مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Persian Verion
مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

video

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

sound

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Persian Version

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View:

131
مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Download:

0
مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Cites:

Information Journal Paper

Title

Effect of Microsilica and CFRP Fibers on Mechanical and Durability Properties of Ground Granulated Blast Furnace Slag –, Based Geopolymer Concrete

Pages

  207-218

Abstract

 Concrete is the most widely used building material in construction industry worldwide and its constituents are easily accessible everywhere. However, cement industry, as the producer of the primary binder of concrete, is one of the effective sources of environment degradation. Cement production needs extraction of mineral resources and burning fuel and causes extensive greenhouse emission due to disintegration of raw materials. Cement production alone is responsible for 7% of global CO2 emission with estimated annual growth of 4%. Toward environmental sustainability, one way is partially or totally replacing cement by waste or byproducts of other industries such as fly ash, ground granulated blast-furnace slag (GGBS), waste water, metakaolin, and silica fume. Geopolymer is a cementitious material with comparable characteristics to those of ordinary cement produced by alumina-and silica-rich waste materials. Therefore, it does not require energy-intensive and polluting calcination process. Geopolymerization is formed by reaction of silica-alumina under an alkaline solution which creates three dimensional Si-O-Al-O polymeric chains to attain compressive strength, compared to the ordinary cement which develops calcium silicate hydrates (C-S-H) as the main adhesive. Extensive research has conducted on Geopolymer concrete. However, more investigations are needed to better understand characteristics of Geopolymer concrete containing additives. Fibers have been proved to have a positive effect on mechanical strength of concrete. As well, fillers such as microsilica can improve mechanical and durability of concrete. Moreover, most studies in this area are focused on fly ash-based geopolymers and the investigations on GGBS-based geopolymer are rare in the literature. In this study, mechanical and durability of GGBS-based Geopolymer concrete containing CFRP Fibers and microsilica was investigated. Different concrete samples with 0-3% CFRP Fibers and 0-10% microsilica were prepared and experimentally tested. Sodium Hydroxide (NH) and Sodium Silicate (NS) solutions were used as alkali activators. 8 M NH as well as NS with 14. 7 Na2O and 29. 4 SiO2 were used with the NS/NH ratio of 2. 5. Since no standard existed for mix design of Geopolymer concrete, proposed mix design by Venkatesan and Pazhani was used. Alkaline to binder ratio of 0. 4 was selected with 430 kg/m 3 binder. The specimens were tested after 28 days of curing. Next, mechanical and durability tests including compressive strength, tensile strength, ultrasonic pulse velocity, water absorption, RCPT, and acid resistance were conducted on the samples. Also, microstructure of the Geopolymer concrete was investigated. Results of experimental tests show that, compressive and tensile strength of geopolymer samples decreased by adding microsilica. However, 5% microsilica was the best value to enhance mechanical properties of Geopolymer concrete. On the other hand, microsilica could enhance durability properties of Geopolymer concrete so that adding 5% microsilica caused moderate improvement of water absorption and chloride penetration. The greatest impact of microsilica was on acid resistance by which adding 5% microsilica resulted in 88% improvement of compressive strength loss. However, unlike the microsilica, CFRP Fibers due to the disruption of concrete integrity had detrimental effect on mechanical properties and durability of the Geopolymer concrete. On the other point of view, microstructure study showed that all the specimens had micro cracks that could inversely affect the performance of concrete. Also, SEM images showed that there was not a strong bond between CFRP Fibers and binder paste which results low performance of concrete specimens containing fibers.

Cites

  • No record.

    • References

  • No record.

    • Cite

    APA: Copy

    Najmi, Shayan, Rahbari, Abtin, Darvishan, Ehsan, & Adabi, Mohsen. (2020). Effect of Microsilica and CFRP Fibers on Mechanical and Durability Properties of Ground Granulated Blast Furnace Slag –, Based Geopolymer Concrete. MODARES CIVIL ENGINEERING JOURNAL, 20(5 ), 207-218. SID. https://sid.ir/paper/1036790/en

    Vancouver: Copy

    Najmi Shayan, Rahbari Abtin, Darvishan Ehsan, Adabi Mohsen. Effect of Microsilica and CFRP Fibers on Mechanical and Durability Properties of Ground Granulated Blast Furnace Slag –, Based Geopolymer Concrete. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2020;20(5 ):207-218. Available from: https://sid.ir/paper/1036790/en

    IEEE: Copy

    Shayan Najmi, Abtin Rahbari, Ehsan Darvishan, and Mohsen Adabi, “Effect of Microsilica and CFRP Fibers on Mechanical and Durability Properties of Ground Granulated Blast Furnace Slag –, Based Geopolymer Concrete,” MODARES CIVIL ENGINEERING JOURNAL, vol. 20, no. 5 , pp. 207–218, 2020, [Online]. Available: https://sid.ir/paper/1036790/en

    Related Journal Papers

  • No record.

    • Related Seminar Papers

  • No record.

    • Related Plans

  • No record.

    • Recommended Workshops






    Move to top
    telegram sharing button
    whatsapp sharing button
    linkedin sharing button
    twitter sharing button
    email sharing button
    email sharing button
    email sharing button
    sharethis sharing button