摘要
采用低场核磁共振技术研究了钙镁膨胀剂及其与温升抑制剂(TRI)复掺对水泥浆体早龄期水化的影响。结果表明:随着钙镁膨胀剂掺量的增加,诱导期横向弛豫T2信号量降低,稳定期T2信号量升高。复掺钙镁膨胀剂和TRI的水泥浆体随钙镁膨胀剂掺量的变化趋势与单掺钙镁膨胀剂时相似,但随TRI掺量的增加,水泥浆体的加速期和减速期显著延长,水化速率明显下降。养护温度对掺钙镁膨胀剂和TRI的水泥浆体的水化影响较大,养护温度促进了TRI的溶解与扩散,在加速期进一步降低了水化速率。
The effects of CaO-MgO blended expansive agent(CMEA) and temperature rising inhibitor(TRI) on the hydration of cement paste were investigated by low-field nuclear magnetic resonance spectroscopy. The results show that the transversal relaxation(T2)intensity increases in the dormant period and decreases in the steady period with the increase of CMEA content. The change of cement paste containing CMEA and TRI with CMEA content is similar to that of cement paste containing CMEA addition only. However, the duration of the acceleration period and deceleration period increase, and the hydration rate decrease evidently with increasing the TRI content. Moreover, curing temperature has an effect on the hydration with the combination of CMEA and TRI, and a high curing temperature promotes the dissolution and diffusion of TRI, resulting in a further decrease of hydration rate in the acceleration period.
作者
赵海涛
相宇
刘加平
陈晓东
徐文
李华
ZHAO Haitao;XIANG Yu;LIU Jiaping;CHEN Xiaodong;XU Wen;LI Hua(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;College of Materials Science and Engineering,Southeast University,Naiijing 211189,China;China Communications Construction Company Urban Investment Holding Co.Ltd,Guangzhou 510623,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2021年第11期2509-2517,共9页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金项目(51878245,U1965105)
国家重大研发计划项目(2017YFB0310100)。
关键词
钙镁膨胀剂
温升抑制剂
双重调控
水化
低场核磁共振
calcium oxide-magnesium oxide blended expansive agent
temperature rising inhibitor
dual regulation
hydration
low-field nuclear magnetic resonance spectroscopy
作者简介
第一作者:赵海涛(1978—),男,博士,副教授;通信作者:刘加平(1967—),男,博士,教授。
