Performance of recycled aggregate concrete with rice husk ash as cement binder. (April 2020)

• Record Type: Journal Article
• Authors: Rattanachu, Pokpong; Toolkasikorn, Prajak; Tangchirapat, Weerachart; Chindaprasirt, Prinya; Jaturapitakkul, Chai
• Is Part Of: Cement & concrete composites. Volume 108(2020)
• Publication Date: 2020-04
• Subjects: Rice husk ash -- Recycled aggregate -- Compressive strength -- Steel corrosion -- Chloride penetration; Composite-reinforced concrete -- Periodicals; Concrete -- Periodicals; Composite materials -- Periodicals; Composites de ciment -- Périodiques; Béton -- Périodiques; Composites -- Périodiques; Béton léger -- Périodiques; Cement composites; Composite materials; Composite-reinforced concrete; Concrete; Lightweight concrete; Periodicals; Electronic journals; 620.135
• DOI: 10.1016/j.cemconcomp.2020.103533
• Languages: English
• ISSNs: 0958-9465

Abstract

Abstract: This research aims to utilize rice husk ash as a cementitious materials in recycled aggregate concrete (RAC). Rice husk ash was ground until the particles remained on a No. 325 sieve were 4.6%wt. Then, the ash was used to partially replace cement at 20 to 50%wt of binder to cast concrete. The compressive strength, steel corrosion, and chloride penetration depth by the impressed voltage method of RAC were examined. The results revealed that the replacement of 20% of ordinary Portland cement (OPC) by ground rice husk ash (GRHA) enhances the compressive strength of the RAC to be greater than the RAC without GRHA at 60 days. Concrete with GRHA at 20 to 50%wt of binder significantly improved the steel corrosion and chloride resistance of the RAC. The utilization of GRHA at 50% to replace OPC gave the highest chloride penetration resistance and produced the lowest steel corrosion of the RAC. Although, the RAC with GRHA had less compressive strength than CT concrete, the concrete provided a positive effect of increasing the resistance of chloride penetration and lowering steel corrosion.