materials and waste management

8/7/2019 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


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


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


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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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


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

materials and waste management

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