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Publication numberUS20020189500 A1
Publication typeApplication
Application numberUS 10/090,338
Publication dateDec 19, 2002
Filing dateMar 4, 2002
Priority dateMar 2, 2001
Also published asCA2439425A1, CA2439425C, CA2439451A1, CA2439484A1, CA2439484C, CA2439508A1, CA2439513A1, CA2439513C, CN1243615C, CN1254352C, CN1494463A, CN1494473A, CN1498162A, CN1500038A, CN1612847A, CN100391883C, DE60222245D1, DE60222245T2, DE60235531D1, EP1370369A1, EP1370369A4, EP1370369B1, EP1370401A1, EP1370401A4, EP1372952A1, EP1372952A4, EP1373157A2, EP1373157A4, EP1377440A1, EP1377440A4, EP1377440B1, US6692570, US6749897, US6824715, US6893751, US7396402, US7704316, US8153245, US20020170466, US20020170467, US20020175126, US20020179219, US20020179220, US20020189499, US20020192510, US20030000424, US20030070615, US20030165624, US20050208287, US20070077436, US20100124860, WO2002070145A1, WO2002070218A1, WO2002070247A1, WO2002070421A2, WO2002070421A3
Publication number090338, 10090338, US 2002/0189500 A1, US 2002/189500 A1, US 20020189500 A1, US 20020189500A1, US 2002189500 A1, US 2002189500A1, US-A1-20020189500, US-A1-2002189500, US2002/0189500A1, US2002/189500A1, US20020189500 A1, US20020189500A1, US2002189500 A1, US2002189500A1
InventorsBasil Naji, Milton O'Chee
Original AssigneeBasil Naji, O'chee Milton
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Additive for dewaterable slurry
US 20020189500 A1
Abstract
An additive for a cementitious slurry comprising fly ash having a predominant particle size of up to about 10 microns, and/or aluminous material having a predominant particle size of up to about 150 microns. The additive acts as a water reduction agent and can replace either wholly or partially a conventional plasticiser.
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Claims(12)
What is claimed is:
1. An additive for a cementitious slurry, comprising a mineral component selected from the group consisting of:
(i) fly ash having a predominant particle size of up to about 10 microns;
(ii) aluminous material having a predominant particle size of up to about 150 microns; and
(iii) both the fly ash of (i) and the aluminous material of (ii).
2. An additive according to claim 1, wherein the fly ash comprises about 25-60% silica, about 10-30% Al2 O3, about 5-25% Fe2O3 up to about 20% CaO and up to about 5% MgO.
3. An additive according to claim 1, wherein the fly ash comprises about 30-100 wt % based on weight of cement in the slurry.
4. An additive according to any one of claim 1, wherein the aluminous material is selected from the group consisting of hydrated alumina, partially hydrated alumina and unhydrated alumina.
5. An additive according to claim 1, wherein the aluminous material comprises between about 5 to 30 wt % based on weight of cement in the slurry.
6. An additive according to claim 1, wherein the ratio of hydrated alumina to fly ash is between about 1:1 and 1:10.
7. An additive according to claim 1, wherein the slurry contains a conventional plasticiser
8. An additive according to claim 7 wherein the amount of conventional plasticiser is between about 0.3 and 3 wt % based on weight of the dry cement.
9. An additive according to claim 1, wherein the cementitious slurry contains about 5 to 30 wt % of fillers.
10. An additive according to claim 1, wherein the mineral component is fly ash having a predominant particle size of up to about 10 microns.
11. An additive according to claim 1, wherein the mineral component is aluminous material having a predominant particle size of up to about 150 microns.
12. An additive according to claim 1, wherein the mineral component includes both the fly ash of (i) and the aluminous material of (ii).
Description
    PRIORITY CLAIM
  • [0001]
    This application claims priority from the following Australian provisional patent applications, the full contents of which are hereby incorporated by cross-reference.
    Application No Title Date Filed
    PR3474 A Composite Product 2 Mar. 2001
    PR3475 Spattering Apparatus 2 Mar. 2001
    PR3476 Additive for a Dewaterable Slurry 2 Mar. 2001
    PR3477 A Method and Apparatus for Forming a 2 Mar. 2001
    Laminated Sheet Material by Spattering
    PR3478 Coatings for Building Products 2 Mar. 2001
  • BACKGROUND OF THE INVENTION
  • [0002]
    1. Field of the Invention
  • [0003]
    The present invention relates to admixtures for slurries and in particular cementitious slurry compositions.
