US20150099409A1 - Cement Board - Google Patents
Cement Board Download PDFInfo
- Publication number
- US20150099409A1 US20150099409A1 US14/045,615 US201314045615A US2015099409A1 US 20150099409 A1 US20150099409 A1 US 20150099409A1 US 201314045615 A US201314045615 A US 201314045615A US 2015099409 A1 US2015099409 A1 US 2015099409A1
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- United States
- Prior art keywords
- cement
- fiber material
- fiber
- board
- grain
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
- E04C2/06—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres reinforced
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/26—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
Definitions
- the present invention relates to a cement board. More particularly, this invention relates to a cement board, which is strong and light.
- cement boards are very heavy for its main component, that is, cement. Such heaviness has been a serious problem in using them.
- the present invention contrives to solve the disadvantages of the prior art.
- An object of the invention is to provide a cement board.
- Another object of the invention is to provide a cement board, which is strong and light.
- An aspect of the invention provides a cement board.
- the cement board comprises grain material, sand grains, fiber material, fiber glass, cement, plastic cement, glue, and ammonium dichromate.
- the grain material includes aluminum silicate grain, finely crushed bones, shells, dry stall pumice, perlite, coral, and coal ash.
- the fiber material includes needle-shaped straws, hemp, reeds, bamboo tree, plastic threads, and chaffs, wherein the fiber material processed with wood preservative and fire deterrant.
- the grain material, the fiber material, the fiber glass, the cement, the plastic cement, the glue, and the ammonium dichromate are mixed substantially evenly and formed into a board by pressure.
- the volume ratio of the cement and the plastic cement to the grain material, the sand grains, and the fiber material may be about 10% to 20% of both in total. Preferably, the volume ratio is about 15% of both in total.
- the volume ratio of the cement to the plastic cement may be about 50% of both in total.
- the volume ratio of the grain material to the fiber material may be about 50% to 70% of both in total. Preferably, the volume ratio is about 65% of both in total.
- the cement board may further comprise a rust-free-coated metal mesh disposed in a middle of the cement board, wherein the rust-free-coated metal mesh has a plurality of eyes of a predetermined size of substantial portion of an average length of the fiber material.
- the glue may be transparent before hardening.
- Another aspect of the invention provides a method for manufacturing cement board.
- the method comprises steps for:
- the volume ratio of the cement and the plastic cement to the grain material, the sand grains, and the fiber material may be about 10% to 20% of both in total, preferably 15%.
- the volume ratio of the cement to the plastic cement may be about 50% of both in total.
- the volume ratio of the grain material to the fiber material may be about 50% to 70% of both in total, preferably 65%.
- the method may further comprise a step for inserting a metal mesh in a middle of the mixed material before the step for forming.
- the method may further comprise a step for coating the metal mesh so as to make the metal mesh rust-free.
- the advantages of the present invention are: (1) the cement board is easy and cheap to manufacture; and (2) the cement board is very strong and light.
- FIG. 1 is a perspective view showing a cement board according to an embodiment of the present invention
- FIG. 2 is a cross-sectional view of FIG. 1 along the line II-II according to an embodiment of the present invention
- FIG. 3 is a cross-sectional view of FIG. 1 along the line II-II according to another embodiment of the present invention.
- FIG. 4 is an exemplary diagram showing inside of a cement board according to an embodiment of the present invention.
- FIG. 5 is a partial cut-out view of FIG. 1 according to still another embodiment of the present invention.
- FIG. 6 is a flow chart showing a method for manufacturing a cement board to still another embodiment of the present invention.
- FIGS. 1-5 show a cement board according to embodiments of the invention
- FIG. 6 shows a method for manufacturing the cement board according to still another embodiment of the invention.
- An aspect of the invention provides a cement board 100 as shown in FIGS. 1-5 .
- the cement board 100 comprises grain material 10 , sand grains 12 , fiber material 20 , fiber glass 22 , cement 30 , plastic cement 32 , glue 40 , and ammonium dichromate 50 .
- the grain material 10 includes aluminum silicate grain, finely crushed bones, shells, dry stall pumice, perlite, coral, and coal ash, or their any possible combination.
- the grain material 10 is mineral material that is light in weight, such that the cement board 100 would be very light compared to other conventional cement or concrete boards.
- the fiber material 20 includes needle-shaped straws, hemp, reeds, bamboo tree, plastic threads, and chaffs, or any possible combination, and the fiber material processed with wood preservative and fire deterrant.
- the fiber material 20 is also light in weight, of a length longer than width, and strong against tensile force.
- the glue 40 performs functions of holding the various components of the board together.
