ZA200300162B - Waterproofed cementitious compositions and method of making same. - Google Patents
Waterproofed cementitious compositions and method of making same. Download PDFInfo
- Publication number
- ZA200300162B ZA200300162B ZA200300162A ZA200300162A ZA200300162B ZA 200300162 B ZA200300162 B ZA 200300162B ZA 200300162 A ZA200300162 A ZA 200300162A ZA 200300162 A ZA200300162 A ZA 200300162A ZA 200300162 B ZA200300162 B ZA 200300162B
- Authority
- ZA
- South Africa
- Prior art keywords
- weight
- group
- general formula
- carbon atoms
- alkoxysilane
- Prior art date
Links
- 239000000203 mixture Substances 0.000 title claims description 24
- 238000004519 manufacturing process Methods 0.000 title description 2
- 239000000463 material Substances 0.000 claims description 27
- 239000000839 emulsion Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 125000004432 carbon atom Chemical group C* 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 125000000217 alkyl group Chemical group 0.000 claims description 7
- 239000003995 emulsifying agent Substances 0.000 claims description 6
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 4
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 3
- 229910000077 silane Inorganic materials 0.000 claims description 3
- 229910020175 SiOH Inorganic materials 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 239000005864 Sulphur Substances 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 2
- 239000000945 filler Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 2
- -1 polysiloxane Polymers 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 125000004103 aminoalkyl group Chemical group 0.000 claims 1
- 239000004575 stone Substances 0.000 description 10
- 238000004078 waterproofing Methods 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical class [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- 239000005871 repellent Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- CEGOLXSVJUTHNZ-UHFFFAOYSA-K aluminium tristearate Chemical compound [Al+3].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CEGOLXSVJUTHNZ-UHFFFAOYSA-K 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000007787 solid 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
Description
" . WATERPROOFED CEMENTITIOUS COMPOSITIONS AND METHOD OF MAKING THE SAME
This invention relates to the waterproofing of porous cementitious materials and to admixtures for waterproofing.
Cementitious materials such as cement and concrete and various artificial building stones based on these are frequently made into walls, floors, roofs and the like, where they will be } exposed to water. As such materials are always inherently porous, water can penetrate them.
Although appropriate formulation can do much to reduce this inherent porosity, it can never completely get rid of it. There is therefore a substantial industry that seeks to provide waterproofing to such cementitious surfaces. Up to now, there have been two alternative methods, internal and external. The internal methods involved adding a waterproofing substance to a fluid cementitious mix before hardening. The materials that have been most commercially successful in this regard have been known water-repellent, fatty acid-based materials, typically stearates and oleates. However, relatively large quantities of such materials are needed.
The external treatments have involved coating the surface of the hardened cementitious material with a waterproofing substance. Such substances contain materials that are highly water repellent and are of low viscosity, to allow them to penetrate into the cementitions material. Particularly successful types of waterproofing materials are those based on organosilicon materials. Aqueous emulsions are most frequently encountered, but solvent- . based preparations and even organosilicon materials that are inherently sufficiently fluid have also been used. Multiple applications are needed for best effect, and the cost of applying such treatment to large structures can be very high. ] More recently, it has been proposed to add organosilicon materials as admixtures to cementitious mixes, in an attempt to utilise the good waterproofing properties of the surface- applied materials to the convenience of use of the stearates and oleates. The materials used have been aqueous hydrolysable silane emulsions.
It has now been found that it is possible to give hardened cementitious materials enhanced water impermeability by use of particular organosilicon materials. The invention therefore
CONFIRMATION COPY provides a method of conferring water impermeability on a hardened cementitious composition which is formed from a fluid cementitious mix, by the addition to the mix of an aqueous emulsion of organosilicon material, which material comprises from 0.25-4.5% by weight of the emulsion of an alkoxysilane and from 0.1-2.0% of an alkoxysiloxane.
The invention also provides a waterproof hardened cementitious composition comprising internally an alkoxysilane and an alkoxysiloxane, which had been added as an admixture to a cementitious mix from which the hardened composition was formed.
