CN101575195A - Fiber cement building materials with low density additives - Google Patents
Fiber cement building materials with low density additives Download PDFInfo
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- CN101575195A CN101575195A CNA2008101871095A CN200810187109A CN101575195A CN 101575195 A CN101575195 A CN 101575195A CN A2008101871095 A CNA2008101871095 A CN A2008101871095A CN 200810187109 A CN200810187109 A CN 200810187109A CN 101575195 A CN101575195 A CN 101575195A
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- 239000000835 fiber Substances 0.000 title claims abstract description 53
- 239000004568 cement Substances 0.000 title claims abstract description 43
- 239000000654 additive Substances 0.000 title abstract description 71
- 239000004566 building material Substances 0.000 title abstract description 5
- 239000004005 microsphere Substances 0.000 claims abstract description 152
- 239000000463 material Substances 0.000 claims abstract description 150
- 239000000203 mixture Substances 0.000 claims abstract description 32
- 239000000919 ceramic Substances 0.000 claims abstract description 27
- 238000009472 formulation Methods 0.000 claims abstract description 8
- 238000010276 construction Methods 0.000 claims description 71
- 239000003795 chemical substances by application Substances 0.000 claims description 40
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 35
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000009782 nail-penetration test Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
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- 238000003672 processing method Methods 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 239000011049 pearl Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- MKTRXTLKNXLULX-UHFFFAOYSA-P pentacalcium;dioxido(oxo)silane;hydron;tetrahydrate Chemical group [H+].[H+].O.O.O.O.[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O MKTRXTLKNXLULX-UHFFFAOYSA-P 0.000 description 1
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- CCEKAJIANROZEO-UHFFFAOYSA-N sulfluramid Chemical group CCNS(=O)(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F CCEKAJIANROZEO-UHFFFAOYSA-N 0.000 description 1
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Images
Abstract
This invention relates to a formulation with the addition of low density additives of volcanic ash, hollow ceramic microspheres or a combination of microspheres and volcanic ash or other low density additives into cementitious cellulose fiber reinforced building materials. This formulation is advantageously lightweight or low density compared as compared to current fiber cement products without the increased moisture expansion and freeze-thaw degradation usually associated with the addition of lightweight inorganic materials to fiber cement mixes. The low density additives also give the material improved thermal dimensional stability.
Description
The application divides an application, and the applying date of original application is that March 9 calendar year 2001, application number are that 01808151.7 (PCT/US01/07948), denomination of invention are " fiber cement building materials that contains low density additives ".
Technical field
The present invention relates to material of construction and manufacture method thereof, relate more specifically to low density additives (LDA) is added in Cement fibre cellulose fiber-enhancing material of construction.
Background technology
Fiber-refinforced cement (FRC) product such as water-fast building sheet have been used for building since 1895.In nearest history, the fortifying fibre that is used for this product not only comprises fibrous magnesium silicate, also comprises cellulosic fibre (referring to Australian Patent 515151), steel fiber, glass fibre and other neutrality and synthon.In general, the density of this building sheet is for being approximately 1.2-1.7g/cm
3, the variable density generally change of the mud jacking by fibrous cement paste used in making and dehydration and fiber consumption realizes.In these density, have seldom space based on the matrix of cement, cause water-absorbent to reduce, and that water-absorbent is considered to cement matrix excellent durability the subject of knowledge and the object of knowledge usually is essential.
The density of above-mentioned fibrocement means that described product is heavier and processing characteristics is reduced than the product based on timber of same size.Processing characteristics comprises the processing of plate and the easiness of finishing.Therefore, the fibrocement building products is difficult to cutting more, carries out mechanical workout and followed closely than timber with based on the product of timber.In this respect, the density range of natural wood generally is: for stiff wood is about 0.7-0.9g/cm
3, be about 0.38-0.6g/cm for dried cork
3Therefore, expectation have the density that is similar to timber the density modification the fibrocement material with improve processing characteristics and make its can be lighter, more followed closely, be easier to cutting and be easier to become desire the manufacturing machine converted products.But if the fibrocement of density modification is done the application of same range as, these performances must obtain in the wearing quality, resistivity against fire, preservative property and the water-repellancy that keep fibrocement.
Description of the Prior Art how the light-weight inorganic powder can be added in cement or the fiber-refinforced cement material as density properties-correcting agent.The low density additives of FRC product is defined as has about 0.8g/cm
3(approximately 50lbs./cu.ft.) or littler bulk density.Used typical low density additives (LDA) comprises low bulk density calcium silicate hydrate (CSH), expanded polystyrene pearl (EPS), expanded vermiculite, pearlstone, heaving shales and swelling clay.Contain these inorganic particles mainly the space realizes by introducing in material based on the density modification of the material of cement.In general, material is immersed in the water or during with the rainwater Long contact time these holes filled by water.This causes these materials to have more weak wet dimensional stability (wet fastness), higher saturated quality and the weak anti-freeze-thaw property extremely done.
Therefore, need a kind of improvement with the product that is better than the typical density modification wet or dried dimensional stability lightweight FRC material of construction and be used to make its method.Secondly, if the material of described density modification is used for identical range of application, it is similarly wet to doing dimensional stability with the FRC product that does not contain density properties-correcting agent that light building material should keep.In addition, very preferably described in some applications material also has low saturated quality, good anti-freeze-thaw property and high temperature dimensional stability.At last, also expectation has so a kind of FRC building products: wherein, can acquisition with timber and based on the product of timber more approaching hang down the density of scope and the wearing quality of improvement.
Summary of the invention
The present invention has estimated has the low density additives more better than typical low density additives concerning two kinds of FRC material of construction.These two kinds of low density additives are volcanic ash and ceramic microspheres body.One embodiment of the invention comprise volcanic ash (VA) are added in the FRC material of construction.Second embodiment comprises ceramic microspheres body (microsphere) added in the FRC material of construction.The 3rd embodiment comprises that the blend with microsphere and volcanic ash and/or other typical low density additives is added to the FRC material of construction.May be more more preferred with microsphere and the 3rd embodiment of VA and/or other low density additives blending than only adding pozzuolanic first embodiment.Depend on and consider to be used for the concrete performance of using, second embodiment that only adds microsphere is more more preferred than the first or the 3rd above-mentioned embodiment.
Compare with present FRC product, an advantage that contains pozzuolanic first embodiment is it provides the product of the dimensional stability of the processing characteristics with low density and improvement that is better than typical low density additives and improvement with economic price.
