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.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
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: Reuse of Returned Concrete by Hydration Control: Characterization of a New Concept
Author(s): F. D. Kinney
Publication: Special Publication
Appears on pages(s): 19-40
Keywords: activators; chemical compounds; circulation; concretes; hydration; performance; ready-mixed concrete; retempering; stabilizers (agents); Materials Research
Abstract:Discusses a chemical approach to dealing with returned concrete that has the potential of reducing the amount of waste in concrete production to a level unmatched by other methods. This approach allows use of concrete up to 72 hr after batching and the reduction of wash-out slurry and reclaimer debris. This two-part chemical system is comprised of a stabilizer that strongly retards the hydration of all clinker minerals and a hydration initiator or activator added to stabilized concrete prior to its placement. Data presented on commercial portland cement and individual clinker minerals treated with this system show the effects of the stabilizer and initiator on the different clinker phases and were drawn from calorimetry, x-ray diffraction, and SEM studies. Control of nucleation and nuclei growth are proposed as the mechanism by which the chemical system works. Data from field-batched mixes demonstrate that the plastic and hardened properties of concrete made using this chemical system are no different than those of conventionally batched concrete.
Click here to become an online Journal subscriber