TY  - JOUR
T1  - Strength and abrasıon performance of recycled aggregate based geopolymer concrete
AU  - Lakew, Asfaw Mekonnen
AU  - Al-mashhadanı, Mukhallad M.
AU  - Canpolat, Orhan
PY  - 2022
DA  - March
JF  - Sigma Journal of Engineering and Natural Sciences
JO  - SIGMA
PB  - Yildiz Technical University
WT  - DergiPark
SN  - 1304-7191
SP  - 155
EP  - 161
VL  - 40
IS  - 1
LA  - en
AB  - This experimental work evaluated geopolymer concrete containing fly ash and slag by partial replacement of natural coarse aggregate (NCA) with recycled coarse aggregate (RCA) to manufacture environmental-friendly concrete. The proportion of recycled aggregates considered consists of 10%, 20%, 30%, and 40% of the total coarse aggregate amount. Also, a steel fiber ratio of 0.3% was utilized. The mechanical properties and abrasion resistance of fly ash/slag-based geopolymer concrete were then assessed. Majorly, the mechanical strength of the concrete samples decreased by the increase of RCA content. The geopolymer concrete with 40% RCA gave 28.3% lesser compressive strength and 24% lower splitting tensile strength than NCA concrete at one year. Also, the flexural strength of concrete specimens was reduced by 35% (from 5.34MPa to 3.5MPa) with the incorporation of 40% RCA. The incorporation of 30% RCA caused 23% and 22.6% reduction in compressive strength at 56 days and one year, respectively. The flexural and splitting tensile strength of the specimens was not significantly reduced (less than 10%) with the inclusion of a recycled coarse aggregate ratio of up to 30%. Furthermore, the abrasion wear thickness of every concrete sample was less than 1mm. RCA inclusion of 20% produced either insignificant reduction or better strength results compared to reference mixtures. As a result, it was considered that the combination of 0.3% steel fiber and 20% recycled coarse aggregate in fly ash/slag-based geopolymer concrete leads to an eco-friendly concrete mix with acceptable short and long-term engineering properties that would lead to sustainability in concrete production and utilization sector.
KW  - Compressive strength
KW  - Splitting tensile strength
KW  - Fexural strength
KW  - Abrasion resistance
KW  - Geopolymer concrete
KW  - Recycled aggregate
CR  - The article references can be accessed from the .pdf file.
UR  - https://dergipark.org.tr/en/pub/sigma/issue//1093244
L1  - https://dergipark.org.tr/en/download/article-file/2331948
ER  -