TY - JOUR ID - 157263 TI - Effect of Silica Fume with Hydrated Lime on Compressive Strength and Carbonation Rate of C25 Concrete JO - Advance Researches in Civil Engineering JA - ARCE LA - en SN - AU - Baharavar, Seyedrahim AU - Sheykh, Belgeis AD - Assistant Professor, Department of Civil Engineering, Shams Gonbad University AD - M. Sc. Of Structural Engineering, Department of Civil Engineering, Faculty of Engineering, Gonbad Kavous, Iran Y1 - 2022 PY - 2022 VL - 4 IS - 2 SP - 1 EP - 9 KW - Fly ash KW - Calcium oxide KW - Compression strength test KW - Ultra sound test KW - Pozzolan DO - 10.30469/arce.2022.157263 N2 - In this study 11 different combinations of micro fly ash and calcium oxide were replaced instead of cement. Fly ash with 5%, 10%, 15% and 20% of cement and calcium oxide with 5%, 10%, 15% and 20% of cement and then a combination with fixed 15% fly ash and 5%, 10% and 15% of calcium oxide are replaced instead of cement. Then 108 sample of cubic concrete have been prepared and samples at the ages of 7, 28 and 56 days were applied compression strength and ultra sound tests and results were recorded and compared. According to the results, the samples had the best results at 56 days. The reason for the good results at 56 days was the entry of pozzolan into the system and its reaction with calcium hydroxide resulting from the hydration reaction. UR - https://www.arce.ir/article_157263.html L1 - https://www.arce.ir/article_157263_82d2d7cc4e73d195b10160ecd3097c40.pdf ER -