Although such emulsions are well known for external application to porous cementitious surfaces for waterproofing, it is surprising to find that, not only do they work when added to fluid mixes as admixtures, but they also work exceptionally well, better than the same material externally applied.
In a preferred embodiment of the invention (hereinafter "preferment 1"), the emulsion is one that contains ) 1. 0.25 to 2.5% by weight of an alkoxysilane of the general formula
R!-Si(OR?); I "wherein :
R; is an alkyl group with 3 to 12 carbon atoms; and
R; is a methyl or ethyl group; 2. 0.2 to 2% by weight of an alkoxysiloxane of the general formula
R,>-Si(OR™)
Osi)
. wherein R%is an alkyl group with 1 to 6 carbon atoms, ais 0.8to 1.2 and bis 0.2 to 1.2; and 3. water to 100%. - More preferably, some of the water may be replaced by from 0.001-0.5% by weight of an emulsifier, 0.001% by weight of filler with an effective surface area of at least 40M%/g.
In another preferred embodiment (hereinafter "preferment 2"), the emulsion contains a) 0.5 to 4.5% by weight of an alkoxysilane of the general formula
R'-Si~(OR?);3 wherein
R'is an alkyl group with 1 to 16 carbon atoms, and .
R? is an afkyl group with 1 to 4 carbon atoms, : b) 4.5 to 0.5% by weight of a mixture consisting of a bl) silane of the general formula
R>-Si-(OR%); wherein
R? has the meaning already given, and
Ris an aminoalky] group with 1 to 6 carbon atoms or a group of the general formula
Hz N-(CHo): R* -(CHa)y-,
in which R* represents an oxygen, sulphur, -NH- or -NH-CH,-CH,-NH group and x=2 and y=2, or a group of the general formula (R’0)s Si~(CHy)-NH-(CHa)x-, wherein R? and x are defined as above, 10 . - “CrHarO-CHoCHL CHa or ) 0 0 } -(CHy)s and nis a whole number from 1 to 5, and b2) is a polysiloxane of the general formula
R’
HO i H
RS wherein R is a methyl or phenyl group, with the proviso that at least 90% of the R’ groups are methyl groups, and m=20 to 250, 5 the ratio of bl to b2 being such that more than I and up to 3 OR? groups of compound bl correspond to one SiOH group of compound b2, c) 0.05 to 1% by weight of an O/W emulsifier or emulsifier mixture; and d) water to 100%.
Commercially-available materials suitable for preparing aqueous emulsions for use in this invention include products such as RHEOMIX® 790 ex Feb MBT. Such materials typically have solids contents of 30% or more and have to be diluted to make a composition for use in this invention.
The emulsions are added to a cementitious mix at a rate of from 0.1 - 2.0%, preferably from 0.5 — 1.5% by weight emulsion by weight of cement,
The hardened cementitious product containing the emulsion as admixture has a waterproofing performance that is noticeably superior to anything currently available.
The invention is further described by reference to the following non-limiting example.
The materials used are as follows:
A. commercially-available aluminium stearate.
B. RHEOMIX® 790 emulsion, applied by spraying, according to manufacturer's instructions,
C. RHEOMIX® 790, diluted by adding 9 parts of water to 1 part of emulsion (to give a material according to preferment 1 above), and added as an admixture to the mix.
~The test material is Lancaster stone, an architectural cast stone. All of A,B and C are tried on the stone, A and C being added to samples of the mix used to make the stone and B being applied to a sample of the hardened stone by spraying. The actual quantity of B is not precisely known, but it is sprayed according to the manufacturer's instructions, at a rate of about Sm*/L. The stone samples are then tested according to a number of recognised British
Standards. The results are as follows: (a) Capillary absorption test (BS 1217). The maximum allowable is 1.0mg/mm?.
A B C dosage (% by weight 1.8 NA BE ’ on cement) capillary 0.13 40 - 0.18 absorption (mg/mm?)
It can be seen that the performance according to the invention (C) is equivalent to that of the stearate (A), considering the lower quantity used, and much superior to that of the surface- applied siloxane B. (b) ISAT (Initial surface absorption) test. A maximum of 0.25ml/M*/10 min. according to
BS 1881, and 0.10mI/M%/60 min according to BS 1217 are allowed. (c) The same stone and the same admixtures in the same dosages were used. The results are as follows: 25 .
