This document provides an overview of ultra high performance concrete (UHPC), including its definition, history, objectives, constituent materials, structural properties, applications, and factors affecting its use. UHPC is defined as a cementitious composite material that has compressive strengths over 150 MPa. It has superior properties such as very high strength and durability compared to normal strength and high performance concretes. The document discusses UHPC mix designs, testing methods, and innovative applications in bridges and buildings.
A UHPC (ultra high performance concrete) presentation projects.Nolan Mayrhofer
UHPC presentation featuring select international Ductal projects. This is an in depth look at the types of architectural projects UHPC is best suited for.
A UHPC (ultra high performance concrete) presentation projects.Nolan Mayrhofer
UHPC presentation featuring select international Ductal projects. This is an in depth look at the types of architectural projects UHPC is best suited for.
you would be aware about the different types of special concrete being used in india.All these types of concrete are being produced by ultratech concrete, for more details visit www.ultratechconcrete.com/concrete_types.html
This presentation gives a brief introduction on FRC's history, definition and why is it used. Types of FRC's and it's applications is explained in detail in later stages.Also, it covers various properties that affects FRC and a Case study in end.
Quality Control in Concrete and Durability factors : An overview by by RAJESH PRASAD,IRSE, CPM/M, RVNL. KOLKATA. An interesting and informative presentation....
Concrete is made up of ingredients like Cement, Fine Aggregate (Sand), Coarse Aggregate, Water and admixtures. Concrete mix design is done to Optimize the requirements of Cement, Sand, Aggregate and Water in order to ensure that concrete parameters in both Plastic Stage (like workability) and in Hardened Stage (like Compressive Strength and durability) are achieved. The Concrete mix design is as per Indian Standards (IS 10262) and might vary from country to country. The nominal mix design ratios available for concrete less than M30 in strength are only thumb rules and are generally over designed. As the actual site conditions vary and the mix design should be adjusted as per the location and other factors.
you would be aware about the different types of special concrete being used in india.All these types of concrete are being produced by ultratech concrete, for more details visit www.ultratechconcrete.com/concrete_types.html
This presentation gives a brief introduction on FRC's history, definition and why is it used. Types of FRC's and it's applications is explained in detail in later stages.Also, it covers various properties that affects FRC and a Case study in end.
Quality Control in Concrete and Durability factors : An overview by by RAJESH PRASAD,IRSE, CPM/M, RVNL. KOLKATA. An interesting and informative presentation....
Concrete is made up of ingredients like Cement, Fine Aggregate (Sand), Coarse Aggregate, Water and admixtures. Concrete mix design is done to Optimize the requirements of Cement, Sand, Aggregate and Water in order to ensure that concrete parameters in both Plastic Stage (like workability) and in Hardened Stage (like Compressive Strength and durability) are achieved. The Concrete mix design is as per Indian Standards (IS 10262) and might vary from country to country. The nominal mix design ratios available for concrete less than M30 in strength are only thumb rules and are generally over designed. As the actual site conditions vary and the mix design should be adjusted as per the location and other factors.
The compressive strength, flexural strength, and split tensile strength of Reactive Powder concrete are all
investigated in this study (RPC). The lack of ductility in ordinary concrete is considered a key concern in this
research. RPC is being explored as a solution for the aforementioned challenge as the building industry's
technology advances. Cement, sand, water, admixture, and superplasticizer are all included in the RPC. The
reactive powder concrete mixture is made by changing the percentages of super plasticizer (2%, 3% and 4%),
silica fumes (10%, 20%, and 30%), while maintaining the dose of quartz powder constant. At the outset of this
study, compressive strength, flexural strength, and split tensile strength targets of 140-160Mpa, 20-30Mpa, and
15-20Mpa were set. However, due to a change in material qualities that were locally accessible and of low
quality, the results produced after the investigation were unsatisfactory to get the findings, the RPC was mixed,
cast, cured, and tested in the concrete laboratory using three different mix proportions.