  • [0004]
    2. Description of the Related Art
  • [0005]
    As is well known in the art, most cementitious compositions are laid down or used in a slurry form. Increasing difficulty and expense in obtaining high quality aggregate for use in such cementitious material such as concrete has forced manufacturers to resort to low grade materials such as crushed stone, marine sand and even recycled crushed concrete obtained from demolitions or old structures. This leads to problems with the concrete such as a higher water demand, bleeding (where, as the slurry settles, water migrates to the surface), lower workability and pumpability.
  • [0006]
    In the past, these problems have been overcome by the addition of certain additives to the cementitious composition. These plasticisers, sometimes known as water reducers, dispersion agents or super plasticisers, act to increase the workability and validity of the slurry for a given quantity of water. Examples include lignosulphonates, naphthalene sulphonate-formaldehyde condensates.
  • [0007]
    Typically, these water reducers are added at around 0.3% by weight of cement and provide between 8 and 12% reduction in the water cement ratio, depending upon the addition procedure. Additions of up to 1% by cement provide up to 35% reduction in the water to cement ratio. In high performance concrete application, eg ultra high strength concrete, it is common to overdose in plasticiser/water reducer, (or combinations thereof) to obtain further water reduction of up to 50%. However, at such dosage levels detrimental effects are produced, eg setting times increased and compressive strength of a cementitious mixture reduced.
  • [0008]
    It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.
  • SUMMARY OF THE INVENTION
  • [0009]
    In a broad aspect, the present invention provides an additive for a cementitious slurry comprising of one or both of the following mineral components:
  • [0010]
    i) fly ash having a predominant particle size of up to about 10 microns, and
  • [0011]
    ii) aluminous material having a predominant particle size of up to about 150 microns.
  • [0012]
    The applicants have found that use of the small particle size fraction fly ash or large particle size fraction aluminous material acts as an efficient water reducer for cementitious slurries. The applicants have found that addition of a suitable quantity of such a mineral additive indeed provides a substantial reduction in water required to maintain a predetermined viscosity without any of the aforementioned detrimental effects arising from conventional techniques. The aforementioned additive does not significantly increase set times or cause excessive aeration, which can be a major problem with some known admixtures. Further, it inhibits bleeding and improves workability.
  • [0013]
    In a preferred embodiment, the aforementioned mineral additive can be used in combination with a conventional water reducer/plasticiser to enhance the water reduction capabilities of such a conventional additive.
  • [0014]
    In a second aspect, the present invention provides a cementitious slurry comprising an hydraulic binder, water, a plasticiser and a mineral additive including one or both of the following components:
  • [0015]
    i) fly ash having a predominant particle size of up to about 10 microns,
  • [0016]
    ii) aluminous material having a predominant particle size of up to about 150 microns, and the mineral additive being added in a quantity sufficient to provide a water reduction effect.
  • [0017]
    In a third aspect, the present invention provides a method of reducing the water requirements of a cementitious slurry comprising adding an effective amount of one or both of the following mineral components: i) fly ash having a predominant particle size of up to about 10 microns, and ii) aluminous material having a predominant particle size of up to about 150 microns.
  • [0018]
    In a fourth aspect, the present invention provides a method of improving the properties of a cementitious slurry comprising adding an effective amount of one or both of the following mineral components: i) fly ash having a predominant particle size of up to about 10 microns, and ii) aluminous material having a predominant particle size of up to about 150 microns.
  • [0019]
    The reference to water reduction effect relates to the ability of the mineral additive to effectively reduce the quantity of water required to obtain a particular viscosity. As will be clear to persons skilled in the art, for certain applications, a slurry is designed to have a particular predetermined viscosity for flowability, pumpability or application reasons. The mineral additive described above provides excellent water reduction properties for a slurry. As discussed, it can be used on its own to provide water reduction to the slurry or in combination with a conventional plasticiser/water reducer.
  • [0020]
    When used in combination with an amount of conventional plasticiser/water reducer, it has been found that the aforementioned mineral additive enhances the water reduction properties of the slurry as will be discussed below.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • [0021]
    The preferred embodiments of the present invention relate to the use of a mineral additive to manufacture and improve the properties of a cementitious slurry. More preferably, one or both of the following mineral additives may be used: i) fly ash having a predominant particle size of up to about 10 microns, and ii) aluminous material having a predominant particle size of up to about 150 microns.
