Hydration versus strength in a portland cement developed from domestic mineral wastes — a comparative study

Bhatty, Javed I.

doi:10.1016/0040-6031(86)85120-6

Cited by 166 publications

(60 citation statements)

References 4 publications

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“…Este porcentaje adicional se le atribuye a la portlandita (CH) carbonatada, por lo que la cantidad de CH equivalente estará dado por el porcentaje de pérdidas en T2 más el 41% de las pérdidas en T3. El grado de hidratación α estará directamente relacionado con el total de agua combinada (α = WB/0.24) (Bhatty, 1986; Influence of metakaolin and silica fume in the development of compressive strength of high-performance concrete… Anales de Edificación, Vol. 6, Nº 1, 70-76 (2020).…”

Section: Atd-tgunclassified

Influencia del uso de metacaolín y el humo de sílice en el desarrollo de la resistencia a compresión del hormigón de altas prestaciones y su relación con la microestructura = Influence of metakaolin and silica fume in the development of compressive strength of high performance concrete and its relationship with the microstructure

Paredes

Gálvez

Alberti

et al. 2020

ADE

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Resumen-Research developed in the last decades has allowed significant advances in the concrete technology, achieving remarkable improvements in its performancemainly related to its microstructure. In order to relate the behaviour under compressive stresses of high performance concrete (HPC) and the changes in its microstructure, an experimental campaign was developed with specimens of dimensions 160x40x40 mm 3. A control mixture without additions and a series of mix designs with partial substitution of cement by of silica fume and metakaolin in different proportions were produced. A low water-to-binder ratio of 0.20 was used, which forced the use of a superplasticizer additive based on modified polycarboxylates, which improved the workability of the mixtures. Silica sand with 98% of SiO2 content and an average particle size of 0.75 mm was used. The specimens were subjected to compressive strength tests at 2, 7, 28 and 91 days, and complementary tests of electric resistivity, mercury intrusion porosimetry (MIP) and differential thermalthermogravimetric analysis (DTA-TG) at 28 days. The results of the tests showed that the increase in compressive strength with the use of additions was directly related to the reduction in total porosity and the increase in the proportion of total CSH gel / total portlandite, shown by the MIP and DTA-TG tests, respectively. Mixtures with additions showed reductions of the porosity by up to 31.7% compared with the control mixture, while increasing the proportion of CSH gel/ total portlandite by up to 17.1%. The use of small particles of mineral additions significantly increased the electric resistivity of HPC specimens as evidenced in the present study. This is explained by the reduction in the percentage of large capillary pores and the relative increase of small capillaries, which could enhance the durability of the concrete elements.

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Section: Atd-tgunclassified

Influencia del uso de metacaolín y el humo de sílice en el desarrollo de la resistencia a compresión del hormigón de altas prestaciones y su relación con la microestructura = Influence of metakaolin and silica fume in the development of compressive strength of high performance concrete and its relationship with the microstructure

Paredes

Gálvez

Alberti

et al. 2020

ADE

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“…According to Bhatty (1986), in order to determine the cement hydration degree the denominator in relationship 2 2009). Additionally, the presence of additives among other things silica fume and the elevated temperature at which the hydration process takes place also affect the amount of chemically bound water.…”

Section: Materials Microstructure In the Healed Crackmentioning

confidence: 99%

Autogenous Healing Effect of Ultra-High Performance Cementitious Composites

Zdeb

2018

ACT

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This paper presents the results of research concerning the potential ability of ultra-high performance cementitious composites to self-heal the cracks that appear at various curing stages, and the effect of additional hydrothermal treatment on this ability. Test specimens were fractured in a 3-point bending test. The preload was induced during the initial curing period, i.e. 24 hours after the mix was made, and also in matured materials: concrete that was cured for 28 days in water or subjected to low-pressure steaming or autoclaving. Flexural strength and total fracture energy tests were carried out on reference specimens and also on specimens with a crack healed by immersion in water and by the additional use of steaming at 90°C and autoclaving at 250°C. The results of studies performed with respect to mechanical properties and microstructure observations show that material that was cracked at early curing stages can be most effectively healed (i.e. its strength restored) by the autoclaving process. The main reason for this is the crystallisation of xonotlite and tobermorite whiskers in the healed crack. The self-healing effect tested in matured composites where binder hydration was determined to be of around 40% turned out to be virtually negligible.

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“…Entendiendo como tal la cantidad máxima de agua que una pasta de cemento puede fijar en su estructura. La bibliografía acepta que para un cemento I este valor es de 0.24 (Bhatty, 1986).…”

Section: Estimación Del Grado De Hidratación Según Bhattyunclassified

“…En este apartado se han empleado los métodos de Bhatty y Pane/Hansen (Bhatty, 1986, Pane y Hansen, 2005) para estimar el grado de hidratación, se han evaluado los resultados obtenidos, y se han propuesto ciertas correcciones que permitan comprender mejor los procesos de hidratación de las mezclas, todo ello teniendo en cuenta que las dosificaciones de cemento empleadas corresponden a cementos comerciales y no a mezclas elaboradas en el laboratorio.…”

Section: Evaluación Del Grado De Hidratación a Partir De Los Datos Deunclassified

“…El método de Pane/Hansen establece la referencia sobre la masa calcinada. Para expresar el resultado de W B140 respecto a la masa calcinada bastaría con multiplicar esta cifra por la inversa de la relación m f/ m 40ºC mostrada para cada tipo de muestra en la Tabla 31 a la Tabla 33. para la hidratación completa (Bhatty, 1986). A edad madura las muestras presentan un ligero aumento de la hidratación que ya se observaba en el aumento del valor W B (Tabla 34).…”

Section: Figura 52 Grados De Hidrataciónunclassified

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Estudio microestructural de pastas de cemento expuestas a medios simulados de agresividad moderada frecuentes en ambientes rurales

Fuentes¹

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Hydration versus strength in a portland cement developed from domestic mineral wastes — a comparative study

Cited by 166 publications

References 4 publications

Autogenous Healing Effect of Ultra-High Performance Cementitious Composites

Estudio microestructural de pastas de cemento expuestas a medios simulados de agresividad moderada frecuentes en ambientes rurales

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