Impact of Graphite Powder on The Properties and Microstructure of Conventional and Silica Fume Concretes | ||||
| Sinai International Scientific Journal | ||||
| Volume 2, Issue 1, July 2025, Page 59-76 PDF (857.54 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/sisj.2025.442496 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Elsayed K. E. Alabuoky  ; Mohy S. Fattouh
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| Civil Engineering Department, Faculty of Engineering, Sinai University, Arish City, Egypt | ||||
| Abstract | ||||
| Recently, the production of electrically conductive concrete (ECC) has become widespread by using carbon materials such as graphite powder GP. To eliminate the negative impact of using graphite powder (GP) alone as an additive to concrete, one of the supplementary cementitious materials (SCMs), such as silica fume SF, is combined with graphite powder (GP). In this respect, research work was conducted on concrete mixes with a cement replacement with silica fume with an SF ratio of 10% and with cement replacement levels with graphite powder (GP) ratio of 2.5, 5 and 7.5%. A control concrete mix (MCC) was made with 100% cement with no supplementary cementitious or carbon materials. Concrete mixes were tested in rheological properties such as slump and in hardened properties such as compression, indirect tension and flexural. Concrete samples were tested in compression at the ages of 3, 7, 28 and 90 days and were tested in indirect tension and flexural at the ages of 7 and 28 days. The durability of the concrete samples was examined in both the rapid chloride penetrability (RCP) test and the scanning electron microscopy (SEM) test. The compressive strengths of concrete mixes, MSF-GP2.5, MSF-GP5 and MSF-GP7.5 increase by about 11, -0.3 and -7% compared to MCC but were reduced by about 7, 18 and 21% when compared to MSF, respectively at the age of 28 days. Tensile strengths of concrete mixes, MSF- GP2.5, MSF-GP5 and MSF-GP7.5 were increased by about 19, 3 and -10% compared to MCC but, were reduced by about 7, 20 and 29% compared to MSF, respectively, at the age of 28 days. Flexural strengths of concrete mixes MSF- GP2.5, MSF-GP5 and MSF-GP7.5 increase by about 12, -0.3 and -6% when compared to MCC but were reduced by about 7, 17 and 21% when compared to MSF, respectively, at the age of 28 days. Inclusion of graphite powder in silica fume concrete increases the rapid chloride penetration (RCP) and reduces the pozzolanic effect of silica fume on cement matrix. | ||||
| Keywords | ||||
| Graphite; powder; silica; fume; rapid; chloride; microscopy; concrete | ||||
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