Authors:Ijigah Edoka Augustine, Akanni; Prince Abstract: The rapid population growth and increased housing demand have exacerbated environmental challenges, such as excessive waste generation and high energy consumption. The aim of the study is to investigate the barriers hindering the widespread adoption of green building technologies in Nigeria's construction sector. Random sampling method was used to collect information from the respondents. A sample size of three hundred and eighty-four (384) questionnaires were distributed through an online link and three hundred and eighty-four (384), which equates to a hundred (100%) percent of questionnaires distributed. The mean score and sum were employed in for ranking the professionals experience in the field with various barriers and their severity. From the results, positive ratings concerning client satisfaction (4.22), building functionality (4.19), clarifications of technical specifications (3.78), and stakeholders’ satisfaction (4.06) were uncovered in the field. High ratings for technology awareness amongst professionals (3.53), and availability of a skilled workforce (3.22) were revealed. To facilitate sustainable construction practices, it is essential to bolster awareness (3.19), ensure the availability of a skilled workforce (3.22), encourage public engagement (3.09), expand financing options (3.03), and enhance government support (3.00). Crucially, addressing project management, compliance, and quality control barriers is vital. By prioritizing these factors and overcoming barriers, Nigeria's construction industry can champion green building, preserve resources, and achieve sustainable outcomes. Keywords: Adoption, Green building technologies, Barriers, Nigeria’s construction sector, Sustainability DOI : 10.7176/CER/16-1-07 Publication date: June 30th 2024 Issue No:Vol. 16
Authors:Yasser Congo, Chen Qizhi Abstract: With continuously upgrading and transformation of the urban infrastructure such as railway, road, subway, municipal engineering etc., the scale and the amount of urban underground construction are apparently enlarged. Thus, the newly-built urban underground construction will inevitably face close-space construction or even super close-space construction in the situation of tight urban land, complex underground pipelines and highly three-dimensional architectural layout. The negative environmental effects of the underground engineering construction closed to an existing building have been systematically and thoroughly studied according to the present research results. However, there is insufficient attention paid to the negative environmental effects induced by the construction of a deep foundation pit of narrow and long subway station "parallel with the existing subway section for a long-distance" Therefore, taking the deep foundation pit of narrow and long subway station "parallel with the existing subway section for a long-distance" in soft clay as a research subject, the ground movement induced by deep foundation pit construction and the additional response of the existing subway section is studied in this thesis First, the supporting structure deformation and ground settlement induced by the construction of a deep foundation pit of a narrow and long subway station in soft clay and the additional response of the existing subway section are analyzed through numerical simulation method, and the calculation results are compared by utilizing two constitutive models (i.e., Plastic-Hardening model and Mohr-Coulomb model). The results show that the negative environmental effects induced by the construction of a deep foundation pit of narrow and long subway station parallel with the existing subway section for a long- distance are significant and should be paid high attention to. By contrast to the Mohr- Coulomb model, the calculation results using Plastic-Hardening can reflect the characteristic of the deformation for soft clay induced by the construction of deep foundation pit of a narrow and long subway station. Moreover, a parametric study is conducted by utilizing the Plastic-Hardening model in which the influence of the horizontal distance between the existing subway section and long and narrow deep foundation pit as well as the buried depth of existing subway section and other critical factors on the additional response of the existing subway section induced by the deep foundation pit. The results show that both the horizontal distance between the existing subway section and the long and narrow deep foundation pit as well as the buried depth of the existing subway section has a great impact on the additional response of the existing subway section. The additional response of the existing adjacent subway tunnel decreases with the horizontal distance between the existing subway section and the long and narrow deep foundation pit becoming larger Keywords: deep excavation, existing tunnel, soft-soil, deformation, plastic-hardening, constitutive model, Mohr-Coulomb DOI : 10.7176/CER/16-1-06 Publication date: May 31st 2024 Issue No:Vol. 16
Authors:Ignatius Suprih Sudrajat, Yacobus Sunaryo Abstract: The aim of this study is to analyze the value of environmental efficiency on rice production which is influenced by labor, seeds, organic fertilizers, organic pesticides, chemical fertilizers and chemical pesticides. This study was carried out in paddy fields in Kertarahayu Village, Pamarican District, Ciamis Regency, West Java Province, Indonesia with a sample of 50 farmers obtained by the method deep interview. This study uses a stochastic frontier approach with cross section data. The results of this study indicated that the most significant influence on the environmental efficiency of rice production in Ciamis Regency is ZA fertilizer. From the results of the environmental efficiency index analysis, it can be seen that Ciamis Regency has a gamma value of 0.00263. This means that Ciamis Regency has a small environmental inefficiency value (<1). Keywords: agricultural development, environmental efficiency; production input; stochastic frontier, Ciamis DOI : 10.7176/CER/16-1-05 Publication date: April 30th 2024 Issue No:Vol. 16
