PorousPorous materials that captureCapture carbon dioxide at low concentrations require fast adsorptionAdsorption kinetics and selectivity. GeopolymersGeopolymers can be inserted in this line by adjusting their synthesis configuration, acting as precursorsPrecursor to zeolitesZeolite. Developing a porousPorous part capable of sequestering carbon dioxide (CO2) requires ensuring that the porousPorous distribution remains stable during its processing, i.e. mixing, molding, densification, and hardening. However, it is known that part of its effect is lost in these stages due to the mechanical instability represented by the internal air balls. Likewise, some additivesAdditive are expected to help maintain reasonably sized pores (mesopores), that are stable during the hardening of the material. Therefore, this study aims to evaluate the technical changes caused by mineralMineral oil in alkalineAlkaline activation systems for CO2 captureCapture purposes. Unitary and binary systems consisting of metakaolinMetakaolin, and slag, activated by sodium hydroxide and sodium silicate were evaluated through rotational rheology and mechanical strength. The main variables of the system were the interaction between additivesAdditive under two cure temperatures (23 °C and 50 °C). This evaluation would make it possible to indicate which combinations of additivesAdditive can favor pore stability, as well as, comparatively, which processing conditions can favor or impair pore stability.