A Study of Creep Behaviour of Concrete Using Expansive Admixture

Momose, Haruki; Kanda, Tetsushi; Mizobuchi, Toshiaki; Mihashi, Hirozo

doi:10.3130/aijs.71.1_10

Cited by 2 publications

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“…Because JCI formula takes ultimate creep coefficient φ∞ and creep rate factor βH as a function of compressive strength or elastic modulus, early-age creep behavior of high strength concrete can be reproduced in a satisfactory precision. Based on the JCI formula, the authors proposed a modified JCI formula capable of predicting βH using compressive strength for concretes of normal strength ranges (Momose et al 2006 Using creep test data, β H and φ 0 were numerically determined using CEB-FIP formulas from (17) to (25) and associated least square regression. Results of β H as well as prediction of the modified JCI formula are also shown in Fig.…”

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Quantitative Evaluation of Crack Resistance Mechanism of Blast Furnace Slag Blended Cement Concrete via Restrained Shrinkage Stress Analysis

Kanda

Momose

Imamoto

et al. 2015

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Application of blast-furnace slag blended cement is an important option to reduce carbon dioxide emission peculiar to concrete materials in construction, and concrete structures using the blended cement concrete (hereafter denoted as BFS concrete) is in great demand. However, shrinkage cracking resistance of BFS concrete decreases at high temperatures. In this study, mechanisms of the reduction of cracking resistance at high temperatures were investigated aiming at the control of shrinkage cracking of BFS concrete as the final goal. Constitutive material properties necessary for restrained shrinkage stress analysis were derived through experiments including such as restrained cracking test under a temperature of 30, 20 and 10°C, free shrinkage test, and compressive creep test. On the basis of the constitutive material properties obtained with the above tests, applicability of existing restrained shrinkage stress analysis to BSF concrete was examined. Analytical results indicate that the stress analysis was found to reproduce the cracking behavior at an ambient temperature from 10 to 20°C. However, at an ambient temperature of 30°C, the analysis overestimates restrained shrinkage stress, which is considered due to underestimating creep effects. This underestimation may occur due to surface micro-cracks eminently generated on surface.

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confidence: 99%

Quantitative Evaluation of Crack Resistance Mechanism of Blast Furnace Slag Blended Cement Concrete via Restrained Shrinkage Stress Analysis

Kanda

Momose

Imamoto

et al. 2015

ACT

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Impacts of Trace Additives and Early-Stage Curing Conditions on the Shrinkage Cracking Resistance of Blast-Furnace Slag Cement Concrete

Kanda

Momose

Ishizeki

et al. 2016

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Medium volume blast furnace slag concrete has been highly expected to reduce carbon dioxide emission in concrete production, while it was found that this concrete was prone to shrinkage cracking specifically under hot summer climates. To improve this negative performance, this study focused on the utilization of trace additives and water curing. The trace additives were gypsum and calcium carbonate, with which binder is called low shrinkage BFS. Furthermore, to reduce prominent autogenous shrinkage, initial water curing was investigated. As a result, combination of low shrinkage BFS and water curing was found to significantly strengthen shrinkage cracking resistance, which was expressed by cracking age resulted in restrained shrinkage cracking tests. Furthermore, curing experiment showed that water curing may be substituted by water covered curing on element surface in construction site as a simple and economical measure to supply water to concrete at initial stage of hardening.

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A Study of Creep Behaviour of Concrete Using Expansive Admixture

Cited by 2 publications

References 1 publication

Quantitative Evaluation of Crack Resistance Mechanism of Blast Furnace Slag Blended Cement Concrete via Restrained Shrinkage Stress Analysis

Quantitative Evaluation of Crack Resistance Mechanism of Blast Furnace Slag Blended Cement Concrete via Restrained Shrinkage Stress Analysis

Impacts of Trace Additives and Early-Stage Curing Conditions on the Shrinkage Cracking Resistance of Blast-Furnace Slag Cement Concrete

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