The effect of temperature on strength – porosity relationship for concrete

Vodák, F.; Trtík, K.; Kapičková, O.; Hošková, Šárka; Demo, P.

doi:10.1016/j.conbuildmat.2004.04.009

Cited by 70 publications

(16 citation statements)

References 15 publications

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“…The furnace capacity was almost 0.2 m 3 and was ventilated. The duration of exposure at elevated temperatures practically guarantees that the specimens are heated uniformly and the whole sample volume is reached with adequate accuracy (Vodák, 2004). The specimens were heated in groups of 12.…”

Section: Heating Exposurementioning

confidence: 99%

Assessment of Curing Exposures Effect on the Long-term Engineering Properties of Novel Lightweight Aggregate Concrete

Jannaty

Atrushi

2020

ARO

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At present, most of the generated waste expanded polystyrene (EPS) in developed countries are transported to landfill and in some developing and/or less-developed countries such as Iraq are sent to open landscapes; consequently, this inadequate waste disposal can be very dangerous to our health and environment. This study describes engineering properties of sustainable lightweight aggregate concrete (LWAC) incorporating novel aggregates of waste EPS produced by a unique recycling technique of densifying. The new recycling technique significantly improved the segregation resistance of EPS beads in concrete as these beads are ultra-light material. The novel LWA of densified EPS (DEPS) was used as partial natural aggregate replacement in the mixes. Three water/cement (W/C) ratios were used. Three different types of curing conditions of indoor full water curing, outdoor weathering exposure, and heating exposure were employed during this study to represent different conditions which concrete may be subject to. The engineering properties of concrete investigated were consistency, dry density, compressive strength, and ultrasonic pulse velocity (UPV) for long-term performance of more than one-year age. It was indicated that the properties of concrete were not only primarily influenced by the employed curing conditions but the content of DEPS in the mixtures and additionally the W/C ratio had effect on the properties of concrete. However, adequate engineering properties can be achieved using an appropriate amount of DEPS with proper W/C and curing conditions.

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Section: Heating Exposurementioning

confidence: 99%

Assessment of Curing Exposures Effect on the Long-term Engineering Properties of Novel Lightweight Aggregate Concrete

Jannaty

Atrushi

2020

ARO

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“…However, it should be recognized that the interpretation of data obtained in test reactor remains problematic in terms of direct application to light water reactors (LWRs) conditions, because: (1) The temperature and irradi-ation exposure can be significantly higher in test reactors. 2 (Baggio et al, 1995;Bary et al, 2008;de Morais et al, 2009), the amplitude of thermal expansions (Vodák et al, 2004), and the kinetics of shrinkage and creep in the cement paste (Maréchal, 1969). Also, the radiation-induced amorphization of ceramics is controlled by a critical temperature above which full amorphization cannot be reached (Zinkle, 2012).…”

Section: Introductionmentioning

confidence: 99%

Meso-scale modeling of irradiated concrete in test reactor

Giorla

Vaitová

Pape

et al. 2015

Nuclear Engineering and Design

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A numerical model accounting for the effects of neutron irradiation on concrete at the mesoscale is detailed in this paper. Irradiation experiments in test reactor (Elleuch et al., 1972), i.e., in accelerated conditions, are simulated. Concrete is considered as a two-phase material made of elastic inclusions (aggregate) subjected to thermal and irradiation-induced swelling and embedded in a cementitious matrix subjected to shrinkage and thermal expansion. The role of the hardened cement paste in the post-peak regime (brittle-ductile transition with decreasing loading rate), and creep effects are investigated. Radiation-induced volumetric expansion (RIVE) of the aggregate cause the development and propagation of damage around the aggregate which further develops in bridging cracks across the hardened cement paste between the individual aggregate particles. The development of damage is aggravated when shrinkage occurs simultaneously with RIVE during the irradiation experiment. The post-irradiation expansion derived from the simulation is well correlated with the experimental data and, the obtained damage levels are

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“…the chemical decompositions as a result of hydration processes (Mainguy et al 2000;Vydra et al 2001), and also under the change of external conditions (e.g. temperature (Lim and Mondal 2014;Vodák et al 2004), moisture (Saemann et al 2000), leading to the significant degradation of material properties. Those processes can seriously affect durability of the material (Chen et al 2010) so as to reduce the safety of radioactive wastes storage.…”

Section: Introductionmentioning

confidence: 99%