Two-stage mixing approach(TSMA) versus Normal mixing approach(NMA) for concrete in terms of Compressive strength and Carbonation depth.

One of the major challenges of our present society is the protection of environment. Some of the important elements in this respect are the reduction of the consumption of energy and natural raw materials and consumption of waste materials. These topics are getting considerable attention under sustainable development nowadays. The use of recycled aggregates from construction and demolition wastes is showing prospective application in construction as alternative to primary (natural) aggregates. It conserves natural resources and reduces the space required for the landfill disposal[9]. A new concrete mixing method, that is the two-stage mixing approach (TSMA), was developed to improve the quality of RA concrete (RAC) by splitting the mixing process into two parts. The current paper describes the variation of compressive strength and carbonation depth by experimental analysis involving the modified mixing method with some amendments to the two-stage mixing approach by proportioning ingredients with the percentage of recycled coarse aggregates (RCA) and fly ash. Based on experimental works and results, improvements in strength to RAC were achieved with TSMA. The current paper describes the variation of compressive strength and carbonation depth by analyzing experimentally involving the modified mixing method with some amendments to the two-stage mixing approach by proportioning ingredients with the percentage of recycled coarse aggregates (RCA) and fly ash.