基于Krstulovic-Dabic模型的复合胶凝体系水化特性研究
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摘要
将粉煤灰、矿粉、膨胀剂、纳米硅、粘改剂等掺合料按一定比例加入基准水泥中,采用等温量热仪测试了复合胶凝体系在5℃、20℃和30℃下的水化放热速率曲线。同时基于Krstulovic-Dabic模型,计算了相应的水化动力学参数,讨论了温度和掺合料对水化动力学参数的影响,探讨了复合胶凝体系复杂的水化机理。结果表明,复合胶凝体系的水化放热速率峰值随温度升高呈指数增加,而峰值到达时间则随温度升高呈指数减小,水化动力学参数随温度升高显著增大。掺合料的加入降低了复合胶凝体系的水化动力学参数和水化放热速率峰值,并使放热峰值提前出现,特别是膨胀剂和纳米二氧化硅作用显著。计算得到的反应速率曲线与测试得到的实际速率曲线的拟合精度受到温度和掺合料的影响。
Admixtures,including fly ash,slag,expansive agent,nano SiO_2 and viscosity modifier were added to the ordinary cement in different proportion. Hydration heat rate curves of the composite cementitious system at 5 ℃,20 ℃ and 30 ℃ were investigated by the isothermal calorimetry instrument.Meanwhile,the hydration kinetic parameters were calculated according to the Krstulovic-Dabic model.The influence of temperature and admixture on the kinetic parameters were discussed,and the complex hydration mechanism of the composite cementitious system were investigated. Results show that the peak value of evolution rate of the composite cementitious system increases exponentially with increasing temperature,while arrival time of evolution rate peak decreases exponentially,and the kinetic parameters increases significantly with increasing temperature. At the same time,addition of admixture decreases the kinetic parameters and the peak value of evolution rate,promotes the early emergence of the peak value of evolution rate,especially expansion agent and nano SiO_2. The fitting accuracy of the hydration reaction rate curves calculated and tested are also affected by temperature and admixture.
Admixtures,including fly ash,slag,expansive agent,nano SiO_2 and viscosity modifier were added to the ordinary cement in different proportion. Hydration heat rate curves of the composite cementitious system at 5 ℃,20 ℃ and 30 ℃ were investigated by the isothermal calorimetry instrument.Meanwhile,the hydration kinetic parameters were calculated according to the Krstulovic-Dabic model.The influence of temperature and admixture on the kinetic parameters were discussed,and the complex hydration mechanism of the composite cementitious system were investigated. Results show that the peak value of evolution rate of the composite cementitious system increases exponentially with increasing temperature,while arrival time of evolution rate peak decreases exponentially,and the kinetic parameters increases significantly with increasing temperature. At the same time,addition of admixture decreases the kinetic parameters and the peak value of evolution rate,promotes the early emergence of the peak value of evolution rate,especially expansion agent and nano SiO_2. The fitting accuracy of the hydration reaction rate curves calculated and tested are also affected by temperature and admixture.
引文
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[13]张登祥,杨伟军.粉煤灰-水泥浆体水化动力学模型[J].长沙理工大学学报,2008,5(3):88-92.
[14]Said A M,Zeidan M S,Bassuoni M T,et al.Properties of concrete incorporating nano-silica[J].Construction and Building Materials,2012,36:838-844.
[2]姚武,王伟,魏永起.硅酸盐水泥水化动力学简化模型[J].哈尔滨工业大学学报,2013,45(10):81-85.
[3]吴学权.矿渣水泥水化动力学研究[J].硅酸盐学报,1988,16(5):423-429.
[4]Krstulovic R,Dabic P.A conceptual model of the cement hydration process[J].Cement and Concrete Research,2000,30:693-698.
[5]王宁,王晴,张凯峰,等.矿渣-水泥复合胶凝体系低温水化动力学研究[J].硅酸盐通报,2015,34(7):2047-2051.
[6]权娟娟,王宁,王晴,等.不同温度下矿渣-水泥复合胶凝体系水化反应特性研究[J].硅酸盐通报,2016,35(10):3264-3269.
[7]韩方晖,王栋民,阎培渝.含不同掺量矿渣或粉煤灰的复合胶凝材料的水化动力学[J].硅酸盐学报,2014,42(5):613-620.
[8]Han F H,Zhang Z Q,Liu J H,et al.Hydration kinetics of composite binder containing fly ash at different temperatures[J].Therm.Anal.Calorim.,2016,124:1691-1703.
[9]Han F H,Zhang Z Q,Wang D G,et al.Hydration kinetics of composite binder containing slag at different temperatures[J].Therm.Anal.Calorim.,2015,121:815-827.
[10]阎培渝,郑峰.水泥基材料的水化动力学模型[J].硅酸盐学报,2006,34(5):555-559.
[11]阎培渝,郑峰.温度对补偿收缩复合胶凝材料水化放热特性的影响[J].硅酸盐学报,2006,34(8):1006-1010.
[12]Liu S H,Wang L,Gao Y X,et al.Influence of fineness on hydration kinetics of supersulfated cement[J].Thermochimica Acta,2015,605:37-42.
[13]张登祥,杨伟军.粉煤灰-水泥浆体水化动力学模型[J].长沙理工大学学报,2008,5(3):88-92.
[14]Said A M,Zeidan M S,Bassuoni M T,et al.Properties of concrete incorporating nano-silica[J].Construction and Building Materials,2012,36:838-844.