Fu Bo, Cheng Zhenyun, Han Jingyun, Li Ning
School of Civil Engineering, North Minzu University, Yinchuan 750021, China.
National Energy Group, Coal Chemical Industry Technology Research Institute, Ningxia Coal Industry Co. Ltd., Yinchuan 720021, China.
Materials (Basel). 2021 Nov 17;14(22):6962. doi: 10.3390/ma14226962.
This research investigates the mechanism of metakaolin for mitigating the autogenous and drying shrinkages of alkali-activated slag with regard to the activator parameters, including concentration and modulus. The results indicate that the incorporation of metakaolin can decrease the initial viscosity and setting time. Increasing activator concentration can promote the reaction process and shorten the setting time. An increase in the metakaolin content induces a decrease in compressive strength due to reduced formation of reaction products. However, increasing activator dosage and modulus can improve the compressive strength of alkali-activated slag containing 30% metakaolin. The inclusion of metakaolin can mitigate the autogenous and drying shrinkage of alkali-activated slag by coarsening the pore structure. On the other hand, increases in activator concentration and modulus result in an increase in magnitude of the autogenous and drying shrinkage of alkali-activated slag containing metakaolin. The influence of the activator modulus on the shrinkage behavior of alkali-activated slag-metakaolin binary system should be further investigated.
本研究针对激发剂参数（包括浓度和模量），探究偏高岭土缓解碱激发矿渣自收缩和干燥收缩的机理。结果表明，掺入偏高岭土可降低初始粘度和凝结时间。提高激发剂浓度可促进反应进程并缩短凝结时间。偏高岭土含量增加会因反应产物生成减少而导致抗压强度降低。然而，增加激发剂用量和模量可提高含30%偏高岭土的碱激发矿渣的抗压强度。掺入偏高岭土可通过使孔隙结构变粗来缓解碱激发矿渣的自收缩和干燥收缩。另一方面，激发剂浓度和模量的增加会导致含偏高岭土的碱激发矿渣自收缩和干燥收缩幅度增大。激发剂模量对碱激发矿渣-偏高岭土二元体系收缩行为的影响有待进一步研究。
