Encontrados 6 documentos, a visualizar página 1 de 1
Evaluation of adhesion in polymeric fibre reinforced cementitious composites
Pakravan, H. R.; Jamshidi, M.; Latifi, M.; Torgal, Fernando PachecoIn this study adhesion of some polymeric fibres to a cement matrix was evaluated both by a theoretical and by an experimental approach. In common methods adhesion of the fibres to the cementitious materials is determined by pull-out test. This test evaluates the energy failure during the fibre drawing out. This paper analyzes the adhesion theory for fibre reinforced cementitious composites to separate the share...
Durability of alkali-activated binders : a clear advantage over Portland cement...
Torgal, Fernando Pacheco; Abdollahnejad, Zahra; Camões, Aires; Jamshidi, M.; Ding, YiningThe alkali activation of alumino-silicate materials is a complex chemical process evolving dissolution of raw materials, transportation or orientation and polycondensation of the reaction products. Publications on the field of alkali-activated binders, state that this new material is likely to have high potential to become an alternative to Portland cement. While some authors state that the durability of these ...
Influence of acrylic fibers geometry on the mechanical performance of fiber-cem...
Pakravan, H. R.; Jamshidi, M.; Latif, M.; Torgal, Fernando PachecoThis article analyses the influence of acrylic fibers shape on the flexural behavior of cement composite. The fibers differ in their cross-sectional shapes due to the spinning process (wet-spun and dry-spun). The fibers were characterized by optical microscopy, and the shape factors were calculated on the basis of their geometric characteristics. Results showed that both types of acrylic fiber remarkably improv...
Mechanical performance and capillary water absorption of sewage sludge ash conc...
Jamshidi, M.; Jamshidi, A.; Merdadhi, N.; Torgal, Fernando PachecoDisposal of sewage sludge from waste water treatment plants is a serious environmental problem of increasing magnitude. Waste water treatment generates as much as 70 g of dry solids per capita per day. Although one of the disposal solutions for this waste is through incineration, still almost 30% of sludge solids remain as ash. This paper presents results related to reuse of sewage sludge ash in concrete. The s...
Cementitious composites reinforced with polypropylene, nylon and polyacryloniti...
Pakravan, H. R.; Jamshidi, M.; Latifi, M.; Torgal, Fernando PachecoThis paper compares the adhesion strength between three polymeric fibres (polypropylene (PP), nylon66 (N66) and polyacrylonitrile (PAN)) embedded in a cement paste. The specimens were prepared at a water to cement ratio (w/c) of 0.5, and tested after 7, 14 and 28 curing days. It was found that although the adhesion between the polymeric fibres to the cement matrix is an important factor, the energy absorption c...
Mechanical performance of concrete with partial replacement of sand by sewage s...
Jamshidi, A.; Jamshidi, M.; Mehrdadi, N.; Shasavandi, Arman; Torgal, Fernando PachecoThe production of sewage sludge from waste water treatment plants is increasing all over the world. Disposal of sewage sludge is a serious environmental problem. If we think of the areas needed for sludge ash disposal, we clearly understand the importance of reusing sewage sludge ash in concrete. This paper presents results related to the replacement of sand by sewage sludge ash. The sludge was characterized fo...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||