A B C
ISAT (10 min) 0.11 0.10 0
ISAT (60 min) 0.40 0.03 0
In this case, the stone according to the invention was superior to the stones which used stearate and sprayed siloxane.
Claims (5)
1. A method of conferring water impermeability on a hardened cementitious composition which is formed from a fluid cementitious mix, by the addition to the mix of an aqueous emulsion of organosilicon material, which material comprises from 0.25-4.5% by weight of the emulsion of an alkoxysilane and from 0.1-2.0% of an alkoxysiloxane.
2. A method according to claim 1 in which the emulsion is one which contains :
‘1. 0.25 to 2.5% by weight of an alkoxysilane of the general formula R! -Si(OR?); wherein R; is an alkyl group with 3 to 12 carbon atoms; and Rj; is a methyl or ethyl group;
2. 0.2 to 2% by weight of an alkoxysiloxane of the general formula
R.>-Si(OR%), Ouiain
2 . : wherein R%is an alkyl group with 1 to 6 carbon atoms, ais 0.8 to 1.2 and bis 0.2to 1.2; and
3. water to 100%. :
3. A method according to claim 1, in which the emulsion contains a) 0.5 to 4.5% by weight of an alkoxysilane of the general formula R!-Si-(OR%);, wherein R! is an alkyl group with 1 to 16 carbon atoms, and R? is an alkyl group with 1 to 4 carbon atoms, b) 4.5 to 0.5% by weight of a mixture consisting of a bl) silane of the general formula
R3.Si-(ORY); wherein R? has the meaning already given, and R® is an aminoalkyl group with 1 to 6 carbon atoms or a group of the general formula H, N-(CHo)x R* -(CHa)y-, in which R* represents an oxygen, sulphur, -NH- or -NH-CH,-CHo- NH group and x22 and y=2; or a group of the general formula (R’0)3 Si-(CHz)-NH~(CHz)s,
wherein R? and x are defined as above, Coar OCT CH. or : J 0) -(CHa)z and nis a whole number fromlto}, and b2) is a polysiloxane of the general formula RS : HO Sio H Rn wherein R® is a methyl or phenyl group, with the proviso that at least
90% of the R> groups are methyl groups, and m=20 to 250,
the ratio of bl to b2 being such that more than 1 and up to 3 OR? groups of compound b1 correspond to one SiOH group of compound b2, ¢) 0.05 to 1% by weight of an O/W emulsifier or emulsifier mixture; and
@) water to 100%.
4, A method according to any one of claims 1-3, in which some of the water is replaced by from 0.001-0.5% by weight of an emulsifier, 0.001% by weight of filler with an effective surface area of at least 40M/g.
5. A waterproof hardened cementitious composition comprising internally an alkoxysilane and an alkoxysiloxane which had been added to a cementitious mix from which the hardened composition was formed as an admixture by a method according to any one of claims 1-4. )
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB0111145.9A GB0111145D0 (en) | 2001-05-08 | 2001-05-08 | Admixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA200300162B true ZA200300162B (en) | 2004-03-10 |
Family
ID=9914166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA200300162A ZA200300162B (en) | 2001-05-08 | 2003-01-07 | Waterproofed cementitious compositions and method of making same. |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1390318A1 (en) |
| GB (1) | GB0111145D0 (en) |
| IL (1) | IL153588A (en) |
| NO (1) | NO20030070L (en) |
| WO (1) | WO2002090287A1 (en) |
| YU (1) | YU703A (en) |
| ZA (1) | ZA200300162B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8142856B2 (en) | 2005-07-15 | 2012-03-27 | Dow Corning Corporation | Hydrophobing minerals and filler materials |
| DE202008018525U1 (en) | 2008-12-19 | 2016-02-01 | Evonik Degussa Gmbh | Hydrophobic cementitious compositions |
