scholarly journals Silt content approximation of Neogene Surma group mudrocks, Sitakund anticline, Bengal basin

2018 ◽  
Vol 30 (1-2) ◽  
pp. 35-43
Author(s):  
Md Yousuf Gazi ◽  
SM Mainul Kabir ◽  
Md Badrul Imam
Keyword(s):  
Particle Size Analysis ◽  
High Rate ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Bengal Basin ◽  
Geologic History ◽  
Thin Sections ◽  
Silt Content ◽  
Rate Of Sedimentation ◽  
Surma Group

Petrography of the Neogene mudrocks in this study incorporates laser particle size analysis, thin sections and scanning electron microscopy (SEM). Ten representative mudrock samples were collected from outcrops of the Sitakund structure. From the studies, it is evident that mudrocks of Sitakund structure are characteristically silty. The silt content, as estimated by laser grain size analysis, of the mudrocks ranges from 39 to 77% with average of 58%. Significant amount of granular silt with the platy clay minerals is also evident from the SEM micrographs. The silts are mainly quartz, feldspar and micas. The high silt content in the Neogene mudrocks implies an enormous flux of silty sediments with a very high rate of sedimentation allowing little time for a more selective sorting. This supports the geologic history that the uplifting and erosion of Himalaya was at the peak during Miocene and the Ganges mega delta received highest rate of sedimentation and growth rendering shale consistently silty.Bangladesh J. Sci. Res. 30(1&2): 35-43, December-2017

scholarly journals Stabilization of Lateritic Soil Admixed with Maize Husk Ash

2018 ◽  
Vol 1 (March 2018) ◽  
Author(s):  
J.R Oluremi ◽  
K.O Fagbenro ◽  
O.M Osuolale ◽  
A.M Olawale
Keyword(s):  
Construction Materials ◽  
Particle Size Analysis ◽  
Liquid Limit ◽  
Soil Samples ◽  
Grain Size Analysis ◽  
Lateritic Soil ◽  
Size Analysis ◽  
Unconfined Compression Test ◽  
Road Pavement ◽  
Stabilized Soil

Lateritic soil is one of the major construction materials in road pavement. However, obtaining lateritic soil with sufficient strength is difficult, which may necessitate its improvement by stabilization. Lateritic soil, in this study, was stabilized with upto 12% Maize Husk Ash (MHA) by weight of soil samples, with a view of improving its geotechnical properties and assessing it as subbase materials. Classification tests (particle size analysis, specific gravity, Atterbergs limits) and strength index tests (compaction, california bearing ratio (CBR), unconfined compression test (UCS) were performed on both the natural and the MHA-stabilized soil samples. The grain size analysis shows that the percentage passing No. 200 BS sieve was 47.7% for the natural lateritic soil and between 50 and 62.1% for MHA stabilized lateritic soil. The liquid limit, plastic limit and plasticity index are in the range of 61 to 76%, 28 to 53% and 16 to 37% respectively. Also, the maximum dry densities increased, while the optimum water content decreased with increase in the MHA content. The CBR value of the lateritic soil increased with MHA content up till 6% addition of MHA and thereafter decreased, while higher UCS value was obtained up till 3% and then decreased with increasing content of MHA. The results indicated that the MHA stabilized lateritic soil could only be used as subgrade and fill materials.

scholarly journals Structure and Mechanical Properties of the Dueñas Clay Formation (Tertiary Duero Basin, Spain): An Overconsolidated Clay of Lacustrine Origin

2021 ◽  
Vol 11 (24) ◽  
pp. 12021
Author(s):  
José Nespereira ◽  
José Antonio Blanco ◽  
Mercedes Suárez ◽  
Emilia García-Romero ◽  
Mariano Yenes ◽  
...  
Keyword(s):  
Swelling Pressure ◽  
Point Load ◽  
Load Test ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Compression Tests ◽  
Durability Test ◽  
Thin Sections ◽  
Direct Shear Tests ◽  
Clay Formation

