Water vapour sorption in twelve mineral and bio-based building materials measured by the Dynamic Dewpoint Isotherm (DDI) method

IF 3.9 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2025-06-20 DOI:10.1617/s11527-024-02500-0

Kirstine Meyer Frandsen, Yovko Ivanov Antonov, Per Møldrup, Rasmus Lund Jensen

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引用次数: 0

Abstract

Water vapour sorption is essential to understand the hygric behaviour of building materials. This study introduces an experimental method for quantifying vapour sorption dynamics. We applied the automated, non‑equilibrium Dynamic Dewpoint Isotherm (DDI) method to generate detailed ad- and desorption isotherms for 12 building materials. An overall sorption response surface (SRS; moisture storage as function of water activity or relative humidity) was generated for each material by completing a cyclic run of 14 ad- and desorption isotherms. DDI-measured moisture storage capacity at apparent equilibrium agreed well with an equilibrium method. The wideness (magnitude of hysteresis) and shape (surface and pore-network controlled) of the SRS varied greatly in regard to material composition, porosity, and density. This was used to group the materials in regard to level of moisture dynamics with high-porosity and bio-based materials showing the highest level of sorption dynamics. The DDI-SRS concept seems useful to illustrate and quantify dynamic moisture storage behaviour of building materials and elements under changing relative humidity.

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用动态露点等温线（DDI）方法测量12种矿物和生物基建筑材料的水蒸气吸附

水蒸气吸附对于理解建筑材料的水力学行为是必不可少的。本文介绍了一种定量测定蒸汽吸附动力学的实验方法。我们应用自动化的非平衡动态露点等温线（DDI）方法生成了12种建筑材料的详细吸附和解吸等温线。通过完成14条吸附和解吸等温线的循环运行，生成了每种材料的总体吸附响应面（SRS；水分储存作为水活度或相对湿度的函数）。在表观平衡状态下，ddi测得的蓄湿量与平衡方法吻合较好。SRS的宽度（迟滞幅度）和形状（表面和孔网控制）在材料组成、孔隙率和密度方面变化很大。这是用来分组材料的水分动态水平与高孔隙率和生物基材料显示最高水平的吸附动力学。DDI-SRS概念似乎有助于说明和量化建筑材料和构件在相对湿度变化下的动态水分储存行为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.