Experimental Investigation on Durability Properties of Concrete using Hybrid material (Nano Rice Husk Ash and Nano Fly Ash) as a partial replacement of OPC
Keywords:
Durability, Hybrid material, Fly ash, Rice husk ash, Compressive strength, Chloride permeability, Acid attack, Alkaline, Sulphate.Abstract
Durability is defined as the capability of concrete to resist weathering action, chemical attack and abrasion while
maintaining its desired engineering properties. It normally refers to the duration or life span of trouble-free performance.
Different concretes require different degrees of durability depending on the exposure environment and properties desired.
Ordinary Portland Cement (OPC) is one of the main ingredients used in the production of concrete. Large scale production
of cement is causing environmental problems on one hand and depletion of natural resources on other hand. This threat to
ecology has led researchers to use industrial by products as supplementary cementitious material in making concrete such
as Fly ash and rice Husk ash due to its huge production and also they causes environmental pollution.
In this study, concrete of grade M25 with partial replacement of cement by nano rice husk ash (5, 10 and 15%) and
nano fly ash (20, 30, 40 and 50%) and their combinations are prepared at a constant water/binder ratio of 0.5. A detailed
experimental study on Compressive strength and Durability tests including Chloride permeability, Acid attack, Alkaline
attack and Sulphate attack at age of 28, 60 and 90 days are investigated experimentally and compared with Conventional
concrete and combination of 20% nano FA and 5% Nano RHA proved to be optimum.
