Assessment of hardened characteristics of raw fly ash blended self-compacting concrete

Mahalingam, B.; Nagamani, K.; Kannan, L.S.; Haneefa, K. Mohammed; Bahurudeen, A.

doi:10.1016/j.pisc.2016.06.066

Cited by 20 publications

(9 citation statements)

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“…10 [40], the split tensile strength in average was found to be 3.8 MPa. Thus, it had been found that the tensile strength after conducting split tensile test was nearly around 4MPa [1].…”

Section: B Split Tensile Strengthmentioning

confidence: 99%

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Rheodynamic Concrete as a Progressive Viability in the field of Concrete Technology

Hooda¹,

Singh²

2020

IJEAT

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The most important material which is used for the construction of any concrete structure is concrete itself. It is considered to be as a versatile construction material as its properties can be changed by various means, with the help of different elements and as and when required. Rheodynamic Concrete or Self-Compacting Concrete is a special form of concrete which can easily flow into any kind of formwork uniformly, without facing the problem of bleeding and segregation, gives a better finish, has a great characteristic of placement, requires no vibration, and thus gives a safe working environment. Due to a number of merits, this type of concrete had becoming popular in the construction work. Simultaneously, the big industries across the world are producing the by products such as fly ash, rice husk ash, etc. Thus, this paper represents a review, which is done to incorporate these wastes by – products in Self-Compacting Concrete and observe, how the different properties of the same has been modified effectively and efficiently.

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“…10 [40], the split tensile strength in average was found to be 3.8 MPa. Thus, it had been found that the tensile strength after conducting split tensile test was nearly around 4MPa [1].…”

Section: B Split Tensile Strengthmentioning

confidence: 99%

“…The study that is conducted by B. Mahalingam et al [1] include class F Fly Ash conforming to IS: 3812-2003 and OPC of grade 53, conforming to IS 12269: 2008. In his study, SCC mixed was designed with 450 kg/m3 of binder content, with the two different level of replacements with cement {30% and 40%}.…”

Section: A Compressive Strengthmentioning

confidence: 99%

Rheodynamic Concrete as a Progressive Viability in the field of Concrete Technology

Hooda¹,

Singh²

2020

IJEAT

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“…Este subproducto experimenta reacciones puzolánicas y de hidratación [11]. La FA ha sido empleada en el CAC en cantidades que van desde 10% al 60% en reemplazo del OPC, sin embargo, aumentar demasiado su contenido reduce la resistencia a la compresión [11,[16][17][18]. Por otra parte, en cantidades inferiores al 35%, dependiendo de las características de la ceniza volante, pueden mejorar la trabajabilidad, capacidad de paso y de relleno [19].…”

Section: Hac2018 | V Congreso Iberoamericano De Hormigón Autocompactaunclassified

Concreto autocompactante con materiales cementicios suplementarios de Colombia

Urrego

Delvasto

2018

Libro De Comunicaciones / Livro Das Comunicações

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RESUMENEl concreto autocompactante (CAC) es un tipo de hormigón o concreto especial, que por sus características reológicas es considerado uno de los grandes desarrollos tecnológicos en la industria del concreto, con un consumo creciente en la industria de la construcción. Este artículo contiene resultados de investigaciones realizadas por el Grupo Materiales Compuestos (GMC) sobre el CAC empleando diferentes adiciones disponibles en Colombia. Se han estudiado adiciones de subproductos industriales como la ceniza volante (FA), escoria de carbón (E), lodo calcáreo (LC) y residuos de mampostería (RM) proveniente de los residuos construcción y demolición (RCD), y otros materiales como las puzolanas naturales o rellenos como la caliza molida (LP), material volcánico del Puracé (MVP) y material volcánico de Tolima (MVT). Estos materiales se incorporaron en la preparación de concretos autocompactantes para su posterior evaluación reológica en estado fresco y caracterización en estado endurecido. El acondicionamiento reológico se evaluó mediante técnicas como el embudo en V, caja en L y flujo de asentamiento con cono de Abrams. Adicionalmente se evaluaron propiedades mecánicas como la resistencia a la compresión y la tracción indirecta. Para ello se analizaron el comportamiento de un total de 23 mezclas de CAC con 7 adiciones distintas donde los flujos de asentamiento presentaron diámetros dentro de un rango de 520 mm -750 mm, los tiempos en la prueba de fluidez en el embudo en V estuvieron en un rango entre 4 y 20 segundos, y los resultados en la relación de bloqueo (H2/H1) de las diferentes mezclas usando la caja en L estuvieron en un rango entre 0,68 y 1. La resistencia a la compresión de la mezcla con mayor resistencia, 43,4 MPa a los 28 días de curado bajo agua, la reportó un CAC con 35% de FA (CAC 65_FA-35) seguida de la mezcla de CAC con 20% de escoria (CAC 80_E-20) con 41,3 MPa. Se concluyó que los materiales investigados sí tienen potencial para ser adicionados en los CAC y obtener propiedades adecuadas en las mezclas, tanto en estado fresco como endurecido. PALABRAS CLAVES:Concreto autocompactante, reología, puzolanas, residuos de construcción y demolición, cenizas volantes, harina calcárea. 505

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“…A large amount of low-calcium fly ash is produced in China, and its quality is unstable. In order to maximize its utilization in practical engineering, in the past several years, a number of studies have been carried out including investigations into the morphological, micro-aggregate and pozzolanic activity effects of fly ash in cement-based materials [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Action Time-Effect and Mechanism of Low-Calcium Fly Ash in Cement-Based Composites

et al. 2021

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This study was conducted in order to investigate when low-calcium fly ash plays a physical or chemical effect and what is the chemical effect proportion of low-calcium fly ash. Two types of low-calcium fly ash and quartz powder, with similar fineness as active and inert admixtures, were used as materials in this study. Under different water/binder ratios and hydration ages, the effects of the different types of admixtures and their dosages on the flexural and compressive strength of the composites were studied. X-ray diffraction (XRD), scanning electron microscopy (SEM) and nitrogen adsorption methods, in addition to an assessment of the degree of hydration of the fly ash, were employed to observe the hydration products at different ages, the microstructures of the hydration products, as well as their surface areas and pore size distributions. The results show that during the hydration period of 28 days, the low-calcium fly ash has a micro-aggregate filling physical effect. However, after 56 days, the hydration degree of fly ash begins to exceed 1%. This illustrates that the low-calcium fly ash has both the pozzolanic activity effect and micro-aggregate filling effect. In contrast, the low-calcium fly ash hydrated for 90 days is still dominated by the physical filling effect.

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Assessment of hardened characteristics of raw fly ash blended self-compacting concrete

Cited by 20 publications

References 0 publications

Rheodynamic Concrete as a Progressive Viability in the field of Concrete Technology

Rheodynamic Concrete as a Progressive Viability in the field of Concrete Technology

Concreto autocompactante con materiales cementicios suplementarios de Colombia

Action Time-Effect and Mechanism of Low-Calcium Fly Ash in Cement-Based Composites

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