The Experts below are selected from a list of 84 Experts worldwide ranked by ideXlab platform
V C Pandolfelli - One of the best experts on this subject based on the ideXlab platform.
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microsilica or mgo grain size which one mostly affects the in situ spinel refractory castable expansion
Ceramics International, 2009Co-Authors: Mariana A. L. Braulio, P O Brant, L R M Bittencourt, V C PandolfelliAbstract:Microsilica is commonly added to alumina-magnesia castables to counterbalance the in situ spinel expansion. This effect is attained by the generation of a low-melting temperature phase, which also affects the Expansive Reaction kinetics. Additionally, the MgAl 2 O 4 formation depends on the grain size of the reactants. The use of coarse magnesia grains results in lower Mg 2+ dissolution and could lead, at 1500 °C, to forsterite development (Mg 2 SiO 4 ). For finer MgO, silica was detected at the edge of the spinel grains. Considering these aspects, this work evaluated the effect of microsilica content for different magnesia grain sizes (<45 or < 100 μm). Due to a faster spinel formation for the fine MgO source, microsilica counterbalanced the MgA1 2 0 4 expansion. Conversely, for the coarser MgO, silica increased the Mg 2+ dissolution, speeding up the spinel formation and expansion. Therefore, microsilica presented opposite roles, pointing out that it does not always counterbalance the spinel expansion. This work also indicated the need for a systemic approach for the expanding design of alumina―magnesia refractory castables.
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Microsilica or MgO grain size: Which one mostly affects the in situ spinel refractory castable expansion?
Ceramics International, 2009Co-Authors: Mariana A. L. Braulio, P O Brant, L R M Bittencourt, V C PandolfelliAbstract:Microsilica is commonly added to alumina-magnesia castables to counterbalance the in situ spinel expansion. This effect is attained by the generation of a low-melting temperature phase, which also affects the Expansive Reaction kinetics. Additionally, the MgAl 2 O 4 formation depends on the grain size of the reactants. The use of coarse magnesia grains results in lower Mg 2+ dissolution and could lead, at 1500 °C, to forsterite development (Mg 2 SiO 4 ). For finer MgO, silica was detected at the edge of the spinel grains. Considering these aspects, this work evaluated the effect of microsilica content for different magnesia grain sizes (
Mariana A. L. Braulio - One of the best experts on this subject based on the ideXlab platform.
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microsilica or mgo grain size which one mostly affects the in situ spinel refractory castable expansion
Ceramics International, 2009Co-Authors: Mariana A. L. Braulio, P O Brant, L R M Bittencourt, V C PandolfelliAbstract:Microsilica is commonly added to alumina-magnesia castables to counterbalance the in situ spinel expansion. This effect is attained by the generation of a low-melting temperature phase, which also affects the Expansive Reaction kinetics. Additionally, the MgAl 2 O 4 formation depends on the grain size of the reactants. The use of coarse magnesia grains results in lower Mg 2+ dissolution and could lead, at 1500 °C, to forsterite development (Mg 2 SiO 4 ). For finer MgO, silica was detected at the edge of the spinel grains. Considering these aspects, this work evaluated the effect of microsilica content for different magnesia grain sizes (<45 or < 100 μm). Due to a faster spinel formation for the fine MgO source, microsilica counterbalanced the MgA1 2 0 4 expansion. Conversely, for the coarser MgO, silica increased the Mg 2+ dissolution, speeding up the spinel formation and expansion. Therefore, microsilica presented opposite roles, pointing out that it does not always counterbalance the spinel expansion. This work also indicated the need for a systemic approach for the expanding design of alumina―magnesia refractory castables.
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Microsilica or MgO grain size: Which one mostly affects the in situ spinel refractory castable expansion?
Ceramics International, 2009Co-Authors: Mariana A. L. Braulio, P O Brant, L R M Bittencourt, V C PandolfelliAbstract:Microsilica is commonly added to alumina-magnesia castables to counterbalance the in situ spinel expansion. This effect is attained by the generation of a low-melting temperature phase, which also affects the Expansive Reaction kinetics. Additionally, the MgAl 2 O 4 formation depends on the grain size of the reactants. The use of coarse magnesia grains results in lower Mg 2+ dissolution and could lead, at 1500 °C, to forsterite development (Mg 2 SiO 4 ). For finer MgO, silica was detected at the edge of the spinel grains. Considering these aspects, this work evaluated the effect of microsilica content for different magnesia grain sizes (
L R M Bittencourt - One of the best experts on this subject based on the ideXlab platform.
