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CALL 8.0

Awarded STSMs

| CALL 8.0

Applicant: Liberato Ferrara, Politecnico di Milano, Milan (IT)

STSM Topic: Self-healing through bacterial deposition

Host: Jonjaua Ranogajec, University of Novi Sad, Novi Sad (RS)

Period: 07/05/2019 to 12/05/2019

Work Plan Summary:

The group of Prof. Ranogajec at University of Novi Sad is developing a new bacteria-based “healing promoter additive” technology for “self-healing” bio-concrete. A preliminary work on the development of bacteria healing agent encapsulated in the polymer hydrogel system has been already successfully done. The cells colony of the bacteria species of interest was monitored by measuring their lifetime in several types of polymer hydrogels and an optimization of the technological procedure was established. The efficacy of these systems have already preliminary assessed during the STSM of Dr. Bojan Milevic at Politecnico di Milano: specimens fabricated at University of Novi Sad were shipped to Milano and pre-cracked through a suitably controlled test methodology, cured and at regular intervals up to six months analysed with an optimal microscope for visual crack sealing and tested for water sorptivity changes. While the first results of the investigation were already summarized in a paper presented at the Synercrete’18 conference in Madeira, the applicant feel that an appropriate time to discuss the results together while working out at a journal paper is necessary to maximize the outcome of this synergy funded by the COST Action and this will be the main motivation of the STSM.

ApplicantEmilija Fidanchevski, Faculty of Technology and Metallurgy, Skopje (MK)

STSM Topic: The influence of SiO2 and Al2O3 on the properties and self-healing of cement base products

Host: Liberato Ferrara, Politecnico di Milano, Milan (IT)

Period: 28/06/2019 to 12/07/2019

Work Plan Summary:

The aim of the proposed short term scientific mission was to investigate the influence of silica and nano alumina in the cement based products. The content of silica and nano alumina used in the cement based products was investigated in therms to follow the mechanical properties and their effect on self-healing. Silica used in the investigation was obtained from rice husk and nano alumina was a commercial product. Cement employed in the investigation was commercial product from the cement plant Cementarnica USJE TITAN group. Also, the other purpose was to learn more in depth the techniques and methodology for selfhealing from the experienced group in this subject and to search the possibilities to up grade the actual conditions in home institution relating the self-healing.

Collage Fidanchevski (2)

 

ApplicantClaudio Larosa, University of Genoa, S' Martino (IT)

STSM Topic: Polycarbonate/graphene platelet composites applied to small cement crack repair

Host: Jonjaua Ranogajec, University of Novi Sad, Novi Sad (RS)

Period: 01/07/2019 to 14/07/2019

Work Plan Summary:

In order to seek for new solutions to repair small cracks, the research starts from commonly used routes including polymer fusions or single polymer press-molding or various polymer composites, and blending methods. The purpose of this STSM was to design polymer loaded graphene platelets (polycarbonategraphene platelet composites) and then use them to fill narrow cracks, delivering sustainable solutions. Graphene platelets as additives offer a higher resistance values to stretch and tensile forces, able to improve the optical protection of polycarbonate and stabilize the water exchange in composites. Therefore, because of native shape and a high surface area, graphene is proposed as an additive barrier against gas, liquids and microparticles in concretes. From the working plan and activities proposed, it was intended to collect data of concrete repair and PC stability showing a significant level of cement repair and stability for several years. The contribution to the scientific objectives of the Action was focused on the application of a sustainable solution to cement crack repair, in accordance with the COST action CA15202. Furthermore, this research on the self-healing approaches was considered to be in mutual interest for the host and the guest, promoting an interdisciplinary work in the field of external cement crack repair. The work addressed incorporation of additives as a load polymer matrix molded on the cracks. It also contributed to increase of available scientific knowledge in the field of composites characterisation and their application to small crack repairs by the interaction of graphene loaded polymer.

ApplicantJohn Milan van der Bergh, University of Novi Sad, Novi Sad (RS)

STSM Topic: Evaluation of self-healing capabilities in maritime conditions

Host: Ana Armada Brás, Liverpool John Moores University, Liverpool (UK)

Period: 06/07/2019 to 20/07/2019

Work Plan Summary:

The purpose of this STSM was to develop self-healing techniques for crack control of cement-based mortars in maritime environments. Within the scope of the WG1 of the “SARCOS” COST action, the research group of Prof. Ranogajec at the University of Novi Sad is aiming to further develop a new “healing promoter additive” technology for cement based mortars and concrete. This STSM comprised the first step in establishing collaboration between the Novi Sad research group mainly dealing with process technology and material composition characterisation, and Liverpool John Moores University research group of civil engineering experts led by Dr Ana Bras (Associate Professor), who focus on mechanical characteristics and durability of the produced material. The results of this STSM will serve as a basis for further investigations of the self-healing capabilities of cement-based mortars. Moreover, the results should support the future development of repair healing method by use of bacterial approach.

