Effects of Steam Curing Temperature on Early Prestress Losses in High-Performance Concrete Beams

2002 ◽  
Vol 1813 (1) ◽  
pp. 218-228 ◽  
Author(s):  
Rola L. Idriss ◽  
Amor Solano
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Concrete Beams ◽  
Curing Temperature ◽  
Steam Curing ◽  
Prestress Losses

Effect of Curing Conditions on Property of High Performance Concrete with Composite Mineral Admixture

2008 ◽  
Vol 400-402 ◽  
pp. 409-414
Author(s):  
Ling Li Gong ◽  
Nan Guo Jin ◽  
Xiang Lin Gu ◽  
Xian Yu Jin
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Concrete Strength ◽  
Chloride Penetration ◽  
Mineral Admixture ◽  
Curing Temperature ◽  
Steam Curing ◽  
Curing Conditions ◽  
Study Test ◽  
Curing Condition

In this paper, the development of cubic compressive strength of concrete with the age was studied first. Four kinds of concrete, which were made from the mixes by using 0%, 20%, 30% and 40% Composite Mineral Admixture (CMA) as the replacement of the cement for each kind of concrete, were used in the study. Test results showed that the concrete with 30% CMA had the best properties compared with others both under standard-curing condition and steam-curing condition. Furthermore, the normal concrete (without CMA ) and the high performance concrete (with 30% CMA) were chosen as the main materials in comparative tests to study the effect of curing conditions on the property of high performance concrete, such as the basic mechanical properties, the property against chloride penetration, and the property against carbonization. The results indicated that the curing temperature would increase the concrete strength in early age but not in long term. The curing condition would affect the property of concrete against carbonization but not the property of concrete against chloride penetration obviously.

Integrated High-Performance Concrete Beams Reinforced with Hybrid BFRP and Steel Bars

2022 ◽  
Vol 148 (1) ◽  
Author(s):  
Xin Wang ◽  
Shui Liu ◽  
Yuwei Shi ◽  
Zhishen Wu ◽  
Weidong He
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Concrete Beams ◽  
Steel Bars

Research on the Problems and Countermeasures for Steam Curing of Assembled Composite Wallboard

2014 ◽  
Vol 580-583 ◽  
pp. 2299-2302
Author(s):  
Chun Yi Xu ◽  
Lei Yan ◽  
Chen Li ◽  
Zhi Wei Cao
Keyword(s):  
Field Test ◽  
Production Line ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Durability ◽  
Steam Curing ◽  
Volume Stability ◽  
Actual Production

For researching principle and production line state of steam curing of composite wallboard, the art have been conducted through actual investigation and field test. Based on the influence of steam curing on the strength of high performance concrete, durability and volume stability, put forward suggestions of steam curing system; Several problems have been raised for steam curing in the actual production, then some correlative improve measurements are given. Provide the reference for the production and development of the residential part in our country.

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.

Structural Design of High-Performance Concrete Bridge Beams

2000 ◽  
Vol 1696 (1) ◽  
pp. 171-178
Author(s):  
Xiaoming (Sharon) Huo ◽  
Maher K. Tadros
Keyword(s):  
Structural Design ◽  
High Performance ◽  
High Performance Concrete ◽  
Highway Bridges ◽  
Major Effect ◽  
Minor Effect ◽  
Bottom Flange ◽  
Prestress Losses ◽  
Bridge Beams ◽  
Creep And Shrinkage

Recently high-performance concrete (HPC) has been used in highway bridges and has gained popularity for its short-term and prospective long-term performances. Benefits of using HPC include fewer girder lines required, longer span capacity of girders, reduced creep and shrinkage deformation, less prestress losses, longer life cycle, and less maintenance of bridges. Research has been conducted on several issues of structural design of HPC bridge beams. The topics discussed include the effects of section properties of prestressed concrete girders, allowable tensile and compressive stresses, creep and shrinkage deformations of HPC, and prediction of prestress losses with HPC. The results from a parametric study have shown that a section that can have a large number of strands placed in its bottom flange is more suitable for HPC applications. The use of 15-mm-diameter prestressing strands allows the higher prestressing force applied on sections and can provide more efficiency in HPC bridges. The research results also indicate that the allowable compressive strength of HPC has a major effect on the structural design of bridges, whereas the allowable tensile stress has a minor effect on the design. Equations for predicting prestress losses based on the experimental and analytical results are recommended. The recommended equations consider the effects of lower creep and shrinkage deformations of HPC.

Numerical investigation of the shear behavior of reinforced ultra-high-performance concrete beams

2017 ◽  
Vol 19 (1) ◽  
pp. 305-317 ◽  
Author(s):  
Sifatullah Bahij ◽  
Saheed K. Adekunle ◽  
Mohammed Al-Osta ◽  
Shamsad Ahmad ◽  
Salah U. Al-Dulaijan ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Beams ◽  
Shear Behavior ◽  
Ultra High Performance Concrete
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