SE509143C2 - Agent for reducing shrinkage of cement material following drying - Google Patents
Agent for reducing shrinkage of cement material following dryingInfo
- Publication number
- SE509143C2 SE509143C2 SE9701302A SE9701302A SE509143C2 SE 509143 C2 SE509143 C2 SE 509143C2 SE 9701302 A SE9701302 A SE 9701302A SE 9701302 A SE9701302 A SE 9701302A SE 509143 C2 SE509143 C2 SE 509143C2
- Authority
- SE
- Sweden
- Prior art keywords
- reducing agent
- allyl ether
- shrink
- agent according
- shrinkage
- Prior art date
Links
- 239000004568 cement Substances 0.000 title claims abstract description 14
- 238000001035 drying Methods 0.000 title claims abstract description 5
- 239000000463 material Substances 0.000 title description 2
- ATVJXMYDOSMEPO-UHFFFAOYSA-N 3-prop-2-enoxyprop-1-ene Chemical compound C=CCOCC=C ATVJXMYDOSMEPO-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000000203 mixture Substances 0.000 claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 16
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- -1 trimethylolpropane diallyl ethers Chemical class 0.000 claims description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerol group Chemical group OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 6
- 239000004570 mortar (masonry) Substances 0.000 claims description 6
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- 150000002170 ethers Chemical class 0.000 claims description 5
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 3
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000004567 concrete Substances 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims description 3
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 3
- 239000011505 plaster Substances 0.000 claims description 3
- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 claims description 3
- 239000000654 additive Substances 0.000 description 10
- 229910052602 gypsum Inorganic materials 0.000 description 10
- 239000010440 gypsum Substances 0.000 description 10
- 230000000996 additive effect Effects 0.000 description 9
- 150000001298 alcohols Chemical class 0.000 description 8
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 150000004645 aluminates Chemical class 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910001653 ettringite Inorganic materials 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- LZDXRPVSAKWYDH-UHFFFAOYSA-N 2-ethyl-2-(prop-2-enoxymethyl)propane-1,3-diol Chemical compound CCC(CO)(CO)COCC=C LZDXRPVSAKWYDH-UHFFFAOYSA-N 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 229910052925 anhydrite Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 150000004677 hydrates Chemical class 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 150000005846 sugar alcohols Polymers 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- PTBDIHRZYDMNKB-UHFFFAOYSA-N 2,2-Bis(hydroxymethyl)propionic acid Chemical compound OCC(C)(CO)C(O)=O PTBDIHRZYDMNKB-UHFFFAOYSA-N 0.000 description 1
- WMYINDVYGQKYMI-UHFFFAOYSA-N 2-[2,2-bis(hydroxymethyl)butoxymethyl]-2-ethylpropane-1,3-diol Chemical compound CCC(CO)(CO)COCC(CC)(CO)CO WMYINDVYGQKYMI-UHFFFAOYSA-N 0.000 description 1
- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- DJOWTWWHMWQATC-KYHIUUMWSA-N Karpoxanthin Natural products CC(=C/C=C/C=C(C)/C=C/C=C(C)/C=C/C1(O)C(C)(C)CC(O)CC1(C)O)C=CC=C(/C)C=CC2=C(C)CC(O)CC2(C)C DJOWTWWHMWQATC-KYHIUUMWSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 1
- AWMVMTVKBNGEAK-UHFFFAOYSA-N Styrene oxide Chemical compound C1OC1C1=CC=CC=C1 AWMVMTVKBNGEAK-UHFFFAOYSA-N 0.000 description 1
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 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
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 125000001971 neopentyl group Chemical group [H]C([*])([H])C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/02—Alcohols; Phenols; Ethers
- C04B24/023—Ethers
-
- 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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
