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为解决建筑垃圾成分复杂、粉料造成二次污染的问题,根据废弃混凝土粉料具有一定活性且多孔的特点,研究了废弃混凝土粉料掺量对陶瓷面砖粘结剂工作性和力学性能的影响规律。结果表明:多孔的建筑垃圾细粉料会导致瓷砖粘结剂砂浆的需水量增加、保水能力增强、凝结时间缩短,废弃混凝土微粉的优化掺量区间为外掺10%。采用XRD、SEM等测试技术从微观上揭示建筑垃圾微粉的掺入对力学性能的影响机理是:在低掺量条件下,多孔的建筑垃圾微粉在拌合初期孔洞吸水,形成局部低水胶比区,同时在水化过程中释放水分,促进了粉料周围水泥水化;高掺量时建筑垃圾微粉活性显著低于水泥的活性,降低粘结剂砂浆的总体强度。
In order to solve the problem of complex construction waste and secondary pollution caused by powder, the influence of the content of waste concrete powder on the workability and mechanical properties of ceramic tile adhesive was studied according to the active and porous characteristics of waste concrete powder. law. The results show that the porous construction waste powder can lead to the increase of the water requirement of tile adhesive mortar, the increase of water retention capacity and the shortening of the setting time. The optimal dosage range of waste concrete powder is 10% externally doped. Using XRD, SEM and other test techniques microscopically reveals the incorporation of construction waste micropowder on the mechanical properties of the mechanism is: under low dosage conditions, the porous construction waste micropowder in the early mixing hole water absorption, the formation of local low water glue ratio Area, and at the same time release moisture in the hydration process to promote the hydration of cement around the powder; at a high dosage, the activity of construction waste micropowder is significantly lower than the activity of cement, reducing the overall strength of the binder mortar.