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Progetto Prisma 07Miglioramento dele prestazioni di materiali cementizi capaci di ridurre la concentrazione di gas serraRelazione sul 2° anno di attivitàUnità di Ricerca: Università Politecnica delle Marche
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Oxygen diffusion through hydrophobic cement-based materials
No full textThe oxygen diffusion coefficient through hydrophobic cement-based materials fully immersed in water was
determined by potentiostatic measurements on concrete and by the use of a diffusion cell on cement pastes
and mortars. The obtained results show that very high oxygen diffusion occurs through cement paste, mortar
and concrete made with hydrophobic admixture as opposed to negligible diffusion through the reference
cement matrix without admixture. Moreover, the oxygen diffusion coefficients measured through
hydrophobic cement matrices immersed in water were comparable with those reported in literature for
unsaturated cement materials in air. These experimental results appear to confirm that oxygen dissolved in
water directly diffuses as a gaseous phase through the empty pores of a hydrophobic cement matrix. This
could explain the severe corrosion of steel reinforcement embedded in cracked hydrophobic concrete
immersed in an aqueous chloride solution observed in a previous work
Effect of low dosages of waste GRP dust on fresh and hardened properties of mortars: Part 2
No full textPart 1 of the work reported that by replacing 5–10% of sand volume with GRP dust, workability, autogeneous
shrinkage, deformability and total porosity, though with a smaller average radius, of mortars
increased, thereby reducing significantly the mechanical performance, when wet curing conditions are
adopted. However, the risk of cracking induced by restrained shrinkage and the capillary water absorption
is lower in the presence of GRP dust, leading to enhanced durability of GRP mortars when used as
supporting role. Therefore, in the present work, plaster mortars manufactured by replacing 0–2.5–5%
of sand volume with GRP dust were characterized. For comparison, the addition of an hydrophobic
admixture at different dosages was also considered. Permeability is not significantly reduced by the
low addition of GRP dust, but it is slightly increased by silane addition. Thermal insulation properties,
capillary water absorption and resistance to efflorescence are better with waste GRP dust addition, especially
when combined with silane
Applicazione delle tecniche di monitoraggio alle strutture in calcestruzzo armato
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Miglioramento delle prestazioni di materiali cementizi capaci di ridurre la concentrazione di gas serra
No full textProject Coordinator: Francesca Tittarelli - UdR Università Politecnica delle Marche, Local Coordinator: Luca Bertolini - UdR Milano Politecnic
Effectiveness of flexible polymer-cement coatings and hydrophobic admixtures against corrosion of steel in reinforced concrete
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Durability of cementitious products made with blended cements based on GRP industrial waste
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