5ø9 143 12 2-5 viktsprocent räknat på nämnda klinkermaterial. Omedelbart efter vattentillsats sker en rad upplösnings- och hydratiseringsreaktioner som alla inte är helt klarlagda, En initial värmeutveckling sker från reaktion mellan trikalciumaluminat och gips, vilket leder till utfallning av ettringit (Ca6Al2[(OI-I)4SO4]3 - 26 H20 eller 3 CaO - Al2O3 - 3 CaSO4 - 32 H20) på trikalciumaluminatets ytor. Ettringiten är endast stabil så länge oreagerad gips finns närvarande i systemet. Ettringiten reagerar vidare, då gipsen är förbrukad, med oreagerad trikalciumaluminat och bildar monosulfatet 3 CaO - Al2O3 - CaSO4 - 12 H20. Trikalciumaluminatets reaktion med vatten sker omedelbart med kraftig värmeutveckling som följd. De därvid bildade metastabila hydraterna ombildas sedan till stabila hydrater. För att bromsa dessa snabba oönskade reaktioner blandas på nämnt sätt gips in. Den bildade ettringiten ger en skyddande hinna på trikalciumaluminatets ytor. Gipsen i sig verkar också delvis blockerande på trikalciumaluminatets hydratisering. 5ø9 143 12 2-5% by weight calculated on said clinker material. Immediately after water addition, a series of dissolution and hydration reactions take place, all of which are not completely clear. An initial heat development occurs from the reaction between tricalcium aluminate and gypsum, which leads to precipitation of ettringite (Ca6Al2 [(OI-I) 4SO4] 3 - 26 H CaO - Al2O3 - 3 CaSO4 - 32 H2O) on the surfaces of the tricalcium aluminate. Ettringite is only stable as long as unreacted gypsum is present in the system. Ettringite further reacts, when the gypsum is consumed, with unreacted tricalcium aluminate and forms the monosulphate 3 CaO - Al2O3 - CaSO4 - 12 H2O. The reaction of the tricalcium aluminate with water takes place immediately with strong heat development as a result. The metastable hydrates thus formed are then converted to stable hydrates. In order to slow down these rapid unwanted reactions, gypsum is mixed in as mentioned. The formed ettringite provides a protective film on the surfaces of the tricalcium aluminate. The gypsum itself also has a partial blocking effect on the hydration of the tricalcium aluminate.
Andra typer av torrbruk som frekvent används då till exempel uttorkningskrympning skall kontrolleras eller justeras med gipstillsats är aluminatcement med en aluminathalt av 35-50% och blandningar av aluminatcement och Portlandcement. Doseringen gips i bruk i förhållande till cement är oftast 1:2 till 1:3.Other types of dry mortar that are frequently used when, for example, drying shrinkage are to be checked or adjusted with gypsum additive are aluminate cement with an aluminate content of 35-50% and mixtures of aluminate cement and Portland cement. The dosage of gypsum in use in relation to cement is usually 1: 2 to 1: 3.
Inblandning av gips i ett torrbruk som redan innehåller en för brukaren ofta okänd eller dåligt definierad aluminat- och/eller gipshalt kräver således noggrann balansering mellan aluminat och gips. Genom användandet av ett krympreducerande tillsatsmedel med konstant sammansättning kan omfånget på variationerna minimerats. Ett tillsatsmedel av detta slag tillåter att tillverkning av torrbruk kan göras på ett mer rationellt sätt.Mixing gypsum in a dry mill that already contains an alumina and / or gypsum content, often unknown to the user or poorly defined, thus requires careful balancing between aluminate and gypsum. By using a shrink-reducing additive with a constant composition, the scope of the variations can be minimized. An additive of this kind allows the manufacture of dry mills to be done in a more rational way.
Olika försök har utan framgång gjorts att ändra brukskompositionerna i sig i avsikt att minimera krympningsproblem. Det är även känt från bland annat ett antal publikationer, såsom EP 308950, EP 479000, EP 573036, JP 48043010, JP 59128240 och JP 59131552 att använda till exempel alkoholer, såsom sekundära och tertiära polyalkoholer, alkandioler, acetyleniska dioler samt polyvinylalkohol, eventuellt tillsammans med ett fluorinnehållande ytaktivt medel och/eller en kiselsyra som krympreducerande tillsatser i bruksblandningar. Vidare är det från den tyska patentansökan DE 3245843 känt att använda polyalkoholer som malningshjälpmedel.Various attempts have been made without success to change the use compositions themselves in order to minimize shrinkage problems. It is also known from a number of publications, such as EP 308950, EP 479000, EP 573036, JP 48043010, JP 59128240 and JP 59131552 to use for example alcohols, such as secondary and tertiary polyalcohols, alkanediols, acetylenic diols and polyvinyl alcohol, optionally together with a non-containing surfactant and / or a silicic acid as shrink-reducing additives in use mixtures. Furthermore, it is known from German patent application DE 3245843 to use polyalcohols as grinding aids.
