9 results on '"extraction test"'
Search Results
2. Comparative Evaluation of the Engineering Properties of Asphaltic Concrete from Selected Asphalt Plants in Southwestern Nigeria for Road Construction
- Abstract
In this study, the engineering properties of asphaltic concrete from selected asphalt plants in Southwestern Nigeria for road construction were sampled for three months, analysed and compared with regulatory body specifications. The penetration test, Ductility test, Marshall Stability and flow tests results indicated good conformity to the regulatory specification by all the plants with JBN exhibiting highest range value while LSPWC has the least. Also, asphalt samples from all the plants passed the Ring ball and softening point test with Julius Berger Nigeria having highest value between 53.5-53.7 while SEQUOIA has the least with 50-50.2 when compared to standard value 47-56. For bitumen content tests with 5-8% Specification, ESPRO failed with 3.9-4.8, LSPWC show inconsistence result of 3.9-5.6, SEQUOIA had the highest between 6.4-7.0, while CCECC and JBN conform to specification. The density-void ratio and particle size specification were met by only JBN with major deviation recorded from LSPWC. The result indicated JBN is the only company that satisfy all the engineering properties specification while others exhibit inconsistency in aggregates proportion thereby making the asphalt concrete a possible cause for pavement failure in Southwest Nigeria.
- Published
- 2023
3. Comparative Evaluation of the Engineering Properties of Asphaltic Concrete from Selected Asphalt Plants in Southwestern Nigeria for Road Construction
- Abstract
In this study, the engineering properties of asphaltic concrete from selected asphalt plants in Southwestern Nigeria for road construction were sampled for three months, analysed and compared with regulatory body specifications. The penetration test, Ductility test, Marshall Stability and flow tests results indicated good conformity to the regulatory specification by all the plants with JBN exhibiting highest range value while LSPWC has the least. Also, asphalt samples from all the plants passed the Ring ball and softening point test with Julius Berger Nigeria having highest value between 53.5-53.7 while SEQUOIA has the least with 50-50.2 when compared to standard value 47-56. For bitumen content tests with 5-8% Specification, ESPRO failed with 3.9-4.8, LSPWC show inconsistence result of 3.9-5.6, SEQUOIA had the highest between 6.4-7.0, while CCECC and JBN conform to specification. The density-void ratio and particle size specification were met by only JBN with major deviation recorded from LSPWC. The result indicated JBN is the only company that satisfy all the engineering properties specification while others exhibit inconsistency in aggregates proportion thereby making the asphalt concrete a possible cause for pavement failure in Southwest Nigeria.
- Published
- 2023
4. Typological analysis of slidequakes emitted from landslides: experiments on an expander body pile and Sobradinho landslide (Brasilia, Brazil).
- Author
-
Hussain, Yawar, Hussain, Sehar M., Martino, Salvatore, Cardenas-Soto, Martin, Hamza, Omar, Rodriguez-Rebolledo, Juan F., Uagoda, Rogério, and Martinez-Carvajal, Hernan
- Subjects
- *
LANDSLIDES , *EMISSIONS (Air pollution) , *SOILS , *BED load , *SLOPES (Physical geography) - Abstract
Reactivation of a landslide is usually accompanied by microseismic signals emitted from the deforming soil mass. The reproduction of similar signals in a physical model test conducted under control conditions can allow researchers to explore and test such complicated signals to improve the prediction of full-scale failure. The present study investigates the similarity between the slidequakes (microseismicity) naturally emitted from an existing colluvial landslide (Sobradinho, Brazil) in response to rainfalls and the emissions generated by a pullout test of an expander body (EB) pile in tropical soil under controlled conditions. The microseismic signals emitted from both experimental sites (i.e. the landslide and the EB pile test) were recorded and compared. Data were acquired by mini-arrays of four short-period seismometers. For the signal nomenclature, a typological scheme was adopted, in which sonograms/spectral contents of the signals were used. As a result, short duration microseismic signals were observed during the pullout test. In contrast, at the Sobradinho landslide, the testing detected signals of different characteristics whose source mechanisms have remained ambiguous, mainly because of the short duration of the data campaigns. However, at the landslide, propagating events were observed that might be attributed to the energies generated by the river bedload during the heavy rains. The present study offers some insight into the pre-collapse dynamic behavior of unstable slopes in clayey formations. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
