Abstract
Blends of Tungsten mining waste mud (TMWM) and brick waste powder (BP) with different dosages were used as precursors for the study of a new binder obtained by alkali-activation. The synthesis was obtained at 60ºC curing during the first 24 hours and at 20°C during the remaining period. A combination of sodium hydroxide (SH) and sodium silicate (SS) solutions was used with SS/SH weight ratio equal 1.5. The solid precursors/liquid activators weight ratio equal to 4. And the modules SiO2/Na2O increase with the increasing of BP dosages 5.21 and 5.59 for dosages 10% and 50%, respectively. Mineralogical characterisation of raw materials was carried out by X–ray diffraction (XRD). The effect of the dosage of BP on the compressive strength and pore size distribution of the new binder was investigated from 24 hours up to 28 days. The pore size distribution was obtained mercury intrusion porosimetry (MIP). The increase in the dosages of BP, between 10 to 50%, was followed by an increase in compressive strength, from 25 to 59 MPa, for all the tested ages. The binder matrix become more dense and compact with the gradually increase of BP dosages, as found out by MIP.
Highlights
The cement manufacturing process is responsible for about 6% of the global CO2 emissions
We evaluated the synthesis of an alkali-activated binder (AAB) obtained by blending Tungsten mine waste mud (TMW) and brick powder (BP), using as activators a mix solution of sodium silicate (SS) and sodium hydroxide (SH)
The materials used in this work are Tungsten mining waste mud (TMWM) and brick waste powder (BP)
Summary
The cement manufacturing process is responsible for about 6% of the global CO2 emissions. In Europe, the activities of mining and quarrying generate approximately 55% of total industrial wastes according to Eurostat [3]. Brick waste powder (BP) is one of the different types of ceramic waste used to develop alkali–activated binders [11]. Studies focused on producing alkali–activated materials based on itself or on the combination of BP with and other minerals; namely, different ceramic waste types [12], [13], BP with concrete waste [14] and BP with GGBFS [15], brick waste powder with fly ash [16], red clay brick waste only [17], [18] and ordinary Portland cement with BP [18]. This research work is part of REMINE research program (H2020 RISE-Marie Curie Action) that aims to develop new ideas for the reuse of mining wastes into innovative alkali-activated-based materials for structures and buildings
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