Det har genom föreliggande uppfinning helt överraskande visat sig att allyletrar av tri- och polyfunktionella alkoholer vad gäller krympreducerande effekt är överlägsna motsvarande icke-allylerade alkoholer. Det krympreducerande medlet 93 “i 509 143 enligt föreliggande uppfinning uppvisar en kraftig krympreduktion vid uttorkning både i förhållande till nämnda alkoholer och till en referens helt utan tillsats av medlet enligt uppfinningen och/eller motsvarande icke-allylerade alkohol.It has been surprisingly found by the present invention that allyl ethers of tri- and polyfunctional alcohols in terms of shrink-reducing effect are superior to non-allylated alcohols. The shrink-reducing agent 93 "in 509 143 according to the present invention shows a strong shrinkage reduction on drying both in relation to said alcohols and to a reference completely without addition of the agent according to the invention and / or corresponding non-allylated alcohol.
Medlet enligt föreliggande uppfinning är avsett för cementinnehållande, vattenhaltiga kompositioner, såsom betong, puts, bruk, spackel, flytspackel och avjämningsmassor och innefattar, företrädesvis i en halt av 1-99, såsom 40-99 eller 50-99 viktsprocent, minst en partiell allyleter av en tri- eller polyfunktionell alkohol, vilken allyleter har minst en icke-allylerad hydroxylgrupp samt företrädesvis en vattenlöslighet av minst 0,2%, såsom minst 0,5 eller 1,0%.The composition of the present invention is intended for cementitious aqueous compositions, such as concrete, plaster, mortar, putty, putty and leveling compounds, and comprises, preferably in a content of 1-99, such as 40-99 or 50-99% by weight, at least one partial allyl ether. of a tri- or polyfunctional alcohol, which allyl ether has at least one non-allylated hydroxyl group and preferably a water solubility of at least 0.2%, such as at least 0.5 or 1.0%.
Allyletern är i föredragna utföringsformer en mono- och/eller diallyleter av en triol, såsom en trimetylol Cl-Cs alkan. Alternativt kan en di- och/eller triallyleter av en tetrol ingå i medlet. Nämnda trimetylol Cl-Cs alkan kan lämpligen exemplifieras med trimetyloletan och trimetylolpropan. Ytterligare lämpliga alkoholer innefattar ditrimetylolpropan, ditrimetyloletan, pentaerytritol, dipentaerytritol och liknande alkoholer företrädesvis med neopentylstruktur. Även allylerade karboxylfunktionella alkoholer såsom den trifunktionella dimetylolpropionsyran, vilken har en karboxylgrupp och två hydroxylgrupper, kan som allyleter och/eller allylester ingå i medlet enligt uppfinningen. Vidare kan allyletern vara en allyleter av en alkoxylerad tri- eller polyfunktionell alkohol eller en alkoxylerad allyleter av en tri- eller polyfunktionell alkohol, varvid alkoxylatet lämpligen framställs genom reaktion mellan hydroxylgrupper i alkoholen eller allyletern och en alkoxylenoxid, såsom etylenoxid och/eller propylenoxid samt i speciella fall eventuellt butylenoxid eller fenyletylenoxid. Medlet enligt uppfinningen innefattar i sina mest föredragna utföringsformer minst en partiell allyleter, såsom en mono- eller diallyleter av glycerol, trimethyloletan och/eller trimetylolpropan eller såsom en di- eller triallyleter av pentaerytritol.The preferred allyl ether is in preferred embodiments a mono- and / or diallyl ether of a triol, such as a trimethylol C1-C8 alkane. Alternatively, a di- and / or triallyl ether of a tetrol may be included in the composition. Said trimethylol C1-C8 alkane can be suitably exemplified by trimethylolethane and trimethylolpropane. Further suitable alcohols include ditrimethylolpropane, ditrimethylolethane, pentaerythritol, dipentaerythritol and similar alcohols preferably having a neopentyl structure. Also