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Defects in Concrete Elements: A Study of Residential buildings of 30 Years and above in Onitsha Metropolis, Anambra State, Nigeria

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Journal of building Construction and Planning Research 2022年第3期10卷 102-123页

作者： Chiamaka Ogochukwu Obiora Fidelis Okechukwu Ezeokoli Chritopher Chidi Belonwu Francisca Nkachukwu Okeke Department of building Nnamdi Azikiwe University Awka Anambra State Nigeria Department of building Niger Delta University Wilberforce Island Amasoma Bayelsa State Nigeria Department of Quantity Surveying Enugu State University of Science and Technology Agbani Enugu State Nigeria

building defect is an issue in existing buildings that needs urgent tackling to prevent further problems. This study assessed the defects in concrete elements in residential buildings of 30 years and above in the Onitsha metropolis of Anambra State, Nigeria. Data collection instruments in the study include structured questionnaire, interviews, visual inspection/observations, archival records, recordings, photographs;and non-destructive testing of the concrete elements in an existing building in the study area. The population of this study constituted of the construction registered professionals and the existing buildings in study area. The sample for the study was based on the calculated sample size using Taro Yamani Formula. A total of 158 registered professionals were sampled from the population of 260. The questionnaires were purposively distributed to the registered professionals up to the required sample sizes of 158 and 129 questionnaires were properly filled and returned. The study used the SPSS and Microsoft Excel to analyze the data. The results were analyzed in percentages and figures using descriptive statistics and presented in the form of pie charts and tables. The finding of the study revealed that the causes and effects of structural defects on the concrete elements in existing buildings in the study area according to the rating are;exposed/corrosion of the embedded metals, faulty workmanship, overload and impacts, chemical attack, freeze-thaw deterioration, fire/heat, restraint to volume change. The visual observation revealed that the structural elements are characterized by heavy defects such as deep vertical, horizontal and diagonal cracks, exposed/ corrosion of the embedded metals, spalling of the concrete slabs. The existence of defects in the concrete members led to the low compressive strength of the concrete elements and the structural instability of the existing buildings as revealed by the non-destructive test. The non-destructive test resu

关键词： Construction Industry building professionals Concrete Elements Defects Residential buildings Structural Stability Non-Destructive Test Compressive Strength

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A study on the construction of interior architecture in Hankou

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International Journal of Technology Management 2017年第2期 4-6页

作者： Xiaoqian Yang Zhi Xing College Of Hu Bei University Wuhan P.R.China 430000

In this article, we set out from the library practical application, combined with the design of the built environment of space, lighting, color and other basic elements, build a library building to explore the internal environment. Application by building Environment and Energy Engineering Practice teaching profession as well as social needs of research, combined with the professional status of teaching practice, Jiangsu University, discusses the necessity to build a new practice teaching system. In the student-oriented, systematic principles and openness from the three aspects of the practice of teaching objectives, practical teaching, practice teaching management and examination and evaluation systems of practical teaching system reform, to make the practice of teaching students to become ability , the real meaning of the ability to solve practical problems and innovative spirit are re？ ected, for training for the development needs of the times by the employers and quali＇ ed personnel create the conditions. Entering the new century, sustainable development has become a more serious topic in the world, in order to more effectively control and use of our environmental resources, many countries have formulated relevant building environmental assessment system.

关键词： sustainable development environment Construction building components evaluation system building professionals

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