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microsilica or mgo grain size which one mostly affects the in situ spinel refractory castable expansion
Ceramics International, 2009Co-Authors: Mariana A. L. Braulio, P O Brant, L R M Bittencourt, V C PandolfelliAbstract:Microsilica is commonly added to alumina-magnesia castables to counterbalance the in situ spinel expansion. This effect is attained by the generation of a low-melting temperature phase, which also affects the Expansive Reaction kinetics. Additionally, the MgAl 2 O 4 formation depends on the grain size of the reactants. The use of coarse magnesia grains results in lower Mg 2+ dissolution and could lead, at 1500 °C, to forsterite development (Mg 2 SiO 4 ). For finer MgO, silica was detected at the edge of the spinel grains. Considering these aspects, this work evaluated the effect of microsilica content for different magnesia grain sizes (<45 or < 100 μm). Due to a faster spinel formation for the fine MgO source, microsilica counterbalanced the MgA1 2 0 4 expansion. Conversely, for the coarser MgO, silica increased the Mg 2+ dissolution, speeding up the spinel formation and expansion. Therefore, microsilica presented opposite roles, pointing out that it does not always counterbalance the spinel expansion. This work also indicated the need for a systemic approach for the expanding design of alumina―magnesia refractory castables.
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Microsilica or MgO grain size: Which one mostly affects the in situ spinel refractory castable expansion?
Ceramics International, 2009Co-Authors: Mariana A. L. Braulio, P O Brant, L R M Bittencourt, V C PandolfelliAbstract:Microsilica is commonly added to alumina-magnesia castables to counterbalance the in situ spinel expansion. This effect is attained by the generation of a low-melting temperature phase, which also affects the Expansive Reaction kinetics. Additionally, the MgAl 2 O 4 formation depends on the grain size of the reactants. The use of coarse magnesia grains results in lower Mg 2+ dissolution and could lead, at 1500 °C, to forsterite development (Mg 2 SiO 4 ). For finer MgO, silica was detected at the edge of the spinel grains. Considering these aspects, this work evaluated the effect of microsilica content for different magnesia grain sizes (
P O Brant - One of the best experts on this subject based on the ideXlab platform.
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microsilica or mgo grain size which one mostly affects the in situ spinel refractory castable expansion
Ceramics International, 2009Co-Authors: Mariana A. L. Braulio, P O Brant, L R M Bittencourt, V C PandolfelliAbstract:Microsilica is commonly added to alumina-magnesia castables to counterbalance the in situ spinel expansion. This effect is attained by the generation of a low-melting temperature phase, which also affects the Expansive Reaction kinetics. Additionally, the MgAl 2 O 4 formation depends on the grain size of the reactants. The use of coarse magnesia grains results in lower Mg 2+ dissolution and could lead, at 1500 °C, to forsterite development (Mg 2 SiO 4 ). For finer MgO, silica was detected at the edge of the spinel grains. Considering these aspects, this work evaluated the effect of microsilica content for different magnesia grain sizes (<45 or < 100 μm). Due to a faster spinel formation for the fine MgO source, microsilica counterbalanced the MgA1 2 0 4 expansion. Conversely, for the coarser MgO, silica increased the Mg 2+ dissolution, speeding up the spinel formation and expansion. Therefore, microsilica presented opposite roles, pointing out that it does not always counterbalance the spinel expansion. This work also indicated the need for a systemic approach for the expanding design of alumina―magnesia refractory castables.
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Microsilica or MgO grain size: Which one mostly affects the in situ spinel refractory castable expansion?
Ceramics International, 2009Co-Authors: Mariana A. L. Braulio, P O Brant, L R M Bittencourt, V C PandolfelliAbstract:Microsilica is commonly added to alumina-magnesia castables to counterbalance the in situ spinel expansion. This effect is attained by the generation of a low-melting temperature phase, which also affects the Expansive Reaction kinetics. Additionally, the MgAl 2 O 4 formation depends on the grain size of the reactants. The use of coarse magnesia grains results in lower Mg 2+ dissolution and could lead, at 1500 °C, to forsterite development (Mg 2 SiO 4 ). For finer MgO, silica was detected at the edge of the spinel grains. Considering these aspects, this work evaluated the effect of microsilica content for different magnesia grain sizes (
A Montenero - One of the best experts on this subject based on the ideXlab platform.
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reuse of ground waste glass as aggregate for mortars
Waste Management, 2005Co-Authors: Valeria Corinaldesi, G Gnappi, G Moriconi, A MonteneroAbstract:Abstract This work was aimed at studying the possibility of reusing waste glass from crushed containers and building demolition as aggregate for preparing mortars and concrete. At present, this kind of reuse is still not common due to the risk of alkali–silica Reaction between the alkalis of cement and silica of the waste glass. This Expansive Reaction can cause great problems of cracking and, consequently, it can be extremely deleterious for the durability of mortar and concrete. However, data reported in the literature show that if the waste glass is finely ground, under 75 μm, this effect does not occur and mortar durability is guaranteed. Therefore, in this work the possible reactivity of waste glass with the cement paste in mortars was verified, by varying the particle size of the finely ground waste glass. No Reaction has been detected with particle size up to 100 μm thus indicating the feasibility of the waste glass reuse as fine aggregate in mortars and concrete. In addition, waste glass seems to positively contribute to the mortar micro-structural properties resulting in an evident improvement of its mechanical performance.
