14-06-2013, 03:04 PM
CHARACTERISATION OF THE BEHAVIOUR OF ULTRA-HIGH PERFORMANCE CONCRETE (UHPC)
CHARACTERISATION.pptx (Size: 1.83 MB / Downloads: 55)
INTRODUCTION
Concrete is a mixture of cement, sand, gravel and water
Concrete has been used since ancient times. Regular Roman concrete for example was made from volcanic ash and hydrated lime.
Types of Concrete : Modern concrete
High-strength concrete
Stamped concrete
High-performance concrete
Vacuum concrete
Self-consolidating concretes
Here our interest topic is “ULTRA-PERFORMANCE CONCRETE”
What is UHPC?
It is also known as Reactive Concrete (RPC). It is a high strength, ductile material formulated by combining Portland cement, silica fume, quartz flour, fine silica sand, high-range water reducer, water and steel or organic fibres.
The concept of UHPC was first developed by Richard and Cheyrezy (1994). Very low water-to-cementitious materials ratios are used to produce this kind of concrete. In a more accurate sense, UHPC is not concrete because it contains no coarse aggregate.
Why is UHPC better than the Normal Concrete?
It has Compressive Strength up-to 200 Mpa whereas normal concrete have btw 25 to 35 Mpa
It has Flexural Strengths up-to 50 Mpa
Its Modulus of Elasticity is btw 45 to 50 Mpa
It has high bending tensile strength
It is more Stronger and Durable etc
APPLICATIONS
UHPC is being considered for use in a wide variety of highway infrastructure applications. The high compressive and tensile strengths allow for the redesign and optimization of structural elements. Concurrently, the enhanced durability properties facilitate a lengthening of design life and allow for potential use as thin overlays, claddings, or shells.
Scraper paths in treatment plants
Architecture
Bridge
Narrow support
Filigree beams
Thin or slab like components
Buttresses for high pressure