Hydration, carbonation, strength development and corrosion resistance of reactive MgO cement-based composites

Municipal Solid Waste Incineration Ash-Incorporated Concrete: One Step towards Environmental Justice

“…Concentrated CO 2 is precious and in a shortage in the concrete industry. Concentrated CO 2 is the key raw material of many types of alternative cement (e.g., carbonated MgO cement [136][137][138], CaCO 3 -based cement [139,140], carbonated wollastonite [141], and carbonated magnesium silicate [142]). The hardening and strength development of the carbonation-based cement systems rely on the uptake of concentrated CO 2 .…”

Bacteria-induced internal carbonation of reactive magnesia cement

“…Although PC pastes present a relatively harsh environment for bacteria due to their high alkalinity that can inactivate bacteria [34], the lower pH of RMC pastes than those of PC pastes could present an advantage for bacterial activity. Previous studies [5] have reported the pH of the pore solution of RMC pastes without carbonation to range between 10.2 and 10.5.…”

“…The production of PC leads to the release of large quantities of CO2, taking up roughly 8% of global anthropogenic CO2 emissions [2]. To reduce the emissions from cement production, the use of alternative binding materials has been proposed [3][4][5]. Reactive magnesia cement (RMC), which has lower calcination temperatures than PC, i.e., 700-900°C vs. 1450°C [6], is one of the potential alternatives.…”

Advances in the hydration of reactive MgO cement blends incorporating different magnesium carbonates

“…The sequestration of CO 2 within hydrated RMC formulations leads to hydrated magnesium carbonates (HMCs) that provide a dense microstructure and establish a binding network, leading to strength development [9][10][11]. Some of the common HMCs in RMC formulations are nesquehonite (MgCO 3 Á3H 2 O), artinite (Mg 2 CO 3 (OH) 2 Á3H 2 O) and hydromagnesite (Mg 5 (CO 3 ) 4 Á(OH) 2 Á 4H 2 O) [12,13]. The hydration of RMC, influenced by factors such as the crystal size and surface area of RMC that determine its reactivity, is a critical process in the formation of HMCs.…”