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Wyświetlanie 1-2 z 2
Tytuł:
Optimization of concrete made with abakaliki quarry dust as fine aggregate using Scheffe’s optimization Model
Autorzy:
Chiemela, C.
Okoye, P.C.
Nwosu, P.C.
Oke, O.M.
Ohakwe, C.N.
Powiązania:
https://bibliotekanauki.pl/articles/11178.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
In recent years, Nigeria has witness rapid development especially in the area of infrastructural development like roads, bridges, buildings etc. The conventional methods used in concrete mixing have its own peculiar problems, like time wasting, material wasting and errors. These problems have been the cause of structural failures which has given rise to loss of life and properties. Hence the need to development a method that will take care of all these anomalies witness in the conventional method. This work is aim at removing these anomalies by the use of Scheffes optimization method. This optimization method can predict the compressive strength of a concrete given the mix ratios and also predict the mix ratios required to give a compressive strength for a particular concrete made by completely replacing river sand with quarry dust. With this method it will be easy to predict the compressive strength of concrete based on the type of structure it is to be used for, there by eliminating the problems associated with structural collapse due to errors in concrete mixing by conventional method.
Źródło:
International Letters of Natural Sciences; 2014, 15, 2
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
1D resistivity inversion technique in the mapping of igneous intrusives; a step to sustainable quarry development
Autorzy:
Nwachukwu, M. A.
Nwosu, L. I.
Uzoije, P. A.
Nwoko, C. A.
Powiązania:
https://bibliotekanauki.pl/articles/970687.pdf
Data publikacji:
2017
Wydawca:
Główny Instytut Górnictwa
Tematy:
geo-electric
diabase
trial pit
land degradation
sustainability
Benue trough
diabaz
szyb badawczy
degradacja gruntu
rozwój zrównoważony
koryto Benue
Opis:
The use of trial pits as a first step in quarry site development causes land degradation and results in more failure than success for potential quarry investors in some parts of the world. In this paper, resistivity, depth and distance values derived from 26 Vertical Electric Soundings (VES) and 2 profiling inversion sections were successfully used to evaluate a quarry site prior to development. The target rock Diabase (Dolerite) was observed and it had a resistivity range of 3.0 x 10⁴ - 7. 8 x 10⁶ Ω-m, and was clearly distinguishable from associated rocks with its bright red color code on the AGI 1D inversion software. This target rock was overlain by quartzite, indurate shale and mudstone as overburden materials. The quartzite, with its off-red colour, has a resistivity range of 2.0 x 10³-2.9 x 10⁵ Ω-m, while the indurate shale, with a yellowish-brown colour, showed resistivity values ranging from 6.1 x 10² - 2.8 x 10⁵ Ω-m. Topsoil was clayey, with a resistivity range from 8 - 8.6 x 10²u Ω-m and depths of 0.3-1.8 m, often weathered and replaced by associated rocks outcrops. The diabase rock, in the three prospective pits mapped, showed thicknesses of between 40 and 76 m across the site. The prospective pits were identified to accommodate an estimated 2,569,450 tonnes of diabase with an average quarry pit depth of 50 m. This figure was justified by physical observations made at a nearby quarry pit and from test holes. Communities were able to prepare a geophysical appraisal of the intrusive body in their domain for economic planning and sustainability of the natural resource.
Źródło:
Journal of Sustainable Mining; 2017, 16, 4; 127-138
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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