Second embodiment is included in and adds microsphere in fiber-cement products.Compare with present FRC product, the advantage that adds microsphere comprises the low density of product and the processing characteristics of improvement, and does not have the hygral expansion or the freeze-thaw degraded of the increase relevant with adding light inorganic material in the FRC mixture.And the adding of microsphere provides the thermal shape stablity of the FRC material of improvement.
The 3rd embodiment relates to adding and VA and/or other typical low density additives bonded microsphere additive in the FRC material.With microsphere and other low density additives blending is favourable, and this is because can obtain more low-density FRC product, and owing to VA and other typical LDA than the low weight percent add-on less (with only adding microsphere and comparing) that causes of microsphere density.This also makes fibrocement obtain lower density range with the further processing characteristics of improving, simultaneously microsphere make low density additives to wet-minimize to-the detrimental action of doing dimensional stability and total wearing quality.
Therefore, in one aspect of the invention, provide a kind of material of construction, described material of construction comprise fiber-refinforced cement prescription and be added to this prescription in low density additives.Compare with the material of construction of the fiber that does not the contain low density additives-refinforced cement prescription that contains equivalent, the adding of low density additives reduces the density of described material of construction in the prescription, compare simultaneously, contain hygral expansion that the material of construction of low density additives increases less than about 20% with the material of construction of the fiber that does not the contain low density additives-refinforced cement prescription that contains equivalent.More preferably, compare with the material of construction of the fiber that does not the contain low density additives-refinforced cement prescription that contains equivalent, low density additives is added to the density that described prescription reduces described material of construction, compare with the material of construction of the fiber that does not the contain low density additives-refinforced cement prescription that contains equivalent simultaneously, described low density additives keeps or reduces the hygral expansion of material of construction.The density of described material of construction is preferably about 1.2g/cm
3Or it is littler.
In another aspect of this invention, provide a kind of material of construction prescription to form a kind of building products.Described prescription comprises the water-setting tackiness agent, gathers materials, fiber and volcanic ash.In one embodiment, compare with the building products that is not contained pozzuolanic prescription manufacturing by equivalent, described volcanic ash improves processing characteristics and the density of final building products is reduced and surpasses about 10%.In another embodiment, contain pozzuolanic prescription in that have aspect the hygral expansion of the finished product can uncared-for difference, thereby compare with the building products that is not contained pozzuolanic formulation by equivalent, described product keeps or increases hygral expansion less than about 20% ground.About the realization degree of density modification, this wet change increase is low astoundingly.The hygral expansion difference of finding the volcanic ash prescription when normally using the same recipe composition exists.This difference mainly is because due to the fluctuation on the stock chart area.
In another aspect of this invention, provide a kind of method that is used to form the low density material of construction.With the water-setting tackiness agent, gather materials, volcanic ash and water mixes pulping.This slurry is processed into green formed article.This green formed article is solidify to form the low density material of construction.In one embodiment, by the hot-pressing processing method article are solidified.In another embodiment, the density of the low density material of construction of formation is about 1.2g/cm
3Or lower, and hygral expansion is about 0.17% or lower.
In another aspect of this invention, a kind of material of construction prescription comprise the water-setting tackiness agent, gather materials, fiber and ceramic microspheres body.The density of final material of construction is about 1.2g/cm
3Or it is lower.In one embodiment, in prescription, provide about 4.1%-15% cellulosic fibre.In another embodiment, compare with the material of construction that is not contained the prescription manufacturing of microsphere by equivalent, described microsphere reduces the density of final building products and surpasses approximately 15%, even more preferably surpasses about 30%.In another embodiment, compare with the material of construction that is not contained the prescription manufacturing of microsphere by equivalent, described microsphere reduces the hygral expansion of the finished product, and preferred the reduction surpasses approximately 5%, more preferably surpasses about 10%.The combination of microsphere and other additional low density additives such as volcanic ash and/or low bulk density CSH is provided in prescription in a preferred embodiment.
In another aspect of this invention, provide a kind of method that forms the low density material of construction, comprised the water-setting tackiness agent, gather materials, fiber, ceramic microspheres body and water mixes pulping.This slurry is processed into green formed article.This green formed article is solidify to form the low density material of construction.The density of the material of construction of gained is about 1.2g/cm
3Or it is lower.In one embodiment, will be greater than about 4% blending in of fibers pulping.In another embodiment, by the hot-pressing processing method article are solidified.
Description of drawings
Fig. 1 makes the MIP graph of pore diameter distribution of plate for the Hatschek that contains and do not contain the ceramic microspheres body in freeze-thaw test later on.
Fig. 2 makes the BET graph of pore diameter distribution of plate for the Hatschek that contains and do not contain the ceramic microspheres body in freeze-thaw test later on.
Fig. 3 makes the SEM photo figure of plate for the Hatschek that contains 10wt.% ceramic microspheres body that does not show degraded after 147 freeze-thaw circulations.
Fig. 4 is the graph of a relation between low density additives adding, density and the intensity.
Embodiment
Embodiment preferred of the present invention is described a kind of with at least a blended fiber-refinforced cement material of construction in ceramic microspheres body and/or two kinds of low density additives of volcanic ash.Can recognize that these additives not only can be used for material of construction type as herein described (being fiber reinforced material), also can be used for other material of construction.In addition, consider that also multiple composite sphere body and/or volcanic ash combine with other density properties-correcting agent to reduce density and the overall performance of improving material of construction.And; consider that also other keeps or reduce the hygral expansion of the finished product when obtaining properties of low density, and improve processing characteristics, wearing quality and other performance (as following) be similar to ceramic microspheres body and pozzuolanic low density additives within protection scope of the present invention.
1. first embodiment-volcanic ash
In the first embodiment, the present invention relates to that volcanic ash is added to the Cement fibre cellulose fiber strengthens in the material of construction.Volcanic ash is for being commonly referred to as " air perlite ", " float stone " or " pumicsite ".Usually volcanic ash is a kind of natural glass from the volcano magma during the volcanic explosion.Volcanic ash is a kind of lighter sand settling that is formed by the pyromagma cooling, produces the material that comprises about 30wt.% crystalline mineral and the amorphous volcanic ash glass of 70wt.%.Its typical bulk density is about 25-75lbs./cu.ft.Common this volcanic ash along with the importing of heat and the change form that expands, and obtain the typical volumes density range be about 2-25lbs./cu.ft than light material.The expansion volcanic ash can have from the particle diameters less than about 10 microns extremely about 425 microns wide regions, and the scope of median particle diameter is about 20-100 micron.Described chemical composition is mainly by silica (SiO
2), aluminum oxide (Al
2O
3) and potassium oxide (K
2O) form.