5. Coca-Cola® for Determining Bioaccessible Uranium in Contaminated Mine Soils
- Author
-
Lottermoser, Bernd, Schnug, Ewald, Haneklaus, Silvia, deblik, Berlin, Merkel, Broder, editor, and Schipek, Mandy, editor
- Published
- 2012
- Full Text
- View/download PDF
6. TINJAUAN UMUR RENCANA JALAN PADA TAHUN KE 3 TERHADAP PENURUNAN KINERJA JALAN
- Author
-
Adzuha Desmi, Herman Fithra, and Irvan Arief
- Subjects
Transport engineering ,extraction test ,lcsh:TA1-2040 ,Road surface ,Environmental science ,core drill ,marshall test ,asphalt level ,lcsh:Engineering (General). Civil engineering (General) ,Transportation infrastructure ,Core drill ,performance - Abstract
Highway is a land transportation infrastructure that forms a transportation network to connect an area to other regions, so that the wheels of the economy and development can rotate well. This research was based on the road age of the third year of the road Krueng Geukueh - Beureughang, so the researchers wanted to know what factors were the causes of performance degradation on the road and the relationship between the decline in road performance on the material used. In this study includes 3 stages, namely, Core drill, Marshall Test testing and testing of Test Extracts that have been achieved using 8 (Eight) samples. So it can be concluded that there has been a decrease in asphalt levels on the road resulting in damage and decreased performance on the road. Coupled with increased charges within 3 (three) years, therefore repairs to the road are needed. From this research, it is expected to be able to provide input to improve the quality of the material and the layer of road surface pavement. Keywords : Decreasing Road Performance, Core Drill, Marshall Test, Test Extract, Asphalt Level.
- Published
- 2020
7. DEVELOPMENT OF A ROLLER-BELT EXTRACTOR FOR CHOP-HARVESTED SWEET SORGHUM.
- Author
-
Sun, X. Z., Yamana, N., Dohi, M., and Nakata, N.
- Subjects
- *
SORGO , *EXTRACTION (Chemistry) , *SILAGE , *RENEWABLE energy sources , *BAGASSE - Abstract
Sweet sorghum has the potential to be used as a renewable energy crop, but its short harvest period, poor storability, and higher transportation costs have prevented it from being utilized. It is possible to chop-harvest sweet sorghum, extract the juice, ferment the juice to ethanol, and ensile bagasse as fodder. A suitable extractor is the key component for implementing this method. Thus, a roller-belt extractor suitable for chop-harvested sweet sorghum was designed and built. Extraction tests were conducted using an orthogonal design in order to determine the optimum parameters of the extractor The extraction ratio (juice mass to input mass) of the developed extractor increased with reduced cut length, decreased drive roller speed, and increased feed rate. The mean extraction ratio was 19. 7% ±1.1% (mean ±SD) when the theoretical cut length was set to 17 mm, the drive roller speed to 6.3 rpm, and the feed rate to 1000 kg h-1 (optimum parameters). In addition, bagasse and chopped plants were ensiled in airproof drums for 70 days as fodder. The compositions of chopped plants and bagasse, chopped-plant silage, and bagasse silage of sweet sorghum were compared. Results indicated that the NO3-N comer, t of bagasse silage was less than that of chopped-plant silage, implying that juice extraction improved the quality of sweet sorghum silage. These results will help in optimizing the sweet sorghum utilization system and promote the use of sweet sorghum. [ABSTRACT FROM AUTHOR]
- Published
- 2010
- Full Text
- View/download PDF
8. Typological analysis of slidequakes emitted from landslides : experiments on an expander body pile and Sobradinho landslide (Brasilia, Brazil)
- Author
-
Rogério Uagoda, Yawar Hussain, Salvatore Martino, Martín Cárdenas-Soto, Omar Hamza, Sehar M. Hussain, Juan Rodriguez-Rebolledo, and Hernan Martinez-Carvajal
- Subjects
