scholarly journals Towards Efficient Use of Cement in Ultra High Performance Concrete

2021 ◽  
Vol 65 (2) ◽  
pp. 81-105
Author(s):  
Ingrid Lande ◽  
Rein Terje Thorstensen
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Cement Content ◽  
Research Society ◽  
Particle Packing ◽  
Experimental Program ◽  
Inert Material ◽  
Ultra High Performance Concrete ◽  
Flexural Tensile Strength ◽  
By Products

Abstract This paper presents an investigation on substituting the cement content with an inert material, in a typical locally produced UHPC mix. A structured literature review was performed to enrichen the discussion and to benchmark the results towards already reported investigations in the research society. Investigations on cement substitution in UHPC are frequently reported. However, usually the cement is substituted with other binding materials – often pozzolanic by-products from other industries. Reports from investigations on the use of inert materials for cement substitution in UHPC seem scarce. An experimental program that included a total of 210 test specimens was executed. This program included evaluating several questions embedded to the problem on how to substitute cement while keeping all other variables constant. It is concluded that up to 40% of the cement can be substituted with an inert material, without significantly changing the flexural tensile strength or compressive strength of the hardened UHPC. Two preconditions were caretaken: the particle packing was maintained by securing that the substitution material had a Particle Size Distribution (PSD) near identical to the cement and that the water balance was maintained through preconditioning of the substitution material. Suggestions are made for improving benchmarking.

Flexural Behavior of Prestressed UHPC Beams

2011 ◽  
Vol 243-249 ◽  
pp. 1145-1155
Author(s):  
Jian Yang ◽  
Zhi Fang ◽  
Gong Lian Dai
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Strain Curve ◽  
Flexural Behavior ◽  
Experimental Program ◽  
Ultra High Performance Concrete ◽  
Stress Strain ◽  
Flexural Response ◽  
Strain Relationship ◽  
Relationship Of

Ultra High Performance Concrete (UHPC), which has very special properties that are remarkably different to the properties of normal and high performance concrete, is being increasingly used for the construction of structure. In this paper, an experimental program was formulated to investigate the characteristics of complete stress-strain curve of UHPC in uniaxial compression and flexural behaviors of prestressed UHPC beams. The particular focus was the influence of the partial prestress ratio and jacking stress on the flexural response of UHPC beams. The results show that UHPC is of good deformability, and a general form of the serpentine curve is proposed to represent the complete stress-strain relationship of UHPC in compression. The tests of beams demonstrated that the UHPC beams have an excellent behavior in load carrying capacity, crack distribution and deformability, their ultimate deflection can reach 1/34～1/70 of the span. Based on this investigation, theoretical correlations for the prediction structure response of UHPC beam are proposed.

scholarly journals Mechanical, Durability And Rheology Properties Of Ultra High Performance Concrete (UHPC) With Low Cement Content

2021 ◽  
Vol 920 (1) ◽  
pp. 012005
Author(s):  
M Z A M Zahid ◽  
B H A Bakar ◽  
F M Nazri ◽  
H Alasmari ◽  
M F P M Latiff ◽  
...  
Keyword(s):  
High Performance ◽  
Coarse Aggregate ◽  
High Performance Concrete ◽  
Cement Content ◽  
Test Results ◽  
Ultra High Performance Concrete ◽  
Water Penetration ◽  
Slump Flow ◽  
Mechanical Durability ◽  
Penetration Tests

Abstract This current study attempts to investigate the mechanical, durability as well as rheology properties of Ultra-High Performance Concrete (UHPC) with low cement content and using coarse aggregate. The cement content used in UHPC mix in current study was 800 kg/m3. The slump flow, compressive strength, splitting tensile strength, modulus of elasticity, water absorption and water penetration tests were conducted to determine the workability, mechanical and durability properties of explored UHPC mixture. The test results show that the above properties were exceptional and comparable with other UHPC mixtures.

Green ultra-high performance concrete with very low cement content

2021 ◽  
Vol 303 ◽  
pp. 124482
Author(s):  
Ye Shi ◽  
Guangcheng Long ◽  
Xiaohui Zeng ◽  
Youjun Xie ◽  
Huihui Wang
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Cement Content ◽  
Ultra High Performance Concrete

scholarly journals Residual Tensile Stress Estimation for Shear Strength of UHPC Nonprismatic Beams

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Nasser Hakeem Tu’ma ◽  
Mustafa Raad Aziz ◽  
Haider Jabbar J. Barry
Keyword(s):  
Shear Strength ◽  
Tensile Stress ◽  
High Performance ◽  
High Performance Concrete ◽  
Longitudinal Axis ◽  
Steel Fibers ◽  
Experimental Program ◽  
Residual Tensile Stress ◽  
Ultra High Performance Concrete ◽  
Failure Patterns

Abstract Estimating the shear strength of Ultra-High-Performance Concrete (UHPC), with high compressive and tensile strengths, is complicated by many variables that affecting its behavior. Residual tensile stress (RTS) plays an important role in raising the efficiency of both types of resistance, especially shear strength due to the presence of steel fibers, which makes it difficult to quantify the residual tensile stress due to the different failure patterns of these fibers and the distribution mechanism within the concrete matrix. There is no study to date in assessing residual tensile stress of UHPC structural members of the variable section. Thirteen beams were selected as an experimental program to study six main variables in determining shear strength. Stirrups ratio, flexural reinforcement ratio, the volumetric fraction of steel fibers, geometry changing, existing openings along the longitudinal axis, and shear span to depth ratio. According to on Tests results, RTS is compatible with most of the global specifications.

