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Study of fine mortar powder from different waste sources for recycled concrete production

Abstract:

Searching new options to exploit crushing concretewaste or recycled mortar powder fines (RMF) has lead the development of new processes for recycling concrete. By heat treatments allow reincorporates concrete waste material into new concrete manufacturing process. The current research determines chemical composition of burned recycled mortar powder fines (BRMF) obtained from different sources. Also, this experimental research, analyzes how BRMF in addition to cement, affects to compressive strength of composite. Using a 30% BRMF ratio for replacing Ordinary Portland Cement (OPC), the study determined that the direct use of this material, decreases compressive strength of composite, reaching 21-54% of normal strength in most specimens. Based in Ca/Si ratio study, is observed how compressive strength is related to Ca/Si balance of the mixture, where the specimens with Ca/Si higher radio reach at 72% of normal compressive strength, compared to mixtures using only cement. Thus, experimental study noticed that the main criterion for assessing the use of RMF is the concentration of CaO, there are no significant differences between RFM from concrete or mortar prepared and put in work, unlike waste or special premixed mortars.