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Comparison between Blister Propagation and Peeling Test for an Orthotropic Bituminous Waterproofing Membrane
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
Swiss Federal Laboratories for Material Science and Technology.
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
(English)Article in journal (Other academic) Submitted
Abstract [en]

Bridge decks are commonly subjected to harsh environmental conditions that often lead to serious corrosion problems, which are triggered by blisters under the hot mix asphalt bridge deck pavement with waterproofing membranes. These blisters are secretly evolving during weather exposure until often being detected too late. Formation of blisters under the waterproofing membrane is caused by a complex mechanism governed by bottom-up pressure and loss of adhesion. This paper intends to adopt the analytical blister propagation energy approach for waterproofing membranes and compare it with adhesive fracture energy from standard peeling test methods, already described in the literature. Three different types of polymer modified bitumen membranes (PBMs) were used for this purpose. The investigation includes a comparison between uniaxial and biaxial testing conditions for determining the modulus of elasticity of the membranes. Moreover, the influence of the displacement rate and temperature on the adhesive fracture energy in peeling tests is investigated. It was found that the biaxial modulus of PBM in the longitudinal and transversal direction is comparable with the uniaxial tension testing results in the main directions. In addition, it was observed that the ratio of longitudinal and transversal modulus of elasticity was similar. The energy calculated from tests with elliptical blister propagation showed a comparable value to the standard peeling fracture energy for similar types of PBMs. This indicates that the peeling test assists in ranking the adhesive properties of different types of membranes. It also allows ranking between the membranes with respect to resistance to blister formation without time consuming and complicated pressurized blister propagation tests and digital image correlation techniques.

Keyword [en]
PBM waterproofing membrane, orthotropic material, biaxial test, peeling test, elliptical blister growth, digital image correlation
National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:kth:diva-124071OAI: oai:DiVA.org:kth-124071DiVA: diva2:632529
Note

QS 2013

Available from: 2013-06-25 Created: 2013-06-25 Last updated: 2013-06-25Bibliographically approved
In thesis
1. Mechanisms of Blister Formation on Concrete Bridge Decks with Waterprooving Asphalt Pavement Systems
Open this publication in new window or tab >>Mechanisms of Blister Formation on Concrete Bridge Decks with Waterprooving Asphalt Pavement Systems
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Bridge decks are commonly subjected to harsh environmental conditions that often lead to serious corrosion problems triggered by blisters under the hot mix asphalt bridge deck surfacing and secretly evolving during weather exposure until damage is often detected too late. Blisters may form under both the waterproofing dense mastic asphalt layer or under the waterproofing membrane which is often applied as additional water protection under the mastic asphalt (MA). One of the main technical issues is the formation of blisters under the membrane and asphalt-covered concrete structures caused by a complex mechanism governed by bottom-up pressure and loss of adhesion.

A linear viscoelastic finite-element model was developed to simulate time-dependent blister growth in a dense mastic asphalt layer under uniformly applied pressure with and without temperature and pressure fluctuation. A finite element model was developed using ABAQUS with linear viscoelastic properties and validated with a closed form solution from first-order shear-deformation theory for thick plates. In addition, the blister test was conducted on different samples of MA in the laboratory and digital image correlation measurement technique was used to capture the three-dimensional vertical deflection of the MA over time. It was found that the blister may grow continuously under repeated loading conditions over subsequent days.

With respect to blistering under waterproofing membranes, mechanical elastic modeling and experimental investigations were performed for three different types of membranes under in-plane stress state. The orthotropic mechanical behavior of a polymer modified bitumen membrane (PBM) was determined from biaxial test data. Finally, blister tests by applying controlled pressure between orthotropic PBMs and concrete plates were performed for studying the elliptical adhesive blister propagation using digital 3D image correlation. The energy calculated from elliptical blister propagation was found comparable to the adhesive fracture energy from standard peeling tests for similar types of PBMs. This indicates that the peeling test assists to evaluate and rank the adhesive properties of different types of membranes with respect to blister formation at room temperature without conducting time consuming and complicated pressurized blister propagation tests using digital 3D image correlation.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. x, 97 p.
Keyword
blister growth, PBM waterproofing membrane, orthotropic material, biaxial test, peeling test, elliptical blister growth
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-124078 (URN)
Presentation
2013-06-13, B25, Brinellvägen 23, KTH, Stockholm, 09:30 (English)
Opponent
Supervisors
Note

QC 20130625

Available from: 2013-06-25 Created: 2013-06-25 Last updated: 2013-06-25Bibliographically approved

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