Deterioration of natural hydraulic lime mortars, I: Effects of chemically accelerated leaching on physical and mechanical properties of uncarbonated materials
Deterioration of natural hydraulic lime mortars, I: Effects of chemically accelerated leaching on physical and mechanical properties of uncarbonated materials
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DOI：
10.1016/j.conbuildmat.2014.09.015
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发表时间：
2014-12-15
影响因子：
7.4
通讯作者：
Banfill, Phillip F. G.
中科院分区：
文献类型：
--
作者：
Forster, Alan M.;Szadurski, Ewan M.;Banfill, Phillip F. G.
使用石灰粘结剂的砖石在世界所有地区都很常见。对北方地区未来气候的模型表明，更强烈的降雨将导致用于大规模砖石建筑的材料在更长的时间内饱和，因此粘结剂渗漏和随之而来的变质风险更高。在石灰胶凝材料浸出的首次研究中，使用硝酸铵浸出剂来加速含有天然水硬性石灰胶凝材料的砂浆的劣化。粘结剂的损失降低了砂浆的碱度和强度，增加了其吸水性。浸出深度遵循扩散控制动力学，速率常数随粘结剂中游离氢氧化钙含量的增加而增大。为未碳化砂浆开发了一个预测模型，例如所有年龄段的砂浆(历史或现代)，在大量砖石结构中深度发现的砂浆，以及在新建筑或维修中早期发现的砂浆。(C)2014爱思唯尔有限公司。保留所有权利。
Masonry using lime binders is very common in all regions of the world. Models for the future climate in northern regions suggest more intense rainfall which will result in the materials used in mass masonry being saturated for longer periods and therefore at higher risk of binder leaching and consequent deterioration. In this first study of lime binder leaching, ammonium nitrate leachant was used to accelerate the deterioration of mortars containing natural hydraulic lime binders. Loss of binder reduced the alkalinity and strength of the mortar and increased its sorptivity. The leached depth followed diffusion-controlled kinetics with the rate constant increasing in line with the increasing free calcium hydroxide content of the binder. A predictive model was developed for uncarbonated mortars, such as those of all ages (historic or modern) found deep in mass masonry and those at early age in new construction or repairs. (C) 2014 Elsevier Ltd. All rights reserved.