JP5508057B2 - Alkali recovery agent and alkalinity recovery method for neutralized concrete molding - Google Patents
Alkali recovery agent and alkalinity recovery method for neutralized concrete molding Download PDFInfo
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- JP5508057B2 JP5508057B2 JP2010040735A JP2010040735A JP5508057B2 JP 5508057 B2 JP5508057 B2 JP 5508057B2 JP 2010040735 A JP2010040735 A JP 2010040735A JP 2010040735 A JP2010040735 A JP 2010040735A JP 5508057 B2 JP5508057 B2 JP 5508057B2
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- molded body
- concrete molded
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- 239000004567 concrete Substances 0.000 title claims description 67
- 238000011084 recovery Methods 0.000 title claims description 59
- 239000003795 chemical substances by application Substances 0.000 title claims description 48
- 238000000034 method Methods 0.000 title claims description 20
- 238000000465 moulding Methods 0.000 title claims description 13
- 239000003513 alkali Substances 0.000 title description 3
- -1 Amide compound Chemical class 0.000 claims description 20
- 239000007864 aqueous solution Substances 0.000 claims description 14
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 125000001931 aliphatic group Chemical group 0.000 claims description 6
- 125000004432 carbon atom Chemical group C* 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 239000011396 hydraulic cement Substances 0.000 claims description 3
- 125000001183 hydrocarbyl group Chemical group 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 229930195735 unsaturated hydrocarbon Natural products 0.000 claims description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 9
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 9
- 235000014113 dietary fatty acids Nutrition 0.000 description 8
- 239000000194 fatty acid Substances 0.000 description 8
- 229930195729 fatty acid Natural products 0.000 description 8
- 150000004665 fatty acids Chemical class 0.000 description 8
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 7
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- 235000011181 potassium carbonates Nutrition 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000006386 neutralization reaction Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical compound [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 238000004821 distillation Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 3
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 3
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 3
- OYHQOLUKZRVURQ-HZJYTTRNSA-N Linoleic acid Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(O)=O OYHQOLUKZRVURQ-HZJYTTRNSA-N 0.000 description 3
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- 239000005642 Oleic acid Substances 0.000 description 3
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 3
- 238000007112 amidation reaction Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 3
- 235000020778 linoleic acid Nutrition 0.000 description 3
- OYHQOLUKZRVURQ-IXWMQOLASA-N linoleic acid Natural products CCCCC\C=C/C\C=C\CCCCCCCC(O)=O OYHQOLUKZRVURQ-IXWMQOLASA-N 0.000 description 3
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 239000007900 aqueous suspension Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- GHVNFZFCNZKVNT-UHFFFAOYSA-N decanoic acid Chemical compound CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 2
- VKOBVWXKNCXXDE-UHFFFAOYSA-N icosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCC(O)=O VKOBVWXKNCXXDE-UHFFFAOYSA-N 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- QYDYPVFESGNLHU-KHPPLWFESA-N methyl oleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC QYDYPVFESGNLHU-KHPPLWFESA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- WWZKQHOCKIZLMA-UHFFFAOYSA-N octanoic acid Chemical compound CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 description 2
- 238000001139 pH measurement Methods 0.000 description 2
- 235000011118 potassium hydroxide Nutrition 0.000 description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000005809 transesterification reaction Methods 0.000 description 2
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 2
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 2
- ALSTYHKOOCGGFT-KTKRTIGZSA-N (9Z)-octadecen-1-ol Chemical compound CCCCCCCC\C=C/CCCCCCCCO ALSTYHKOOCGGFT-KTKRTIGZSA-N 0.000 description 1
- 235000021357 Behenic acid Nutrition 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000005632 Capric acid (CAS 334-48-5) Substances 0.000 description 1
- 239000005635 Caprylic acid (CAS 124-07-2) Substances 0.000 description 1
- LVGKNOAMLMIIKO-UHFFFAOYSA-N Elaidinsaeure-aethylester Natural products CCCCCCCCC=CCCCCCCCC(=O)OCC LVGKNOAMLMIIKO-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000005639 Lauric acid Substances 0.000 description 1
