Preparation and performance evaluation of new retarder for concrete
In order to effectively extend the setting time of concrete and improve the long-distance pumping performance of concrete,a new type of retarder GRE-1 suitable for concrete was prepared by free radical polymerization with vinyl polyoxyethylene ether TPEG,methacrylic acid MAA and acrylic acid phosphate monomer FM-1 as the main raw materials,and its comprehensive performance was evaluated.The test results show that the new retarder GRE-1 can effectively improve the fluidity of cement slurry and prolong the setting time of cement slurry.When its mass concentration is 0.5％,the fluidity of cement slurry can be greatly improved,and the initial setting time and final setting time of cement slurry can be extended by more than one time;GRE-1 can also combine with cations in cement slurry to effectively reduce the concentration of cations in filtrate;The incorporation of GRE-1 can greatly improve the early compressive strength and flexural strength of cement mortar specimens,and improve their mechanical properties;The application effect of GRE-1 in concrete is obviously better than that of common commercial retarders HT-1 and HP-1.The research results show that the new retarder GRE-1 can effectively improve the working performance of concrete and meet the needs of concrete long-distance pumping.
万方数据
维普
