摘要
大量基础处理灌浆工程,特别是服役水工混凝土结构防渗堵漏存在可灌性差、灌浆效果难以保证等难题。采用化学灌浆材料成本高,优选的超细水泥灌浆材料可灌性和灌浆效果虽有所提升,但目前干法制备成本偏高、湿法制备的粒径偏大。为克服超细水泥制备现有技术的不足,基于振动、空化、湿磨复合效应,研发振动空化复合湿磨设备。通过开展多工况试验,研究制备效果的影响因素及相关参数。对比试验三种常用水灰比的普通水泥浆液,结果表明,空化振磨15 min后,水泥颗粒破碎率可得到显著提升。产生累积达19.19%的粒径小于1μm的纳米级水泥颗粒,水泥颗粒粒度D_(50)小于10μm,D_(90)小于30μm,比表面积达到700~1200 m^(2)/kg。同比国内现有水泥湿磨机技术指标,D_(90)减小达25%,且设备成本大大降低,无需多次研磨即可达到技术要求。另外,对设备进行循环运行改造即可实现连续制浆,制备效率能满足灌浆强度的要求,技术成果具备广泛的工程应用前景。
A large number of foundation treatment grouting projects,especially the seepage control and plugging of hydraulic concrete structures in service,have problems such as poor groutability and difficult to guarantee the grouting effect.The cost of chemical grouting material is high.Although the groutability and grouting effect of the optimized superfine cement grouting material have been improved,the cost of dry preparation is high and the particle size of wet preparation is large.In order to overcome the shortcomings of the existing technology for the preparation of ultrafine cement,this paper develops a vibration-cavitation composite wet grinding equipment based on the composite effect of vibration,cavitation and wet grinding.Through the multi-condition test,the influencing factors and related parameters of the preparation effect are studied.Comparing the three common cement slurry with water-cement ratios,the results show that after cavitation vibration grinding for 15 min,the crushing rate of cement particles can be significantly improved.Nano-sized cement particles with a cumulative particle size of 19.19%and less than 1μm.The particle size D_(50) of cement particles is less than 10μm,D_(90) is less than 30μm,and the specific surface area reaches 700~1200 m^(2)/kg.Compared with the existing domestic cement wet mill technical indicators,D_(90) is reduced by 25%.And the equipment cost is greatly reduced,without multiple grinding can meet the technical requirements.Moreover,the continuous pulping can be realized by recycling the equipment.And the preparation efficiency of ultra-fine cement can fully meet the requirements of grouting strength.The technical achievements have broad engineering application prospects.
作者
曹培智
张贵金
陈安重
CAO Peizhi;ZHANG Guijin;CHEN Anzhong(Colllege of Hydraulic and Environmental Engineering,Changsha University of Science and Technology,Changsha 410114,Hunan,China;Hunan Provincial Key Laboratory of Water and Sediment Science and Water Disaster Prevention,Changsha 410114,Hunan,China;Power China Group,Central South Engineering Corporation Limited,Changsha 410114,Hunan,China)
出处
《水利水电技术（中英文）》
北大核心
2022年第11期197-205,共9页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(51279019)
湖南省重大水利科技项目[湘水科计(2017)230-37]。
关键词
超细水泥
空化作用
颗粒破碎
粒度分析
振动湿磨
super-fine cement
cavitation
particle fragmentation
particle size analysis
vibration wet grinding