Volcanic ash or expansion volcanic ash can be from obtaining such as following supplier: TuffliteInc.of Phoenix, Ariz.; California Industrial Minerals ofFriant, Calif.; US Pumice of Chatsworth, Calif.; Amcor Precastof Idaho Falls, Id.; Hess Pumice Products of Malad City, Id.; Kansas Minerals Inc.of Mankato, Kans.; Calvert Corporationof Norton, Kans.; Copar Pumice Company of Espanola, N.M.; C.R.Minerals of Santa Fe, N.M.; Utility Block of Alburquerque N.M.; With Cascade Pumice of Bend, Oreg.
One of first embodiment of the invention preferred prescription comprises the water-setting tackiness agent, gathers materials, fiber, volcanic ash and additive.Described water-setting tackiness agent is preferably portland cement, but can also be but be not limited to the particulate state portland blast-furnace slag cement of high alumina cement, stone sand, grinding and gypsum and plaster and whitewash or their mixture.The described preferred ganister sand that grinds that gathers materials, and can be but be not limited to amorphous silica, diatomite, rice hull ash, blast-furnace slag, grinding slag, iron and steel slag, mineral oxide compound, mineral oxyhydroxide, clay, wagnerite or rhombspar, polymeric beads, metal oxide and oxyhydroxide, or their mixture.Described fiber preferred cellulose wood oar, but can also be but be not limited to ceramic fiber, glass fibre, ore deposit silk floss, steel fiber and synthetic polymer fiber such as polymeric amide, polyester, polypropylene, polymethylpentene, polyacrylonitrile, polyacrylamide, viscose glue, nylon, PVC, PVA, artificial silk, glass-ceramic, carbon or their mixture.Described additive can include but not limited to siliceous smog, underground heat silica, fire retardant, thickening material, pigment, tinting material, softening agent, dispersion agent, whipping agent, flocculation agent, water-resisting agent, organic density properties-correcting agent, aluminium powder, kaolin, alumina trihydrate, mica, metakaolin, lime carbonate, wollastonite, polymer resin emulsion or their mixture.
Volcanic ash can be used for the multiple water-setting tackiness agent that contains different ratios, gathers materials, the building products of volcanic ash and additive to be to obtain best concrete application performance (as wallboard, cover tile, fringing, soffit, tile lower floor backing plate etc.).Be appreciated that pozzuolanic percentage composition to depend on intended application and change.A kind of preferred compositions can comprise about 5%-80% portland cement, about 0%-80% silica, about 4.1%-15% Mierocrystalline cellulose, about 0%-10% additive and about 2%-50% volcanic ash.A specific examples that typically contains pozzuolanic prescription is as follows:
Portland cement (tackiness agent) 28%
Silica (gathering materials) 54%
Mierocrystalline cellulose (fiber) 7%
Metal hydroxides (additive) 4%
Volcanic ash (LDA) 7%
The fineness number of preferred cement and silica is about 200 to 450m
2/ kg.Fineness number according to ASTMC204-96a test cement and silica.
Can carry out or not carry out under the situation of post-treatment, by described material being processed to form green formed article from hydrosol mixture or slurry such as following ordinary method well known by persons skilled in the art:
● Hatschek plate method;
● Mazza manages method;
● the Magnani method;
● injection molding;
● extrusion molding;
● the hand lay-up method;
● moulding method;
● casting;
● filter press technique;
● flow in the machine, roll forming or the like.
The procedure of processing and the parameter that are used to obtain the finished product have been described in Australian Patent 515151.
The preferred Procuring of described material 80 hours at the most, most preferably 24 hours or littler, with the prescription that obtains setting.Then with described material in air set (about 28 days), perhaps more preferably at high temperature carry out hot-pressing processing, and under 120-180 ℃ under vapour-saturated environment the compacting 3-30 hour, most preferably 24 hours or littler.Solidified length and time are depended on the form of prescription, manufacturing process and article.
Test-results
Density and processing characteristics
Pozzuolanic adding has reduced density and has improved overall processability with economic price in the fibrocement material, has reduced the viewed hygral expansion of hygral expansion of typical low density additives simultaneously.It is lighter to contain pozzuolanic product, so easy handling, nail and quarter and press to target shape.Containing pozzuolanic prescription also reduces when plate (as 3/8-3/4) edge breaks or broken loose (if any) when being followed closely that keep to the side.Following table 1 and 2 illustrations the test-results of FRC prescription and these prescriptions, more specifically proof adds volcanic ash to reduce density and to improve the advantage of processing characteristics.
Table 1 is used for the prescription of table 2 test-results
The discord that contains table 2 does not contain pozzuolanic performance relatively
| Test method | Prescription K 17.5% volcanic ash | Prescription B contrast LDA |
| (O.D.) density (g/cm 3) | 1.11 | 1.34 |
| Nail penetrates 3(equilibrium conditions) 2The length standard deviation of the mm 50mm of nail (2 inches)=nail in the material | 45.4 1.1 | 33.0 1.0 |
1For prescription K, replace contrast with 7.5% volcanic ash, the 7.5wt.% among the prescription B gathers materials.
2Equilibrium conditions-sample is regulated 73 ± 4 the controlled normal atmosphere and the condition of 50 ± 5% humidity of being in.Definition and description that finger hereinafter is used to follow closely penetration test.
3Finger is about the definition and the following description of nail penetration test.
Above table 2 relatively contains or does not contain pozzuolanic 10 " * 10 " test-results of strainer weight prototype board.Prototype board is made by the following method: with Hobart mixing tank compound target prescription to form homogenate, then between two-layer steel dewatering plate under 3500psi with Wabash pressing machine (model #PC-75-4TM) mud jacking 1 minute to form a kind of single piece plate.In the steel frame casting die with place below the pulp mixture and above steel wire mesh screen (30-40US order) chengjiang.Then with minimum about 12 hours of single piece plate Procuring, and about 12 hours of hot-pressing processing under the pressure in high temperature and 150 ℃ of vapo(u)rous environment.
In table 2, with equivalent do not contain pozzuolanic prescription, prescription B, control formula is compared, approximately reduction is about 17% with density to contain the pozzuolanic prescription of 7.5wt.% K, from 1.34g/cm
3Reduce to 1.11g/cm
3The equivalent prescription is defined as a kind of like this prescription in this article: wherein, preferred LDA (as volcanic ash) by identical percentile tackiness agent, gather materials and/or additive replaces, more preferably by the identical percentile replacement of gathering materials.The density of this reduction is also improved nailability, perhaps is easy to push in the plate hammering into.Test shows that nail penetrates from 33.0mm and increases to 45.4mm, and wherein, 50mm representative nail is long, thereby is that the spike that can realize penetrates.The nail penetration test is made up of following steps: use Paslode
Wireless framework hardware rifle (the positive replacement) hammers into the plate of layer to guarantee the consistent pressure that hammers into.The plate of described layer generally comprises the 1/4-1/2 that is accumulated to greater than the height of nail length (20 inches or 50mm) " slab.Use Senco 6d to electroplate the head nail (part #GC21AABN) of clamping.