  • [0022]
    The fly ash in the mineral additive refers to fly ash with a predominant particle size of up to about 10 microns. As will be clear to persons skilled in the art, fly ash is a solid powder having a chemical composition similar to or the same as the composition of material that is produced during the combustion of powdered coal. The composition typically comprises about 25 to 60% silica, about 10 to 30% Al2 O3, about 5 to 25% Fe2O3, up to about 20% CaO and up to about 5% MgO.
  • [0023]
    Fly ash particles are typically spherical and range in diameter from about 1 to 100 microns. It is the smaller size fraction of fly ash particles with a predominant size below about 10 microns that has surprising water reduction properties.
  • [0024]
    The fly ash preferably makes up about 30-100% based on weight of cement. Preferably, the fly ash is between about 40 and 90% and most preferably about 50 to 70% based on weight of cement.
  • [0025]
    Larger size fly ash particles have been known in the past to provide a water reduction effect. Smaller size particles, however, have always been considered unsuitable for water reduction for a few reasons. Firstly, it is expected in the art that the smaller the particle size, the more reactive the particle. Fly ash is a reactive pozzalan and accordingly, smaller size fraction fly ash was considered inappropriately reactive to act as a water reducer.
  • [0026]
    In addition, due to the high specific surface area of the smaller size fraction fly ash, it was expected that this material would in fact increase water demand. The applicants have surprisingly found that the opposite is in fact the case. The smaller size fraction fly ash boosts the water reducing properties of conventional water reduction agents by a substantial extent.
  • [0027]
    The aluminous material in the mineral additive preferably has a predominant particle size less than about 150 microns. The reference to “aluminous material” should not be taken literally but refers to alumina type materials including hydrated, partially hydrated and unhydrated alumina. Preferably, the alumina content of aluminous material based on the weight of cement is between about 5 and 30%, preferably about 10 to 25% and most preferably about 15 to 20%.
  • [0028]
    If a blend of hydrated alumina and fly ash is used in the mineral additive, the ratio of hydrated alumina:fly ash is preferably between about 1:1 to 1:10.
  • [0029]
    The term “hydraulic or cementitious binder” as used herein, means all inorganic materials which comprise compounds of calcium, aluminum, silicon, oxygen, and/or sulfur which exhibit “hydraulic activity” that is, which set solid and harden in the presence of water. Cements of this type include common Portland cements, fast setting or extra fast setting, sulphate resisting cements, modified cements, alumina cements, high alumina cements, calcium aluminate cements and cements which contain secondary components such as fly ash, slag and the like. The amount of cement present in the composition of the preferred embodiments of the present invention has a lower limit of about 10 weight percent based on the total dry ingredients, preferably about 15 weight percent, more preferably about 20 weight percent, the upper limit of the amount of the cement is about 50 weight percent, preferably about 40 weight percent, more preferably about 30 weight percent.
  • [0030]
    The cementitious composition may optionally but preferably include at least one filler material, e.g. graded and ungraded aggregate such as washed river gravel, crushed igneous rock or limestone, lightweight aggregate, crushed hard-burnt clay bricks or air-cooled blast furnace slag, sand, calcium carbonate, silica flour, vermiculite, perlite, gypsum, etc.
  • [0031]
    The amount of filler present in the cementitious composition preferably has a lower limit of about 5 weight percent based on the total dry ingredients, preferably about 10 weight percent, more preferably about 15 weight percent; the upper limit being about 30 weight percent, preferably about 25 weight percent, more preferably about 20 weight percent.
  • [0032]
    The cementitious composition may optionally contain other additives including: cement plasticising agents such as melamine sulphonate-formaldehyde condensates, naphthalene sulphonate-formaldehyde condensates, naphthalene sulphonates, calcium lignosulphonates, sodium lignosulphonates, saccharose, sodium gluconate, sulphonic acids, carbohydrates, amino carboxylic acids, polyhydroxy carboxylic acids, sulphonated melamine, and the like.
