Evaluation of Performances of Calcined Laterite and Oyster Shell Powder Based Blended Geopolymer Binders

This work consisted in characterizing of calcined laterite and oyster shell powder based blended geopolymer binders. To do this, raw taken from Soa the city Yaoundé shells extracted Mouanko Sanaga-Maritime were initially air-dried, then dried at 105 °C, before being 500 °C 200 respectively for 2 hours. These samples subjected to preliminary studies, i.e. determination their chemical mineralogical compositions, particle size distributions, densities, as well thermal analysis synthesis X-ray diffractometry, gravimetric carried out on laterite, order elucidate time degree calcination two samples, evolution linear shrinkage, setting compressive flexural strengths The results obtained show that are rich CaCO3 contain crystalline phases, while is silica, iron (FeCO3) alumina (Al2O3). samples: Lat + 0% have a between 125 168 min strength about 47 MPa. peak observed around 15% addition powder, 53.5 MPa 28 days with an increased time. was decreased 25 % shells, despite increase It appears this study increases geopolymer, but also leads considerable decrease absorption rate. Above rate, decreases drastically concomitantly increases.