CONCRETE 1:3:6, Grade 15 N/mm2 (MPa)

CONCRETE 1:3:6, Grade 15 N/mm2 (MPa)
1.COMPOSITION
Ingredient		Specification		Quantity
Cement		Ordinary Portland Cement		1 part in 10 of dry volume
Coarse sand		Coarse sand used for concrete mixing doesn’t have clay or organic matter. The fine sand shall not be used in concrete mixing.		3 parts in 10 of dry volume
Aggregate 20x40 mm		Minimum stone size 20 mm, maximum size 40 mm. No dust, clay or organic matter.		6 parts in 10 of dry volume
Water		Clean and free water from any organic or inorganic matter in solution or suspension. It shall not contain any grease or greasy particles, clay or salt ( Drinking water).		105 litres per m3 of mix or 23 litres per 50 kg bag of cement, but anyway the minimum amount needed to mix and pour concrete
1.OTHER REQUIREMENTS
		The consistency of fresh concrete shall be monitored by slump test: Minimum slump: 80 mm Maximum slump:120mm Concrete compressive strength should be Strength Grade   15 N/mm2
3.CONSTRUCTION TECHNIQUES
Concrete mixing 1:3:6		Mixing by hand for small works or by machine for large works
Compaction		Compact by hand poker or simple equipment for small works or by mechanical vibrator for large works
Construction joint		The construction joints shall be made where concrete placing operations end for the day or where one concrete structural element is cast against a previously placed concrete structural element. The construction joint shall extend entirely through the concrete element. In a normal contraction joint load transfer, additional to that provided by reinforcing steel when present at the joint, shall by aggregate interlock. This requires the first placed concrete to have a rough and irregular surface at the join. If the roughened surface is prepared by scab bling then the joint must be thoroughly cleaned with compressed air or other effective means before placing fresh concrete. Keyed joints shall not be used because this method has poor load transfer, especially for unreinforced concrete. If the construction joint is made smooth in unreinforced concrete then dowel bars shall be used to achieve load transfer across the joint.
Finishes		Smooth surface finishes are not required for the ue permitted in 4 below.
Curing		Newly placed concreteafter 6 hours shall be protected from drying wind,              rain and sun by completely covering it with plastic (or other)                 sheeting. The concrete, including exposed faces, shall be frequently wetted by              approved means for at least 7 days after placing. During the curing period, the concrete shall be left undisturbed other than              works to be covered.
4.USES
Concrete 1:3:6 used for			Mass concrete foundations. Blinding concrete. Pre-foundation of culvert.
5.CALCULATION OF MATERAIL QUANTITIES PER 1m3 OF CONCRETE			Concrete 1:3:6
Material	Amount	Unit
Cement	230	kg
Coarse Sand	0.45	m3
Aggregate 20x40mm	0.90	m3

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