Collage Van der Bergh

ApplicantEtelvina Javierre, Centro Universitario de la Defensa de Zaragoza, Zaragoza (ES)

STSM Topic: Modelling of autogenous self-healing reactions

Host: Anthony Jefferson, Cardiff University, Cardiff (UK)

Period: 28/07/2019 to 11/08/2019

Work Plan Summary:

The purpose of the STSM was to establish a strong and long lasting collaboration between the applicant and the host scientific team in the context of self-healing cementitious materials. The focus of this collaboration is set on the development of reactive flow models to simulate the chemical reactions that actively participate in the closure of cracks as well as on the development of appropriate schemes for their numerical solution. The participants in this STSM have previously used models based on transport phenomena in porous media to study different of autogeneous reactions in self-healing concrete. From this common ground, the work carried out during the STSM has been divided into the following steps: - a discussion of the modelling approaches and numerical schemes used by the participants, specifically focused on their complementary aspects; - a discussion of the experimental set ups that could be reproduced by the considered computational models in order to pursue the validation of the results in the future; - the design of a general purpose problem upon which build the complementary features that were identified in the first step; - the study of the research code Cardinal of the host team and the implementation of the general purpose problem in the Cardinal code. The designed general purpose problem consists of the coupled fluid flow and reactive transport model usually used in this context. Richards’ equation models the fluid flow through the porous concrete matrix, whereas a diffusion-reaction-convection equation appears for each dissolved chemical species under consideration. Given its direct effect on the reactive flow models, the numerical treatment of Richards’ equation was defined as the main target to be addressed during the STSM.

Collage Javierre

ApplicantŁukasz Sadowski, Wrocław University of Technology, Wrocław (PL)

STSM Topic: The micromechanical and self-healing properties of the epoxy resin coatings made with recycled fine aggregate for sustainable preventive repair of concrete substrates

Host: Sabine Weiß, Brandenburg Technical University, Cottbus (DE)

Period: 11/07/2019 to 13/10/2019

Work Plan Summary:

Epoxy resin coatings are popularly used in preventive repair of concrete substrates. The micromechanical and self-healing properties of the epoxy resin coatings significantly affect its final performance. Thus, they should be better recognized in order to identify the most important factors that influence its macroscopic behaviour. Therefore, the investigation of the micromechanical and self-healing properties of the epoxy resin coating in layered systems is not an easy task. Studying these properties is still a challenge for scientists and engineers. The manufacturers allowed to add a river aggregate (1-2 mm) as an extender of the epoxy resin coating to increase its volume. But the extraction of river aggregate is mostly located far away from places where it is used. The source of this material is not renewable and its high extraction around the globe has negative impact on environment. Summarizing above, the main aim of this STSM is to verify the impact of the partial river sand replacement with recycled fine aggregate on the properties of the epoxy resin coating. Special focus has been placed on the micromechanical and self-healing properties of the epoxy resin coatings made with recycled fine aggregate for sustainable preventive repair of concrete substrates.

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ApplicantFabiano Tavares Pinto, Universidad de Córdoba, Cordoba (ES)

STSM Topic: Remote-monitoring systems for non-destructive assessment of preventive repair solutions.

Host: Ana Margarida Armada Bras, Liverpool John Moores University, Liverpool (UK)

Period: 30/09/2019 to 22/10/2019

Work Plan Summary:

The main purpose of this STSM was to contribute both to WG1 and WG2 of SARCOS, as it deals with the development of advanced monitoring techniques for characterizing (WG2) the durability and performance of self-healing solutions (WG1). During my time in a short term mission (STSM) at Liverpool John Moores University, Liverpool, United Kingdom, we assessed the viability of integrating IoT systems for monitoring concrete durability through the study of different types of humidity and resistivity sensors as well as the associated technologies for data registration and transmission applied to bio-based concretes. First a wireless-monitoring system was applied on bio-based concretes.  The idea is that these samples will be monitored for long term, changing the environmental conditions to promote the development of the selfhealing and to analyse if the sensing systems are able to detect the changes. This work was carried out in collaboration with Dr. Ana Armada Bras. Secondly the use of microwave sensors for quantification of moisture in concrete in real time was considered and training on this monitoring technique undertaken. Changes in the microwave part of the electromagnetic spectrum were used as an indicator of water quantity. The calibration of the he new monitoring sensors  is being carried out by the durability tests that are being developing in SARCOS, within WG2, at the University of Córdoba, in collaboration with Dr. Badr Abdullah and Dr. Ana Armada Bras.

Collage Tavares