Modelling cement microstructure: Pixels, particles, and property prediction

Bentz, Dale P.

doi:10.1007/bf02481514

Cited by 53 publications

(11 citation statements)

References 36 publications

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“…6,18 The measured PSDs (Fig. 2) and Bogue composition of the cements were used to create starting microstructures with w/c ϭ 0.35.…”

Section: Microstructural Modelingmentioning

confidence: 99%

“…One way around this minor discrepancy is to use the NIST cement hydration model, executed under both sealed and saturated curing conditions. 6,18 Figure 5 shows a comparison of the model-predicted (saturated conditions) and the experimentally observed chemical-shrinkage results for the four different cement finenesses. As expected, the two finer cements hydrated at a significantly more rapid rate than did the coarser cements.…”

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confidence: 99%

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Influence of Cement Particle‐Size Distribution on Early Age Autogenous Strains and Stresses in Cement‐Based Materials

Bentz

Jensen

Hansen

et al. 2001

Journal of the American Ceramic Society

116

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The influence of cement particle-size distribution on autogenous strains and stresses in cement pastes of identical waterto-cement ratios is examined for cement powders of four different finenesses. Experimental measurements include chemical shrinkage, to quantify degree of hydration; internal relative humidity development; autogenous deformation; and eigenstress development, using a novel embedded spherical stress sensor. Because the latter three measurements are conducted under sealed conditions, whereas chemicalshrinkage measurements are made under "saturated" conditions, the National Institute of Standards and Technology cement hydration and microstructure development model is used to separate the effects of differences in hydration rates (kinetics) from those caused by the different initial spatial arrangement of the cement particles. The initial arrangement of the cement particles controls the initial pore-size distribution of the cement paste, which, in turn, regulates the magnitude of the induced autogenous shrinkage stresses produced by the water/air menisci in the air-filled pores formed throughout the hydration process. The experimental results indicate that a small autogenous expansion (probably the result of ettringite formation), as opposed to a shrinkage, may be produced and early age cracking possibly avoided through the use of coarser cements.

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“…6,18 The measured PSDs (Fig. 2) and Bogue composition of the cements were used to create starting microstructures with w/c ϭ 0.35.…”

Section: Microstructural Modelingmentioning

confidence: 99%

mentioning

confidence: 99%

Influence of Cement Particle‐Size Distribution on Early Age Autogenous Strains and Stresses in Cement‐Based Materials

Bentz

Jensen

Hansen

et al. 2001

Journal of the American Ceramic Society

116

View full text Add to dashboard Cite

show abstract

“…It is proposed by the NIST (National Institute of Standards and Technology, USA) and was developed by Bentz. [48][49][50][51] It has been used for more than 10 years by many researchers of the scientific community and the hydration module seems to give pertinent results according to the numerous papers published in recent years. [52][53][54][55][56] Its principle of operation can be found elsewhere.…”

Section: Mechanism Responsible For the Mitigation Of Asr-expansionmentioning

confidence: 99%

“…[52][53][54][55][56] Its principle of operation can be found elsewhere. [48][49][50][51] One item of information given by the model is the volume of C-S-H having Ca/Si ratios of 1 . 8 and 1 .…”

Section: Mechanism Responsible For the Mitigation Of Asr-expansionmentioning

confidence: 99%

Mechanism of ASR reduction by reactive aggregate powders

Cyr

Carles-Gibergues

Moisson

et al. 2009

Advances in Cement Research

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This study aimed to evaluate the effectiveness of a mechanism responsible for the mitigation of expansion when reactive aggregate powders (RAP) were used in concrete containing the same reactive aggregate. In the first part, it was shown that RAP were efficient in reducing the expansion of concrete by 35 to 95%. The most efficient powders were those coming from aggregates having high active silica contents (glass, opal). Powders of siliceous limestone were less effective. In a second part, experimental evidence of the pozzolanic activity of RAP was obtained. It was shown that RAP were similar to pozzolan, since they consumed lime and produce calciumsilicate-hydrate (C-S-H) having a lower calcium/silica (C/S) ratio than normal C-S-H. The third part showed experimentally that these low C/S C-S-H could increase the redistribution of alkalis of the pore solution, thus reducing the alkalinity of the pore solution to a level that was sufficiently low to limit the attack of coarser reactive aggregates. In the final part, numerical simulations using a modified version of the hydration model CEMHYD3D were carried out to support this assumption.

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“…Among them, computer-based cement hydration models, e.g. CEMHYD3D [3], HYMOSTRUC3D [4,5] and the more recently proposed lic (pronounced Mike) [6] are commonly applied to simulate the hydration process and gradual formation of the microstructure of cement paste. As a non-destructive technique, X-ray micro-computed tomography (micro-CT) has many advantages compared to other experimental techniques and has been successfully utilised to obtain the 3D microstructure of cement paste at a high resolution of 0.5 lm/voxel [7].…”

Section: Introductionmentioning

confidence: 99%

Microstructure-informed modelling of damage evolution in cement paste

Zhang

Jivkov

2014

Construction and Building Materials

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h i g h l i g h t sMacroscopic behaviour from microstructure features and meso-scale principles. Derivation of microstructure features from high-resolution micro-CT images. Construction of site-bond model with microstructure information. Demonstration of agreement between calculated responses and experimental data. Quantitative assessment of microstructure effects on macroscopic behaviour. a b s t r a c tCement paste is a binder for cementitious materials and plays a critical role in their engineering-scale properties. Understanding fracture processes in such materials requires knowledge of damage evolution in cement paste. A site-bond model with elastic-brittle spring bundles is developed here for analysis of the mechanical behaviour of cement paste. It incorporates key microstructure information obtained from high resolution micro-CT. Volume fraction and size distribution of anhydrous cement grains are used for calculating model length scale and elasticity. Porosity and pore size distribution are used to allocate local failure energies. Macroscopic damage emerges from the generation of micro-crack population represented by bond removals. Effects of spatial distribution, porosity and sizes of pores on tensile strength and damage are investigated quantitatively. Results show a good agreement with experiment data, demonstrating that the proposed technology can predict mechanical and fracture behaviour of cementitious materials based exclusively on microstructure information.

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Modelling cement microstructure: Pixels, particles, and property prediction

Cited by 53 publications

References 36 publications

Influence of Cement Particle‐Size Distribution on Early Age Autogenous Strains and Stresses in Cement‐Based Materials

Influence of Cement Particle‐Size Distribution on Early Age Autogenous Strains and Stresses in Cement‐Based Materials

Mechanism of ASR reduction by reactive aggregate powders

Microstructure-informed modelling of damage evolution in cement paste

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