A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Durability estimation of porous building stones from pore structure and strength
Weathering agents may cause a rapid change in the initial petrophysical properties of rocks, and thus limit their durability. The influence of both pore structure and strength on the estimation of stone durability was evaluated. Salt crystallisation may limit the durability of porous building stones because it can be considered as one of the most powerful weathering agents. Salt crystallisation produces stress over the pore surface. Consequently, stone durability is closely related to both pore structure and strength, which is the material resistance to crystallisation pressure. We propose a novel petrophysical durability estimator (PDE) as the ratio between parameters and estimators, which are based on pore structure and the strength of the material. Stone parameters and estimators that have an influence on durability and depend only upon pore structure, i.e., connected porosity, water absorption, the water absorption coefficient, specific surface area (SSA), the saturation and adjusted microporosity were used. Stone parameters and estimators with an influence on strength: flexural strength, uniaxial compressive strength, Young's dynamic modulus and compressional wave velocity were included. These parameters and estimators, and the proposed petrophysical estimator are compared with a salt weathering test. The results shows that there is a very strong correlation depend on pore structure and strength. It is concluded that the proposed estimator contains the information necessary to understand and estimate the durability of porous materials which have an impact on buildings, civil constructions and historical monuments.
Durability estimation of porous building stones from pore structure and strength
Weathering agents may cause a rapid change in the initial petrophysical properties of rocks, and thus limit their durability. The influence of both pore structure and strength on the estimation of stone durability was evaluated. Salt crystallisation may limit the durability of porous building stones because it can be considered as one of the most powerful weathering agents. Salt crystallisation produces stress over the pore surface. Consequently, stone durability is closely related to both pore structure and strength, which is the material resistance to crystallisation pressure. We propose a novel petrophysical durability estimator (PDE) as the ratio between parameters and estimators, which are based on pore structure and the strength of the material. Stone parameters and estimators that have an influence on durability and depend only upon pore structure, i.e., connected porosity, water absorption, the water absorption coefficient, specific surface area (SSA), the saturation and adjusted microporosity were used. Stone parameters and estimators with an influence on strength: flexural strength, uniaxial compressive strength, Young's dynamic modulus and compressional wave velocity were included. These parameters and estimators, and the proposed petrophysical estimator are compared with a salt weathering test. The results shows that there is a very strong correlation depend on pore structure and strength. It is concluded that the proposed estimator contains the information necessary to understand and estimate the durability of porous materials which have an impact on buildings, civil constructions and historical monuments.
Durability estimation of porous building stones from pore structure and strength
Einschätzung der Beständigkeit poröser Bausteine anhand der Porenstruktur und der Festigkeit
Benavente, D. (author) / Garcia del Cura, M.A. (author) / Fort, R. (author) / Ordonez, S. (author)
Engineering Geology ; 74 ; 113-127
2004
15 Seiten, 2 Bilder, 6 Tabellen, 46 Quellen
Article (Journal)
English
Durability estimation of porous building stones from pore structure and strength
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