Patent ID: 6871466

Claim:
A building fender structure comprising a first board and a second board matching the first board, both the first board and the second board having a cement body made of foaming cement, reinforcement ribs embedded in the cement body, and a cement surface layer over an outer surface of the cement body of the first board and the second board; wherein a shaped steel frame is mechanically tied to the reinforcement ribs of the first board and embedded in the cement body of the first board with the steel frame partially exposed; the second board has expansion joints and fixation holes in its cement body and is connected to the shaped steel frame through the expansion joints; and wherein the foaming cement is formed from a mixture containing 10-70% dicalcium silicate, 10-70% anhydrous calcium sulphoaluminate, 10-70% sulphate dihydrate, 0-90% tricalcium silicate and 10-50% water, 1-10% foaming agent and 1-10% modifying additives.