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Doctoral Degrees (Construction Management)

Permanent URI for this collectionhttps://hdl.handle.net/10413/13213

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Browsing Doctoral Degrees (Construction Management) by Subject "Confirmatory factor analysis."

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    Improved water infrastructure delivery and management model.
    (2020) Nkwonta, Onyeka Ifeanyi.; Haupt, Theodore Conrad.
    ENGLISH ABSTRACT: Water plays a vital role in poverty reduction, economic growth, business competitiveness and enhancement of societal living in developing countries in particular. Provision of infrastructure involves a complex process and utilizes considerable amount of resources including construction materials, energy, finance and time. Infrastructures have long life span and they could create long-term impact on the environment and society. To achieve efficient and equitable economic growth of economy is an important way of managing water. Better access to sanitation services, clean water and water management creates tremendous strategy for economic growth of any country. There is a close link between water and economic growth of country. Water Mangement brings more efficiency and certainty in productivity across the health of nation and contributes to economic. Water is a critical part of most environmental services on which our ecosystems depend. Water requires optimal management to control competition for use due to population growth and scarcity, climate change, increasing demand and declining water supplies. This research has attempted to develop a model for improving the delivery of water services in developing countries such as South Africa. The model lays a foundation for development of appropriate policies, regulations and procedures to improve water service delivery at EThekwini municipality. A triangulation approach was employed to develop the model using Delphi method and a structured questionnaire survey. The Delphi study involved three rounds with ten experts participating in all rounds until consensus was achieved. After the Delphi study, a conceptual model was developed and validated using data collected from experienced professionals that deals with water infrastructures at EThekwini metro. The data collection was based on convenience sampling where 306 questionnaire were distributed and 210 complete responses were received. Exploratory factor analysis (EFA) using Statistical Package for the Social Sciences (SPSS) and Maximum Likelihood with Promax rotation were used to determine the validity and reliability of the nine constructs of the conceptual model. Confirmatory factor analysis (CFA) was conducted using AMOS, software program to further test validity and reliability of constructs. The findings revealed that the structural model data was acceptable and eight out of eight hypotheses tested were significant. The findings of this research indicates that stakeholders in Civil Engineering and construction industry have to improve their delivery practice in order to deliver good water services in the context of developing countries such as South Africa and also the work has contributed to the evolving current body of knowledge in the area of Water management and delivery. ISIZULU ABSTRACT: Amanzi adlala indima ebalulekile ekwehliseni ubuphofu, ukukhula komnotho, ukuncintisana kwamabhizinisi kanye nokwenza ngcono impilo yomphakathi emazweni asathuthuka ikakhulukazi. Ukuhlinzekwa kwengqalasizinda kubandakanya inqubo eyinkimbinkimbi futhi kusebenzisa inani elikhulu lezinsizakusebenza kubandakanya izinto zokwakha, amandla, ezezimali kanye nesikhathi. Ingqalasizinda inesikhathi eside sokuphila futhi ingadala umthelela wesikhathi eside emvelweni nasemphakathini. Ukuphatha amanzi njengenzuzo yezomnotho kuyindlela ebalulekile yokuthola ukukhula komnotho okusebenzayo futhi okulinganayo. Ukutholakala okungcono kwamanzi ahlanzekile, izinsizakalo zokuthuthwa kwendle nokuphathwa kwamanzi kudala isu elikhulu lokukhula komnotho wezwe. Kukhona ukuxhumana okusondele phakathi kwamanzi nokukhula komnotho wezwe. Ukuphathwa kahle kwezinsizakusebenza zamanzi kuletha ukuqiniseka okuthe xaxa nokusebenza kahle komkhiqizo kuyo yonke imikhakha yezomnotho futhi kuneqhaza empilweni yesizwe. Amanzi ayingxenye ebalulekile yezinsizakalo eziningi zemvelo lapho imvelo yethu incike khona. Amanzi adinga ukuphathwa okuphelele ukulawula ukushoda nokuncintisana kokusetshenziswa ngenxa yokwanda kwabantu, ukwanda kwesidingo, ukuguquka kwesimo sezulu kanye nokwehla kokuphakelwa kwamanzi. Lolu cwaningo luzame ukusungula imodeli yokwenza ngcono ukulethwa kwezinsizakalo zamanzi emazweni asathuthuka njengeNingizimu Afrika. Le modeli ibeka