Henrik Erndahl Sørensen

Henrik Erndahl Sørensen
Danish Technological Institute · Concrete Centre

MSc, PhD

About

43
Publications
17,495
Reads
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381
Citations
Introduction
Henrik Erndahl Sørensen currently works at the Concrete Centre, Danish Technological Institute. Henrik does research in Materials Engineering and Civil Engineering with focus on Concrete Technology.
Additional affiliations
January 2016 - May 2021
Danish Technological Institute
Position
  • Business Development Manager
September 2005 - December 2015
Danish Technological Institute
Position
  • Team manager, Structures
April 1999 - August 2005
FORCE Technology
Position
  • Consultant

Publications

Publications (43)
Conference Paper
Full-text available
The ingress of chloride into three Danish bridges located in marine environments has been studied by means of chloride profiles measured on concrete cores from submerged conditions. The sample materials represent three different concrete types and exposure times ranging from 30 to 34 years. Chloride transport parameters such as the achieved chlorid...
Article
Full-text available
A recent observation showed a square root time dependency of the ingress depth of a fixed (reference) chloride concentration of 0.05% chloride by mass of concrete for submerged exposure in Kattegat and the Baltic Sea. The purpose of this paper is to assess the applicability and limitations of the observation, widen the scope of validity and propose...
Article
Full-text available
Testing the critical chloride content (Ccrit) in laboratory samples or in samples retrieved from structures enhances the understanding of rebar corrosion initiation in concrete and can result in a significant improvement of predicting the residual service life of ageing structures. A possible drawback of test methods for Ccrit is that they can be t...
Article
Full-text available
After ten years of marine exposure, chloride and calcium profiles and petrographic data were obtained from the tidal and submerged zones of six concrete panels differing in binder composition. Moisture and portlandite profiles were also determined on the submerged concrete. The data enables us to improve our understanding of the impact of sea water...
Article
The steel–concrete interface (SCI) is known to influence corrosion of steel in concrete. However, due to the numerous factors affecting the SCI—including steel properties, concrete properties, execution, and exposure conditions—it remains unclear which factors have the most dominant impact on the susceptibility of reinforced concrete to corrosion....
Article
Full-text available
Due to stochastic and systematic variations in the paste fraction, data for total chloride content are occasionally calibrated using parallelly measured calcium content as a measure of the actual paste fraction − assuming non-calcareous aggregates and no calcium leaching. Data from concrete exposed at the marine Fehmarn Belt Exposure Site questions...
Article
Full-text available
The steel–concrete interface (SCI) is a complex, multi-phase and multi-scale system. It is widely known to influence the performance and long-term durability of concrete structures. However, a fundamental understanding of its properties and effects on corrosion initiation of embedded reinforcing steel remains elusive. This is attributed to its comp...
Article
Results of more than 5 years of in situ reinforcement corrosion monitoring are presented including continuous measurements of concrete resistivity, temperature, and open circuit corrosion potential measurements. Depth dependent resistivity and temperature measurements were obtained by means of multi-ring electrodes, while so-called instrumented reb...
Conference Paper
Full-text available
The so-called "chloride threshold value" may be defined as the minimum concentration of chloride that is able to initiate corrosion of the steel embedded in a reinforced concrete structure. This value is a crucial input parameter for service life modelling of concrete structures exposed to chlorides, e.g. structures located in marine environments o...
Conference Paper
Full-text available
This paper presents new results from a long-running study following the chloride ingress in concrete blocks exposed at the marine exposure site located at Rødbyhavn harbour in Denmark. The site was established in 2010 as part of the preparatory work for the planned Fehmarnbelt fixed link between Denmark and Germany. Chloride profiles have previousl...
Chapter
Fly ash is often used as supplementing cementitious material for marine concrete structures. In these cases, the development of a dense microstructure is typically slower than for other types, and the resistance against chloride ingress at early age is at a low level, but will develop to a high level during the first 6 to 12 months. Early chloride...
Conference Paper
Full-text available
