Jonny Nilimaa
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View article: Snow effects on brash ice and level ice growth
Snow effects on brash ice and level ice growth Open
Brash ice formation and accumulation occur at a faster rate in ship channels, harbours and turning areas compared to the surrounding level ice. Accurate prediction of brash ice thickness plays an important role in addressing operational ch…
View article: Formwork Engineering for Sustainable Concrete Construction
Formwork Engineering for Sustainable Concrete Construction Open
This study provides a comprehensive review of the engineering challenges of formwork in concrete construction. The paper investigates different formwork systems, their design based on form pressure, and the difficulties of form stripping. …
View article: New Examination Approach for Real-World Creativity and Problem-Solving Skills in Mathematics
New Examination Approach for Real-World Creativity and Problem-Solving Skills in Mathematics Open
This paper presents a new and innovative examination method designed to foster creativity, problem-solving, and collaboration in mathematics education. Traditional assessment practices often focus on rote memorization and fail to engage st…
View article: Observations of Snow–Slush–Snow Ice Transformation and Properties of Brash Ice in Ship Channels
Observations of Snow–Slush–Snow Ice Transformation and Properties of Brash Ice in Ship Channels Open
The thickness and properties of brash ice are usually compared with the properties of the surrounding level ice. The differences between these ice types are important to understand since the consolidated brash ice layer is typically assume…
View article: An Overview of Smart Materials and Technologies for Concrete Construction in Cold Weather
An Overview of Smart Materials and Technologies for Concrete Construction in Cold Weather Open
Cold weather conditions pose significant challenges to the performance and durability of concrete materials, construction processes, and structures. This paper aims to provide a comprehensive overview of the material-related challenges in …
View article: Smart materials and technologies for sustainable concrete construction
Smart materials and technologies for sustainable concrete construction Open
This paper presents a comprehensive review of current trends and opportunities for sustainable concrete construction, emphasizing the importance of adopting eco-friendly practices to mitigate the industry's environmental impact. Green conc…
View article: Material and Environmental Aspects of Concrete Flooring in Cold Climate
Material and Environmental Aspects of Concrete Flooring in Cold Climate Open
Dehydration of concrete floor slabs is a critical step to ensure that the flooring material adheres properly and that there is no moisture-related damage to the floor after installation. Dehydration in a cold climate is often a slow proces…
View article: A Direct Tensile Strength Testing Method for Concrete from Existing Structures
A Direct Tensile Strength Testing Method for Concrete from Existing Structures Open
Tensile strength is a crucial property for the function, safety and durability of all concrete structures. The general procedure to assess the tensile properties of concrete from existing structures is to perform indirect tests and predict…
View article: Experimental based assessment of formwork pressure theoretical design models for self-compacting concrete
Experimental based assessment of formwork pressure theoretical design models for self-compacting concrete Open
Self-Compacting Concrete (SCC) offers favourable properties which help accelerate the casting time, especially in congested reinforced structures but when casting with SCC uncertainty remains a challenge on the behaviour of its formwork pr…
View article: The Impact of Different Parameters on the Formwork Pressure Exerted by Self-Compacting Concrete
The Impact of Different Parameters on the Formwork Pressure Exerted by Self-Compacting Concrete Open
Despite the advantageous benefits offered by self-compacting concrete, its uses are still limited due to the high pressure exerted on the formwork. Different parameters, such as those related to concrete mix design, the properties of newly…
View article: Lateral Formwork Pressure for Self-Compacting Concrete—A Review of Prediction Models and Monitoring Technologies
Lateral Formwork Pressure for Self-Compacting Concrete—A Review of Prediction Models and Monitoring Technologies Open
The maximum amount of lateral formwork pressure exerted by self-compacting concrete is essential to design a technically correct, cost-effective, safe, and robust formwork. A common practice of designing formwork is primarily based on usin…