- the grain material 10 , the fiber material 20 , the fiber glass 22 , the cement 30 , the plastic cement 32 , the glue 40 , and the ammonium dichromate 50 are mixed substantially evenly and formed into a board 100 by pressure.
- the volume ratio of the cement 30 and the plastic cement 32 to the grain material 10 , the sand grains 12 , and the fiber material 20 may be about 10% to 20% of both in total. Preferably, the volume ratio is about 15% of both in total.
- the grain material 10 may includes the sand grains 12 as a part.
- the volume ratio of the cement 30 to the plastic cement 32 may be about 50% of both in total.
- the cement 30 may includes the plastic cement 32 as a part.
- the volume ratio of the grain material 10 to the fiber material 20 may be about 50% to 70% of both in total. Preferably, the volume ratio is about 65% of both in total.
- the cement board 100 may further comprise a rust-free-coated metal mesh 60 disposed in a middle of the cement board 100 , and the rust-free-coated metal mesh 60 has a plurality of eyes 62 of a predetermined size of substantial portion of an average length of the fiber material 20 as shown in FIG. 3 .
- each of the plurality of eyes 62 may be of the size of about 1 ⁇ 4 to 1 ⁇ 2 of an average length of the fiber material 20 .
- each of the plurality of eyes 62 may be of the size of about 1.5 to 2.5 of an average length of the fiber material 20 .
- each of the plurality of eyes 62 may take any size between about 1 ⁇ 4-1 ⁇ 2 to about 1.5-2.5 of an average length of the fiber material 20 , such that some of the fiber material 20 may be disposed over through the eyes 62 so as to bolster the engagement of both sides of the rust-free-coated metal mesh 60 therethrough.
- the glue 40 may be transparent before hardening.
- the glue 40 may be provided in grain or grains, which are melted in water and mixed with the other components evenly.
- the grain material 10 may include the dry stall pumice 14 having different size from the other components of the grain material 10 as shown in FIG. 4 .
- the fiber material 20 may include any tree chips other than the bamboo tree.
- FIG. 5 a portion of the cement board 100 is taken out to show the metal mesh 50 embedded in the cement board 100 .
- the metal mesh 50 may be a wire mesh. Also, the shape of the eyes may be square, rectangle, hexagon, etc.
- the eye size of the metal mesh 50 is from about 1 ⁇ 3 to about 2 of the size of an average length of the fiber material.
- the wood preservative keeps the wood or plant material from decaying or being degraded by termites.
- the even mixture of the glue and the ammonium dichromate provides the cement board with waterproof.
- Another aspect of the invention provides a method for manufacturing cement board as shown in FIG. 6 .
- the method comprises steps for:
- the volume ratio of the cement and the plastic cement to the grain material, the sand grains, and the fiber material may be about 10% to 20% of both in total, preferably 15%.
- the volume ratio of the cement to the plastic cement may be about 50% of both in total.
- the volume ratio of the grain material to the fiber material may be about 50% to 70% of both in total, preferably 65%.
- the method may further comprise a step for inserting a metal mesh in a middle of the mixed material before the step for forming.
- the method may further comprise a step for coating the metal mesh so as to make the metal mesh rust-free.
- the reeds may be placed with other fibrous plants with strong fibers in them.
Abstract
A cement board includes grain material, sand grains, fiber material, fiber glass, cement, plastic cement, glue, and ammonium dichromate. The grain material includes aluminum silicate grain, bones, shells, dry stall pumice, perlite, coral, and coal ash. The fiber material includes straws, hemp, reeds, bamboo tree, plastic threads, and chaffs processed with wood preservative and fire deterrant. The the grain material, the fiber material, the fiber glass, the cement, the plastic cement, the glue, and the ammonium dichromate are mixed substantially evenly and formed into a board. The ratio of the cement and the plastic cement to the grain material, the sand grains, and the fiber material may be about 10% to 20%. The ratio of the cement to the plastic cement may be about 50% of both in total. The volume ratio of the grain material to the fiber material may be about 50% to 70% of both in total.
Description
- The present invention relates to a cement board. More particularly, this invention relates to a cement board, which is strong and light.
- Usually, cement boards are very heavy for its main component, that is, cement. Such heaviness has been a serious problem in using them.
- Accordingly, a need for a cement board has been present for a long time considering the expansive demands in the everyday life. This invention is directed to solve these problems and satisfy the long-felt need.
- The present invention contrives to solve the disadvantages of the prior art.
- An object of the invention is to provide a cement board.
- Another object of the invention is to provide a cement board, which is strong and light.
- An aspect of the invention provides a cement board.
