inorganic laboratory-preparations by Schlessinger G

By Schlessinger G

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The overall effect of these reactions was estimated to have increased the porosity of some parts of the shale fill by up to 10%, with possibly significant implications for its geotechnical behavior (Fig. 8). , 1994; Pye and Mottershead, 1995). 8. K. P = porosity formed by calcite dissolution; G = authigenic gypsum; FeS = pyrite. Scale bar = 20 /xm. 31 SEDIMENT GRAINS, WEATHERING, AND EARLY DIAGENETIC PHENOMENA both on the surface and within the stone. The limestone that had an oosparitic texture showed better resistance to decay than did the stone having an oomicritic texture, despite being exposed to higher pollution levels at its collection site in central London.

Scale bar = 100/^m. 25. K. Scale bar = 100 jum. 26. K. Scale bar = 20 /xm. 27. K. Remaining areas of aragonite (A) appear relatively dark. Scale bar = 100 /xm. f-'t 45 SEDIMENT GRAINS, WEATHERING, AND EARLY DIAGENETIC PHENOMENA complex textural and mineralogical compositional pattern in the rock. 28 shows a relatively young groundwater calcrete collected from a dry stream bed developed on granitoid gneiss in semiarid Kenya (Pye and Coleman, in press). The rock has a high detrital matrix to cement ratio, the detrital component consisting mainly of sand- and silt-size quartz and feldspar fragments, with subsidiary mica.

Scale bar = 100 /x,m. 33 SEDIMENT GRAINS, WEATHERING, AND EARLY DIAGENETIC PHENOMENA of large amounts of ettringite is detrimental to the strength of the concrete because this calcium-alumino-sulfate mineral contains 31 water molecules in its structure and is prone to large volume changes. These water molecules cause expansion of the concrete and progressively reduce its strength. In extreme cases, concrete that has been severely affected by sulfate attack becomes crumbly and disintegrates altogether.

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