- 235000021314 Palmitic acid Nutrition 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 238000007259 addition reaction Methods 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 230000009435 amidation Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 229940116226 behenic acid Drugs 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- DDXLVDQZPFLQMZ-UHFFFAOYSA-M dodecyl(trimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)C DDXLVDQZPFLQMZ-UHFFFAOYSA-M 0.000 description 1
- QYDYPVFESGNLHU-UHFFFAOYSA-N elaidic acid methyl ester Natural products CCCCCCCCC=CCCCCCCCC(=O)OC QYDYPVFESGNLHU-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000004702 methyl esters Chemical class 0.000 description 1
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 229960002446 octanoic acid Drugs 0.000 description 1
- 229940055577 oleyl alcohol Drugs 0.000 description 1
- XMLQWXUVTXCDDL-UHFFFAOYSA-N oleyl alcohol Natural products CCCCCCC=CCCCCCCCCCCO XMLQWXUVTXCDDL-UHFFFAOYSA-N 0.000 description 1
- 125000006353 oxyethylene group Chemical group 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 235000003441 saturated fatty acids Nutrition 0.000 description 1
- 150000004671 saturated fatty acids Chemical class 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- 239000011800 void material Substances 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5007—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with salts or salty compositions, e.g. for salt glazing
- C04B41/501—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with salts or salty compositions, e.g. for salt glazing containing carbon in the anion, e.g. carbonates
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
Description
本発明は、中性化コンクリート成型体のアルカリ性回復剤及びアルカリ性回復方法に関する。一般に、鉄筋コンクリートはアルカリ性を保持し、内部の鉄筋の錆の発生を抑制して、成型体やその構造物を維持している。しかし、鉄筋コンクリートは、長年月が経過すると空気中の炭酸ガスや亜硫酸ガス等の酸性ガスを吸収して、表面から中性化が進行し、やがて深部にまで中性化するという性質があり、鉄筋の腐食や膨張による亀裂の発生が起こって、強度の低下等を招くという劣化現象が知られている。このようなコンクリート成型体の劣化を防止するために、従来、中性化コンクリート成型体（中性化したコンクリート成型体、以下同じ）にアルカリ性回復剤を塗布して含浸させる方法が行なわれている。本発明はかかる中性化コンクリート成型体のアルカリ性回復剤及び該アルカリ性回復剤を用いた中性化コンクリート成型体のアルカリ性回復方法に関する。 The present invention relates to an alkaline recovery agent and an alkaline recovery method for a neutralized concrete molded body. In general, reinforced concrete maintains alkalinity, suppresses the occurrence of rust on the internal reinforcing bars, and maintains the molded body and its structure. However, reinforced concrete absorbs acidic gases such as carbon dioxide and sulfurous acid gas in the air after many years, and the neutralization proceeds from the surface and eventually becomes deeper. There is known a deterioration phenomenon in which cracks occur due to corrosion or expansion of the steel, resulting in a decrease in strength. In order to prevent such deterioration of the concrete molded body, conventionally, a method has been used in which a neutralized concrete molded body (neutralized concrete molded body, hereinafter the same) is coated with an alkaline recovery agent and impregnated. . The present invention relates to an alkalinity recovery agent for such a neutralized concrete molded body and a method for recovering alkalinity of the neutralized concrete molded body using the alkaline recovery agent.
従来、前記のようなアルカリ性回復剤としては、アルカリ金属水酸化物、アルカリ金属アルコキシド、芳香族カルボン酸塩のアルコール溶液、アルカリ金属炭酸塩、珪酸アルカリ金属塩、亜硝酸アルカリ金属塩、４級アンモニウム塩型カチオン活性剤等が報告されており（例えば、特許文献１〜５参照）、これらのアルカリ性回復剤を用いたアルカリ性回復方法も報告されている（例えば、特許文献６〜７参照）。しかし、これら従来のアルカリ性回復剤を用い、中性化コンクリート成型体に塗布して含浸させる方法を試みても、中性化コンクリート成型体は内部の空隙が極めて小さいために表面層の浅い部分のアルカリ性回復だけに留まり、アルカリ性回復剤が中性化コンクリート成型体の深部、すなわち鉄筋近傍にまで浸透することができないという問題がある。 Conventionally, as the above alkaline restoring agent, alkali metal hydroxide, alkali metal alkoxide, alcohol solution of aromatic carboxylate, alkali metal carbonate, alkali metal silicate, alkali metal nitrite, quaternary ammonium Salt type cationic activators and the like have been reported (for example, see Patent Documents 1 to 5), and alkaline recovery methods using these alkaline recovery agents have also been reported (for example, see Patent Documents 6 to 7). However, even when using these conventional alkaline recovery agents and trying to apply and impregnate the neutralized concrete molded body, the neutralized concrete molded body has a very small internal void, so that There is a problem that the alkaline recovery agent cannot be penetrated into the deep part of the neutralized concrete molded body, that is, the vicinity of the reinforcing bar, only in the alkaline recovery.
本発明が解決しようとする課題は、中性化コンクリート成型体の表面層だけでなく深部にまでアルカリ性を回復することができるアルカリ性回復剤及びアルカリ性回復方法を提供する処にある。 The problem to be solved by the present invention is to provide an alkaline recovery agent and an alkaline recovery method capable of recovering alkalinity not only to the surface layer of the neutralized concrete molded body but also to the deep part.
