Journal ArticleDOI
Supersulfated cements based on pumice with quicklime, anhydrite and hemihydrate: Characterization and environmental impact
K. Cabrera-Luna,Erick Maldonado-Bandala,Demetrio Nieves-Mendoza,P. Castro-Borges,P. Perez-Cortes,J.I. Escalante García +5 more
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In this paper, the authors investigated the mechanisms of reaction, microstructure, hydration products, compressive strength and environmental impact of supersulfated cements based on pumice.Abstract:
This investigation reports on the mechanisms of reaction, microstructure, hydration products, compressive strength and environmental impact of supersulfated cements based on pumice (SSC-PM), using 10–20%wt of quicklime (CaO) as the alkaline activator and 5–15%wt of sulfatic activators of anhydrite or hemihydrate; three different initial curing temperature (ICT) regimes were used for 24 h, of 20, 40 and 60 °C. The main hydration products were C–S–H and ettringite; minor phases included monosulfate, gypsum, portlandite and calcite. The ICT of 60 °C accelerated the reactions of formation of ettringite and C–S–H, improving the early strength, whereas; the higher contents CaO (20%) and An or HH (15%) slowed the hydration reactions and consequently the early strength development. The activation with CaO-Anhydrite densified the microstructure leading to 360-day strengths of up to 34 MPa. These SSC-PM represent a good sustainable alternative as these showed emissions of 159–281 kgCO2-eq/t, which are at least 67% lower than the manufacture of clinker of Portland cement.read more
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A Binder Prepared by Low-Reactivity Blast Furnace Slags for Cemented Paste Backfill: Influence of Super-Fine Fly Ash and Chemical Additives
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Recycling of arsenic-containing biohydrometallurgy waste to produce a binder for cemented paste backfill: Mix proportion optimization
TL;DR: In this article , the binder reaction kinetics were determined by the mix proportions, and more arsenic addition decreased the reaction rate according to the Krstulovic-Dabic model.
Journal ArticleDOI
Treatment technologies for olive mill wastewater with impacts on plants.
TL;DR: There are various approaches for removing impurities and the treatment of OMW including chemical, biological, thermal, physiochemical, and biophysical processes as mentioned in this paper , which can positively affect plants' development when it's applied to the soil after pretreatment and treatment processes due to its high mineral contents and organic matter.
Journal ArticleDOI
Hydration Mechanisms and Mechanical Properties of Pumice Substituted Cementitious Binder
Yilmaz Kocak,İbrahim Pinarci +1 more
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Recycling of arsenic-containing biohydrometallurgy waste to produce a binder for cemented paste backfill: Influence of additives
TL;DR: In this paper , the reaction kinetics of binder modified by additives were studied via isothermal calorimeter test; mechanical strength and hydration products modifications due to the addition of additives were also explored.
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Journal ArticleDOI
Industrially interesting approaches to “low-CO2” cements ☆
TL;DR: In this paper, the authors discuss the practicality of replacing portland cements with alternative hydraulic cements that could result in lower total CO 2 emissions per unit volume of concrete of equivalent performance.
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Advances in alternative cementitious binders
TL;DR: In this paper, four promising alternative binders available as alternatives to Portland cement are discussed, namely calcium aluminate cement, calcium sulfoaluminate cements, alkali-activated binders, and supersulfated cements.
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Influence of limestone on the hydration of Portland cements
TL;DR: In this paper, the influence of the presence of limestone on the hydration of Portland cement was investigated, and it was shown that the stabilisation of monocarbonate in the absence of limestone indirectly stabilised ettringite, leading to a corresponding increase of the total volume of the hydrate phase and a decrease of porosity.
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Carbonation of CH and C-S-H in Composite Cement Pastes Containing High Amounts of BFS
Paulo H. R. Borges,Juliana O. Costa,Neil B. Milestone,Cyril J. Lynsdale,Roger E. Streatfield +4 more
TL;DR: In this paper, TGA/DTG was used to quantify the amounts of carbonates formed from calcium hydroxide (CH) and calcium silicate hydrate (C-S-H), based on the CH and carbonate contents before and after carbonation.