An investigation of alkali-activated slag pastes containing recycled glass powder under the effect of elevated temperatures

Studying the Effect of High Temperature on the Content of Glass and Brick Waste Binders after Alkaline Activation

“…The GWP represents a difference in porosity at each temperature, and the highest value was at 800℃ (reaching to 31.3% compared with BWP was arrived to 37.6% in the same temperature). Rashad and al, explained this result that the amount of glass increased as the percentage of water absorption increased [13]. For the BWP gave close results with each other in the chosen thermal range between 100℃ and up 800℃ in values ranged between 35.8% and 37.6%, this is due to the presence of stability in density and a decrease in weight loss.…”

“…TG-DSC analysis of BWP samplesFigure13presents the TG-DSC curves of the GWP sample, the high value of weight loss was cleared before 100℃ at 93.41℃. Rashad and al, was confirmed in your studied about the geopolymers based by glass mixed with slag and exposed at high temperature, was indicated A large weight loss below 200℃ for glass sample without additions[13]. Rashad and al, also explain in other research, this weight loss could be caused to the free water evaporation and the dehydration of C-S-H (I) gel[14].Figure14shows the TG-DSC curves of the GBWP sample, the major value of temperature which indicate by thermal analysis for measured the weight loss it's at 93.3℃ and…”

“…On other hand, for geopolymers when cured at 20℃ and exposed to higher temperature at 600℃ showed a superficial minimum at range of 700℃ which reported decomposition of calcium carbonate [50][51][52][53][54]. [13]. Rashad and al, also explain in other research, this weight loss could be caused to the free water evaporation and the dehydration of C-S-H (I) gel [14].…”

“…The geopolymer mixture must be designed to apply appropriate curing conditions with the selected alkaline activators [11,12]. In other hand, for glass waste can be recycled and included into geopolymers in various ways such as an aggregate, part of activator, part of precursor, or as a source initiation material [13,14].…”

“…In the previous researches, Torres-Carrasco and al, used the slag with glass waste (size < 45 µm) mixed with three different activators NaOH, Na2CO3 and Na2SiO3 [15]. The most results demonstrated that samples activated with Na2SiO3 presented the best compressive strength between 1-28 days in ambient temperature [13]. There is also another parameter that controls the role of the material after it is entered into a mixture, which is the specific surface or fineness [16,17].…”