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silica cement in thin section dark

File FileThin FileGabbro pmg ss File In optical mineralogy and petrography a thin section or petrographic thin section is a laboratory preparation of a rock mineral soil pottery bones or even metal sample for use with a polarizing petrographic microscope electron microscope and electron microprobe

April 17,2020 by: Crystal Webster
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Skeletal Grains SEPM Strata

Chapter 6 OTHER SEDIMENTARY ROCKS CHERT AND

1122 Hydraulic Cement Concrete 11221 Ground Granulated BlastFurnace Slag This is a threestep procedure Examine exterior surfaces broken surfaces and lapped slices of the HCC When very young the pastes containing slag are a characteristic dark bluish green Mather 1957 investigated the reasons for this color in portland slag cements and concluded that the development of the color

The opal cement is followed by a thin porerimming zone of chalcedony cement that has a slight brown coloration The final stage of cementation is colorless chalcedony These are volcanicrich sediments and the alteration of lithic fragments and siliceous ash is the source for the silica cements

Skeletal Grains SEPM Strata

Petrography Of Sedimentary Rocks In The Slick Rock

1122 Hydraulic Cement Concrete 11221 Ground Granulated BlastFurnace Slag This is a threestep procedure Examine exterior surfaces broken surfaces and lapped slices of the HCC When very young the pastes containing slag are a characteristic dark bluish green Mather 1957 investigated the reasons for this color in portland slag cements and concluded that the development of the colorThe opal cement is followed by a thin porerimming zone of chalcedony cement that has a slight brown coloration The final stage of cementation is colorless chalcedony These are volcanicrich sediments and the alteration of lithic fragments and siliceous ash is the source for the silica cementsCalcite cement is common authigenic minerals in sandstones of the Heidrun field and also noticeable in some samples of the Smrbukk field Thin section study indicates that calcite cement constitutes 0103 of the sandstone samples of the Smrbukk field and 66203 of the sandstone samples of the Heidrun fieldIf deterioration is determined to be caused by the expansion of the concrete of the placement and there is no evidence of alkalisilica gels even when the HCC is examined in thin sections with the petrographic or PEF microscope the distress must be the result of a cause other than the ASRIn thin section this may be indicated by the presence of leached secondary deposits of calcium carbonate and cement matrix replacement 236 andor cracking 237 236 Leached HAC concrete possibly suffering from alkaline hydrolysisEttringite crystals in air voids and cracks are typically 2 to 4 micrometers in crosssection and 20 to 30 micrometers long Under conditions of extreme deterioration and repeated wetting and drying ettringite crystals can appear to completely fill voids or cracks HoweverGY 402 Sedimentary Petrology Lecture 11 Mature Siliciclastic Environments Generally dark in color Cement Quartz overgrowth cement Thinsection Photomicrographs Todays Agenda 1 Factors promoting beach development 2 Beach profiles 3 Beach facies sedimentary sectionsPortland cement binders for mortars and renders have a similar appearance in thin section to the cement matrix of hardened concrete Figure 309 shows a typical uncarbonated Portland cementsand mortar with an isotropic matrix of calcium silicate hydrates including dispersed portlandite calcium hydroxide crystallites firstorder red and secondorder blue interference colours in crossThe silica stockwork in Units 11 and 13 is interpreted to be equivalent to the silica cement of the intercalated volcaniclastic units and shows asimilar later relationship to pervasive bleaching Thinsection petrography and XRD analyses indicate that silica polymorphs are the dominant alteration minerals Table T8 occurring as granularChert Textures Introduction MacroTextures MicroTextures Introduction The Rhynie chert examined from float blocks trench and cored material exhibits a wide range of macrotextures those large enough to be visible in hand specimen and microtextures those clearly visible using optical microscope techniques Studying both together with the biota the individual beds contain canthe rock is bound by silica cement grown in optical continuity of the detrital clasts Matrix is negligible to nil based on clast composition and matrix content it is classified as quartz areniteattributed to alkalisilica reactivity by Stanton 1940 The spotty surface discoloration which is sometimes