allylated carboxyl-functional alcohols such as the trifunctional dimethylolpropionic acid, which has one carboxyl group and two hydroxyl groups, can be included as allyl ether and / or allyl ester in the composition according to the invention. Furthermore, the allyl ether may be an allyl ether of an alkoxylated tri- or polyfunctional alcohol or an alkoxylated allyl ether of a tri- or polyfunctional alcohol, the alkoxylate being suitably prepared by reaction between hydroxyl groups in the alcohol or allyl ether and an alkoxylene oxide such as ethylene oxide and / or propylene oxide. special cases possibly butylene oxide or phenylethylene oxide. The agent of the invention in its most preferred embodiments comprises at least one partial allyl ether, such as a mono- or diallyl ether of glycerol, trimethylolethane and / or trimethylolpropane or as a di- or triallyl ether of pentaerythritol.
Allyletrar är väl kända produkter och beskrivs, vad gäller tillverkning och egenskaper, utförligt i bland annat Kirk-Ottmer "Encyclopedia of Chemical Technology", John Wiley and Sons Ltd. 1978, vol. 2, "Allyl Compounds" sid. 97-108 och “Allyl Monomers and Polymers" sid. 109-128.Allyl ethers are well-known products and are described, in terms of manufacture and properties, in detail in, among others, Kirk-Ottmer "Encyclopedia of Chemical Technology", John Wiley and Sons Ltd. 1978, vol. 2, "Allyl Compounds" p. 97-108 and "Allyl Monomers and Polymers" pp. 109-128.
Flytande allyletrar av tri- och polyfunktionella alkoholer kan enligt föreliggande uppfinning med fördel ingå i ett pulverformigt krympreducerande medel. Medlet framställas därvid genom att en bärare bestående av minst en pulverformig amorf kiselsyra blandas med allyletern, varvid halten kiselsyra lämpligen är l-50, företrädesvis 10-40, viktsprocent av blandningen. 509 145 045 Föreliggande uppfinning avser i en vidare aspekt användning av det krympreducerande medlet i en cementinnehållande, vattenhaltig komposition, såsom betong, puts, bruk, spackel, flytspackel och avjämningsmassor, varvid medlet enligt uppfinningen tillsätts kompositionen i en halt av 0,1-20, företrädesvis 1-10 eller 2-5, viktsprocent räknat på ingående mängd torr cement.According to the present invention, liquid allyl ethers of tri- and polyfunctional alcohols can advantageously be included in a powdered shrink-reducing agent. The agent is then prepared by mixing a carrier consisting of at least one powdered amorphous silicic acid with the allyl ether, the silicic acid content suitably being 1-50, preferably 10-40, weight percent of the mixture. The present invention relates in a further aspect to the use of the shrink-reducing agent in a cementitious aqueous composition, such as concrete, plaster, mortar, putty, surface putty and leveling compounds, the agent according to the invention being added to the composition in a content of 0.1-20. , preferably 1-10 or 2-5, weight percent based on the constituent amount of dry cement.
Dessa och andra aspekter av och fördelar med föreliggande uppfinning belyses ytterligare genom nedan detaljerade beskrivning i form av utföringsexempel l-4.These and other aspects and advantages of the present invention are further illustrated by the following detailed description in the form of Embodiments 1-4.
Föredragna utföringsformer av uppfinningen visas, men detta avser givetvis inte att begränsa uppfinning därtill och det förstås att denna innefattar modifieringar som omfattas av de efterföljande patentkraven.Preferred embodiments of the invention are shown, but this is of course not intended to limit the invention thereto, and it is to be understood that this includes modifications which are covered by the appended claims.
