Recommendation of RILEM Technical Committee 250-CSM: Test method for Textile Reinforced Mortar to substrate bond characterization

Felice, Gianmarco de; Aiello, Maria Antonietta; Caggegi, Carmelo; Ceroni, Francesca; Santis, Stefano De; Garbin, Enrico; Gattesco, Natalino; Hojdys, Łukasz; Krajewski, Piotr; Kwiecień, Arkadiusz; Leone, Marianovella; Lignola, Gian Piero; Mazzotti, Claudio; Oliveira, Daniel V.; Papanicolaou, Catherine; Poggi, Carlo; Triantafillou, Thanasis; Valluzzi, María Rosa; Viskovic, Alberto

doi:10.1617/s11527-018-1216-x

Cited by 137 publications

(76 citation statements)

References 9 publications

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“…Single-lap shear tests were conducted according to (De Felice et al 2018) in order to investigate the full interaction between rammed earth, mortar and mesh under shear loads. To this purpose, specimens manufactured with GM and NM meshes and different-bonded lengths were considered, while fixing the width of the TRM in 80 mm.…”

Section: Characterization Of the Substrate-matrix-fiber Bond Behaviormentioning

confidence: 99%

“…It should be noted that the glass fiber mesh yarns are made of bundles of fibers and that only the external ones interact directly with the mortar and then transfer the load to the core fibers (Banholzer 2006), while the core of the yarn can slip more easily. This mechanism may lead to telescopic behavior of the yarns (De Felice et al 2018) in which successive breaking down of filaments from the sleeve to the core prevents the full exploitation of the mesh tensile capacity. Figure 18(b) shows that the linear force to onset sliding at the free end seems to increase linearly with the bonded length while comprising values substantially lower than that of the maximum linear force.…”

Section: Pull-out Testsmentioning

confidence: 99%

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Experimental Investigation on the Bond Behavior of a Compatible TRM-based Solution for Rammed Earth Heritage

Romanazzi

Oliveira

2019

International Journal of Architectural Heritage

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Despite the current awareness of the high seismic risk of earthen structures, little has been done so far to develop proper strengthening solutions for the rammed earth heritage. Based on the effectiveness of TRM for masonry buildings, the strengthening of rammed earth walls with externally bonded fibers using earth-based mortar is being proposed as a compatible solution. In this context, the investigation of bond behavior was conducted by means of direct tensile tests, pull-out tests and single lap-shear tests. The specimens were prepared using earth-based mortars and two different types of meshes (glass and nylon) while considering different-bonded lengths. The direct tensile tests on TRM coupons showed the high capacity of the nylon mesh in transferring stresses after cracking of the mortar. The pull-out tests highlighted that in the case of glass fiber mesh, the bond was granted by friction, while the mechanical anchorage promoted by the transversal yarns granted the bond of the nylon mesh. Finally, the single lap-shear tests showed that the adopted earth-based mortar seems to limit the performance of the strengthening.

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Section: Characterization Of the Substrate-matrix-fiber Bond Behaviormentioning

confidence: 99%

Section: Pull-out Testsmentioning

confidence: 99%

Experimental Investigation on the Bond Behavior of a Compatible TRM-based Solution for Rammed Earth Heritage

Romanazzi

Oliveira

2019

International Journal of Architectural Heritage

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“…Shear bond test specimens were designed and constructed (for the most part), according to the recommendation of RILEM TC 250-CSM [19]. Each specimen comprised one wall prism (wallette) reinforced with a single-layer or double-layer TRM overlay on one side, which was cast according to the wet lay-up process ( Figure 2).…”

Section: Specimensmentioning

confidence: 99%

The Effect of Elevated Temperatures on the TRM-to-Masonry Bond: Comparison of Normal Weight and Lightweight Matrices

2019

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Textile Reinforced Mortar (TRM) is a composite material that has already been successfully used as an externally bonded strengthening means of existing structures. The bond of TRM with various substrates is of crucial importance for determining the degree of exploitation of the textile. However, little is known on the effect of elevated/high temperatures on the TRM-to-substrate bond characteristics while relevant testing protocols are also lacking. This study focuses on the experimental assessment of the TRM-to-masonry bond after exposure of masonry wallettes unilaterally furnished with TRM strips at 120 °C and 200 °C for 1 h. The shear bond tests on cooled-down specimens were carried out using the single-lap/single-prism set-up. Two TRM systems were investigated sharing the same type of textile, which is a dry AR glass fiber one (either in a single-layer or in a double-layer configuration) and different matrices: one normal weight (TRNM) and another lightweight (TRLM) of equal compressive strengths. At control conditions (non-heated specimens) and after exposure at a nominal air temperature of 120 °C, both single-layer TRM systems exhibited similar bond capacities. After exposure at a nominal air temperature of 200 °C single-layer and double-layer TRNM overlays outperformed their TRLM counterparts. A critical discussion is based on phenomenological evidence and measured response values.

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“…In the US, a guide to design "Externally Bonded Fabric-Reinforced Cementitious Matrix Systems" [3] and acceptance criteria for their mechanical characterization [4] has been implemented. In Europe, scientific committees have been created to define recommendations concerning a qualification procedure for TRM composites by means of tensile [5] and TRM-to-substrate bond [6] tests. Moreover, materials' identification procedures [7] and instructions for the design of structural retrofitting interventions by means of TRMs [8] was recently provided in Italy.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Adhesion of Basalt Textile Reinforced Mortars (TRM) to Clay Brick Masonry: The Influence of Textile Density

Ferrara

Caggegi

Aron

et al. 2019

Fibers

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Textile Reinforced Mortar (TRM) composite systems are gaining consensus within the scientific and technical communities as a viable and advantageous alternative to the most conventional Fibre-Reinforced Polymer (FRP) composites. Due to the good compatibility both in terms of stiffness and vapor permeability between the inorganic matrix and the substrate, the TRMs appear to be particularly well suited for strengthening masonry members and enhancing their capacity to withstand tensile and shear stresses, such as those induced by seismic shakings. This paper aims to investigate the mechanical response of a TRM system featuring an internal reinforcement made of basalt fiber textile. Therefore, the paper reports the results of an experimental campaign carried out by single-lap shear bond tests on masonry substrate reinforced by TRM strips. Three different kinds of TRM have been taken into account, each one characterized by a variable number of fabric plies. The results show that, in all cases, TRMs fail prematurely due to debonding between fabric and matrix. However, the aforementioned premature failure is the main concern emerging from these test results, and further work is requested in reformulating the matrix composition towards enhancing their tensile strength and, hence, restraining the occurrence of fabric-to-matrix debonding.

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Recommendation of RILEM Technical Committee 250-CSM: Test method for Textile Reinforced Mortar to substrate bond characterization

Abstract: manufacturing, experimental setup, test execution, and determination of test results are provided.

Cited by 137 publications

References 9 publications

Experimental Investigation on the Bond Behavior of a Compatible TRM-based Solution for Rammed Earth Heritage

Experimental Investigation on the Bond Behavior of a Compatible TRM-based Solution for Rammed Earth Heritage

The Effect of Elevated Temperatures on the TRM-to-Masonry Bond: Comparison of Normal Weight and Lightweight Matrices

Experimental Study on the Adhesion of Basalt Textile Reinforced Mortars (TRM) to Clay Brick Masonry: The Influence of Textile Density

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