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This study investigates the effect of the diethyl carbonate as a carbonation accelerator on the carbonation of lime mortars. Two types of lime mortars were prepared, one using lime putty and standard sand and the other using lime putty, dust and fragments of ceramic and standard sand. After a curing time of two weeks, the accelerator product, diethyl carbonate in a solution of ethanol and water, was sprayed on half of the mortars of each type. The differences in the carbonation performance were analyzed at 28, 90, 120 and 180 days using different analytical methods. Apart from the mineralogical and petrographic characterization, the physical, mechanical and hydric properties of the samples were determined. Mechanical tests were conducted only at 90, 120 and 180 days, because at 28 days the lime mortars were considered still too soft. The mortar samples with the accelerator had steadier carbonation …