POOR CONCRETING MAJOR CAUSE OF BUILDING COLLAPSE – NBRRI

POOR CONCRETING MAJOR CAUSE OF BUILDING COLLAPSE – NBRRI Nigerian Building and Road Research Institute (NBRRI) has identified poor concreting as a major cause of collapse of buildings in Nigeria. lack of bond between steel and concrete. "There is clear evidence that the reinforcement for all structural elements (floors, beams and columns) had dissociated from the concrete during demolition. 7 percent of collapse buildings belong to private, public and corporate organisations, respectively. He further noted that 70 percent, 23. "Site supervision on construction sites is both a professionally mandatory function in addition to a regulatory role. Matawal said notwithstanding other factors that may have precipitated the collapse, such as deficiencies of foundations, columns, beams or other structural elements and use of inferior materials, the sudden failure of the structures denoted that there was poor concreting on the various sites. The inspection also reveals that coarse aggregate size as large as 40mm could have been used in the batching process. "In NBRRI investigations, there has been no convincing evidence to suggest that structural designs were lacking though in most of the situations, especially in Lagos and Enugu, it was a hazard to the lives of our resource personnel to insist on obtaining these documents. Thus the town planning and/or development control authorities should insist that all mandatory documents necessary for the successful execution of a project are made available before the commencement of construction and that proper supervision machinery is set up on every site. "Nonetheless, it is essential to emphasize that care should be taken not only to make sure that there ought to be structural designs for every project, but also to request that all ultimate and serviceability limit states are properly checked and complied with. "In the projects that NBRRI has visited because of failures, there were no project sign boards to state name of project, the client, the architects, the structural engineers, and the quantity surveyors. POOR CONCRETING MAJOR CAUSE OF BUILDING COLLAPSE – NBRRI Trade News selected by Local Linkup on 05/06/2012