Influence of mix composition and strength on the fracture properties of self-compacting concrete

Alyhya, Wajde S.; Dhaheer, M. S. Abo; Al-Rubaye, Muna M.; Karihaloo, Bhushan Lal

doi:10.1016/j.conbuildmat.2016.02.037

Cited by 45 publications

(24 citation statements)

References 43 publications

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“…From the results in Table 2, it can be additionally observed that an increase in the paste to solid ratio (p/s) leads to a slight increase in the mechanical properties of the SCC mixes, in a similar way to that reported recently by Alyhya et al (24). A direct comparison of results of the SCC mixes NS-B and NS-C with same w/cm ratio but different p/s ratios shows that all the mechanical properties of the NS-C mixes (f c , f st and E c ) with higher p/s ratio are slightly higher than those corresponding to NS-B mixes.…”

Section: Mechanical Propertiessupporting

confidence: 72%

“…The obtained values of a 1 , which corresponds to the slope of the first steep branch of the bilinear softening diagram (Figure 5), increases with an increase of the coarse aggregate volume fraction and the paste to solid ratio, as previously observed by Alyhya et al (24). Analogously, the critical opening displacement (w c ) is influenced by the CA and the w/cm ratio, increasing with an increase of CA and a decrease of w/cm ratio.…”

Section: Bilinear Tension Softening Diagramsupporting

confidence: 67%

“…On the one hand, direct comparison of values obtained for NS-B and NS-C mixes with same w/cm ratio but different p/s ratio shows a decrease in G F with an increase in the p/s. This effect was also observed by Alyhya et al (24), as they obtained a noticeable decrease in G F with an increase in the p/s ratio for different SCC mixes with compressive strength ranging from 30 to 80 MPa. Nevertheless, if the values obtained for the HS mixes are compared with the analogous values for NS mixes it is observed that there is no increase in the values of G F with a decrease in the w/ cm ratio, as might have been expected.…”

Section: Influence Of the MIX Composition And Strength On Fracture Ensupporting

confidence: 66%

“…In most cases, the values are lower than the usual value of 2/3 for VC (32). As observed, this relationship is specially influenced by p/s and the w/cm ratios of the mix, increasing with an increase in p/s and a decrease in w/cm ratio as previously demonstrated by Alyhya et al (24).…”

Section: Bilinear Tension Softening Diagramsupporting

confidence: 52%

“…The parameters of the diagram corresponding to the size-independent specific fracture energy for each SCC mixes are determined by Effect of mix design on the size-independent fracture energy of normal-and high-strength self-compacting concrete • 7 an inverse analysis according to the non-linear hinge model described in (30,31). Since an analysis of the influence of the microstructure of SCC mixes is performed in this work, it should be pointed out that the bilinear tension softening diagram ( Figure 5) captures the micro-cracking and frictional dissipation processes responsible for the observed postpeak behavior in a concrete mix (24). The first steep linear branch of the softening diagram is due to the micro-cracking, whereas the shallow second linear branch is a consequence of the frictional dissipation processes, e.g.…”

Section: Bilinear Tension Softening Diagrammentioning

confidence: 99%

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Effect of mix design on the size-independent fracture energy of normal- and high-strength self-compacting concrete

Cifuentes¹,

Ríos²,

Gómez³

2018

Mater. construcc.

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Self-compacting concrete has a characteristic microstructure inherent to its specific composition. The higher content of fine particles in self-compacting concrete relative to the equivalent vibrated concrete produces a different fracture behavior that affects the main fracture parameters. In this work, a comprehensive experimental investigation of the fracture behavior of self-compacting concrete has been carried out. Twelve different self-compacting concrete mixes with compressive strength ranging from 39 to 124 MPa (wider range than in other studies) have been subjected to three-point bending tests in order to determine the specific fracture energy. The influence of the mix design and its composition (coarse aggregate fraction, the water to binder ratio and the paste to solids ratio) on its fracture behavior has been analyzed. Moreover, further evidence of the objectivity of the size-independent fracture energy results, obtained by the two most commonly used methods, has been provided on the self-compacting concrete mixes. RESUMEN:Influencia de la composición de la mezcla sobre la energía de fractura de hormigones autocompactantes de resistencias media y alta. Los hormigones autocompactantes tienen una microestructura interna inherente a su composición específica. Su mayor contenido de partículas finas, en comparación con hormigones vibrados equivalentes, provoca un comportamiento diferente en fractura que afecta a los principales parámetros de fractura. En este trabajo, se ha realizado una amplia investigación experimental del comportamiento en fractura de hormigones autocompactantes. Así, se han realizado ensayos de flexión en tres puntos para determinar sus propiedades de fractura sobre 12 hormigones autocompactantes de diferente composición, con resistencias a compresión que van desde 39 hasta 124 MPa (mayor que en otros estudios). De esta forma, se ha analizado la influencia de la dosificación del hormigón y su composición (contenido en árido grueso, relación agua-cemento y pasta-sólidos) sobre su comportamiento en fractura. Además, se ha validado, para hormigones autocompactantes, la objetividad de los resultados obtenidos mediante los dos métodos habitualmente empleados para la determinación de la energía de fractura.

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Section: Mechanical Propertiessupporting

confidence: 72%

Section: Bilinear Tension Softening Diagramsupporting

confidence: 67%

Section: Influence Of the MIX Composition And Strength On Fracture Ensupporting

confidence: 66%

Section: Bilinear Tension Softening Diagramsupporting

confidence: 52%