a required unit amount ratio of 50% and an air amount of 4.8%.
５）単位量でセメントを３２０kg／ｍ３、半水石膏を６．４kg／ｍ３、細骨材を８５５kg／ｍ３、水を１３０kg／ｍ３、粗骨材として前記の石灰砕石Ｄ−１を９９３kg／ｍ３、乾燥収縮低減剤としてジエチレングリコールジプロピレングリコールモノブチルエーテルを３０kg／ｍ３含有しており、更に空気連行剤としてラウリルリン酸モノエステルカリウム塩及びセメント分散剤を含有していて、数１で求められる単位量率が５０％、空気量が４．４％の超低収縮ＡＥコンクリート組成物。 5) Unit weight 320 kg / m 3 of cement, gypsum hemihydrate and 6.4 kg / m 3, fine aggregates and 855kg / m 3, the water 130 kg / m 3, lime crushed stone of the as coarse aggregate D-1 the 993kg / m 3, dried and diethylene glycol dipropylene glycol monobutyl ether containing 30kg / m 3 as shrinkage reducing agent, further contain lauryl phosphate monoester potassium salt and a cement dispersant as an air entraining agent, the number An ultra-low-shrinkage AE concrete composition having a unit amount ratio determined in 1 of 50% and an air amount of 4.4%.
６）単位量でセメントを３２０kg／ｍ３、二水石膏を９．６kg／ｍ３、細骨材を９９３kg／ｍ３、水を１３０kg／ｍ３、粗骨材として前記の石灰砕石Ｄ−１を８５０kg／ｍ３、乾燥収縮低減剤としてジエチレングリコールモノブチルエーテルを３０kg／ｍ３含有しており、更に空気連行剤としてオクチルリン酸モノエステルカリウム塩及びセメント分散剤を含有していて、数１で求められる単位量率が５０％、空気量が４．６％の超低収縮ＡＥコンクリート組成物。 6) Unit weight 320 kg / m 3 of cement, gypsum and 9.6 kg / m 3, fine aggregates and 993kg / m 3, the water 130 kg / m 3, lime crushed stone of the as coarse aggregate D-1 850 kg / m 3 , 30 kg / m 3 of diethylene glycol monobutyl ether as a dry shrinkage reducing agent, and octyl phosphate monoester potassium salt and a cement dispersant as an air entraining agent. Ultra-low shrinkage AE concrete composition having a unit amount ratio of 50% and an air amount of 4.6%.
７）単位量でセメントを３７８kg／ｍ３、二水石膏を９．６kg／ｍ３、細骨材を８１６kg／ｍ３、水を１５０kg／ｍ３、粗骨材として下記の石灰砕石Ｄ−２を９５６kg／ｍ３、乾燥収縮低減剤としてジエチレングリコールモノブチルエーテルを２０kg／ｍ３含有しており、更に空気連行剤としてオクチルリン酸モノエステルカリウム塩及びセメント分散剤を含有していて、数１で求められる単位量率が４５％、空気量が４．６％の超低収縮ＡＥコンクリート組成物。
石灰砕石Ｄ−２：ＣａＯを５４．８５質量％及びＭｇＯを０．３５質量％含有する石灰砕石。
7) Unit weight 378 kg / m 3 of cement, gypsum and 9.6 kg / m 3, fine aggregates and 816kg / m 3, the water 150 kg / m 3, the following as coarse aggregate lime crushed stone D-2 the 956kg / m 3, drying shrinkage and contains 20 kg / m 3 of diethylene glycol monobutyl ether as a reducing agent, further contain an octyl phosphate monoester potassium salt and a cement dispersant as an air entraining agent, determined by the number 1 Ultra low-shrinkage AE concrete composition having a unit rate of 45% and an air content of 4.6%.
Limestone D-2: Limestone containing 54.85% by mass of CaO and 0.35% by mass of MgO.
