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The effectiveness of anovel Post-Tensioned Metal Strapping(PTMS)techniqueat enhancingthe seismic behaviourof asubstandard RC buildingwas investigated through full-scale shake-tabletests duringthe EU-fundedproject BANDIT.The building had inadequate reinforcement detailing in columns and joints toreplicateold construction practices.After thebarebuildingwas initially damagedsignificantly,itwas repairedand strengthened with PTMS to perform additionalseismic tests.The PTMS technique improvedconsiderablythe seismic performance of the tested building.Whilst the bare building experienced critical damageatan earthquake of PGA=0.15g, thePTMSstrengthened building sustained a PGA=0.35gearthquake without compromising stability.

Construction has always been considered a major producer of serious environmental problems due to large consumption of resources in terms of materials and energy accompanied by environmental pollution; therefore, the projects aiming to reduce these damaging effects are more than welcome. The objective of sustainable development is difficult to be performed by civil and structural engineers at a global scale. However, some solutions and systems for load bearing and cladding elements that make the buildings or other types of civil engineering applications may contribute, at least partially, to attaining some goals of sustainability. Fiber reinforced polymeric (FRP) composite structures and hybrid systems may become sustainable when they utilise minimum material resources, increase the life span of buildings, have a very low environmental impact and ensure the high quality of civil infrastructures. The main objectives of the paper are related to the use of FRP composites in new construction components as well as rehabilitation of deteriorated civil engineering structures aiming to achieve sustainable solutions in civil and structural engineering. Starting from the concept of FRP composites and hybrid systems the authors describe a number of research and development projects carried out by the Composite in Construction Research Group (CCRG) at the Faculty of Civil Engineering, "Gheorghe Asachi" Technical University of Iasi. After a critical evaluation of FRP composite materials applied in construction, the authors describe and analyse their results which addressed a long term program including: all composite structures, multilayered sandwich construction, concrete elements reinforced with FRP composite bars, and modern solutions for structural rehabilitation of load carrying elements made of traditional building materials aiming to improve the building components performance.

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This paper presents the results of laboratory studies, undertaken by the authors, in the frame of 4D-POSTDOC research program :"Innovative technologies and logistical solutions for the reuse of demolition and construction waste in the construction of cement concrete and fiber reinforced cement concrete pavements". After the presentation of the main objectives of this research program, and of the specific characteristics of the demolition wastes investigated in parallel with those of conventional construction materials, the possibility of using these materials for the preparation of the roller compacted concrete (RCC) is investigated. Finally, conclusions on the influence of recycled aggregates and recycled steel fibers on the mechanical performances of RCC and technical recommendations for the use of this more efficient material and of the involved technology for the construction of sustainable road infrastructures are formulated.