Dataset Information


Alkalinity and Its Consequences for the Performance of Steel-Reinforced Geopolymer Materials.

ABSTRACT: This paper investigates the development of the alkalinity and its impact on carbon steel reinforcement embedded in alkali-activated fly ashes (AAFA) and alkali-activated fly ashes with ten percentage mass (wt%) of blast furnace slag (AAFAS)-based materials (geopolymer-GP). The pH analysis of eluates indicates a remarkable decrease of alkalinity in AAFA and AAFAS in the first hours of the geopolymerization process. Phenolphthalein solution and pore solution tests on concretes also show a sharp decrease of alkalinity with increased Ca content in the binder due to carbonation. Micro X-ray computer tomography (µXCT) and electrochemical techniques indicate that the changed pH in the GP systems was accompanied by a decrease in the corrosion rates of steel reinforcement when compared to ordinary Portland cement (OPC) systems. In contrast to calcite and vaterite, which were detected in OPC and AAFAS after a carbonation process, only sodium carbonate natron was determined at lower levels in AAFA by X-ray diffraction (XRD).


PROVIDER: S-EPMC7287886 | BioStudies | 2020-01-01

SECONDARY ACCESSION(S): 10.1617/s11527-014-0268-9

REPOSITORIES: biostudies

Similar Datasets

2016-01-01 | S-EPMC5456877 | BioStudies
2013-01-01 | S-EPMC5458935 | BioStudies
2020-01-01 | S-EPMC7435788 | BioStudies
2019-01-01 | S-EPMC6797113 | BioStudies
2020-01-01 | S-EPMC7084247 | BioStudies
2015-01-01 | S-EPMC5455277 | BioStudies
2014-01-01 | S-EPMC5453367 | BioStudies
2015-01-01 | S-EPMC5458908 | BioStudies
2016-01-01 | S-EPMC5457224 | BioStudies
2016-01-01 | S-EPMC5503083 | BioStudies