Cement Board

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.

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)