Untitled - Malaysian Institute of Planners

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Muhammad Abu Eusuf, Mansor Ibrahim & Rafikul IslamThe Construction and Demolition Wastes in Klang Valley, MalaysiaTable 11 provides the summary of the most commonly used methods to dealwith varieties of C&D waste materials.Types of C&DwasteWoodConcreteReinforcedConcreteReinforcementDrywallMetalsPlasticsRoofingRubbleBricksGlassRubberPaper/ CardboardsOthersTable 11: Application of C&D waste management methodsWaste management methodReduce Reuse Recycle Composting Burning Land fillAll possible measures need to be taken to minimize the constructionwastes. Respondents were asked to provide their opinion on the effectiveness ofa number of wastes minimization strategies. Table 12 provides the summaryresults.Potential wasteminimization strategiesAppropriate location forstorageFabrication: Handling andcutting of materialsappropriatelyStandardization andflexibility in designsEnsure appropriatedimensions and quality ofmaterialsProper implementation ofmaterials management planEarly plans for purchasesand deliveriesReturn ability of unusedcontainers and palletsAccuracy in take-offquantitiesProvide convenientcontainers for materialsstorage and retrievalTable 12: Opinion on waste minimization strategiesLevel of agreement/disagreementMeanStrongly Disagre Neutral (3) Agree (4) Stronglydisagree (1) e (2)agree (5)0 (0) 1 (3) 7 (22) 17 (53) 7 (22) 3.940 (0) 1 (3) 9 (28) 14 (44) 8 (25) 3.911 (3) 1 (3) 7 (22) 16 (50) 7 (22) 3.840 (0) 2 (6) 9 (28) 14 (44) 7 (22) 3.810 (0) 2 (6) 7 (22) 18 (56) 5 (16) 3.810 (0) 1 (3) 11 (34) 15 (47) 5 (16) 3.750 (0) 1 (3) 11 (34) 16 (50) 4 (13) 3.720 (0) 1 (3) 14 (44) 12 (38) 5 (16) 3.660 (0) 2 (6) 15 (47) 8 (25) 7 (22) 3.63*It is noted here that the total sample size is 32© 2012 by MIP 118
PLANNING MALAYSIAJournal of the Malaysia Institute of Planners (2012)According to the respondents, the most preferred strategies are the following:Appropriate location for storageAppropriate cutting and handling of materialsDesign standardization and flexibility in designEnsure appropriate dimensions and quality of materialsProper implementation of materials management planSurprisingly, respondents’ profession and extent of working experiencedo not have significant effect on the findings on the waste minimizationstrategies. In the relevant 1-way ANOVA, the minimum p-value and thecorresponding F-value were found to be 0.166 and 1.926, respectively(profession); the corresponding values for working experience are 0.083 and2.722, respectively. Same is the observation even considering all the strategiestogether as it is noted from Table 13.Table 13: 1-way and 2-way MANOVA tests results on the waste minimization strategies.Type of Independent Wilk’s λ F p Partial 2 ObservedMANOVA Variablepower1-way Profession 0.461 0.947 0.534 0.321 0.518Experience 0.413 1.237 0.280 0.358 0.6832-way Profession 0.473 0.606 0.861 0.312 0.280Experience 0.358 0.894 0.591 0.401 0.423Profession *Experience0.116 1.009 0.483 0.417 0.688However, the 3 × 3 ANOVA experimental results show significantinteraction on two strategies, namely, ‘Standardization’ (F(4,20)=4.892,p=0.006, 2 =0.495) and ‘Unused containers’ (F(4,20)=3.151, p=0.037, 2 =0.387). With regards to main effect, experience (F(2,20)=4.773, p=0.020, 2 =0.323) has significant impact on ‘Purchase plan’. Contractors (M=4.000)consider that this strategy has more potential to minimize CDW at constructionsites compared to quantity surveyors (M=3.300). At the end of thequestionnaire, the respondents were asked to provide more recommendationswhich they feel appropriate in order to reduce C&D waste materials andimproving efficiency of waste management at the construction sites. Thefollowing recommendations are provided herewith that possess higherfrequencies:Implement the Industrialized Building System (IBS);Control the purchasing activities systematically in order to preventsurplus materials;119© 2012 by MIP
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