The evaluation of the in situ mortar properties of old masonry is a very complicated task. Moreover, the properties of the masonry can be rarely inferred by the test of a triplet specimen extracted from a wall, mainly for lack of viable sampling points. A viable alternative is based on the use of brick cores including a central mortar layer lying on a diametrical plane. In fact these specimens can be extracted very easily by cutting cores spanning two bricks at least. The obtained core is then subjected to a splitting test with a set up providing a 45° inclination of the mortar layer with respect to the separation plane. This type of test is similar to a diagonal wallet test and induces a mixed compression – shear stress state in the central mortar layer. By using a Mohr – Coulomb failure criterion the test result can be interpreted in order to obtain all the compression and shear properties of the masonry. In particular, by assuming a friction angle based on the compression to tension strength ratio of the mortar, the cohesion can be evaluated, and in turn, all the other constitutive parameters. In the paper a consistent set of experimental tests is examined which gives experimental evidence that the results of the rotated layer splitting tests are in good agreement with other analytical and experimental procedures.

A. Benedetti, I. Brosio, F. Simonelli (2008). Laboratory assessment of the FRP to timber bonding force for ancient beams showing biological attack. MILANO : Polipress.

Laboratory assessment of the FRP to timber bonding force for ancient beams showing biological attack

BENEDETTI, ANDREA;
2008

Abstract

The evaluation of the in situ mortar properties of old masonry is a very complicated task. Moreover, the properties of the masonry can be rarely inferred by the test of a triplet specimen extracted from a wall, mainly for lack of viable sampling points. A viable alternative is based on the use of brick cores including a central mortar layer lying on a diametrical plane. In fact these specimens can be extracted very easily by cutting cores spanning two bricks at least. The obtained core is then subjected to a splitting test with a set up providing a 45° inclination of the mortar layer with respect to the separation plane. This type of test is similar to a diagonal wallet test and induces a mixed compression – shear stress state in the central mortar layer. By using a Mohr – Coulomb failure criterion the test result can be interpreted in order to obtain all the compression and shear properties of the masonry. In particular, by assuming a friction angle based on the compression to tension strength ratio of the mortar, the cohesion can be evaluated, and in turn, all the other constitutive parameters. In the paper a consistent set of experimental tests is examined which gives experimental evidence that the results of the rotated layer splitting tests are in good agreement with other analytical and experimental procedures.
2008
First International RILEM Symposium SACoMaTiS 2008
1091
1101
A. Benedetti, I. Brosio, F. Simonelli (2008). Laboratory assessment of the FRP to timber bonding force for ancient beams showing biological attack. MILANO : Polipress.
A. Benedetti; I. Brosio; F. Simonelli
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/75579
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