８）単位量でセメントを３７８kg／ｍ３、二水石膏を９．６kg／ｍ３、細骨材を８１６kg／ｍ３、水を１４０kg／ｍ３、粗骨材として前記の石灰砕石Ｄ−２を９５６kg／ｍ３、乾燥収縮低減剤としてジエチレングリコールモノプロピルエーテルを３０kg／ｍ３含有しており、更に空気連行剤としてオクチルリン酸モノエステルカリウム塩及びセメント分散剤を含有していて、数１で求められる単位量率が４５％、空気量が４．９％の超低収縮ＡＥコンクリート組成物。 8) Unit weight 378 kg / m 3 of cement, gypsum and 9.6 kg / m 3, fine aggregates and 816kg / m 3, the water 140 kg / m 3, the lime as coarse aggregate crushed stone D-2 the 956kg / m 3, dried and diethylene glycol monopropyl ether containing 30kg / m 3 as shrinkage reducing agent, further contain an octyl phosphate monoester potassium salt and a cement dispersant as an air entraining agent, the number 1 An ultra-low shrinkage AE concrete composition having a required unit amount ratio of 45% and an air amount of 4.9%.
９）単位量でセメントを３７８kg／ｍ３、二水石膏を３．２kg／ｍ３、細骨材を８１６kg／ｍ３、水を１５５kg／ｍ３、粗骨材として前記の石灰砕石Ｄ−２を９５６kg／ｍ３、乾燥収縮低減剤としてジエチレングリコールジプロピレングリコールモノブチルエーテルを４５kg／ｍ３含有しており、更に空気連行剤としてラウリルリン酸モノエステルカリウム塩及びセメント分散剤を含有していて、数１で求められる単位量率が４５％、空気量が４．８％の超低収縮ＡＥコンクリート組成物。 9) Unit weight 378 kg / m 3 of cement, gypsum and 3.2 kg / m 3, fine aggregates and 816kg / m 3, the water 155 kg / m 3, the lime as coarse aggregate crushed stone D-2 the 956kg / m 3, dried and diethylene glycol dipropylene glycol monobutyl ether containing 45 kg / m 3 as shrinkage reducing agent, further contain lauryl phosphate monoester potassium salt and a cement dispersant as an air entraining agent, the number An ultra-low-shrinkage AE concrete composition having a unit amount ratio calculated in 1 of 45% and an air amount of 4.8%.
１０）単位量でセメントを３７８kg／ｍ３、二水石膏を９．６kg／ｍ３、細骨材を７２４kg／ｍ３、水を１４０kg／ｍ３、粗骨材として前記の石灰砕石Ｄ−２を１０５０kg／ｍ３、乾燥収縮低減剤としてジエチレングリコールモノプロピルエーテルを３０kg／ｍ３含有しており、更に空気連行剤としてオクチルリン酸モノエステルカリウム塩及びセメント分散剤を含有していて、数１で求められる単位量率が４５％、空気量が４．６％の超低収縮ＡＥコンクリート組成物。 10) Unit weight 378 kg / m 3 of cement, gypsum and 9.6 kg / m 3, fine aggregates and 724kg / m 3, the water 140 kg / m 3, the lime as coarse aggregate crushed stone D-2 1050 kg / m 3 , diethylene glycol monopropyl ether 30 kg / m 3 as a drying shrinkage reducing agent, and further octyl phosphate monoester potassium salt and cement dispersant as an air entrainer, An ultra-low shrinkage AE concrete composition having a required unit amount ratio of 45% and an air amount of 4.6%.
以下、本発明の構成及び効果をより具体的にするため、実施例等を挙げるが、本発明が該実施例に限定されるというものではない。なお、以下の実施例等において、別に記載しない限り、％は質量％を、また部は質量部を意味する。 Hereinafter, in order to make the configuration and effects of the present invention more specific, examples and the like will be described. However, the present invention is not limited to the examples. In the following examples and the like, unless otherwise indicated,% means mass%, and part means mass part.
