On the experimental investigation of pozzolanic lime mortar stress-strain behavior and deformation characteristics when subjected to unloading-reloading cycles

A simplified damage evolution relationship and deformation character¬istics of a pozzolanic lime mortar when subjected to unloading-reloading cycles in the pre-peak region

“…he properties and constitution of the pozzolanic mortar used in the experiments previously conducted by the authors are described in detail in [11]. In summary, a mix design of sand, lime and metakaolin (at 50, 30 and 20% w/w, respectively) was developed utilizing a water to binder ratio of 0.92.…”

“…The preparation of specimens has been described in detail in [11]. Previous research by the authors [1] indicated that it is better to develop cylindrical mortar specimens by coring mortar blocks compared to direct casting into cylinders.…”

“…Details on this test are given by Gatelier et al [7]. This investigation further analyzes the results from two series of uniaxial and triaxial compression tests under cyclic loading, which were recently completed by the authors [11]. Future work will aim at experimentally investigating the post-peak region behavior of the material in order to suggest a complete damage evolution law.…”

“…Many uniaxial and triaxial experiments under a loading-unloading-reloading regime (cyclic loading) have been conducted and are reported in the international literature (e.g., test on rocks [7,8] and concrete [9,10]). The authors have also performed such tests on mortars [1,11] and have shown that such specimens predominantly exhibit a plastic behavior. Some of these experiments [11] were focused on examining the stress-strain behavior and deformation characteristics of a pozzolanic lime mortar in the pre-peak region of the stress-strain curve.…”

“…The authors have also performed such tests on mortars [1,11] and have shown that such specimens predominantly exhibit a plastic behavior. Some of these experiments [11] were focused on examining the stress-strain behavior and deformation characteristics of a pozzolanic lime mortar in the pre-peak region of the stress-strain curve. The term "cyclic loading" refers to the loading-unloading-reloading procedure which was utilized to gain a better understanding of the elasto-plastic properties of the material.…”