Implementation of High Strength-High Performance Concrete in Two Texas Highway Overpass Structures: Critical Comparison

2000 ◽  
Vol 1696 (1) ◽  
pp. 179-187 ◽  
Author(s):  
Shawn P. Gross ◽  
Ned H. Burns
Keyword(s):  
Life Cycle ◽  
Prestressed Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Life Cycle Costs ◽  
Construction Costs ◽  
Conventional Concrete ◽  
The North ◽  
Maintenance Requirements

Two prestressed concrete highway overpass structures, the Louetta Road Overpass and the North Concho River Overpass, were recently constructed in Texas. The structures were built with high strength–high performance concrete (HS-HPC) with nominal strengths of up to 61 MPa (8,800 psi) at release of prestress and 97 MPa (14,000 psi) at 56 days. The use of HS-HPC, in addition to the use of prestressing strands that measured 15 mm (0.6 in.) in diameter, allowed for the accommodation of longer spans and larger girder spacing than are typical for similar designs with conventional concrete. As a result, the structural designs were extremely efficient when compared with the conventional designs. In addition, use of HPC in bridge decks is expected to result in reduced maintenance requirements and a longer service life for each bridge, thereby reducing life-cycle costs. Although HPC is used in both structures to increase structural efficiency and reduce projected life-cycle costs, the structures are quite different and represent unique applications of HPC. Both structures were instrumented as part of an extensive research program, and data were collected on prestress losses, camber and deflections, concrete strains, and concrete temperatures in several actual bridge girders. These data, in combination with observations regarding practical issues such as fabrication, handling, and overall construction costs, are used to compare and contrast the use of HPC in the two bridges. A brief set of recommendations for the use of HPC in future highway bridge projects is also presented.

An Experiment on the Bond-Slip Behaviors of Pre-Tensioned Prestressed UHPC Members

2016 ◽  
Vol 878 ◽  
pp. 161-164
Author(s):  
Jee Sang Kim ◽  
Dong Hun Choi
Keyword(s):  
Prestressed Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Ultra High Performance Concrete ◽  
Conventional Concrete ◽  
Bond Slip ◽  
Optimum Utilization ◽  
Bond Strengths ◽  
Very High

An Ultra High Performance Concrete (UHPC) exhibits very high compressive and tensile strength and excellent durability comparing to those of the conventional concrete. The applications of UHPC to precast and/or prestressed concrete result the optimum utilization of high strength characteristics. This paper experimentally investigates the bond-slip behaviors between prestressing strands and UHPC in pretnesioned members. The diameters of strands, 12.7mm and 15.2mm, the cover depths and tensioning forces are chosen as variables, which are known to affect the bond behaviors. The bond-slip curves for various specimens are obtained and the equations for bond strengths of UHPC are derived based on experiments.

scholarly journals Abrasion Resistance of Ultra-High-Performance Concrete for Railway Sleepers

2021 ◽  
Author(s):  
Ariful Hasnat ◽  
Nader Ghafoori
Keyword(s):  
Prestressed Concrete ◽  
Abrasion Resistance ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Positive Influence ◽  
Cementitious Material ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Ultra High Performance Concrete

AbstractThis study aimed to determine the abrasion resistance of ultra-high-performance concretes (UHPCs) for railway sleepers. Test samples were made with different cementitious material combinations and varying steel fiber contents and shapes, using conventional fine aggregate. A total of 25 UHPCs and two high-strength concretes (HSCs) were selected to evaluate their depth of wear and bulk properties. The results of the coefficient of variation (CV), relative gain in abrasion, and abrasion index of the studied UHPCs were also obtained and discussed. Furthermore, a comparison was made on the resistance to wear of the selected UHPCs with those of the HSCs typically used for prestressed concrete sleepers. The outcomes of this study revealed that UHPCs displayed excellent resistance against abrasion, well above that of HSCs. Amongst the utilized cementitious material combinations, UHPCs made with silica fume as a partial replacement of cement performed best against abrasion, whereas mixtures containing fly ash showed the highest depth of wear. The addition of steel fibers had a more positive influence on the abrasion resistance than it did on compressive strength of the studied UHPCs.