Exempel 1-4 avser: Exempel 1: Tillverkning av en cementbaserad bruksblandning enligt EN 196-l.Examples 1-4 relate to: Example 1: Manufacture of a cement-based mortar mixture according to EN 196-1.
Bruksblandningen är en referensblandning utan krympreducerande tillsats.The use mixture is a reference mixture without shrink-reducing additive.
Exempel 2: Ett krympreducerande medel. jämförelseexempel varvid trimetylolpropan används som Exempel 3: Tillsats av ett krympreducerande medel enligt föreliggande uppfinning. Medlet består av av trimetylolpropanmonoallyleter.Example 2: A shrinkage reducing agent. Comparative Example using trimethylolpropane as Example 3: Addition of a shrink reducing agent of the present invention. The composition consists of trimethylolpropane monoallyl ethers.
Exempel 4: Tillverkning av ett pulverformigt krympreducerande medel, enligt föreliggande uppfinning, bestående av trimetylolpropanmonoallyleter och en amorf kiselsyra.Example 4: Preparation of a powdered shrink reducing agent, according to the present invention, consisting of trimethylolpropane monoallyl ether and an amorphous silicic acid.
Exempel 1 (referens exempel) En referensblandning utan krympreducerande tillsats blandades.Example 1 (Reference Example) A reference mixture without shrinkage reducing additive was mixed.
En cementbaserad bruksblandning enligt EN 196-1 tillverkades i en Hobartblandare. Blandningen innehöll 225 g vatten, 450 g standard Portlandcement och 1350 g CEN-sand. Vatten vägdes upp, varefter cementen under 30 sekunder tillsattes under omrörning på hastighet 1 varefter sanden tillsattes under de följande 30 sekunderna. Omrörningen fortsatte därefter under 150 sekunder vid hastighet 2. Efter 90 sekunders vila omrördes blandningen under ytterligare 60 sekunder vid hastighet 2. Den totala blandnings/omrörningstiden blev 4 minuter.A cement-based mortar mixture according to EN 196-1 was manufactured in a Hobart mixer. The mixture contained 225 g of water, 450 g of standard Portland cement and 1350 g of CEN sand. Water was weighed, after which the cement was added for 30 seconds with stirring at speed 1, after which the sand was added for the following 30 seconds. Stirring was then continued for 150 seconds at rate 2. After 90 seconds of rest, the mixture was stirred for an additional 60 seconds at rate 2. The total mixing / stirring time was 4 minutes.
Efter blandningen tillverkades 4 provkroppar, med dimensionen 250 x 25 x 25 mm, för mätning av uttorkningskrympning. Provkropparna fick hârda i luft vid 20°C och 5 ” 509 1450 100% relativ fuktighet och avformades efter 24 timmar, varefter ett initialvärde för längdmätning noterades.After mixing, 4 specimens, measuring 250 x 25 x 25 mm, were made to measure desiccation shrinkage. The specimens were cured in air at 20 ° C and 5 ”509 1450 100% relative humidity and demolded after 24 hours, after which an initial value for length measurement was noted.
Lagring skedde vid 20°C och 50% relativ fuktighet. Längdmätningar utfördes efter 21 och 49 dygns lagring efter den initiala mätningen.Storage took place at 20 ° C and 50% relative humidity. Length measurements were performed after 21 and 49 days of storage after the initial measurement.
Uttorkningskrympningen i promille av initialvärdet redovisas i tabellen nedan.The dehydration shrinkage in per mille of the initial value is reported in the table below.
Lagring, dygn Krympning, %o 21 0,805 49 0,93 7 Exempel 2 (jämförelse exempel) En blandning med trimetylolpropan (TMP) som krympreducerande tillsats blandades enligt exempel 1. Den krympreducerande tillsatsen blandades i vattnet.Storage, day Shrinkage,% o 21 0.805 49 0.93 7 Example 2 (Comparative Example) A mixture with trimethylolpropane (TMP) as a shrink-reducing additive was mixed according to Example 1. The shrink-reducing additive was mixed in the water.