The Dueñas Clay Formation is considered an example of a deposit of lacustrine continental origin. It is formed mainly by overconsolidated clays and includes feldspathic arenites, and clayey and silty levels; however, in geotechnical projects it is considered a clay unit and treated as a whole. The structure of each level was assessed in the field, in thin sections, and by SEM in the case of the clayey level. In addition, identification, strength, deformation, and durability tests were undertaken according to the nature of the samples (grain size analysis, Atterberg Limits, point load test, direct shear tests, uniaxial compression tests, swelling pressure, and unidimensional consolidation tests). The durability test was used as a criterion for dividing the levels within the formation according to their behavior as soil or rock. It was observed that the proportion and type of carbonate cementation controls the way in which the material behaves, with sparithic cement increasing the strength. The clay levels are expansive due to the presence of smectite, which also influences their behavior under shear stress. In addition, the massive and laminar structure of the layers caused by the continental conditions, in addition to the processes of post-sedimentation, explain their low compressibility.

scholarly journals A Mottled, Non-Lithified Paleosol in Brazil: Diagnosis by Morphological and Mineralogical Features

Minerals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 616
Author(s):  
Yuri Lopes Zinn ◽  
Camila Fernandes Miranda
Keyword(s):  
Particle Size Analysis ◽  
Size Analysis ◽  
X Ray Diffraction ◽  
Forming Process ◽  
Thin Sections ◽  
Massive Structure ◽  
Granular Microstructure ◽  
Kaolinitic Clay ◽  
Yellow Mottling

The identification of paleosols is difficult when no buried horizons or lithification occur. Here, we described the identification of a possible paleosol, its characterization, and which features supported its positive diagnosis. In a construction site, a vertical cut exposed an unusual red–yellow mottling with massive structure and channels (probably faunal), in contrast with the overlying homogeneous red Oxisol with fine granular structure. A similar but more deferrified section with white–yellow mottling also occurred nearby, and both were sampled as large clods. In thin sections, many oriented clay coatings occur along channel voids, suggesting illuviation, as well as dissolving Fe nodules and Mn coatings along planar and channel voids. X-ray diffraction showed a clay dominated by kaolinite, traces of illite, and absence of gibbsite, again contrasting with the gibsitic-kaolinitic clay of the Oxisol. We confirmed the diagnosis of a Paleoultisol due to the following incompatibilities with the overlying Oxisol: (1) massive, apedal structure, and higher bulk density; (2) clay coatings indicative of illuviation as key soil-forming process; (3) low clay contents in particle-size analysis due to cementation; (4) very low organic carbon consistent with long-term inhumation; and (5) kaolinitic–illitic clay. The unusual granular microstructure of the B horizon of the Oxisol is partly derived from disintegration and desilication of the Paleoultisol.

scholarly journals RECONSTRUCTION OF THE URENGOY FIELD DEPOSITS FORMATION BASED ON THE LITHOLOGY-MINERALOGY AND PARTICLE-SIZE ANALYSIS CHARACTERISTICS

2015 ◽  
pp. 32-40
Author(s):  
A. V. Parshukov ◽  
E. A. Mogutova ◽  
A. A. Nezhdanov
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Oil And Gas ◽  
Structural Features ◽  
Particle Size Analysis ◽  
Gas Condensate ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Material Supply ◽  
Genetic Interpretation

The results of detailed lithology-mineralogy studies and grain-size analysis of deposits from well No. 739 in the oil-and-gas condensate field Urengoy were generalized to investigate a degree of the Achimov deposits sandsilt rocks’ heritance of lithological and structural features of deposits of the shelf detritus material supply sources. This information is very important for reconstruction of the conditions of the Achimov reservoirs formation and for genetic interpretation of the lithology studies data.

scholarly journals Identificação da variação de energia no fluxo de escoamento através da análise granulométrica de perfis de margens fluviais na bacia hidrográfica do rio Pirabeiraba – SC / Identification of energy change in the stream flow by grain (...)

2015 ◽  
Vol 26 (45) ◽  
pp. 224
Author(s):  
Daniela Torrisi ◽  
Monica Kleina ◽  
Bruna Daniela de Araújo Taveira ◽  
Fabiano Antonio de Oliveira ◽  
Juliana Landolfi de Carvalho ◽  
...  
Keyword(s):  
Grain Size ◽  
River Flow ◽  
Particle Size Analysis ◽  
Sediment Dynamics ◽  
Energy Change ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Sediment Grain Size ◽  
Fluvial Dynamics ◽  
Granulometric Analysis

