Because gypsum content was relevant in the studied soils, a temperature of 50[degrees]C was used to avoid constitutional water release by the gypsum crystal following the transformation of gypsum into bassanite
or anhydrite at temperatures >50[degrees]C (Herrero et al.
The mineral part of analysed samples is composed of clays, feldspars, carbonates, analcime, natrolite, quartz and bassanite (Table 1).
Carbonates are predominant minerals, aragonite, bassanite and series of 4-methylsteranes were identified exclusively in this sample, whereas minerals of feldspar and zeolite groups, as well as dolomite and Carich dolomite (or ankerite) were absent.
Experimental VNIR reflectance spectroscopy of gypsum dehydration: Investigating the gypsum to bassanite transition.
15 NI NI Bassanite NI NI NI NI NI NI NI Microcline 15.
4), which demonstrated that in activated E-PG specimens no bassanite
was found, while in the case of gypsum cement the peaks of unhydrated gypsum were sufficiently distinct.
Any additional mass loss indicated microwave overheating and the transformation into bassanite or anhydrite.
Both gypsum samples could be dried to zero moisture and in addition, changed into another mineral, bassanite.
The major objective of this research was to demonstrate the ability of microwaves to remove the free surface water from the fine FGD gypsum to a level of 1% or less without changing the gypsum to bassanite or anhydrite.
The gypsum data results are plotted at the top above "stick figure" graphs of the X-ray standards for pure gypsum, bassanite and anhydrite.
2%), but resulted in a slightly noticeable indication that bassanite was produced.
Bates and Klein in 1917 (3) investigated the hydraulic properties and strength development of the primary cement compounds, the nature of their hydration products, and the influence of bassanite
(plaster of Paris) in improving early-age strength.