- The cement board comprises grain material, sand grains, fiber material, fiber glass, cement, plastic cement, glue, and ammonium dichromate.
- The grain material includes aluminum silicate grain, finely crushed bones, shells, dry stall pumice, perlite, coral, and coal ash.
- The fiber material includes needle-shaped straws, hemp, reeds, bamboo tree, plastic threads, and chaffs, wherein the fiber material processed with wood preservative and fire deterrant.
- The the grain material, the fiber material, the fiber glass, the cement, the plastic cement, the glue, and the ammonium dichromate are mixed substantially evenly and formed into a board by pressure.
- The volume ratio of the cement and the plastic cement to the grain material, the sand grains, and the fiber material may be about 10% to 20% of both in total. Preferably, the volume ratio is about 15% of both in total.
- The volume ratio of the cement to the plastic cement may be about 50% of both in total.
- The volume ratio of the grain material to the fiber material may be about 50% to 70% of both in total. Preferably, the volume ratio is about 65% of both in total.
- The cement board may further comprise a rust-free-coated metal mesh disposed in a middle of the cement board, wherein the rust-free-coated metal mesh has a plurality of eyes of a predetermined size of substantial portion of an average length of the fiber material.
- The glue may be transparent before hardening.
- Another aspect of the invention provides a method for manufacturing cement board.
- The method comprises steps for:
- mixing and graining finely crushed bones, shells, dry stall pumice, perlite, coral, and coal ash to obtain a grain mixture;
- mixing the first grain mixture with aluminum silicate grain and sand grains to obtain a grain material;
- cutting straws, hemp, reeds, bamboo tree, plastic threads into a fiber mixture of predetermined length;
- mixing the fiber mixture with chaffs and immersing them in wood preservative for about 48 hours to obtain wood-preservative-treated fiber mixture;
- drying the wood-preservative-treated fiber mixture;
- immersing the dried wood-preservative-treated fiber mixture in a fire deterrant and drying them to obtain a final fiber mixture;
- mixing the grain material, the dried final fiber, and fiber glass, ammonium dichromate, and glue dissolved in and boiled with water;
- forming a board in a predetermined thickness by applying pressure; and
- aging the formed board in steam of predetermined temperature.
- The volume ratio of the cement and the plastic cement to the grain material, the sand grains, and the fiber material may be about 10% to 20% of both in total, preferably 15%.
- The volume ratio of the cement to the plastic cement may be about 50% of both in total.
- The volume ratio of the grain material to the fiber material may be about 50% to 70% of both in total, preferably 65%.
- The method may further comprise a step for inserting a metal mesh in a middle of the mixed material before the step for forming.
- The method may further comprise a step for coating the metal mesh so as to make the metal mesh rust-free.
- The advantages of the present invention are: (1) the cement board is easy and cheap to manufacture; and (2) the cement board is very strong and light.
- Although the present invention is briefly summarized, the fuller understanding of the invention can be obtained by the following drawings, detailed description and appended claims.
- These and other features, aspects and advantages of the present invention will become better understood with reference to the accompanying drawings, wherein:
-
FIG. 1 is a perspective view showing a cement board according to an embodiment of the present invention; -
FIG. 2 is a cross-sectional view ofFIG. 1 along the line II-II according to an embodiment of the present invention; -
FIG. 3 is a cross-sectional view ofFIG. 1 along the line II-II according to another embodiment of the present invention; -
FIG. 4 is an exemplary diagram showing inside of a cement board according to an embodiment of the present invention; -
FIG. 5 is a partial cut-out view ofFIG. 1 according to still another embodiment of the present invention; and -
FIG. 6 is a flow chart showing a method for manufacturing a cement board to still another embodiment of the present invention. -
FIGS. 1-5 show a cement board according to embodiments of the invention, andFIG. 6 shows a method for manufacturing the cement board according to still another embodiment of the invention. - An aspect of the invention provides a
cement board 100 as shown inFIGS. 1-5 . - The
cement board 100 comprisesgrain material 10,sand grains 12,fiber material 20,fiber glass 22, cement 30, plastic cement 32, glue 40, and ammonium dichromate 50. - The
grain material 10 includes aluminum silicate grain, finely crushed bones, shells, dry stall pumice, perlite, coral, and coal ash, or their any possible combination. In general, thegrain material 10 is mineral material that is light in weight, such that thecement board 100 would be very light compared to other conventional cement or concrete boards. - The
fiber material 20 includes needle-shaped straws, hemp, reeds, bamboo tree, plastic threads, and chaffs, or any possible combination, and the fiber material processed with wood preservative and fire deterrant. In general, thefiber material 20 is also light in weight, of a length longer than width, and strong against tensile force. - The glue 40 performs functions of holding the various components of the board together.
