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The cement content replaced with dolomite and fine aggregate replaced with copper slag from 5% to 25% at regular intervals of 5%. In the designed mix proportion of M30 grade concrete is 1:2.17:2.95.
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Isopachous fringe cement presents only around skeletal grains from topmost part of Um Gheig Formation It is formed of anhedral granular dolomite crystals and followed by the precipitation of micritic marine cement (Fig. 6C, D). The size of individual crystals ranges between 3 and 5 μm.
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In particular, the presence of primary dolomite cement precipitates within botryoidal dolomite can reflect that the specific "dolomite seas", associated with anoxic or even euxinic shallow water conditions (inferred by redox-sensitive trace elements and REEs) and increased microbial activity, also prevailed in the terminal Ediacaran ocean.
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Bladed dolomite cement was subsequently precipitated from (modified) seawater-dominated porewaters. In the intermediate burial regimes, medium- to coarse-crystalline dolomite cement was formed during reduction of Mn oxides. In the deep-burial regimes, saddle dolomite was precipitated from hydrothermal fluids and yields REY …
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Granular dolomite cement caused porosity loss of 20–25% and left some isolated intergranular pores and intercrystalline pores. In the meantime, dolomite crystals become thicker and form into powder-fine …
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Petrological characteristics of void-filling dolomite/dolomite cement. (A). Plane-polarized-light image of a Cd1 sample with fine-medium crystalline size showing dolomite cement filling along the inner wall of the calcite-filled fracture. The sample was obtained from well QZ12 in the Buqu Formation at a depth of 62.75 m. (B). Plane …
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Constraining the origin of the drusy dolomite in terms of whether it has been precipitated as cement, which is a common cement in limestones [13,14] or formed by …
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The present examinations indicate that the use of dolomite limestone as component instead of limestone is a viable solution for producing Portland dolomite …
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Dolomite occurs as a primary void-filling cement and by replacing micritic sediments, red algae, and echinoderm grains (Swart and Melim, 2000). Both settings of penecontemporaneous dolomite formation appear to be linked to the "microbial model" or "organogenic model" of dolomitization ( Vasconcelos and McKenzie, 1997 ; Burns et al ...
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The Acid Test on Rocks. LIMESTONE, DOLOSTONE, AND MARBLE. Some rocks contain carbonate minerals, and the acid test can be used to help identify them. Limestone is composed almost entirely of calcite and will produce a vigorous fizz with a drop of hydrochloric acid. Dolostone is a rock composed of almost entirely of dolomite. It will …
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Primary fibrous dolomite was a common marine cement during the Neoproterozoic, distributed in carbonate lithologies underlying slightly oxygenated surface waters to anoxic deep waters 1,2,3,4,5,6 ...
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The dolomite cement can also be primary dolomite cement or the replacement of calcite cement (Adams and Mackenzie, 1998). Dolomite cement rims on detrital grains are noticed in Permian Park City Formation of Utah, USA (Fig. 11A; Scholle and Ulmer-Scholle, 2003). Dolomite overgrowths are noticed in Lower Cretaceous …
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Dolomite cement is a significant and widespread component of Phanerozoic sucrosic dolomites. Cements in dolomites that were never deeply buried are limpid, have planar faces (non-saddle forms ...
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Dolomite Dol-II is also crosscut by postdates fabric destructive fracturing (Fig. 4e). This type of dolomite is also present in association with coarse grain cementing saddle dolomite SD and calcite cement (Fig. 4f). The third type of dolomite is Dol-III revealing non-planar anhedral crystal morphology having fine grain size ranging from 10 …
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Two types of 'dolomite formation' are common, i.e., 'dolomitization', which is the replacement of CaCO 3 by CaMg(CO 3) 2, and 'dolomite cementation', which is the precipitation of dolomite from aqueous solution as a …
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The possibility of dolomite powder as a cement substitute is the subject of a research project. Examples of M30 mix concrete are made by replacing 5, 10, 15, and 20. and 25 percentage of cement's weight in dolomite powder. Harden characteristics were identified and compared to traditional harden characteristics at 7 and 28 days.
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In MV1, microcrystalline dolomite forms a mesh-like fabric in the calcite matrix (Fig. 5a) while dolomite in MV2 exhibits replacive cement of the pre-existing calcite matrix with clear delineation ...
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The purpose of this study is to provide a better understanding of the reaction mechanism of dolomite powder in Portland-dolomite cement (PDC). The hydration …
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Applications in Detail. Construction: Dolomite, in its crushed form, is used for producing concrete and cement. Its high hardness makes it a robust material for construction purposes. Agriculture: Farmers use dolomite for agricultural pH control. The chemical industry uses the mineral dolomite in making magnesium salts.
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Dolomite cement in carbonate rocks commonly develops rhombic crystals that do not show systematic size variation within the pores . Nevertheless, rare drusy mosaic dolomite cement has been reported in carbonate deposits too [12,13,14,15]. The origin of such dolomite is not fully explored, particularly regarding whether it is a primary ...
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cement comprises 11% to 45% (32% mean) of peritidal to sub-tidal dolomites on an outcrop in the Edwards aquifer (Early Cretaceous) of central Texas; 19% to 33% (25% mean) of …
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In this model, the initial fabric is completely obliterated leaving important intercrystalline water-filled pore while the rigid framework formed by the dolomite cement tends to slow compaction. Further overgrowth of the dolomite cement filling the available pore space coarsen the initial dolomite texture as long as pore space is available.
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It has been reported that the incorporation of dolomite powder can improve the workability and early-age strength of mortar, and promote the formation of …
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Tendency to chemical cement. Ash: unconsolidated fragments under. 4 mm. Tuff: consolidated ash. Volcanic Breccia: angular fragments over 4 mm. Agglomerate: large proportion (>25%) of bombs. These rocks are classified on the proportions of vitric, crystal (mineral), or lithic material they contain, for example, "vitric lithic ash," or "crystal ...
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Dolomite Cement. Dolomite cement is a part of phanerozoic sucrosic dolomite. Dolomite cement has a planar surface with a porous texture. It often has a distinct zonation in cathodoluminescence. Dolomite Pottery. Dolomite is used as a ceramic material to make pots and other items since it is an excellent source of calcia and …
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PDF | On Sep 28, 2023, Rahul Shivaji Divekar and others published Dolomite Powder in Concrete: A Review of Mechanical Properties and Microstructural Characterization | …
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Four replacement dolomite (RD) phases were also identified (RD1, RD2, RD3, and RD4) in addition to saddle dolomite cement (SDC), which is petrographically similar to a fracture- and stylolite-filling dolomite cement (DC1) phase. Authigenic quartz was also observed within vugs lined with SDC crystals that have irregular crystal faces.
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Dolomite cements. Dolomite cement occurs as pore filling phase in the form of matrix replacive dolomite cement (RD), saddle dolomite cement (SD) and coarse-grained cementing dolomite (CD). Replacive dolomite cement (RD) Matrix replacive dolomite cement occurs as patchy dolomite bodies within the weak planes and voids …
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The sandstone has changed into a tight sandstone reservoir because of the early calcite cement and the ferroan calcite and ferroan dolomite cement occurring in the late diagenesis stage. During the burial stage, the early carbonate cement is dissolved, which improves the porosity of the sandstone.
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The research on the developmental characteristics and evolution process of pores in dolomite reservoirs is a hot spot in petroleum geology. In this paper, taking the dolomite reservoirs of the Longwangmiao Formation in the Gaoshiti area as an example, the differential distribution and evolution of pore parameters have been systematically …
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