Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Improving the performance of reactive MgO cement-based concrete mixes
Highlights Quantity and morphology of carbonates determine the performance of MgO cement mixes. Low hydration and high water demand of MgO limits strength gain in concrete mixes. Inclusion of hydration agent enhanced MgO hydration, carbonation and strength gain. Dispersant agent use reduced water demand, improved morphology and performance. 28day strength of MgO concrete mixes containing these agents increased by over 50%.
Abstract Low hydration and high water demand of MgO limits strength gain in MgO cement-based formulations. This study enhanced the microstructure and performance of MgO concrete mixes by increasing hydration and lowering water demand via the introduction of hydration (HA) and dispersion (DA) agents. Hydration and carbonation mechanisms were evaluated by isothermal calorimetry, TGA, XRD, FTIR and SEM. HA increased MgO dissolution and brucite precipitation. DA reduced water content and resulted in denser microstructures by increasing CO2 diffusion. Formation of dense carbonate networks with improved morphologies resulted in 28-day strengths of 45MPa, which were >50% higher than the control sample.
Improving the performance of reactive MgO cement-based concrete mixes
Highlights Quantity and morphology of carbonates determine the performance of MgO cement mixes. Low hydration and high water demand of MgO limits strength gain in concrete mixes. Inclusion of hydration agent enhanced MgO hydration, carbonation and strength gain. Dispersant agent use reduced water demand, improved morphology and performance. 28day strength of MgO concrete mixes containing these agents increased by over 50%.
Abstract Low hydration and high water demand of MgO limits strength gain in MgO cement-based formulations. This study enhanced the microstructure and performance of MgO concrete mixes by increasing hydration and lowering water demand via the introduction of hydration (HA) and dispersion (DA) agents. Hydration and carbonation mechanisms were evaluated by isothermal calorimetry, TGA, XRD, FTIR and SEM. HA increased MgO dissolution and brucite precipitation. DA reduced water content and resulted in denser microstructures by increasing CO2 diffusion. Formation of dense carbonate networks with improved morphologies resulted in 28-day strengths of 45MPa, which were >50% higher than the control sample.
Improving the performance of reactive MgO cement-based concrete mixes
Dung, N.T. (Autor:in) / Unluer, C. (Autor:in)
Construction and Building Materials ; 126 ; 747-758
21.09.2016
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Improving the performance of reactive MgO cement-based concrete mixes
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Improving the performance of reactive MgO cement-based concrete mixes
| British Library Online Contents | 2016
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