Rheological Properties and Hydration Mechanism of Finely Ground Limestone Powder-Cement

Abstract

Abstract: In order to study the effect of limestone powder fineness and dosage on the rheological properties and hydration process of cement paste, the rheological properties of freshly mixed paste were tested by Anton Paar rheometer, and the thixotropy of paste was characterized by calculating the thixotropic annulus area. Meanwhile, the mechanism of the influence of limestone powder on the rheological behavior of cement paste was explained by using the results of wet stacking density test and the calculation of the thickness of water film powder on the rheological behavior of cement paste was clarified by microcalorimetry test and quantitative analysis. Finally, the influence of limestone powder on the hydration process of cement was clarified by microcalorimetric test and XRD quantitative analysis. The results show that, at 10% dosage, the doping of 1 000 mesh (5.25 μm) stone powder reduces the yield stress by 48.4% compared with that of 400 mesh (17.34 μm) stone powder, but it improves by 15.6% compared with that of 600 mesh stone powder. At the same fineness, the doping of 10% and 20% 600 mesh (11.23 μm) stone powder reduces the yield stress of the paste by 76.7% and 81.8% compared with that of the blank group, respectively. Doping stone powder reduces the thixotropic behavior of paste and changes the variation rule of thixotropy with time. Increasing the fineness and dosage of stone powder increases the wet packing density of paste, and the thickness of water film layer, resulting in a decrease in yield stress and consistency of slurry. Increasing the fineness of stone powder can shorten the hydration induction period, move the second exothermic peak of hydration forward, and promote the early dissolution of C₃S and the generation of C-S-H, which can accelerate the hydration process of cement.

Key words: limestone powder, cement paste, rheological property, yield stress, hydration mechanism

CLC Number:

TU528

DENG Guoqing, TU Linchun, ZHAO Wenhao, LI Wei. Rheological Properties and Hydration Mechanism of Finely Ground Limestone Powder-Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(11): 3807-3815.

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