Short-Term Behavior of Slag Concretes Exposed to a Real In Situ Mediterranean Climate Environment

Ortega, José Marcos; Sánchez, Isidro; Cabeza, M.; Climent, M.Á.

doi:10.3390/ma10080915

Cited by 9 publications

(16 citation statements)

References 27 publications

(64 reference statements)

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“…In this regard, there are not too many experimental works where slag and fly ash cement-based materials had been hardened under real in-situ environments [12,13,[19][20][21][22][23][24][25][26] and considering their results, those materials showed different behaviour as a function of the climate characteristics of the place in which the specimens were located, although the majority of them coincide in the fact that the use of both additions is particularly adequate for marine structures [13,23,27,28].…”

Section: Introductionmentioning

confidence: 99%

Effects of Environment in the Microstructure and Properties of Sustainable Mortars with Fly Ash and Slag after a 5-Year Exposure Period

et al. 2018

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Nowadays, getting a more environmentally sustainable cement production is one of the main goals of the cement industry. In this regard, the use of active additions, like fly ash and ground granulated blast-furnace slag, has become very popular. The behaviour, in the short-term, of cement-based materials with those additions is well-known when their hardening is produced under optimum conditions. However, real structures are exposed to different environments during long periods, which could affect the development of microstructures and the service properties of cementitious materials. The objective of this work is to analyse the effects in the long-term (up to 5 years approximately) produced by the exposure to different non-optimum laboratory conditions in the microstructure, mechanical and durability properties of mortars made with slag and fly ash commercial cements. Their performance was compared to that observed for ordinary Portland cement (OPC) mortars. The microstructure has been analysed using mercury intrusion porosimetry. The effective porosity, the capillary suction coefficient, the chloride migration coefficient and mechanical strengths were analysed too. According to the results, mortars prepared using slag and fly ash sustainable commercial cements, exposed to non-optimum conditions, show a good performance after 5-years hardening period, similar or even better than OPC mortars.

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Section: Introductionmentioning

confidence: 99%

Effects of Environment in the Microstructure and Properties of Sustainable Mortars with Fly Ash and Slag after a 5-Year Exposure Period

et al. 2018

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“…The evolution of the microstructure, durability and mechanical properties of those sustainable cementitious materials were analysed until 180 days of exposure to the marine conditions. Considering the results obtained [60,72], the studied materials showed good service properties in the short-term (180 days), in comparison with ordinary Portland cement ones.…”

Section: Present and Future Of Caisson Breakwaters Technology: An Impmentioning

confidence: 81%

“…In relation to the exposure of eco-friendly cement-based materials to a real marine Mediterranean climate environment, Ortega et al [60,72] studied the behaviour of those materials prepared with commercial cements with high volumes of ground granulated blast-furnace slag and fly ash. They were placed in several locations along the coast of Alicante province (Spain), one of them also involving a high presence of CO 2 .…”

Section: Present and Future Of Caisson Breakwaters Technology: An Impmentioning

confidence: 99%

From Julius Caesar to Sustainable Composite Materials: A Passage through Port Caisson Technology

et al. 2018

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Abstract:The breakwater construction technique using floating concrete caissons is well-known nowadays as a widespread system. Yet do we really know its origin? Since Julius Caesar used this technology in Brindisi (Italy) up to the Normandy landings in June 1944, not only has this technology been developed, but it has been a key item in several moments in history. Its development has almost always been driven by military requirements. The greatest changes have not been conceptual but point occurring, backed by the materials used. Parallelisms can be clearly seen in each new stage: timber, opus caementitium (Roman concrete), iron and concrete . . . However, nowadays, achieving a more sustainable world constitutes a major challenge, to which the construction of caissons breakwaters must contribute as a field of application of new eco-friendly materials. This research work provides a general overview from the origins of caissons until our time. It will make better known the changes that took place in the system and their adaptation to new materials, and will help in clarifying the future in developing technology towards composite sustainable materials and special concrete. If we understand the past, it will be easier to define the future.

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“…Corrosion induced by carbonation is the primary reason for the deterioration of concrete structures exposure to an atmospheric environment [1][2][3][4][5] and non-optimum environments [6][7][8]. The pH of Portland cement concrete is usually in the range of 12.5 to 13.8 [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Carbonation depth is usually measured with a phenolphthalein indicator, which is a fast and convenient method [2]. However, the indicator only indicates a pH range of 8.0-9.8 [17].…”

Section: Introductionmentioning

confidence: 99%

Pore Solution pH for the Corrosion Initiation of Rebars Embedded in Concrete under a Long-Term Natural Carbonation Reaction

Liu¹,

Niu²,

Li³

et al. 2018

Applied Sciences

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Featured Application: The work presented in this paper is suitable for application to the evaluation of existing reinforced concrete structures in buildings, brides, and tunnels.Abstract: This paper presents an in-situ inspection and experimental investigation on the pore solution pH of concrete cover for the corrosion initiation of rebars under a long-term natural carbonation reaction. A 77-year-old steel mill was inspected, and 35 concrete column cover samples were collected to test the pH of the pore solution and phase compositions layer by layer. The variation in pH and phase compositions of the concrete along the cover depth was studied. The in-situ inspection results indicate that the rebar embedded in concrete had begun to corrode when the carbonation depth was almost less than one-third of the cover depth. The corrosion initiation of rebars embedded in concrete can occur when the pH is between 11.3 and 12.1. The pore solution pH test results and X-ray diffraction (XRD) analysis indicated that there is a semi-carbonated zone between the fully carbonated zone and the rebar. The pH of a fully carbonated zone is in a range of 8.0-9.5, and the pH of a semi-carbonated zone is between 9.5 and 12.1.

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Short-Term Behavior of Slag Concretes Exposed to a Real In Situ Mediterranean Climate Environment

Cited by 9 publications

References 27 publications

Effects of Environment in the Microstructure and Properties of Sustainable Mortars with Fly Ash and Slag after a 5-Year Exposure Period

Effects of Environment in the Microstructure and Properties of Sustainable Mortars with Fly Ash and Slag after a 5-Year Exposure Period

From Julius Caesar to Sustainable Composite Materials: A Passage through Port Caisson Technology

Pore Solution pH for the Corrosion Initiation of Rebars Embedded in Concrete under a Long-Term Natural Carbonation Reaction

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