しかして本発明者らは、前記の課題を解決すべく研究した結果、特定の２成分の化合物を特定の割合で含有するアルカリ性回復剤及びそれを用いるアルカリ性回復方法が正しく好適であることを見出した。 Thus, as a result of studies to solve the above-mentioned problems, the present inventors have found that an alkaline recovery agent containing a specific two-component compound in a specific ratio and an alkaline recovery method using the same are suitable. It was.
すなわち本発明は、下記のＡ成分及びＢ成分から成り、該Ａ成分を０．１〜６０質量％及び該Ｂ成分を４０〜９９．９質量％（合計１００質量％）の割合で含有して成ることを特徴とする中性化コンクリート成型体のアルカリ性回復剤に係る。 That is, this invention consists of the following A component and B component, contains this A component in the ratio of 0.1-60 mass% and this B component in 40-99.9 mass% (total 100 mass%). The present invention relates to an alkaline recovery agent for a neutralized concrete molded body.
Ａ成分：下記の化１で示されるアミド化合物 Component A: Amide compound represented by the following chemical formula 1
化１において、
ｎ，ｍ：ｎ＋ｍが３〜１５の範囲となる１以上の整数
Ｒ：炭素数７〜２１の飽和又は不飽和の脂肪族炭化水素
In chemical formula 1,
n, m: an integer of 1 or more where n + m is in the range of 3 to 15 R: saturated or unsaturated aliphatic hydrocarbon having 7 to 21 carbon atoms
Ｂ成分：炭酸カリウム B component: Potassium carbonate
また本発明は、該アルカリ性回復剤を水で希釈して水溶液とし、該水溶液を中性化コンクリート成型体に塗布又は注入して該中性化コンクリート成型体内部に浸透させ、該中性化コンクリート成型体内部の深部にまでアルカリ性を付与することを特徴とする中性化コンクリート成型体のアルカリ性回復方法に係る。 Further, the present invention provides an aqueous solution by diluting the alkaline recovery agent with water, and applying or injecting the aqueous solution into the neutralized concrete molded body to infiltrate the neutralized concrete molded body. The present invention relates to a method for recovering alkalinity of a neutralized concrete molded body characterized by imparting alkalinity to a deep part inside the molded body.
先ず、本発明に係るアルカリ性回復剤（以下本発明のアルカリ性回復剤という）について説明する。本発明のアルカリ性回復剤に供するＡ成分は化１で示されるアミド化合物である。かかるアミド化合物としては、例えば、各種の脂肪酸にジエタノールアミンを反応させたアミド化物にエチレンオキサイドを付加したものが挙げられる。化１中のＲは炭素数７〜２１の飽和又は不飽和の脂肪族炭化水素基であり、かかる脂肪族炭化水素基を形成する脂肪酸の例としては、１)カプリル酸、カプリン酸、ラウリル酸、ミリスチン酸、パルミチン酸、ステアリン酸、アラキン酸、ベヘン酸等の飽和脂肪酸、及び２)オレイン酸、リノール酸等の不飽和脂肪酸が挙げられる。なかでもＲは炭素数１７の脂肪族不飽和炭化水素基が好ましく、かかる脂肪族不飽和炭化水素基を形成する脂肪酸としては、オレイン酸やリノール酸等の不飽和脂肪酸が挙げられる。また本発明において、脂肪酸とジエタノールアミンのアミド化物にエチレンオキサイドを付加してポリオキシエチレン基を形成するオキシエチレン単位の数であるｎ及びｍは、ｎ＋ｍが３〜１５の範囲、好ましくは４〜１２の範囲となる１以上の整数である。かかるＡ成分は一つ又は二つ以上を混合して用いることができる。 First, the alkaline recovery agent according to the present invention (hereinafter referred to as the alkaline recovery agent of the present invention) will be described. The A component used for the alkaline recovery agent of the present invention is an amide compound represented by Chemical Formula 1. Examples of such amide compounds include those obtained by adding ethylene oxide to amidated products obtained by reacting various fatty acids with diethanolamine. R in Chemical Formula 1 is a saturated or unsaturated aliphatic hydrocarbon group having 7 to 21 carbon atoms, and examples of fatty acids forming such aliphatic hydrocarbon groups are 1) caprylic acid, capric acid, lauric acid And saturated fatty acids such as myristic acid, palmitic acid, stearic acid, arachidic acid and behenic acid, and 2) unsaturated fatty acids such as oleic acid and linoleic acid. Among these, R is preferably an aliphatic unsaturated hydrocarbon group having 17 carbon atoms, and examples of the fatty acid that forms such an aliphatic unsaturated hydrocarbon group include unsaturated fatty acids such as oleic acid and linoleic acid. In the present invention, n and m, which are the number of oxyethylene units forming a polyoxyethylene group by adding ethylene oxide to an amidated product of fatty acid and diethanolamine, are in the range of n + m of 3 to 15, preferably 4 to 12 It is an integer greater than or equal to 1. Such A component can be used alone or in combination of two or more.
