TY - JOUR AU - Sánchez, R. AU - Palacios, M. AU - Puertas, F. PY - 2011/06/30 Y2 - 2024/03/28 TI - Characteristics and propierties of oil-well cements additioned with blast furnace slag JF - Materiales de Construcción JA - Mater. constr. VL - 61 IS - 302 SE - Research Articles DO - 10.3989/mc.2010.54110 UR - https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/565 SP - 185-211 AB - The present paper addresses the alkali activation of Portland cements containing blast furnace slag (20 and 30% of the cement by weight) with a view to the possible use of these materials in oil well construction. The hydration studies conducted showed that in cement/slag blends, the sodium silicate activating solution partially inhibited the dissolution of the silicate phases in the Portland cement, retarding cement hydration and reducing the precipitation of reaction products. Due to such partial inhibition, the cement/slag blends had significantly lower mechanical strength than Portland cements hydrated with water. <sup>29</sup>Si and <sup>27</sup>Al MAS NMR and BSE/EDX studies, in turn, showed that the C-S-H gel forming in the alkali-activated cement/slag pastes contained Al in tetrahedral positions and low Ca/Si ratios. ER -