observed in the field was found to be the result of exudations of a very fluid alkalisilica gel centered over the reacted shale particles This gel which is the reaction product between the opal in the shale and the cement alkaliesPetrographic analysis For this study I examined 152 thin sections of sandstone and siltstone samples from the Rock Lake Shale Member of the Stanton Limestone The siliciclastic components of these rocks consist mainly of monocrystalline and polycrystalline quartz with minor amounts of orthoclase plagioclase microcline muscovite zirconIt is a matter of debate No doubt both of them fill the interstitial spaces in a clastic sedimentary rock While the cement is authigenic formed during sedimentation by precipitation or recrystallization matrix can be both detrital or authigEttringite crystals in air voids and cracks are typically 2 to 4 micrometers in crosssection and 20 to 30 micrometers long Under conditions of extreme deterioration and repeated wetting and drying ettringite crystals can appear to completely fill voids or cracks However ettringiteSep 28 2010 Silica Dust 2 nd most common element in the earths crust 277 Found in many types of rock and ore Respirablesized silica particles liberated during drilling crushing loading and dumping Silica particles embedded in limestone THIN SECTION 200x MAGNIFICATIONThis Collection contains 15 Types of Minerals Specimens Used in Cement Industry This Kit include Some of the following Minerals Asbestos Barytes Bauxite Calcite Clay Feldspar Flourite Gypsum Laterite Lignite Lime Stone Mica Pumice Red Ochre Silica Sand etcChromite is darkbrown to opaque at full thin section thickness Chromite is a spineltype mineral like magnetite and has an extensive solid solution in the magnetite composition direction CrMgAlrich chromites are realtively transparent and can be darkbrown at full thin section thicknessCrack distribution in thin section Extensive microcracking expansion has occurred Yes Thin section examination for gel Isotropic gel gel filled microcracks gel saturated paste Yes Reactive silica In sand fraction Yes Cement content 530 kgm 3 Yes Solubilized silica content from aggregate Estimated original alkali content 5In unrestrained concrete that is without any reinforcement ASR causes characteristic map cracking or Isle of Man cracking Gel may be present in cracks and within aggregate particles The best technique for the identification of ASR is the examination of concrete in thin sectionThinsection microscopy of this zone indicates resistivity is directly related to abundant cement Calcite cement is predominant Figure 25 and nearly occludes porosity in this zone Less pervasive silica cement gives the same white signature as the calciteof concrete thinsection analysis and the SEM study confirmed this finding Keywords alkali silica reaction ASR recrystallized silica petrographic ASR gel accelerated test INTRODUCTION The first evidence of alkali silica reaction ASR Sujjavanich et al 2010 Sujjavanich et al 2012a and continued research works on localDiagenesis and Its Effect on Reservoir Quality of Silurian Sandstones Tabei Area Tarim Basin China Vol4 No3 3 Fig 3 Types of sandstone from the Silurian reservoir Tarim Basin in middle Sk left and upper Sk right After Folk 1968 formations the middle Sk the lower and upper St sandstones are well sorted but the upper Sk sandstonesPlane polarized light photomicrograph of polished concrete thin section showing alkalisilica reaction ASR gel filled cracks extending from reactive aggregate into the cement paste Visit our publications page to learn more about this investigation and our surprising resultsChapter 6 OTHER SEDIMENTARY ROCKS CHERT AND EVAPORITES 1 CHERT 11 Introduction 111 Chert is the general term for very finegrained and nonporous sedimentary rocks that consist mostly or entirely of silica in the form of either amorphous silicaFile FileThin FileGabbro pmg ss File In optical mineralogy and petrography a thin section or petrographic thin section is a laboratory preparation of a rock mineral soil pottery bones or even metal sample for use with a polarizing petrographic microscope electron microscope and electron microprobe

Skeletal Grains SEPM Strata

Alkali Silica Reactivity In Concrete

1122 Hydraulic Cement Concrete 11221 Ground Granulated BlastFurnace Slag This is a threestep procedure Examine exterior surfaces broken surfaces and lapped slices of the HCC When very young the pastes containing slag are a characteristic dark bluish green Mather 1957 investigated the reasons for this color in portland slag cements and concluded that the development of the color

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