Magnus Åhs- Ph.D
- Lecturer at Lund University
Magnus Åhs
- Ph.D
- Lecturer at Lund University
About
18
Publications
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Introduction
Magnus Åhs currently works at the Division of Building Materials, Lund University. Magnus does research in Civil Engineering. His current project is 'Modeling drying of concrete in COMSOL Multiphysics.'
Current institution
Additional affiliations
April 2004 - present
Publications
Publications (18)
Evaluation of an Embedded Wireless Relative Humidity Probe for Monitoring Concrete Drying
Electricit´e de France (EDF) operates a large fleet of nuclear reactors and is responsible for demonstrating the safety of facilities, including concrete containment buildings (CCB), which are non-replaceable components. The leak-tightness of CCBs is assessed every 10 years during integrated leak-rate tests (IRLT). For double-wall containments, whi...
This research was conducted at the division of Building Materials, LTH from February 2017 until December 2019. The objectives were to establish if self-healing of concrete depends on binder and exposure climate and to what extent this can be determined using a permeability test developed by the author. The binders used in this study were three bind...
This paper presents the moisture dependency of moisture transport and moisture fixation in mortars with OPC, slag and silica fume. Water vapor desorption isotherms were measured with gravimetric methods and the moisture dependency of moisture transport was investigated with cup-tests. The results show an ongoing evolution of water vapor desorption...
Électricité de France S.A. has built a 1/3 scale model of a reactor containment at their facilities outside Paris, equivalent to a French full-scale nuclear power plant reactor model P4. This large mockup enables the research of the aging processes affecting pre-stressed reactor containments. The aim is that after the 7 years of testing under way,...
![Figure 2.1 The moisture dependent moisture transport coefficient v, [2]](profile/Magnus-Ahs/publication/301351529/figure/fig1/AS:352195640872966@1460981392776/The-moisture-dependent-moisture-transport-coefficient-v-2_Q320.jpg)
Moisture has an impact in many of the degradation mechanisms that appear in the structures of a nuclear power plant. Moisture conditions in a reactor containment wall have been simulated by using a hygrothermal model of drying concrete. Methods to estimate the temperature dependency of the sorption isotherms and moisture transport properties is sug...
This study describes a method to obtain a certain humidity level by a certain drying treatment. This treatment was applied on cement based materials in order to identify the critical moisture level above which ion transport can occur. The drying is performed in two steps, first in one direction to reach a certain moisture level and then in the oppo...
A qualitative model of moisture distribution in screeded concrete slabs is presented. From this model it is possible to identify humidity changes in each material and thus determine corresponding moisture properties. The distribution of relative humidity, RH, was determined in nine screeded concrete slabs before flooring and after a certain time of...
Drying of screeded floor slabs is an important issue for the building industry. However, virtually no attention is paid in prediction models to the hysteresis of sorption isotherms, mainly because of lack of data. Disregarding the hysteresis in prediction models will generate inaccurate predictions of future moisture distribution and remaining dryi...
Moisture in a drying concrete slab redistributes subsequent to applying semi-permeable flooring, hence increasing the humidity beneath the flooring. Such a humidity increase may be substantial in terms of relative humidity, RH, even though the redistributed moisture content appears insignificant. This comparably large increase originates from the h...