HEALCON is an EU-FP7 project which aims to develop self-healing concrete to create durable and sustainable concrete structures. While during the first years of the project the self-healing materials (including the healing agents and suitable encapsulation methodologies) and monitoring techniques were designed and tested at lab-scale, large scale el...
Conference Paper
Full-text available
The threshold value for chloride initiated reinforcement corrosion is of major importance for the outcome of estimates from service life models. Unfortunately, a generally accepted standard test method for determination of this parameter does not exist. The durability of the coming Fehmarnbelt link between Denmark and Germany is highly depending on...
Conference Paper
Full-text available
Femern A/S, the Owner of the coming Fehmarnbelt Fixed Link, has built a marine field exposure site in the harbour of Roedbyhavn as a part of the preparations for the coming 17.6 km long immersed tunnel between Denmark and Germany, which will be the longest combined rail and road tunnel to date. A total of 15 large concrete blocks (2 x 1 x 0.2 m) wi...
Conference Paper
Full-text available
The reliablility of all commonly used service life models for chloride exposed concrete structures is highly dependent on the applied input parameters of the models, e.g. the chloride threshold value for initiation of reinforcement corrosion. Since 2011, a number of different experiments have been conducted at Danish Technological Institute with th...
Conference Paper
Three concrete blocks instrumented with rebars, anode ladders and other sensors have been produced and exposed to sea water in Fehmam Belt field exposure site in Roedbyhavn in Denmark. The corrosion activity on the anode ladders is continuously monitored by measurements of half-cell potentials and linear polarisation resistance. The design of the i...
Conference Paper
Full-text available
The precision of the existing service life models for chloride exposed concrete structures is highly dependent on the chloride threshold values for the actual exposure conditions and binder compositions. Therefore, a reli-able determination of the chloride threshold values for initiation of reinforcement corrosion in concrete struc-tures becomes of...
Conference Paper
Full-text available
A Danish Expert Center for infrastructure constructions was established in 2010 setting a platform for cooperation between the Danish Technological Institute and the Technical University of Denmark for the study of durability of reinforced concrete in aggressive environments. The cooperation runs over a three year period, with primary focus on the...
Chapter
Full-text available
The use of sensors for monitoring material properties and structural health in buildings and civil structures yields obvious technical and economical advantages for building owners and for society. Repair and maintenance of buildings and structures are typically performed only on the basis of a visual inspection, sometimes combined with a more thor...
Conference Paper
Full-text available
The use of sensors for monitoring material properties and structural health in buildings and civil structures yields obvious technical and economical advantages for building owners and for the society. The repair and maintenance of buildings and structures are typically performed only on the basis of a visual inspection, sometimes combined with a m...
Conference Paper
Full-text available
A Danish innovation consortium has been formed in 2007 under the acronym ‘SensoByg’. It addresses the application of wireless sensors in concrete structures in particular and in the construction industry in general. SensoByg consists of 6 R&D performers and more than 10 industry participants, having a 4 M€ budget running in the period 2007-2010. Th...
Technical Report
Full-text available
This report is a part of a series of 3 review reports published by 3 task groups in the NORECON network. The main objective of Task T1 is to present a review report for the subject "Decisions and requirements for repair" in an objective form, and to make this available for all interested paraties in industry and society. Special attention is given...
Conference Paper
Full-text available
Half-cell potentials and corrosion rate measurements are compared and evaluated. The paper presents four different on-site cases. The first example is from a bridge pillar exposed to de-icing salts. This example shows a good correlation between corrosion rate and half-cell potential mapping. The second is a dry structure where high half-cell potent...
Technical Report
Full-text available
Concrete for the environment, green concrete.
Conference Paper
Full-text available
Half-cell potential measurements (HCP) have been used for many years to evaluate the corrosion activity of the steel reinforcement in concrete structures. However, this technique has some limitations: It is not possible to estimate the corrosion rate -only a corrosion risk, and, the HCP measurements are difficult to interpret in wet conditions. The...
