Influence of constituents and composition on autogenous shrinkage of cementitious materials

Tazawa, Ei-ichi; Miyazawa, S.

doi:10.1680/macr.1997.49.178.15

Cited by 71 publications

(25 citation statements)

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“…From Figure 4, it can be seen that the Portland cement CEM I cracks after 30 hours of hardening. This is in good agreement with literature results [3][4][5]. Although the specimens made of Blast furnace slag cements build up a substantial level of tensile stresses, they turned out not to crack with the deformations fully restrained.…”

Section: Results: Paste Measurementssupporting

confidence: 92%

A mini-TSTM for measuring paste deformations at early ages

Koenders¹,

Schlangen²,

Leegwater³

2006

International RILEM Conference on Volume Changes of Hardening Concrete: Testing and Mitigation

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The start of the chemical reaction between cement and water is the moment that concrete starts to develop its properties. More precisely, it is the paste that starts to generate a loadbearing microstructure that exhibits a certain number of mechanical properties. One of the properties generated during hardening is the so-called hardening shrinkage. Quite often, this property is measured from hardening concrete by linear measurements and related to the paste deformation by using mathematical models. The opposite way, by measuring the paste deformation and relate it to the deformation of concrete is another possibility that can be applied. In the paper, a new apparatus called "mini-TSTM" (Thermal Stress Testing Machine) for measuring the hardening shrinkage of paste will be presented and discussed [1]. The device has been developed to measure the hardening deformations directly from the paste. It provides more insight in the contracting forces that act on the paste located in between the aggregates. The mini-TSTM is scaled down from the "full-scale" TSTM machine which is commonly used for measuring the thermal stresses of hardening concrete elements. With the mini-TSTM, the contraction forces can be measured (load controlled) as well as the deformations (deformation controlled) which are mobilized by a paste during hardening. The mini-TSTM is a tool that fits into the moisture controlled specimen chamber of the ESEM 1 with enables the opportunity to sample the paste deformations during hardening as well.The paper provides the test results and numerical simulations of the shrinkage deformations and stresses for four different cements, measured from a hardening paste with the mini-TSTM. Three similar Blast furnace slag cements are tested which were produced by different mills, and one Portland cement is used as reference cement. Results are compared with measurements from the full-scale TSTM. The results show significant differences between shrinkage measurements from both instruments. The results provide a clear picture of the main effects that play a role when relating shrinkage deformations from paste to concrete or visa versa.

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Section: Results: Paste Measurementssupporting

confidence: 92%

A mini-TSTM for measuring paste deformations at early ages

Koenders¹,

Schlangen²,

Leegwater³

2006

International RILEM Conference on Volume Changes of Hardening Concrete: Testing and Mitigation

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“…Autogenous shrinkage values of the 16 tested SCC and two HPC mixtures are compared to values predicted from the Tawaza and Miyazawa model 1997 [9], Jonasson and Hedlund model 2000 [10], and CEB-FIP model 1999 [11]. In order to improve the prediction accuracy, the cement type factor of Tazawa and Miyazawa prediction model was modified by applying the test data to the prediction model.…”

Section: Modification Of Existing Autogenous Shrinkage Prediction Modelmentioning

confidence: 99%

Autogenous Shrinkage of Prestressed Self-Consolidating Concrete

Long¹

2011

TOCIEJ

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Shrinkage can be critical factor for the design of structural members due to the length changes by the timedependent deformation. Given the high fluidity and different mixture proportions of SCC, the shrinkage of such concrete can differ from those of conventional concrete or HPC of normal consistency. Proper estimate of autogenous shrinkage of self-consolidating concrete (SCC) can provide engineers with the information necessary for producing high quality products manufactured with SCC. An experimental program was undertaken to evaluate autogenous shrinkage of precast, prestressed SCC. Sixteen SCC with slump flow of 680 ± 20 mm were evaluated. These mixtures were made with 440 to 500 kg/m 3 of binder, Type MS cement or HE cement and 20% Class F fly ash, 0.34 to 0.40 w/cm, viscosity-modifying admixture content of 0 to 100 mL/100 kg of binder, and 0.46 to 0.54 sand-to-total aggregate volume ratio. Two highperformance concretes (HPC) with 0.34 and 0.38 w/cm and slump of 150 mm were also investigated. Based on the test results, the HPC developed similar autogenous shrinkage at 56 days compared to SCC made of a given binder type. Shrinkage was compared to prediction models proposed by Tawaza and Miyazawa 1997, Jonasson and Hedlund 2000, and CEB-FIP 1999. The Tazawa and Miyazawa model was modified to provide adequate prediction of autogenous shrinkage for precast, prestressed SCC.

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“…On the other hand, those of Belite-rich low-heat Portland cement (LPC) were 26%, 55%, 3%, and 9%, respectively. A previous study revealed that the mineral composition of cement affects autogenous shrinkage significantly (Tazawa et al 1993, Tazawa et al 1997. Based on Eq.…”

Section: Methodsmentioning

confidence: 99%

Serviceability Performance Evaluation of RC Flexural Members Improved by Using Low-Shrinkage High-Strength Concrete

Tanimura¹,

Satō

Hiramatsu³

2007

ACT

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This paper aims to show the importance of autogenous shrinkage for the serviceability performance of reinforced high-strength concrete (HSC) flexural beams, and also the effectiveness of low-shrinkage HSCs (LS-HSC) made by using expansive additive and/or shrinkage-reducing chemical agent and/or Belite-rich low-heat Portland cement for improving the flexural serviceability performance of beam. From the design equation point of view, this paper also proposes a new concept for evaluating flexural crack width and deformation of RC beams taking into consideration the early age deformation of concrete before loading. The experimental results show that autogenous shrinkage of HSC significantly affects increases in crack width and deformation of RC beams, while LS-HSCs markedly improves their serviceability performance. The present concept, which takes into account strain change in tension reinforcement and curvature change in the cracked section before and after loading, is effective in explaining the effects of shrinkage and expansion of concrete before loading on maximum crack width and flexural deformation of RC beams. JSCE (Japan Society of Civil Engineers) code equations for predicting maximum crack width and flexural deformation into which the present concept is incorporated improve the prediction accuracy compared with conventional equations and show fairly good agreement with experimental results.

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Influence of constituents and composition on autogenous shrinkage of cementitious materials

Cited by 71 publications

References 0 publications

A mini-TSTM for measuring paste deformations at early ages

A mini-TSTM for measuring paste deformations at early ages

Autogenous Shrinkage of Prestressed Self-Consolidating Concrete

Serviceability Performance Evaluation of RC Flexural Members Improved by Using Low-Shrinkage High-Strength Concrete

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