  • [0033]
    The amount of conventional plasticiser used in the dry cement composition will vary, depending on the fluidising ability of the particular cement plasticiser selected. Generally, the amount of cement plasticiser is preferably in the range of about 0.3 to about 3 wt %, and more preferably about 0.5 to about 2 wt %, based on the weight of the dry cement composition.
  • [0034]
    Preferred plasticisers include Melment. F-10, a melamine-formaldehyde-sodium bisulphite polymer dispersant, marketed by SKW-Trostberg in the form of a fine white powder. Another suitable plasticiser is Neosyn, a condensed sodium salt of sulphonated naphthalene formaldehyde, available from Hodgson Chemicals.
  • [0035]
    Thickener may also be used in the cementitious composition including one or more of the polysaccharide rheology modifiers which can be further subdivided into cellulose based materials and derivatives thereof, starch based materials and derivatives thereof, and other polysaccharides.
  • [0036]
    Suitable cellulose based rheology-modifying agents include, for example, methylhydroxyethylcellulose, hydroxymethylethylcellulose, carboxymethylcellulose, methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxyethylpropylcellulose, etc. The entire range of suitable rheology modifiers will not be listed here, nevertheless, many other cellulose materials have the same or similar properties as these and are equivalent.
  • [0037]
    Suitable starch based materials include, for example, amylopectin, amylose, sea-gel, starch acetates, starch hydroxyethyl ethers, ionic starches, long-chain alkylstarches, dextrins, amine starches, phosphate starches, and dialdehyde starches.
  • [0038]
    Other natural polysaccharide based rheology-modifying agents include, for example, alginic acid, phycocolloids, agar, gum arabic, guar gum, welan gum, locust bean gum, gum karaya, and gum tragacanth.
  • [0039]
    The thickener addition rate in the cementitious composition may range between 0.0001 and 0.5% based on the weight of the dry cement composition.
  • [0040]
    Latex addition of at least one latex selected from the group consisting of: an acrylic latex, a styrene latex , and a butadiene latex is also preferred. This component improves adherence, elasticity, stability and impermeability of the cementitious compositions containing it, and also favours formation of flexible films.
  • [0041]
    The latex may be used in solid amounts of about 0.5 to about 20 wt %, based on the weight of the dry cement composition. Preferably, it is present in an amount of about 1 to about 15 wt %, and more preferably about 10 wt %, based on the weight of the dry cement composition.
  • [0042]
    The cementitious composition may optionally incorporate as a substitute to the latex emulsion a proportion of a powdered vinyl polymer or other equivalent polymeric material, to enhance the adhesion; resilience and flexural strength; and abrasion resistance of the composition.
  • [0043]
    The powdered vinyl polymer is preferably polyvinyl acetate or a copolymer of vinyl acetate with another monomer, such as ethylene. A preferred vinyl acetate resin is VINNAPAS LL5044 thermoplastic resin powder, containing a vinyl acetate-ethylene copolymer, available from WACKER.
  • [0044]
    The powdered vinyl polymer may be used in amounts of about 0.5 to about 20 wt %, based on the weight of the dry cement composition. Preferably, it is present in an amount of about 1 to about 15 wt %, and more preferably about 10 wt %, based on the weight of the dry cement composition.
  • [0045]
    The cementitious composition may optionally contain about 0-40 wt % of other fillers/additives such as mineral oxides, hydroxides and clays, metal oxides and hydroxides, fire retardants such as magnesite, thickeners, silica fume or amorphous silica, colorants, pigments, water sealing agents, water reducing agents, setting rate modifiers, hardeners, filtering aids, plasticisers, dispersants, foaming agents or flocculating agents, water-proofing agents, density modifiers or other processing aids
  • EXAMPLES
  • [0046]
    So that the present invention may be more clearly understood it will now be described by way of example only with reference to the following embodiments.
  • Example 1 Effect of Water Reducer and Small Size Fraction Fly Ash Addition on % Water Reduction in a Cement: Fly Ash Mixture
  • [0047]
    Three mixes (total weight of solids=1000 gm each) were mixed with water to achieve a mix viscosity of 4-3 seconds cup drainage time. The details of the mixes are shown in Table 1 below.
