Journal ArticleDOI
The use of thermal analysis in assessing the effect of temperature on a cement paste
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TLDR
In this article, the effect of temperature in the mineralogical composition of cement hydration products has been studied using thermogravimetric analysis (TGA) and DTG curves, which can be used to determine fire conditions and the consequent deterioration expected in the cement paste.About:
This article is published in Cement and Concrete Research.The article was published on 2005-03-01. It has received 709 citations till now. The article focuses on the topics: Cement & Portlandite.read more
Citations
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Elucidation of Conduction Mechanism in Graphene Nanoplatelets (GNPs)/Cement Composite Using Dielectric Spectroscopy.
Guido Goracci,Jorge S. Dolado +1 more
TL;DR: The results support that the increase of direct current in OPC/GNPs is due to pore refinement induced by graphene nanoplatelets, and the study of the dielectric properties suggests that the main contribution to conduction is given by water diffusion through the porous network resulting in ion conductivity.
Journal ArticleDOI
Rapid method for measuring the water absorption of recycled aggregates
Bruno Luís Damineli,Marco Quattrone,Sérgio Cirelli Angulo,Maria Elena Santos Taqueda,Vanderley Moacyr John +4 more
TL;DR: In this paper, the authors presented a rapid and accurate method to measure water absorption of RAs, combining 0.5h vacuum saturation with 2h microwave oven drying kinetics.
Journal ArticleDOI
Pore Structure Changes in Hardened Cement Paste Exposed to Elevated Temperature
TL;DR: In this article, hardened Portland cement pastes were exposed to elevated temperatures of 200, 400, 600, 800, and 1000℃ for 60 minutes, and the resulting damage was studied by thermogravimetry (TG), mercury intrusion porosimetry, and density measurements.
Journal ArticleDOI
Mechanical and physical performances of concretes made from crushed sands of different geological nature subjected to high temperatures
Tchapga Gnamsi Guy Molay,Mambou Ngueyep Luc Leroy,Mambou Ngueyep Luc Leroy,Tchoffo Fidele,Hamidou Gilbert Franck,Ndjaka Jean Marie bienvenu +5 more
TL;DR: In this article, the performance of concretes made from crushed sands of different petrographic nature subjected to high temperatures was evaluated and compared with reference values obtained at high temperature: compressive and splitting tensile strengths, loss mass, water absorption by immersion, porosity, density, variation of volume.
References
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Compressive strength of concrete at high temperatures: a reassessment
TL;DR: In this paper, a reassessment of the subject is given, which considers material and environmental factors/mechanisms influencing the strength of concrete during the heat cycle and after cooling, not all of which necessarily result in strength loss.
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Thermal stability and decomposition mechanisms of ettringite at <120°C
Q. Zhou,Fredrik P. Glasser +1 more
TL;DR: In this article, the decomposition and reformation of ettringite is studied as a function of water vapour pressure and temperature, and the authors make recommendations for the upper safe service limits for ETTringite-based cements.
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Physicochemical, mineralogical, and morphological characteristics of concrete exposed to elevated temperatures
TL;DR: In this paper, the effect of elevated temperatures on the mineralogical changes occurring in the hydrated phases of concrete cubes were studied by measuring ultrasonic pulse velocity (UPV) and consequent deterioration in the compressive strength with increase in temperature.
Journal ArticleDOI
Differential scanning calorimetry study of ordinary Portland cement
Wei Sha,E.A. O’Neill,Z. Guo +2 more
TL;DR: In this article, the thermal behavior of hydration products in ordinary Portland cement as a function of age was investigated using differential scanning calorimeter (DSC) and X-ray diffraction analysis.
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Elastic properties of high alumina cement castables from room temperature to 1600°C
TL;DR: In this article, high-alumina refractory castables with compositions in the systems CaO-Al2O3 and CaO−Al 2O3-SiO2 were studied using an ultrasonic technique.