Omar Moussa
École Polytechnique Fédérale de Lausanne
Ultimate tensile strengthGlass transitionThermal analysisCuring (chemistry)Isothermal processHumidityComposite materialEpoxyMaterials scienceVitrificationAdhesive bondingStiffnessConstruction industryFull recoveryPost curingDifferential scanning calorimetryPolymerAdhesiveFibre-reinforced plastic
7Publications
5H-index
176Citations
Publications 7
Newest
#1Omar Moussa (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 5
#2Anastasios P. Vassilopoulos (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
Last. Thomas Keller (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
view all 4 authors...
The long-term changes in the thermophysical and mechanical properties of a cold-curing structural epoxy adhesive were investigated by accelerating the curing reaction by post-curing at elevated temperatures. Experimental data concerning the glass transition temperature for periods of up to 7 years and tensile strength and stiffness measurements could be extrapolated for a period of up to 17 years. An existing model for the long-term development of concrete properties was modified for the predict...
25 CitationsSource
#1Omar Moussa (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 5
#2Anastasios P. Vassilopoulos (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
Last. Thomas Keller (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
view all 4 authors...
The thermomechanical recovery behavior of a commercial cold-curing structural epoxy adhesive was investigated. Exposing the adhesive to temperatures above the glass transition temperature T-g significantly increased the latter although the curing degree increased only marginally. Cooling the adhesive from temperatures above T-g to temperatures below T-g led to full recovery of the mechanical properties (tensile stiffness and strength). The secondary bonds between the polymer chains fully reforme...
39 CitationsSource
#1Omar Moussa (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 5
#2Anastasios P. Vassilopoulos (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
Last. Thomas Keller (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
view all 4 authors...
The early-age mechanical property development of structural adhesives during low temperature curing is critical for the outdoor construction of engineering structures, such as bridges or buildings. Construction of these structures is also carried out during winter time at low curing temperatures. Experimental investigations showed that the development of the tensile properties of a commercial structural epoxy adhesive strongly depended on the curing temperature. Lower curing temperatures signifi...
47 CitationsSource
#1Omar Moussa (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 5
#2Anastasios P. Vassilopoulos (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
Last. Thomas Keller (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
view all 3 authors...
A new DSC-based experimental method to efficiently establish the glass transition temperature, Tg, vs. curing degree, α, relationship for structural adhesives was developed. The method approaches the continuous Tg-α relationship with a trilinear curve established on the basis of several non-isothermal scans instead of time-consuming isothermal scans. Although the method is independent of the heating rate, a rate of 5 °C/min was found to be the best compromise for experimental and practical purpo...
18 CitationsSource
#1Omar Moussa (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 5
Last. Thomas KellerH-Index: 45
view all 4 authors...
Adhesive bonding is a material-tailored method used to connect structural components made of fiber-reinforced polymer (FRP) composites. Compared to mechanical connections, e.g. bolts, in this method stresses are gradually introduced into the polymer matrix of the adherend before being transferred through the matrix into the fibers. A characteristic of the construction industry is that joining is usually carried out on the construction site and therefore only coldcuring adhesives can be used. The...
2 Citations
#1Omar Moussa (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 5
#2Anastasios P. Vassilopoulos (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
Last. Thomas Keller (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
view all 3 authors...
The effect of low-temperature curing on the physical characteristics of a commercial cold-curing epoxy adhesive was experimentally and analytically investigated with a view to a potential application in bridge construction in winter. Curing at low temperatures of 5-10 degrees C took place but the curing process was significantly decelerated due to material vitrification and the associated diffusion-controlled reaction. Existing dynamic and isothermal curing models developed for hot-curing adhesi...
59 CitationsSource
#1Omar MoussaH-Index: 5
Last. Thomas KellerH-Index: 45
view all 4 authors...