Physical and mechanical properties of metakaolin-based geopolymer mortars containing various waste powders


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Kabirova A., Uysal M. , Hüsem M., Aygörmez Y. , Dehghanpour H., Pul S., ...More

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

  • Publication Type: Article / Article
  • Publication Date: 2022
  • Doi Number: 10.1080/19648189.2022.2050303
  • Journal Name: EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
  • Journal Indexes: Science Citation Index Expanded
  • Keywords: Metakaolin-based geopolymer, limestone powder, basalt powder, waste marble powder, recycled aggregate powder, ALKALI-ACTIVATED SLAG, FLY-ASH, RECYCLED AGGREGATE, MICROSTRUCTURAL PROPERTIES, COMPRESSIVE STRENGTH, CONCRETE STRENGTH, FLEXURAL STRENGTH, SILICA FUME, PERFORMANCE, CEMENT

Abstract

In this paper, it was aimed to evaluate the effectiveness of four different types of filler materials with particle sizes below 63 mu m in sustainable geopolymer mortars. For this purpose, 25%, 50%, and 75% limestone powder (LSP), basalt powder (BP), waste marble powder (WMP), and recycled aggregate powder (RAP) were substituted with river sand and 13 different mixtures including reference were obtained. Metakaolin was used as the main binder material, and sodium hydroxide/sodium silicate was used in a ratio of 1:2 as an activator. In addition, blast furnace slag was added to the mixture as a reaction accelerator at a rate of 13% of the amount of metakaolin. To determine the mechanical properties of the produced geopolymer mortars, compressive strength, flexural strength, splitting strength, porosity, ultrasonic pulse velocity (UPV), and abrasion tests were performed. Also, SEM and XRD analyses were performed to examine the microstructures of the specimens. The satisfactory results obtained proved that all four types of filler materials can be used in metakaolin-based geopolymer mortars. Optimum rates for limestone powder, basalt powder, waste marble powder, and recycled aggregate powder were obtained as 50%, 50%, 25%, and 25%, respectively.