Authors:Asmamaw Ketema Gizaw Abstract: Gypsisols, a distinct soil order recognized by the presence of gypsum as a primary soil-forming mineral, play a crucial role in shaping terrestrial ecosystems and influencing environmental processes. This research review provides a comprehensive examination of Gypsisols, encompassing their key characteristics, genesis, and the broader environmental implications associated with their presence. The paper delves into the unique physicochemical properties of Gypsisols, exploring the impact of gypsum on soil structure, fertility, and water retention. The genesis of Gypsisols is explored, considering factors such as climate, parent material, and biological processes that contribute to the formation of these specialized soils. Additionally, the review investigates the distribution of Gypsisols globally, highlighting regions where they are prevalent and the ecological significance of their presence. Keywords: Gypsisols, Genesis, Characteristics, Distribution DOI : 10.7176/CER/16-1-01 Publication date: January 31st 2024 Issue No:Vol. 16
Authors:Jemal Aliy Gobena Abstract: Expansive soil is a clay soil that changes its volume depending on the seasonal variation of the moisture. These types of soil create serious problems to the civil engineering structures. To improve this different researchers found different method, among this mechanical stabilization using locally available materials are the one. Therefore these study was done on the stabilizing the expansive properties of soil of Ambo city by locally available material.To perform this study soil was taken from five (5) pits, on 15km under construction road in Ambo city and Ambo sand stone from Sankale Faris. This study was done by mechanically mixing the ambo sand stone with expansive soil by percent. The mix ratio was prepared by 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% for ambo sandstone of mass of soil and the engineering properties of pure expansive soil and mixed soil with sand stone were done accordingly.The lab result indicates that as sand stone increases in the mixes, the liquid limits, plastic limits, shrinkage and free swell of treated soil decreases, the CBR increases. The UCS increase as the sand stone percentage increases to 60% and then decreases. Hence, the addition of this stabilizer decreases the plasticity properties of the treated soil. Therefore, the optimum mix ratio was attained at 60% ambo sand stone to stabilize the soil. The mixes of ambo sandstone changes the geotechnical properties of the natural soil and makes this soil to be suitable for subgrade construction. Keywords: Geotechnical properties, Sand Stone, Stabilization, Subgrade, Swelling DOI : 10.7176/CER/16-1-02 Publication date: January 31st 2024 Issue No:Vol. 16
Authors:Sam C. M. Ofori Abstract: Urban regeneration faces both conceptual and process challenges. Conceptually, it tends to have a variety of definitions and meanings. However, while urban regeneration, which is basically the comprehensive improvement of degenerated and declined built environments, urban renewal is only a physical form of it and, itself, has several sub-modes, including slum upgrading. In practice, however, there tends to be a mix of all these by different actors, which are portrayed in the ZICRDP. Similarly, various attempts have been made to develop procedural process models for explaining, assessing and undertaking urban regeneration and renewal transformation processes. Three of these were reviewed but none was considered adequate, independently, for assessing and explaining urban regeneration and renewal interventions. An alternative approach, which combined procedural planning processes - preparation for the intervention, problem identification, statement of objectives, data management, strategy generation, policy formulation, plan design, implementation, monitoring and evaluation - and experiential learning theory was, therefore, developed for the purpose. The former was useful in assessing the various stages of the urban regeneration process, including elements of project management, the latter addressed more of the emotional, relational and knowledge development experiences of participants and stakeholders as well as future programme performance. Keywords: urban regeneration and renewal, slum upgrading, procedural planning process, project management processes, experiential learning theory, Zongo and inner-city communities, inclusive participation DOI : 10.7176/CER/16-1-03 Publication date: January 31st 2024 Issue No:Vol. 16
Authors:Sam C. M. Ofori Abstract: Urban regeneration tends to mean different things to different people, everywhere. Particularly in the developing countries, holistic urban regeneration tends to be mixed up with its, generally, physical form, urban renewal, and its own sub-modes, including slum upgrading. These portray in Ghana’s Zongo and Inner-Cities Regeneration Programme, initiated in 2017, especially for reasons of political economy, politics, financing, institutional, and character of urban degeneration. However, since, significant achievements have been made in terms of physical, environmental, economic, social and cultural transformation. Such progress as well as challenges encountered hold implications for future project implementation. The latter includes inadequate funding and personnel, political interference, lacking scale-up, limited programme coverage, ineffective community management structures, constrained project planning, other institutional and governance issues. Suggestions are made for the amelioration of these, focused on adequate funding, institutional reforms, a proactive and settlement/spatial planning approach, and introduction of Zongo Community Development Committees. Keywords: Urban regeneration, urban renewal, slum upgrading impacts, Zongo and Inner-City Regeneration and Development Programme, urban policy, institutional contexts, urban sustainability DOI : 10.7176/CER/16-1-04 Publication date: January 31st 2024 Issue No:Vol. 16