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硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (6): 2198-2205.

• 资源综合利用 • 上一篇    下一篇

废弃混凝土再生砂的吸附特性研究

程欢1,2, 李化建1,3, 黄法礼1,3, 王振1,3, 易忠来1,3   

  1. 1.中国铁道科学研究院集团有限公司铁道建筑研究所,北京 100081;
    2.中国铁道科学研究院研究生部,北京 100081;
    3.高速铁路轨道系统全国重点实验室,北京 100081
  • 收稿日期:2023-10-17 修订日期:2024-01-19 出版日期:2024-06-15 发布日期:2024-06-18
  • 通信作者: 李化建,博士,研究员。E-mail:chinasailor@163.com
  • 作者简介:程 欢(1998—),男,硕士研究生。主要从事铁路工程材料的研究。E-mail:15222941916@163.com
  • 基金资助:
    国家重点研发计划(2020YFC1909900);国家自然科学基金(52108260);中国国家铁路集团有限公司科技研究开发计划(L2022G009)

Adsorption Characteristics of Recycled Sand Derived from Waste Concrete

CHENG Huan1,2, LI Huajian1,3, HUANG Fali1,3, WANG Zhen1,3, YI Zhonglai1,3   

  1. 1. Railway Engineering Research Institute, China Academy of Railway Science Corporation Limited, Beijing 100081, China;
    2. Postgraduate Department, China Academy of Railway Sciences, Beijing 100081, China;
    3. National Key Laboratory of High Speed Railway Track System, Beijing 100081, China
  • Received:2023-10-17 Revised:2024-01-19 Online:2024-06-15 Published:2024-06-18

摘要: 为解决再生砂高吸附性导致的混凝土工作性能快速损失这一问题,以C20~C60六种废弃混凝土再生砂为对象,采用压汞法和低温液氮吸附法测试再生砂的孔结构特征,利用X射线衍射(XRD)测试再生砂的物相组成,探究再生砂对水、亚甲蓝以及减水剂的吸附规律。结果表明:再生砂吸水率随废弃混凝土料源强度等级增加而降低,与孔结构有一定的相关性;再生砂对亚甲蓝的吸附性随黏土矿物含量降低而降低,与孔结构相关性不明显;再生砂对聚羧酸系减水剂的吸附性受孔结构和黏土矿物共同作用,但主要取决于黏土矿物的含量。

关键词: 废弃混凝土, 再生砂, 吸附性, 孔结构, 吸水率

Abstract: In order to solve the problem of rapid loss of concrete workability caused by high adsorption of recycled sand, six kinds of recycled sands of C20~C60 were used as objects. The pore structure characteristics of recycled sand were tested by mercury intrusion and low-temperature liquid nitrogen adsorption methods, and the physical composition of recycled sand was tested by X-ray diffraction (XRD). The adsorption law of recycled sand on water, methylene blue, and superplasticizer was explored. The results show that the water absorption rate of recycled sand decreases with the increase of strength grade of waste concrete materials, which is closely related to pore structure. The adsorption of recycled sand on methylene blue decreases with the decrease of clay mineral content, and there is no significant correlation with pore structure. The adsorption of recycled sand on superplasticizer is affected by both pore structure and clay mineral, but mainly depends on clay mineral content.

Key words: waste concrete, recycled sand, adsorption, pore structure, water absorption

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