Influence of using slag cement on the microstructure and durability related properties of cement grouts for micropiles

Ortega, José Marcos; Albaladejo, Arturo; Pastor, José Luis; Sánchez, Isidro; Climent, M.Á.

doi:10.1016/j.conbuildmat.2012.08.036

Cited by 27 publications

(26 citation statements)

References 20 publications

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“…This would agree with several studies [12,15,23,24], which have pointed out that using slag and fly ash cements brings a noticeable improvement in chloride ingress resistance. Firstly, this could be explained in relation to the higher refinement of pore network provided by fly ash and slag in comparison with pure clinker [7][8][9]14,15]. On the other hand, this good resistance of fly ash and slag mortars to chloride ingress since very early ages and its maintenance when the hardening was produced under non-optimum environments, which produced a lower microstructure refinement in the long-term compared to an optimum condition, could also be justified as a consequence of the higher chloride binding capacity of slag and fly ash cements, compared to OPC.…”

Section: Forced Chloride Migration Resultsmentioning

confidence: 99%

“…Before the test, the specimens were subjected to a pre-conditioning procedure, which firstly consisted of a complete drying in oven at 105 • C for 12 h. After that and up to starting the test (minimum 12 h), the specimens were maintained in a hermetic desiccator containing silica gel [14,44,45]. This pre-conditioning procedure was used, instead of other recommended protocols [46], in order to avoid too long pre-conditioning periods and the eventual need of contact of some of the mortar samples with liquid water.…”

Section: Capillary Absorption Testmentioning

confidence: 99%

“…On the other hand, the fly ash has pozzolanic activity, which means that it reacts with portlandite produced along the clinker hydration, giving rise to the formation of additional hydrated products, thus increasing the refinement of the pore network of mortars and concretes [9][10][11]. The abovementioned pore refinement produced by both additions improves the performance of cementitious materials, for example their chloride ingress resistance [12][13][14][15][16][17] and their permeability [18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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: Forced Chloride Migration Resultsmentioning

confidence: 99%

Section: Capillary Absorption Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…After the hole is cleaned, stones or fine stone silicon of certain specifications are placed into the hole, and the water in the hole is replaced by cement grout to form pressure grouting (this process is not suitable for putting fine stone silicon), thereby forming a grouting pile with diameters of similar or varying sizes. Owing to the permeation of grout, soil among the piles will be improved in root pile reinforcement; the foundation is referred to as the "composite foundation" of improved soil and root piles [23][24].…”

Section: Reinforcement Mechanisms For Tunnelmentioning

confidence: 99%

Development and Prospect of Root Piles in Tunnel Foundation Reinforcement

Ding¹,

Su²,

Lai³

et al. 2017

CEJ

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Over the past couple of decades, root piles as the new tool for addressing a number of tough problems have been gaining a continually increasing interest in tunnel, especially for complex geological conditions. Therefore, in order to promote the development and application of root piles in tunnel engineering, this paper systematically sorts out the research status and development prospect of root piles from the application in foundation underpinning to reinforcement of tunnel foundation. Firstly, the type and development process of root piles are discussed. Secondly, the reinforcement mechanism of the root piles in the tunnel base is refined and combed: the reinforcement mechanism analysis focuses on frictional resistance of soil around pile, soil among piles, and piles. Thirdly, the calculation method of reinforced tunnel foundation is studied from the bearing of vertical load, horizontal load and pile reinforcement design. And through the engineering case, the paper illustrates the reinforcement effect of the root pile in ensuring the stability of the tunnel and the concrete process of the root piles in the tunnel construction. Finally, the problem and development prospect of root piles are discussed, so as to provide new perspectives and fundamental data for the research on tunnel engineering.

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“…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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Influence of using slag cement on the microstructure and durability related properties of cement grouts for micropiles

Cited by 27 publications

References 20 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

Development and Prospect of Root Piles in Tunnel Foundation Reinforcement

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

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