150mmX150mmX150mm cube, 500mmX100mmX100mm beam, and 150mm diameter and 300mm height
cylinder are all made of fresh concrete. The casted RPC is then cured in a water tank at room temperature for 7,
14, and 28 days before being oven dried for 24 hours at 60 degrees Celsius. The final results were documented
and discussed, as well as conclusions and recommendations based on the findings.
High-performance fiber-reinforced cementitious composites (HPFRCCs) are a group of fiber-reinforced cement-based composites which possess the unique ability to flex and self-strengthen before fracturing. This particular class of concrete was developed with the goal of solving the structural problems inherent with today’s typical concrete, such as its tendency to fail in a brittle manner under excessive loading and its lack of long-term durability. Because of their design and composition, HPFRCCs possess the remarkable ability to strain harden under excessive loading. In layman’s terms, this means they have the ability to flex or deform before fracturing, a behavior similar to that exhibited by most metals under tensile or bending stresses. Because of this capability, HPFRCCs are more resistant to cracking and last considerably longer than normal concrete. Another extremely desirable property of HPFRCCs is their low density. A less dense, and hence lighter material means that HPFRCCs could eventually require much less energy to produce and handle, deeming them a more economic building material. Because of HPFRCCs’ lightweight composition and ability to strain harden, it has been proposed that they could eventually become a more durable and efficient alternative to typical concrete.
HPFRCCs are simply a subcategory of ductile fiber-reinforced cementititous composites (DFRCCs) that possess the ability to strain harden under both bending and tensile loads, not to be confused with other DFRCCs that only strain harden under bending loads.
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2. Contents
Introduction
Definition
History of Development and Application
Objective
UHPC Constitutes Materials
UHPC Mix Design
UHPC Structural Properties
Comparison of UHPC, HPC, and NSC
Applications
Factor Affecting the Use of UHPC
Future of UHPC
References
3. INTRODUCTION
Ultra-high performance concrete (UHPC) is a new class of
concrete that has been developed in recent decades.
When compared with high performance
concrete (HPC), UHPC tends to exhibit superior properties
such as advanced strength, durability, and long-term
stability.
4. What is UHPC
It is also known as Reactive Powder 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 fibers
5. HISTORY OF DEVELOPMENT
AND APPLICATIONS
In the early 1980s the idea was born to develop fine
grained concretes with a very dense and
homogeneous cement matrix preventing the
development of micro cracks within the structure when
being loaded.
UHPC was established worldwide for concretes with a
minimum compressive strength of 150 N/mm2.
First research and developments aiming at an
application of UHPC in constructions started in about
1985
6. OBJECTIVE
The main concept behind UHPC mixture is to minimize
the number of defects, such as voids and internal micro-
cracks, and to achieve a greater percentage of the
ultimate load capacity of its components
This can be reached by enhancing homogeneity and
increasing the packing density through optimization of
the granular mixture and elimination of coarse
aggregates
7. UHPC CONSTITUENT MATERIALS
Fine Sand (150 and 600 micrometers)
Cement (Diameter 15 micrometer)
Crushed Quartz (Diameter 10 micrometer)
Silica Fume (~1 m)
Super plasticizers (Polycarboxylate derivatives)
Admixtures (Accelerator Rheocrete CNI)
Steel Fibers (Dia. 0.2mm and length 12.7mm)
water
8.
9. DESIGN ASPECTS
For UHPC two similar approaches have been developed-
First Established by AFGC/SETRA in France in 2002 (SETRA-
AFCG 2002)
Second Established as part of the state-of-the-art report of
the DAfStB in Germany in 2003 (DAfStB UHPC 2003).
10. The (SETRA-AFCG 2002) France recommendations consist of
three parts:
The first part gives specifications on the mechanical performance to be
obtained and recommendations for characterizing UHPC including
checks of finished products and of the concrete being produced.
The second part deals with the design and analysis of structures made
with fibre reinforced, non-Prestressed and/or non-reinforced UHPC-
elements.
A third part dealing with the durability of UHPC.
