@Article{jrm.2022.020636,
AUTHOR = {Xiaoling Qu, Xingshuo Yang, Siqi Li, Changan Tian, Zaibo Li, Zhiguang Zhao},
TITLE = {Preparation and Properties of Eco-Friendly Aerated Concrete Utilizing High-Volume Fly Ash with MgO and CaO Activators},
JOURNAL = {Journal of Renewable Materials},
VOLUME = {10},
YEAR = {2022},
NUMBER = {12},
PAGES = {3335--3350},
URL = {http://www.techscience.com/jrm/v10n12/48811},
ISSN = {2164-6341},
ABSTRACT = {The associated MgO in limestone is believed to affect the volume stability of cementitious materials at room temperature, which limits the utilization of low-grade limestone. In this study, MgO was used as an alkali activator
instead of partial CaO to prepare the aerated concrete under hydrothermal conditions. The expansion process was
studied to evaluate the influence of the raw materials on the gas forming stability of the slurry. The pore structure
(porosity, pore size and its distribution) was analyzed by the image method. The physic-mechanical properties
(density, strength, thermal properties) of concrete with the addition of MgO were comprehensively investigated.
Besides, the mineral compositions and morphology of the hydration products were analyzed to demonstrate the
influence mechanism of MgO on the mechanical properties. Experimental results show that the final expansion
rate of the slurry decreases with MgO content. A reasonable MgO content, i.e., MgO/(MgO + CaO) < 20%, contributes to improve the compressive strength, attributing to an increased reaction rate to C-S-H gel and tobermorite. The addition of MgO causes the thermal conductivity and specific heat to increase. The pore structure is
mainly related to the amount of air-entraining agent. This study has a significance for the further utilization
of magnesium-rich carbonates in the autoclaved building products.},
DOI = {10.32604/jrm.2022.020636}
}