Therefore in one embodiment, be about 1.3g/cm with density
3The typical building steel plate compare, above-mentioned material of construction prescription causes the density of the finished product less than about 1.2g/cm
3More preferably, can regulate preferably that pozzuolanic add-on is about 1.2g/cm to obtain density in the material of construction prescription
3Or littler, perhaps with equivalent do not contain pozzuolanic prescription mutually specific density reduce about 10% or bigger the finished product.Also consider to add the density that more substantial volcanic ash further reduces building products.
Wet-dried dimensional stability
Compare with the FRC prescription that does not contain LDA, on the basis that weight percent increases, the cured fiber cement formula that contains conventional density properties-correcting agent has the hygral expansion of increase and the wet absorption of increase.Described first embodiment is that pozzuolanic adding obtains ideal density and processing characteristics with respect to the advantage of prior art, adds on similar weight percentage basis fashionablely simultaneously, and its hygral expansion is lower than conventional low density additives.In building products, wet-dried dimensional stability is that the quality and the wearing quality of finishing product is desired, particularly in standing the applications of serious climate change.Good dimensional stability makes at plate or building prevents that any possible slit of opening minimizes between wallboard or the backing plate.Good dimensional stability has also reduced because the plate disruptive possibility that the anti-wallboard of profile variation or backing plate and the stress that fixedly produces between the support framework of the finished product cause.
Following table 3 and 4 illustrations the test-results of FRC prescription and these prescriptions, more specifically proof adds pozzuolanic advantage and is to reduce density, and the characteristic hygral expansion that adds other low density additives on the identical weight basis is minimized.
3 are used for the prescription of table 4 test-results
Table 4 volcanic ash and perlitic hygral expansion are relatively
| Prescription | Describe | O.D. density (g/cm 3) | Hygral expansion % | % increases with respect to the contrast hygral expansion |
| B 2 | Contrast-no LDA | 1.33 | 0.18±0.02 | |
| K 1 | 7.5％VA | 1.11 | 0.17±0.02 | -5.5 |
| |
5% perlite | 1.22 | 0.22±0.02 | 22.2 |
1Hygral expansion is from being saturated to the variation of the product length under the drying condition.% changes the hygral expansion equation:
2In the whole description about embodiment preferred, prescription B is with comparing.But, because comprising the sample of the B that fills a prescription, none is used for all tests, in these test-results, can find the normal difference of any sample.
3Replace 7.5wt.% from contrast with 7.5% volcanic ash for prescription K, prescription B gathers materials.
Above table 4 has shown 10 " * 10 " result of the prototype board of strainer weight, the prescription that contains the 7.5wt.% volcanic ash and contain 5.0% perlite (available from the Harborlite 2000 of Harborlite company) of typical low density additives compared.Containing 5.0% perlitic prescription L increases by 22.2% with respect to the control group hygral expansion, in fact shows with respect to control group hygral expansion reduction greater than about 5% and contain 7.5% pozzuolanic prescription K.
Therefore, pozzuolanic adding provides than with equivalent or the better dimensional stability of typical density properties-correcting agent that adds than low weight percentage.This make volcanic ash with for conventional low density additives with equivalent or more a large amount add fashionablely, obtain lower density and better processability energy.
More specifically, can regulate pozzuolanic adding so that it is compared and show negligible hygral expansion difference with the pozzuolanic prescription that do not contain of equivalent.In one embodiment, preferably compare with the building products that is not contained pozzuolanic prescription manufacturing by equivalent, volcanic ash increases the hygral expansion of the finished product less than about 20%, more preferably reduces the hygral expansion of the finished product.In a preferred embodiment, the hygral expansion by the building products that contains pozzuolanic prescription manufacturing is about 0.17% or littler.
2. second embodiment-ceramic microspheres body
Second embodiment of the present invention comprises the ceramic microspheres body is added to Cement fibre cellulose fiber-enhancing material of construction.Can comprise second embodiment that preferably contains the ceramic microspheres body on pozzuolanic first embodiment,, comprise anti-freeze-thaw property and thermal shape stablity because the adding of microsphere has better wet fastness and other wearing quality advantage in the FRC material.Can recognize that the preferred embodiment of second embodiment is not limited to the microsphere or the material of construction of these types.Therefore, also consider the weighting agent and the material of construction of other type.
Microsphere can be natural, synthetic or byproduct.Described material can be a crystal, but more typically is noncrystal or glass.The microsphere of a preferred type is known ceramic microspheres body as cenosphere.Cenosphere is a kind of coal ash byproduct, and it generally is isolating from flying dust by flotation process, and wherein spheroid is floated to the water surface in settler, pond or lake.For example, described microsphere can be according to title
With
Buy, and can be from buying such as following supplier: PQ Corporation of Chattanooga, Tenn.; ZeelanIndustries Inc./3M of St.Paul, Minn.; Sphere Service, Inc.of Oak Ridge, Tenn.; With Advanced cement Technologies (A.C.T.) of Blaine, Washington.
The typical particle diameter of described microsphere is about 12-300 micron, and median particle size range is about 80-120 micron.Certainly these sizes can change between sample.Preferred microsphere generally comprises about 62%-65% silica (SiO
2), about 23%-26% aluminum oxide (Al
2O
3) and about 3.0%to 4.0% ferric oxide (Fe
2O
3).When in material of construction, adding microsphere, described microsphere is introduced the hole in described material, material can easily not filled by water, thereby is favourable material because it had lower saturated quality, improvement wet-do the anti-freeze-thaw property of dimensional stability and improvement.
Another of second embodiment preferably fill a prescription comprise the water-setting tackiness agent, gather materials, fiber, ceramic microspheres body and additive.Can recognize that the multiple component that is used for the preferred prescription of second embodiment comprises any above-mentioned listed material of each component about in the first embodiment.Described material can also be by listed in the first embodiment multiple ordinary method and condition of cure manufacturing.If adaptable words, preferred and first embodiment of raw material, method, step or condition is similar.