Prestress Loss Measurements in Missouri's First Fully Instrumented High-Performance Concrete Bridge

2005 ◽  
Vol 1928 (1) ◽  
pp. 118-125 ◽  
Author(s):  
Yumin Yang ◽  
John J. Myers
Keyword(s):  
Prestressed Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Concrete Bridge ◽  
Prestress Loss ◽  
Prestress Losses ◽  
Concrete Girders ◽  
Allowable Stresses ◽  
Loss Estimate

Prestress losses have a direct impact on concrete stress development and deflection behavior of highway bridge members. A poor estimate of prestress losses can result in a structure in which allowable stresses are exceeded or camber and deflection behavior is poorly predicted, such that the serviceability of a structure may be adversely affected. This paper reports the prestress losses observed throughout fabrication, shipment, erection, and the first 2 years of service for the first high-performance superstructure concrete bridge in Missouri. The prestress losses investigated included prerelease losses, elastic shortening losses, relaxation losses, creep losses, and shrinkage losses. Results from the study were compared with eight commonly used loss estimate models for total prestress losses, including AASHTO and Prestressed Concrete Institute methods. Recommendations were proposed by the authors for the most appropriate methodology to use to predict prestress losses in high-strength concrete girders accurately.

Optimization of Structural Design for High-Performance Concrete Bridges

1998 ◽  
Vol 1624 (1) ◽  
pp. 132-139
Author(s):  
Mary Lou Ralls ◽  
Ramon L. Carrasquillo ◽  
Ned H. Burns
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Cost Effective ◽  
Concrete Bridges ◽  
Practical Guidelines ◽  
Improved Performance ◽  
Maintenance Requirements ◽  
Design And Construction

High-performance concrete (HPC) bridges can be cost-effective both initially and in the long term, provided the design and construction optimize the improved performance characteristics of HPC. Using the high-strength characteristic of HPC can reduce the required number and size of beams. Using the improved durability characteristics of HPC can reduce maintenance requirements and extend the service life. Practical guidelines help design and construction engineers implement HPC in bridges.

scholarly journals Ground Glass Pozzolan in Conventional, High, and Ultra-High Performance Concrete

2018 ◽  
Vol 149 ◽  
pp. 01005 ◽  
Author(s):  
Arezki Tagnit-Hamou ◽  
Ablam Zidol ◽  
Nancy Soliman ◽  
Joris Deschamps ◽  
Ahmed Omran
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Ground Glass ◽  
Strengthening Effect ◽  
Ultra High Performance Concrete ◽  
Conventional Concrete ◽  
Supplementary Cementitious Material ◽  
Pozzolanic Material ◽  
And Performance

Ground-glass pozzolan (G) obtained by grinding the mixed-waste glass to same fineness of cement can act as a supplementary-cementitious material (SCM), given that it is an amorphous and a pozzolanic material. The G showed promising performances in different concrete types such as conventional concrete (CC), high-performance concrete (HPC), and ultra-high performance concrete (UHPC). The current paper reports on the characteristics and performance of G in these concrete types. The use of G provides several advantages (technological, economical, and environmental). It reduces the production cost of concrete and decrease the carbon footprint of a traditional concrete structures. The rheology of fresh concrete can be improved due to the replacement of cement by non-absorptive glass particles. Strength and rigidity improvements in the concrete containing G are due to the fact that glass particles act as inclusions having a very high strength and elastic modulus that have a strengthening effect on the overall hardened matrix.

scholarly journals State of the Art: Mechanical Properties of Ultra-High Performance Concrete

2017 ◽  
Vol 3 (3) ◽  
pp. 190-198 ◽  
Author(s):  
Mohamadtaqi Baqersad ◽  
Ehsan Amir Sayyafi ◽  
Hamid Mortazavi Bak
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
State Of The Art ◽  
High Strength ◽  
Structural Members ◽  
Ultra High Performance Concrete ◽  
Conventional Concrete ◽  
The Past ◽  
Very High

During the past decades, there has been an extensive attention in using Ultra-High Performance Concrete (UHPC) in the buildings and infrastructures construction. Due to that, defining comprehensive mechanical properties of UHPC required to design structural members is worthwhile. The main difference of UHPC with the conventional concrete is the very high strength of UHPC, resulting designing elements with less weight and smaller sizes.  However, there have been no globally accepted UHPC properties to be implemented in the designing process. Therefore, in the current study, the UHPC mechanical properties such as compressive and tensile strength, modulus of elasticity and development length for designing purposes are provided based on the reviewed literature. According to that, the best-recommended properties of UHPC that can be used in designing of UHPC members are summarized. Finally, different topics for future works and researches on UHPC’s mechanical properties are suggested.

