Pumice-based supersulfated cements in mortars: Effects of pumice fineness and activator ratio on physical and environmental characteristics. (1st August 2022)

• Record Type: Journal Article
• Authors: Cabrera-Luna, Karina; Perez-Cortes, Pedro; Escalante Garcia, J. Ivan
• Is Part Of: Construction & building materials. Volume 342:Part A(2022)
• Publication Date: 2022-08-01
• Subjects: Supersulfated cements -- Life cycle assessment -- Pumice -- C-S-H -- Ettringite; PM Pumice -- SSC-PM Supersulfated cement based on pumice -- An Anhidrite -- PC Portland cement; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2022.127947
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Low emissions supersulfated cements of pumice were evaluated in mortars. Pumice of 3 surface area was activated by CaSO4 and different ratios Ca(OH)2 :Portland cement. Emissions under 184 kgCO2 -eq/m 3 of mortar were 66% lower than mortars with only Portland cement. A binder of 65%pumice-15%anhydrite-10%CaO-10%Portland cement, reached 26–28 MPa. The mortars with pumice of up to 600 m 2 /kg showed adequate dimensional stability. Abstract: This paper presents an investigation on the effects of pumice fineness and alkaline activators ratio on the physical, mechanical and environmental features of pumice-based supersulfated mortars. These were prepared with a water/binder ratio of 0.40 and a binder: aggregate ratio of 1:2.75 and cured at 60 °C for 22 h; then the hardened samples were stored in dry and wet conditions for up to 120 days. The best results were for the composition 10%quicklime-10%Portland cement-15%anhydrite-65%pumice wet cured that had 28 MPa and a maximum expansion ∼ 0.10%. The mortars with the supersulfated cements are a good cleaner alternative for use as a building material having emissions < 184 kgCO 2 -eq/m 3, which are at least 66% lower than Portland cement mortars.