The present work reports the effect of waste glass (WG) on the properties of Portland cement through Electron Para- magnetic Resonance (EPR) study. Cement pastes containing 0, 10, and 30% replacement of waste glass wi...The present work reports the effect of waste glass (WG) on the properties of Portland cement through Electron Para- magnetic Resonance (EPR) study. Cement pastes containing 0, 10, and 30% replacement of waste glass with cement and in a water to cement ratio of 0.4 have been prepared. The g factors of Fe(III) and Mn(II) impurities at different hydration ages have been calculated. The decreased gFe values and simultaneous increase in gMn values with increase in replacement % of WG are explained due to retardation of cement hydration.展开更多
某项目采用立磨生产CEM I 52.5水泥。在调试过程中,通过加高挡料圈、优化磨内喷水管布置、优化操作参数等手段,水泥立磨实现稳定达产运行;通过提高C3A含量,减少磨内喷水量,提高出磨温度等措施,水泥的凝结时间显著缩短,胶砂强度符合EN197...某项目采用立磨生产CEM I 52.5水泥。在调试过程中,通过加高挡料圈、优化磨内喷水管布置、优化操作参数等手段,水泥立磨实现稳定达产运行;通过提高C3A含量,减少磨内喷水量,提高出磨温度等措施,水泥的凝结时间显著缩短,胶砂强度符合EN197(2001)CEM I相关标准。该立磨系统试生产调试结果表明:(1)合适的挡料圈高度,合理的喷水管形式与布置,以及合理的磨机操作方法是立磨达到最大产能的关键因素;(2)降低磨内喷水是提高水泥强度,降低凝结时间的主要途径;(3)提高熟料矿物C3A含量与出磨温度有利于缩短凝结时间,增加强度。展开更多
The future development of cities has a great relationship with economic vitality.To determine the size of the economic vitality and its main influencing factors.This article takes some cities in China as examples.Firs...The future development of cities has a great relationship with economic vitality.To determine the size of the economic vitality and its main influencing factors.This article takes some cities in China as examples.First,determine the main factors.Aiming at many factors,this paper starts from the perspective of population changes in different cities and changes in corporate vitality.After applying the rough set theory to objectively evaluate index weights,the main factors are screened out.Then,the weights of the corresponding evaluation indexes of each group of cities are calculated by a multiple linear regression to a weighted index system,and then the cities are ranked using the gray correlation analysis method.Finally,we get the ranking of the economic vitality level of different cities.Finally,suggestions are made based on the weighting factors of major factors and economic vitality.展开更多
文摘The present work reports the effect of waste glass (WG) on the properties of Portland cement through Electron Para- magnetic Resonance (EPR) study. Cement pastes containing 0, 10, and 30% replacement of waste glass with cement and in a water to cement ratio of 0.4 have been prepared. The g factors of Fe(III) and Mn(II) impurities at different hydration ages have been calculated. The decreased gFe values and simultaneous increase in gMn values with increase in replacement % of WG are explained due to retardation of cement hydration.
文摘某项目采用立磨生产CEM I 52.5水泥。在调试过程中,通过加高挡料圈、优化磨内喷水管布置、优化操作参数等手段,水泥立磨实现稳定达产运行;通过提高C3A含量,减少磨内喷水量,提高出磨温度等措施,水泥的凝结时间显著缩短,胶砂强度符合EN197(2001)CEM I相关标准。该立磨系统试生产调试结果表明:(1)合适的挡料圈高度,合理的喷水管形式与布置,以及合理的磨机操作方法是立磨达到最大产能的关键因素;(2)降低磨内喷水是提高水泥强度,降低凝结时间的主要途径;(3)提高熟料矿物C3A含量与出磨温度有利于缩短凝结时间,增加强度。
文摘The future development of cities has a great relationship with economic vitality.To determine the size of the economic vitality and its main influencing factors.This article takes some cities in China as examples.First,determine the main factors.Aiming at many factors,this paper starts from the perspective of population changes in different cities and changes in corporate vitality.After applying the rough set theory to objectively evaluate index weights,the main factors are screened out.Then,the weights of the corresponding evaluation indexes of each group of cities are calculated by a multiple linear regression to a weighted index system,and then the cities are ranked using the gray correlation analysis method.Finally,we get the ranking of the economic vitality level of different cities.Finally,suggestions are made based on the weighting factors of major factors and economic vitality.