New Connection Detail to Connect Precast Column to Cap Beam using Ultra-High-Performance Concrete in Accelerated Bridge Construction Applications

2018 ◽  
Vol 2672 (41) ◽  
pp. 207-220 ◽  
Author(s):  
Mohamadreza Shafieifar ◽  
Mahsa Farzad ◽  
Atorod Azizinamini
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Precast Concrete ◽  
Experimental Program ◽  
Accelerated Bridge Construction ◽  
Ultra High Performance Concrete ◽  
Bridge Construction ◽  
Construction Time ◽  
Element Analysis ◽  
Displacement Ductility

Accelerated bridge construction (ABC) is a paradigm change in delivery of bridges. ABC minimizes the traffic interruption, enhances safety to public and workers by significantly reducing on-site construction activities, and results in longer-lasting bridges. The use of precast elements is gaining attention owing to inherent benefits of accelerated construction. Designing an economical connection is one of the main concerns for these structures. New improved materials such as ultra-high-performance concrete (UHPC) with superior characteristics can provide solutions for joining precast concrete elements. In this paper two types of column to cap beam connection using UHPC are proposed for seismic and non-seismic regions. Among the merits of the proposed details, large tolerances in construction and simplicity of the connection can be highlighted which facilitates and accelerates the on-site construction time. The experimental program was carried out to evaluate the performance and structural behavior of the proposed connections. Four specimens were subjected to constant axial compressive loads and cyclic lateral loading. Results of the experiment showed that the displacement ductility of the specimens, incorporating suggested details, demonstrated adequate levels of displacement ductility. More importantly, the proposed connections prevented the damage into capacity protected element—in this case the cap beam. Analytical and nonlinear finite element analysis on the specimens was carried out to better comprehend the behavior of the proposed connections.

Behavior of Prestressed Ultra High Performance Concrete Beams

2008 ◽  
Vol 400-402 ◽  
pp. 385-390 ◽  
Author(s):  
Jian Yang ◽  
Zhi Fang
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Strain Curve ◽  
Experimental Program ◽  
Load Carrying Capacity ◽  
Ultra High Performance Concrete ◽  
Stress Strain Curve ◽  
Structure Response ◽  
Flexural Response ◽  
Load Carrying

An experimental program was formulated to investigate the characteristics of complete stress-strain curve of UHPC in uniaxial compression and flexural behaviors of prestressed UHPC beams. The particular focus was the influence of the partial prestress ratio and jacking stress on the flexural response of UHPC beams. The tests of beams demonstrated that the UHPC beams have an excellent behavior in load carrying capacity, crack distribution and deformability; their ultimate deflection can reach 1/34～1/42 of the span. Based on this investigation, theoretical correlations for the prediction structure response of UHPC beams are proposed.

scholarly journals Effect of Fiber, Cement, and Aggregate Type on Mechanical Properties of UHPC

2021 ◽  
Vol 7 (8) ◽  
pp. 1290-1309
Author(s):  
Esmail Shahrokhinasab ◽  
Trevor Looney ◽  
Royce Floyd ◽  
David Garber
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
High Performance ◽  
High Performance Concrete ◽  
Particle Packing ◽  
High Price ◽  
Accelerated Bridge Construction ◽  
Ultra High Performance Concrete ◽  
New Class ◽  
The Us

Ultra-High Performance Concrete (UHPC) is a new class of concrete that differentiates itself from other concrete materials due to its exceptional mechanical properties and durability. It has been used in structural rehabilitation and accelerated bridge construction, structural precast applications, and several other applications in the past decades. The mechanical properties of UHPC include compressive strength greater than 124 MPa (18 ksi) and sustained post cracking tensile strength greater than 5 MPa (0.72 ksi) when combined with steel, synthetic or organic fibers. Proprietary, pre-bagged mixtures are currently available in the market, but can cost about 20 times more than traditional concrete. This high price and the unique mixing procedure required for UHPC has limited its widespread use in the US and has motivated many researchers to develop more economical versions using locally available materials. The objective of this study was to investigate the effect of different proportions of typical UHPC mixture components on the mechanical properties of the mixtures. Particle packing theory was used to determine a few optimal mixture proportions and then modifications were made to investigate the effect. A compressive strength of around 124 MPa (18 ksi) was achieved without using any quartz particles in the mixture design. Doi: 10.28991/cej-2021-03091726 Full Text: PDF

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