Microstructure and hardened state properties on pozzolan-containing concrete
authors Paiva, H; Silva, AS; Velosa, A; Cachim, P; Ferreira, VM
nationality International
journal CONSTRUCTION AND BUILDING MATERIALS
author keywords Concrete; Metakaolin; Diatomite; Microstructure; SEM/EDS; Porosity; Reactivity; Admixtures
keywords INTERFACIAL TRANSITION ZONE; DIATOMITE; HYDRATION; CEMENT
abstract The homogeneous state of the concrete in the fresh state has consequences on their properties in the hardened state. The use of pozzolanic concrete must be carefully evaluated, because the physical and chemical differences of each pozzolan have consequences on concrete hardened state properties. In this work, two physical and chemically different pozzolans were used to evaluate the effect on concrete microstructure and its basic hardened state properties. Scanning electron microscopy (SEM) was used and can be an effective tool in the analysis of the microstructure allowing a better understanding of the properties of concrete in hardened state. It allows showing that the differences in the two pozzolans (metakaolin and diatomite) promote different microstructures as well as different final properties of pozzolanic concrete. Moreover, it was also shown that the use of a water reducing agent, to adjust workability instead of water, promotes an improvement in both the microstructure and the hardened state features such as porosity and mechanical strength. (C) 2017 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0950-0618
isbn 1879-0526
year published 2017
volume 140
beginning page 374
ending page 384
digital object identifier (doi) 10.1016/j.conbuildmat.2017.02.120
web of science category Construction & Building Technology; Engineering, Civil; Materials Science, Multidisciplinary
subject category Construction & Building Technology; Engineering; Materials Science
unique article identifier WOS:000398752200040
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journal analysis (jcr 2017):
journal impact factor 3.485
5 year journal impact factor 4.039
category normalized journal impact factor percentile 83.796
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