    TABLE 1
    Mix 1 Mix 2 Mix 3
    Mix ingredients weight, gm weight, gm weight, gm
    Cement 300 gm 300 gm 300 gm
    Fly ash (large size 700 gm 700 gm 500 gm
    fraction)
    Fly ash (small size 200 gm
    fraction)
    Water reducer 3 gm 3 gm
    (sulphonated
    naphthalene
    formaldehyde)
    Styrene Acrylic 60 ml 60 ml 60 ml
    Latex Emulsion
    (56% solids)
    Welan Gum
    (Kelcocrete) 0.1 gm 0.1 gm 0.1 gm
    Water 550 ml 350 ml 325 ml
    Water reduction 36% 41%
    in mix, %
    Viscosity (drainage 3 seconds 3 seconds 4 seconds
    time in 50 ml cup)
  • [0048]
    It can be seen that the addition of 1% water reducer by weight in cement resulted in 36% reduction in mix water. This level of water reduction is, according to literature, about the limit of what can be achieved at such high water reducer dose. Using higher doses would result in excessively delayed setting time and reduction in the compressive strength in cementitious mixes. When part of the large size fraction fly ash was substituted with smaller size fraction (predominant particle size less that 10 microns) in mix 3, further water reduction was achieved, bringing total water reduction to 41%. This result is quite surprising, as the finer fly ash was expected to in fact increase the water demand in the mix due to its high surface area.
  • [0049]
    Although the water reducing effect of fly ash in cementitious mixes is well documented in literature, the plasticity enhancing effect of the smaller size fraction in an already plasticised cement:fly ash mixture is considered surprising given the universal rule that finer material exhibit larger surface area, leading to an increase in the water demand, needed as mechanical water coating the finer particles.
  • [0050]
    Example 1 demonstrates a means of enhancing the water reduction effect in plasticised mixes using a mineral additive with a specified size range, namely the small size fraction fly ash, without resorting to overdosing with water reducer. The result is a more durable mix with higher strength and reduced shrinkage.
  • Example 2 Water Reduction in Plasticised Mixes Substituting Large Size Fraction Fly Ash for Smaller Size Fraction Fly Ash
  • [0051]
    Two mixes (total weight of solids=1000 gm each) were mixed with water to achieve a mix viscosity in the range of 6-10 Poise. The details of the two mixes are shown in Table 2 below.
    TABLE 2
    Mix 1 Mix 2
    Mix ingredients weight, gm weight, gm
    Cement 300 gm 300 gm
    Fly ash (large size fraction) 400 gm 250 gm
    Fly ash (small size fraction) 150 gm
    Cenospheres 300 gm 300 gm
    Melment 15 (SKW Chemicals) 3 gm 3 gm
    (sulphonated melamine formaldehyde)
    MC 1834 Acrylic Resin (Rohm & 10 ml 10 ml
    Haas)
    Water 400 ml 325 ml
    Water reduction 19%
    Viscosity (Rotothinner) 6.5 Poise 8.8 Poise
  • [0052]
    It can be seen that Mix 1 which was comprised of cement, fly ash and cenospheres (ceramic hollow spheres) required 400 ml of water to achieve the required viscosity (in the presence of 1% addition of Melment F15 water reducer). The % solids in this case is 71.4%.
  • [0053]
    Mix 2, however, required only 325 ml of water to achieve a similar flowability. Such water reduction (around 20%) was enabled by substituting part of the larger fly ash particles with a smaller size fraction (minus 10 microns in size, average size=4 microns).The % solids in this case was increased to 75.5%.
  • Example 3 Water Reduction in Plasticised Mixes—Comparison of Silica to Fly Ash.
  • [0054]
    Two mixes (total weight of solids=1000 gm) were mixed with water to achieve a mix viscosity of 4-3 seconds cup drainage time. The details of the two mixes are shown in Table 3 below.
    TABLE 3
    Mix 1 Mix 2
    Mix ingredients weight, gm weight, gm
    Cement 300 gm 300 gm
    Fly ash (large size fraction) 500 gm 500 gm
    Fly ash (small size fraction) 200 gm
    Silica 200 gm
    Water reducer 3 gm 3 gm
    (sulphonated naphthalene
    formaldehyde)
    Styrene Acrylic Latex Emulsion 60 ml 60 ml
    (56% solids)
    Welan Gum (Kelcocrete) 0.1 gm 0.1 gm
    Water 400 ml 325 ml
    Water reduction in plasticised mix 19%
    Viscosity (drainage time 4 seconds 4 seconds
    in 50 ml cup)
  • [0055]
    It can be seen that Mix 1 which was comprised of cement, fly ash and silica required 400 ml of water to achieve the required viscosity (in the presence of 1% water reducer addition). The % solids in this case is 71.4%.