Ａ成分としての化１で示されるアミド化合物は公知の方法によって合成することができる。例えば、蒸留、滴下、撹拌機、温度制御等の計装設備を装備した反応缶に所定量のジエタノールアミン及び触媒（ナトリウムメトキシドのメタノール溶液）を仕込み、メタノールを蒸留により反応系外に除去した後、脂肪酸のメチルエステルを徐々に滴下しながら８５〜９５℃の温度下でエステル交換反応によるアミド化反応を完結させることによって、先ず脂肪酸とジエタノールアミンのアミド化物を得る。続いて、得られたアミド化物の所定量を触媒とともにオートクレーブに仕込み、エチレンオキサイドの所定量を加温、加圧下で付加反応させることによって、化１で示されるアミド化合物を得ることができる。 The amide compound represented by Chemical Formula 1 as the component A can be synthesized by a known method. For example, after charging a predetermined amount of diethanolamine and a catalyst (sodium methoxide in methanol) into a reaction can equipped with instrumentation equipment such as distillation, dripping, agitator, and temperature control, methanol is removed from the reaction system by distillation. First, an amidation product of fatty acid and diethanolamine is obtained by completing the amidation reaction by transesterification at a temperature of 85 to 95 ° C. while gradually dropping the methyl ester of the fatty acid. Subsequently, an amide compound represented by Chemical Formula 1 can be obtained by charging a predetermined amount of the obtained amidated compound together with a catalyst into an autoclave and subjecting the predetermined amount of ethylene oxide to heating and pressurization.
本発明のアルカリ性回復剤に供するＢ成分は炭酸カリウムであり、かかるＢ成分はＡ成分と併用したときに特異的に優れた効果を示す。 The B component used in the alkaline recovery agent of the present invention is potassium carbonate, and this B component exhibits a particularly excellent effect when used in combination with the A component.
本発明のアルカリ性回復剤は、以上説明したＡ成分とＢ成分から成るものであるが、Ａ成分を０．１〜６０質量％及びＢ成分を４０〜９９．９質量％（合計１００質量％）の割合で含有するものであり、好ましくはＡ成分を０．５〜３０質量％及びＢ成分を７０〜９９．５質量％（合計１００質量％）の割合で含有するものである。 The alkaline recovery agent of the present invention comprises the A component and the B component described above, but the A component is 0.1 to 60% by mass and the B component is 40 to 99.9% by mass (total 100% by mass). The component A is preferably contained in a proportion of 0.5 to 30% by mass and the component B in a proportion of 70 to 99.5% by mass (total 100% by mass).
本発明のアルカリ性回復剤を適用する中性化コンクリート成型体は、水、セメント、骨材、混和材等を含有する水硬性セメント組成物を硬化して得られる成型体であるが、なかでも本発明のアルカリ回復剤は、水／セメント比が５０〜８５％、好ましくは５５〜７５％の水硬性セメント組成物を硬化した低中強度領域の中性化鉄筋コンクリート成型体を対象にする場合に効果の発現が高い。 The neutralized concrete molded body to which the alkaline recovery agent of the present invention is applied is a molded body obtained by curing a hydraulic cement composition containing water, cement, aggregate, admixture, etc. The alkali recovery agent of the invention is effective when a neutralized reinforced concrete molded body in a low to medium strength region obtained by curing a hydraulic cement composition having a water / cement ratio of 50 to 85%, preferably 55 to 75% is used. Is highly expressed.
次に本発明に係る中性化コンクリート成型体のアルカリ性回復方法（以下本発明のアルカリ性回復方法という）について説明する。本発明のアルカリ性回復方法は、本発明のアルカリ性回復剤の水溶液を中性化コンクリート成型体の表面に塗布又は予め必要箇所に削った孔から注入し、中性化コンクリート成型体内部に浸透させ、中性化コンクリート成型体内部の深部にまでアルカリ性を付与する方法である。塗布又は注入に用いるアルカリ性回復剤の水溶液の濃度は、固形分換算濃度で、０．１〜４０質量％とするのが好ましく、１〜２０質量％とするのがより好ましい。また塗布する場合の塗布量は、水性液の状態で５０〜５００ｇ／ｍ２となるようにするのが好ましく、１００〜３５０ｇ／ｍ２となるようにするのがより好ましい。かかる塗布は、必要に応じ繰り返して行うことが好ましい。 Next, the method for recovering alkalinity of the neutralized concrete molding according to the present invention (hereinafter referred to as the alkalinity recovery method of the present invention) will be described. In the alkaline recovery method of the present invention, the aqueous solution of the alkaline recovery agent of the present invention is applied to the surface of the neutralized concrete molded body or injected from a hole that has been cut in advance at a required location, and penetrated into the neutralized concrete molded body, This is a method of imparting alkalinity to the deep part inside the neutralized concrete molded body. The concentration of the aqueous solution of the alkaline recovery agent used for coating or pouring is preferably from 0.1 to 40% by mass, more preferably from 1 to 20% by mass in terms of solid content. Moreover, it is preferable to make it the application amount in the case of apply | coating into the range of 50-500 g / m < 2 > in the state of an aqueous liquid, and it is more preferable to set it as 100-350 g / m < 2 >. Such coating is preferably repeated as necessary.
