Abstract:

The use of recycled aggregate obtained from construction waste has a very important place instead of the natural aggregate used at high rates in the production of building materials. While the recycling of Portland cement-based materials as recycled aggregates has been widely investigated, the reuse of geopolymers has not been sufficiently focused. Within the scope of this study, it is aimed to reuse the waste states of geopolymer composites, which were produced by disabling the use of cement. 12 different cement-based mortar mixtures were produced by using recycled geopolymer aggregates (RA) in 3 different ratios as 0%, 50% and 100% and basalt fiber at 0%, 0.2%, 0.4% and 0.6% ratios. It was aimed to determine the fresh properties of the produced mortar mixtures by spreading diameter and unit weight tests, and to determine the hardened properties by compressive strength, flexural strength, water absorption and capillary water absorption tests. While the recycled geopolymer aggregate decreased the unit weight values, it caused a significant increase in the water absorption values. The use of basalt fiber above 0.4% for all blends caused a decrease in compressive strength values. The highest compressive strength value was obtained for the 0.2% basalt fiber content in the sample without recycled aggregate replacement. While the flexural strength values of the control mixtures increased depending on the increase in the fiber content, the highest flexural strength value was reached with the basalt fiber ratio of 0.2% for the mortars containing RA.

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