- The the
grain material 10, thefiber material 20, thefiber glass 22, the cement 30, the plastic cement 32, the glue 40, and the ammonium dichromate 50 are mixed substantially evenly and formed into aboard 100 by pressure. - The volume ratio of the cement 30 and the plastic cement 32 to the
grain material 10, thesand grains 12, and thefiber material 20 may be about 10% to 20% of both in total. Preferably, the volume ratio is about 15% of both in total. - In certain embodiments, the
grain material 10 may includes thesand grains 12 as a part. - The volume ratio of the cement 30 to the plastic cement 32 may be about 50% of both in total.
- In certain embodiments, the cement 30 may includes the plastic cement 32 as a part.
- The volume ratio of the
grain material 10 to thefiber material 20 may be about 50% to 70% of both in total. Preferably, the volume ratio is about 65% of both in total. - The
cement board 100 may further comprise a rust-free-coatedmetal mesh 60 disposed in a middle of thecement board 100, and the rust-free-coatedmetal mesh 60 has a plurality ofeyes 62 of a predetermined size of substantial portion of an average length of thefiber material 20 as shown inFIG. 3 . - In certain embodiments, each of the plurality of
eyes 62 may be of the size of about ¼ to ½ of an average length of thefiber material 20. - In certain other embodiments, each of the plurality of
eyes 62 may be of the size of about 1.5 to 2.5 of an average length of thefiber material 20. - Therefore, each of the plurality of
eyes 62 may take any size between about ¼-½ to about 1.5-2.5 of an average length of thefiber material 20, such that some of thefiber material 20 may be disposed over through theeyes 62 so as to bolster the engagement of both sides of the rust-free-coatedmetal mesh 60 therethrough. - The glue 40 may be transparent before hardening. In certain embodiments, the glue 40 may be provided in grain or grains, which are melted in water and mixed with the other components evenly.
- In certain embodiments, the
grain material 10 may include thedry stall pumice 14 having different size from the other components of thegrain material 10 as shown inFIG. 4 . - In certain embodiments, the
fiber material 20 may include any tree chips other than the bamboo tree. - In
FIG. 5 , a portion of thecement board 100 is taken out to show the metal mesh 50 embedded in thecement board 100. - The metal mesh 50 may be a wire mesh. Also, the shape of the eyes may be square, rectangle, hexagon, etc.
- And, the eye size of the metal mesh 50 is from about ⅓ to about 2 of the size of an average length of the fiber material.
- The wood preservative keeps the wood or plant material from decaying or being degraded by termites.
- The even mixture of the glue and the ammonium dichromate provides the cement board with waterproof.
- Another aspect of the invention provides a method for manufacturing cement board as shown in
FIG. 6 . - The method comprises steps for:
- mixing and graining finely crushed bones, shells, dry stall pumice, perlite, coral, and coal ash to obtain a grain mixture (S10);
- mixing the first grain mixture with aluminum silicate grain and sand grains to obtain a grain material (S20);
- cutting straws, hemp, reeds, bamboo tree, plastic threads into a fiber mixture of predetermined length (S30);
- mixing the fiber mixture with chaffs and immersing them in wood preservative for about 48 hours to obtain wood-preservative-treated fiber mixture (S40);
- drying the wood-preservative-treated fiber mixture (S50);
- immersing the dried wood-preservative-treated fiber mixture in a fire deterrant and drying them to obtain a final fiber mixture (S60);
- mixing the grain material, the dried final fiber, and fiber glass, ammonium dichromate, and glue dissolved in and boiled with water (S70);
- forming a board in a predetermined thickness by applying pressure (S80); and
- aging the formed board in steam of predetermined temperature (S90).
- The volume ratio of the cement and the plastic cement to the grain material, the sand grains, and the fiber material may be about 10% to 20% of both in total, preferably 15%.
- The volume ratio of the cement to the plastic cement may be about 50% of both in total.
- The volume ratio of the grain material to the fiber material may be about 50% to 70% of both in total, preferably 65%.
- The method may further comprise a step for inserting a metal mesh in a middle of the mixed material before the step for forming.
- The method may further comprise a step for coating the metal mesh so as to make the metal mesh rust-free.
- In certain embodiments, the reeds may be placed with other fibrous plants with strong fibers in them.
- While the invention has been shown and described with reference to different embodiments thereof, it will be appreciated by those skilled in the art that variations in form, detail, compositions and operation may be made without departing from the spirit and scope of the invention as defined by the accompanying claims.
