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: Service-Load Behavior of Precast/Prestressed Concrete Beams with Recycled Concrete Aggregates
Author(s): Michael R. Brandes and Yahya C. Kurama
Publication: Structural Journal
Appears on pages(s): 861-873
Keywords: creep; precast concrete; prestress loss; prestressed concrete; shrinkage; recycled concrete aggregate (RCA); sustained service load; time-dependent deflection
Abstract:This paper describes an experimental investigation on the use of recycled concrete aggregates (RCAs) as replacement for coarse natural aggregates (NAs) in precast/prestressed concrete structures. Specifically, sustained service load tests were conducted on 18 pretensioned beams with two different levels of RCA (50% and 100% by aggregate volume), two sources of high-quality RCA (from both rejected precast members and a construction demolition recycling yard), two different concrete mixture designs, concrete ages of 7 days and 28 days at superimposed service loading, and two different levels of prestressing (to result in beams that are uncracked or cracked under the superimposed load). The loss of prestress over time and midspan deflections of the beam specimens were monitored. Creep and shrinkage strains of accompanying concrete cylinders were also measured. The results showed that the effect of RCA on the service-load behavior of the beams was modest, even at full (100%) aggregate replacement. Additionally, the ability of current code approaches to estimate the measured immediate and sustained load deflections of the beams was not affected by the use of RCA.
Click here to become an online Journal subscriber