Download - Materials and Waste Management
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By
Dr. Mahdi Damghani
Materials Management
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Why is construction materials management important???
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Bad material management is one of the major factors in the loss of
money within any construction company.
Materials cost + cost of unloading + cost of storing + cost of
transporting half of the contract value
Make sure that wastage is minimised.
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Name some of the costs of waste materials???
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The cost of waste
Management costClean up cost
Tipping fee
Delivery cost
Handling costWaste hauling cost
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Conceptual relationship between cost of
materials management and cost of waste
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Name some of the common causes of waste???
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Common causes of
waste
Careless unloading and
handling
Damage by following
trades
Inaccurate ordering
Undocumented
variation
Theft and vandalism
Inadequate storage
Poor workmanship,
negligence
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Name some the areas that require attention tocontrol materials waste in construction industry???
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Control material
waste areas
Transportation
Communications
Unloading
Quality control
Storage areas
Haul routes
Handling process
Security and protection Accurate requisitioning
Plan of the organisation
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How do you normally specify the quantity and thequality of construction materials???
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Accurate requisitioning
QuantityQuality
Is normally stated in
the contractMeasured on siteScaled drawings
Order delivery of materials over the period of
the construction process (prolonged period)
Avoid total bulk order, why???
Ensure sufficient buffer storage is maintained to
offset the effects of suppliers delayed deliveries
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Name some of the construction materials???
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Some construction materials
Carcassing timber
Sand and aggregate
scaffolding
Precast concrete
Joinery
Formwork
Reinforcement
Cement
Roofing feltsPlumbing
Plasterboard
Ironmongery
Paint
Wall and floor tiling
Bricks and blocks
Floor boarding
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Sand and aggregate
1- avoid contact between different materials
2- do not overstock
3- avoid direct contact with soil4- provide drainage to prevent build up of moisture content as this affects the
strength of concrete mix
5- label them
6- provide cover for frost protection as this changes the size of aggregates for
concrete mix and intended compressive strength of concrete.
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1- select correct size silo
2- if bagged store under cover
3- avoid contact with soil as this decreases compressive strength of concrete
4-do not stack above 5 bags high
5-use in order of delivery
Cement
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1- avoid contact with soil
2- ensure adequate number of bearers to prevent overstress
3- ensure lifting points clearly identified
4-do not stack above 1.2 m high
5- choose a position away from traffic routes r provide barriers
Precast concrete
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1- clean soil before stacking
2- ensure adequate bearers to prevent distortion3- limit height of stacks-to discourage people from climbing up
4- props and other fixings, provide pallets and/or racks
5- ensure use of nail boxes by each carpenter
6-ensure that telescopic props are cleaned, oiled and complete before stacking
Formwork
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1- have bent and cut off site
2- avoid contact with soil
3- ensure adequate bearer to avoid distortion
4- ensure no contact with oil, grease, diesel etc as this reduces the bond
between reinforcement and concrete5-ensure they are labeled correctly.
6- do not permit early delivery of bars.
7- encourage fixers to use reels fixed to their belts to reduce waste of tying
wire.
8- provide sufficient storage and access space.
Reinforcement
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1- ensure clean, level form base
2- avoid contact with soil
3- do not stack them up for more than 1.2 m or 2 pallets high4- do not stack more than 1 m wide
5- leave enough space for forklifts etc
6- protect from excessive moisture and frost
7- refuse delivery of loose banded bricks or damaged pallets
8- ensure that blocks are stacked on edge
Bricks and blocks
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1- ensure tubes are stored in racks off the ground
2- ensure that scaffold boards are stored off the ground and protected from
excessive moisture and frost3- allow for ventilation
4- ensure fittings stored in their own bins and bins clearly marked
5- ensure that scaffolding is carefully checked on and off site by one numerate
responsible person
scaffolding
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1- ensure timber to correct specification, i.e. twist, shakes, knots free from
fungal growth and wavy edges
2- ensure timber clearly allocated
3- avoid contact with the soil
4- protect from the rain, frost etc5- allow for ventilation through stacked timber
6- be stacked in horizontal racks
7- provisions made for collection and storage of offcuts
8- ensure that trussed rafters and roof trusses are not stored flat without
adequate support9- ideally trusses and trusses rafter should be stored upside down in racks with
the weight carried at the purlin position.
Carcassing timber
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1- window and door frames must be stored horizontally or vertically but must
be adequately supported to prevent distortion.
2- remove any plastic type wrapping before storage unless temperature and
humidity can be controlled.
3- joinery should be stored in a cool dry secure store4- joinery units should not be stacked more than 3 high
5- ensure adequate ventilation and space for access
6- mouldings should be stored in horizontal racks
7- ensure provision made for collection and storage of off cuts
8- mouldings should be primed before storage
Joinery
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1- remove any wrapping before storage
2- avoid contact with soil
3- store on racks
4- ensure adequate support to prevent distortion
5- store in dry condition
6- allow for ventilation through store timber
Floor boarding
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1- avoid contact with soil
2- must be stored in cool, dry condition away from direct heat
3- different grades must be kept separate
4- roofing felts and dpcs should be stood on end
5- rolls in excess of 1.2m and dpms should be stored horizontally
6- avoid any possible contact with acid or petroleum based products
Roofing felts
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Damp Proof Membrane (DPM)
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1- do not accept early delivery
2- all plumbing goods and fittings should be stored in a secure compound and/or
locked store3- C.I., P.V.C., Pitch Fibre and asbestos cement materials should be stored on
horizontal racks
3- fittings should be stored in clearly marked bins
4- S.G.W pipes should be neatly stacked
5- S.G.W fittings should not be stacked and should avoid contact with the soil6- ensure adequate space for store and access
7- sanitary goods should be stored under cover protected from physical damage
8- wrappings should be retained whenever possible
9- items may be stacked but not exceeding 5 no. e.g. P.V.C Baths
10- ensure provision for storage and collection of off cuts11- all electrical and mechanical goods and fittings must be stored in a cool dry
secure store
12- all ventilation trunking should be stored in a cool dry store, stacks not exceeding
4 layers high
13- adequate support must be provided to prevent distortion
Plumbing
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Asbestos cement
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Pitch fibre pipes
P.V.C pipes
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1- must be stored in dry conditions
2- avoid contact with soil
3- keep different grades and types separate and label them
4- keep in packs whenever possible stored horizontally with adequate bearersto prevent distortion
5- when loose store vertically on long edge
6- ensure adequate ventilation
7- angle beads should be stored in the delivery box wherever possible if not
then in vertical racks
Plasterboard
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normal
Fire proof
Water proof
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Angle bead
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1- must be stored in dry, secure conditions2- store in cartons wherever possible, not exceeding 3 high
3- keep different grades, types separate with particular regard to colour batch
numbers
4- rolls of flooring should be stored vertically wherever possible in dry secure
conditions away from direct heat
Wall and floor tiling
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1- must be stored in dry, secure and frost free conditions away from direct heat
2- keep paints and other flammable liquids separate from other materials
where possible
Paint
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1- must be stored in dry, secure conditions
2- should be kept on shelves in wrapping etc
3- sets should be prepared at the stores or by the supplier
Ironmongery
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Quality control
Dimensional exactnessAppearance
Functional performanceProtection
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Pre-construction people involved in materials
management
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Construction site people involved in materials
management
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Off-site people involved in construction materials
management