Fly ash as a sand replacement material in concrete - A study

摘要

Dear Sir, This has reference to the paper titled 'Fly ash as a sand replacement material in concrete - A study' by N.P. Rajamane and Ambily P.S., published in The Indian Concrete Journal (July 2013, Vol. 87, No. 7, pp. 11-17). In this paper, the authors have made an attempt to study the performance of fly ash as a sand replacing material (SRM) in concrete. They have discussed the many advantages of such concretes including the durability characteristics. Their data analysis suggests that this concrete has a better strength to weight ratio and strength to energy ratio and hence it is a more eco-friendly and less energy intensive material. The paper is well written and lots of experimental results are presented which according to the discusser will help other researchers working in this area. However, this discusser would like to clarify a few points on the use of fly ash as sand replacing material and seek some clarification about the results.