POZZOLANICITY ASSESSMENT OF SUDANESE GROUNDNUT SHELL ASH
Keywords:Blended cements, Groundnut Shell Ash, pozzolanicity, strength activity index
This paper focused on the evaluation of the Pozzolanic characteristics of the Sudanese Groundnut Shell Ash (GSA).
The study investigated the chemical, physical, and mineralogical characteristics of the GSA and its reactivity toward lime and cement, in addition, the compressive strengths of blended mortar containing GSA in percentage addition were tested at 7, 28, and 91 days. XRD technique was used to achieve an optimal calcining temperature for the shell. The results of the chemical analysis showed that the sum of Silica, Alumina, and Iron oxide was 83.75%. The strength reactivity with lime was 3.7MPa, against 4 MPa required by ASTM C-618 and IS: 1344. The strength activity index was found to be 73% against 75% and 80% required by ASTM C-618 and IS: 1344, respectively. These results indicated that the GSA possesses low Pozzolanic activity and the optimum pyroprocessing temperature is 650 0C with heating time 2 hours , and the recommended substitution level is 15%