Use of Hybrid Rice Husk Ash/Fly Ash as Sustainable Materials for Concrete in a Marine Environment

This paper presents the comparison of shrinkage and corrosion characteristics of optimized Hybrid Rice Husk Ash (RHA)/Fly Ash (FA)-modified Concrete, with those of normal concrete in the marine environment. Uses of both FA and RHA have numerous environmental benefits. The restrained shrinkage experiments are being performed following the ASTM C1581-04 “Standard Test Method for Determining Age at Cracking and Induced Tensile Stress Characteristics of Mortar and Concrete under Restrained Shrinkage”. This test consists in placing concrete around a 305 mm diameter steel ring, and measuring the strain of the ring, until the concrete cracks. The time to cracking of the concrete is compared for the different mix combinations to determine shrinkage performance characteristics. The corrosion testing of reinforced columns is being performed in a simulated tidal cycle Marine Environment. The corrosion performance of the specimens is monitored using Potentiostat equipment, in order to provide a comparison of corrosion behavior.