In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
ACI World Headquarters
38800 Country Club Dr.
Farmington Hills, MI
ACI Middle East Regional Office
Second Floor, Office # 02.01/07
The Offices 02 Building, One Central
Dubai World Trade Center Complex
Phone: +971.4.516.3208 & 3209
Chat with Us Online Now
Feedback via Email
Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Experimental Study of Carbonation Resistance of Alkali- Activated Slag Concrete
Author(s): Ying-Hua Bai, Sheng Yu, and Wei Chen
Publication: Materials Journal
Appears on pages(s): 95-104
Keywords: alkali slag concrete; carbonated; hydrotalcite; MgO
Abstract:This paper studies the effect of carbonation resistance on alkali-activated slag (AAS) concrete. To be specific, this paper investigates the effect of alkali content and type of activators on the carbonation depth of AAS concrete, and analyzes the changes in volume stability, water absorption rate, and carbonation depth of the AAS system after the addition of active MgO. As is shown by the results, while early carbonation is slower, the later carbonation rate of concrete with a high alkali content is higher than that of concrete with a low alkali content. After 28 days and 56 days, the carbonation depth with NaOH as the activator is smaller than that with sodium silicate as the activator; the strength of concrete after carbonation is slightly increased when sodium silicate is used as the activator. The addition of 3% active MgO decreased the water absorption rate of slurry, reduced the shrinkage of concrete, and improved the impermeability of concrete. Moreover, the incorporation of active MgO promoted the formation of hydrotalcite-like compounds and retarded the decomposition of C-S-H gel, thereby reducing the carbonation degree of concrete.
Click here to become an online Journal subscriber