Advanced search
Start date
Betweenand

Methodology for evaluating the eco-efficiency of cements, considering chemical reactivity and water demand

Grant number: 19/13150-7
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): October 01, 2019
Effective date (End): April 30, 2023
Field of knowledge:Engineering - Civil Engineering - Construction Industry
Principal Investigator:Vanderley Moacyr John
Grantee:Pedro Cesar Rodrigues Alves Abrão
Home Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:14/50948-3 - INCT 2014: advanced eco-efficient technologies in cementitious products, AP.TEM

Abstract

The clinker substitution by Supplementary Cementitious Materials (SCMs) reduces the CO2 footprint of cement in its production, this is the main strategy to reduce the environmental impacts attributed to the cement industry. However, cement is only the raw material, and it is essential to evaluate the environmental impact of the final products (mortar, concrete, precast, etc.) and to associate these impacts to their performance. Currently the cements are classified as to their compressive strength through a fixed methodology (water/cement ratio 0.48) that does not take into account the characteristics of the material and consequently its efficiency in use. The efficiency of the binder in its use will depend on two main parameters, chemical reactivity and water demand, both were related in the combined water fraction indicator (cwf). The substitution of the clinker by SCMs will influence the chemical reactivity and water demand of the composite cement and consequently the performance of the final product as to the rheological behavior, mechanical properties and environmental impact. In this context, the objective of this work is to develop and optimize a methodology to evaluate the eco-efficiency of cements that consider water demand and chemical reactivity, facilitating the development of cementitious materials with low environmental impact. (AU)