Influence of nano materials on flexural behavior and compressive strength of concrete

Mohamed, Anwar M.

doi:10.1016/j.hbrcj.2014.11.006

Cited by 102 publications

(46 citation statements)

References 7 publications

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“…Although a number of papers have been reported on the flexural performance of binary nanosilica [34], nanotube [35], or nanoclay [36] enhanced cements, no research has been presented in ternary blends reinforced with fibers. It is acknowledged that nMt nanoparticles can improve flexural strength and assign damping properties [37] to pastes they will be added to [19].…”

Section: Manufacturing and Fabrication Methods Cement MIX Characterizamentioning

confidence: 99%

From Nanostructural Characterization of Nanoparticles to Performance Assessment of Low Clinker Fiber–Cement Nanohybrids

Paine

2019

Applied Sciences

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With the current paper three nano-Montmorillonites (nMt) are applied in cement nanohybrids: an organomodified nMt dispersion, nC2; an inorganic nMt dispersion, nC3; and an organomodified powder, nC4. nC4 is fully characterized in this paper (X-ray diffraction, scanning electron microscopy/X-ray energy dispersive spectroscopy and thermal gravimetric analysis/differential thermogravimetry. Consecutively a ternary non pozzolanic combination of fiber–cement nanohybrids (60% Portland cement (PC) and 40% limestone (LS)) was investigated in terms of flexural strength, thermal properties, density, porosity, and water impermeability. Flexural strength was improved after day 28, particularly with the addition of the inorganic nMt dispersion. There was no change in density or enhancement in pozzolanic reactions for the powder nMt. Mercury intrusion porosimetry showed that the pore related parameters were increased. This can be attributed to mixing effects and the presence of fibers. Water impermeability tests yielded ambiguous results. Clearly, novel manufacturing processes of cement nanohybrids must be developed to eliminate mixing issues recorded in this research.

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Section: Manufacturing and Fabrication Methods Cement MIX Characterizamentioning

confidence: 99%

From Nanostructural Characterization of Nanoparticles to Performance Assessment of Low Clinker Fiber–Cement Nanohybrids

Paine

2019

Applied Sciences

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“…While the decrease in flexural strength with higher NS is attributed to the agglomeration of nanoparticles which adversely affect the microstructure of the hardened cement paste (Mohammed, 2015).…”

Section: Flexural Strengthmentioning

confidence: 99%

Flexural performance of nano silica modified roller compacted rubbercrete

Adamu¹

2017

Int. j. adv. appl. sci.

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Roller compacted concrete (RCC) has similar properties as conventional concrete; it is brittle, less ductile and has poor tensile strength. When used for pavement applications, it is also subjected to repetitive fatigue loads and flexural stresses. In addition, dowel bars or reinforcement cannot be used due to the way it is consolidated. These shorten the pavement life and increase the cost of maintenance. Therefore in order to reduce these defects by reducing the pavement deterioration and improving its service life, one of the possible ways is by incorporating additives such as polymers, fibers or crumb rubber (CR) into the RCC mix where it will absorb the deformation and strain energy caused by the repetitive loadings. The aim of this study was to improve the flexural strength, flexural toughness and ductility of RCC pavement. CR was used to partially replace fine aggregate at different percentages (0%, 10%, 20% and 30%) to produce roller compacted rubbercrete (RCR), and nano silica (NS) was added by weight of cementitious materials at 0%, 1%, 2% and 3% to mitigate loss in strength caused by CR. The findings showed that both flexural toughness and ductility index of RCC increases with increasing CR content. Similarly, the flexural strength of RCR increases for up to 20% replacement of fine aggregate with CR. The addition of NS increases the flexural strength of RCR; however it decreases toughness and ductility index, thereby making the RCR more rigid. Lastly response surface methodology (RSM) analysis was used to develop model for predicting the flexural toughness and ductility index of RCR using CR and NS as the variables. The analysis of variance (ANOVA) showed that the developed models have a good degree of correlation and predicting ability.

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“…Rong et al [46] studied the effects of 3% nano-SiO 2 particles on the durability of concrete containing 35% fly ash at 28 and 90 days, they reported about 11% improvement in flexural strength at 90 days compared to 28 days. Mohamed [47] also reported that flexural strength of concrete containing 1% nano-SiO 2 improved from 12.08 to 13.27 by 10 % after 90 days compared to its strength at 28 days. SEM images of the microstructure at 236 days of cement paste and the cement nanocomposite containing 1 wt% CNC (CNCC1) are shown in Fig.…”

Section: Flexural Strength Of Nanocompositesmentioning

confidence: 97%

Effect of calcined nanoclay on microstructural and mechanical properties of chemically treated hemp fabric-reinforced cement nanocomposites

Hakamy

Shaikh

Low

2015

Construction and Building Materials

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Cement nanocomposites reinforced with hemp fabrics and calcined nanoclay (CNC) have been fabricated and investigated. The treated hemp fabric-reinforced cement composites and nanocomposites were subjected to 3 wetting and drying cycles and then tested at 56 and 236 days. The influences of CNC dispersion on the durability of these composites have been characterized in terms of porosity, flexural strength, stress-midspan deflection curves and microstructural observation of hemp surface. The microstructure of matrix was investigated using X-ray Diffraction. Results indicated that the CNC effectively mitigated the degradation of hemp fibre. The durability and the degradation resistance of hemp fibre were enhanced due to the addition of CNC into the cement matrix and the optimum content of CNC was 1 wt%.

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Influence of nano materials on flexural behavior and compressive strength of concrete

Cited by 102 publications

References 7 publications

From Nanostructural Characterization of Nanoparticles to Performance Assessment of Low Clinker Fiber–Cement Nanohybrids

From Nanostructural Characterization of Nanoparticles to Performance Assessment of Low Clinker Fiber–Cement Nanohybrids

Flexural performance of nano silica modified roller compacted rubbercrete

Effect of calcined nanoclay on microstructural and mechanical properties of chemically treated hemp fabric-reinforced cement nanocomposites

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