Study On The Polymer Modified Cementitious Sand-fixing Material

The quick expansion of the desert area and the frequent occurrence of the sandstorm have resulted in the environment deterioration and the great loss in economy, even cause the social problem of some regions. Desertification becomes the focus of the extensive attention in the world. It is necessary to excogitate the new sand-fixing material to stop increasingly rampant desertification. It can promote big development in western region in our country, improve ecosystem environment and accelerate development of social economy under the new situation.This paper brings up a new design principle that some kinds of polymers can modify cement mortar to prepare high w/c ratio and high c/s ratio polymer modified cementitious sand-fixing material. First the polymers are chosen. The act mechanism of the cationic emulsified asphalt and the polyacrylate super-water-absorbent resin on the cement mortar is analyzed in the dry environment, and the micro-structure of the polymer .modified cementitious sand-fixing material is analyzed through XRD, SEM. The results show the cationic emulsified asphalt and the polyacrylate super- water-absorbent resin can prevent water from evaporating and promote hydration of the cement. They can forms the net in the cement mortar, because the can form special chemical bond with cement hydrate which can improve the physical structure of the material, and increase the strength of the cement mortar remarkably and decrease the brittleness of the cement mortar effectively. The optimal ratio of the cement, sand, emulsified asphalt and superabsorbent water resin are found through optimal design and experiments. The durability of the sand-fixing material has been studied in the laboratory systematically and comprehensively. The results show this sand-fixing material has excellent aging-resistant, frost-resistant, good ability of countering wind erosion and water erosion.