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Arnaud Pertue

Bio: Arnaud Pertue is an academic researcher from University of Nantes. The author has contributed to research in topics: Shrinkage & Cement. The author has an hindex of 2, co-authored 9 publications receiving 46 citations. Previous affiliations of Arnaud Pertue include Centre national de la recherche scientifique.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the results of a multi-parameter experimental study conducted on three different types of binder are analyzed, and the results reveal that the first through crack of cement pastes systematically appears for maximal internal stress values lower than the material tensile strength, estimated with three-point flexural tests.
Abstract: High-performance cement-based materials, characterized by low water-to-cement (W/C) ratio and high cement content, are sensitive to early-age cracking because their autogenous shrinkage rate and magnitude are particularly high during this period. This article firstly presents experimental tools especially designed for the measurement of free and restrained autogenous shrinkage at early-age. Then, the results of a multi-parameter experimental study conducted on three different types of binder are analyzed. The physico-chemical deformations of cement pastes and mortars were measured from the very early-age up to several days in saturated and autogenous conditions to investigate the effects of binder, water-to-binder ratio, presence of aggregates and temperature on the driving-mechanisms leading to early-age autogenous cracking. Complementary tests such as hydration rate measurement and microscopic observations were also performed. Among the three binders used, the blast furnace slag cement shows higher chemical strain, for a given quantity of chemically-bound water, and higher early-age autogenous shrinkage. The presence of aggregates generates a local restraining effect of cement paste deformations, leading to the formation of microcracks in the surrounding cement paste. Ring test results reveal that the first through crack of cement pastes systematically appears for maximal internal stress values lower than the material tensile strength, estimated with three-point flexural tests. This phenomenon may be due to diffuse damage of the cementitious matrix, whose deformations are partially restrained.

35 citations

Proceedings ArticleDOI
11 Sep 2006
TL;DR: In this paper, a rotary test device for the measurement of volumetric autogenous shrinkage makes it possible to eliminate bleeding and segregation problems related to medium or high water tocement ratio (W/C).
Abstract: This paper presents improved test methods for the measurement of autogenous shrinkage of cement-based materials at very early age (0 to 48h). These five test methods enable the measurement of chemical shrinkage, volumetric autogenous shrinkage, linear autogenous shrinkage in horizontal and vertical directions and restrained autogenous deformations leading to early-age cracking of the material. The first experimental results are discussed and analyzed. It was shown that the presence of granular inclusions slightly accelerates the evolution of mortar chemical shrinkage. The rotary test device for the measurement of volumetric autogenous shrinkage makes it possible to eliminate bleeding and segregation problems related to medium or high water-to-cement ratio (W/C). The use of non-contact and waterproof eddy current sensors permits to quantify uniaxial autogenous deformations of the cementitious matrices since the casting of the material, in quasi-isothermal conditions. Finally, it is shown from ring test results that the age of cracking decreases when the temperature increases, but the cracking appears at nearly the same hydration degree.

9 citations

01 Jan 2007
TL;DR: In this paper, the authors analyzed the autogenous shrinkage of concrete in free and restrained conditions, and showed that the internal stresses generated can lead to premature cracking of the material.
Abstract: Numerous studies have been carried out to characterize the autogenous shrinkage of cement-based materials in free conditions at early and very early age. But the results obtained are not sufficient to understand the autogenous volume variations of concrete in realistic structural conditions. Indeed, the analysis of such deformations requires investigating the cementitious system’s behaviour in restrained conditions, when the internal stresses generated can lead to the premature cracking of the material.

1 citations

Book ChapterDOI
01 Jan 2007
TL;DR: In this paper, the authors analyzed the autogenous shrinkage of concrete in free and restrained conditions, and showed that the internal stresses generated can lead to premature cracking of the material.
Abstract: Numerous studies have been carried out to characterize the autogenous shrinkage of cement-based materials in free conditions at early and very early age. But the results obtained are not sufficient to understand the autogenous volume variations of concrete in realistic structural conditions. Indeed, the analysis of such deformations requires investigating the cementitious system’s behaviour in restrained conditions, when the internal stresses generated can lead to the premature cracking of the material.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the shrinkage characteristics of fly ash/slag and the factors affecting it were investigated and a series of tests were conducted to determine the chemical shrinkage, autogenous shrinkage and drying shrinkage.
Abstract: The purpose of this study is to investigate the shrinkage characteristics of alkali-activated fly ash/slag (henceforth simply AFS) and the factors affecting it. A series of tests were conducted to determine the chemical shrinkage, autogenous shrinkage and drying shrinkage. The microstructures and reaction products were also characterized through XRD and SEM/EDS analyses. An increase in the slag content from 10% to 30% resulted in a denser matrix and showed a higher Ca/Si ratio of C–N–A–S–H in the microstructure. Higher sodium silicate and slag contents in a mixture caused more chemical, autogenous, and drying shrinkage, but led to a higher compressive strength. From the test results, it can be concluded that the autogenous shrinkage of AFS mortar occurs mainly due to self-desiccation in hardened state rather than volume contraction by chemical shrinkage in fresh state. The AFS paste showed higher drying shrinkage than ordinary Portland cement (OPC), which may be caused by the higher mesopore volume of the AFS paste compared to that of OPC paste.

289 citations

Journal ArticleDOI
TL;DR: In this paper, a study on the influence of granular inclusions on the chemical shrinkage of cementitious matrices at very early age (⩽24 h) was carried out on cement pastes and mortars.
Abstract: 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 (⩽24 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.

149 citations

Journal ArticleDOI
TL;DR: In this article, the performance of LECA (Lightweight Expanded Clay Aggregate) and natural zeolite aggregates from Iran to act as internal curing agents was studied while LECA is well recognized as an excellent internal curing agent in the literature.

128 citations

Journal ArticleDOI
TL;DR: In this article, the authors evaluated the basic material properties of UHPFRC at an early age, penetration resistance, shrinkage, tensile and ultrasonic pulse velocity (UPV) tests were performed.

109 citations

Journal ArticleDOI
TL;DR: In this article, the authors focused on studying the time-dependent properties of recycled concrete, especially shrinkage and creep behaviour, and showed that the use of pre-saturated recycled aggregates leads to different time-dependency in shrinkage.

89 citations