Addition of cement to lime-based mortars: Effect on pore structure and vapor transport
Addition of cement to lime-based mortars: Effect on pore structure and vapor transport
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DOI：
10.1016/j.cemconres.2004.10.041
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发表时间：
2006-09-01
影响因子：
11.4
通讯作者：
Ruiz-Herrera, E.
中科院分区：
文献类型：
--
作者：
Mosquera, M. J.;Silva, B.;Ruiz-Herrera, E.
这项工作的主要重点是确定水泥添加的影响，这是许多修复中常见的做法，对石灰基砂浆的孔隙结构。第二个目标是建立微观结构与砂浆中水蒸气传输之间的相关性，这是建筑衰变的一个关键特征。为了达到这些目标，我们准备了一套由逐渐增加水泥含量的空气硬化石灰组成的砂浆，以及一套含有水力石灰的砂浆。研究人员使用了几种不同的技术来研究孔隙结构，其中最著名的是汞侵入孔隙法和后向散射模式的扫描电子显微镜。结果表明，随着水泥掺量的增加，孔隙度和孔径逐渐减小。此外，孔隙半径参数与蒸汽扩散系数之间具有良好的相关性。水工石灰砂浆的结构参数和扩散系数介于不同石灰/水泥混合料之间。(C) 2005 Elsevier Ltd版权所有。
The main focus of this work is to determine the effect of cement addition, a common practice in many restorations, on the pore structure of lime-based mortars. A second target is to establish correlations between microstructure and water vapor transport across the mortar, which is a key characteristic of building decay. In order to achieve these objectives, we prepared a set of mortars consisting of air-hardening lime with a progressively increasing cement content, as well as a mortar containing hydraulic lime. Several different techniques, most notably mercury intrusion porosimetry and scanning electron microscopy in the backscatter mode, were used to investigate the pore structure. The results from these procedures led to the conclusion that porosity and pore size are progressively reduced as cement content increases. Moreover, an excellent correlation between pore radius parameter and the vapor diffusion coefficient was established. Hydraulic lime mortar exhibited textural parameters and diffusivity values halfway between those of the different lime/cement mixes studied. (C) 2005 Elsevier Ltd. All rights reserved.