Thermal inertia of newspaper sandwiched aerated lightweight concrete wall panels: Experimental study

2011 ◽  
Vol 43 (10) ◽  
pp. 2956-2960 ◽  
Author(s):  
Soon-Ching Ng ◽  
Kaw-Sai Low ◽  
Ngee-Heng Tioh
Keyword(s):  
Experimental Study ◽  
Lightweight Concrete ◽  
Thermal Inertia ◽  
Concrete Wall ◽  
Wall Panels

Evaluation of fire performance of lightweight concrete wall panels using finite element analysis

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Irindu Upasiri ◽  
Chaminda Konthesingha ◽  
Anura Nanayakkara ◽  
Keerthan Poologanathan ◽  
Brabha Nagaratnam ◽  
...  
Keyword(s):  
Finite Element ◽  
Lightweight Concrete ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Fire Performance ◽  
Concrete Wall ◽  
Aggregate Concrete ◽  
Content Type ◽  
Wall Panels ◽  
Foamed Concrete

Purpose In this study, the insulation fire ratings of lightweight foamed concrete, autoclaved aerated concrete and lightweight aggregate concrete were investigated using finite element modelling. Design/methodology/approach Lightweight aggregate concrete containing various aggregate types, i.e. expanded slag, pumice, expanded clay and expanded shale were studied under standard fire and hydro–carbon fire situations using validated finite element models. Results were used to derive empirical equations for determining the insulation fire ratings of lightweight concrete wall panels. Findings It was observed that autoclaved aerated concrete and foamed lightweight concrete have better insulation fire ratings compared with lightweight aggregate concrete. Depending on the insulation fire rating requirement of 15%–30% of material saving could be achieved when lightweight aggregate concrete wall panels are replaced with the autoclaved aerated or foamed concrete wall panels. Lightweight aggregate concrete fire performance depends on the type of lightweight aggregate. Lightweight concrete with pumice aggregate showed better fire performance among the normal lightweight aggregate concretes. Material saving of 9%–14% could be obtained when pumice aggregate is used as the lightweight aggregate material. Hydrocarbon fire has shown aggressive effect during the first two hours of fire exposure; hence, wall panels with lesser thickness were adversely affected. Originality/value Finding of this study could be used to determine the optimum lightweight concrete wall type and the optimum thickness requirement of the wall panels for a required application.

BUCKLING OF STEEL FIBRE EXPANDED POLYSTYRENE CONCRETE WALL PANEL

2015 ◽  
Vol 76 (10) ◽  
Author(s):  
Rohana Mamat ◽  
Siti Hawa Hamzah ◽  
Jamilah Abd. Rahim
Keyword(s):  
Steel Fibre ◽  
Lightweight Concrete ◽  
Slenderness Ratio ◽  
Expanded Polystyrene ◽  
Sustained Load ◽  
Wall Panel ◽  
Concrete Wall ◽  
Maximum Displacement ◽  
Load Bearing ◽  
Wall Panels

Steel Fibre Expanded Polystyrene Concrete (SFEPS) wall panel is envisaged as load bearing walls, although it is lightweight by design. The performance of this wall is investigated, incorporating opening to fulfil the demand for ventilation and services conduits or equipments. It focused on the buckling behaviour by comparing the carrying load capacities and deformation profiles of wall panel with and without opening. Primarily, the samples were cast from concrete mixed with expanded polystyrene (EPS) beads, enhanced with hooked end round shaft steel fibre and reinforced with a single layer rectangular steel fabric (BRC) of size B9. The wall panel size is 2000 mm in height (limited due to testing frame allowable height), 1500 mm wide and 100 mm thick which gives the slenderness ratio of 15. The wall falls under the slender wall category for lightweight concrete since the slenderness ratio is greater than 10 [1]. A central opening with a size of 600 mm high by 600 mm wide is created to accommodate the opening criterion. Experimental tests were conducted simulating fixed ends condition. The average compressive strength of SFEPS, fcu is 20.87 N/mm2 with a density, ρ of 1900 kg/m3. These lightweight SFEPS wall panels sustained load between 958.0 kN and 1938.9 kN. Wall panels experienced maximum displacement of 22.3 mm at midheight. The wall panels failed in buckling as it should be for slender wall. There was also concrete crushing at the upper and lower ends of the panels. The SFEPS wall panel is suitable to be used as load bearing structures.

Experimental Study on Prefabricated Lightweight Composite Wall Panels under Flexural Loading

2020 ◽  
Vol 9 (4) ◽  
pp. 215-225
Author(s):  
Md Kamrul Hassan ◽  
Karanraj Singh ◽  
Rohit Kumar
Keyword(s):  
Experimental Study ◽  
Flexural Strength ◽  
Lightweight Concrete ◽  
Flexural Loading ◽  
Three Samples ◽  
Wall Panels ◽  
Composite Wall ◽  
Strength And Stiffness ◽  
The Moment ◽  
Steel Stud

 The prefabricated lightweight wall panels have been widely used instead of brick walls in the modern construction industry of building due to its many advantages. As lightweight concrete is week under flexural loading, more reinforcement bars are required to improve the flexural strength of conventional lightweight wall panel. In this paper, steel studs/angles are proposed instead of reinforcement bars because the moment of inertial of steel stud/angle is higher than reinforcement bars. Experimental study has been conducted to investigate the flexural behaviour of proposed prefabricated lightweight composite (PLC) wall panels. Three samples of PLC wall panels are fabricated using lightweight concrete materials and studs. The parameters that are changed in the test specimens are material types (cold-form steel or carbon steel) and numbers of steel studs/angles. The test results show that the material types and numbers of steel studs/angles has significant impact on the flexural strength and stiffness of PLC wall panels.

scholarly journals Thermal Inertia Characterization of Multilayer Lightweight Walls: Numerical Analysis and Experimental Validation

2021 ◽  
Vol 11 (11) ◽  
pp. 5008
Author(s):  
Juan José del Coz-Díaz ◽  
Felipe Pedro Álvarez-Rabanal ◽  
Mar Alonso-Martínez ◽  
Juan Enrique Martínez-Martínez
Keyword(s):  
Lightweight Concrete ◽  
Thermal Flux ◽  
Experimental Studies ◽  
Thermal Inertia ◽  
Transient State ◽  
Experimental Tests ◽  
Building Design ◽  
Experimental Methodology ◽  
Improve Energy Efficiency ◽  
Concrete Blocks

The thermal inertia properties of construction elements have gained a great deal of importance in building design over the last few years. Many investigations have shown that this is the key factor to improve energy efficiency and obtain optimal comfort conditions in buildings. However, experimental tests are expensive and time consuming and the development of new products requires shorter analysis times. In this sense, the goal of this research is to analyze the thermal behavior of a wall made up of lightweight concrete blocks covered with layers of insulating materials in steady- and transient-state conditions. For this, numerical and experimental studies were done, taking outdoor temperature and relative humidity as a function of time into account. Furthermore, multi-criteria optimization based on the design of the experimental methodology is used to minimize errors in thermal material properties and to understand the main parameters that influence the numerical simulation of thermal inertia. Numerical Finite Element Models (FEM) will take conduction, convection and radiation phenomena in the recesses of lightweight concrete blocks into account, as well as the film conditions established in the UNE-EN ISO 6946 standard. Finally, the numerical ISO-13786 standard and the experimental results are compared in terms of wall thermal transmittance, thermal flux, and temperature evolution, as well as the dynamic thermal inertia parameters, showing a good agreement in some cases, allowing builders, architects, and engineers to develop new construction elements in a short time with the new proposed methodology.

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