Creep and shrinkage of concrete: physical origins and practical measurements

Acker, Paul; Ulm, Franz‐Josef

doi:10.1016/s0029-5493(00)00304-6

Cited by 176 publications

(75 citation statements)

References 12 publications

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“…The modulus results are sensitive to the mode of outer C-S-H deposition, with the diffuse filling model yielding results which are closer to the experiment at later ages. Model 2 uses a Young's modulus for the solid part of both inner and outer C-S-H gels determined by inverse analysis in [12] from nanoindentation tests on inner C-S-H gel reported in [40]. This is required, as the micromechanical model [12] considers inner C-S-H gel to be of a constant porosity, while outer C-S-H gel porosity decreases as hydration proceeds.…”

Section: Resultsmentioning

confidence: 99%

“…Models 4 and 6 used nanoindentation data for the so-called low and high-density (LD and HD) C-S-H published in [41,42]. Model 5 used a simple homogenization scheme for calculating the stiffness of the "saturated C-S-H" [22] and estimated values close to the nanoindentation data [40] used also in the other models. In model 7, the compressive strength and the dynamic moduli of cement pastes were directly related to the degree of interparticle bonding (connectivity) of the solid phase in the microstructure of cementitious materials [31].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Numerical benchmark campaign of COST Action TU1404 – microstructural modelling

Wyrzykowski

Sanahuja²,

Charpin³

et al. 2017

RILEM Tech Lett

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This paper presents the results of the numerical benchmark campaign on modelling of hydration and microstructure development of cementitious materials. This numerical benchmark was performed in the scope of COST Action TU1404 "Towards the next generation of standards for service life of cement-based materials and structures". Seven modelling groups took part in the campaign applying different models for prediction of mechanical properties (elastic moduli or compressive strength) in cement pastes and mortars. The simulations were based on published experimental data. The experimental data (both input and results used for validation) were open to the participants. The purpose of the benchmark campaign was to identify the needs of different models in terms of input experimental data, verify predictive potential of the models and finally to provide reference cases for new models in the future. The results of the benchmark show that a relatively high scatter in the predictions can arise between different models, in particular at early ages (e.g. elastic Young's modulus predicted at 1 d in the range 6-20 GPa), while it reduces at later age, providing relatively good agreement with experimental data. Even though the input data was based on a single experimental dataset, the large differences between the results of the different models were found to be caused by distinct assumed properties for the individual phases at the microstructural level, mainly because of the scatter in the nanoindentation-derived properties of the C-S-H phase.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Numerical benchmark campaign of COST Action TU1404 – microstructural modelling

Wyrzykowski

Sanahuja²,

Charpin³

et al. 2017

RILEM Tech Lett

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show abstract

“…The creep phenomenon is more complex than the shrinkage one. The creep mechanism can be explained by the viscous slippage between C-S-H sheets [20]. The differential deformability of the paste and the aggregate (which do not creep) under loading reveals the importance of the quality of the interfacial transitional zone (ITZ).…”

Section: Effect Of Aggregate Quality On the Creepmentioning

confidence: 99%

Time-dependent behaviour of high performance concrete: influence of coarse aggregate characteristics

Makani

Vidal

Pons

et al. 2010

EPJ Web of Conferences

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Abstract. This paper examines the influence of coarse aggregate characteristics on the time-dependent deformations of High Performances Concretes (HPC). Four concretes made using the same cement paste but incorporating different types of aggregate (rolled siliceous gravel, crushed granite, crushed limestone and crushed siliceous gravels) were studied in order to investigate the effect of aggregate properties on the compressive strength, modulus of elasticity, shrinkage and creep. The results indicate that the aggregate type has a significant effect on creep and shrinkage deformations of HPC. An influence of the shape of aggregate on time-dependent deformations has also been observed. On the basis of these results, long-term behaviour seems to be correlated to the characteristics of the Interfacial Transition Zone (ITZ) strongly depending on the mineralogical nature and properties of aggregates. The experimental results are compared with the values calculated using the current Eurocode 2 model in order to assess the accuracy of the predictions.

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“…Since then much has been found about the physical nature and mechanisms of the phenomena [21][22][23][24] and several mathematical laws to determine the relationship between strain and stress over time are available [19,[25][26][27][28][29]. However, the composition of dam concrete, with large fly ash content and large aggregates, requires more research regarding the hydration and aging processes and the calibration of the existing model with specific experimental results [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Dam and wet-screened concrete creep in compression: in situ experimental results and creep strains prediction using model B3 and composite models

2016

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This paper proposes a methodology for the prediction of the compressive creep strains of dam concrete based on wet-screened experimental results at constant elevated temperature conditions measured in situ. Due to its large aggregate dimensions, the experimental characterization of dam concrete has particular constraints. The wet-screened concrete, obtained by sieving the aggregates larger than a given dimension, after mixing, is used to cast standard specimens and to embed monitoring devices. An experimental in situ installation using creep cells was used to obtain the compressive creep strain development over time for the maturing conditions of the dam core. The study of the effect of wet-screening procedure on creep in compression considers three types of concrete, dam concrete and two wet-screened concretes tested at three loading ages, 28, 90 and 365 days. The comparison between different types of concrete at different maturing conditions requires the definition of a reference state given by the maturity method, using the equivalent age, and relies on the fit of compressive creep strains to the RILEM recommended model B3. To take into account the effect of the aggregate content on the deformability properties of dam concrete, an equivalent two-phase composite model was applied. The equivalent composite model considered the equivalent matrix as the wet-screened concrete and the inclusions as the larger aggregates that are removed during the wet-screening procedure. Predictions obtained with the composite model are close to the dam concrete experimental results, for the tested loading ages.

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Creep and shrinkage of concrete: physical origins and practical measurements

Cited by 176 publications

References 12 publications

Numerical benchmark campaign of COST Action TU1404 – microstructural modelling

Numerical benchmark campaign of COST Action TU1404 – microstructural modelling

Time-dependent behaviour of high performance concrete: influence of coarse aggregate characteristics

Dam and wet-screened concrete creep in compression: in situ experimental results and creep strains prediction using model B3 and composite models

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