isisekelo sokwakhiwa kwezinqubomgomo, imithethonqubo kanye nezinqubo ezifanele zokuthuthukisa ukulethwa kwezidingo kumasipala weTheku. Kwasetshenziswa indlela yoonxantathu ukuthuthukisa imodeli kusetshenziswa indlela yeDelphi kanye nocwaningo lwemibuzo oluhleliwe. Ucwaningo lweDelphi lubandakanye imizuliswano emithathu nochwepheshe abayishumi ababambe iqhaza kuyo yonke imizuliswano kuze kutholakale ukuvumelana. Ngemuva kocwaningo lwaseDelphi, kwasungulwa imodeli yokuqagela yaqinisekiswa ngokusebenzisa imininingwane eqoqwe kochwepheshe abanolwazi ababhekene nengqalasizinda yamanzi kuMasipala weTheku. Ukuqoqwa kwedatha kwakususelwa kusampula elula kwakukhona imibuzo yemibuzo engama-306 nokusatshalaliswa izimpendulo eziphelele ezingama-210. Ukuhlaziywa kwesici sokuhlola (i-EFA) kusetshenziswa inguqulo ye- Statistical Package yeSayensi Yezenhlalakahle (SPSS) kusetshenziswa Ubukhulu obukhulu ngokushintshana kwePromax kusetshenziselwe ukuthola ubuqiniso nokwethembeka kokwakhiwa okuyisishiyagalolunye kwemodeli yomqondo. Ukuhlaziywa kwesici sokuqinisekisa (i-CFA) kwenziwa ngokusebenzisa i-, uhlelo lwesoftware ukuqhubekisela phambili ukuvivinya ubuqiniso nokwethembeka kokwakhiwa. Okutholakele kuveze ukuthi idatha yemodeli yokwakhiwa yamukelekile futhi yonke imicabango eyi-9 ehlolwe ibalulekile. Okutholwe yilolu cwaningo okubandakanya ukunikela okusebenzayo, okwezemfundo Kanye nokwenziwa kwemigwaqo kunomthelela omkhulu ekuthuthukisweni kolwazi lwamanje endaweni yokuthuthukisa ukulethwa kwezinsizakalo zamanzi emazweni asathuthuka njengeNingizimu Afrika.
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    A policy framework for the implementation of sustainable construction in Nigeria.
    (2020) Babalola, Ayotunde Anthony.; Harinarain, Nishani.
    The practice of sustainable construction improves the quality of life of the citizenry. Based on the need to realise the tripod of economic, environmental and sociological improvements, many countries have realised the need to develop individual policies and plans to attain sustainability especially within the construction industry. While patterns of improvements and adequate policies are noticed in some developed countries, a lot of developing economies still grapple with the policy development stage for improved and sustainable construction patterns. Policies constitute the backbone on which decisions are made, practice is predicated and regulated, and it was thus expedient to demonstrate the effects of policies on sustainable construction practice especially in the context of developing countries. This study developed a policy model for the implementation of sustainable construction practice in Nigeria. The model lays a foundation for policy development and industry transition towards sustainable construction. Based on in-depth literature reviews on sustainable construction practices in both developed and developing economies and policy development and practice in selected model countries, a conceptual model was developed. Eleven semi-structured interviews were conducted in addition to two separate focus group discussions with seasoned construction professionals in the capital cities of Abuja and Lagos in Nigeria to confirm the outcomes from the literature review, gain a deeper understanding in a qualitative nature and refine the draft quantitative study instrument. Data obtained at this stage was analysed using Nvivo 12. The data collection was based on probability sampling where 380 questionnaires were distributed, and 249 complete responses were received. Exploratory factor analysis (EFA) using Statistical Package for the Social Sciences (SPSS) version 27 using Maximum likelihood with promax rotation was used to determine the validity and reliability of the four constructs of the conceptual model. Confirmatory factor analysis (CFA) was conducted using AMOS Version 27 software programme to further test validity and reliability of constructs. The CFA revealed acceptable model fit of the measurement model after re-specification of some of the measurement models. At the end, the second order model was tested to determine the relationship among the constructs. The findings revealed that the data was acceptable, and all the four hypotheses tested were found to be significant. The findings of this research which include identifying the clear roles of the government as both a regulator of the industry and as a client for public infrastructure, relevant stakeholders in the industry and implementation patterns for sustainable construction practice have practical, academic, and methodological contributions to the evolving current body of knowledge in the area of policy development for sustainable construction practice specifically in the context of developing countries.