Patent ID: 7040066

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 positioned between the first board and the second board with an inner surface of the first board facing an inner surface of the second board; the first board and the second board have expansion joints and fixation holes in their cement body and are 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.