lcsh:TN1-997 ,extraction test ,General Engineering ,Foundation (engineering) ,Argila ,Landslide ,expander body pile ,spectral analysis ,Deslizamento (Geologia) ,lcsh:TA1-2040 ,tropical clay ,Forensic engineering ,General Earth and Planetary Sciences ,Spectral analysis ,sonograms ,Teste de extração ,lcsh:Engineering (General). Civil engineering (General) ,Pile ,Análise espectral ,lcsh:Mining engineering. Metallurgy ,Geology ,General Environmental Science - Abstract
Reactivation of a landslide is usually accompanied by microseismic signals emitted from the deforming soil mass. The reproduction of similar signals in a physical model test conducted under control conditions can allow researchers to explore and test such complicated signals to improve the prediction of full-scale failure. The present study investigates the similarity between the slidequakes (microseismicity) naturally emitted from an existing colluvial landslide (Sobradinho, Brazil) in response to rainfalls and the emissions generated by a pullout test of an expander body (EB) pile in tropical soil under controlled conditions. The microseismic signals emitted from both experimental sites (i.e. the landslide and the EB pile test) were recorded and compared. Data were acquired by mini-arrays of four short-period seismometers. For the signal nomenclature, a typological scheme was adopted, in which sonograms/spectral contents of the signals were used. As a result, short duration microseismic signals were observed during the pullout test. In contrast, at the Sobradinho landslide, the testing detected signals of different characteristics whose source mechanisms have remained ambiguous, mainly because of the short duration of the data campaigns. However, at the landslide, propagating events were observed that might be attributed to the energies generated by the river bedload during the heavy rains. The present study offers some insight into the pre-collapse dynamic behavior of unstable slopes in clayey formations.
- Published
- 2019
9. New insights on mobility and bioavailability of heavy metals in soils of the Padanian alluvial plain (Ferrara Province, northern Italy)
- Author
-
Dario Di Giuseppe, Livia Vittori Antisari, Gianluca Bianchini, Chiara Ferronato, Dario Di Giuseppe, Livia Vittori Antisari, Chiara Ferronato, and Gianluca Bianchini
- Subjects
extraction test ,SOIL ,Padanian Plain ,heavy metals ,Extraction test ,Phytoavailability ,Food chain ,Mineralogy ,Structural basin ,Contamination ,heavy metal ,Alluvial plain ,Bioavailability ,soil ,chemistry.chemical_compound ,Geophysics ,chemistry ,food chain ,Geochemistry and Petrology ,Environmental chemistry ,Soil water ,Aqua regia ,Alluvium ,Geology ,phytoavailabity - Abstract
Heavy metals having both natural and anthropogenic origin are common contaminants in soils and sediments, and can be transferred and bioaccumulated at all levels of the food chain, posing serious environmental concern to the local population. In this paper, agricultural soils from the Province of Ferrara (easternmost part of the Padanian Plain, northern Italy) were investigated to assess the levels of potentially toxic metals in relation to their phytoavailability. Agricultural soils have been sampled in order to identify the origin, mobility and bioavailability of heavy metals, collecting superficial and deeper (depths of 20–30 and 100–120 cm, respectively) horizons. The “total” XRF analyses properly elaborated with a statistical approach reveal that soils evolved from two distinct types of alluvial sediments, in turn related to the Po and Reno rivers; the former type is distinctively enriched in heavy metals (particularly Cr and Ni), reflecting the presence of femic and ultrafemic rocks in the hydrological basin of River Po. The absence of Top Enrichment Factors for Ni, Co, Cr, V, and Pb suggests that the content of these elements is natural and unaffected by contamination, whereas superficial enrichments of Cu (and Zn) is ascribed to anthropogenic inputs related to agricultural activities. Multiple extraction tests using variously aggressive reactants (aqua regia, DTPA, EDTA, NH4NO3, and H2O) analyzed by ICP gave insights on the specific mobility of the distinct elements, which decreases in the following order: Pb > Cu > Cd > Co > >Ni > Cr. Taking into consideration the elements that are inducing the main concerns, Cr appears scarcely mobile, whereas Ni could be more phytoavailable and has to be monitored in the local agricultural products. Cd although scarcely abundant has to be monitored for its mobility and toxicity, whereas Cu although abundant and extremely mobile doesn’t induce concerns as it is not hazardous for the living receptors.
- Published
- 2014
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.