<p>O estudo da dinâmica sedimentar de um canal pode auxiliar na compreensão da evolução da paisagem e no entedimento da dinâmica fluvial em uma bacia hidrográfica. A análise granulométrica dos sedimentos permite uma aproximação inicial ao conhecimento da dinâmica sedimentar e da variação da energia do fluxo no canal. O presente trabalho objetiva identificar a variação de energia do fluxo de escoamento do canal fluvial a partir da comparação das análises granulométricas de dois perfis estratigráficos na bacia hidrográfica do rio Pirabeiraba, SC. A metodologia aplicada foi baseada em análises granulométricas e estatísticas desenvolvidas em amostras coletadas em campo. Os principais resultados obtidos demonstraram que os perfis apresentaram-se muito semelhantes, indicando que, apesar de ocorrerem variações de energia dos fluxos, os perfis se mantiveram equivalentes nas duas amostras estudadas. Desta forma, pode-se relatar que os eventos ocorridos foram homogêneos nesta parte da bacia.</p><p><strong>Palavras-Chave:</strong> Análise granulométrica, Fluxo fluvial, Rio Pirabeiraba.</p><p><strong>Abstract</strong></p><p>The study of sediment dynamics of a river may help to understand the evolution of the landscape and to comprehend the fluvial dynamics in a watershed. One useful tool is the sediment grain size analysis (granulometry / granulometric analysis). The granulometric analysis allows to understand sediment dynamics as well as energy changes in a river flow. This paper aims to identify the energy change of a river channel by means of the comparison of particle size analysis of two stratigraphic profiles in the Pirabeiraba river watershed, Santa Catarina, Brazil. The applied methodology was based on grain size and statistical analysis from the collected samples. The main results show that both profiles are very similar, despite the variations that occurred in the river flows, what means that the fluvial process were uniform in this part of the watershed. <strong> </strong></p><p> </p><p><strong>Keywords:</strong> Grain size analysis, Fluvial flow, Pirabeiraba river.</p>

Assessment of the Aggregate in Historical Plasters

2016 ◽  
Vol 865 ◽  
pp. 162-166
Author(s):  
Petr Rezek ◽  
Petr Martinec
Keyword(s):  
Grain Size ◽  
Optical Microscopy ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Petrographic Analysis ◽  
Assessment Methodology ◽  
Thin Sections ◽  
Fine Aggregates

This article deals with the analysis of the aggregates of historical plasters. In the paper there is described the assessment methodology of the aggregates of historical plasters. The assessment of the aggregates is carried out with the example of a set of original and modern-day aggregates taken in the prelature and convent of the Želiv Monastery. Composition of fine aggregates of historical plasters was compared to the composition of the aggregates from resources of nearby watercourses. As well as it was assessed the geological character of nearby vicinity of the Monastery. For the analysis of character of the plaster fine aggregates it is applied the optical microscopy of the plaster thin sections, grain size analysis, mineralogical and petrographic analysis of the aggregates. The presented results document the differences in the origin of the aggregate used in plasters.

Acyclovir Loaded Solid Lipid Nanoparticle Based Cream: A Novel Drug Delivery System

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
EL- Assal I. A. ◽  
Retnowati .
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Antiviral Agent ◽  
Study Drug ◽  
Particle Size Analysis ◽  
Stability Study ◽  
Size Analysis ◽  
Solid Lipid ◽  
Dermal Delivery

Objective of the present investigation was enthused by the possibility to develop solid lipid nanoparticles (SLNs) of hydrophilic drug acyclovir. Also study vitro and vivo drug delivery. Methods: Drug loaded SLNs (ACV-SLNs) were prepared by high pressure homogenization of aqueous surfactant solutions containing the drug-loaded lipids in the melted or in the solid state with formula optimization study (Different lipid concentration, drug loaded, homogenization / stirring speed and compritol 888ATO: drug ratio). ACV - SLN incorporated in cream base. The pH was evaluated and rheological study. Drug release was evaluated and compared with simple cream- drug, ACV – SLN with compritol 888ATO and marketed cream. The potential of SLN as the carrier for dermal delivery was studied. Results: Particle size analysis of SLNs prove small, smooth, spherical shape particle ranged from 150 to 200 nm for unloaded and from 330 to 444 nm for ACV loaded particles. The EE% for optimal formula is 72% with suitable pH for skin application. Rheological behavior is shear thinning and thixotropic. Release study proved controlled drug release for SLNs especially in formula containing compritol88 ATO. Stability study emphasized an insignificant change in SLNs properties over 6 month. In-vivo study showed significantly higher accumulation of ACV in stratum corneum, dermal layer, and receptor compartment compared with blank skin. Conclusion: AVC-loaded SLNs might be beneficial in controlling drug release, stable and improving dermal delivery of antiviral agent(s).

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