15. STEEL FIBER MATERIAL
PROPERTIES
The intended function of these fibers within UHPC requires
that the fibers have a very high tensile strength.
Minimum Tensile strength- 2600 MPa
Yield Stress = 3150 MPa
Maximum Stress = 3250 MPa
Modulus of Elasticity = 210 GPa
16. Tension tests are performed as a means of quality control on the fiber
production. The stress strain behavior as recorded during one of these
quality control tests is presented in figure.
19. Mixing Technology of UHPC
Conventional mixer types can be used to produce UHPC in the laboratory or
in precast concrete plants.
Compulsory Mixer (volume 75 l)
Ring Mixer (volume 1000 l)
R- Intensive Mixer with Vacuum Periphery:-
The following requirements are placed on the mixer for UHPC
production:
Short mixing duration
Homogeneous blending of small quantities of additives and admixtures
Homogenization of materials having different densities
20. Mixing method of the R-intensive mixer
Ring mixer (mix volume 1000 l)
Mixing method of ZZ 75 HE
21. Mixing times and steps for the compulsory
mixer (75 l)
Time [min]
begin- end
To Do
Dry homogenization or sand and silica fume over 1 min
0 – 1.0 Addition of water
1.0 – 1.75 Addition of mixture of cement and quartz powder
1.75 – 2.5 Addition of 40% super plasticizer within 15 s followed by
homogenization
2.5 – 6.0 Break
6.0 – 7.0 Addition of remaining (60%) super plasticizer and
homogenization
6.0 – 8.0 Continuous addition of steel fibers
22. Comparatively study of NSC,
HPC And UHPC
High Mod.of Elast. More than 40 GPa
Property Normal
Concrete
HPC UHPC
Compressive
Strength
20-40MPa 70-140 MPa 180-225MPa
Flexural strength 3-5MPa 5-9MPa 40-50MPa
Tensile strength 2-5MPa 5-6MPa 12MPa
Density
2240-2400
kg/m3
2350-2500
kg/m3
2440-2550
kg/m3
Modulus of elasticity 25-34GPa 33-44GPa 55-58.5GPa
36. Factors affecting a broader
use of UHPC
Implementation of UHPC progressing slowly for three
reasons:
Lack of design codes for UHPC
Risk perception and lack of familiarity with UHPC
Initial cost The greatest challenge limiting the use of
UHPC
37. future of UHPC
The strength and properties of an UHPC will go in an upwards
direction in the nearly future, 200-500 MPa will be possible
within the next 20 years.
For this it will also be necessary to produce more artificial
made aggregate to be able to reach these high strength.
The use of special polymers like in MDF (micro detect free)
concrete will be interesting again to produce new type of
UHPC.
38. References
Ultra High Performance Concrete: Developments and
Applications during 25 years (September 13 - 15, 2004,
Kassel, Germany. Peter Buitelaar )
Material Property Characterization of Ultra-High Performance
Concrete (PUBLICATION NO. FHWA-HRT-06-103)
Ultra High Performance concrete (FHWA Publication No:
FHWA-HRT-11-038)
Properties of Expansive-Ultra High-Strength Concrete (by M.
Suzuki, I. Maruyama, and R. Sato)
International Symposium on Ultra High Performance
Concrete (Kassel, Germany September 13-15, 2004)
Graybeal, B. (2011). “Ultra High Performance Concrete”,
TechNote, Report No. FHWA-HRT-11038, Federal Highway
Administration, McLean, VA.
39. Pimienta, P and Chanvillard, G. (2004). “Retention of the Mechanical
Performance of Ductal® Specimens Kept in Various Aggressive
Environments”, FIB Symposium 2004, April 26-28, Avignon, France.
Ahlborn, T., Harris, D., Misson, D. and Peuse, E. (2011). “Strength and
Durability Characterization of Ultra-High Performance Concrete Under
Variable Curing Conditions”, TRB 2011 Annual Meeting.
Gao, R. et al. “Mechanical Properties of Reactive Powder Concrete
Beams.” American Concrete Institute. 10 February 2007.
