Adriano Reggia

Brescia University, Civil Engineering, Architecture, Land and Environment and Mathematic (DICATAM), Post-Doc

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Adriano Reggia was born in Brescia, Italy, on July, 14 1981. In early childhood he grew between dam construction sites in Iran, Iraq and Turkey, because of his father's work. He studied in Italy until his graduation in 2006 and doctorate in 2013. From 2007 he is a professional engineer in Brescia. Since 2013 Adriano Reggia has pursued research in the area of cement-based and fiber reinforced materials as a post-doctoral fellow in the Department of Civil Engineering of the University of Brescia. He is currently involved in the study of the effects of shrinkage in jointless concrete floors, sustainable concrete structures, additive manufacturing and in high-performance fiber reinforced cementitious repairs of existing RC infrastructures.

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Papers by Adriano Reggia

ANALYSIS OF A JOINTLESS FLOOR WITH CALCIUM SULPHO-ALUMINATE AND PORTLAND CEMENT

DSCS, 2015

Synopsis: Concrete floor on ground represents an important application for concrete use in Italy.... more Synopsis: Concrete floor on ground represents an important application for concrete use in Italy. Despite their widespread use, a large percentage of concrete floors does not meet the performance requirements in terms of functionality and durability for various reasons; among them, restrained shrinkage cracking and curling represent one of the most important causes of defects. Cracking is mainly due to the drying shrinkage in presence of internal and external restraints, while curling is due to the shrinkage gradient due to the floor thickness. An analytical approach to shrinkage cracking and curling is often overlooked by designers in lieu of the design of contraction joints that allow the cracking of concrete under controlled conditions. Nowadays, the growing needs of concrete floors purchasers in terms of durability and functionality suggests the use of special concretes for flooring. For instance, the use of shrinkage-compensating concretes reduces the number of contraction joints and enhances the concrete slab performances. This study presents the non-linear finite element analysis of a jointless floor made with a shrinkage-compensating concrete obtained with the use of a blend of calcium sulpho-aluminate cement and ordinary Portland cement.

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A new restrained shrinkage test for HPC repair materials

ICCRRR, 2015

Concrete performance traditionally refers to compressive strength and workability. Recently, High... more Concrete performance traditionally refers to compressive strength and workability. Recently, High Perfor-mance Concrete evidenced the possibility of enhancing other material properties. Among these, resistance to shrinkage cracking is gaining more attention among practitioners, due to its strict relation to durability re-quirements. Shrinkage cracks occur in restrained structures: for this reason, material characterization should be made on the basis of a restrained shrinkage test. The ring test is an easy-to-use tool since one can measure the time-to-cracking of a concrete mix. Focus of this paper is to critical discuss the current standard test procedure and, then, to introduce a novel and enhanced testing set-up with the aim to reduce the time-to-cracking and to allow the measure of the post-cracking performance of the material being investigated. The work presents the results of the new test performed on High Performance Concrete, Fiber Reinforced Concrete with the addi-tional use of Internal Curing.

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TAILORING A NEW RESTRAINED SHRINKAGE TEST FOR FIBER

ACI Special Publication, 2016

The progress of concrete research during the last three decades has highlighted the possibility o... more The progress of concrete research during the last three decades has highlighted the possibility of enhancing the properties of cement-based materials, such as compressive strength or workability of the fresh mixes, as well as for other important properties like toughness, durability or volumetric stability. Among these, the resistance to shrinkage cracking is gaining an increasing attention, due to its strict relation to durability. In fact, shrinkage cracking occurs in all concrete structures when the free deformation of concrete is restrained. The higher the free shrinkage deformation and the stronger the degree of restraint, the more likely was the risk of cracking, for the same concrete strength.
Fiber Reinforced Concrete (FRC), now available into the market, allows a better crack control due to the higher toughness, which is due to the links provided by fibers between the crack faces. However, shrinkage-cracking resistance cannot be directly evaluated with traditional methods developed for FRC but it should be determined with tailored methodologies measuring the crack development under restrained shrinkage conditions.

The aim of this paper is a critical discussion on the current standard test procedures and, eventually, a proposal for a novel and enhanced testing set-up for measuring the post-cracking performance of the materials. The effects of the addition of a polymer fibers and Shrinkage Reducing Admixture (SRA) are discussed with reference to the time-to-cracking and the crack width development.

