高活性稻壳灰的制备及其对水泥性能的影响

通过研究煅烧制度对稻壳灰火山灰活性的影响 ,提出了一种有效制备高活性稻壳灰的方法。采用这种方法 ,可以稳定地实现半工业化生产 Si O2 含量大于 90 %且主要为非晶态的白色多孔状稻壳灰 ,其火山灰活性很高。在稻壳灰的粉磨过程中 ,必须加入助磨剂 ,否则细颗粒的二次团聚会使稻壳灰的活性降低。在水泥中掺入不同比例的稻壳灰 ,可以大幅度地提高水泥胶砂强度 ,而且水胶比越大 ,强度提高率越大。

Preparation of Highly Reactive Rice Husk Ash and Its Effect on Cement Properties

This study shows that the pozzolanic activity of rice husk ash(RHA)is greatly influenced by the manners in which it is burnt and ground. Based on the results of this study the authors put forward a method for producing highly active RHA. By this method white and porous RHA containing >90% non crystalline SiO 2 and with high pozzolanic activity can be produced stably in a semi industrial furnace. In order to get active ground RHA, grinding agent should be used in its grinding process, otherwise the secondary agglomeration occurred among the finely ground RHA particles may decrease the pozzolanic activity of RHA.With different RHA replacement of cement, the strength of cement mortar is greatly increased, and the larger the water to cement and RHA ratio, the greater the increment in mortar strength.