硅酸盐通报2026，Vol.45Issue(4)：1184-1192,1219,10.DOI:10.16552/j.cnki.issn1001-1625.2025.0921
促凝早强剂对喷射混凝土性能的影响
Effect of Accelerator and Early Strength Agent on Properties of Shotcrete
摘要
Abstract
In view of the problems of ordinary shotcrete,such as prolong setting time and slow development rate of extremely early strength,a self-made setting accelerator and early strength agent was employed for modification.The effects of accelerator and early strength agent on setting time of cement paste,workability and mechanical properties of shotcrete were investigated,and the modification mechanism was analyzed by means of tests such as hydration heat,X-ray diffraction(XRD),thermogravimetric(TG-DTG)and scanning electron microscopy(SEM).The results show that the in corporation of the accelerator and early strength agent slightly reduces the workability of concrete,it can significantly improve the setting accelerator effect and mechanical properties of shotcrete.When the dosage of the accelerator and early strength agent is 4％(mass fraction),its slump decreases to 185 mm.Compared with the group without the accelerator and early strength agent,the initial setting time and final setting time are shortened by 50.0％and 45.5％respectively.The compressive strength at 3 h,8 h,1 d and 28 d increased by 128.6％,79.7％,26.7％and 2.6％respectively.Mechanism analysis indicates that the sulphoaluminate clinker and nanomaterials in the accelerator and early strength agent can significantly accelerate the hydration process of the cement paste,promoting the formation of hydration products such as needle-rod-like ettringite(AFt)and flocculent calcium silicate hydrate(C-S-H)gel,and make the internal structure of the concrete more dense,thereby effectively improving the accelerating setting effect and mechanical properties of shotcrete.关键词
喷射混凝土/促凝早强剂/凝结时间/工作性能/力学性能/改性机理Key words
shotcrete/accelerator and early strength agent/setting time/workability/mechanical property/modification mechanism分类
建筑与水利引用本文复制引用
李顺凯,陈荣辉,董勋,窦华康,孙凤品..促凝早强剂对喷射混凝土性能的影响[J].硅酸盐通报,2026,45(4):1184-1192,1219,10.基金项目
广西重点研发计划项目(2021AB22157) （2021AB22157）
南宁市重点研发计划项目(20231045) （20231045）
