Hygrothermal behavior of ultra-lightweight polystyrene concrete

Abstract

The aim of the paper is to investigate the hygrothermal properties of a newly developed ultra-lightweight polystyrene concrete, based on laboratory measurements. It describes the measuring process of thermal conductivities, and determines the declared thermal conductivity. The temperature and moisture conversion coefficients are determined, and new approximate functions are introduced. The paper describes the sorption and desorption isotherms, and gives polynomial approximate functions. The paper also investigates the temperature dependency of sorption curves. It determines the water absorption coefficient and the free water saturation. Furthermore, it describes the measuring process of the water vapor permeability. The water vapor resistance factor and water vapor diffusion-equivalent air layer thickness are calculated.

Durability Properties of Ultra-High Performance Lightweight Concrete (UHPLC) with Expanded Glass

“…In order to consolidate the results of the investigations, other compositions of the UHPLC material must be investigated with regard to durability. In addition, data on thermal performance, like thermal conductivity or thermal diffusivity as well as hydrothermal performance [ 34 ], are needed. Another point is that the influence of the combination of UHPC matrix and lightweight aggregate on the fracture behavior and other mechanical properties, such as splitting tensile strength and fatigue tests, should be examined in regard to the influence of the combination of UHPC matrix and lightweight aggregate.…”

The influence of climatic conditions on the thermal state of frame partitions insulated with loose fiber materials

“…A study of hygrothermal parameters of wood and wood-based products, but gypsum wallboards as well showed linear behaviour for temperatures between 10°C and 40°C while in the higher temperature range the tendency is not linear [7,8]. The general tendency of light materials, especially thermal insulations [9] is to decrease the thermal conductivity with lowering the ambient temperature. It should be noted, that heat conduction through gas is dominant in light insulating materials, and this decreases with the decrease in temperature.…”

Hygrothermal simulations and In-situ measurements of ultra-lightweight concrete panels

“…The material properties of ultra-lightweight concrete (the moisture and temperature dependent thermal conductivity, water vapor permeability and vapor resistance factor, water absorption coefficient, moisture storage function) were determined in a previous research [2].…”

“…The investigated ultra-lightweight building construction is a composite system of a newly developed Expanded PolyStyrene (EPS) concrete and thin-walled steel loadbearing elements. This structure can be a substitute of steel frame houses [1], since polystyrene concrete has a good thermal insulating capability [2], and it is able to restrain the global and distortional buckling modes of steel elements [3], [4]. However, there was research of load-bearing ultra-lightweight concrete as well, that also performs as thermal insulation [5].…”