摘要
用低场核磁共振技术考察了HN-1型缓凝剂对水泥浆体中可蒸发水的横向弛豫时间（T2）及状态演变过程的影响。结果表明：在初始水化阶段的150 min内,水泥浆GR（添加缓凝剂HN-1的水泥净浆）的弛豫峰峰形和峰顶位置均无明显变化,水泥浆G（纯水泥净浆）的弛豫峰峰形变窄且峰顶位置从2.15 ms迁移至0.95 ms,说明缓凝剂HN-1主要通过改变水泥浆体中不同状态水的存留时间来改变其水化进程。随养护时间的延长,硬化水泥石W0.44和WR0.5中可挥发水弛豫峰分布范围分别从0.11-4.75 ms变为0.08-0.58 ms、0.24-4.23 ms变为0.11-2.35 ms,总体趋向于短弛豫时间,表明水泥石中毛细水逐渐向凝胶水和物理结合水转化,水泥石养护龄期延长至25 d时,其内部凝胶结构水含量超过90%。利用XRD考察了缓凝剂对水泥浆水化产物的影响,结果表明：缓凝剂只改变水泥浆水化过程,对最终水化产物晶型及晶型结构不存在任何影响。
Low-field nuclear magnetic resonance technique was used to study the effects of retarder of HN - 1 on the transverse relaxation time （ T2 ） of water in pure cement paste and the cement paste with different addition of retarder in different time during the hydration and the states evolution of water in the cement paste. The comparison of the relaxation peak within 150 min showed that the peak and peak position of the cement paste with retarder （GR） had not significant change while the peak of slurry without retarder （G） became narrow and the peak the relaxation peak tended to short relaxation time point from 2.15 ms changed into 0.95 ms,namely, direction, therefore, the retarder HN - 1 changed the hydration process by changing the exist time of different state water. It was also found that the relaxation time of volatile water in hardened paste tended to be shorter when the curing time increased, the relaxation peak of cement stone W0.44 from 0. 11 - 4.75 ms changed into 0. 08 - 0.58 ms, and the relaxation peak of cement stone WR0.5 from 0.24 - 4.23 ms changed into 0. 11 -2. 35 ms, which showed that the transition from capillary water to gel water and physical bound water occurred, when the curing time extended to 25 d, the content of gel water can come to 90%. The influence of retarders on cement hydration products was investigated by XRD. The results showed that the retarder have changed the hydration process only, but it had no effect on the crystal and crystal structure of final hydration products.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2016年第12期1416-1421,共6页
Fine Chemicals
关键词
低场核磁
HN-1型缓凝剂
弛豫时间
孔结构
X衍射
油田化学品
low-field nuclear magnetic resonance technique
retarder of HN - 1
relaxation time
porestructure
XRD
Oil-field chemicals