Defects of Conventional Concrete and Developments of Self Compacting Concrete along with its Applications

2011 ◽  
Vol 250-253 ◽  
pp. 761-764 ◽  
Author(s):  
Zan Zhi Wang ◽  
Franciscus Xaverius Supartono
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Concrete Structures ◽  
High Strength ◽  
Construction Site ◽  
Self Compacting Concrete ◽  
Conventional Concrete ◽  
Cable Stayed Bridge ◽  
Time Required ◽  
Large Sections

The obstacles met during the production and construction of High Strength Concrete (HSC) and High Performance Concrete (HPC) are analyzed, then the poly-carboxylate based admixture is studied in detail. After that, presents the trend of using Self Compacting Concrete (SCC) to improve the performance of concrete structures, i.e. its durability and reliability, because its highly flowing nature makes it suitable for placing concrete in difficult conditions and sections, especially with crowded steel reinforcement. Utilization of SCC can also reduce the time required for placing large sections in concrete structures, e.g. in the basement or substructure’s concrete pouring. SCC may also minimize the noises on the construction site that are induced by concrete vibrators. Accompanying the presentation of the performance of SCC, its applications in the recently completed Grand Wisata Cable Stayed Bridge designed by the Authors are also introduced.

scholarly journals Innovative design approach of precast–prestressed girder bridges using ultra high performance concrete

2010 ◽  
Vol 37 (4) ◽  
pp. 511-521 ◽  
Author(s):  
H. Almansour ◽  
Z. Lounis
Keyword(s):  
Prestressed Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Slab ◽  
High Strength ◽  
Design Approach ◽  
Highway Bridge ◽  
Efficient Design ◽  
Ultra High Performance Concrete ◽  
Prestressed Concrete Girders

The construction of new bridges and the maintenance and renewal of aging highway bridge network using ultra high performance concrete can lead to the construction of long life bridges that will require minimum maintenance resulting in low life cycle costs. Ultra high performance concrete (UHPC) is a newly developed concrete material that provides very high strength and very low permeability to aggressive agents such as chlorides from de-icing salts or seawater. Ultra high performance concrete could enable major improvements over conventional high performance concrete (HPC) bridges in terms of structural efficiency, durability, and cost-effectiveness over the long term. A simplified design approach of concrete slab on UHPC girders bridge using the Canadian Highway Bridge Design code and the current recommendations for UHPC design is proposed. An illustrative example demonstrates that the use of UHPC in precast–prestressed concrete girders yields a more efficient design of the superstructure where considerable reduction in the number of girders and girder size when compared to conventional HPC girders bridge with the same span length. Hence, UHPC results in a significant reduction in concrete volume and then weight of the superstructure, which in turn leads to significant reduction in the dead load on the substructure, especially for the case of aging bridges, thus improving their performance.

scholarly journals Environmental Assessment of Ultra-High-Performance Concrete Using Carbon, Material, and Water Footprint

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 851 ◽  
Author(s):  
Husam Sameer ◽  
Viktoria Weber ◽  
Clemens Mostert ◽  
Stefan Bringezu ◽  
Ekkehard Fehling ◽  
...  
Keyword(s):  
Life Cycle ◽  
Environmental Impacts ◽  
Environmental Assessment ◽  
Carbon Material ◽  
High Performance ◽  
Water Footprint ◽  
High Performance Concrete ◽  
Construction Materials ◽  
Ultra High Performance Concrete ◽  
Conventional Concrete

There is a common understanding that the environmental impacts of construction materials should be significantly reduced. This article provides a comprehensive environmental assessment within Life Cycle Assessment (LCA) boundaries for Ultra-High-Performance Concrete (UHPC) in comparison with Conventional Concrete (CC), in terms of carbon, material, and water footprint. Environmental impacts are determined for the cradle-to-grave life cycle of the UHPC, considering precast and ready-mix concrete. The LCA shows that UHPC has higher environmental impacts per m3. When the functionality of UHPC is considered, at case study level, two design options of a bridge are tested, which use either totally CC (CC design) or CC enhanced with UHPC (UHPC design). The results show that the UHPC design could provide a reduction of 14%, 27%, and 43% of carbon, material, and water footprint, respectively.

scholarly journals Influence of curing procedures and porosity in the flexural resistance of concretes for paving

2010 ◽  
Vol 3 (4) ◽  
pp. 391-395
Author(s):  
T.C. Cervo ◽  
J.T. Balbo ◽  
M. Badawy ◽  
A.A. Severi
Keyword(s):  
Flexural Strength ◽  
High Strength Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Concrete Surface ◽  
Conventional Concrete ◽  
Curing Conditions ◽  
Strength Concrete ◽  
Flexural Resistance

Flexural strength of high performance concrete submitted to several non-standard curing conditions was evaluated through bending tests on beams in order to allow comparisons among different curing procedures. The moist curing process resulted more effective than curing by chemical products leading to membrane formation over concrete surface; moreover, flexural strength of high strength concrete was increased when satu- rated specimens were tested, whereas conventional concrete flexural strength decreased when submitted to the same conditions. Such results were explained on the basis of concrete porosity with the support of air permeability tests. Results explained differences between the behavior of conventional and high strength concrete when water fills the specimen pores. As recommendation, high strength concrete specimens shall not be tested in bending in saturated condition under the risk of overestimation of flexural resistance.

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