View article: Full scale test of a PC bridge to calibrate assessment methods
Full scale test of a PC bridge to calibrate assessment methods Open
In this paper, experiences on the development of an assessment method for existing bridges are presented. The method is calibrated using the results of full-scale testing to failure of a prestressed bridge in Sweden. To evaluate the key pa…
View article: Concrete Construction: How to Explore Environmental and Economic Sustainability in Cold Climates
Concrete Construction: How to Explore Environmental and Economic Sustainability in Cold Climates Open
In many cold regions around the world, such as northern China and the Nordic countries, on-site concrete is often cured in cold weather conditions. To protect the concrete from freezing or excessively long maturation during the hardening p…
View article: Testing to Failure of a 55-year-old Prestressed Concrete Bridge in Kiruna : Bending, Shear and Punching of Girders and Slab. Fracture Properties of Materials. Test Results, Modelling and Assessment. Final Report BBT 2017-030
Testing to Failure of a 55-year-old Prestressed Concrete Bridge in Kiruna : Bending, Shear and Punching of Girders and Slab. Fracture Properties of Materials. Test Results, Modelling and Assessment. Final Report BBT 2017-030 Open
Results are presented from the testing to failure of a 55-year-old prestressed concrete bridge with five continuous spans and a total length of 121.5 m. The bridge was situated in Kiruna in northern Sweden. Results are given from load, def…
View article: Load-testing used for quality control of bridges
Load-testing used for quality control of bridges Open
Load testing is a way to control the capacity and function of a bridge. Methods and recommendations for load testing are described and examples are given form tests carried out. In order not to damage the bridge being tested, the load must…
View article: Assessment of concrete bridges - Structural capacity : Experiences from full-scale testing to failure of a bridge in Kiruna
Assessment of concrete bridges - Structural capacity : Experiences from full-scale testing to failure of a bridge in Kiruna Open
To calibrate methods for condition assessment of prestressed concrete (PC) bridges, tests were carried out on a 55 year old five-span bridge with a length of 121 m in Kiruna in northern Sweden. Both non-destructive and destructive full-sca…
View article: Thermal Crack Risk of Concrete Structures : Evaluation of Theoretical Models for Tunnels and Bridges
Thermal Crack Risk of Concrete Structures : Evaluation of Theoretical Models for Tunnels and Bridges Open
An approach for thermal crack risk estimations was introduced in the Swedish design guidelines BRO 94. The cracking occurs during the early hardening process because of the exothermic reactions between water and cement and often result in …
View article: Validation of the Swedish Crack Risk Estimation Models
Validation of the Swedish Crack Risk Estimation Models Open
Thermal cracking may occur during the early hardening process of concrete as a result of the exothermic reactions between water and cement. An approach for thermal crack risk estimation and prevention was introduced in the Swedish design g…
View article: Assessment of concrete bridges - Prestress forces : Experiences from full-scale testing to failure of a bridge in Kiruna
Assessment of concrete bridges - Prestress forces : Experiences from full-scale testing to failure of a bridge in Kiruna Open
To calibrate methods for condition assessment of prestressed concrete (PC) bridges, tests were carried out on a 55 year old five-span bridge with a length of 121 m in Kiruna in northern Sweden. Both non-destructive and destructive full-sca…
View article: New technologies to extend the life of elderly rail infrastructure : Deliverable 1.3 in MAINLINE - a project within the EC 7th Framework Programme
New technologies to extend the life of elderly rail infrastructure : Deliverable 1.3 in MAINLINE - a project within the EC 7th Framework Programme Open
There are many traditional technologies available to extend the life of elderly rail infrastructure, some of which are being improved or developed, whilst new technologies continue to emerge.In two earlier reports a benchmark of new techno…
View article: Concrete Bridges : Improved Load Capacity
Concrete Bridges : Improved Load Capacity Open
There are many beautiful old structures around the world, some of which were designed for completely different purposes than their current applications. For example, Swedish railway bridges were only designed to carry axle loads up to 200 …