Described microsphere can be used for the multiple water-setting tackiness agent that has different ratios fully, gathers materials, the building products of microsphere and additive to be to obtain the optimum performance of concrete application (as wallboard, cover tile, fringing, soffit, lower floor's backing plate etc.).A kind of preferred compositions can comprise about 5%-80% portland cement, about 0%-80% silica, about 4.1%-15% Mierocrystalline cellulose, about 0%-10% additive and about 2%-90% microsphere.A concrete example of representative formula that contains microsphere is as follows:
Portland cement (tackiness agent) 28.7%
Silica (gathering materials) 50.3%
Mierocrystalline cellulose (fiber) 7%
Metal hydroxides (additive) 4%
Microsphere (LDA) 10%.
The per-cent that can recognize microsphere can rely on intended application and become.For example, high adding percentage (about at the most 90wt.%) microsphere is suitable for material of construction with fire-resistant grade of other system that needs certain type.A large amount of addings of microsphere provide low thermal shrinkage behavior to material.
Test-results
Density
Reduce density under the situation of not wearing quality of sacrificial fiber cement products supplies (as dimensional stability) and structural integrity with microsphere, improved total processing characteristics of thicker product.These attributes for thickness greater than particularly useful for about 3/8ths inches (＞3/8 ") products.Secondly, the product that contains microsphere is lighter, thereby the easy handling product that contains microsphere is easier to nail and carves/press to target shape.And the microsphere prescription reduces when plate (as 3/8-5/8) edge breaks or broken diffusing (if any) when being followed closely that keep to the side.
Following table 5 and 6 shown prescription and has been used for the test-results of FRC prescription, more specifically illustration microsphere added to prescription to improve the advantage of density and processing characteristics.
Table 5 is used for the prescription of table 6 test-results
| Prescription identification | Portland cement | Silica | Mierocrystalline cellulose | Metal hydroxides | Microsphere |
| The water-setting tackiness agent | Gather materials | Fiber | Additive | LDA | |
| B | 28.7 | 60.3 | 7.0 | 4.0 | |
| A | 28.7 | 50.3 | 7.0 | 4.0 | 10.0 |
Table 6 contains with the performance that does not contain microsphere and compares
| Test | Prescription A | 110% microsphere | Prescription B contrast does not have LDA |
| Density (equilibrium conditions) 2(g/cm 3) | 1.16 | 1.39 | |
| Nail penetrates mm 50mm (2 inches)=long standard deviation of nail of following closely in (equilibrium conditions) material | 47.0 0.9 | 31.7 1.4 |
110% microsphere replaces contrast among the prescription A, and 10% gathers materials among the prescription B.
2Equilibrium conditions-sample is adjusted under 73 ± 4 controlled normal atmosphere and 50 ± 5% humidity conditions.
Table 6 has shown that 3 ' * 5 ' Hatschek about prescription A and B makes the plate test-results.When with the prescription that does not contain microsphere of equivalent (prescription B) when comparing, the prescription that contains the 10wt.% microsphere reduces density about 15%, from 1.39g/cm
3To 1.16g/cm
3In addition, improved nail has been pushed easiness in the plate.Test shows that nail penetrates from 31.7mm and increases to 47.0mm, and wherein, 50mm representative nail spike long and in the cards penetrates.
In a word, these prototype tests and by the product that test is produced shown every adding 10% microsphere density reduce about 15% and significant nailability improve.Therefore, the prescription that does not contain microsphere with equivalent is compared, and add microsphere and can be advantageously the density of FRC material of construction be reduced greater than about 15%, even more preferably greater than about 30%.The present inventor considers the adding along with microsphere, and the density of material can be reduced to about 0.9g/cm
3(seeing table 10), more preferably even be low to moderate about 0.5g/cm
3
Wet-dried dimensional stability
As above-mentioned, on the basis that weight percent increases, the cured fiber cement formula that contains conventional density properties-correcting agent has the hygral expansion of increase and the absorption of increase.Preferred embodiment is to increase from wet to the hygral expansion of doing not the adding of microsphere that is used to reduce density with respect to an advantage of prior art.This is useful owing to the multiple reason described in first embodiment of front.
Following table 7 has shown the test-results that contains and do not contain 3 ' of microsphere * 5 ' Hatschek manufacturing plate.The prescription A that contains 10% microsphere compares with the prescription B that does not contain microsphere, keeps or has more preferably reduced hygral expansion.Prescription A and B are in last table 5.
Table 7 contains and does not contain the hygral expansion of microsphere and compares
| Test | Prescription A | 110% microsphere | Prescription B contrast does not have LDA |
| Density (equilibrium conditions) 2 (g/cm 3) | 1.16 | 1.39 | |
| Hygral expansion % changes | 0.15±0.02 | 0.16±0.02 |
110% microsphere replaces contrast among the prescription A, and 10% gathers materials among the prescription B.
2Equilibrium conditions-sample is adjusted under 73 ± 4 controlled normal atmosphere and 50 ± 5% humidity conditions.
Table 8-10 has shown prescription and has been used for 10 " * 10 " test-results of the prototype board of strainer weight, compare microsphere and increased the conventional density properties-correcting agent of hygral expansion.Conventional density properties-correcting agent comprises low bulk density calcium silicate hydrate (CSH) and expanded polystyrene, vermiculite, perlite, shale and clay.
Table 8 prescription of table 9 and 10 test-results
Following table 9 data presentation the conventional low density additives of 5% loading capacity, low bulk density CSH (from the Silasorb of Celite company), with respect to according to thing, prescription B has increased hygral expansion.
The hygral expansion of the low bulk density CSH of table 9
| Prescription identification | Describe | Equilibrium density 1(g/cm 3) | Hygral expansion % |
| B | Contrast | 1.41 | 0.162±0.02 |
| F 2 | 5.0% low bulk density CSH | 1.27 | 0.188±0.02 |
1Equilibrium conditions-sample is adjusted under the condition of 73 ± 4 controlled normal atmosphere and 50 ± 5% humidity
2 Prescription 5% among F is low, and bulk density CSH replaces contrast, 5% gather materials among the prescription B
Following table 10 has compared two kinds of prescriptions and identical alkali prescription, and a kind of 25wt.% microsphere that contains, another kind contain 25wt.% perlite (available from the perlitic Aztec XX of Aztec).Two kinds of perlites and microsphere prescription with the density of control formula C from 1.3g/cm
3Reduce to about 0.9g/cm
3, the hygral expansion of perlite prescription increases, and the hygral expansion of microsphere prescription reduces.
Table 10-microsphere and perlitic hygral expansion are relatively.
| Prescription | Describe | Equilibrium density (g/cm 3) | Hygral expansion % |
| C | Contrast | 1.31 | 0.230±0.02 |
| |
25% microsphere | 0.90 | 0.202±0.02 |
| |
25% perlite | 0.89 | 0.275±0.02 |
1Equilibrium conditions-sample is adjusted under the condition of 73 ± 4 controlled normal atmosphere and 50 ± 5% humidity
2For prescription D and E, microsphere replaces contrast, gathering materials and the water-setting tackiness agent among the prescription C.
