Influence of substrate texture on the tensile and shear bond strength of rendering mortars

Stolz, Carina Mariane; Masuero, Ângela Borges; Pagnussat, Daniel Tregnago; Kirchheim, Ana Paula

doi:10.1016/j.conbuildmat.2016.10.097

Cited by 38 publications

(21 citation statements)

References 13 publications

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“…The increase in mortars and concretes consistency associated to the use up to 0.5% of short (< 20 mm) polypropylene and PVA fibers was also detected in other studies (ALY; SANJAYAN; COLLINS, 2008; PEREIRA-DE-OLIVEIRA; CASTRO-GOMES; NEPOMUCENO, 2012; FRANÇA; CARDOSO; PILEGGI, 2016). For render, the mortar rheology may have significantly influence on the tensile bond strength (STOLZ et al, 2016). However, interactions with other parameters, such as substrate texture (roughness and porosity) and energy of application, lead to a more complex system that mortar rheology alone cannot explain (ZANELATTO et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

“…One solution that is being considered to reduce the effects of plastic shrinkage in cement-based materials is the use of small contents of synthetic fibers. Several studies have been carried out on this topic (SANJUAN;MORAGUES, 1997;MESBAH;BUYLE-BODIN, 1999;ALY;SANJAYAN;COLLINS, 2008; PEREIRA-DE-OLIVEIRA; CASTRO-GOMES; NEPOMUCENO, 2012). However, most of these studies focus on concrete application or high strength mortars.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of early age cracking in rendering mortars with polypropylene fibers

2018

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The incorporation of fibers in concrete produces an improvement in the characteristics of the material as observed in different studies. In order to obtain the same good results, fibers are added to rendering mortars to reduce some of their drawbacks. However, this type of mortar has some specific characteristics, such as hydrated-lime utilization or higher air, which is not usual in concrete. Thus, this study aims to evaluate the potential of polypropylene fibers to reduce early age cracking caused by restrained shrinkage in rendering mortars. Two types of mortars were used to verify possible differences in the way they responded to the introduction of fiber. The influence of the fiber content was also investigated. Mortars were evaluated in fresh state, and mechanical behaviors were measured at several ages. The restrained shrinkage cracking was followed for 21 days using the ring test method. The use of polypropylene fibers leads a smaller value of total crack width and a delay of the first crack. Also, the elastic modulus shows a higher correlation with the mortars crack width. Both parameters were successfully used to predict the mortars crack width. The ring test method may be a suitable test method to evaluate the capacity of fibers to control the crack formation in rendering mortars.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of early age cracking in rendering mortars with polypropylene fibers

2018

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“…In turn, Sadowski and Hoła [18][19][20][21][22][23][24] proved that predicting the values of f b is possible based on non-destructive testing (NDT) using artificial neural networks (ANN). An evaluation at a lower level of observation mainly involved the observation of the interphase zone and its destruction, which occurred after tests using the pull-off method [25][26][27][28][29][30][31][32][33][34][35] and also bending [36][37][38][39][40], shear [26,34,39,[41][42][43][44][45][46][47][48][49][50][51][52][53][54], flexural [55,56], direct tensile [57,58], splitting prism [59], splitting tensile [34,46,47,…”

Section: Literature Reviewmentioning

confidence: 99%

Multi-Scale Evaluation of the Interphase Zone between the Overlay and Concrete Substrate: Methods and Descriptors

Sadowski

2017

Applied Sciences

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This article presents the problem of examining the interphase zone between the overlay and concrete substrate at different levels of observation. The possibility of applying available modern research methods in order to examine the interphase zone with regard to the level of observation is presented. These levels were defined in the paper. Examples of tests that show a possible approach to the examination of the interphase zone are also presented.

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“…Stolz et al [30] stated that increasing the real (effective) contact area between the existing concrete substrate and the overlay, as a result of different surface textures, does not always increase the interlayer bond. On the other hand, the rheology of the hardening overlay seems to be the main factor influencing the adhesion [30]. As mentioned by Halicka and Franczak [31], the adhesion level between hardening overlay and substrate usually increases with time.…”

Section: Introductionmentioning

confidence: 99%

“…The porosity, morphology, and microcracking of the concrete substrate have a significant effect on the adhesion level [23][24][25][26][27][28][29]. Stolz et al [30] stated that increasing the real (effective) contact area between the existing concrete substrate and the overlay, as a result of different surface textures, does not always increase the interlayer bond. On the other hand, the rheology of the hardening overlay seems to be the main factor influencing the adhesion [30].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution within the Interphase between Hardening Overlay and Existing Concrete Substrates

Sadowski

Stefaniuk

2017

Applied Sciences

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This article presents the microstructural evolution within the interphase between a hardening overlay made of cement mortar and an existing concrete substrate. The substrate has been treated using four methods, due to which different surfaces were obtained: a raw surface, a surface formed after contact with the formwork, a grinded surface, and a shotblasted surface. Special focus is placed on the results of the microporosity within the interphase zone (IZ) using X-ray micro computed tomography (micro-CT). The microporosity profiles obtained from the micro-CT images have been used to assess the nature of the IZ between the hardening overlay and the existing concrete substrate. It has been shown that microporosity and the number of pores in the concrete within the IZ increases during the hardening time of an overlay made of cement mortar. It also depends on the applied surface treatment method. However, no significant changes in the microporosity of the existing concrete substrate have been noted.

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Influence of substrate texture on the tensile and shear bond strength of rendering mortars

Cited by 38 publications

References 13 publications

Evaluation of early age cracking in rendering mortars with polypropylene fibers

Evaluation of early age cracking in rendering mortars with polypropylene fibers

Multi-Scale Evaluation of the Interphase Zone between the Overlay and Concrete Substrate: Methods and Descriptors

Microstructural Evolution within the Interphase between Hardening Overlay and Existing Concrete Substrates

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