A new probabilistic model for the assessment of mould growth in buildings has been elaborated within interdisciplinary – building physics/structural engineering cooperation. Both occurrences favourable conditions fungi and their durations are taken into account. The approach can be characterised as time dependent based on theory stochastic processes. resulting probability occurrence cycles having deteriorating potential suggests itself a measure hazard. By measure, management performance...

Steady-state thermal conductivity measurements of the cellulose fibre reinforced calcium silicate insulation boards were carried out. After exclusion effects caused by enthalpy flow and possible non-linear moisture content distribution effective conductivity-moisture relations determined from measured apparent values. The achieved dependences have had in first approximation character a bilinear function for all types silicates. material structure-based model capturing essential features...

In this work the effect of salt contamination on moisture transport parameters - water vapor permeability and diffusivity is studied for case ceramic bricks with very low hygroscopic ability. The analysis focused to small concentrations, having practically negligible material porosity but significantly increasing content bricks. simply experiment, consisting in monitoring isothermal one-dimensional capillary uptake following drying was carried out free contaminated Tests were done two...

This work compares two methods, the X-ray method and time domain reflectometry (TDR) method, which are used for determining moisture transport parameters, such as diffusivity, w-λ profile absorption coefficient. Both methods suitable measuring instantaneous content profiles during water transfer through a porous material. However, while is fully non-destructive, TDR measurement requires installation of probes into measured material obtained results can be influenced by quality contact...

Effect of particular material parameters such as moisture dependence diffusivity, retention curve and water vapor permeability on the process wetting capillary-porous building is studied. 1-D uptake was monitored calcium silicate sample 0.1 m height 0.10 × 0.04 base. Detailed measurement time dependent profiles carried out using X-ray method. Numerical simulations were done by simulation tool WUFI in order to evaluate a sensitivity calculated applied diffusivity function, permeability. Apart...

Numerical models of the Heat-Air-Moisture (HAM) transfer need hourly values climatic elements including driving rain loads. This paper presents a method creating data loads on an exposedwall applicable as boundary condition forHAMnumerical calculations. It is suitable in case real are not available. The uses measured daily characteristics elements—the amounts horizontal rainfall and means wind speed. Results numerical simulation hygrothermal performance wall that use approximated courses...

This paper analyses the effect of microstructure, mineralogical composition and possible salt contamination on parameters moisture accumulation transport. Analysis is done for three types contemporary two historical bricks.

The laboratory measurement of water vapour adsorption/desorption curves is a standard tool for determination the moisture capacity porous building materials in hygroscopic region. However, case cementitious materials, additional processes like carbonation can occur during measurement. Generally, process affects pore structure material and results an increase its bulk density. Therefore, correct sorption caused density has to be eliminated. In this work both mentioned effects on measured...

An effect of the presence sodium chloride on water vapour adsorption/desorption loop was quantified for two types commonly used ceramic bricks with different hygroscopic ability. The measurements were carried out salt free materials and saline contaminated solutions concentrations. It found that at relative humidity higher than deliquescence point, hysteretic effects similar or less significant as ones bricks. In this range desorption moisture contents did not exceed values predicted using...

A quantification of the hysteretic effects and their thorough analysis was carried out for three types ceramic bricks. Water vapor adsorption/desorption isotherms were measured by standard desiccator method. The desorption measurements from capillary moisture content as well equilibrium corresponding to relative humidity 98 %. For all tested bricks present but significance differed depending on particular type brick. Significant differences noticed also in curves determined Based data a...

Indoor air relative humidity is an important parameter influencing the hygro-thermal performance of building structures and indoor climate as well. In order to predict resultant in zone for designed surfaces moisture production/ventilation regime suggest possible improvements, a sufficiently accurate dynamic model necessary. The computational codes simulating interaction between interior hygroscopic materials can be divided roughly into two groups: using simple lumped models detailed...