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Properties Of Concrete
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Citations
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Low-field permanent magnets for industrial process and quality control.
TL;DR: The current state-of-the-art in low-field NMR hardware and experiments are presented, considering general magnet designs, rf performance, data processing and interpretation, and guidance on obtaining the optimum results from these instruments is provided.
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Sewage sludge ash characteristics and potential for use in concrete
TL;DR: Sewage sludge ash (SSA) use in concrete related applications is assessed through systematic review involving analysis and evaluation of the global literature found published since 1983 as mentioned in this paper The material characteristics indicate potential for various applications: in small dosages as raw feed in Portland cement production, as fine and filler aggregates, or in ground form as cement component, with manageable effects on performance using manufactured SSA aggregate.
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SCC modification by use of amorphous nano-silica
TL;DR: In this paper, two different types of nano-silica (nS) were applied in self-compacting concrete (SCC), both having similar particle size distributions (PSD), but produced through two different processes: fumed powder silica and precipitated silica in colloidal suspension.
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Formation of magnesium silicate hydrate (M-S-H) cement pastes using sodium hexametaphosphate
TL;DR: In this article, it is shown that M-S-H pastes can be prepared by reacting magnesium oxide (MgO) and silica fume (SF) at low water to solid ratio using sodium hexametaphosphate (NaHMP) as a dispersant.
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Strength, stiffness and ductility of concrete-filled steel columns under axial compression
TL;DR: In this article, a finite element model was used to generate simulation data covering a wide range of parameters for circular and rectangular CFST stub columns under axial compression, and regression analysis was conducted to predict the compressive strength, the compositional stiffness, and compressive strain for the composite columns, and the capacity reduction factors for the steel and concrete materials were recalibrated to achieve a target reliability index of 3.04 when considering resistance effect only.
References
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Journal ArticleDOI
Properties of Concrete at Elevated Temperatures
TL;DR: In this paper, the thermal, mechanical, deformation, and spalling properties of concrete are discussed, and various properties that influence fire resistance performance, together with the role of these properties on fire resistance, are discussed.
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Development of an eco-friendly Ultra-High Performance Concrete (UHPC) with efficient cement and mineral admixtures uses
TL;DR: In this paper, a modified Andreasen & Andersen particle packing model is used to achieve a densely compacted cementitious matrix, and the results show that the influence of FA, ground granulated blast-furnace slag (GGBS) and limestone powder (LP) on the early hydration kinetics of UHPC is very similar during the initial five days, while the hydration rate of the blends with GGBS is mostly accelerated afterwards.
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Carbonation of cement paste : Understanding, challenges, and opportunities
Branko Šavija,Mladena Luković +1 more
TL;DR: In this article, a review summarises the state of the art regarding the understanding and consequences of carbonation of cement paste and summarises recent efforts regarding active use of carbonations as a tool for manipulating certain properties of cement based materials.
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High-performance fiber-reinforced concrete: a review
TL;DR: In this article, the authors present a comprehensive review of the mechanism of crack formation and propagation, compressive strength, modulus of elasticity, stress-strain behavior, tensile strength (TS), flexural strength, drying shrinkage, creep, electrical resistance, and chloride migration resistance of high performance fiber reinforced concrete.
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Investigation of coal bottom ash and fly ash in concrete as replacement for sand and cement
TL;DR: In this paper, the authors investigated the use of coal ash in concrete to replace sand with bottom ash waste and cement with fly ash and concluded that those experimental concrete mixes can be used in several structures (foundations, subbases, pavements, etc.) which will minimize the cost, energy and environmental problems to a great extent.