TY - JOUR TI - Using of thermal power plant fly ash to produce semi-lightweight aggregate and concrete AU - AZEZ ALTAYAWI, O.A. AU - ÖZ, H.Ã. AU - MERMERDAÅž, K. JO - Sigma Journal of Engineering and Natural Sciences PY - 2023 VL - 41 SP - 42 EP - 48 DO - 10.14744/sigma.2023.00005 ER -