Chemical shrinkage and autogenous shrinkage of hydrating cement paste

Tazawa, Ei-ichi; Miyazawa, S.; Kasai, Tetsurou

doi:10.1016/0008-8846(95)00011-9

Cited by 185 publications

(59 citation statements)

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“…Developed by the inventor of Le Chatelier's contraction, it was sophisticated by Powers [43] and by Buil [44]: Buil proposed for example an automatic follow-up of the water level in the capillary tube. Many researchers [19][20][21][22][23][24][25][26][27][28][29]31,32,[37][38][39] have used the dilatometry to study the influence of the cement composition, the W/C ratio, the presence of pozzolanic additions and polymer additives on the evolution of chemical shrinkage. This method is the object of a measurement protocol defined by the Japanese Concrete Institute (JCI) in 1999 [45].…”

Section: Measurement Methodsmentioning

confidence: 99%

Chemical shrinkage of cement pastes and mortars at very early age: Effect of limestone filler and granular inclusions

Bouasker

Mounanga

Turcry

et al. 2008

Cement and Concrete Composites

135

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This article presents a study on the influence of limestone filler and granular inclusions on the chemical shrinkage of cementitious matrices at very early age (624 h). Measurements of chemical shrinkage and hydration degree are carried out on cement pastes and mortars. During this study, two cement types (CEM 1 and CEM 2), two water-to-cement ratios (W/C = 0.30 and 0.40) and three substitution rates of cement by limestone filler (LF/C = 0; 0.25 and 0.67) are used. The effects of aggregate shape (glass beads and natural sand), aggregate-to-cement mass ratio (A/C = 0.5 and 1) and particle size distribution (D = 1 and 2 mm) on the chemical shrinkage and the hydration rate are quantified. The results obtained show that limestone filler causes an acceleration of both Le Chatelier's contraction and hydration process since the very first hours of hydration. In addition, the chemical shrinkage amplitude is not significantly influenced by the presence of aggregates. Finally, the presence of limestone filler and granular inclusions does not cause significant modification of the quasi-linear relation observed at early age between the chemical shrinkage and the hydration degree of the cementitious matrices.

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Section: Measurement Methodsmentioning

confidence: 99%

Chemical shrinkage of cement pastes and mortars at very early age: Effect of limestone filler and granular inclusions

Bouasker

Mounanga

Turcry

et al. 2008

Cement and Concrete Composites

135

View full text Add to dashboard Cite

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“…As noted by several researchers (e.g., LE ROY; DE LARRARD, 1993;MIYAZAWA, 1993;TAZAWA et al, 1995), silica fume concretes with low water-cement ratios exhibit considerable endogenous shrinkage. This behaviour at very early age is demonstrated in Figure 5.…”

Section: Evolution Of Temperature and Shrinkage During The Hardening mentioning

confidence: 87%

Retração e Fluência de Concretos de Alta Resistência: Análise Experimental

et al. 2002

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The creep and shrinkage behaviour of high strength silica fume concretes is significantly different from that of conventional concretes. In order to represent the proper time-dependent response of the material in structural analysis and design, these aspects should be adequately quantified. This paper discusses an experimental setup that is able to determine the creep and shrinkage of concrete from the time of placing. It also compares different gages that can be used for measuring the strains. The method is applied to five different concretes in the laboratory under controlled environmental conditions. The phenomena that are quantified can be classified as basic shrinkage, drying shrinkage, basic creep and drying creep. The relative importance of these mechanisms in high strength concrete will also be presented.

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“…The dilatometric approach consists in measuring the drop of a water meniscus in a graduated capillary tube mounted on the top of an Erlenmeyer flask containing diluted cement paste [2,10]. The total autogenous shrinkage (ml/g of cement) is obtained by dividing the volume variation by the mass of cement in the solution.…”

Section: Total Autogenous Shrinkagementioning

confidence: 99%

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

et al. 1999

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A B S T R A C T R I~ S U M I~After defining and describing the main physicochemical mechanisms governing the autogenous shrinkage of concrete, a number of different experimental approaches used to asses this phenomenon are discussed. The base principle and a detail description of a new experimental technique aiming to completely characterise the autogenous shrinkage of a cement paste are presented. The originality of the technique comes from the fact that the variation of the external volume (external autogenous shrinkage) and the volume of the gasfilled spaces in the liquid phase after the hardening (internal autogenous shrinkage) are measured separately and simultaneously. The total autogenous shrinkage is the sum of the internal and external autogenous shrinkages. A number of experimental results are presented to demonstrate the validity of the proposed experimental approach and to analyse the effect of water/cement ratio on the development of internal and external shrinkages. Apr~s avoir ddfini et ddcrit les principaux m~canismes physico-chimiques 2~ l'origine du retrait endog~ne du bdton

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Chemical shrinkage and autogenous shrinkage of hydrating cement paste

Cited by 185 publications

References 1 publication

Chemical shrinkage of cement pastes and mortars at very early age: Effect of limestone filler and granular inclusions

Chemical shrinkage of cement pastes and mortars at very early age: Effect of limestone filler and granular inclusions

Retração e Fluência de Concretos de Alta Resistência: Análise Experimental

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

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