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 and distribution of 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: Long-Term Mechanical Properties of Different Fly Ash Geopolymers
Author(s): Chamila Gunasekara, Sujeeva Setunge, and David W. Law
Publication: Structural Journal
Appears on pages(s): 743-752
Keywords: compressive strength; elastic modulus; fly ash; geopolymer concrete; microstructure; tensile strength
Abstract:Geopolymer concrete is a sustainable construction material with the potential to act as a replacement for portland-cement (PC) concretes. A detailed investigation of the mechanical properties of four different fly ash geopolymer concretes was carried out up to 1 year of age. Compressive, flexural, and splitting tensile strengths, elastic modulus, and Poisson’s ratio of four geopolymer concretes at 1 year ranged between 28 and 88 MPa (4.06 and 12.76 ksi), 3.92 and 6.3 MPa (0.568 and 0.914 ksi), 1.86 and 4.72 MPa (0.27 and 0.684 ksi), 10.3 and 29 GPa (1493.5 and 4205 ksi), and 0.16 and 0.28, respectively. The results show an increase in performance observed between 90 and 365 days for all concretes depending on the fly ash properties. Tarong displayed the highest increase while Gladstone had the least, although Gladstone did display the best performance throughout. The nature of the gel matrix formed, in terms of uniformity and compactness, was observed to determine the mechanical properties. The nature of the interfacial transition zone formed between coarse aggregate and mortar and its density was observed to govern the tensile strength. An increase in porosity and microcracks was seen to negatively affect the compactness of the gel matrix, which in turn affected the elastic modulus.
Click here to become an online Journal subscriber