Effect of CO2 concentration on strength development and carbonation of a MgO-based binder for treating fine sediment

• Published in: Environmental science and pollution research international Vol. 25; no. 23; pp. 22552 - 22560
• Main Authors: Hwang, Kyung-Yup, Kim, Jin Young, Phan, Hoang Quang Huy, Ahn, Jun-Young, Kim, Tae Yoo, Hwang, Inseong
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.08.2018; Springer Nature B.V
• Subjects: Aquatic Pollution; Atmosphere; Atmospheres; Atmospheric Protection/Air Quality Control/Air Pollution; Brucite; Calcium; Calcium silicate hydrate; Calcium silicates; Carbon dioxide; Carbonation; Compressive strength; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental science; Hydrates; Hydration; Magnesium hydroxide; Magnesium oxide; Mechanical properties; pH effects; Portland cement; Portland cements; Research Article; Sediments; Waste Water Technology; Water Management; Water Pollution Control; Compressive strength; Solidification/stabilization; Dredged sediment; Carbon storage; Magnesium oxide; Accelerated carbonation
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-018-2338-y

We previously described a MgO-based binder for treating fine sediment and simultaneously store CO 2 . Here, we describe a study of the physical/mechanical characteristics and carbonation reactions of the MgO-based binder used to solidify/stabilize fine sediment in atmospheres containing different CO 2 concentrations. Carbonation of the sediment treated with the MgO-based binder at the atmospheric CO 2 concentration markedly improved the compressive strength of the product. The compressive strength was 4.78 MPa after 365 days of curing, 1.3 times higher than the compressive strength of sediment treated with portland cement. This improvement was caused by the formation of carbonation products, such as hydromagnesite, nesquehonite, and lansfordite, and the constant high pH (~ 12) of the specimen, which favored the growth of hydration products such as calcium silicate hydrates and portlandite. Very low compressive strengths were found when 50 and 100% CO 2 atmospheres were used because of excessive formation of carbonation products, which occupied 78% of the specimen depth. Abundant carbonation products increased the specimen volume and decreased the pH to 10.2, slowing the growth of hydration products. The absence of brucite in specimens produced in a 100% CO 2 atmosphere indicated that MgO carbonation is favored over hydration at high CO 2 concentrations.