摘要
为了提高废弃混凝土再生资源的利用效率,提出实现各组分高效再生利用技术路线和方法。将分离出来的水泥石组分经过低温煅烧处理,制备得到可再次水化并形成胶凝能力的再生胶凝材料。利用X射线衍射、扫描电子显微镜、力学测试等手段对其矿物组成、水化硬化过程等进行了研究。实验结果表明:不同煅烧温度下制备得到的再生胶凝材料矿物组成及其结构不同,使其水化活性存在差异。其中在650℃煅烧得到的再生胶凝材料以不完全结晶的β-C2S矿物相为主要成分,具有优良的水化胶凝能力。
To improve the efficiency of waste concrete reutilization, a high efficiency method for separating and recycling the components of waste concrete was proposed. Regenerated binding materials （RBMs） were prepared by calcining the separated hardened cement powder at low temperatures. X-ray diffraction, scanning electron microscopy, compressive strength testing and other methods were used to investigate the mineral phase compositions and the hydration characteristics of RBM. The results show that the RBMs prepared at different temperatures have various compositions and structures, which is the essential reason for the change of their hydration reactivity. RBM prepared at 650 ℃has a main mineral phase of β-C2S, and its hydration reactivity is excellent.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2007年第5期593-599,共7页
Journal of The Chinese Ceramic Society
关键词
废弃混凝土
再生资源
回收利用
再生胶凝材料
waste concrete
renewable resource
reutilization
regenerated binding materials
