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: Effect of Synthetic Fibers and Aggregate Size on Flexural Crack Widths
Author(s): Erik Stefan Bernard
Publication: Structural Journal
Appears on pages(s): 19-26
Keywords: aggregate size; corrosion; crack widths; fiber-reinforced concrete (FRC); flexure; testing
Abstract:Cracks can lead to corrosion of steel reinforcement, so limits are placed on maximum allowable in-service crack widths to reduce the likelihood of corrosion during the design life of a reinforced concrete (RC) member. The relatively light level of reinforcement required to meet strength requirements in some applications can result in quite wide in-service crack widths, so either additional steel bar reinforcement or fibers must be included to limit maximum crack widths. The mechanism by which fibers are believed to reduce crack widths in RC flexural members relies on the tensile stress generated by the fibers across cracks. Provided post-crack performance is satisfactory, fibers of any composition should be capable of reducing crack widths in RC members. This investigation has therefore assessed the influence of several high-performance macro-synthetic fibers on flexural crack widths in RC members and has also examined the influence of maximum aggregate size. The results indicate that for a moderate dosage rate (4.0 to 4.5 kg/m3 [6.7 to 7.6 lb/yd3]), the currently examined macro-synthetic fibers reduced flexural crack widths by approximately 20% compared to plain concrete. Maximum aggregate size was also found to influence mean crack spacing but had a negligible effect on crack width.
Click here to become an online Journal subscriber