Feasibility assessment of bulk density property of carbon nano tube as a viable alternative to reinforcement steel in construction projects

Mathematical Modeling of the Bulk Density Property of Knitted Fabrics

Engineering ◽

10.4236/eng.2022.141003 ◽

2022 ◽

Vol 14 (01) ◽

pp. 33-42

Author(s):

Iroda Ibrohimovna Kamalova ◽

Baxtiyor Farruxovich Mirusmanov ◽

Juramirza Abdiramatovich Kayumov ◽

Axtam Akramovich Qosimov ◽

Muborak Nosir Qizi Yusupova

Keyword(s):

Mathematical Modeling ◽

Bulk Density ◽

Density Property ◽

Knitted Fabrics

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Feasibility Assessment of Tilt-Up Construction in Commercial Buildings

Journal of Engineering Project and Production Management ◽

10.2478/jeppm-2020-0016 ◽

2020 ◽

Vol 10 (2) ◽

pp. 141-146

Author(s):

Chipozya Tembo Silungwe ◽

Festus C. Luwaya

Keyword(s):

Construction Projects ◽

Simple Random Sampling ◽

Commercial Building ◽

Building Sector ◽

Concrete Walls ◽

Cost Overruns ◽

Feasibility Assessment ◽

Reinforced Concrete Walls ◽

Concrete Blocks ◽

Building Walls

AbstractConstruction projects are much appreciated by both client and contractor when completed on schedule and within budget so as to avoid cost overruns. The Zambian building sector normally experiences time and cost overruns. This study investigated the feasibility of using tilt-up construction in the construction of commercial building walls. The methodology used consisted of a literature review, a questionnaire survey and a scenario analysis consisting of a hypothetical 4900 square meter commercial building with a height of 8 meters. Sixty-six questionnaires were administered to design professionals operating in the Zambian building sector using simple random sampling and thirty-six were returned giving a response rate of 55%. The data were analyzed using descriptive statistics. Cost analysis was done on a hypothetical building as no contractor was found using tilt-up construction in the construction sector. The study established that tilt-up was, in fact, more expensive than the conventional methods (concrete blocks and in-situ reinforced concrete walls), but it was faster, hence, making it viable in respect to time and not cost in the Zambian construction industry (ZCI). Additionally, necessary expertise was available with the exception of a certified tilt-up practitioner and a sealant sub-contractor in cases where a sealant contractor is needed. The study has identified that currently in the Zambian building sector tilt-up construction can be used when time is more important than the cost. However, challenges such as site size (limited space), the unavailability of building regulation for tilt-up construction and the economic capacity of the client or capacity need to be addressed for enhancing the practical application of tilt-up construction in ZCI.

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Densidade aparente média de resíduos sólidos coletados em uma obra portuária

Revista Meio Ambiente e Sustentabilidade ◽

10.22292/mas.v9i19.933 ◽

2020 ◽

Vol 9 (19) ◽

Author(s):

André Nagalli ◽

Paulo Roberto Geraldo Filho ◽

Natália Smaniotto Bach

Keyword(s):

