Abstract
A clear alternative to reach the goal of sustainable development in the Construction Sector is the development of alternative building materials to Ordinary Portland Cement (OPC) in a more energetically as well as environmentally eco-efficient way. Alkaline cements (Alkali-Activated Materials, AAMs) and geopolymers meet these requirements; and they are based on the alkali activation of aluminosilicates (mainly waste and industrial by-products, such as blast furnace slag, fly ash and ceramic waste) in highly alkaline solutions. AAMs cements and concretes are notable for being very durable and mechanically resistant. However, to date their rheological behaviour is not well controlled and there is little understanding of it, with very disparate experimental data. Despite this, their rheological behaviour is not fully understood and little is known on the disparate data obtained in AAM pastes. Moreover, the common additives used in the preparation of OPC concretes and the rheology modifiers/controllers are also unstable in the AAMs systems.
Highlights
Rheology is the study of the fluidity and deformation of matter
In alkali-activated slag (AAS) cements, the nature of the activator is a key factor in the rheological behaviour of the paste [21]
The workability of AAS and activated fly ashes (AAFA) could be more sensitive than that observed in Ordinary Portland Cement (OPC) mortars
Summary
An understanding of the rheological properties of cement pastes, mortars and concretes is essential to ascertaining their consistency and workability and their ease of casting or placement. Many authors have studied Portland cement paste rheology as a preliminary to determining the rheology of the respective mortars and concretes [2,3,4,5,6,7,8]. Very few studies have been conducted on alkaline activated cement paste, mortar or concrete rheology, .
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