Influence of polymer addition on biogenic sulfuric acid attack of concrete

Vincke, E; Wanseele, Ellen Van; Monteny, Joke; Beeldens, Anne; Belie, Nele De; Taerwe, Luc; Gemert, Dionys Van; Verstraete, Willy

doi:10.1016/s0964-8305(02)00055-0

Cited by 96 publications

(45 citation statements)

References 23 publications

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“…In tanks with biodegradable material, the pH was as low as 5.5. Vincke, et al (2002) studied the influence of different additives on the hydrogen sulphide oxidation and sulphuric acid production. In their study, in laboratory scale experiments, the pH decreased from 8 to 1 in microbially active systems.…”

Section: Low and Intermediate Radioactive Waste Repositoriesmentioning

confidence: 99%

Analysis of mineralogical and deformation-induced transformations of Nizhnekansky Massif rocks to estimate their retention capacity in geological disposal and isolation of radioactive waste

Петров¹,

Poluektov²,

Hammer³

et al. 2015

gzh

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JT03354141Complete document available on OLIS in its original format This document and any map included herein are without prejudice to the status of or sovereignty over any territory, to the delimitation of international frontiers and boundaries and to the name of any territory, city or area. . Since then, there have been major developments in a number of national geological disposal programmes and significant experience has been obtained in preparing and reviewing cases for the operational and long-term safety of proposed and operating geological repositories. Especially, three national programmes are now, or will shortly be, at the stage of licence application for a deep geological repository for the disposal of spent nuclear fuel or high-level and other long-lived radioactive waste.Thus, the purpose of this Symposium, "The Safety Case for Deep Geological Disposal of Radioactive Waste: 2013 State of the Art", was to assess the practice, understanding and roles of the safety case, as applied internationally at all stages of repository development, including the interplay of technical, regulatory and societal issues, as they have developed since 2007.The Symposium was organised and hosted by the Nuclear Energy Agency (NEA) of the Organisation for Economic Co-operation and Development (OECD), and co-sponsored by the EC and the IAEA.The 2013 Symposium attracted 168 participants from 65 organisations and 17 countries and international bodies.The Symposium was chaired by Klaus-Jürgen Röhlig, who is also the Chair of the NEA Integration Group for the Safety Case (IGSC). The planning and implementation of the symposium were supported by the efforts of staff of the NEA and of the programme committee.This synopsis was drafted by Trevor Sumerling (Safety Assessment Management Ltd, UK), finalised under the direction of the Chair and Gloria Kwong of the NEA and approved by the programme committee. Deep Geological Repositories (1999). Since then the concept has been elaborated on in NEA documents describing the nature and purpose of safety cases , 2013a and has been the basis of NEA/IGSC collaborative projects and EU projects (EC, 2011). The concept has been taken up in international safety standards as promulgated by the IAEA (2006, 2011) and recently in ICRP recommendations on the application of the system of radiological protection to geological disposal (ICRP, 2013).Meanwhile, the concept has been developed practically and applied within many national radioactive waste disposal programmes and also taken up in some national regulatory guides. The NEA has used the concept as a guide in several international peer reviews of national repository programmes and safety documentation. In Europe, the EU Directive 2011/70/Euratom (EU, 2011) establishes a framework to ensure responsible and safe management of spent fuel and radioactive waste by member states that, inter alia, requires a decision-making process based on safety evidence and arguments that mirrors the safety case concept. Aims of the symposiumThe purpose of thi...

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Section: Low and Intermediate Radioactive Waste Repositoriesmentioning

confidence: 99%

Analysis of mineralogical and deformation-induced transformations of Nizhnekansky Massif rocks to estimate their retention capacity in geological disposal and isolation of radioactive waste

Петров¹,

Poluektov²,

Hammer³

et al. 2015

gzh

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“…The dissolution effect of the hydrogen ion and the separate effect of the sulfate ion combine to create an aggressive set of chemical reactions, threatening the stability of a cement matrix. Debate exists however regarding the mechanisms behind chemical and biological sulfuric acid attacks, and resistance to the former does not necessarily result in resistance to the latter [4,9,48]. Explanations centre on the involvement of the sulfuric acid producing bacteria Thiobacillus where Monteny et al [4] claim that it is the moist conditions in the gypsum corrosion front that constitute an excellent breeding ground for the bacteria to thrive.…”

