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Bond behavior of steel fiber-reinforced mortar (SFRM) applied onto masonry substrate

Zampieri Paolo, Simoncello Nicolò, Libreros Jaime Gonzalez, Pellegrino Carlo

Archives of Civil and Mechanical Engineering

2020

Vol. 20, no. 3

409--428

Masonry was the most used material during the last centuries to build constructions. Most of the existing masonry structures (buildings, bridges, etc.) were built without considering some important structural considerations that are important nowadays. Moreover, due to factors such as the increasing of service loads, materials aging, structural damage, etc., the existing masonry structures require strengthening interventions. The definition of optimal strengthening strategies using traditional and innovative materials is still an important issue of the scientific research. In fact, during the last decade, many researchers focused their attention studying innovative composites materials, such as fiber-reinforced polymers and fiber-reinforced cementitious matrix composites, for the strengthening of existing masonry structures. This research has focused on aspects such as the bond behavior between the substrate and the composite materials, the structural behavior of the strengthened masonry and concrete structures, and the compatibility and reversibility of these materials when bonded to existing substrates. In this study, the bond behavior of a composite material known as steel fiber-reinforced mortar (SFRM), recently used as for the strengthening of existing structures, applied onto masonry structures is analyzed experimentally and numerically. First, the material is characterized experimentally with the aim of getting insight on its behavior and applicability when applied as an innovative technique for the strengthening of masonry and to obtain mechanical parameters required for the numerical models. Mechanical properties of the SFRM studied included flexural and compressive strength, tensile strength, and residual flexural strength. The SFRM bond behavior on masonry substrates was evaluated by means of double shear lap tests. In addition, the experimental tensile and bond behavior of the SFRM is studied numerically through finite-element models validated using the results obtained during the experimental tests. Results show that if an adequate bonded length is provided, the SFRM can fully develop its tensile strength as detachment from the substrate is not observed.

Wpływ włókien polipropylenowych na wybrane właściwości podwodnych zapraw naprawczych

Horszczaruk E., Pacewicz A.

Materiały Budowlane

2016

nr 11

114--115

W artykule omówiono wybrane właściwości zapraw cementowych przeznaczonych do naprawy podwodnych elementów konstrukcji betonowych. Zaprawy wykonano z dodatkiem pięciu rodzajów włókien polipropylenowych przy stałej zawartości pozostałych składników zaprawy, w tym domieszki stabilizującej. Włókna różniły się między sobą strukturą oraz długością, która wynosiła 12 – 38 mm. Szczególną uwagę zwrócono na oznaczenie strat wypłukania zapraw, które wykonano metodą MC-1. Dla wszystkich zapraw wykonano również normowe badania cech mechanicznych po 7 i 28 dniach dojrzewania pod wodą.

The paper presents selected properties of cement mortars for repairing underwater concrete construction elements. Mortars were made with the addition of five kinds of polypropylene fiber with a constant content of other components of mortar, including a stabilizing dopant. The fibers differed from the structure and the length of which ranged between 12 and 38 mm. Particular attention was paid to the determination of losses mortars, which are made by method MC-1. For all the mortars were also made by standards tests of mechanical properties after 7 and 28 days of curing under water.