Therefore, the adding of microsphere has the effect that keeps or reduce the finished product hygral expansion in the fiber cement formulations.Preferably, can regulate the adding of microsphere, comparing, hygral expansion be reduced about 5%, more preferably reduce about 10% or more with the similar prescription that does not contain microsphere.
Anti-freeze-thaw property
Anti-freeze-thaw property refer to material when standing the freezing and thaw cycle of multiple to the destructive tolerance.For example, concrete may be by frost, and the freezing and thaw cycle that particularly is repeated is destroyed.Destruction generally starts from breaking of surface and extends to inside gradually, may take place though the degree of depth is broken.Generally do not take place with freezing relevant destruction, unless have the water of capacity in the hole, and this destruction low water-with-cement ratio and low-permeability concrete in minimum.
Similar with high density concrete, freeze-thaw destruction is minimum in high-density fiber cement.In preferred embodiments, the adding of microsphere produces more low-density solidifying product in the FRC prescription, and this product keeps anti-freeze-thaw property, and place unlike the prior art is the anti-freeze-thaw property that the adding of density properties-correcting agent in the prescription has reduced material.
Fig. 1 and 2 has shown that 3 ' * 5 ' Hatschek of use MIP (mercury intrusion porosity determination) and BET (Brunauer, Emmett and Teller) method makes the graph of pore diameter distribution of plate.The pore size distribution of prescription after 147 freeze-thaw circulations that contains the 10wt.% microsphere changes littler than the variation of the prescription B that does not contain microsphere after 126 circulations.This has proved the tolerance of microsphere prescription to common freeze-thaw destructive structural changes.In order further to support the microsphere prescription to freeze-thaw destructive tolerance, Fig. 3 has shown that the Hatschek that contains the 10wt.% microsphere makes SEM (scanning electronic microscope) figure of plate (3 ' * 5 '), show the sign that after 147 freeze-thaw circulations, does not have degraded, and other wooden cement mixture generally has degraded in this stage.
The freeze-thaw test of Fig. 3 is finished according to following method: ASTM (USS test method) C666A, title are " Standard Test Method for Resistance ofConcrete to Rapid Freezing and Thawing. (concrete is to the standard test methods of the tolerance of quick cooling and thawing) ".This test method has two kinds of different processes, A and B.According to process A, soon sample is soaked in water and is carried out while quick freezing and thawing, melts fast to quick freezing in air with in water (process B).From freeze-thaw circulation, remove sample termly, and visual inspection degraded is as the breaking of entire sample and overall texture integrity, hygral expansion, spongy/humidity.When palliating degradation degree is that sample can not keep together and thereby can not remove sample when the building products from freeze-thaw circulation.
The high temperature dimensional stability
The thermal contraction that reduces material of construction prevents the high temperature stress tension force that exists in the building element.The hot dimensional stability of this improvement makes building element remain the fender of fire under building fire and can not break, separates and make fiery rapid diffusion.
Following table 11 and 12 has shown FRC prescription and 10 " * 10 " test-results of the prototype board of strainer weight, more specifically be illustrated in the prescription adding microsphere improving the advantage of high temperature dimensional stability.
Table 11-is used for the prescription of table 12 test-results
Table 12 microsphere and low bulk density CSH heat-shrinkable are relatively
| Prescription | Describe | Equilibrium density 2(g/cm 3) | Thermal contraction 1(％) |
| B | Contrast | 1.41 | 3.07 |
| F 3 | 5.0% low bulk density CSH | 1.21 | 7.27 |
| G 3 | 10.0% low bulk density CSH | 1.15 | 8.09 |
| A 3 | 10.0% microsphere | 1.15 | 4.41 |
| H 3 | 20.0% microsphere | 1.01 | 4.21 |
1The text that refers to following description about heat shrinkage test.
2Equilibrium conditions-sample is adjusted under the condition of 73 ± 4 controlled normal atmosphere and 50 ± 5% humidity
3The LDA of per-cent replaces contrast described in prescription F, G, A and the H, among the prescription B same percentage gather materials.
Under lower load level (as about 10-20%), microsphere makes in fiber cement formulations the elevated temperature heat that generally can take place when adding typical organic density properties-correcting agent shrink and minimizes.Table 12 expression gained about the prescription A that contains the 10wt.% microsphere the percentile result of thermal contraction to the prescription G that contains the low bulk density CSH (from the Silasorb of Celite company) of 10wt.%.(prescription B) compares with contrast, and two kinds of prescriptions all reduce density about 1.4-1.15g/cm
3, have the thermal contraction of almost twice in the prescription that contains microsphere but contain the prescription that hangs down bulk density CSH.And containing 20.0wt.% microsphere and density is about 1.0g/cm
3The hot contraction ratio of prescription H only contain 5.0% low bulk density CSH (from the Silasorb of Celite company) and density is about 1.2g/cm
3Prescription F little more than 40%.
Using thermomechanical analyzer (TMA) to measure elevated temperature heat shrinks.Sample is divided into the 25mm that 10 parts of thickness are at most 12mm.The temperature of saturated sample rises to 950 ℃ with 20 ℃/minute speed, with grand expansion probe working sample profile.The total profile variation from 25 ℃ to 950 ℃ is regarded in thermal contraction as, and is reported as the percentage of total initial length.
Another advantage of using microsphere in fiber-cement formula is thermal contraction with increasing of adding of microsphere and reduces.The thermal contraction of microsphere and the weight percent of adding are inversely proportional to, and the thermal contraction of conventional density modification is directly proportional with the weight percent of adding.Therefore, the prescription of the low add-on of recipe ratio (about at the most 20wt.%) of the microsphere of higher add-on (about at the most 90wt.%) has lower thermal contraction.
Following table 13 provides the prescription of the microsphere with high add-on, and table 14 provides elevated temperature heat to shrink the result.Have 70 and the thermal contraction result that produces of the formula I of 90wt.% microsphere add-on and J be respectively about 2.7% and 1.1%.The thermal contraction of formula I and J records by the following method: cut the long sample of about 10 * 10 * 40mm, oven drying was toasted 1 hour under 1000 ℃ temperature with retort furnace, and is cooled to the oven drying condition.By measuring the overall length differential of oven drying to 1000 ℃, and determine thermal contraction per-cent divided by initial oven drying length.
