Development of a new experimental technique for the study of the autogenous shrinkage of cement paste

Gagné, Richard; Aouad, I.; Shen, Jiyun; Poulin, Carina

doi:10.1007/bf02481701

Cited by 14 publications

(4 citation statements)

References 4 publications

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“…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

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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

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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

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“…This value rose to a value of 450 and 900 µm/m at 10 and 45 days, respectively. This was due to the pozzolanic reactions of the LF, which led to an increase in autogenous shrinkage [26,63,68,69].…”

Section: Expansionmentioning

confidence: 99%

Volume Stability of Cement Paste Containing Limestone Fines

et al. 2021

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The common cause of cracking in cement paste is shrinkage due to different reasons, such as loss of water and chemical reactions. Incorporating limestone fines (LF) as a cement replacement can affect the shrinkage of the paste. To examine this effect, five paste mixes were prepared with 0, 5, 10, 15 and 20% LF as a cement replacement and with a water-to-binder ratio (w/b) of 0.45. Four volume stability tests were conducted for each paste: chemical, autogenous and drying shrinkage and expansion. Chemical shrinkage was tested each hour for the first 24 h and thereafter every 2 days for a total period of 90 days. The drying shrinkage, autogenous shrinkage and expansion were monitored every 2 days until 90 days. The results showed that replacing 15% LF enhanced the chemical shrinkage of the paste. However, autogenous shrinkage of the paste was found to increase between 0 and 10% LF and decline sharply at 15 and 20% LF. Drying shrinkage was found to increase with the increase in LF content. Expansion exhibited little variation between 0 and 10% LF and an increase for replacement above 15% LF. These results are discussed in terms of the formation of hydration products and self-desiccation due to hydration.

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“…The absolute volume of the solid phase in the process of cement hydration is increasing, but the sum of the volume of the solid phase and liquid phase decreases, this part of the volume is reduced values called chemical reduction. In the hydration reaction of the process, due to the chemical reduction effect, hydration of cementitious material system in the original water-occupied part of the space is filled by the hydration products, the another portion of the formation of voids, so that the chemical reduction caused by the volume shrinkage is divided into internal shrinkage andexternal shrinkage of two parts [7]. Corresponding concrete internal relative humidity decreases as the level drops during this process, so that the concrete dry phenomenon is internally generated from external environmental influence, so that this shrinkage also called self-drying shrinkage.…”

Section: The Mechanism Of Autogenous Shrinkagementioning

confidence: 99%

Research Progress on Early Autogenous Shrinkage of Cement-Based Cementitious Materials

Huang¹,

Zhang²,

Xu³

2013

AMR

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Concrete autogenous shrinkage phenomenon would adversely affect the mechanical properties and durability of concrete, this phenomenon is important. Autogenous shrinkage problem of low water-cement ratio of the with high mineral admixtures, cement-based cementitious materials was introduced. The main reason for high-performance concrete early cracking being autogenous shrinkage was pointed out. Based on the home and abroad research status of low water cement ratio of the cement paste and concrete autogenous shrinkage, especially for early autogenous shrinkage phenomenon, the mechanism of autogenous shrinkage and the measure method is presented, and the improvement measures and the possible problems the need for further research work is presented.

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Development of a new experimental technique for the study of the autogenous shrinkage of cement paste

Cited by 14 publications

References 4 publications

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

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

Volume Stability of Cement Paste Containing Limestone Fines

Research Progress on Early Autogenous Shrinkage of Cement-Based Cementitious Materials

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