Long-Term Behaviour of Fly Ash and Slag Cement Grouts for Micropiles Exposed to a Sulphate Aggressive Medium

Ortega, José Marcos; Esteban, M. Dolores; Rodríguez, Raúl Rubén; Pastor, José Luis; Ibanco, Francisco José; Sánchez, Isidro; Climent, M.Á.

doi:10.3390/ma10060598

Cited by 35 publications

(47 citation statements)

References 46 publications

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“…Cylindrical (10 cm diameter and 15 cm height) and prismatic (4 cm × 4 cm × 16 cm) specimens were made. The samples were cured for 7 days in a temperature and humidity controlled chamber at 20 • C and 95% relative humidity (RH) [33,34]. Following this period they were de-molded, cut to shape as required, and introduced into the corresponding sulfate solution.…”

Section: Sample Preparation and Curingmentioning

confidence: 99%

Short-Term Performance of Sustainable Silica Fume Mortars Exposed to Sulfate Attack

Ortega

Esteban

Williams³

et al. 2018

Sustainability

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Nowadays, the reuse of wastes is essential in order to reach a more sustainable environment. The cement production results in CO2 emissions which significantly contribute to anthropogenic greenhouse gas emissions. One way to reduce them is by partially replacing clinker by additions, such as silica fumes or other wastes. On the other hand, the pore structure of cementitious materials has a direct influence on their service properties. One of the most popular techniques for characterizing the microstructure of those materials is mercury intrusion porosimetry. In this work, this technique has been used for studying the evolution of the pore network of mortars with different percentages of silica fume (until 10%), which were exposed to aggressive sodium and magnesium sulfate solutions up to 90 days. Between the results of this technique, intrusion-extrusion curves and logarithms of differential intrusion volume versus pore size curves were studied. This characterization of the pore network of mortars has been complemented with the study of their compressive strength and their steady-state ionic diffusion coefficient obtained from samples’ resistivity. Generally, silica fume mortars showed different performance depending on the aggressive condition, although the greatest deleterious effects were observed in the medium with presence of both magnesium and sodium sulfates.

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Section: Sample Preparation and Curingmentioning

confidence: 99%

Short-Term Performance of Sustainable Silica Fume Mortars Exposed to Sulfate Attack

Ortega

Esteban

Williams³

et al. 2018

Sustainability

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“…Among the different ways to reach this aim, the use of additions as clinker replacement has lastly become increasingly common [1][2][3][4][5][6], providing benefits such as the lessening of CO 2 emissions and the reduction of energy consumption throughout the cement manufacture, as well as the reuse of wastes coming from other industrial sectors, which would also help to solve their storage problem.…”

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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“…Among those supplementary cementitious materials, the most popular additions are ground granulated blast-furnace slag, fly ash and silica fume [50][51][52][53]. Several studies [50][51][52][53][54] have noted that the incorporation of these materials entails a better performance of concrete in comparison with those prepared with plain ordinary Portland cement (OPC).…”

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

confidence: 99%

“…Several studies [50][51][52][53][54] have noted that the incorporation of these materials entails a better performance of concrete in comparison with those prepared with plain ordinary Portland cement (OPC). This good behaviour is related to the slag hydration and fly ash and silica fume pozzolanic reactions, whose products are additional CSH phases, which produce a more refined pore network [50,55,56], as well as an improvement of the service properties of cement-based materials [57,58], most of them related to marine environment, such as permeability [54] and resistance to sulphate attack [59,60] and chloride ingress [57,61,62].…”

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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Long-Term Behaviour of Fly Ash and Slag Cement Grouts for Micropiles Exposed to a Sulphate Aggressive Medium

Cited by 35 publications

References 46 publications

Short-Term Performance of Sustainable Silica Fume Mortars Exposed to Sulfate Attack

Short-Term Performance of Sustainable Silica Fume Mortars Exposed to Sulfate Attack

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

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