钢筋混凝土英文是reinforced concrete。
词典：
reinforced concrete; RC; ferroconcrete
例句：
It was only thirty years ago that the building industry felt confident enough to erect office blocks of steel and?reinforced concrete?that had more than a dozen floors.
建筑行业是从30年前才开始有信心建造超过12层楼高的钢筋混凝土结构的办公大楼。