本発明のアルカリ性回復方法において、本発明のアルカリ性回復剤を塗布するか又は注入するかの選択は補修現場の実情によるが、通常は中性化コンクリート成型体の表面を傷つけずに簡便に補修作業が可能な観点から塗布する方法が好ましい。またアルカリ性回復剤の水溶液を塗布してアルカリ性回復剤を浸透させるための処理期間は、目的に応じて適宜選択するが、例えば数年間隔で行なわれる内部のアルカリ性維持のための定期的な処理に用いる場合には、アルカリ性回復剤の浸透深さが０．１〜２．０ｃｍとなることを要するため、その処理期間は１日〜３ヶ月が好ましく、また中性化コンクリート成型体内部に存在する鉄筋等の鋼材周辺までアルカリ性回復剤を浸透させる場合には、アルカリ性回復剤の浸透深さが２．０〜５．０ｃｍとなることを要するため、その処理期間は１日〜６ヶ月が好ましい。 In the alkaline recovery method of the present invention, the choice of whether to apply or inject the alkaline recovery agent of the present invention depends on the actual situation at the repair site, but usually the repair work can be easily performed without damaging the surface of the neutralized concrete molded body. The method of apply | coating from a viewpoint in which it is possible is preferable. In addition, the treatment period for applying the aqueous solution of the alkaline restoring agent and allowing the alkaline restoring agent to permeate is appropriately selected according to the purpose, but for example, a periodic treatment for maintaining the internal alkalinity performed every several years. When used, since the penetration depth of the alkaline recovery agent needs to be 0.1 to 2.0 cm, the treatment period is preferably 1 day to 3 months, and is present inside the neutralized concrete molded body. When the alkaline recovery agent is infiltrated to the vicinity of a steel material such as a reinforcing bar, the treatment period is preferably 1 day to 6 months because the penetration depth of the alkaline recovery agent needs to be 2.0 to 5.0 cm.
本発明のアルカリ回復剤が優れた効果を発揮する理由については明確でないが、以下の１）や２）等の理由によるものと推察される。すなわち、１）中性化コンクリート成型体に発生した水に不溶の炭酸カルシウムの蓄積層に対して、カルシウムよりイオン化傾向が高く水の溶解度が高いＢ成分の炭酸カリウムが他のアルカリ性物質よりも拡散して浸透し易く、また２）Ａ成分の脂肪酸とジエタノールアミンのアミド化物のエチレンオキサイド付加物は、水の表面張力を低下させると同時に、Ｂ成分の炭酸カリウムと併用したときに、カリウムイオンが中性化コンクリート成型体の深部にまで拡散して毛細管に浸透する性質を助長する作用効果に優れる等の理由が挙げられ、これらの相乗効果によって、本発明のアルカリ性回復剤はその浸透終了時において鉄筋に接触している領域のコンクリート成型体をｐＨが１１以上の鋼材が錆びないアルカリ環境条件にすることができる。 The reason why the alkali recovery agent of the present invention exhibits an excellent effect is not clear, but is presumed to be due to the following reasons 1) and 2). That is, 1) B-component potassium carbonate, which has a higher ionization tendency and higher water solubility than calcium, diffuses more than other alkaline substances in the water-insoluble calcium carbonate accumulation layer generated in neutralized concrete moldings. 2) The ethylene oxide adduct of a fatty acid of component A and an amidated product of diethanolamine lowers the surface tension of water, and at the same time, when used in combination with potassium carbonate of component B, potassium ions are contained inside. For example, the alkaline recovery agent of the present invention can be used as a reinforcing bar at the end of its penetration due to its synergistic effect. The concrete molded body in the area that is in contact with the steel can be made into an alkaline environment where steel with a pH of 11 or more does not rust. .
本発明において対象となる中性化コンクリート成型体には、コンクリートを使用した建築構造物の他に橋やダム等の土木構造物、コンクリート製の隔壁やオブジェ等の構造物が含まれる。 The neutralized concrete molding to be used in the present invention includes civil engineering structures such as bridges and dams, and concrete structures such as partition walls and objects, in addition to building structures using concrete.
本発明のアルカリ性回復方法では、本発明のアルカリ性回復剤の使用に際して、支障がない範囲で合目的的に他の剤を併用することができる。かかる他の剤としては、消泡剤、防腐剤、ｐＨの微調節のための苛性カリ等が挙げられる。 In the alkaline recovery method of the present invention, when the alkaline recovery agent of the present invention is used, other agents can be used in an appropriate manner as long as there is no problem. Examples of such other agents include antifoaming agents, preservatives, and caustic potash for fine adjustment of pH.
