Acoustic emission and numerical analysis of the delamination process in repair plasters applied to historical walls
Acoustic emission and numerical analysis of the delamination process in repair plasters applied to historical walls
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DOI：
10.1016/j.conbuildmat.2019.117798
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发表时间：
2020-03-10
影响因子：
7.4
通讯作者：
Valente, Silvio
中科院分区：
文献类型：
--
作者：
Grazzini, Alessandro;Accornero, Federico;Valente, Silvio
湿现象或物理-力学循环应力往往是历史墙体修复中抹灰发生分层的原因。本文提出了一种新的实验方法，即在室内对混合石砂浆试件进行试验，并对其分层过程进行分析。该实验模拟了位于意大利皮埃蒙特的联合国教科文组织遗址——圣蒙特迪瓦拉洛（Sacro Monte di Varallo）石墙中反复出现的分层现象。通过声发射（AE）传感器在试验过程中的监测，可以确定在石膏砂浆和石料之间的界面上发生的分层过程的不同破裂模式。声发射是一种非破坏性技术，可用于估计砂浆与石之间附着面破裂扩展释放的能量。试验结果证实了修复砂浆与砌体石材在分层面内部的摩擦过程具有粘滑特性。(C) 2019 Elsevier Ltd.版权所有。
The delamination process of plasters applied for the repair work of historical walls was often caused by humidity phenomena or physical-mechanical cycles stress. In this paper a new experimental methodology has been conducted by testing in the laboratory mixed stone-mortar specimens and analyzing the delamination progression. The experiment simulated the recurring delamination in the stone walls of the Sacro Monte di Varallo, an UNESCO site in Piedmont (Italy). Through the monitoring by means of acoustic emission (AE) sensors during the tests it was possible to qualify the different fracture modes characterizing the delamination process, which takes place during the tests at the interface between plaster mortar and stone block. AE is a non-destructive technique useful to estimate the amount of energy released from fracture propagation in the adherence surface between mortar and stone. The experimental results confirmed the stick-slip behaviour that characterises the friction process inside the delamination surface between repair mortar and masonry stone. (C) 2019 Elsevier Ltd. All rights reserved.