International Conferences

A model for optimizing hooked end steel fibre reinforcements in cracked cement composites

The addition of metallic fibres in concrete is a widely used technique to increase its resistance to crack opening, energy absorption capacity, and durability. The properties of the resulting composite strongly depend on the geometry of the fibres, which usually dispose of an hooked end, as well as on the mechanical properties of both the fibre and the concrete. The…

Integrated model for predicting the flexural capacity of concrete elements reinforced with non-corrodible discrete reinforcements

Polypropylene fibres (PP) have been used mainly in non-structural applications for limiting crack width due to shrinkage effects of cement-based materials. Being insusceptible to corrosion, PP fibres can also be regarded as viable discrete reinforcement elements for the production of thin concrete elements. The relatively low elasticity modulus, tensile strength and almost frictional-based reinforcing nature of PP fibres have been…

Urban furniture in fiber reinforcemenet concrete with high durability

Within the scope of the “NG_TPfib” R&D project, Exporplás and CiviTest have, in the recent past, developed a new typology of polypropylene fibers for the production of urban furniture of high durability by eliminating conventional steel reinforcements susceptive to corrosion. This reinforcement replacement strategy also allows the development of lighter and more elegant urban furniture with complex geometries at competitive…

Thermal performance of steel and fibre reinforced concrete composite floor

In general, steel and concrete composite floors tend to present a reduced functional performance (considering thermal and acoustic conditions), due to their low mass and to the high conductivity of the steel elements. By including components with high thermal insulation capacity in these structural systems, it is possible to maintain the structure lightness and not compromise the thermal performance. Within…

Appraisal of MC2010 shear resistance approaches coupled with a residual flexural strength prediction model

In the present work the predictive performance of the two approaches proposed by Model Code 2010 for the evaluation of the shear capacity of fiber reinforced concrete (FRC) elements flexurally reinforced with conventional steel bars is assessed considering a database (DBs) constituted by 80 FRC beams do not including conventional transverse reinforcements. The accuracy of these shear models is evaluated…

Development of multifunctional sandwich panels for integrated rehabilitation of RC-buildings: characterization of the components

This research work deals with the development of a sustainable multifunctional composite sandwich panel for reinforced concrete (RC) frame buildings built in Portugal until the mid-1980s, which require structural and thermal-comfort rehabilitation. The sandwich panel, aimed specifically for interventions on building envelopes (refurbishment of building facades), is characterized by three main components: (i) thin outer concrete layers reinforced with recycled…

FRCcalc – Software for design of fiber reinforced concrete elements according to MC2010 recommendations

A new software, denominated FRCcalc, was developed for the analysis and design of fiber reinforced concrete (FRC) members based on the recommendations and design guidelines of MC2010. The software is guided for the analysis of FRC cross-sections with and without conventional steel reinforcements, submitted to bending and shear, in order to assess the ultimate and serviceability limit state safety verifications…

A new technique for the confinement of rectangular cross section reinforced concrete columns

In this work a new technique aiming an efficient confinement of reinforced concrete (RC) columns of rectangular cross-section is presented. This technique is based on the concept of applying strips of carbon fiber reinforced polymer (CFRP) wet layup sheets with a certain pre-stress level. A mechanical system was developed for pre-stressing the CFRP strips. The experimental program was composed by…

Development of sandwich panels combining sisal fiber-cement composites and fiber-reinforced lightweight concrete

This research proposes the development of innovative structural sandwich panels composed of thin outer wythes of Sisal Fiber-Cement Composites (SiFCC) and a core layer of Polypropylene FiberReinforced Lightweight Concrete (PFRLC). Sisal fibers were used in two different lengths, short sisal fibers (50 mm) randomly distributed in the matrix; and long unidirectional aligned sisal fibers (700 mm) applied by a cast…

Flexural and shear/punching strengthening of RC beams/slabs using hybrid NSM-ETS technique with innovative CFRP laminates

In this study, the potentialities of an innovative hybrid technique for the simultaneous flexural and shear/punching strengthening of existing reinforced concrete (RC) beams/slabs are experimentally assessed. This hybrid strengthening technique combines the NSM technique for the flexural strengthening and ETS technique for the shear/punching strengthening purposes in the same application using new U-shape CFRP laminates. For this purpose, two experimental…

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