Investigation of the Synthesized Retarder on Cement Slurry Hydration Based on Low Field NMR

In this paper, Low Field nuclear magnetic resonance (NMR) was used to study the effects of synthesized retarder HN (which is the symbol of synthesized retarder) on the water states' variation in the hydration process of cement slurry specimens. Retarder HN was prepared by acrylamide, 2-acrylamido-2-methyl propane sulfonic acid, and maleic anhydride, and the chemical structure was confirmed by Fourier-transform infrared spectroscopy and elemental analysis. Then, Low Field NMR was employed to test the transverse relaxation time distribution of the cement slurry specimens and cement stones. Here, the cement slurry and cement stone specimens have different cement-to-water ratio, retarder HN adding amount and curing age. The Low Field NMR can be used to characterize the water states and study the water states, variation in the cement slurry hydration process. Of course, the pore distribution development of cement stones was also studied in our research. Additionally, the phase analysis of cement hydration products was produced by an X-ray diffractometer, and the results showed that the retarder HN has a significant effect on the cement hydration process but without any effect on final cement hydration products.