Fly ash effects: I. The morphological effect of fly ash

Wang, Aiqin; Zhang, Chengzhi; Sun, Wei

doi:10.1016/s0008-8846(03)00217-5

Cited by 175 publications

(81 citation statements)

References 4 publications

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“…Blast-furnace slag has hydraulic properties, therefore it would start to react since the setting moment, while fly ash has pozzolanic properties, so their particles need the presence of portlandite, produced during clinker hydration, for starting to react (7). The good behaviour of cements which incorporate these additions is due to the products produced during the abovementioned reactions, which bring with them an important refinement of mortars and concretes microstructure (1,5,8).…”

Section: Introductionmentioning

confidence: 99%

“…La escoria de alto horno posee propiedades hidráulicas, por lo que empezaría a reaccionar desde el momento del amasado, mientras que la ceniza volante posee propiedades puzolánicas, así que sus partículas necesitan la presencia de portlandita, formada en la hidratación del clínker, para comenzar a reaccionar (7). El buen comportamiento de los cementos que incorporan estas adiciones, se debe a que los productos formados en las reacciones anteriores, traen consigo un mayor refinamiento de la microestructura de morteros y hormigones (1,5,8).…”

Section: Introductionunclassified

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Influencia de diferentes condiciones de curado en la estructura porosa y en las propiedades a edades tempranas de morteros que contienen ceniza volante y escoria de alto horno

Ortega¹,

Sánchez²,

Climent³

2012

Mater. construcc.

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In this work, the evolution of the microstructure, durability properties and mechanical strength of mortars made with commercial cements, which contain fly ash (between 21% and 35%) and ground granulated blast-furnace slag (between 66% and 80%), were studied. These mortars were exposed to three different environments during their hardening, an optimum laboratory condition, and two environments representing a mild Atlantic climate and a Mediterranean climate, respectively. As a reference, ordinary Portland cement mortars were also tested. The microstructure was characterized using mercury intrusion porosimetry. Regarding durability, the capillary suction coefficient and non-steady-state chloride migration coefficient were determined. Compressive strength was studied too. The tests were performed at 7, 28 and 90 days. The main conclusion of this work is that cements with slag and fly ash hardened under environmental conditions of Atlantic and Mediterranean climates, can develop good service properties after three months of hardening.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionunclassified

Influencia de diferentes condiciones de curado en la estructura porosa y en las propiedades a edades tempranas de morteros que contienen ceniza volante y escoria de alto horno

Ortega¹,

Sánchez²,

Climent³

2012

Mater. construcc.

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“…Both processes are related and depend on the fly-ash content. As shown by Wang et al [28], if enough portlandite is present the hydration of fly ash can continué. This explains why samples made from CEM II/B and CEM IV show higher long-term compressive strengths.…”

Section: Evolution Of Samples Immersed In Watermentioning

confidence: 91%

Assessment of mortar evolution in pig slurry by mechanical and ultrasonic measurements

Segura

Sánchez

Moragues

et al. 2010

Construction and Building Materials

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Keywords:Ultrasonic velocity Characterization Degradation Fly ash Mortar Pig slurry This work presents the results obtained in a long-term experiment focused on the study of the evolution of cementitious materials immersed in pig slurry at real conditions. Cement mortars were made with four different cement types and immersed in pig slurry for 48 months. Furthermore, to sepárate puré hydration process from pig slurry effect, mortar samples were immersed in water for 12 months at laboratory conditions. Compressive strength, X-ray diffraction and ultrasonic measurements were made in all samples. Ultrasonic measurements were made from ultrasonic images obtained from automatic ultrasonic inspections. Use of ultrasonic images has allowed the extraction of information about the state of the studied materials. An empirical relationship between ultrasonic velocity and compressive strength has been obtained and the long-term effect of pig slurry on cementitious materials has been determined.

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“…In the first stage, the test cylinders were exposed to an atmosphere of 100% CO 2 and between 60% and 70% relative humidity (RH) in order to favor the process and conditions of carbonation equipment. After 50 days in the carbonation chamber, the test cylinders were stored in laboratory humidity conditions (50-60% RH) and ambient temperature (20)(21)(22)(23)(24)(25) • C) in order to monitor the evolution of the corrosion rates in ambient atmosphere with higher oxygen concentrations; this was the second level. At the final stage, a desiccator was used for the test cylinder having an atmosphere of 100% RH for the purpose of avoiding the resistive control of corrosion attack by the lack of humidity (a condition that can occur with RH between 50% and 60%).…”

Section: Exposure Conditionsmentioning

confidence: 99%

“…However, it has been reported that, as the fly ash content increases, the development of pozzolanic reactions decreases because there is not enough calcium hydroxide in the system to react with all of the available fly ash [21], which in turn leads to the development of a porous microstructure. It is thus important to define the most proper usage of fly ash in each case.…”

Section: Introductionmentioning

confidence: 99%

Improving Sustainability through Corrosion Resistance of Reinforced Concrete by Using a Manufactured Blended Cement and Fly Ash

et al. 2018

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Abstract:The objective of this paper is to report the improvement of sustainability through the increase of reinforced concrete corrosion resistance by using a blended cement and fly ash. Different reinforced concrete mixtures were prepared with partial substitution of a manufactured blended cement with fly ash from a thermal power plant in Andorra (Teruel, Spain). These mixtures were manufactured using three different water/cement ratios (0.46, 0.59, and 0.70) and three substitution percentages of cement by fly ash (0%, 25%, and 50%). The test cylinders underwent an accelerated carbonation process and exposure to different chloride levels, with the aim of characterizing the corrosion level of the different mixtures. The addition of local FA matched or even improved the resistance of the control mixture against carbonation and chlorides.

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Fly ash effects: I. The morphological effect of fly ash

Cited by 175 publications

References 4 publications

Influencia de diferentes condiciones de curado en la estructura porosa y en las propiedades a edades tempranas de morteros que contienen ceniza volante y escoria de alto horno

Influencia de diferentes condiciones de curado en la estructura porosa y en las propiedades a edades tempranas de morteros que contienen ceniza volante y escoria de alto horno

Assessment of mortar evolution in pig slurry by mechanical and ultrasonic measurements

Improving Sustainability through Corrosion Resistance of Reinforced Concrete by Using a Manufactured Blended Cement and Fly Ash

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