An Assessment Of Time Variation In Solid And Hollow Floor Construction In Lagos State

Abstract

The choice of construction method employed for constructing suspended slabs in buildings tend to impact significantly on the delivery time of building project. Thus, this study aims at assessing the impact of various construction methods on duration for constructing hollow and solid floor slabs in buildings in Lagos State, Nigeria. The research design for this study was a survey design approach and the populations of the study were professionals involved in construction projects; Architects, Civil Engineers, Builders, Quantity Surveyors, Building Services Consultant and Contractors. These are the major participants in the construction industry in Lagos State, Nigeria. The analysis is based on 46 (forty-six) returned questionnaires out of the 60 (Sixty) questionnaires administered. The data from the questionnaires were analyzed using descriptive statistics tools such as frequency, percentage mean ranking while the hypothesis were tested with a paired sample t-test tool. It was found that the systems or methods of slab construction well known to the respondents are cast in situ, precast and semi-precast. The Cast in-situ beam and slab construction ranked as the most frequently adopted method followed by flat slab, hollow clay pot and waffle slab construction. In terms of construction time, placing reinforcement and construction of formwork takes more time than other processes in solid slab construction while in construction of reinforced cast in situ concrete hollow slab; formwork construction, placing hollow bricks or blocks or moulds on formwork and curing concrete takes more time than the other processes involved.

The relationship between labour-only procurement and health and safety performance of construction projects

“…While other emerging procurement methods such as direct labour could have been examined, the motivation for focussing on LoPS includes that this is just a stepping stone to the topic; its adoption in projects is increasing (Ogunde, 2011;Awodele et al, 2019) and gaining popularity (Ogunsanmi, 2013). The procurement method has been established as one of the strategies for clients to save money and cope with harsh economic conditions (Awodele et al, 2019), and it enables them to have more control of the project (Adenuga, 2003;Umeokafor et al, 2020a). This is discussed in detail in the literature review.…”

Life Cycle Costing and Assessment of Building Slab Materials

“…Another of such material is the Hollow clay pot. Hollow clay slabs, a product of modern designs, now require less formwork, less reinforcement, and less concrete as a result of the space, holes, foams, and balls that are included in the slab [8]. Lai [9] also corroborated to the fact that the holes or voids, which are included in the slabs replace the ineffective concrete in the neutral zone of the slab, thus reducing the dead weight and increasing the slab efficiency.…”

Technical Evaluation of Integrated Wall and Roof Formwork System and Its Comparison with Ordinary Concrete Building Construction Method

“…In France, it took only 640 hours to build 65 building blocks each with 20 apartment units, 120 square meters in area, for the total construction of which about 40000 cubic meter of concrete was consumed [18]. Due to the same reason, the system drew the attentions of the majority of the mass-constructors in Nigeria [19].…”