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Civil and Sustainable Urban Engineering

Civil Sustain. Urban Eng. , Vol. 3 Iss. 1 (2023) – 3 articles

			View Vol. 3 Iss. 1 (2023)
Published: 15 January 2023
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Assessment of Maintenance Management Practice in Government-owned Tertiary Institution
by Lucky Azubike Osuya, Olumide Afolarin Adenuga, Olalekan Shamsideen Oshodi

Civil Sustain. Urban Eng. 2023, 3(1), pp 1-15;

The state of utilities and infrastructure within an academic institution plays a vital role in learning and the development of human capital. Hence, this study seeks to examine the management practices used in maintaining facilities in a government-owned tertiary institution and then examine the conditions of critical facilities and their related services in the institution. To achieve the study's goal, a questionnaire survey approach was used to collect information about users' and property managers' perceptions of maintenance management practices. The results revealed the existence of a maintenance policy covering critical systems and services. The discovery also implies that maintenance tasks are generated and planned in response to inspections and user requests. Respondents' perceptions of the state of facilities and utilities indicate that they are in good condition. While literature shows school infrastructure issues remain an ongoing concern, the majority of respondents affirm security and electricity as the most important critical infrastructure and services in the institution, amongst others. The most important limitation of the current study lies in the fact that the findings may not be generalizable to other tertiary institutions in Nigeria. Hence, more research needs to be done in order to gather more information about maintenance management practices in public universities and other educational institutions to improve critical facilities and services to enhance learning outcomes. Full text

Durability Performance of Geopolymer Concrete of Various Strength
by Clarence Meripa Meechang, Jayakumar Muthuramalingam, Nicholas Tam

Civil Sustain. Urban Eng. 2023, 3(1), pp 16-24;

Geopolymers, primarily composed of fly ash, have proved an excellent substitute for ordinary portland cement (OPC) in terms of sustainability and productivity. In order to determine the geopolymer concrete's (GPC) resistance to chemical assaults and water permeability, it is necessary to obtain geopolymer concrete (GPC) of varying strengths after normal curing. The objectives of the research was to test the durability performances of the GPC of various strength under normal curing and investigating the optimum strength based on durability testing of the GPC. For this research, different type of cement-to-fly ash ratio was used for various strength data. The appropriate mixture was conducted by using the trial mix method in order to obtain better accuracy of the results data during the mixing design process. To satisfy the varied strength designs, a small proportion of OPC is added to the GPC mixture as part of the mix design. After 28 days of curing, this durability testing is undertaken after the concrete has reached its maximum strength. The compressive strength test and weights were performed and compared to the GPC mix design at 60 °C after heat curing. The 8% OPC replacement has greater resistance to sulfate attack, saltwater exposure, and water permeability compared to the 6% and 7% OPC alternatives. Consequently, the experiment reveals that the GPC's durability and strength increase as the percentage of OPC increases. Full text

Structural Behaviour of Reinforced Concrete Beam with Embedded Polystyrene Spheres
by Jen Hua Ling, Ji Wei Lau, Yong Tat Lim

Civil Sustain. Urban Eng. 2023, 3(1), pp 25-39;

The beam is a structural element in a reinforced concrete structure. However, its weight places additional strain on the columns and foundations.Polystyrene spheres can be used to replace concrete in a beam to reduce its weight. However, this can affect the beam’s structural performance. This study investigated the behavior of beams with embedded polystyrene spheres under loads. The purpose was to determine the feasibility of this technique. Six beam specimens, including a control specimen, were tested under the four-point load setup. The polystyrene spheres’ diameter ranged from 50 mm to 75 mm. The spacing between the spheres varied from 10 mm to 30 mm. By replacing 8.7% of the concrete, the beam's strength increased by 8% per unit of concrete. The polystyrene spheres marginally altered the load capacity but reduced the stiffness, uncracked load, and ductility. The load capacity decreased by 2.6% as the polystyrene sphere’s diameter increased from 50 mm to 10 mm. The strength increased by 0.6% as the spacing increased from 10 mm to 30 mm. For satisfactory performance, the polystyrene spheres with a diameter of 0.57 times the beam’s width may be spaced at 1.2 times the concrete cover. Full text