試験区分１（超低収縮ＡＥコンクリート組成物の調製）
実施例１
表１に記載した調合条件で、５０リットルのパン型強制練りミキサーに、普通ポルトランドセメント（密度＝３．１６ｇ／cm３、ブレーン値３３００）、二水石膏、細骨材（神栖産陸砂、密度＝２．６２ｇ／cm３）、空気連行剤（オクチルリン酸モノエステルカリウム塩）、セメント分散剤（竹本油脂社製のポリカルボン酸塩系セメント分散剤、商品名チューポールＨＰ−１１）及び乾燥収縮低減剤（ジエチレングリコールモノブチルエーテル）を練り混ぜ水と共に投入し、４５秒間練り混ぜた。次に、粗骨材（秩父産石灰砕石、密度＝２．７０ｇ／cm３）を投入して、６０秒間練り混ぜ、目標スランプが１８±１cm、目標空気量が４．５±１％の範囲とした超低収縮ＡＥコンクリート組成物を調製した。尚、空気連行剤及びセメント分散剤の添加量は表１の脚注に示した。
Test category 1 (Preparation of ultra-low shrinkage AE concrete composition)
Example 1
Under the mixing conditions described in Table 1, a 50 liter bread-type forced kneading mixer was mixed with ordinary Portland cement (density = 3.16 g / cm 3 , brain value 3300), dihydrate gypsum, fine aggregate (land sand from Kamisu, Density = 2.62 g / cm 3 ), air entrainer (octyl phosphate monoester potassium salt), cement dispersant (polycarboxylate cement dispersant manufactured by Takemoto Yushi Co., Ltd., trade name Tupol HP-11) and A drying shrinkage reducing agent (diethylene glycol monobutyl ether) was kneaded and charged with water, and kneaded for 45 seconds. Next, put coarse aggregate (chichibu limestone, density = 2.70 g / cm 3 ) and knead for 60 seconds, target slump is 18 ± 1cm, target air volume is in the range of 4.5 ± 1% An ultra-low shrinkage AE concrete composition was prepared. The amounts of air entrainer and cement dispersant added are shown in the footnotes in Table 1.
実施例２〜６及び比較例１〜１０
実施例１と同様にして、表１に記載した調合条件でＡＥコンクリート組成物を調製した。
Examples 2-6 and Comparative Examples 1-10
In the same manner as in Example 1, an AE concrete composition was prepared under the blending conditions described in Table 1.
実施例７
表１に記載した調合条件で、５０リットルのパン型強制練りミキサーに、普通ポルトランドセメント（密度＝３．１６ｇ／cm３、ブレーン値３３００）、二水石膏、細骨材（神栖産陸砂、密度＝２．６２ｇ／cm３）、空気連行剤（オクチルリン酸モノエステルカリウム塩）、セメント分散剤（竹本油脂社製のポリカルボン酸塩系セメント分散剤、商品名チューポールＨＰ−１１）及び乾燥収縮低減剤（ジエチレングリコールモノブチルエーテル）を練り混ぜ水と共に投入して、４５秒間練り混ぜた。次に、粗骨材（鳥形山産石灰砕石、密度＝２．７０ｇ／cm３）を投入し、６０秒間練り混ぜ、目標スランプが１８±１cm、目標空気量が４．５±１％の範囲とした超低収縮ＡＥコンクリート組成物を調製した。尚、空気連行剤及びセメント分散剤の添加量は表１の脚注に示した。
Example 7
Under the mixing conditions described in Table 1, a 50 liter bread-type forced kneading mixer was mixed with ordinary Portland cement (density = 3.16 g / cm 3 , brain value 3300), dihydrate gypsum, fine aggregate (land sand from Kamisu, Density = 2.62 g / cm 3 ), air entrainer (octyl phosphate monoester potassium salt), cement dispersant (polycarboxylate cement dispersant manufactured by Takemoto Yushi Co., Ltd., trade name Tupol HP-11) and A drying shrinkage reducing agent (diethylene glycol monobutyl ether) was kneaded and added together with water, and kneaded for 45 seconds. Next, coarse aggregate (Torigatayama lime crushed stone, density = 2.70 g / cm 3 ) is added, kneaded for 60 seconds, target slump is 18 ± 1 cm, target air volume is in the range of 4.5 ± 1% An ultra-low shrinkage AE concrete composition was prepared. The amounts of air entrainer and cement dispersant added are shown in the footnotes in Table 1.
