Mechanical and durability properties of steel, polypropylene and polyamide fiber reinforced slag-based alkali-activated concrete


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Kuranli O. F. , Uysal M. , Abbas M. T. , Cosgun T., Nis A., Aygörmez Y. , ...More

EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING, 2022 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Publication Date: 2022
  • Doi Number: 10.1080/19648189.2022.2031302
  • Journal Name: EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED)
  • Keywords: GGBS, alkali-activated concrete, steel fiber, synthetic fibers, high-temperature, freeze-thaw, HIGH-TEMPERATURE BEHAVIOR, GEOPOLYMER CONCRETE, FLEXURAL BEHAVIOR, PERFORMANCE, RESISTANCE
  • Yıldız Technical University Affiliated: Yes

Abstract

Alkali-activated composites are significant materials in reducing CO2 emissions and ensuring sustainability. With the increasing concerns about climate change globally, the interest in alkali-activated materials has also increased. Researching different fibers has very important potential in this area. This study aims to make alkali-activated concretes widespread in the concrete sector by using the materials common in conventional concretes and ensuring that alkali-activated concretes are an alternative in terms of sustainability. Experimental studies were conducted to examine the mechanical, durability, and microstructural properties (SEM) of slag-based alkali-activated concrete (AASC) reinforced with three various fibers. The fibers, polypropylene (PP), polyamide (PA), and steel (ST), were used with two ratios (%0.4 and %0.8 by vol.). Compressive, splitting tensile, and flexural strength tests were carried out at 28 and 90 days. In terms of durability properties, the samples were exposed to high temperatures (300-600-900 degrees C) and freeze-thaw test (250 cycles). The results showed that the addition of fibers improved the strength and durability properties; for instance, the existence of steel and polypropylene fibers increased the flexural toughness factor values by 430% and 260%, respectively. Moreover, the compressive strength of the fibrous samples exposed to 900 degrees C was obtained in the range of 6-23 MPa.