Table 13 is used for table 14 result's prescription
The thermal contraction of the microsphere prescription of the high add-on of table 14
| Prescription identification | Thermal contraction % |
| I | 2.7 |
| J | 1.1 |
Therefore, be used for the embodiment of fiber cement formulations at 20% microsphere, compare with the product by the prescription manufacturing that does not contain microsphere of equivalent, the thermal contraction increase of the finished product is lower than about 50%.As above-mentioned, along with the percentile increase of microsphere, thermal contraction per-cent reduces, even be reduced to following certain a bit: wherein, compare with the product that does not contain microsphere, the finished product that contain microsphere show the thermal contraction of reduction, preferably reduce about 10%-about 70%.More specifically, contain the thermal contraction of product of microsphere preferably less than about 4%.
The 3rd embodiment-microsphere and other additive
The 3rd embodiment of the present invention relates to the ceramic microspheres body of in Cement fibre cellulose fiber-enhancing material of construction adding and volcanic ash and/or the combination of other low density additives.See the detailed description of first and second embodiments respectively about the description of volcanic ash and ceramic microspheres body.If the FRC product can obtain the density of low scope and the wet fastness and the durability of improvement, then contain microsphere and low density additives blend the 3rd embodiment than first embodiment that contains VA more preferably.But second embodiment that adds microsphere separately is more preferred than the 3rd embodiment, provides best durability because add microsphere separately.The relative importance that preferably depends on wearing quality in concrete application of second embodiment to the, three embodiments.
Be similar to first and second embodiments, one of the 3rd embodiment preferred prescription comprises the water-setting tackiness agent, gathers materials, fiber, ceramic microspheres body, low density additives and other additive.Can recognize that the various ingredients in the 3rd embodiment can comprise any above-mentioned about the listed material of various components in first embodiment.The 3rd embodiment can also be by listed in the first embodiment and described ordinary method and condition of cure manufacturing.If adaptable words, preferred and first embodiment of raw material, method, step or condition is similar.
The blending of microsphere and VA and/or low density additives can be used for multiple water-setting tackiness agent with different ratios, gathers materials, the building products of low density additives and other additives to be to obtain best concrete application performance (as wallboard, cover tile, fringing, soffit, tile lower floor backing plate etc.).A preferred compositions in the 3rd embodiment can comprise about 5%-80% portland cement, about 0%-80% silica, about 4.1%-15% Mierocrystalline cellulose, about 0%-10% additive and about 2%-60% microsphere and other typical LDA.A specific examples of representative formula that contains microsphere and typical low density additives is as follows:
Portland cement (tackiness agent) 28.7%
Silica (gathering materials) 50.3%
Mierocrystalline cellulose (fiber) 7%
Metal hydroxides (additive) 4%
Microsphere (LDA) 10%
Volcanic ash (LDA) 5%
Can recognize that microsphere and other LDA ' s comprise that the percentage of VA can depend on intended application and becomes.
Test-results
The wearing quality of holding concurrently than low density
The blending of microsphere and VA or other low density modified dose of typical case as low bulk density CSH or expanded polystyrene pearl, clay, vermiculite, perlite and shale has many advantages.An advantage is that total weight percent add-on that then can be lower (comparing with the situation that only contains microsphere) obtains quite or lower density if the density of VA and other typical LDA is lower than microsphere.The low adding ratio of blend is more economical, and microsphere minimizes the hygral expansion relevant with the adding of typical organic density properties-correcting agent.Another advantage of microsphere and other typical low density additives blending is that the FRC product can obtain lower density range, and keeps the manipulation strength of competent product.Therefore, can add the microsphere of higher load level (based on weight percent) and the composition of other LDA, typical low density additives is minimized the detrimental action of dimensional stability and total wearing quality.
But adding low density additives in all embodiments as herein described is not the unique method of reduction based on the density of the prescription of cement.By cement and gathering materials form but not fibre-bearing or or the density range of the prescription of low density additives be about 1.8-2.1g/cm
3It is favourable adding fiber in the cement formula, because fiber also reduces density except the product that intensity is provided and is suitable for being followed closely.Contain greater than the about density range of the fiber cement formulations of 4wt.% fiber and generally be approximately 1.2 to 1.4g/cm
3Find, contain about 4wt.% or lower fiber the FRC prescription do not have competent intensity and finishing ductility.These FRC products are generally too crisp, and produce when being followed closely in fitment process and break and explosion.Selectively, may not expect in some application, because the fiber in the FRC prescription causes hygral expansion, perviousness to increase, and sacrifice wearing quality generally greater than the fiber add-on of about 15wt.%.
Therefore, must advantageously measure the correct fiber balance of FRC product, it depends on the thickness and the shape of specific product.In one embodiment, the fiber percentage of preferably approximately 4.1%-15%.Low density additives is added to the FRC prescription to be reduced so that the additional density that adds with respect to fiber to be provided.But in general, LDA adds many more, and the strength property of FRC product is low more.Therefore, it is limited that LDA adds, because the FRC product should preferably be kept for the minimum strength of sufficient operation and finishing.The load level of multiple factor such as LDA, concrete LDA and the shape of concrete FRC product are depended in maximum LDA adding.Required minimum strength also depends on the shape and the thickness of FRC product.Fig. 4 has shown microsphere wt.% add-on and 10 " * 10 " density of the prototype board of strainer weight and the general contact of intensity.
Following table 15-17 illustration FRC prescription and 10 " * 10 " test-results of the prototype board of strainer weight, more specifically illustration with microsphere with other low density additives blending to obtain the low density scope and to improve the advantage of wearing quality.
Table 15 is used for the prescription of table 16 and 17
The prescription O of the blend that table 16 compared the prescription M that contains the 12wt.% microsphere, contain 9wt.% microsphere and low bulk density CSH and do not contain the density of the contrast of low density additives.Low bulk density CSH used among the prescription O uses the method production of adopting silica, lime and water by James Hardie, and described method produces the low bulk density material that is essentially tobermorite form A SH.Further details is described in the U.S. Patent Application Serial Number of submitting on April 9th, 1,998 09/058,444, quotes it here in full as a reference.Compare with contrast, the reduction of the density of prescription M and O does not have tangible difference, but total add-on of low density additives and blend (prescription O) is littler by 3% than the prescription M that only contains microsphere.For prescription M and O, the nuance of water-setting tackiness agent and the wt.% that gathers materials is to not influence of density performance.
