A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Performance of rapid-repair concrete in an aggressive marine environment
HighlightsThe durability performance of ettringite-based binders in terms of chloride penetration and corrosion is presented.Calcium sulfoalumiante cement based binders result in an increased corrosion rate compared to other ettringite-based binders.The abundance of ettringite results in a decrease in chloride binding due to the reduced ability of Friedel’s salt to form.The newly developed ettringite-based binder results in a corrosion performance similar to Portland cement.
AbstractRapid-repair concretes are currently used to repair structures such as bridge decks, substructure elements on bridges (e.g. piers and columns), pavements, and components of buildings. Rapid-repair concretes must not only achieve a high-early strength in a short period of time (e.g. 20MPa in 3h) but must also survive for the remaining life of the structure. One way of achieving high early-age strength is the use of ettringite-based cements; in these cements early strength is attributed to the rapid formation of ettringite by incorporating, in the binder, calcium sulfo-aluminate cement or a combination of calcium aluminate cement and calcium sulfate. Although research has proven that early-strength is achievable, there exist limited published durability data for these systems. This paper presents data on the performance of a number of rapid-repair materials placed at the high-tide level of a marine exposure site (Treat Island, Maine, USA) which experiences approximately 100 freeze-thaw cycles a year making it one of the harshest environments for concrete in the world. A number of concretes were studied including an ordinary Portland cement (PC) and a high-early strength Portland cement (HEPC) as references, PC accelerated by calcium aluminate cement (CAC) with calcium sulfate (C$), PC accelerated by calcium sulfo-aluminate (C$A(2)-PC), and calcium sulfo-aluminate belite (C$A(1)-C2S) cement on its own. Reinforced concrete specimens were monitored on a yearly basis to evaluate the corrosion condition of the steel. After three years of exposure, reinforced concrete beams from each mix were returned to the laboratory to determine chloride profiles, and to conduct X-ray diffraction (XRD) and microstructural investigation using scanning electron microscopy (SEM) coupled with energy dispersive X-ray (EDS) analysis.
Performance of rapid-repair concrete in an aggressive marine environment
HighlightsThe durability performance of ettringite-based binders in terms of chloride penetration and corrosion is presented.Calcium sulfoalumiante cement based binders result in an increased corrosion rate compared to other ettringite-based binders.The abundance of ettringite results in a decrease in chloride binding due to the reduced ability of Friedel’s salt to form.The newly developed ettringite-based binder results in a corrosion performance similar to Portland cement.
AbstractRapid-repair concretes are currently used to repair structures such as bridge decks, substructure elements on bridges (e.g. piers and columns), pavements, and components of buildings. Rapid-repair concretes must not only achieve a high-early strength in a short period of time (e.g. 20MPa in 3h) but must also survive for the remaining life of the structure. One way of achieving high early-age strength is the use of ettringite-based cements; in these cements early strength is attributed to the rapid formation of ettringite by incorporating, in the binder, calcium sulfo-aluminate cement or a combination of calcium aluminate cement and calcium sulfate. Although research has proven that early-strength is achievable, there exist limited published durability data for these systems. This paper presents data on the performance of a number of rapid-repair materials placed at the high-tide level of a marine exposure site (Treat Island, Maine, USA) which experiences approximately 100 freeze-thaw cycles a year making it one of the harshest environments for concrete in the world. A number of concretes were studied including an ordinary Portland cement (PC) and a high-early strength Portland cement (HEPC) as references, PC accelerated by calcium aluminate cement (CAC) with calcium sulfate (C$), PC accelerated by calcium sulfo-aluminate (C$A(2)-PC), and calcium sulfo-aluminate belite (C$A(1)-C2S) cement on its own. Reinforced concrete specimens were monitored on a yearly basis to evaluate the corrosion condition of the steel. After three years of exposure, reinforced concrete beams from each mix were returned to the laboratory to determine chloride profiles, and to conduct X-ray diffraction (XRD) and microstructural investigation using scanning electron microscopy (SEM) coupled with energy dispersive X-ray (EDS) analysis.
Performance of rapid-repair concrete in an aggressive marine environment
Moffatt, E.G. (author) / Thomas, M.D.A. (author)
Construction and Building Materials ; 132 ; 478-486
2016-12-02
9 pages
Article (Journal)
Electronic Resource
English
Performance of rapid-repair concrete in an aggressive marine environment
| British Library Online Contents | 2017
Performance of rapid-repair concrete in an aggressive marine environment
| Online Contents | 2017
Performance of Concrete Structures in Aggressive Marine Environment
| British Library Conference Proceedings | 1997
Performance of Concrete Structures in Aggressive Marine Environment - An Experimental Simulation
| British Library Conference Proceedings | 1997
Performance of Blast Furnace Slag Cement Concrete in Simulated Aggressive Marine Environment
| British Library Conference Proceedings | 1998