Influence of temperature on autogenous deformation and relative humidity change in hardening cement paste

Jensen, Ole Mejlhede; Hansen, Poul Henrik Kyvsgaard

doi:10.1016/s0008-8846(99)00021-6

Cited by 155 publications

(75 citation statements)

References 4 publications

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“…This temperature effect may be attributed to the various chemical, physical and microstructural changes already mentioned in this paper (see also Ref. [32]) and to the low hydration level reached with W/C=0.25 at a curing temperature of 10 8C, even after 24 h (see Ref. [3], for comparison with higher curing temperatures and W/C).…”

Section: Calculation Of Apparent Activation Energy From Chemical Shrisupporting

confidence: 52%

Autogenous deformations of cement pastes

Baroghel-Bouny

Mounanga

Khelidj

et al. 2006

Cement and Concrete Research

161

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A micro-macro experimental study has been performed, from the end of mixing up to 2 years, on a set of plain cement pastes prepared with the same type I ordinary Portland cement (OPC) and various water-to-cement ratios (W/C), and cured at various constant temperatures. In this part I of the paper, volumetric autogenous shrinkage has been analysed in relation to various parameters characterizing the hydration process: chemical shrinkage, degree of hydration of the cement, Ca(OH) 2 content and Vicat setting times, within the early-age period (V24 h). The effects of the curing temperature (ranging from 10 up to 50 8C) have in particular been investigated. Its effects recorded on both the rate and the magnitude of volumetric autogenous shrinkage vs. time have pointed out the irrelevance of the usual maturity concept to describe such phenomenon within the whole early-age period. An improved maturity concept has hence been proposed. It is based on separating the early-age period in different phases and on using chemical shrinkage data for the calculation of the apparent activation energy applied to the prediction of autogenous deformations occurring after the setting period. Furthermore, micro-macro relationships have been pointed out, illustrating in particular the determining role of Ca(OH) 2 .

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Section: Calculation Of Apparent Activation Energy From Chemical Shrisupporting

confidence: 52%

Autogenous deformations of cement pastes

Baroghel-Bouny

Mounanga

Khelidj

et al. 2006

Cement and Concrete Research

161

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“…Several approaches have been developed to predict temperature evolution in cement based materials (Jensen and Hansen 1999;Samson and Marchand 2007). The most common methods are based on a single mass conservation equation with average parameters.…”

Section: Modeling Heat Transfermentioning

confidence: 99%

An Efficient Chloride Ingress Model for Long-Term Lifetime Assessment of Reinforced Concrete Structures Under Realistic Climate and Exposure Conditions

Nguyen

Bastidas‐Arteaga

Amiri

et al. 2017

Int J Concr Struct Mater

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Chloride penetration is among the main causes of corrosion initiation in reinforced concrete (RC) structures producing premature degradations. Weather and exposure conditions directly affect chloride ingress mechanisms and therefore the operational service life and safety of RC structures. Consequently, comprehensive chloride ingress models are useful tools to estimate corrosion initiation risks and minimize maintenance costs for RC structures placed under chloride-contaminated environments. This paper first presents a coupled thermo-hydro-chemical model for predicting chloride penetration into concrete that accounts for realistic weather conditions. This complete numerical model takes into account multiple factors affecting chloride ingress such as diffusion, convection, chloride binding, ionic interaction, and concrete aging. Since the complete model could be computationally expensive for long-term assessment, this study also proposes model simplifications in order to reduce the computational cost. Long-term chloride assessments of complete and reduced models are compared for three locations in France (Brest, Strasbourg and Nice) characterized by different weather and exposure conditions (tidal zone, de-icing salts and salt spray). The comparative study indicates that the reduced model is computationally efficient and accurate for long-term chloride ingress modeling in comparison to the complete one. Given that long-term assessment requires larger climate databases, this research also studies how climate models may affect chloride ingress assessment. The results indicate that the selection of climate models as well as the considered training periods introduce significant errors for mid-and long-term chloride ingress assessment.

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“…The dilatometric technique has been tested during years of research work on binder phases of HPC (Jensen and Hansen 2002;Jensen and Hansen 1995;Jensen and Hansen 1993;Jensen and Hansen 1999). A particular characteristic of this measuring technique is the encapsulation of the hardening cement-based material in a specially designed, corrugated polyethylene mould; this effectively prevents moisture loss and ensures insignificant restraint during the hardening of the specimen.…”

Section: Experimental Programmentioning

confidence: 99%

Effects of Fine LWA and SAP as Internal Water Curing Agents

Sensale

Gonçalves

2014

Int J Concr Struct Mater

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Typical high-performance concrete (HPC) mixtures are characterized by low water-cementitious material ratios, high cement contents, and the incorporation of admixtures. In spite of its superior properties in the hardened state, HPC suffers from many practical difficulties such as its sensitivity to early-age cracking (which is associated with self-desiccation and autogenous shrinkage). In this context, conventional curing procedures are not sufficiently effective to address these limitations. In order to overcome this issue, two strategies, which are based on the use of internal reservoirs of water, have been recently developed. One of these strategies is based on the use of lightweight aggregates (LWA), while the other is based on the use of superabsorbent polymers (SAP). This paper studies and compares the efficiency of the LWA and SAP approaches. Moreover, some of the theoretical aspects that should be taken into account to optimize their application for internal curing of HPC are also discussed. Two fine LWA's and one SAP are studied in terms of autogenous deformation and compressive strength. Increasing the amounts of LWA or SAP can lead to a reduction of the autogenous deformation and compressive strength (especially when adding large amounts). By selecting appropriate materials and controlling their amount, size, and porosity, highly efficient internal water curing can be ensured.

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Influence of temperature on autogenous deformation and relative humidity change in hardening cement paste

Cited by 155 publications

References 4 publications

Autogenous deformations of cement pastes

Autogenous deformations of cement pastes

An Efficient Chloride Ingress Model for Long-Term Lifetime Assessment of Reinforced Concrete Structures Under Realistic Climate and Exposure Conditions

Effects of Fine LWA and SAP as Internal Water Curing Agents

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