Properties of treated recycled aggregates and its influence on concrete strength characteristics. (15th May 2016)

• Record Type: Journal Article
• Authors: Saravanakumar, P.; Abhiram, K.; Manoj, B.
• Is Part Of: Construction & building materials. Volume 111(2016)
• Page Start: 611
• Page End: 617
• Publication Date: 2016-05-15
• Subjects: NA natural aggregate -- NAC natural aggregate concrete -- RA recycled aggregate -- RAC recycled aggregate concrete -- RAH2SO4 H2SO4 treated recycled aggregate -- RAHNO3 HNO3 treated recycled aggregate -- RAHCl HCl treated recycled aggregate -- RACHCl&SF HCl and silica fume treated recycled aggregate -- RACH2SO4 H2SO4 treated recycled aggregate concrete -- RACHNO3 HNO3treated recycled aggregate concrete -- RACHCl HCl treated recycled aggregate concrete; Recycled aggregate -- Presoaking surface treatment method -- Silica fume impregnating method -- Recycled aggregate concrete -- Compressive strength; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2016.02.064
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: The surface treatment by presoaking the recycled aggregates in acids significantly improves the properties of RA. Acid treated and silica fume impregnated recycled aggregate gave better concrete strength in the later age. The strength development of recycled aggregate concrete with treated RA was better than untreated RA. Abstract: Utilization of recycled aggregate (RA) from crushed concrete wastes as alternative to natural aggregate in construction industry solve the construction and demolition waste (C&DW) disposal problems and reduces the gap between the demand and supply. The adhered mortar affects the properties of RA to significant level. This paper has studied the characteristics of recycled aggregates retrieved from crushed old concrete obtained from demolished structures, and five different presoaking surface treatment method and silica fume impregnating method to improve the properties of the recycled aggregates and its effect on recycled aggregate concrete (RAC). From experimental results it was observed that after treatment there was a significant improvement in the physical and mechanical properties of RA because of adhered mortar removal. The compressive strength was also significantly improved by using treated RA in RAC. Hence it is concluded that these treatment methods can be effectively used for the recycled aggregates to improve its characteristics.