Table 5
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. | |||
|---|---|---|---|---|---|---|---|---|---|
|
|
|
|
|||||||
| Mean | Rank | Mean | Rank | Mean | Rank | ||||
| 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 |
| Cluster value | 4.02 | 3.94 | 4.06 | −1.31 | 0.19 | ||||
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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