摘要
采用激发剂单掺和复掺的方式对固硫灰的火山灰活性和自硬性进行激活,对比分析了固硫灰7d和28d的抗压强度,同时利用水化热测量、XRD和红外(FT-IR)分析等方法分析激发剂对固硫灰早期水化活性的影响。结果表明:不同种类激发剂激发固硫灰早期活性的顺序为:生石灰>水玻璃>三乙醇胺>Na2SO4;Na2SO4能够有效地促进固硫灰中硬石膏的溶解析晶,当Na2SO4与TEA复掺时,可以避免Na2SO4激发固硫灰后期强度发展缓慢的缺点;在固硫灰中添加适量生石灰可以显著提高固硫灰活性;4种激发剂复掺时,固硫灰7d和28d强度分别达到7MPa和22MPa,推荐采用复合激活方法激发固硫灰活性。
The pozzolanic and self-cementitious properties of CFBC fly ash with various chemical activators were investigated.The effect of different chemical activators and their different combinations on the mechanical properties of CFBC fly ash was evaluated based on the criteria of 7 d and 28 d compressive strengths of CFBC fly ash.Meanwhile,the influence of chemical activators on the early hydrating process and hydrated products of CFBC fly ash were analyzed with isothermal calorimeter method,XRD and IR.The results show that different activators obviously affect the strength of hardened CFBC fly ash paste and the degree of impact in order is as follows： limesodium silicateTEANa2SO4;the addition of Na2SO4 promotes the dissolution of anhydrite and increases its hydration rate,composite activation of Na2SO4 and TEA can solve the question that compressive strengths of CFBC fly ash with adding Na2SO4 increases slowly;the addition of lime significantly improves the activity of CFBC fly ash;the combination of four activators mentioned above are recommended to use for increasing the activity of CFBC fly ash,resulting into the 7 d and 28 d compressive strength of the mortar is up to 7 MPa and 22 MPa,respectively.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2012年第12期9-13,共5页
Journal of Wuhan University of Technology
基金
"十二五"国家科技支撑计划(2011BAA04B04)
关键词
固硫灰
激发剂
水化热
强度
CFBC fly ash
activator
hydration heat
strength
