Efficiency of Portland-pozzolana cements: Water demand, chemical reactivity and environmental impact

Author(s)

Abrao, Pedro Cesar R. A. ^{[1, 2]} ; Cardoso, Fabio A. ^{[1, 2]} ; John, Vanderley M. ^{[1, 2]}

Affiliation

^[1] Univ Sao Paulo, Dept Construct Engn, Escola Politecn, BR-05508070 Sao Paulo - Brazil

^[2] Natl Inst Adv Ecoefficient Cement Based Technol, Sao Paulo - Brazil

• Document type: Journal article
• Source: CONSTRUCTION AND BUILDING MATERIALS; v. 247, JUN 30 2020.
• Web of Science Citations: 0

Abstract

One main strategy to reduce CO2 emissions of cement industry is clinker replacement by SCMs. However, the addition of SCMs affects chemical reactivity and water demand of blended compositions, influencing mechanical and environmental performances of cementitious products. This work evaluates the efficiency of an OPC and six Portland-pozzolana cements. The combined water fraction (chemically combined/mixing water), cwf, is proposed as a binder efficiency index which presented a strong correlation with mechanical strength of mortars. Additionally, the study indicates that the environmental impact of mortars (carbon intensity) is not only related to CO2 footprint of cement, but also with cwf index. (C) 2020 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 14/50948-3 - INCT 2014: advanced eco-efficient technologies in cementitious products
• Grantee: Vanderley Moacyr John
• Support Opportunities: Research Projects - Thematic Grants