Engineering and Technology Journal

Studying the Possibility of Producing Paving Flags from Geopolymer Concrete Containing Local Wastes

Document Type : Research Paper

Authors

Civil Engineering Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.

Abstract

Geopolymer concrete is an inorganic composite material created by interacting alkaline substances with an aluminosilicate source and aggregate. Precast building units are considered the most prominent uses of geopolymer concrete, and the utilization of recycled steel fibres and rubber from damaged tires that are non-biodegradable to reduce environmental pollution. The results of this investigation show the possibility of using geopolymer concrete with and without the inclusion of crumbed rubber and recycled steel fibers from damaged tires in the production of paving flags with dimensions of 400 × 200 × 50 mm class c according to IQS 1107. Four types of geopolymer concrete flags were prepared, including flag specimens without wastes, flag specimens reinforced with recycled steel fibres waste from damaged car tires with a volume fraction of 0.125%, flag specimens containing 10% crumbed rubber waste aggregate as a partial volumetric replacement to natural coarse aggregate, as well as flag specimens containing two wastes of 10% crumbed rubber as a partial replacement to natural coarse aggregate and 0.125% recycled steel fibres. The experimental tests illustrate that it is possible to reduce the thickness from 50 mm to 35 mm of the paving flags to reduce their weight and cost. In addition, it was discovered that the total flexural energy of paving flags containing recycled steel fibers and rubber aggregate wastes increased by 390% and 271%, respectively, concerning paving flags without wastes. The failure modes changed from brittle to ductile when these wastes were used. 

Graphical Abstract

Highlights

  • Producing paving flags from modified MK-based GPC and containing different waste materials according to IQS 1107
  • Studying properties of GPC paving flags that contain recycled rubber wastes and/or steel fibers from the damaged tires
  • Rupture load, weight, and total flexural energy are improved for GPC paving flags by including waste materials
  • Achieving sustainability by using GPC  without cement, and they save the environment from damaged tire waste

Keywords

Main Subjects

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Engineering and Technology Journal
Volume 41, Issue 11
Civil Engineering
15 articles
November 2023
Page 1325-1336
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