Doseringen var 1 respektive 3 viktsprocent trimetylolpropan (TMP) baserat på cementvikten.The dosage was 1 and 3 weight percent trimethylolpropane (TMP), respectively, based on the cement weight.
Tillverkning av provkroppar, lagring och längdmätning skedde enligt exempel l.Sample production, storage and length measurement took place according to Example 1.
Uttorkningskrympningen i promille av initialvärdet redovisas i tabellen nedan.The dehydration shrinkage in per mille of the initial value is reported in the table below.
Lagring, dygn 1% TMP - Krympning, %o 3% TMP - Krympning, %o 21 0,83 0,765 49 1,029 0,804 Exempel 3 En blandning med trimetylolpropanmonoallyleter som krympreducerande tillsats blandades enligt exempel 1. Den krympreducerande tillsatsen blandades i vattnet.Storage, day 1% TMP - Shrinkage,% o 3% TMP - Shrinkage,% o 21 0.83 0.765 49 1.029 0.804 Example 3 A mixture with trimethylolpropane monoallylates as a shrink-reducing additive was mixed according to Example 1. The shrink-reducing additive was mixed in the water.
Doseringen var 3 viktsprocent trimetylolpropanmonoallyleter baserat på cementvikten.The dosage was 3% by weight of trimethylolpropane monoallylates based on the cement weight.
Tillverkning av provkroppar, lagring och längdmätning skedde enligt exempel 1 med skillnaden att längdmätning skedde vid 21 och 70 dygns lagring i stället för 21 och 49 dygns lagring. 509 143 6 Uttorkningskrympningen i promille av initialvärdet redovisas i tabellen nedan.Sample production, storage and length measurement took place according to Example 1, with the difference that length measurement took place at 21 and 70 days of storage instead of 21 and 49 days of storage. 509 143 6 The dehydration shrinkage in per mille of the initial value is reported in the table below.
Lagring, dygn Krympning, %o 21 0.465 70 0.577 Exempel 4 Ett pulverformigt krympreducerande medel tillverkades genom att 70 viktsprocent trimetylolpropanmonoallyleter och 30 viktsprocent amorf kiselsyra blandades.Storage, day Shrinkage,% o 21 0.465 70 0.577 Example 4 A powdery shrink reducing agent was prepared by mixing 70% by weight of trimethylolpropane monoallyl ethers and 30% by weight of amorphous silicic acid.
Vid en tillsats av det krympreducerande medlet motsvarande 3 viktsprocents tillsats av trimetylolpropanmonoallyleter gav resultat i enlighet med de i exempel 3 erhållna.Upon addition of the shrinkage agent corresponding to 3% by weight addition of trimethylolpropane monoallyl ether gave results in accordance with those obtained in Example 3.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9701302A SE509143C2 (en) | 1997-04-09 | 1997-04-09 | Agent for reducing shrinkage of cement material following drying |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9701302A SE509143C2 (en) | 1997-04-09 | 1997-04-09 | Agent for reducing shrinkage of cement material following drying |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| SE9701302D0 SE9701302D0 (en) | 1997-04-09 |
| SE9701302L SE9701302L (en) | 1998-10-10 |
| SE509143C2 true SE509143C2 (en) | 1998-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE9701302A SE509143C2 (en) | 1997-04-09 | 1997-04-09 | Agent for reducing shrinkage of cement material following drying |
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| Country | Link |
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| SE (1) | SE509143C2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007018455A1 (en) * | 2005-08-11 | 2007-02-15 | Perstorp Specialty Chemicals Ab | Process for allylation of mixed polyhydric compounds |
-
1997
- 1997-04-09 SE SE9701302A patent/SE509143C2/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007018455A1 (en) * | 2005-08-11 | 2007-02-15 | Perstorp Specialty Chemicals Ab | Process for allylation of mixed polyhydric compounds |
Also Published As
| Publication number | Publication date |
|---|---|
| SE9701302L (en) | 1998-10-10 |
| SE9701302D0 (en) | 1997-04-09 |
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| NUG | Patent has lapsed |