Experimental, analytical, and simulation studies of modified concrete

The selected fine powdered boron carbide was found to be beneficial to the physic-mechanical properties of concrete as it enhances the cement hydration reaction due to the …

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Synthesis and characterization of goethite and goethite–hematite

The potentiometric titrations of goethite dispersions (1 or 2 g/50 cm 3; more concentrated dispersions become very viscous) were carried out in a thermostated Teflon …

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Comparison of properties of jarosite, goethite and …

Examples for the arising residues are jarosite or goethite precipitates from nickel or zinc production but also red mud from aluminum production.

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Premature Stiffening of Cement Paste Caused by Secondary …

It should be noted that the shape of goethite is similar to that of gypsum [6, 23], and thus the addition of goethite in cement can cause problem similar to the false set. As …

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Development of High- Performance Heavy Density Concrete …

performance concrete (HPC- grade M60), All concrete mixes had a constant water/cement ratio of 0.35; cement content of 450 kg/m3 and sand-to-total aggregate ratio of 40 %. Concrete …

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Microstructural characterization and mechanical properties of cement

4.2 Differential thermal analysis. The soil DTA curve (Fig. 3) showed endothermic effects at 85, 348, 537 and 567°C.These effects are associated with the loss of hydration …

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304.3R-20: Heavyweight Concrete: Measuring, Mixing, …

the portland cement, supplemental cementitious materials can provide hydrogen that is "locked in" during the process of hydration (Davis 1972a). Once the cement is hydrated, the water of …

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كم عن صخرة محطم

صخرة محطم محطم متر مربع. سعر محطم طن كم قدم مكعب في طن من كسارة تشغيل. الكسارة الفكية سعر, طن من 50 500 كسارة الحجر, صخرة محطم من 250 طن في الساعة على, كم أكياس من كسارة المدى لكل متر مكعب تحويل مكعب متر إلى قدم مكعب, مكعب ...

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Application of thermodynamic modelling to hydrated cements

The application of thermodynamic methods to investigate cement hydration has a long tradition. Initial attempts to study cementitious systems back in 1965 concentrated on …

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Competitive kinetics of Ni(II)/Co(II) and Cr(VI)/P(V) adsorption and

Goethite is an iron oxy-hydroxide mineral in soil and sediment that plays an important role in the fate and transport of heavy metals (Fischer et al., 2007, Wu et al., 2020, …

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Goethite In Cement Hydration

The selected fine powdered boron carbide was found to be beneficial to the physic-mechanical properties of concrete as it enhances the cement hydration reaction due to the filler effect; …

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Effect of PCs superplasticizers on the rheological properties and

The effect of polycarboxylate (PC) superplasticizers with different structure on the rheological properties and hydration process of slag-blended cement pastes with a slag …

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Experimental, analytical, and simulation studies of modified …

After that, a designed mix which comprised barite/goethite aggregates plus fine‐powdered boron carbide additive, was proposed to improve the overall radiation shielding properties and in the...

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Advances in understanding cement hydration mechanisms

However, the most conclusive evidence against the impingement theory is the very weak effect of water to cement ratio on the main hydration peak. The main hydration peak …

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The kinetics and reaction mechanism of the goethite to …

tion in goethite has not been observed in nature but is common in synthetics (e.g. Cornell and Mann, 1983). Twinning in hematite produced from goethite is common and forms an important …

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Long-term cement hydration studies with isothermal calorimetry

The long-term strength increase of moist cured concrete is a classic example that cement hydration generally continues for a long time. Two examples: Sivasundaram et al. [9] …

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Cement hydration

Hydration products. The products of the reaction between cement and water are termed "hydration products." In concrete (or mortar or other cementitious materials) there are typically …

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Effects of the Goethite Surface Hydration …

In this study, the first-principles density functional theory calculations were used to reveal the role of the hydration of the goethite surface and its effects on flotation reagents from a microscopic perspective.

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Evaluation of ultrafine calcined clays on LC3 cements on the …

The role of temperature calcination may highly affect microstructural changes in porosity and superficial surface area of Al–Fe-calcined clays [9,10,11] and will further affect …

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The kinetics and reaction mechanism of the goethite to hematite

At early stages and lower temperatures, the mechanism is one of proton/iron transfer across the reaction interface. Important goethite characteristics are grain size, shape, …

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Crushed stone dust grading results. | Download Table

The results revealed that all concrete mixes; goethite-limonite concrete (G.L), barite-limonite (B.L), steel slag-limonite (S.L) and dolomite concrete (D.C) had good physical and mechanical ...

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Mechanical properties and hydration mechanism of high-volume …

The results show that ultra-fine treatment activates the hydration of IOT; however, the hydration activity of IOT is still weaker than Portland cement and the addition of inert …

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Comparison of Methods for Arresting Hydration of Cement: …

Discover the intricacies of cement hydration and effective methods to arrest it in our comprehensive article. Learn how hydration transforms cement into solid rock while posing …

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Mechanisms of cement hydration

The current state of knowledge of cement hydration mechanisms is reviewed, including the origin of the period of slow reaction in alite and cement, the nature of the …

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Use of Raman spectroscopy to characterize the effect of …

These peaks indicate the formation of goethite due to the oxidation of the mineral sulfide used as an addition in the cement paste. ... Using Raman spectra, it was possible to …

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Development of high-performance heavy density concrete using …

This leads to an increase in the compressive strength of concrete. Also, the hydration products possess a large specific volume than the unhydrated cement phases; ... On …

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Full article: Development of high-performance heavy density concrete

It is evident also from Fig. 2 that, the concrete mixes made from the coarse aggregates of goethite and containing 10% SF (G1) and 20% FA (G2) meet the requirements …

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Development of high-performance heavy density concrete using …

On the contrary, the concrete mixes made with goethite and serpentine coarse aggregate along with 10% SF, 20% FA and 30% GGBS did not satisfy the requirements of …

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(A) The sharp mineralogically induced color contrast …

Download scientific diagram | (A) The sharp mineralogically induced color contrast between the goethite-dominated canga horizon (orange) and the friable specular hematite saprolite (blue-grey ...

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Sericitic Phyllite as Addition in Portland Cement

The cementitious and pozzolanic materials interact chemically and physically with the Portland cement hydration products, ... In the range between 200 and 300ºC, there is mass loss due to …

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GEMS workshop 2020

Single file - hydration of Portland cement Hydration of a Portland cement The example will show the principle possibility to apply GEMS to simulate cement hydration. A cement composition …

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Microstructure of Fe(OH)3 phase in hydration products of calcium

During hydration of plain cement portlandite and hydration products form below 450°С. Silica fume and fly ashes react with portlandite and form products decomposing above …

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