  • [0056]
    Mix 2, however, required only 325 ml of water to achieve a similar flowability. Such water reduction (around 20%) was enabled by substituting the silica with ultra fine fraction (minus 10 microns in size, average size=4 microns).The % solids in this case was increased to 75.5%.
  • Example 4 Water Reduction in Plasticised Mixes Incorporating Combination of Hydrated Alumina and Fly Ash
  • [0057]
    In Table 4, the water requirements for two mixes containing 1.0% addition (by weight of cement) of a water reducer, ie sulphonated naphthalene formaldehyde, are compared.
    TABLE 4
    Weight (Mix 1) Weight (Mix 2)
    without hydrated With hydrated
    Mix ingredients alumina alumina
    Cement 10000 gm 10000 gm
    Fly ash (large size fraction) 16000 gm 16000 gm
    Fly ash (small size fraction) 8000 gm 8000 gm
    Calcium Carbonate 6000 gm 4000 gm
    (Omyacarb Grade
    40)
    Hydrated Alumina 2000 gm
    Water reducer 100 gm 100 gm
    (naphthalene formaldehyde
    sulphonate)
    Welan Gum (Kelcocrete) 3 gm 3 gm
    Styrene Acrylic Latex 2000 ml 2000 ml
    Emulsion (56% solids)
    Water 16500 ml 12500
    Water reduction in 25%
    plasticised mix, %
    Viscosity (drainage time 3.5 seconds 3 seconds
    in 50 ml cup)
  • [0058]
    It can be seen that the addition of 2000 gm of hydrated alumina in mix 2 (in substitution of calcium carbonate), resulted in a significant reduction in the water demand, ie from 16500 to 12500 ml, for the same viscosity level.
  • [0059]
    This level of water reduction (around 25% in an already heavily plasticised mix) is quite unexpected. It is also contrary to conventional water reduction trends presented in cement chemistry literature which suggest that the amount of water reduction ranges generally between 15% to 35%, and that (beyond a particular dosage) further water reduction is not possible (Concrete Admixtures Handbook by, Ramachandran, 2nd edition, page 447).
  • [0060]
    From the examples outlined above it can be seen that using a mineral additive comprising small size fraction fly ash and/or aluminous materials provide water reduction in non-plasticised cementitious mixes or additional/enhanced water reduction in plasticised cementitious mixes containing a conventional water reducing agent. Such significant increase in water reduction between 20% and 40% will enable production of high performance cementitious mixes (lower shrinkage, higher strength, more durable), without the disadvantages of overdosing with conventional organic water reducers, ie delayed setting time, strength reduction, excessive aeration . etc.
  • [0061]
    It will be understood that the modifications or variations can be made to the aforementioned embodiments without departing from the spirit or scope of the present invention. In particular, it will be appreciated that the formulations, coatings, additives, methods and composite products of the present invention are suitable or may be adapted for use in conjunction with the methods and apparatus as described in the various priority documents.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2987408 *Mar 27, 1958Jun 6, 1961Corson G & W HPozzolanic material
US3360392 *Jul 9, 1964Dec 26, 1967Celotex CorpApparatus and method for applying spatter finish
US3873025 *May 6, 1974Mar 25, 1975Stora Kopparbergs Bergslags AbMethod and apparatus for atomizing a liquid medium and for spraying the atomized liquid medium in a predetermined direction
US4204644 *Oct 25, 1977May 27, 1980Asahi Glass Company, LimitedSpraying apparatus for preparing glass fiber reinforced cementitious product
US4250134 *Jun 20, 1979Feb 10, 1981L. John MinnickMethod for the production of cementitious compositions and aggregate derivatives from said compositions
US4256584 *Jul 25, 1979Mar 17, 1981Mold-Masters LimitedInjection molding filter assembly
US4261286 *Jul 9, 1979Apr 14, 1981Maschinenfabrik Max KroenertApparatus for coating of moving sheets with a contact adhesive
