肯尼亚天然火山灰碱含量的测定研究

Study on Determination of Alkali Content of Natural Pozzolan in Kenya

随着掺合料应用的日益普遍,掺量越来越大,其引入的碱对混凝土多方面性能的影响不可忽视。目前对此研究较少,标准也无相关规定,致使如天然火山灰等一些总碱量较高的地方性掺合料,在工程应用时出现障碍。为此,结合实际工程项目,选取肯尼亚当地两种典型的火山灰材料,采用在饱和石灰水中煮沸回流的方法快速、准确地测定出其有效碱含量。

As the applications of admixture are increasingly widespread and the dosage is bigger and bigger, the introduction of alkali which has influence on the various performance of concrete cannot be ignored. However, due to the study about alkali of admixture is less until now, and the standard also do not have relevant provision, some local admixture which has a high total alkali content such as natural pozzolan are impeded in the application. Combining with the actual project, we select two local typical natural pozzolan in Kenya for experiment and rapidly and accurately determine the available alkali content with the method of boiling reflux in saturated lime water.