Mean, rank, t-test and significance of the respondents on GB construction and demolition waste management needs.
|S/n||Items||Total sample||Group 1||Group 2||t-cal||Sig.|
|Construction waste management requires:-|
|67||Applying source reduction through calculated procurement||4.15||3||4.22||1||4.11||6||0.60||0.55|
|68||Improving waste management onsite through metering / measuring of resources||4.04||7||4.07||2a||4.02||7a||0.25||0.81|
|69||Acquainting site workers to waste management strategies||4.10||5||4.00||6||4.15||5||−0.91||0.36|
|70||Sourcing materials off-site||3.70||11||3.61||11||3.74||11||−0.66||0.51|
|71||Ensuring timely delivery of materials, fittingly fabricated||4.07||6||3.89||8||4.17||4||−1.63||0.11|
|72||Avoiding 10% extra procurement in tendered document||3.92||9||3.78||9||3.99||9||−1.12||0.27|
|73||Negotiating for buy-backs of materials not used||3.81||10||3.70||10||3.87||10||−0.79||0.43|
|74||Using designed sections for mixing and concreting||4.16||2||4.07||2a||4.21||2||−0.86||0.39|
|Demolition waste management requires:|
|75||Material auditing before deconstruction or demolition||4.18||1||4.04||4||4.25||1||−1.25||0.21|
|76||Onsite sorting of waste materials using designated areas||4.13||4||4.02||5||4.18||3||−1.00||0.32|
|77||Reusing of would-be wastes onsite e.g. concrete masonry unit wastes for filling||3.99||8||3.91||7||4.02||7a||−0.53||0.59|
Note: Group 1 refers to lecturers, instructors, teachers and technologists teaching building construction and related trades in tertiary and secondary institutions. Group 2 refers to building industry workers such as engineers, architects, technicians, plumbers, etc with minimum of Senior Secondary certificate in building related trades. a = Equal ranks wherein the next rank is skipped; t-cal = Calculated t-value; Sig. = Level of significance at 0.05.
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