关键词: 高岭土尾砂, 化学活性激发剂, 混凝土, 活性掺合料

Abstract: Kaolin tailing is a kind of solid waste generated from mineral separation. The concrete admixture prepared with kaolin tailing through mechanical milling and the addition of chemical activator was primary researched. The results show that the activity of kaolin tailing can be increased dramatically through adding the chemical activator, where the activator must contain CaO or Ca(OH)2, and can include Na2SO4 or CaSO4, selectively. The 28-day compressive strength ratio of concretes reaches up to 97% after 20%~30% reactive kaolin tailing replace 10%~20% cement, and then the workability of concrete will not be affected. This technique not only reduces the amount of cement and engineering cost, but also changs waste into valuables and prevents environmental pollution with significant economic and social benefits.

Key words: Kaolin tailing, Chemical activator, Concrete, Reactive admixture