Concrete | Ricerc@Sapienza

Thermogravimetry and Differential Thermal Analysis (TG-DTA)

Lingua Italiano

La TGA-DTA simultanea permette di identificare in modo semi-quantitativo e qualitativo i componenti di una sostanza che in un determinato intervallo di temperatura perde peso e/o assorbe calore. La simultaneità delle due analisi aumenta la possibilità di identificazione. La strumentazione è costituita da una termobilancia che con un sistema di termocoppie permettere di registrare contemporaneamente le perdite di peso dovute a decomposizioni/trasformazioni dei costituenti della sostanza in esame e gli assorbimenti/emissioni di calore caratteristici delle loro trasformazioni.

Residual capacity and permeability-based damage assessment of concrete in damaged RC columns

An experimental investigation was conducted to evaluate both residual capacity and the damage of the concrete material in previously damaged RC columns. Three circular columns, each caged to provide low, medium, and high level of confinement, were axially loaded to failure. All damaged columns were then cut into three pieces, and two cored cylinders were taken from each piece. The first core was prepared and instrumented for compression, whereas the second was sliced into a number of 25-mm disks for permeability testing.

Local and global prediction on stress-strain behavior of FRP-confined square concrete sections

The objective of this paper is to introduce a modified local-to-global methodology to understand the effect of fiber reinforced polymer (FRP) confinement on square concrete section. Traditionally, the effect of confinement on square sections has been evaluated through the so-called "arching effect" developed for steel and FRP-confined sections. FRP-confined square section was characterized by a non-uniform confinement stress field, which makes concrete strength strongly position dependent.

Determination of concrete cover thickness in a reinforced concrete pillar by observation of the scattered electromagnetic field

The electromagnetic scattered field by a reinforced concrete structure is calculated by means of frequency-domain numerical simulations and by making use of the scattered-field formulation.

Design of the first Italian roundabout with jointed plain concrete pavement

This work presents the results of the overall design of the ﬁrst Italian roundabout with jointed plain concrete pavement. The examined case study complies with current international standards and practices for geometry of roundabouts and road pavements. The construction of a concrete pavement in an urban roundabout will better manage and slow down fast vehicular ﬂows, and increase trafﬁc ﬂuidity in an important junction, trafﬁcked by heavy vehicles, where maintenance works should be reduced to avoid queues.