Wetting front dynamic study in Brazilian cements using neutron and X-ray imaging techniques
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Cement-based materials have a complex porous structure that changes over time, and the durability of such
materials strongly correlates to the transport of water and ions throughout the pore structure. The type of cement
plays an important role on concrete durability. In this study the dynamics of water absorption using three
different types of Portland cement: i) high-early strength cement, ii) ground granulated blast furnace slag
(GGBFS) blended cement, and iii) pulverized fly ash (PFA) blended cement, at two different curing ages (7 days
and 60 days) were investigated. Neutron radiography technique was used for continuous monitoring of the water
absorption in cement paste samples, as shown in the film measured by 3 h, showing the radial and longitudinal
penetration of water. The evolution of the wetting front was quantified, analyzed and it was observed that the
volume of absorbed water presents behavior according to the square root of time based on neutron images for all
samples. X-ray tomography technique was used to investigate the differences between the pore structure and
volume of pores (air voids). Finally, this article shows that image techniques is a suitable method for analyzing
the size, surface and location of single air voids. The combination of the results from X-ray Tomography and
Neutron Radiography shows the potential application of these methods for determining air void parameters and
demonstrates how microstructure, type of cement and curing time modified the dynamic water absorption. As
expect the fastest absorption was observed on the samples cured for 7 days, however results show clear differences
between the three types of cement. At the longer curing time, although no significant differences were
found in water absorption, there were important differences in the total number and volume of air voids.
Como referenciar
ROSENBERGER, HIGOR; BULLA JR, MARCIO A.; GARCEZ, ESTELA O.; KARDJILOV, NIKOLAY; YOKAICHIYA, FABIANO; FRANCO, MARGARETH K.K.D. Wetting front dynamic study in Brazilian cements using neutron and X-ray imaging techniques. Next Materials, v. 8, p. 1-9, 2025. DOI: 10.1016/j.nxmate.2025.100902. Disponível em: https://repositorio.ipen.br/handle/123456789/49367. Acesso em: 04 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.