TY - JOUR AU - Rashad, Alaa M. PY - 2020/04/30 Y2 - 2024/03/29 TI - An investigation on alkali-activated slag pastes containing quartz powder subjected to elevated temperatures JF - Revista de la Construcción. Journal of Construction JA - RDLC VL - 19 IS - 1 SE - Articles DO - 10.7764/RDLC.19.1.42-51 UR - https://ojs.uc.cl/index.php/RDLC/article/view/12304 SP - 42-51 AB - <p>In this work, the opportunity of employing crystalline silica in the form of quartz powder (QP) to increase the fire resistance of alkali-activated slag (AAS) has been explored. The ground granulated blast-furnace slag (designated as slag) was partially replaced with QP at levels changed from 5% to 30% with a step of 5%, by weight. After curing for 28 days, the specimens were subjected to elevated temperatures varying from 400 <sup>o</sup>C to 1000 <sup>o</sup>C with a step of 200 <sup>o</sup>C for 2 h. The compressive strength before and after heating was measured. The new formed phases were evaluated by using X-ray diffraction (XRD), whilst the decomposition phases were evaluated by using thermogravimetric (TGA). The changes in the microstructures were monitored by using scanning electron microscopy (SEM). The results showed a positive effect of incorporation of QP, up to 30%, in AAS system before and after exposure to elevated temperatures.</p><p>&nbsp;</p><p><strong>&nbsp;</strong></p> ER -