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Method for recycling fine aggregate in waste concrete
The invention relates to a method for recycling fine aggregate in waste concrete, and belongs to the technical field of resource recycling. Calcium in cement components on the surface of fine aggregate in waste concrete is leached mainly through a calcium remover solution, so that C-S-H bonds of cement gel and lime components generated by hydration are destroyed, the cement components are stripped from the surface of the aggregate and converted into soluble calcium salt and mineral powder, and high-quality fine aggregate is obtained after wet screening and washing; and meanwhile, admixture components and mineral powder which can be used for concrete production are obtained, so that cyclic and comprehensive recycling of the waste concrete is achieved.
本发明涉及一种回收废旧混凝土中细骨料的方法，属于资源循环利用技术领域。本发明主要通过一种除钙剂溶液浸出废旧混凝土中细骨料表面水泥组分中的钙，从而破坏水泥凝胶的C‑S‑H键及水化产生的石灰组分，使水泥组分从骨料表面剥离并转化为可溶性的钙盐和矿粉，经湿式筛分和洗涤后得到高品质的细骨料，同时获得可用于混凝土生产用的外加剂组分及矿粉，实现废旧混凝土的循环综合回收利用。
Method for recycling fine aggregate in waste concrete
The invention relates to a method for recycling fine aggregate in waste concrete, and belongs to the technical field of resource recycling. Calcium in cement components on the surface of fine aggregate in waste concrete is leached mainly through a calcium remover solution, so that C-S-H bonds of cement gel and lime components generated by hydration are destroyed, the cement components are stripped from the surface of the aggregate and converted into soluble calcium salt and mineral powder, and high-quality fine aggregate is obtained after wet screening and washing; and meanwhile, admixture components and mineral powder which can be used for concrete production are obtained, so that cyclic and comprehensive recycling of the waste concrete is achieved.
本发明涉及一种回收废旧混凝土中细骨料的方法，属于资源循环利用技术领域。本发明主要通过一种除钙剂溶液浸出废旧混凝土中细骨料表面水泥组分中的钙，从而破坏水泥凝胶的C‑S‑H键及水化产生的石灰组分，使水泥组分从骨料表面剥离并转化为可溶性的钙盐和矿粉，经湿式筛分和洗涤后得到高品质的细骨料，同时获得可用于混凝土生产用的外加剂组分及矿粉，实现废旧混凝土的循环综合回收利用。
Method for recycling fine aggregate in waste concrete
一种回收废旧混凝土中细骨料的方法
CHEN YA (author) / FENG JIANBANG (author) / WANG LONGJUN (author) / LIU YONG (author) / LIAN PING (author) / SHI XICHANG (author)
2021-04-13
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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