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Adhesive Blister Propagation under an Orthotropic Bituminous Waterproofing Membrane
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
2013 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 48, 1171-1178 p.Article in journal (Refereed) Published
Abstract [en]

In most countries, waterproofing systems used on concrete bridge decks or roofs of buildings are generally based on orthotropic bituminous membranes; amongst these, styrene-butadiene-styrene copolymer (SBS) and atactic polypropylene (APP) polymer modified bituminous membranes are being used in most applications. One of the main technical concerns is the formation of blisters under the membrane caused by a complex mechanism governed by bottom-up pressure and loss of adhesion. This paper intends to contribute in understanding this mechanism by mechanical elastic modeling and experimental investigation. In order to study the material properties of SBS membranes under the in-plane complex stress state, the orthotropic mechanical behavior of a polymer modified bitumen membrane (PBM) was determined from biaxial test data. Hence, the measured stress-strain data were analyzed using the orthotropic equation to find the material properties in the longitudinal and transversal direction. Finally, blister tests were performed on concrete plates for studying adhesive blister propagation by applying controlled pressure between the PBM and the concrete plates. It was found that the ratio of the longitudinal to transversal adhesive blister propagation is comparable to the ratio of the modulus of elasticity in the longitudinal to transversal direction. Due to the orthotropic material property of the PBM, elliptical adhesive blister propagation was observed and a new model proposed for determining the energy for elliptical adhesive blister propagation.

Place, publisher, year, edition, pages
2013. Vol. 48, 1171-1178 p.
Keyword [en]
Biaxial test, Digital image correlation, Elliptical blister growth, Orthotropic material, PBM water proofing membrane
National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:kth:diva-123785DOI: 10.1016/j.conbuildmat.2013.07.047ISI: 000327561200137Scopus ID: 2-s2.0-84883314015OAI: oai:DiVA.org:kth-123785DiVA: diva2:630139
Note

QC 20131105. Updated from accepted to published.

Available from: 2013-06-18 Created: 2013-06-18 Last updated: 2017-12-06Bibliographically 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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