The role of silica fume in the direct tensile strength of cement-based materials

Toutanji, Houssam; Liu, L.; El-Korchi, Tahar

doi:10.1007/bf02481516

Cited by 19 publications

(9 citation statements)

References 14 publications

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“…The most well-known effect of silica fume is the increase in strength [20,21,23,, including the compressive strength [20,23,, tensile strength [23,63,66,74,75,85] and flexural strength [62,69,75,86,87]. The strengthening is due to the pozzolanic activity of silica fume causing improved strength of the cement paste [39,82], the increased density of mortar or concrete resulting from the fineness of silica fume and the consequent efficient reaction to form hydration products, which fill the capillaries between cement and aggregate [53], the refined pore structure [58,79] and the microfiller effect of silica fume [79,80].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Cement-matrix structural nanocomposites

Chung

2004

Met. Mater. Int.

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This paper reviews cement-matrix structural nanocomposites, including those with particulate and fibrous reinforcements. Silica fume is valuable for improving numerous mechanical properties, in addition to enhancing the freeze-thaw durability, the vibration damping capacity, the abrasion resistance, the bond strength with steel rebars, the chemical attack resistance and the corrosion resistance of steel rebars. Furthermore, silica fume decreases the alkali-silica reactivity, the drying shrinkage, permeability, creep rate and thermal expansion. On the other hand, carbon nanofiber is not attractive, as it fails to compete with conventional discontinuous carbon fiber as a reinforcement.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Cement-matrix structural nanocomposites

Chung

2004

Met. Mater. Int.

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“…However, one of the main limitations to the more widespread use of CFRP in rehabilitating application is the uncertainty in the long-term durability of the CFRP/concrete system upon exposure to service environments [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Durability of concrete with CFRP wrapping

2018

MATEC Web Conf.

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Carbon fibre-reinforced polymer (CFRP) material has a high strength-to-weight ratio and good resistance to corrosion and environmental attacks. It has been widely used in rehabilitation of aged infrastructure. However, the durability of the strengthened system has not been yet assessed thoroughly since most of the previous study was conducted based on accelerated tests while the long-term investigation was less reported. This paper investigated the effect of CFRP wrapping on the axial behaviour of concrete cylinders subjected to different environments for more than 13 years. The specimens were exposed to five different conditions, including standard curing, immersion in distilled water, immersion in saturated Na2SO4 solution, outdoor sheltered from the rain, and outdoor without shelter from the rain. Axial compression tests were performed on the wrapped concrete cylinders. The load-bearing capacity and stress-strain responses were recorded. It was found that CFRP wrapping could effectively improve the ultimate strength and ductility of the columns. Though scatter existed, no significant effect of the environmental exposure on the load-bearing capacity of the cylinder specimens was observed which indicates a good durability of the strengthening system.

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“…The temperature of thermal activation (800 ± 3 °C) was chosen according of the results of thermal analysis of silica gel (Figure 1) 9,52 , which insignificant effect on the cement hydration process.…”

Section: Resultsmentioning

confidence: 99%

“…Direct tensile strength of hardened cement paste and mortar containing silica fume was evaluated at various water-cement ratios 9 . The results show that partial replacement of cement by 8% of silica fume resulted in higher tensile strength of the mortar, but showed no effect on the tensile strength of the cement paste.…”

Section: Introductionmentioning

confidence: 99%

Utilization of by-product waste silica in concrete - based materials

et al. 2012

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The usage of waste silica from AlF 3 production is limited due to admixtures of fluoride in its composition. The negative effect of admixtures was eliminated by thermally activating this silica gel. After thermal activation the mineralogical composition of silica gel changes. Fluorine is binding in low-reactive compounds, which insignificant effect on the cement hydration process. The possibilities of using waste by-product silica in hardened cement paste were investigated. Silica gel could be used as additive of the hardened cement paste after thermal activation (1 hour at 800 °C temperature). It was discovered that the optimum content of thermally activated technogenic silica gel additive under the conditions explored was up to 10% of the total quantity of the cement. After 28 days of hardening, the strength of hardened cement paste increased 7 MPa when the quantity of the additive was -10% of the total weight when compared to the strength qualities of the samples with no additives used.

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The role of silica fume in the direct tensile strength of cement-based materials

Cited by 19 publications

References 14 publications

Cement-matrix structural nanocomposites

Cement-matrix structural nanocomposites

Durability of concrete with CFRP wrapping

Utilization of by-product waste silica in concrete - based materials

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