Superplasticizer effects on setting and structuration mechanisms of ultrahigh-performance concrete

Morin, Vincent; Tenoudji, Frédéric Cohen; Feylessoufi, A.; Richard, P.

doi:10.1016/s0008-8846(00)00428-2

Cited by 79 publications

(33 citation statements)

References 2 publications

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“…Generally, the reported setting time of UHPC ranged from 6 to 12 h depending on the mixture design (Richard and Cheyrezy 1995;Yoo et al 2013;Kazemi and Lubell 2012). However, some studies (Brown 2006;Graybeal 2007;Habel 2004;Morin et al 2001) showed that the setting time for UHPC can be delayed for up to 30-40 h due to the set retarding effect of high SP dosage. Furthermore, it was observed that surface covering of freshly mixed UHPC delayed its setting time (Yoo et al 2013).…”

Section: Setting Timementioning

confidence: 99%

Ultra-High Performance Concrete: Mechanical Performance, Durability, Sustainability and Implementation Challenges

Abbas

Nehdi

Saleem

2016

Int J Concr Struct Mater

336

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In this study, an extensive literature review has been conducted on the material characterization of UHPC and its potential for large-scale field applicability. The successful production of ultra-high performance concrete (UHPC) depends on its material ingredients and mixture proportioning, which leads to denser and relatively more homogenous particle packing. A database was compiled from various research and field studies around the world on the mechanical and durability performance of UHPC. It is shown that UHPC provides a viable and long-term solution for improved sustainable construction owing to its ultrahigh strength properties, improved fatigue behavior and very low porosity, leading to excellent resistance against aggressive environments. The literature review revealed that the curing regimes and fiber dosage are the main factors that control the mechanical and durability properties of UHPC. Currently, the applications of UHPC in construction are very limited due to its higher initial cost, lack of contractor experience and the absence of widely accepted design provisions. However, sustained research progress in producing UHPC using locally available materials under normal curing conditions should reduce its material cost. Current challenges regarding the implementation of UHPC in full-scale structures are highlighted. This study strives to assist engineers, consultants, contractors and other construction industry stakeholders to better understand the unique characteristics and capabilities of UHPC, which should demystify this resilient and sustainable construction material.

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Section: Setting Timementioning

confidence: 99%

Ultra-High Performance Concrete: Mechanical Performance, Durability, Sustainability and Implementation Challenges

Abbas

Nehdi

Saleem

2016

Int J Concr Struct Mater

336

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“…It showed that the longer setting times of UPOFA concrete was due to the pozzolanic reaction between pozzolan and calcium hydroxide Ca(OH) 2 , which was usually slower than the hydration of OPC. On the other hand, Morin et al (2001) reported that the overall effect of superplasticizer was to delay the setting times of concrete and the extent of delay depended largely on the type and dosage of superplasticizer, type of cement and temperature. Figure 4 presents the results of the compressive strength of the UHSC mixtures.…”

Section: Setting Timesmentioning

confidence: 99%

Improving the Engineering and Fluid Transport Properties of Ultra-High Strength Concrete Utilizing Ultrafine Palm Oil Fuel Ash

Mohammed

Johari

Zeyad

et al. 2014

ACT

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Ground treated ultrafine-POFA obtained from palm oil industry was heat-treated to remove excess carbon. The varied proportion (17%, 30% and 40%) of UPOFA was incorporated into the ultra-high strength concrete (UHSC) to study its effects on the UPOFA-UHSC (U x -UHSC) in comparison with OPC-UHSC (U 0 -UHSC) engineering and transport properties. The U x -UHSC has an increasing workability tendency with a retarded setting times as compared to U 0 -UHSC. Besides, U x -UHSC registered higher compressive strength than the U 0 -UHSC. The 90-d strength of 156 MPa was achieved in U 17 -UHSC which was 4.7%, 7.5% and 12.2% higher than the values obtained for U 30 -UHSC, U 40 -UHSC and U 0 -UHSC, respectively. The U 40 -UHSC exhibited the greatest improvement at 90 days in transport properties such as porosity, water absorption, initial surface absorption, rapid chloride permeability, gas permeability and water permeability while the highest strength was recorded with U 17 -UHSC. Thus, the pozzolanic UPOFA is capable of improving the engineering and transport properties of UHSC.

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“…In addition to the above-mentioned studies, there are also several studies that measured and utilized the reflection coefficient of shear waves for the evaluation of cementitious materials in early ages (Valic 2000, Morin 2001, Smith 2002, Voigt 2004. Voigt et al (2005) compared longitudinal ultrasonic wave velocities with in-situ temperature rises or adiabatic heat releases.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive Evaluation of Setting and Hardening of Cement Paste Based on Ultrasonic Propagation Characteristics

Kamada

Uchida

Rokugo

2005

ACT

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This paper describes the relationship between the setting/hardening properties of cement paste and ultrasonic propagation characteristics from both a macroscopic and a microscopic point of view. The first experimental series was aimed at evaluating changes in the physical properties of high-early-strength cement paste. In the experiment, a single cylinder rotational viscometer was used for viscosity measurement. The second series of experiments was aimed at evaluating changes in the chemical properties of ultra-rapid-hardening cement paste. In the experiment, scanning electron microscopy (SEM) and powder X-ray diffraction analysis were done to investigate the generation of hydration products. As a result, it was confirmed that the maximum amplitude of the obtained waveform adequately reflects the changes in shear resistance of cement paste. On the other hand, change in ultrasonic wave velocity is well correlated with the formation of ettringite crystals as observed by SEM and powder X-ray diffraction analysis.

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Superplasticizer effects on setting and structuration mechanisms of ultrahigh-performance concrete

Cited by 79 publications

References 2 publications

Ultra-High Performance Concrete: Mechanical Performance, Durability, Sustainability and Implementation Challenges

Ultra-High Performance Concrete: Mechanical Performance, Durability, Sustainability and Implementation Challenges

Improving the Engineering and Fluid Transport Properties of Ultra-High Strength Concrete Utilizing Ultrafine Palm Oil Fuel Ash

Nondestructive Evaluation of Setting and Hardening of Cement Paste Based on Ultrasonic Propagation Characteristics

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