Estudio de la fisuración de paneles sándwich de yeso laminado y alma de lana de roca

Abstract

This paper presents the study of plasterboard and rockwool sandwich panels cracking under flexural loading. These panels are usually used to perform interior partition walls and they frequently show cracking pathology due to excessive deflexion of the slabs. There are currently no reliable simulation models and experimental data for the study of this problem. This paper presents the results of an experimental campaign aimed to characterize the fracture behaviour of sandwich panels and their individual components. In addition, the paper presents a cohesive model with embedded crack to simulate the fracture behaviour of the panel. Finally we present the results of tests for mixed mode fracture (tensile / shear) commercial panels and their behaviour is reproduced with the cohesive model proposed, yielding a good fit.

Characterization of gypsum plasterboard with polyurethane foam waste reinforced with polypropylene fibers

“…This waste product is a by-product of packaging collected from municipal recycling schemes that is subsquently milled. Other studies have been conducted on construction panels prepared with a mixture of gypsum rubber from end-of-life tires (12) and gypsum cork waste (13), both of which are characterized by their low density, as well as on the addition of recycled paper to plasterboard (14). Polyurethane foam waste has been studied in lightweight plaster materials with enhanced thermal properties in (15), although no references have been found on the use of this type of waste in the preparation of gypsum plasterboard.…”

Size effect in the fracture properties of sandwich panels of plasterboard and core of rock wool

“…Similarly, the height has been parameterised by using the characteristic length as defined by Bažant, Z.P and Planas, J. (13) with the expresssion [1]: where E is the modulus of elasticity, G F the specific fracture energy and f t the tensile strength, with each having been obtained in a previous work (6).…”

“…The cohesive model proposed has been used to reproduce the experimental results of the mixedmode fracture tests (modes I and II) carried out on sandwich panel specimens. The model uses the experimentally measured parameters that describe the fracture behaviour of panels formed by two plates of laminated plasterboard of 12 mm thickness and a insulating rock wool core of 50 mm thickness (panels 12-50-12), shown in Table 2 (6). Three-point bend (TPB) fracture tests on 74 x 74 x 333 mm 3 specimens were performed by following the RILEM 50-FMC (23) to obtain the fracture energy of the sandwich panel.…”

“…In a previous published work, the authors obtained the experimental parameters to evaluate fracture behaviour of sandwich panels made from laminated plasterboard and rock wool (6). These experimental results were used to simulate fracture with a numerical model with an embedded crack that has been used by the authors in the numerical simulation of the fracture of several quasi-brittle materials (3)(4)(5).…”

“…In order to study the influence of the size of the sandwich panels made from laminated plasterboard and rock wool, in the present work a series of mixedmode fracture tests on three sizes of specimens was first carried out. Then a cohesive crack model, implemented into a finite element with an embedded crack, was used to simulate the tests, using as an input the parameters obtained from the experiments performed in a previous work (6) and obtaining a good approximation of the experimental results. This paper also includes the study of crack growing under mixed-mode loading (type modes I and II).…”