Zobrazeno 1 - 10
of 39
pro vyhledávání: '"David O. Nduka"'
Publikováno v:
Materials, Vol 16, Iss 22, p 7149 (2023)
Rapid urbanisation causes a rise in the need for infrastructure, which in turn fuels the creation of additional concrete and further increases cement supplies. Activation of illite-based clay mineral and usage in concrete production is one of the sus
Externí odkaz:
https://doaj.org/article/b8b7491c7acd44f9a9bbbeeb72ee241a
Publikováno v:
Cleaner Engineering and Technology, Vol 11, Iss , Pp 100583- (2022)
This research characterises bamboo leaf ash (BLA), which was obtained by calcining dry bamboo leaves at approximately 600 °C for 2 h in a laboratory-controlled muffle furnace. To understand the pozzolanic potentials of the BLA, X-ray fluorescence (X
Externí odkaz:
https://doaj.org/article/17f589eb1aa346cbaf81260fe3136e43
Publikováno v:
Heliyon, Vol 8, Iss 9, Pp e10502- (2022)
An experimental study was carried out to determine the properties of rice husk ash (RHA) and its effect on high-performance concrete's (HPC) mechanical and microstructural properties. RHA content was placed at 0–30% at 5% step intervals and a const
Externí odkaz:
https://doaj.org/article/b35ad61571f24355b5e3f60f7b5561a0
Publikováno v:
Materials, Vol 16, Iss 6, p 2471 (2023)
In order to study the mechanical and microstructural properties of masonry mortar, combined particles of cockle and scallop seashell wastes were incorporated and analysed through destructive and non-destructive tests. River sand was replaced with the
Externí odkaz:
https://doaj.org/article/0bae5a1c8eec4cb3ac8d6dd97679bcbb
Autor:
David O. Nduka, Kehinde D. Oyeyemi, Oluwarotimi M. Olofinnade, Anthony N. Ede, Chimwhurumnanya Worgwu
Publikováno v:
Cogent Social Sciences, Vol 7, Iss 1 (2021)
An improved indoor environmental quality (IEQ) is a major determinant of human comfort in an occupied space. The current cross-sectional study investigates the link between indoor environmental quality (IEQ) and sick building syndrome symptoms (SBS)
Externí odkaz:
https://doaj.org/article/ada3e4811ed946eb9a9855004c00997e
Autor:
Opeyemi Joshua, Kolapo O. Olusola, David O. Nduka, Anthony N. Ede, Oluwarotimi M. Olofinnade, Olorunmeye F. Job
Publikováno v:
MethodsX, Vol 7, Iss , Pp 100817- (2020)
• Concrete production process is usually designed to meet certain fresh properties, target strength and durability requirement. This process is referred to as the mix design, which guides the quantity and proportions of the various constituent mate
Externí odkaz:
https://doaj.org/article/5215b4774b98404dac9fc51256f164d6
Autor:
Anthony N. Ede, Oluwarotimi M. Olofinnade, Opeyemi Joshua, David O. Nduka, Obatarhie A. Oshogbunu
Publikováno v:
Cogent Engineering, Vol 7, Iss 1 (2020)
This paper examines the effect of combined bamboo fibers and limestone powder used as filler material on the fresh, hardened and microstructural properties of self-compacting concrete (SCC). The bamboo fibers of aspect ratio (l/d) of 50 and a maximum
Externí odkaz:
https://doaj.org/article/fcef1b0a4e724392be996ccde73baee1
Publikováno v:
Gels, Vol 8, Iss 2, p 85 (2022)
Supplementary cementitious materials (SCMs) have been widely used to enhance both the microscopic and macroscopic properties of the Portland cement (PC)–SCM composite matrix. Few studies have been undertaken to establish the gel/space ratio of meta
Externí odkaz:
https://doaj.org/article/657a25b57af244efbd35a5ba31bbb2d0
Publikováno v:
Crystals, Vol 12, Iss 1, p 75 (2022)
The present study examines the durability properties of Class 1 (50–75 MPa) high-performance concrete (HPC) blended with rice husk ash (RHA) as a partial replacement of CEM II B-L, 42.5 N. Six HPC mixes were prepared with RHA and used as 5%, 10%, 1
Externí odkaz:
https://doaj.org/article/488089318c724aac926e6326f7ce3041
Autor:
Ayodeji O. Ogunde, Rachael Ayodele, Opeyemi Joshua, David O. Nduka, Abisola Ogunde, Kunle E. Ogundipe, Babatunde F. Ogunbayo, Adekunle M. Ajao
Publikováno v:
Data in Brief, Vol 18, Iss , Pp 1394-1399 (2018)
The data article provides the factors that influence the cost; time performance of the Industrialized Building System (IBS), its prospects and challenges. A survey technique was used for this research. Structured Questionnaires were administered to o
Externí odkaz:
https://doaj.org/article/5abd6a74850945939adb66f33c9b950e