稻壳灰与不同减水剂适应性研究

Study on the Adaptability of Rice Husk Ash in Different Water Reducers

研究稻壳灰在与不同减水剂的复合作用过程中流动性、流动性经时损失、强度等方面的变化规律,分析稻壳灰与减水剂的适应性,探索利用外加剂调控水泥-稻壳灰复合胶凝材料的可行性,完善稻壳灰与其他原材料的匹配关系。结果表明:稻壳灰对高分散聚羧酸减水剂的应用性能影响最大,严重加剧流动性经时损失;保坍型外加剂能够有效改善稻壳灰浆体流动性经时损失严重的问题,但是会严重减缓水泥水化进程;稻壳灰对萘系减水剂的作用规律影响不大,与纯水泥体系相近。

The influence of rice husk ash（ RHA） on flowability,flowability loss with time and strength were studied in the composite with different water reducers. The adaptability of rice husk ash and water reducers are analyzed to explore the matching relationships of rice husk ash with other raw materials. The results showed that the rice husk ash had the biggest impact on application performance of polycarboxylic acid admixture with high dispersing,and aggravated by the flowability loss; polycarboxylic acid admixture with low slump can effectively improve the rice husk ash produced by loss during severe liquidity problems,but can seriously slow cement hydration process. Effect of the rice husk ash on naphthalene based water reducers was relatively stable which is closed to the pure cement system.