Method for preparing recycled aggregate by using construction waste

According to the method for preparing the recycled aggregate by using the construction waste, moisture in the construction waste is removed and a gel component structure in the construction waste is changed by a segmented heating method, so that crushing and washing processes of the dried construction waste are facilitated. Gel components and metal ions in the construction waste are removed through acid soaking and water washing processes, the washed aggregate is soaked with a mixed solution of silicon dioxide and sodium silicate, the performance of the recycled aggregate is improved, the water absorption rate of the recycled aggregate prepared through the method is 1.8%, and the crushing index is 7.5%. 本发明提供一种利用建筑废弃物制备再生骨料的方法，通过分段升温的方法去除建筑废弃物中的水分和改变建筑废弃物中的凝胶组分结构，有利于烘干后的建筑废弃物粉碎和水洗工艺。通过酸浸泡、水洗工艺去除建筑废弃物中的凝胶组分和金属离子，水洗后的骨料采用二氧化硅和硅酸钠混合液浸泡，提高再生骨料性能，本发明制得再生骨料吸水率为1.8％，压碎指标为7.5％。