本発明によれば、本発明のアルカリ性回復剤は中性化コンクリート成型体への浸透性が極めて優れているため、塗布等の簡便な方法によって、中性化コンクリート成型体の表面層だけでなく深部にまでアルカリ性を回復させることができ、そのため、既存の建造物に定期的に塗布等を行なうことでコンクリート成型体中のアルカリ性環境が維持され、内部の鋼材の腐蝕による強度低下が効果的に抑制され、コンクリート成型体の耐久性を向上させることができる。 According to the present invention, since the alkaline recovery agent of the present invention has extremely excellent permeability to the neutralized concrete molded body, not only the surface layer of the neutralized concrete molded body by a simple method such as coating. Alkalinity can be restored to the deep part, so that the alkaline environment in the concrete molded body is maintained by regularly applying to existing buildings, etc., and the strength reduction due to corrosion of the internal steel material is effective It is suppressed and the durability of the concrete molding can be improved.
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（Ａ成分の合成）
・化１示されるアミド化合物（ａ−１）の合成
蒸留管、滴下管、撹拌羽根、温度調節器等の計装設備を装備した反応缶にジエタノールアミン２１００ｇ及び触媒としてナトリウムメトキシド（２８％メタノール溶液）２７ｇを仕込み、反応系を７５〜９０℃の温度に加温してメタノールを蒸留により反応系外に除去した。次にオレイン酸メチルエステル５９２０ｇを滴下管より３時間かけて徐々に添加しながら９０〜９５℃の反応温度でエステル交換反応させ、更に４時間熟成してアミド化反応を完結させて、脂肪酸とジエタノールアミンのアミド化物を得た。続いて、滴下管、撹拌羽根、温度調節等の計装設備を装備した５リットル容量のオートクレーブに、得られたアミド化物２６３５ｇ及び触媒として水酸化カリウム粉末８ｇを仕込み、撹拌しながら反応系を窒素置換した。続いて、反応系の温度を１２５〜１３５℃の温度に保ちながら、滴下管よりエチレンオキサイド５０５ｍｌを徐々に添加し、加圧下で付加反応させて、アミド化合物（ａ−１）３０８３ｇを合成した。
Test category 1 (synthesis of component A)
Synthesis of amide compound (a-1) represented by Chemical formula 2100 g of diethanolamine and sodium methoxide (28% methanol solution) as a catalyst in a reaction vessel equipped with instrumentation equipment such as a distillation tube, a dropping tube, a stirring blade and a temperature controller ) 27 g was charged, the reaction system was heated to a temperature of 75 to 90 ° C., and methanol was removed from the reaction system by distillation. Next, 5920 g of oleic acid methyl ester is gradually added over 3 hours from the dropping tube while performing transesterification at a reaction temperature of 90 to 95 ° C., and further aged for 4 hours to complete the amidation reaction, and fatty acid and diethanolamine The amidated product was obtained. Subsequently, 2635 g of the obtained amidated product and 8 g of potassium hydroxide powder as a catalyst were charged into a 5 liter autoclave equipped with instrumentation equipment such as a dripping pipe, a stirring blade, and temperature control, and the reaction system was stirred with nitrogen. Replaced. Subsequently, while maintaining the temperature of the reaction system at 125 to 135 ° C., 505 ml of ethylene oxide was gradually added from the dropping tube, followed by addition reaction under pressure to synthesize 3083 g of the amide compound (a-1).
・化１示されるアミド化合物（ａ−２）〜（ａ−８）及び比較のためのアミド化合物（ａｒ−１）〜（ａｒ−５）の合成
アミド化合物（ａ−１）と同様にして、表１に記載のアミド化合物（ａ−２）〜（ａ−８）及び（ａｒ−１）〜（ａｒ−５）を合成した。
Synthesis of amide compounds (a-2) to (a-8) shown in Chemical formula 1 and amide compounds (ar-1) to (ar-5) for comparison In the same manner as the amide compound (a-1), The amide compounds (a-2) to (a-8) and (ar-1) to (ar-5) described in Table 1 were synthesized.
表１において、
＊１：オレイン酸／リノール酸＝７０／３０（質量比）の混合物
In Table 1,
* 1: Mixture of oleic acid / linoleic acid = 70/30 (mass ratio)
試験区分２（アルカリ性回復剤の調製）
・実施例１：アルカリ性回復剤（Ｐ−１）の調製
Ａ成分として試験区分１で合成した化１で示されるアミド化合物（ａ−１）の４０％水溶液１０部及びＢ成分として炭酸カリウムの４０％水溶液１９０部を混合してアルカリ性回復剤（Ｐ−１）の４０％水溶液を調製した。
Test Category 2 (Preparation of alkaline recovery agent)
Example 1 Preparation of Alkaline Recovery Agent (P-1) 10 parts of a 40% aqueous solution of the amide compound (a-1) represented by Chemical Formula 1 synthesized in Test Category 1 as the A component and 40 parts of potassium carbonate as the B component A 40% aqueous solution of an alkaline recovery agent (P-1) was prepared by mixing 190 parts of a% aqueous solution.