Solid Waste ◽

Bulk Density ◽

Construction Projects ◽

Measurement Scale ◽

Waste Generation ◽

Class A ◽

Management Actions ◽

Palabras Clave ◽

Solid Waste Generation ◽

Port Construction

Resumo As taxas de geração de resíduos sólidos na construção civil são variáveis e dependentes de diversos fatores. Obras de grande porte têm características distintas; desta forma, é importante dispor de indicadores de geração de resíduos para ações de planejamento e gestão. Neste trabalho, investigaram-se as densidades aparentes de alguns tipos de resíduos sólidos gerados em uma obra de construção portuária no município de Paranaguá, Paraná. Utilizou-se a pesagem das caçambas estacionárias como forma de aquisição de dados. Os resultados revelaram densidade aparente média variável por tipo de material: 0,605 t/m³ para resíduos classe A (Conama 307/02); 0,307 t/m³ para sucata de madeira; 0,696 t/m³ para sucata metálica; 0,132 t/m³ para rejeitos classe IIA; 0,083 t/m³ para sucata de papel e 0,087 t/m³ para sucata plástica. Observou-se que a escala de medição — caçamba estacionária versus bombona plástica — interfere diretamente nos resultados. Apesar das especificidades das grandes obras, conclui-se que os indicadores obtidos podem ser aplicados nesse tipo de empreendimento. Esses indicadores são, dessa forma, mais adequados do que os disponíveis atualmente na literatura. Palavras-chave: Densidade aparente média. Resíduos sólidos. Construção civil. Abstract The rates of solid waste generation in civil construction are variable and dependent on several factors. Large works have distinct characteristics; thus, it is interesting to have indicators of waste generation for planning and management actions. In this work, we investigated the apparent densities of some types of solid waste generated in a port construction project in the municipality of Paranaguá, Paraná. The weighing of stationary buckets was used as a form of data acquisition. The results revealed average bulk density by material type: 0.605 t/m³ for class A residues (Conama 307/02); 0.307 t/m³ for scrap wood; 0.696 t/m³ for scrap metal; 0.132 t/m³ for class IIA tailings; 0.083 t/m³ for scrap paper and 0.087 t/m³ for plastic scrap. It was observed that the measurement scale — stationary bucket versus plastic barrel — directly interferes with the results. It is concluded that, despite the particularities of the great works, the indicators obtained can be applied in large construction projects. These indicators are, therefore, more appropriate than those currently available in the literature. Keywords: Average bulk density. Solid waste. Civil construction. Resumen Las tasas de generación de residuos sólidos en la construcción civil son variables y dependen de diversos factores. Las obras de grande porte tienen características distintas; por ello, es importante disponer de indicadores de producción de residuos para acciones de planificación y gestión. En este trabajo se estudiaron las densidades aparentes de algunos tipos de residuos sólidos producidos en una obra de construcción portuaria en el municipio de Paranaguá, en el estado de Paraná. Se estudió el peso de los contenedores de escombros como forma de recolección de datos. Los resultados revelaron densidad aparente promedio variable, de acuerdo con el tipo de material: 0,605 t/m3 para residuos clase A (Conama 307/02); 0,307 t/m3 para residuos de madera; 0,696 t/m³ para residuos metálicos; 0,132 t/m³ para residuos clase IIA; 0,083 t/m³ para residuos de papel y 0,087 t/m³ para residuos plásticos. Se pudo observar que la escala de medición — contenedores de escombros versus cubos de basura plásticos — interfiere directamente en los resultados. A pesar de las especificidades de las grandes obras, se concluye que los indicadores obtenidos pueden ser aplicados en ese tipo de desarrollo. De esa manera, esos indicadores son más adecuados que los disponibles actualmente en la literatura. Palabras-clave: Densidad aparente promedio. Residuos sólidos. Construcción civil.

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An application of ground penetrating radar to peat stratigraphy of Ellice Swamp, southwestern Ontario

Canadian Journal of Earth Sciences ◽

10.1139/e90-096 ◽

1990 ◽

Vol 27 (7) ◽

pp. 932-938 ◽

Cited By ~ 47

Author(s):

Barry G. Warner ◽

David C. Nobes ◽

Brian D. Theimer

Keyword(s):

Moisture Content ◽

Physical Properties ◽

Bulk Density ◽

Ground Penetrating Radar ◽

Viable Alternative ◽

Ground Penetrating ◽

Peat Stratigraphy

Ground penetrating radar (GPR) has been applied to the mapping of stratigraphy and peat thickness of a large bog in southwestern Ontario. The GPR survey was undertaken in conjunction with a conventional coring survey and measurement of peat physical properties. The results indicate that GPR responds to peat moisture content and bulk density, which vary with stratigraphic changes. In particular, the acrotelm–catotelm boundary and the basal clay are GPR reflectors. The presence of gyttja above the clay is indicated by complex basal reflections. Ground penetrating radar is a viable alternative to an intensive coring survey for evaluating peat depth and extent.

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