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Strengthening of a Bridge Pier with HPC: Modeling of Restrained Shrinkage Cracking

CONSEC, 2016

After more than fifty years from the opening of the largely discussed "Autostrada del Sole" Highw... more After more than fifty years from the opening of the largely discussed "Autostrada del Sole" Highway in 1964, the infrastructure system in Italy appears marked by the passing of time, similarly to what observed in several other countries worldwide. The great heterogeneity of the Italian landscape has determined a great variety of construction types, such as large span concrete bridges over the northern rivers and large arch concrete bridges over the valleys of the central region. Increment of vehicle traffic and new seismic regulations are setting new requirements to adapt the existing infrastructure, which should be otherwise replaced. Moreover, reinforced concrete (RC) aging and deterioration have led to structural and material degradation, including severe cracking and corrosion. Specialized materials such as High Performance Concrete (HPC) could represent a viable convenient solution for repairing, strengthening and retrofitting of RC structures as both structural capacity and durability can be refurbished. However, alongside high mechanical performance, HPC is characterized by a high cracking sensitivity at very early age, due to its high stiffness and shrinkage. Restrained shrinkage cracking, particularly significant in repaired structures where the existing concrete generates a considerable restraint against the free movement of the repair material, may represent a limit to the effective application of these materials. For this reason, shrinkage compatibility of HPC with the existing concrete substrate needs to be experimentally and numerically assessed. A study is herein presented where, based on experimental tests, different numerical models are developed and compared to assess and eventually minimize the risk of shrinkage cracking in bridge piers strengthened with HPC.

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EXTENDED SERVICE LIFE OF A BRIDGE PIER RETROFITTED WITH ULTRA HIGH PERFORMANCE FIBER REINFORCED CONCRETE

Rilemweek, 2018

The number of Reinforced Concrete (RC) bridges needing repair or seismic retrofit is rapidly incr... more The number of Reinforced Concrete (RC) bridges needing repair or seismic retrofit is rapidly increasing in many western countries since the most were built between the 50s and the 70s, before modern bridge design codes were developed. After 50 years from their construction, they may have experienced a series of lower-than-design earthquakes, cause of limited structural damage, or they may have endured harsh environmental conditions, cause of possible corrosion in reinforcement bars. In lieu of the substitution of the entire structures, service life of existing RC bridges can be extended adopting reliable repair or retrofit methods able to restore structural safety and durability of materials. A case study of an existing RC bridge pier retrofitted with Ultra High Performance Fibre Reinforced Concrete (UHPFRC) is presented. A thin layer of UHPFRC cast around the bridge column (i.e. jacketing) with additional reinforcements can improve seismic response to the new design levels and increase protection of reinforcements against corrosion, thanks to the high durability of the new repair material. The results of a 1:4 scale laboratory test of the retrofitted bridge pier are finally presented to demonstrate the ability of the method to improve seismic response of existing structures.

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Seismic Retrofitting of a Bridge Pier with Ultra High Performance Fibre Reinforced Concrete

ICCRRR, 2018

The increasing number of road infrastructures needing repair and retrofit is raising the problem ... more The increasing number of road infrastructures needing repair and retrofit is raising the problem of how to improve seismic behaviour for all those structures for which substitution is unlikely. This work deals with the application of a retrofitting technique for Reinforced Concrete (RC) elements based on the use of Ultra High Performance Fibre Reinforced Concrete (UHPFRC). A thin layer of UHPFRC, cast around an existing RC element, can both improve its structural performance and enhance its durability against environmental actions. This kind of rehabilitation intervention may represent, in many practical cases, a cost effective solution compared with the replacement of the entire structure. The aim of this paper is the definition of a reinforcement strategy and the presentation of a 1:4 scale laboratory test of a highway bridge pier reinforced with a 30 mm layer of UHPFRC.

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RISK OF EARLY AGE CRACKING OF BRIDGE PIERS REPAIRED WITH HPC

HPC-CIC, 2017

The increasing demand of vehicle traffic and the new performance requirements introduced by techn... more The increasing demand of vehicle traffic and the new performance requirements introduced by technical regulations concerning seismic actions, determine an urgent necessity to adapt the existing infrastructures as an alternative to their substitution. Repairing, strengthening and retrofitting of reinforced concrete structures with High Performance Concrete (HPC) offer a valuable opportunity to increase both the structural capacity and protect existing structures by the action of the environment. However, the effects of restrained shrinkage of HPC must be considered; if ignored they may lead to the premature cracking of the repair and to a lower efficacy and durability of the strengthening intervention. This study presents the evaluation of the risk of early-age cracking due to restrained shrinkage of vertical reinforced concrete elements reinforced with HPC, such as bridge piers. Results from an experimental campaign on the jacketing of segments of bridge pier will be presented.

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Suitable Restrained Shrinkage Test for Fibre Reinforced Concrete: A Critical Discussion

by Giovanni Plizzari, Fausto Minelli, and Adriano Reggia

7th RILEM International Conference on Cracking in Pavements, 2012

Caratterizzazione del comportamento fessurativo di calcestruzzi soggetti a ritiro vincolato mediante" Ring Test

by Giovanni Plizzari, Fausto Minelli, and Adriano Reggia

ANALYSIS OF A JOINTLESS FLOOR WITH CALCIUM SULPHO-ALUMINATE AND PORTLAND CEMENT

DSCS, 2015

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A new restrained shrinkage test for HPC repair materials

ICCRRR, 2015

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