・実施例２〜１１及び比較例１〜１７
同様にアルカリ性回復剤（Ｐ−２）〜（Ｐ−１１）及び（Ｒ−１）〜（Ｒ−１７）を調製した。各例のアルカリ性回復剤の内容を表２にまとめて示した。
-Examples 2-11 and Comparative Examples 1-17
Similarly, alkaline recovery agents (P-2) to (P-11) and (R-1) to (R-17) were prepared. Table 2 summarizes the contents of the alkaline recovery agent in each example.
表２において、
ａ−１〜ａ−８、ａｒ−１〜ａｒ−５：表１に記載した化１で示されるアミド化合物等
ｂ−１：炭酸カリウム
ｂ−２：炭酸ナトリウム
ｂ−３：炭酸リチウム
ｂ−４：亜硝酸ナトリウム
ｂ−５：珪酸ナトリウム
ｂ−６：アルミン酸ナトリウム
ｂ−７：水酸化リチウム
ａｒ−６：ラウリルトリメチルアンモニウムクロライド
ａｒ−７：オレイルアルコールのエチレンオキサイド（１０モル）付加物
＊２：１質量％濃度水溶液のｐＨ
In Table 2,
a-1 to a-8, ar-1 to ar-5: amide compounds represented by Chemical Formula 1 shown in Table 1 b-1: potassium carbonate b-2: sodium carbonate b-3: lithium carbonate b-4 : Sodium nitrite b-5: Sodium silicate b-6: Sodium aluminate b-7: Lithium hydroxide ar-6: Lauryltrimethylammonium chloride ar-7: Ethylene oxide (10 mol) adduct of oleyl alcohol * 2: PH of 1% strength by weight aqueous solution
試験区分３（コンクリート成型体の作製及びその中性化）
・コンクリート成型体の作製
表３に記載の配合条件で、練り混ぜ水（水道水）、普通ポルトランドセメント（密度＝３．１６ｇ／ｃｍ３）、細骨材（大井川水系産陸砂、密度＝２．５７ｇ／ｃｍ３、粗粒率＝２．７０）、粗骨材（岡崎産砕石、密度＝２．６８ｇ／ｃｍ３、実績率＝６０％）、ＡＥ減水剤（竹本油脂社製の商品名チューポールＥＸ２０）及びＡＥ調節剤（竹本油脂社製の商品名ＡＥ２００）の各所定量を５０リットルのパン型強制練りミキサーに投入して９０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ＡＥコンクリートを調製した。次に、このコンクリートを幅（横）１０ｃｍ、厚さ（縦）１０ｃｍ、長さ４０ｃｍの型枠に流し込み、硬化後に脱型してコンクリート成型体を作製した。
Test category 3 (Preparation of concrete molding and its neutralization)
・ Preparation of concrete moldings Under the mixing conditions shown in Table 3, kneaded water (tap water), ordinary Portland cement (density = 3.16 g / cm 3 ), fine aggregate (Oikawa water-based land sand, density = 2) .57 g / cm 3 , coarse particle rate = 2.70), coarse aggregate (Okazaki crushed stone, density = 2.68 g / cm 3 , actual rate = 60%), AE water reducing agent (trade name, manufactured by Takemoto Yushi Co., Ltd.) Each predetermined amount of Tupole EX20) and AE regulator (trade name AE200 manufactured by Takemoto Yushi Co., Ltd.) is put into a 50 liter pan-type forced kneading mixer and kneaded for 90 seconds. The target slump is 18 ± 1 cm and the target air amount is AE concrete having a range of 4.5 ± 1% was prepared. Next, the concrete was poured into a mold having a width (width) of 10 cm, a thickness (length) of 10 cm, and a length of 40 cm, and after the curing, the mold was removed to prepare a concrete molded body.
・コンクリート成型体の中性化
前記コンクリート成型体の中性化を図るため、該コンクリート成型体を二酸化炭素濃度５％のチャンバー内に静置した後、切断し、切断面にフェノールフタレインを吹き付けて、赤色化しない部分の表面からの中性化深さが約５０ｍｍに達するまで、中性化の促進を行なった。
・ Neutralization of concrete moldings In order to neutralize the concrete moldings, the concrete moldings were placed in a chamber with a carbon dioxide concentration of 5%, then cut, and phenolphthalein was sprayed onto the cut surfaces. Then, the neutralization was promoted until the neutralization depth from the surface of the portion that did not turn red reached about 50 mm.
