In view of the lack of traditional mineral admixtures in Kenya,the activity of natural pozzolanic ash as mineral admixtures was studied through the analysis of pH value,SEM and XRD of admixtures.The results show that the change in pH value of natural volcanic ash slurry proves that natural volcanic ash has certain volcanic ash activity.Natural volcanic ash such as tuff and volcanic ash have lower activity in the early stages.Over time,both types of volcanic ash effectively enhance the compactness of cement through volcanic ash reaction and filling;2# volcanic ash,also known as volcanic slag,has a higher activity,and over time,the activity of volcanic ash increases and promotes the cement hydration process,which can more effectively improve the compactness and durability of concrete.
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