| 摘要 |
Disclose is a method for treating the surface of a hydratable cementitious composition, comprising: providing a hydratable cementitious composition having a surface to be etched, said hydratable cementitious composition comprising a hydratable cement binder comprising Portland cement, masonry cement, or mortar cement, and water; said hydratable cementitious composition further comprising an aggregate selected from the group consisting of sand, crushed gravel, and stone; applying a coating composition on to a surface of said cementitious composition, said coating composition comprising at least one cement set retarding active component (such as a sugar selected from the group consisting of sucrose, roferose, dextrose, maltose, lactose, xylose, fructose, mannose, and glucose) dispersed in a vegetable oil or derivative thereof, an animal oil or derivative thereof, or a mixture of said oils or derivatives thereof; and washing away a portion of said surface of said cementitious composition coated with said coating composition using a pressure-washer or hose, thereby revealing an etched portion in said cementitious composition comprising said aggregate.
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