| DE102008063965C5 (en) | 2008-12-19 | 2019-02-21 | Evonik Degussa Gmbh | Hydrophobic cementitious compositions |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0570203A (en) * | 1991-09-10 | 1993-03-23 | Shin Etsu Chem Co Ltd | Cement composition containing alkoxysilanes for extrusion molding |
| JPH0742180B2 (en) * | 1991-12-20 | 1995-05-10 | 東洋インキ製造株式会社 | Aqueous organosilicon composition |
| US5702509A (en) * | 1995-12-22 | 1997-12-30 | Minnesota Mining And Manufacturing Company | Masonry treatment composition |
| GB9605706D0 (en) * | 1996-03-19 | 1996-05-22 | Dow Corning | Method for hydrophobing gypsum |
| GB9614978D0 (en) * | 1996-07-17 | 1996-09-04 | Dow Corning | Gypsum mixture containing hydrophobic additive and method for hydrophobing gypsum |
| US6403163B1 (en) * | 2000-06-27 | 2002-06-11 | Chemrex, Inc. | Method of treating surfaces with organosilicon water repellent compositions |
-
2001
- 2001-05-08 GB GBGB0111145.9A patent/GB0111145D0/en not_active Ceased
-
2002
- 2002-05-03 EP EP02724306A patent/EP1390318A1/en not_active Withdrawn
- 2002-05-03 WO PCT/EP2002/004940 patent/WO2002090287A1/en not_active Application Discontinuation
- 2002-05-03 YU YU703A patent/YU703A/en unknown
- 2002-12-22 IL IL153588A patent/IL153588A/en not_active IP Right Cessation
-
2003
- 2003-01-07 ZA ZA200300162A patent/ZA200300162B/en unknown
- 2003-01-07 NO NO20030070A patent/NO20030070L/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| GB0111145D0 (en) | 2001-06-27 |
| NO20030070L (en) | 2003-03-10 |
| YU703A (en) | 2005-11-28 |
| EP1390318A1 (en) | 2004-02-25 |
| NO20030070D0 (en) | 2003-01-07 |
| IL153588A (en) | 2009-09-22 |
| IL153588A0 (en) | 2003-07-06 |
| WO2002090287A1 (en) | 2002-11-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0733607B1 (en) | Cationic emulsions of alkylalkoxysilanes | |
| US5110684A (en) | Masonry water repellent | |
| EP1294817B1 (en) | Organosilicon water repellent compositions | |
| AU594426B2 (en) | Aqueuos systems containing silanes | |
| EP0919526B1 (en) | Construction materials comprising hydrophobing powders containing organosilicon compounds | |
| AU693170B2 (en) | Amino and fluoro group containing siloxanes, ... etc. | |
| US5091002A (en) | Preparation for the water-repellent impregnation of porous mineral building materials | |
| US5074912A (en) | Siloxane masonry water repellent emulsions | |
| JP6087929B2 (en) | Water repellent for concrete | |
| US4717599A (en) | Water repellent for masonry | |
| AU8836298A (en) | Emulsions of organosilicon compounds for imparting water repellency to building materials | |
| JP4121042B2 (en) | Hydrophobic additive-containing gypsum mixture and process for producing hydrophobic gypsum mixture | |
| EP0796826A1 (en) | Method for hydrophobing gypsum | |
| EP2516354A1 (en) | Aqueous emulsions of alkylalkoxysilanes | |
| KR101963108B1 (en) | Process of preparing a siloxane copolymer | |
| ZA200300162B (en) | Waterproofed cementitious compositions and method of making same. | |
| US5086146A (en) | Methylalkoxy-methylalkyl cyclosiloxane copolymer | |
| WO2011131760A1 (en) | Polysiloxane-coated iron oxide pigments | |
| JPH101610A (en) | Aqueous organosilicon-based composition and civil engineering and construction material | |
| PL142911B1 (en) | Silicone based hydrophobizing and strenghtening agent for use in building trade,in particular for preservation of historical monuments | |
| CS207852B1 (en) | Method of hydrophobous treatment of the plasterstuffes and similar building materials | |
| PL167484B1 (en) | A method of obtaining organosilicon mortar, especially for plastering |