广州化学2025，Vol.50Issue(4)：33-39,7.DOI:10.16560/j.cnki.gzhx.20250410
聚多巴胺/甲酸钙新型喷射混凝土速凝剂的制备及机理
Preparation and Mechanism of Polydopamine/Calcium Formate Accelerator for Shotcrete
李佳霖 1周珊珊 1黄月文 2王斌2
作者信息
- 1. 中国科学院广州化学研究所,广东 广州 510650||中国科学院大学,北京 100049
- 2. 中国科学院新型特种精细化学品工程实验室,广东 广州 510650||国科广化韶关新材料研究院,广东 韶关 512400||国科广化精细化工孵化器(南雄)有限公司,广东 南雄 512400
- 折叠
摘要
Abstract
This study prepared a novel polydopamine/calcium formate accelerator to achieve rapid setting of shotcrete.The infrared spectrum results show that the dopamine reacts with O2 to produce polydopamine via the oxidative self-polymerization.The results of scanning electron microscope shows that cylindrical ettringite dendrites grows on the surface of calcium hydroxide and ettringite at the 10 min of hydration.When the dosage is 0.075%,the initial setting time of cement paste is shortened from 118 min 45 s to 3 min 51 s.The final setting time is shortened from 212 min 45 s to 10 min 7 s.The 1 day and 28 days compressive strength of cement mortar can reach 7 MPa and 33.6 MPa respectively,which can meet the requirements of construction engineering.The mechanism analysis suggests that the ionization of calcium formate produces formate ions.These ions are adsorbed to the surface of crystals of calcium hydroxide and ettringite.This directs the deposition of polydopamine on these surfaces.关键词
速凝剂/聚多巴胺/甲酸钙/水泥/吸附Key words
accelerator/polydopamine/calcium formate/cement/adsorption分类
化学化工引用本文复制引用
李佳霖,周珊珊,黄月文,王斌..聚多巴胺/甲酸钙新型喷射混凝土速凝剂的制备及机理[J].广州化学,2025,50(4):33-39,7.
