13-07-2012, 02:28 PM
HIGH AND ULTRA HIGH PERFORMANCE CONCRETE
![Microsoft PowerPoint 2007 Document .pptx](https://seminarproject.net/images/attachtypes/ppt.gif)
INTRODUCTION-CONCRETE
The word concrete comes from the Latin word "concretus" (meaning compact or condensed), the past participle of "concresco", from "com-" (together) and "cresco" (to grow).
Concrete is a construction material composed of cement ,coarse aggregate , plus a fine aggregate such as sand, water, and chemical admixtures.
ORIGIN OF HPC AND UHPC
Environmental aspects
The necessity to decrease the amount of CO2 in atmosphere.
Replacement of Portland cement in concrete with environmental friendly binders.
Waste materials silica fume, fly ash or ground granulated blast furnace slag comes into account.
HIGH PERFORMANCE CONCRETE
High performance concrete (HPC) has been defined as a concrete that is properly designed, mixed, placed, consolidated, and cured to provide high strength and low transport properties or good durability.
A new term “high performance concrete "is used for concrete mixture which possess high workability, high strength, high modulus of elasticity, high density, high dimensional stability, low permeability and resistance to chemical attack.
APPLICATIONS OF HPC
Bridge deck construction
Prestressed concrete
Dam construction:U.S. Army Corps of Engineers (USACE) is using HPC to construct a replacement dam.
Precast structure
Towers: Cleveland Society Towers--pumping challenges
CONCLUSION
HPC and UHPC is not one product but includes a range of materials with special properties beyond conventional concrete and routine construction methods.
This will produce an environment friendly concrete mix by replacing large amount of portland cement which produce CO2 during it’s production.
Along with strength, other properties like durability, permeability, etc required in construction field according to the environment will produce by HPC and UHPC.