Section: Attack Mechanismsmentioning

confidence: 99%

“…Experiments exposing 100mm Portland cement concrete cubes with a binder of 35% ordinary Portland cement (OPC) / 65% GGBS to an H 2 SO 4 solution for five months, as described in BRE Digest 363 [54], reported higher performance than for binders of 100% sulfate resisting Portland cement (SRPC) or 75% OPC / 25% PFA [28]. This improved performance of concrete in acidic conditions has been attributed to either lower porosity, lower levels of calcium hydroxide or both [4,45,48] while Saricimen et al [54] determined that in a 3% flowing H 2 SO 4 solution neither SRPC nor OPC showed any difference in resisting attack, a conclusion supported by [7]. Monteny et al [39] suggest that a refined pore structure will increase the capillary action of the cement matrix and act as a mechanism for the aggressive solution to find its way deeper into the concrete.…”

Section: Types Of Sulfuric Acid Attackmentioning

confidence: 99%

Biochemical attack on concrete in wastewater applications: A state of the art review

O’Connell

McNally

Richardson

2010

Cement and Concrete Composites

215

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Publication informationCement and Concrete Composites, 32 (7) AbstractThe costs associated with the provision and maintenance of drinking water and wastewater infrastructure represents a significant financial demand worldwide. Maintenance costs are disproportionately high, indicating a lack of adequate durability. There remains a lack of consensus on degradation mechanisms, the performance of various cement types, the role of bacteria in the corrosion process associated with wastewater applications and testing methodologies. This paper presents a review of the literature, outlining the various research approaches undertaken in an effort to address this problem. The findings of these varying approaches are compared, and the different strategies employed are compiled and discussed. It is proposed that a key step in advancing the understanding of the associated deterioration mechanism is a combined approach that considers the interaction between biological and chemical processes. If this can be achieved then steps can be taken to establishing a performance-based approach for specifying concrete in these harsh service conditions.

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“…Vincke et al [31] have especially shown that the addition of acrylic and styrene-butadiene modify the porous network by influencing the paste-aggregates transition zone and by clogging the microscracks. The EPS 180 admixture seems then also to modify the transfers inside the cement paste porous network and the EPS 180 coatings at the cement paste samples surface (painted or sprayed) control the water absorption.…”

Section: Capillary Imbibitions Testsmentioning

confidence: 99%

“…Means to improve the resistance against penetration of aggressive elements in concrete are to decrease its porosity or to modify its geometry by incorporating polymers in its formulation [30,31]. When corrosion inhibitors are applied on the surface of concrete, the protection against corrosion is more often due to the reduction of penetration towards the concrete of aggressive elements present in the water than to a direct inhibiting action on the rebars surfaces.…”

Section: Introductionmentioning

confidence: 99%

Influence of a biopolymer admixture on corrosion behaviour of steel rebars in concrete

Roux¹,

Bur²,

Ferrari³

et al. 2010

Materials & Corrosion

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International audienceAmong the multitude of concrete structure pathologies, corrosion of rebars is one of the most important problems of concrete durability. In the context of sustainable development, it appears of primary importance to develop new means to protect the rebars against corrosion. This study aims to develop a new eco-friendly and corrosion-inhibiting admixture based on EPS 180 exopolysaccharides, biopolymers used in coatings already studied for the corrosion inhibition on steel in seawater. C15 rebars embedded in CEMI and CEMV cement paste containing EPS 180 were immersed in natural seawater and their electrochemical behaviour was studied using open circuit potential measurements and electrochemical impedance spectroscopy. These tests highlight the decrease of the cathodic reaction kinetics due to the EPS 180 action at the rebars surface, and the absence of effect on the passive layer. Capillary imbibition tests carried out on cement paste and mortars showed that although limiting the imbibition kinetics for cement pastes, the EPS 180 did not influence the water imbibition of mortars. Tests comparing capillary imbibition of soaked cement pastes and mortars with EPS 180 solution and the same samples containing the EPS 180 admixture highlight that the corrosion inhibition induced by EPS 180 admixture is more due to the modification of the cement - rebars interface than to the clogging of the cement porous network

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Influence of polymer addition on biogenic sulfuric acid attack of concrete

Cited by 96 publications

References 23 publications

Analysis of mineralogical and deformation-induced transformations of Nizhnekansky Massif rocks to estimate their retention capacity in geological disposal and isolation of radioactive waste

Analysis of mineralogical and deformation-induced transformations of Nizhnekansky Massif rocks to estimate their retention capacity in geological disposal and isolation of radioactive waste

Biochemical attack on concrete in wastewater applications: A state of the art review

Influence of a biopolymer admixture on corrosion behaviour of steel rebars in concrete

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