• R. Thirumalai

During the past few decades Common River sand has become expensive due to excessive cost of transport from natural sources. Large scale depletions of these sources have led to many environmental impacts. In order to overcome these impacts an alternative has to be found in order to replace sand. The manufactured sand (M-sand) has found to be economical alternative to the river sand. M-sand is obtained as a crushing of granite stones in required grading to be used for construction purposes as a replacement for river sand. M-sand has been used in large scale in highways as surface finishing materials and also used in the manufacture of hollow blocks and in light weight concrete prefabricated elements. In this, investigations were carried out to study the flexural strength and to find the strength using NDT of concrete slab using M-sand as fine aggregate instead of river sand and RAC (Recycled aggregate concrete) as coarse aggregate. And compare the results obtained from both the conventional RCC and RAC. The present investigations mainly focused on the M-sand properties and the strength obtained from both the river sand and m-sand and recycled coarse aggregates. In order to solve the problem of the granite powder disposal from the industries and also to solve the raw materials shortage problem for concrete, studies are being made to utilize the M-sand in the manufacture of varieties of building and ceramics products. This investigation is also based on the comparison of the flexural strength and to find strength using NDT achieved by slabs in normal sand, M-sand and crushed recycled aggregates.

NDT- Non-Destructive Testing, flexural strength, river sand, M-sand, Recycled aggregate concrete (RAC).

"An Experimental Investigation on Roof Panels Made of Composites", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 2, page no.13-17, February-2018, Available :http://www.jetir.org/papers/JETIR18MG003.pdf

"An Experimental Investigation on Roof Panels Made of Composites", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 2, page no. pp13-17, February-2018, Available at : http://www.jetir.org/papers/JETIR18MG003.pdf