Sulfate attack and embedded steel corrosion resistances of volcanic-aggregate concrete with fly ash and silica fume

Abstract

Construction materials are increasingly on high demand in the developing world. The construction industry has a challenge of discovering, new alternative construction materials to conventional materials which are locally available materials in environmentally friendly manner. The experimental tests are conducted on volcanic concrete system to analyze its properties especially corrosion resistance potential for its applicability in construction. The major aim is to investigate its suitability and corrosion resistance potential especially when used in construction of structures with embedded steel. The test results of the material show that volcanic concrete system with 30% fly ash and 10% silica fume cementing materials is an alternative green construction material. Permeability properties are reduced by 8% and 24% with 30% fly ash and 10% silica fume respectively. Tests also indicate that Compressive strength, Corrosion potential and polarization resistance in volcanic concrete system with supplementing cement materials has more potential to resist sulfate attack when compared with conventional volcanic concrete systems. The supplementary cementing materials (SCM) reduce the pore system and hence decrease the ingress of corrosive ions an water in concrete. Corrosive ions, moisture and air would initiate corrosion to the embedded steel in concrete leading to reduced service life such structures.
 Key word: Supplementary Cementing Materials, Sulfate attack, volcanic concrete system, Granite powder, river sand, Corrosion of embedded steel

Bond of Seawater Scoria Aggregate Concrete to Stainless Reinforcement

“…The test results indicated that SAC failed prematurely after the peak point under the similar strength condition, owing to the brittleness of the SCA. Furthermore, volcanic scoria aggregate could also improve the durability (e.g., corrosion resistance) of concrete based on the corrosion potential and linear polarization resistance tests [13,14], and the shock absorption performance of lightweight concrete adopting SCA was higher compared to OC through the impact test [14]. However, the ductility and deformability of concrete adopting SCA were inferior to those of OC due to the lightweight aggregates.…”