On the measurement of free deformation of early age cement paste and concrete

Bjøntegaard, Øyvind; Hammer, Tor Arne; Sellevold, Erik J.

doi:10.1016/s0958-9465(03)00065-9

Cited by 66 publications

(25 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The autogenous shrinkage of the tested UHPFRC is two times lower at same age than that measured on cement paste with W/C = 0.4 and containing 5% of silica fume [24] and that measured on high performance concrete with W/ B = 0.25 and containing 10% of silica fume [4]. This moderate autogenous shrinkage is attributed to the low degree of hydration (about 30% after 90 days).…”

Section: Testing Proceduresmentioning

confidence: 85%

Thermo-mechanical response of UHPFRC at early age — Experimental study and numerical simulation

Kamen

Denarié

Sadouki

et al. 2008

Cement and Concrete Research

View full text Add to dashboard Cite

The thermal effects on the Ultra High Performance Fiber Reinforced Concrete (UHPFRC) behavior are still not completely known. Under high temperatures, the processes that interact at early age are thermo-activated. All the experimental results obtained within this research confirmed it. Besides, certain authors observed a non-monotonous effect of temperature on the autogenous shrinkage and the creep of normal and high performance concretes. To clarify the thermal effect on the early age UHPFRC behavior an extensive experimental study was carried out. Tests results showed a non-monotonous effect of temperature on the autogenous shrinkage. In addition, finite element numerical simulations were performed to predict the experimental results and to validate existing models for different curing conditions. These models are necessary to predict accurately the deformations, the stresses and the damage (cracking) in the case of structural elements subjected to in-situ temperature variations.

show abstract

Section: Testing Proceduresmentioning

confidence: 85%

Thermo-mechanical response of UHPFRC at early age — Experimental study and numerical simulation

Kamen

Denarié

Sadouki

et al. 2008

Cement and Concrete Research

View full text Add to dashboard Cite

show abstract

“…It is believed that the difference between the various measuring methods is largely responsible for variations in results. Table 10 summarises the common methods for measuring early-age shrinkage and their main features (Bjøntegaard et al, 2004;Gagné et al, 1999;Gary-Ong and Myint-Lay, 2006;Glišic and Simon, 2000;Hansen and Jensen, 1997;Igarashi and Kawamura, 2002;Jensen and Hansen, 1995;Lee et al, 2003;Lokhorst, 1999;Lura and Jensen, 2007;Østergaard and Jensen, 2003;Slowik et al, 2004;Tazawa, 1999;Termkhajornkit et al, 2005;Turcry and Loukili, 2006).…”

Section: Autogenous Shrinkagementioning

confidence: 99%

Early-age properties of concrete: overview of fundamental concepts and state-of-the-art research

Nehdi

Soliman

2011

Proceedings of the Institution of Civil Engineers - Constructio

View full text Add to dashboard Cite

The long-term performance of concrete structures is affected to a large extent by the properties and behaviour of concrete at early age. However, the fundamental mechanisms affecting the early-age behaviour of concrete have not yet been fully understood. This is due to the various highly interrelated factors influencing it, and the complexity of testing techniques needed for its investigation. With modern developments in concrete technology, it has become essential to evaluate the influence of these interrelated factors and their implications for the service life of concrete structures. Thus, a more fundamental approach for investigating the early-age behaviour of concrete, along with more reliable testing techniques, is required. This paper provides a critical overview of research on the mechanisms that affect the properties of concrete and its performance at early age. It provides useful, concise and coherent information on the behaviour of concrete at early age, which should enhance the understanding of the implications of such behaviour on the service life performance of concrete structures. Notationreal compliance function k, n relation coefficients k d thermal diffusivity (m 2 /s) T a average concrete temperature during the time interval Dt T 0 datum temperature v(r)Poison's ratio at a degree of hydration r Dt time interval e autogenous (t, t9) autogenous shrinkage strain at time t e total (t, t9) total strain of a concrete specimen measured from the basic creep test at time t caused by an amount of constant stress applied at age t9 k thermal conductivity (W/(m.K)) r bulk density (kg/m 3 ) s total applied stress s c concrete strength

show abstract

“…Cementitious mortar mixtures proportioned with low waterto-cementitious materials ratio (w/cm) develop not only high strength and stiffness but also significant early-age shrinkage [1]. Shrinkage-induced cracks in reinforced concrete structures [2] can increase the ingress of water and chloride ions that can lead to corrosion of the steel reinforcement, resulting in accelerated structural degradation, particularly in maritime environment [3].…”

Section: Introductionmentioning

confidence: 99%

Measuring mortar shrinkage and cracking by pulse pre-pump Brillouin optical time domain analysis with a single optical fiber

et al. 2015

View full text Add to dashboard Cite

On the measurement of free deformation of early age cement paste and concrete

Cited by 66 publications

References 5 publications

Thermo-mechanical response of UHPFRC at early age — Experimental study and numerical simulation

Thermo-mechanical response of UHPFRC at early age — Experimental study and numerical simulation

Early-age properties of concrete: overview of fundamental concepts and state-of-the-art research

Measuring mortar shrinkage and cracking by pulse pre-pump Brillouin optical time domain analysis with a single optical fiber

Contact Info

Product

Resources

About