HIGH STRENGTH CONCRETE

BY MEESUM HUSSAIN ZAIDI

NED UNIVERSITY OF ENGINEERING AND

TECHNOLOGY

Ingredients Of Concrete

Cement

Crush

Fine Aggregate

Water

Admixture (For some special purposes)

CEMENT

Cement is made up of naturally occurring elements and materials. In it you can find clay, limestone, silica, and more, all of which are combined in a cement kiln.

CRUSH(COARSE AGGREGATE)

Construction aggregate, or simply "aggregate", is a broad category of coarse particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates. Aggregates are the most mined materials in the world. Aggregates are a component of composite materials such as concrete and asphalt concrete; the aggregate serves as reinforcement to add strength to the overall composite material.

FINE AGGREGATE(FILLER)

Aggregate passing the 3/8" sieve and almost entirely passing the No. 4 (4.76 mm) sieve and predominantly retained on the No. 200 (74 micron) sieve (ASTM125).

Water

Water is the key ingredient, which when mixed with cement, forms a paste that binds the aggregate together. The water causes the hardening of concrete through a process called hydration. Hydration is a chemical reaction in which the major compounds in cement form chemical bonds with water molecules and become hydrates or hydration products.

HIGH STRENGTH CONCRETE

HIGH STRENGTH CONCRETE

ACI defined high-performance concrete as a concrete meeting special combinations of performance and uniformity requirements that cannot always be achieved routinely using conventional constituents and normal mixing, placing, and curing practice.

How to make high strength concrete?

WHAT WE USE TO MAKE HIGH STRENGTH CONCRETE

Total mix ratio 1:2:4

cement (OPC)

Crush

Fine Aggregate

Water

Fly Ash Pozzocrete 100

Fibre

Fly Ash Pozzocrete 100

.

AMOUNT OF MATERIALS WE ADDED IN OUR HIGH STRENGTH CONCRETE

MIX

Cement = 3000g

Crush = 12000g

Fine Aggregate =6000g

Water Cement ratio = 44%

Fly ash Pozzocrete 100 = 450g

Synthetic Polypropylene Fibre = 18g

Why we use Fly Ash Pozzocrete 100?

Because of its some properties that are given below ,

High early strength exceeding 70 Mpa (28 days). High performance super fine fly ash pozzolanic material. Economical and efficient alternative to micro-silica in performance. In fresh state, concrete mix is highly cohesive and easy to work in

comparison to harsh and sticky micro-silica mix. Reduces heat of hydration. To achieve the same slump, Pozzocrete 100 mix has lower water demand

in comparison to micro-silica mix. In hardened state, increase compressive strength and the associated

engineering properties such as tensile strength and modulus of elasticity. Improves durability and resistance against chloride and sulfate attack.

Why we use fibre in our mix?

Because fibres in concrete create an advanced internal support system that

inhibits plastic settlement cracking. Fibres distribute evenly in the concrete mix and inhibit segregation and settlement of the heavier concrete ingredients. As the heavier ingredients do not drift downward, the mix water is not displaced. The uniform bleeding throughout the concrete gives it the optimum long-term integrity.

fibres increases the tensile strain capacity of concrete fibres reduce this micro-crack formation, it enables the concrete to

progress from plastic to hardened state with greater integrity. Thus the water resistance of hardened concrete is greatly increased.

STARTING OF OUR WORK

FINING OF CRUSH AND FILLER WITH SIEVE 1/2 (inch) & 3/8(inch)

TEMPERATURE WAS NOTED AND IS FOUND TO BE 30‘C

MIXING OF FINE AGGREGATE AND COARSE AGGREGATE

ADDITION OF POZZOCRETE (100) ABOUT 400gm IN OUR MIX

Mixing of concrete ingredients without water

ADDITION OF WATER(1320ml) IN OUR MIX

Mixing (5 min)

POURING MIXTURE IN CUBE(6’’X6’’)

USING VIBRATOR DURING POURING OF MIXTURE

LEVELLING SURFACE OF CONCRETE