US4268316 *Jul 27, 1979May 19, 1981Martin Marietta CorporationMasonry cement composition
US4403006 *Mar 13, 1980Sep 6, 1983United States Gypsum CompanySag-resistant gypsum board containing coal fly ash and method for making same
US4411723 *Dec 10, 1981Oct 25, 1983Kurimoto Iron Works, Ltd.Glass fiber-reinforced cement plates
US4818595 *Apr 24, 1987Apr 4, 1989Delphic Research Laboratories, Inc.Fire barrier coating and fire barrier plywood
US4915740 *Sep 24, 1987Apr 10, 1990Denki Kagaku Kogyo Kabushiki KaishaHydraulic material composition having high strength
US4981740 *Mar 21, 1989Jan 1, 1991Kkkk A/SAcid resistant concrete articles, especially sulfur concrete pipes, and a method of manufacturing said articles
US5032548 *Feb 27, 1990Jul 16, 1991Marathon Oil CompanyConstruction material containing catalytic cracking catalyst particles
US5073197 *Aug 3, 1989Dec 17, 1991National Research Development CorporationCement compositions
US5236773 *Oct 25, 1991Aug 17, 1993The United States Of America As Represented By The Secretary Of The NavyFire-resistant barriers for composite materials
US5294255 *Sep 23, 1992Mar 15, 1994Specrete-Ip IncorporatedPumpable backfill grout
US5314119 *Oct 4, 1993May 24, 1994Latanick Equipment, Inc.Method and apparatus for applying thin coatings of fluid droplets
US5383521 *Apr 1, 1993Jan 24, 1995Halliburton CompanyFly ash cementing compositions and methods
US5387283 *Jun 29, 1994Feb 7, 1995Kirkpatrick; William D.Process for producing a hydraulic cement binder for both general and special applications
US5439518 *Jan 6, 1993Aug 8, 1995Georgia-Pacific CorporationFlyash-based compositions
US5484480 *Oct 19, 1993Jan 16, 1996Jtm Industries, Inc.Use of alumina clay with cement fly ash mixtures
US5490889 *Jan 20, 1995Feb 13, 1996Kirkpatrick; William D.Blended hydraulic cement for both general and special applications
US5536310 *Oct 6, 1994Jul 16, 1996Sandoz Ltd.Cementitious compositions containing fly ash
US5556458 *Oct 6, 1994Sep 17, 1996Sandoz Ltd.Cementitious compositions
US5693137 *Nov 29, 1995Dec 2, 1997Jtm Industries, Inc.Use of alumina clay with cement fly ash mixtures
US5820668 *Dec 22, 1995Oct 13, 1998Ib Technologies LlcInorganic binder composition, production and uses thereof
US5853475 *May 19, 1995Dec 29, 1998New Jersey Institute Of TechnologyCompressive strength of concrete and mortar containing fly ash
US5997632 *Jan 30, 1998Dec 7, 1999Mineral Resources Technologies, LlcBlended hydraulic cement
US6008275 *May 14, 1998Dec 28, 1999Mbt Holding AgCementitious mixture containing high pozzolan cement replacement and compatabilizing admixtures therefor
US6332921 *Aug 9, 2000Dec 25, 2001Halliburton Energy Services, Inc.Cement compositions and methods for high temperature wells containing carbon dioxide
US6346146 *Apr 9, 1998Feb 12, 2002James Hardie Research Pty LimitedBuilding products
US6482258 *Jun 25, 2001Nov 19, 2002Mineral Resource Technologies, LlcFly ash composition for use in concrete mix
US6682595 *Sep 12, 2002Jan 27, 2004Ronald Lee BarbourSettable composition containing potassium sulfate
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7344593Mar 1, 2002Mar 18, 2008James Hardie International Finance B.V.Fiber reinforced cement composite materials using chemically treated fibers with improved dispersibility
US7658794Apr 15, 2003Feb 9, 2010James Hardie Technology LimitedFiber cement building materials with low density additives
US7704316Mar 4, 2002Apr 27, 2010James Hardie Technology LimitedCoatings for building products and methods of making same
US7727329Feb 28, 2008Jun 1, 2010James Hardie Technology LimitedFiber cement building materials with low density additives
US7815841Jan 13, 2004Oct 19, 2010James Hardie Technology LimitedFiber cement composite materials using sized cellulose fibers
US7857906Feb 21, 2008Dec 28, 2010James Hardie Technology LimitedFiber reinforced cement composite materials using chemically treated fibers with improved dispersibility
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