実施例８〜１０及び比較例１１〜１７
実施例６と同様にして、表１に記載した調合条件でＡＥコンクリート組成物を調製した。
Examples 8 to 10 and Comparative Examples 11 to 17
In the same manner as in Example 6, an AE concrete composition was prepared under the blending conditions described in Table 1.
表１において、
空気連行剤の使用量：普通ポルトランドセメント１００部に対して、実施例１〜６及び比較例１〜１０は０．００４部の割合、実施例７〜１０及び比較例１１〜１７は０．００３部の割合とした。尚、目標空気量は各例いずれも４．５±１％とした。
セメント分散剤の使用量：普通ポルトランドセメント１００部に対して、実施例１〜６及び比較例１〜１０は１部の割合、実施例７〜１０及び比較例１１〜１７は０．８部の割合とした。
単位量率：数１で求められる単位量率
＊１：セメント１００部当たり、用いた石膏の種類と量（部）
Ａ−１：オクチルリン酸モノエステルカリウム塩
Ａ−２：ラウリルリン酸モノエステルカリウム塩
Ａ−３：ヘキシルリン酸モノエステルナトリウム塩
Ａ−４：ベへニルリン酸モノエステルカリウム塩
Ａ−５：ラウリルリン酸ジエステルカリウム塩
Ｂ−１：ポリカルボン酸塩系セメント分散剤（竹本油脂社製、商品名チューポールＨＰ−１１）
Ｃ−１：ジエチレングリコールモノブチルエーテル
Ｃ−２：ジエチレングリコールモノプロピルエーテル
Ｃ−３：ジエチレングリコールジプロピレングリコールモノブチルエーテル
Ｃ−４：ジエチレングリコールモノエチルエーテル
Ｃ−５：ジエチレングリコールモノヘキシルエーテル
Ｃ−６：トリエチレングリコールトリプロピレングリコールモノモノブチルエーテル
Ｅ−１：セメント１００部当たり二水石膏を３部使用
Ｅ−２：セメント１００部当たり二水石膏を１部使用
Ｅ−３：セメント１００部当たり半水石膏を２部使用
Ｅ−４：セメント１００部当たり二水石膏を７部使用
粗骨材の種類と化学成分：下記の表２に分析値を示した。
In Table 1,
Amount of air entraining agent used: 0.001 part for Examples 1 to 6 and Comparative Examples 1 to 10 relative to 100 parts of ordinary Portland cement, 0.003 for Examples 7 to 10 and Comparative Examples 11 to 17 The ratio of parts. The target air amount was 4.5 ± 1% in each example.
Amount of cement dispersant used: 1 part of Examples 1 to 6 and Comparative Examples 1 to 10 relative to 100 parts of ordinary Portland cement, 0.8 parts of Examples 7 to 10 and Comparative Examples 11 to 17 It was a ratio.
Unit amount rate: Unit amount rate obtained from Equation 1 * 1: Type and amount of gypsum used per 100 parts of cement (parts)
A-1: Octyl phosphate monoester potassium salt A-2: Lauryl phosphate monoester potassium salt A-3: Hexyl phosphate monoester sodium salt A-4: Behenyl phosphate monoester potassium salt A-5: Lauryl phosphorus Acid diester potassium salt B-1: Polycarboxylate-based cement dispersant (trade name Tupol HP-11, manufactured by Takemoto Yushi Co., Ltd.)
C-1: Diethylene glycol monobutyl ether C-2: Diethylene glycol monopropyl ether C-3: Diethylene glycol dipropylene glycol monobutyl ether C-4: Diethylene glycol monoethyl ether C-5: Diethylene glycol monohexyl ether C-6: Triethylene glycol tripropylene E-1: Use 3 parts of dihydrate gypsum per 100 parts of cement E-2: Use 1 part of dihydrate gypsum per 100 parts of cement E-3: Use 2 parts of hemihydrate gypsum per 100 parts of cement E- 4: 7 parts of dihydric gypsum used per 100 parts of cement Coarse aggregate type and chemical composition: Analytical values are shown in Table 2 below.