Article
Full-text available
International Journal for Restoration of Bulidings and Monuments. Vol. 8, No. 1, 2002. p. 127-130. ISSN 0947-4498
Article
Full-text available
This paper presents the results of the round-robin test carried out in the Nordic countries to evaluate the repeatability and reproducibility of three Nordic test methods for measuring the chloride diffusion coefficient of concrete. The three methods were: NT BUILD 443, NT BUILD 355 and the CTH Rapid Test. A total of nine laboratories from Denmark,...
Conference Paper
Full-text available
Based on a mathematical analysis of the LIGHTCON-model a new mathematical model for prediction of corrosion initiation from corrosion sensor data has been suggested. This new model is based on various assumption including: 1) The chloride diffusion coefficient of the concrete and the chloride threshold value for corrosion initiation are independen...
Conference Paper
Full-text available
A necessary condition for crack development in concrete due to alkali-aggregate reaction is that the concrete contains: reactive rock types or minerals, alkali metal ions, and water (concrete humidity >80% RH. Aggregates with alkali minerals may release alkalies in concrete, as the pH values are often 12-13 in most concretes. If alkalies are releas...
Article
Full-text available
Factors affecting the chloride threshold for the initiation of reinforcement corrosion in uncracked concrete were investigated for concrete and mortar corrosion cells with cast-in-place steel electrodes representing the reinforcement. The results indicated that the exposure conditions and the microstructure of the cover both have a strong influence...
Conference Paper
Full-text available
During 1997 the migrating corrosion inhibitor (the organic type) was introduced in Denmark, mainly for the renovation of reinforced concrete structures The paper deals with the documentation tests carried out before the introduction and the various applications of the migrating corrosion inhibitor (MCI) for repair work The tests were performed usin...
Technical Report
Full-text available
In this project a round-robin test was carried out in the Nordic countries to evaluate the repeatability and reproducibility of the three Nordic test methods for measuring the chloride diffusion coefficient of concrete: NT BUILD 443, NT BUILD 355, and the CTH Rapid Test. Nine laboratories from Denmark, Sweden, Norway and Island participated in the...
Technical Report
Full-text available
This report is part of a series of reports generated in the research project HETEK headed by the Danish Road Directorate, The present subtask is concerning chloride transport into concrete and this report is about the effect of the w/c ratio on the diffusivity of chlorides in concrete measured by three different test principles. Sevendifferent w/c...
Technical Report
Full-text available
This report is part of a series of reports generated in the research project HETEK headed by tha Danish Road Directorate. The present subtask is concerning chloride transport into concrete and this report presents the state of the art on that topic. The report forms the basis for the further research and development in the subtask, Mathematical mod...
Conference Paper
Full-text available
Chloride threshold concentrations in concrete are measured by use of a standard test unit with 20 embedded steel electrodes, which are potentiostatically held at different fixed potentials. The test unit is exposed to chloride from one side. Initiation of corrosion of each electrode is detected by a sudden rise in anodic current. The chloride conce...
Conference Paper
Full-text available
An assessment of critical chloride concentrations for the onset of active reinforcement corrosion in uncarbonated concrete was undertaken from an engineering point of view, based on experimental data from laboratory and field testing in Sweden. Factors affecting the critical chloride concentration were discussed. Simplified presentations of the cri...
Technical Report
Full-text available
The Danish test method APM 302 has been evaluated at a Nordic round robin test between three laboratories. APM 302 is developed by the AEClaboratory and describes a procedure to measure chloride penetration by non-steady state diffusion into concrete and other cement-based materials. The test is performed by exposing a water-saturated sample in a s...
Conference Paper
Full-text available
In the recent years chloride induced corrosion of rebars in concrete has resulted in lots of costly repairworks. In the light of this and on request from various clients AEC since 1985 has worked on the development of a testing method - APM 302, which is able to measure the resistance of concrete to penetration of chlorides and anable a qualified g...

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