following

I follow

If it is the mechanical properties of soil both lateritic of black cotton soil (Tropical black clay) the optimum blend is 6% RHA and 6% Cement. which is applicable to other pozollanic agricultural materials

Interesting question

Regards

Dear Professor Salah

I agree with Professor Hassnen Mosa Jafer, and It is about 15% - 25% from the total binder.

All the best,

Mostafa

I think it is 15%-25% as mentioned by Hassnen Mosa Jafer.

All the best,

Mostafa

Good and interesting discussion

Good and interesting discussion

I think if the RHA you will use was a rich in silica (around 90%) you can replace 5 to 6% of cement otherwise use 10 to 15% if the silica content less than 90%.

Based on the literature, the rich RHA will behave similarly as silica fume.

I'm glad to see so many experts in the field of the application of the RHA. I am currently engaged in the development of concretes using RHA. Does anyone want to join my research?

Valuable and useful comments.