In order to achieve efficient resource utilization of stone powder in Pingliang area and explore the influence of different fine-ness of limestone powder on the properties of cementitious materials.It grinds the mechanism sand and stone powder in Pingliang area to obtain different fineness of limestone powder.Different fineness of limestone powder is replaced with cement in different proportions and masses,and the effects of stone powder particle size,stone powder dosage,etc.on the performance of mortar are compared and studied.Based on carbon emission calculation standards,the carbon emission reduction benefits of using stone powder to prepare concrete are cal-culated and analyzed.The results show that replacing cement with stone powder can shorten the setting time of the mortar.As the amount of stone powder increases,the flowability of the mortar gradually decreases and the compressive strength gradually decreases.When the spe-cific surface area of stone powder is 1.5 times that of cement,the flowability of the mortar is better,and the fineness of stone powder is beneficial for the increase of the compressive strength of the mortar.Replacing cement with limestone powder can effectively reduce car-bon emissions from concrete,and the carbon reduction percentage of concrete with different strength grades is roughly equal to its dosage.
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