Pozzolanic reactivity and hydration products of quartz

摘要

With quartz, desulfurized gypsum and calcium hydroxide as the materials, this paper studies the pozzolanic reactivity of finely ground quartz and performs XRD, IR, DSC, NMR and SEM analysis on the hydration products of the neat paste specimens. The results show that the compressive strength of the finely ground neat quartz paste specimen is 5.66MPa and 23.49MPa respectively at the age of 3d and 28d, which indicates that the finely ground quartz has the pozzolanic reactivity, and that its main hydration product is C-S-H gel. With the curing age, C-S-H gel and zeolite-like facies continuously increase, and C-S-H gel is produced on the surfaces of quartz particles, gradually make the gaps smaller between quartz particles.