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
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: The Activation of Class C-, Class F-Fly Ash and Blast Furnace Slag Using Geopolymerisation
Author(s): H. Xu, G. C. Lukey, and J. S. J. van Deventer
Publication: Special Publication
Appears on pages(s): 797-820
Keywords: activation; ASTM Class F and C fly ashes; blast-furnace slag; geopolymers
Abstract:An investigation of the activation of Class C and Class F fly ash as well as granulated blast furnace slag has established that the amount and nature of the calcium containing phases in these materials significantly affect the activation mechanism. The majority of calcium in blast furnace slag is associated with either Si or with S and it can be activated either by use of a highly alkaline solution or by an alkaline solution containing soluble silicate to produce a solid material having sufficient mechanical strength. Class C fly ash contains calcium that is partly structured with aluminium and silicon and it has been found that this class of fly ash can only be activated using a highly alkaline solution containing soluble silicate. It has been observed that Class F fly ash cannot be successfully activated by either a highly alkaline solution or an alkaline soluble silicate solution, but by a very highly alkaline soluble silicate solution. It is proposed that the poor activation of Class F fly ash is due to this material having significantly lower calcium content than either blast furnace slag or Class C fly ash and that the calcium is in an isolated form.
Click here to become an online Journal subscriber