摘要
针对低品质粉煤灰存在的水化活性低、流动性差等问题,在粉磨改性的基础上采用粉磨+流化床气相沉积的处理方法,对低品质粉煤灰进行复合改性,在减水剂用量相同时,复合改性粉煤灰表现出明显的减水效果,采用复合改性的低品质粉煤灰制备的混凝土,工作性得到明显改善,28d龄期强度提高一个强度等级,每立方混凝土可节约成本5~6元,对充分利用劣质粉煤灰具有实际指导作用。
In view of the problems of fly ash with low quality,such as lower hydration activity and poorer liquidity,a novel method （grinding＋fluidized bed vapor deposition） was put forward to modify fly ash. The composite modified fly ash can exhibit more effect of water reducing than unmodified fly ash, on the condition of equal addition of water reducer. The concrete that was made from modified fly ash has dramatically improved the work ＇ability, and its strength at 28d age increased one strength grade. It can save costs of 5 to 6 yuan per cubic meter of concrete, it played a practical guiding role to the low-quality fly ash.
出处
《粉煤灰综合利用》
CAS
2017年第3期16-18,共3页
Fly Ash Comprehensive Utilization
基金
河北省重点科技项目(16273805D)
关键词
粉煤灰
复合改性
混凝土
fly ash
composite modification
concrete
