... concrete, asphalt, and block, using in the slope surface protection of roadway, railway, river-way, dyke, and ... of the wind and rain (3)Form compound protection layer with the vegetable, standing the wash- ... of that of the concrete and stone pitching slope protection, and 1/8 of that of the ... wet masonry rock block slope protection. (5)Adopt polymer material and the ultravioresistant ...