Optimized Fresh and Hardened Properties of Strain-Hardening Cementitious Composites: Effect of Sand Size and Workability

Khan, M. Iqbal; Fares, Galal; Mourad, Shehab; Abbass, Wasim

doi:10.1061/(asce)mt.1943-5533.0001665

Cited by 21 publications

(8 citation statements)

References 11 publications

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“…1b and c, the shape of FA particles is spherical while GGBS particles are mostly angular. It was found that the fracture toughness of the cementitious matrix increases with the size of aggregate [51], which may impair the strain hardening behaviour of composites. To control the fracture toughness of the geopolymer matrix, fine silica sand (see Fig.…”

Section: Raw Materialsmentioning

confidence: 99%

Effect of recycled tyre polymer fibre on engineering properties of sustainable strain hardening geopolymer composites

Zhong

Zhang

2021

Cement and Concrete Composites

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Section: Raw Materialsmentioning

confidence: 99%

Effect of recycled tyre polymer fibre on engineering properties of sustainable strain hardening geopolymer composites

Zhong

Zhang

2021

Cement and Concrete Composites

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“…The multiple cracking behavior may be attributed to the poor dispersion of fiber; and greater matrix strength is caused by coarse sands (17).This phenomenon is in line with the various deflection-hardening response in section 5.1.3. The better deflection-hardening response generally means multiple cracking behaviors (16,32). In general, A_36_87 presents not only a improved flexural behavior but also the enhanced strength, so it is used in current research for the production of slab specimen.…”

Section: Flexural Toughness and Failure Pattern Of Beamsmentioning

confidence: 99%

Effect of hybrid fibers, calcium carbonate whisker and coarse sand on mechanical properties of cement-based composites

Cao

Khan

2018

Mater. construcc.

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Nowadays researchers are developing a new hybrid fiber reinforced cement-based composites (HyFRCC). The new HyFRCC can restrain micro-cracking, improves compressive and flexural performance of beams by addition of calcium carbonate (CaCO 3 ) whisker, polyvinyl alcohol (PVA) fiber and steel fiber. In this work, a mix optimization procedure is shown for multi-scale HyFRCC, with steel, PVA fiber and CaCO 3 whisker. The new HyFRCC is explored with addition of coarse sand to further improve its mechanical properties. Additionally, the flexural performance of beam and slabs has been investigated to optimize sand gradation and fiber combination in new HyFRCC. The compressive strength, flexural strength, flexural behavior, flexural toughness, equivalent flexural strength and deflection-hardening behavior of beams and slabs are improved with optimized content of sand gradation, fibers and CaCO 3 whisker. The HyFRCC slab with 1.5% steel fiber, 0.4% PVA fiber, 1% CaCO 3 whisker and optimized coarse sand showed overall best properties. Citation/Citar como: Cao, M.; Li, L.; Khan, M. (2018) Effect of hybrid fibers, calcium carbonate whisker and coarse sand on mechanical properties of cement-based composites. Mater. Construcc. 68 [330], e156 https://doi.org/10.3989/ mc.2018.01717 RESUMEN:Effecto de fibras híbridas, filamentos de carbonato cálcico y arena gruesa en las propiedades mecánicas de cementos compuestos. En la actualidad se están desarrollando nuevos cementos compuestos reforzados con fibras híbridas (HyFRCC, por sus siglas en inglés). Estos nuevos cementos HyFRCC pueden impedir la microfisuración y aumentar la resistencia a compresión y flexotracción de las vigas, mediante la incorporación de filamentos de carbonato cálcico (CaCO 3 ), fibras de alcohol polivinílico (PVA) y fibras de acero. En este trabajo se plantea un procedimiento para optimizar la proporción de fibras (de acero y de PVA) y filamentos (de CaCO 3 ) en un nuevo HyFRCC. Se investiga la influencia de la arena gruesa en sus propiedades mecánicas, además de la resistencia a flexotracción de vigas y forjados a fin de adecuar la granulometría de la arena y la combinación de fibras en el nuevo material. Un buen ajuste entre el contenido y la granulometría de la arena y la proporción de las fibras y de los filamentos de CaCO 3 permite: incrementar la resistencia tanto a compresión como a flexotracción, la tenacidad a flexotracción y la resistencia a flexotracción equivalente; perfeccionar el comportamiento a flexión; y reducir la flecha de vigas y forjados endurecidos. La mezcla que mejores resultados arroja en conjunto contiene 1,5 % de fibras de acero, 0,4 % de fibras de PVA, 1 % de filamentos de CaCO 3 y arena gruesa optimizada. PALABRAS CLAVE: Composite; Microfisuras; Carbonato cálcico; Resistencias a compresión; Resistencias a flexión ORCID ID: M. Cao

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“…is the amount of mercury fed in the ith feeding operation, m 3 , n is the number of intervals applied in the mercury feeding operation, dn is the pore diameter corresponding to the nth mercury feeding, m, Vn is the cumulative amount of mercury fed in pressure intervals 1 to…”

Section: Microstructure Characterizationmentioning

confidence: 99%

“…3 ; C is a constant; Wn is the accumulated surface energy in the mercury intrusion process up to the nth stage, Qn is the function of pore radius rn and pore volume Vn at the nth stage of mercury intrusion process, and D is the fractal dimension calculated based on thermodynamic relations. The corresponding groups of 2 / n n W d and Qn were obtained from the experimental mercury compression data, and then the logarithm of these two was plotted for linear regression.…”

mentioning

confidence: 99%

Relationship between Fractal Dimension and Properties of Engineered Cementitious Composites with Different Aggregates

et al. 2022

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In this study, the effects of different fine aggregates on the properties of polyethylene fiber engineered cementitious composite (PE-ECC) were systematically investigated. The PE-ECCs were prepared with four fine aggregates, respectively. Furthermore, their flowability, compressive strength, and uniaxial tensile properties were studied experimentally and comparatively analyzed by microscopic techniques including X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive spectroscopy (EDS), and mercury intrusion porosimetry (MIP). The results showed that all the different types of fine aggregates exhibited little effect on the flowability of PE-ECC, but a greater effect on the compressive strength, uniaxial tensile strength, and ultimate tensile strain. PE-ECC prepared from untreated desert sand showed the best comprehensive performance, with compressive strength, uniaxial tensile strength, and ultimate tensile strain of 47.92 MPa, 6.26 MPa, and 3.638%, respectively. Moreover, it was found that the ultra-fine particles in the desert sand promoted the hydration reaction of cement and produced more C–S–H gels. The pore structures of ECC prepared with different aggregates exhibited obvious fractal characteristics, and the fractal dimension ranged from 2.8 to 2.9. The fractal dimension showed a strong correlation with parameters including ultimate tensile strain and pore structure, and the larger the fractal dimension, the smaller the ultimate tensile strain, porosity, and average pore size of ECC.

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Optimized Fresh and Hardened Properties of Strain-Hardening Cementitious Composites: Effect of Sand Size and Workability

Cited by 21 publications

References 11 publications

Effect of recycled tyre polymer fibre on engineering properties of sustainable strain hardening geopolymer composites

Effect of recycled tyre polymer fibre on engineering properties of sustainable strain hardening geopolymer composites

Effect of hybrid fibers, calcium carbonate whisker and coarse sand on mechanical properties of cement-based composites

Relationship between Fractal Dimension and Properties of Engineered Cementitious Composites with Different Aggregates

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