Waste concrete is used to replace blast-furnace slag powder (BFSP) to replace mortar experiments in different ratio. Through the 7 days and 28 days of unconfined compressive strength test,the effects of different replace ratios on BFSP activity were compared. Experiments showed that the effect on the early strength of BFSP is smal ,but there is some adverse effect on the later strength of BFSP. By control ing appropriate ratio of waste concrete recycled powder, the quality of BFSP can be guaranteed effectively,and its impact on the water absorption of BFSP is not obvious. Then mixed grinding performance test was made when waste concrete fine aggregate mixed ratio was 10%. The grinding time was 20 min,35 min,50 min,65 min and 80 min respectively. Through compared the specific surface area of each time segment material, its grind-ability was found out. Experiments showed that the waste concrete fine aggregate is more easily to grind, but there is agglomeration phenomenon when grind waste concrete fine aggregate only. However,mixed grinding can improve grinding efficiency,reduce grinding time,and save grinding energy consumption. There is certainly helpful effect on grinding the blast furnace slag.%用建筑垃圾废弃混凝土再生粉体按一定比例部分替代高炉矿渣粉，设定不同替代比例进行胶砂实验，通过测试7 d和28 d抗压强度，对比不同替代比例对高炉矿渣粉活性的影响，实验表明废弃混凝土粉体部分替代高炉矿渣粉对早期强度影响很小，但对其后期强度有一定影响，通过控制适当比例，可有效保证产品质量，且不会对产品的吸水率造成明显影响。同时，选定废弃混凝土细集料掺混比例为10%进行两种物料的混磨性能试验。粉磨时间分别设定20 min，35 min，50 min，65 min和80 min。通过对比各时间段物料的比表面积来分析其易磨性，实验表明废弃混凝土细集料比高炉矿渣的易磨性好，但单磨时会出现团聚现象；通过混掺共磨可以提高高炉矿渣粉磨效率、降低粉磨时间、节约粉磨能耗，具有一定的助磨作用。
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