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A platform for research: civil engineering, architecture and urbanism
POWDER DRY SHRINKAGE REDUCTION AGENT FOR PREMIXED MORTAR, PREMIXED MORTAR AND CEMENT CURED BODY
PROBLEM TO BE SOLVED: To provide a powder dry shrinkage reduction agent for premixed mortar suppressing dry crack by exhibiting dry shrinkage reduction effects, having no reduction of frost damage resistance and without deterioration of durability of a concrete structure even in cold district.SOLUTION: There is provided a powder dry shrinkage reduction agent for premixed mortar which is a fine powder by absorbing a polyoxy alkylene derivative (b) which is represented by the formula [1] and liquid at 25°C to an organic fine powder (a) with mass ratio of the organic fine powder (a) and the polyoxy alkylene derivative (b), ((a):(b)) of 20:80 to 60:40. RO-(AO)n-R[1], where Ris a saturated hydrocarbon group having 12 to 30 carbon atoms, saturated hydrocarbon group having 18 to 22 carbon atoms in Ris 70 mass% or more, Rrepresents one or more kind selected from a group consisting of a hydrogen atom and a methyl group, the hydrogen atom in Ris 70 mass% or more, AO is an oxyalkylene group having 3 and 4 carbon atoms, n is average addition molar number of the oxyalkylene group and n=1 to 50.SELECTED DRAWING: None
【課題】乾燥収縮低減効果を発現することで乾燥ひび割れを抑制するとともに、耐凍害性が低下せず、寒冷地においてもコンクリート構造物の耐久性を損なわないプレミックスモルタル用粉体乾燥収縮低減剤を提供する。【解決手段】無機微粉末（ａ）に、式〔Ｉ〕で表される２５℃で液体のポリオキシアルキレン誘導体（ｂ）を吸着させた微粉末であり、前記無機微粉末（ａ）と前記ポリオキシアルキレン誘導体（ｂ）との質量比（（ａ）：（ｂ））が２０：８０〜６０：４０である、プレミックスモルタル用粉体乾燥収縮低減剤。Ｒ１Ｏ−（ ＡＯ ）ｎ−Ｒ２〔Ｉ〕（Ｒ１は、炭素数１２〜３０の飽和炭化水素基であり、Ｒ１のうち炭素数１８〜２２の飽和炭化水素基が７０質量％以上を占めており、Ｒ２は、水素原子およびメチル基からなる群より選ばれた一種以上を表し、Ｒ２のうち水素原子が７０質量％以上を占めており、ＡＯは炭素数３および４のオキシアルキレン基であり、ｎは前記オキシアルキレン基の平均付加モル数であり、ｎ＝１〜５０である。）【選択図】 なし
POWDER DRY SHRINKAGE REDUCTION AGENT FOR PREMIXED MORTAR, PREMIXED MORTAR AND CEMENT CURED BODY
PROBLEM TO BE SOLVED: To provide a powder dry shrinkage reduction agent for premixed mortar suppressing dry crack by exhibiting dry shrinkage reduction effects, having no reduction of frost damage resistance and without deterioration of durability of a concrete structure even in cold district.SOLUTION: There is provided a powder dry shrinkage reduction agent for premixed mortar which is a fine powder by absorbing a polyoxy alkylene derivative (b) which is represented by the formula [1] and liquid at 25°C to an organic fine powder (a) with mass ratio of the organic fine powder (a) and the polyoxy alkylene derivative (b), ((a):(b)) of 20:80 to 60:40. RO-(AO)n-R[1], where Ris a saturated hydrocarbon group having 12 to 30 carbon atoms, saturated hydrocarbon group having 18 to 22 carbon atoms in Ris 70 mass% or more, Rrepresents one or more kind selected from a group consisting of a hydrogen atom and a methyl group, the hydrogen atom in Ris 70 mass% or more, AO is an oxyalkylene group having 3 and 4 carbon atoms, n is average addition molar number of the oxyalkylene group and n=1 to 50.SELECTED DRAWING: None
【課題】乾燥収縮低減効果を発現することで乾燥ひび割れを抑制するとともに、耐凍害性が低下せず、寒冷地においてもコンクリート構造物の耐久性を損なわないプレミックスモルタル用粉体乾燥収縮低減剤を提供する。【解決手段】無機微粉末（ａ）に、式〔Ｉ〕で表される２５℃で液体のポリオキシアルキレン誘導体（ｂ）を吸着させた微粉末であり、前記無機微粉末（ａ）と前記ポリオキシアルキレン誘導体（ｂ）との質量比（（ａ）：（ｂ））が２０：８０〜６０：４０である、プレミックスモルタル用粉体乾燥収縮低減剤。Ｒ１Ｏ−（ ＡＯ ）ｎ−Ｒ２〔Ｉ〕（Ｒ１は、炭素数１２〜３０の飽和炭化水素基であり、Ｒ１のうち炭素数１８〜２２の飽和炭化水素基が７０質量％以上を占めており、Ｒ２は、水素原子およびメチル基からなる群より選ばれた一種以上を表し、Ｒ２のうち水素原子が７０質量％以上を占めており、ＡＯは炭素数３および４のオキシアルキレン基であり、ｎは前記オキシアルキレン基の平均付加モル数であり、ｎ＝１〜５０である。）【選択図】 なし
POWDER DRY SHRINKAGE REDUCTION AGENT FOR PREMIXED MORTAR, PREMIXED MORTAR AND CEMENT CURED BODY
プレミックスモルタル用粉体乾燥収縮低減剤、プレミックスモルタルおよびセメント硬化体
FUJII MOTOTAKA (author) / MATSUI TATSUYA (author)
2017-10-05
Patent
Electronic Resource
Japanese
IPC:
C04B
Kalk
,
LIME
/
C08K
Verwendung von anorganischen oder nichtmakromolekularen organischen Stoffen als Zusatzstoffe
,
USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS
/
C08L
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
,
Massen auf Basis makromolekularer Verbindungen
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