工业废弃物粉煤灰基砌块养护方法的对比研究  

Comparision of Maintenance Methods for Fly Ash/gypsum/calces Brickwork

作　　者：胥焕岩[1] 李艳[1] 李平[1] 刘伟超[1] 

机构地区：[1]哈尔滨理工大学材料科学与工程学院,哈尔滨150040

出　　处：《北京工业大学学报》2012年第1期156-160,共5页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(51002040);黑龙江省自然科学基金资助项目(E200906)

摘　　要：对比研究了3种养护方法(自然养护、湿法养护和蒸汽养护)对粉煤灰-石膏-石灰砌块抗压强度和物相组成的影响.结果表明,蒸汽养护样品的抗压强度比自然养护和湿法养护样品的抗压强度提高了1倍多,自然养护样品的水化产物以钙铝黄长石(2CaO.Al2O3.SiO2)为主,湿法养护样品的水化产物以钙长石(CaO.Al2O3.2SiO2)为主,而蒸汽养护制品的水化产物则以钙矾石(3CaO.Al2O3.3CaSO4.32H2O)为主;自然养护和湿法养护样品中火山灰反应不完全,仍有无定形的硅质玻璃体漂珠存在,而蒸汽养护制品中火山灰反应彻底,漂珠已完全消失,所形成的胶凝水化产物多以板状胶结状态存在.机理分析指出,蒸汽养护样品具有最高强度的主要原因是粉煤灰化学激发和热激发.Three maintenance methods,including natural maintenance,wet maintenance,and steamy maintenance,are comparatively investigated in this study by emphasizing their effects on the intensity and chemical components of fly ash-gypsum-calces brickwork.Experimental results show that the intensities for samples prepared under steamy maintenance are more twice than those prepared under natural maintenance and wet maintenance.XRD results revealed that cacoclasite（2CaO·Al2O3·SiO2） is the main hydrated phase for samples prepared under natural maintenance,anorthite（CaO·Al2O3·2SiO2） for ones prepared under wet maintenance and ettringite（3CaO·Al2O3·3CaSO4·32H2O） for ones prepared under steamy maintenance.SEM observations indicate that the pozzolanic reaction incompletely proceedes in the samples prepared under natural maintenance and wet maintenance,with a number of floating beads present in the hydrated phase.Whereas,for the samples prepared under steamy maintenance,the pozzolanic reaction completely proceed,and floating beads thoroughly disappear in the hydrated phase.Mechanism analysis suggests that the joint contribution of chemical stimulation and thermal stimulation is responsible for much higher intensity of samples prepared under steamy maintenance.

关 键 词：粉煤灰 养护方法 化学激发 热激发 火山灰反应 

分 类 号：TQ172.44[化学工程—水泥工业]