Table 16-density relatively
| Prescription identification | Describe | O.D. density (g/cm 3) |
| B | Contrast-no LDA | 1.31 |
| |
12% microsphere | 1.09 |
| O 1 | 6% microsphere, 3% low bulk density CSH | 1.11 |
1The LDA of the described per-cent of LDA replaces not containing the contrast of LDA among prescription M and the O, and equal percentage gathers materials among the prescription B
Following table 17 shown four kinds main only exist aspect the add-on of multiple low density additives change 10 " * 10 " strainer weight prototype board and do not contain the test-results of the contrast of any low density additives.The result show contain the 12wt.% microsphere prescription M with respect to contrast with density from 1.35g/cm
3Reduce to 1.16g/cm
3, but the prescription N with the microsphere of 11wt.% add-on/low bulk density CSH (from the Silasorb of Celite) blend further reduces to 1.10g/cm with density
3And the hygral expansion that contains the prescription N of 11wt.% microsphere/low bulk density CSH blend and do not contain the contrast of low density additives does not have significant difference, is respectively 0.167 and 0.163%.By contrast, the prescription G that only contains the low bulk density CSH of 10wt.% provides the approximately density identical with the prescription N of 11wt.% blend, but has obvious higher 0.197% hygral expansion.The water-setting tackiness agent does not influence density or hygral expansion performance with the trickle wt.% difference of gathering materials in the prescription.
Table 17-hygral expansion relatively
| Prescription identification | Describe | O.D. density (g/cm 3) | Hygral expansion % |
| B | Contrast-no LDA | 1.35 | 0.163±0.02 |
| |
12% microsphere | 1.16 | 0.156±0.02 |
| N | 6% microsphere, 5% low bulk density CSH | 1.10 | 0.167±0.02 |
| |
10% low bulk density CSH | 1.12 | 0.197±0.02 |
1The LDA of per-cent replaces not containing the contrast of LDA described in prescription M, N and the G, and equal percentage gathers materials among the prescription B.
Conclusion
In general, can recognize embodiment preferred of the present invention, more specifically, the fiber-enhancing material of construction that contains the combination of additive volcanic ash, ceramic microspheres body or microsphere, volcanic ash and/or additive has many advantages that are better than prior art.These materials have the low density that is lower than conventional fibre cement works product.Thereby the thicker product that can produce light easy handling like this, cuts, followed closely and fit up (as 3/8 "-1.0 ").
Described material also has the wet-dried dimensional stability of improvement, and improves the wearing quality of described material of construction, thereby the buildings wall dunnage can exceedingly not shunk and break.And, when changing dry season over to after humidity changes or from wetting, the excessive space between wall dunnage or the backing plate can not open.
About prescription and the building products that comprises the ceramic microspheres body at least, different with most inorganic density properties-correcting agent fibrocement material is, the anti-freeze-thaw property of described material is than keeping under the low density.This gives these materials at the excellent durability that experiences under the frequent freezing and thaw condition.
These comprise the material of microsphere because it has the thermal shape stablity with respect to the improvement of low density additives, thereby also have the fire performance of improvement.Therefore, these materials stably are used as a kind of building slab in building fire, thereby make described material can remain the fender of fire, and can not break, separate and make fiery rapid diffusion.
Described embodiment preferred is used for multiple building products to be used, and includes but not limited to that buildings prevents wallboard (inside and outside), tile backing plate (wall and floor), wallboard, soffit, fringing, cover tile, fence and paving.The example of above embodiment that exemplifies and describe as just some preferred embodiment of the present invention is provided.Those skilled in the art can do multiple change or modification to embodiment as herein described under the situation that does not deviate from the spirit and scope of the present invention.
Claims (17)
1. material of construction is characterized in that:
The density that described material of construction has is 1.2g/cm
3Or littler, and the hygral expansion that has is 0.202% or littler; Wherein, described material of construction is made with a kind of prescription, and described prescription comprises:
The water-setting tackiness agent;
Gather materials;
The cellulosic fibre of 4.1-15wt.%; And
The ceramic microspheres body, wherein, described ceramic microspheres body reduces the density of described material of construction and keeps the low hygral expansion of described material of construction.
2. material of construction according to claim 1, wherein, described microsphere is a cenosphere.
3. material of construction according to claim 1 further comprises calcium silicate hydrate.
4. material of construction according to claim 1, wherein, the median particle diameter of described ceramic microspheres body is between 20-120 μ m.
5. material of construction according to claim 1, wherein, described gathering materials is that silica gathers materials.
6. material of construction according to claim 5, wherein, described silica gathers materials and accounts for the 80wt.% that is at most of described material of construction.
7. material of construction according to claim 1, wherein, described water-setting tackiness agent comprises portland cement.
8. material of construction according to claim 7, it comprises the portland cement of 5-80wt.%.
9. material of construction according to claim 1, wherein, the density of described material of construction is 0.5 to 1.2g/cm
3
10. material of construction according to claim 1, wherein, the density of described material of construction is 0.9 to 1.1g/cm
3
11. material of construction according to claim 1 is wherein compared with the equivalent prescription that does not have microsphere, the described microsphere of every adding 10%, and described ceramic microspheres body reduces by 15% or more with the density of described material of construction.
12. a method that forms the low density material of construction, it comprises:
Blend fiber cement formula and water are with pulping, and described prescription comprises: the water-setting tackiness agent, gather materials, cellulosic fibre, ceramic microspheres body;
This slurry is processed into green formed article; With
This green formed article is solidify to form the low density material of construction, and the density that described low density material of construction has is 1.2g/cm
3Or littler, wherein said ceramic microspheres body keeps the hygral expansion level of described low density material of construction 0.202% or littler, and wherein said fiber cement formulations comprises the cellulosic fibre of 4.1-15wt.%.
13. method according to claim 12, wherein, described gathering materials is that silica gathers materials.
14. method according to claim 12, wherein, the density of described low density material of construction is 0.5 to 1.2g/cm
3
15. method according to claim 12, wherein, the density of described low density material of construction is 0.9 to 1.1g/cm
3
16. method according to claim 12 wherein, is solidified described article by hot-pressing processing.
17. method according to claim 12 wherein, is processed into green formed article with described slurry and comprises with Hatschek plate method.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18923500P | 2000-03-14 | 2000-03-14 | |
| US60/189,235 | 2000-03-14 | ||
| US09/803,456 | 2001-03-09 |
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| CN01808151A Division CN1426382A (en) | 2000-03-14 | 2001-03-09 | Fiber cement building materials with low density additives |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103951354A (en) * | 2014-05-15 | 2014-07-30 | 清华大学 | Cement-based buoyancy material and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103951354A (en) * | 2014-05-15 | 2014-07-30 | 清华大学 | Cement-based buoyancy material and preparation method thereof |
| CN103951354B (en) * | 2014-05-15 | 2016-02-10 | 清华大学 | Cement based buoyancy material and preparation method thereof |
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