試験区分４（中性化コンクリート成型体のアルカリ性回復処理及び評価）
アルカリ性回復処理を以下のように行なった。
・実施例１２
試験区分２で調製したアルカリ性回復剤の水溶液をいずれも固形分濃度７％になるよう水で希釈して濃度調整したものを、試験区分３で調製した中性化コンクリート成型体表面に塗布量が３００ｇ／ｍ２となるよう塗布した後、表面をポリエステルシートで被覆して、１３週間静置した。１３週間静置後、中性化コンクリート成型体を切断し、切断面にフェノールフタレイン溶液を吹き付け、呈色反応を確認したところ、深さ４１．５ｍｍまでｐＨが１１以上の領域が形成されていた。
Test Category 4 (Alkaline restoration treatment and evaluation of neutralized concrete moldings)
Alkaline recovery treatment was performed as follows.
Example 12
The aqueous solution of the alkaline recovery agent prepared in Test Category 2 was diluted with water to have a solid content concentration of 7%, and the concentration was applied to the surface of the neutralized concrete molded body prepared in Test Category 3. After applying to 300 g / m 2 , the surface was coated with a polyester sheet and allowed to stand for 13 weeks. After standing for 13 weeks, the neutralized concrete molded body was cut, and a phenolphthalein solution was sprayed on the cut surface to confirm a color reaction. As a result, a region having a pH of 11 or more was formed up to a depth of 41.5 mm. It was.
・実施例１３〜２２及び比較例１８〜３４
実施例１２と同様にして、実施例１３〜２２及び比較例１８〜３４のアルカリ性回復処理を行なった。
-Examples 13-22 and Comparative Examples 18-34
In the same manner as in Example 12, alkaline recovery treatment of Examples 13 to 22 and Comparative Examples 18 to 34 was performed.
アルカリ性回復処理の評価を以下のように行なった。結果を表４にまとめて示した。
・アルカリ性回復深さの測定：中性化コンクリート成型体の切断面にフェノールフタレインを吹き付けて赤色化した部分の表面からの深さを測定した。
・中性化領域のｐＨの測定：中性化コンクリート成型体の切断面にフェノールフタレインを吹き付けて赤色化しない部分と同じ深さの位置において、別に作製しておいた中性化コンクリート成型体から試料をサンプリングし、微粉砕したものの１０％水懸濁液のｐＨを測定した。
・アルカリ性回復領域のｐＨの測定：中性化コンクリート成型体の切断面にフェノールフタレインを吹き付けて赤色化した部分と同じ深さの位置において、別に作製しておいた中性化コンクリート成型体から試料をサンプリングし、微粉砕したものの１０％水懸濁液のｐＨを測定した。
The alkaline recovery treatment was evaluated as follows. The results are summarized in Table 4.
-Measurement of alkalinity recovery depth: The depth from the surface of the part which turned red by spraying phenolphthalein on the cut surface of the neutralized concrete molding was measured.
・ Measurement of pH in the neutralized zone: Neutralized concrete molded body prepared separately at the same depth as the part that does not turn red by spraying phenolphthalein on the cut surface of the neutralized concrete molded body A sample was sampled from 1 and the pH of a 10% aqueous suspension of the finely pulverized one was measured.
・ Measurement of pH in the alkaline recovery region: From the neutralized concrete molded body prepared separately at the same depth as the reddish part by spraying phenolphthalein on the cut surface of the neutralized concrete molded body The sample was sampled and finely ground, and the pH of a 10% aqueous suspension was measured.
表４からも明らかなように、本発明のアルカリ性回復剤を使用し、中性化コンクリート成型体のアルカリ性回復処理を行なうことによって、中性化コンクリート成型体の深部にまでｐＨが１１を超えるアルカリ性が付与されている。 As apparent from Table 4, by using the alkaline recovery agent of the present invention and carrying out the alkaline recovery treatment of the neutralized concrete molded body, the pH of the neutralized concrete molded body exceeds 11 to the deep part. Is granted.
Claims (7)
Ａ成分：下記の化１で示されるアミド化合物
ｎ，ｍ：ｎ＋ｍが３〜１５の範囲となる１以上の整数
Ｒ：炭素数７〜２１の飽和又は不飽和の脂肪族炭化水素基）
Ｂ成分：炭酸カリウム It consists of the following A component and B component, and comprises 0.1 to 60% by mass of the A component and 40 to 99.9% by mass (total 100% by mass) of the B component. An alkaline recovery agent for neutralized concrete moldings.
Component A: Amide compound represented by the following chemical formula 1
n, m: an integer of 1 or more where n + m is in the range of 3 to 15 R: a saturated or unsaturated aliphatic hydrocarbon group having 7 to 21 carbon atoms)
B component: Potassium carbonate
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