Claims (12)
1. A cement board comprising:
grain material including finely crushed bones, seashells dry stall pumice, and coal ash;
sand grains;
fiber material including hemp, bamboo tree, and plastic threads, wherein the fiber material further comprises wood preservative and fire deterrant;
fiber glass;
cement;
plastic cement;
glue; and
ammonium dichromate,
wherein the the grain material, the fiber material, the fiber glass, the cement, the plastic cement, the glue, and the ammonium dichromate are mixed substantially evenly and formed into a board by pressure,
wherein the volume ratio of the cement and the plastic cement to the grain material, the sand grains, and the fiber material is about 10:90 to 20:80.
2. (canceled)
3. The cement board of claim 1 , wherein the volume ratio of the cement and the plastic cement to the grain material, the sand grains, and the fiber material is about 15:85.
4. The cement board of claim 1 , wherein the volume ratio of the cement to the plastic cement is about 50:50.
5. The cement board of claim 1 , wherein the volume ratio of the grain material to the fiber material is about 50:50 to 70:30.
6. The cement board of claim 5 , wherein the volume ratio of the grain material to the fiber material is about 65:35.
7. The cement board of claim 1 , further comprising a rust-free-coated metal mesh disposed in a middle of the cement board, wherein the rust-free-coated metal mesh has a plurality of eyes of a predetermined size, wherein the predetermined size is of substantial portion of an average length of the fiber material.
8. The cement board of claim 7 , wherein the metal mesh is a wire mesh.
9. The cement board of claim 7 , wherein the eye size is from about ⅓ to about 2 of the size of an average length of the fiber material.
10. The cement board of claim 1 , wherein the glue is transparent before hardening.
11. The cement board of claim 10 , wherein the glue is provided as evenly mixed.
12.-20. (canceled)
Priority Applications (1)
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US14/045,615 US20150099409A1 (en) | 2013-10-03 | 2013-10-03 | Cement Board |
Applications Claiming Priority (1)
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US14/045,615 US20150099409A1 (en) | 2013-10-03 | 2013-10-03 | Cement Board |
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US20150099409A1 true US20150099409A1 (en) | 2015-04-09 |
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ID=52777301
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US14/045,615 Abandoned US20150099409A1 (en) | 2013-10-03 | 2013-10-03 | Cement Board |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9790703B1 (en) | 2016-08-16 | 2017-10-17 | Go Team CCR LLC | Methods of utilizing coal combustion residuals and structures constructed using such coal combustion residuals |
US9988317B2 (en) | 2016-08-16 | 2018-06-05 | Go Team CCR LLC | Structures constructed using coal combustion materials |
ES2715615A1 (en) * | 2017-12-05 | 2019-06-05 | Sitja Gratacos Angel | PIECE, PROCEDURE FOR YOUR TRAINING AND USES OF THE SAME (Machine-translation by Google Translate, not legally binding) |
Citations (1)
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US6933038B2 (en) * | 2000-11-06 | 2005-08-23 | Institute Of Paper Science And Technology, Inc. | Fiber reinforced mineral-based materials and methods of making the same |
-
2013
- 2013-10-03 US US14/045,615 patent/US20150099409A1/en not_active Abandoned
Patent Citations (1)
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US6933038B2 (en) * | 2000-11-06 | 2005-08-23 | Institute Of Paper Science And Technology, Inc. | Fiber reinforced mineral-based materials and methods of making the same |
Non-Patent Citations (3)
Title |
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"About Coal Ash", http://www.coalashfacts.org, American Coal Ash Association Educational Foundation * |
"Fly Ash", http://www.epa.gov/osw/conserve/imr/ccps/flyash.htm, United States Environmantal Protection Agency * |
Bhat et al., "Machine Crushed Animal Bones as Partial Replacement of Coarse Aggregates in Lightweight Concrete", September 2012, ARPN Journal of Engineering and Applied Sciences, ARPN, pages 1202-1207 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9790703B1 (en) | 2016-08-16 | 2017-10-17 | Go Team CCR LLC | Methods of utilizing coal combustion residuals and structures constructed using such coal combustion residuals |
US9988317B2 (en) | 2016-08-16 | 2018-06-05 | Go Team CCR LLC | Structures constructed using coal combustion materials |
US10301223B2 (en) | 2016-08-16 | 2019-05-28 | Go Team CCR LLC | Beneficial use structures |
ES2715615A1 (en) * | 2017-12-05 | 2019-06-05 | Sitja Gratacos Angel | PIECE, PROCEDURE FOR YOUR TRAINING AND USES OF THE SAME (Machine-translation by Google Translate, not legally binding) |
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