試験区分２（超低収縮ＡＥコンクリート組成物の評価等）
調製した各例の超低収縮ＡＥコンクリート組成物について、空気量、スランプ、これらの残存率、乾燥収縮率及び圧縮強度を下記のように求め、結果を表３にまとめて示した。
Test category 2 (evaluation of ultra-low shrinkage AE concrete composition, etc.)
About the prepared ultra-low-shrinkage AE concrete composition, the air amount, slump, their residual rate, drying shrinkage rate, and compressive strength were determined as follows, and the results are summarized in Table 3.
・空気量（容量％）：練り混ぜ直後のもの及び更に６０分間静置のものについて、ＪＩＳ−Ａ１１２８に準拠して測定した。
・空気量残存率（％）：（６０分間静置後の空気量／練り混ぜ直後の空気量）×１００で求めた。
・スランプ（cm）：空気量の測定と同時にＪＩＳ−Ａ１１０１に準拠して測定した。
・スランプ残存率（％）：（６０分間静置後のスランプ／練り混ぜ直後のスランプ）×１００で求めた。
・乾燥収縮率（μ）：ＪＩＳ−Ａ１１２９に準拠し、各例の超低収縮ＡＥコンクリート組成物を２０℃×６０％ＲＨの条件下で保存した材齢２６週の供試体について、コンパレータ法により乾燥収縮ひずみを測定し、乾燥収縮率を求めた。この数値は小さいほど、乾燥収縮が小さいことを示す。
・圧縮強度（Ｎ／mm２）：各例の超低収縮ＡＥコンクリート組成物について、ＪＩＳ−Ａ１１０８に準拠し、材齢７日と材齢２８日で測定した。
-Amount of air (volume%): Measured in accordance with JIS-A1128 for those just after mixing and those that were left still for 60 minutes.
-Air amount residual ratio (%): (Air amount after standing for 60 minutes / Air amount immediately after kneading) x 100.
-Slump (cm): Measured according to JIS-A1101 simultaneously with the measurement of the air amount.
-Slump residual rate (%): (slump after standing for 60 minutes / slump just after mixing) x 100.
Dry shrinkage rate (μ): According to JIS-A1129, a specimen of 26 weeks of age in which the ultra-low-shrinkage AE concrete composition of each example was stored under the condition of 20 ° C. × 60% RH was measured by a comparator method. The drying shrinkage strain was measured to determine the drying shrinkage rate. The smaller this value, the smaller the drying shrinkage.
-Compressive strength (N / mm < 2 >): About the ultra-low shrinkage | contraction AE concrete composition of each example, based on JIS-A1108, it measured by material age 7 days and material age 28 days.
Claims (9)
粗骨材：ＣａＯ≧５０質量％及びＭｇＯ≦２質量％の割合で含有する石灰砕石
乾燥収縮低減剤：下記の化１で示される（ポリ）アルキレングリコールモノアルキルエーテル
Ｒ１：炭素数３又は４のアルキル基
Ｒ２：炭素数８〜１８のアルキル基
Ｍ１，Ｍ２：水素原子、アルカリ金属又は有機アミン
Ａ：分子中に１〜３個のオキシエチレン単位のみ又は合計２〜５個のオキシエチレン単位とオキシプロピレン単位とで構成された（ポリ）オキシアルキレン基を有する（ポリ）アルキレングリコールから全ての水酸基を除いた残基）
Coarse aggregate: Limestone containing CaO ≧ 50% by mass and MgO ≦ 2% by mass Drying shrinkage reducing agent: (poly) alkylene glycol monoalkyl ether represented by the following chemical formula 1
R 1 : Alkyl group having 3 or 4 carbon atoms R 2 : Alkyl group having 8 to 18 carbon atoms M 1 , M 2 : Hydrogen atom, alkali metal or organic amine A: Only 1 to 3 oxyethylene units in the molecule Or a residue obtained by removing all hydroxyl groups from a (poly) alkylene glycol having a (poly) oxyalkylene group composed of a total of 2 to 5 oxyethylene units and oxypropylene units)
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| JP2019196282A (en) * | 2018-05-09 | 2019-11-14 | 花王株式会社 | Hydration heat suppressing agent for hydraulic composition |
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