The Role of Silica Fume in the Adhesion of Concrete Restoration Systems

Tayeh, Bassam A.; Bakar, B.H. Abu; Johari, Megat Azmi Megat; Zeyad, Abdullah M.

doi:10.4028/www.scientific.net/amr.626.265

Cited by 31 publications

(12 citation statements)

References 5 publications

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“…The increment in strength is caused by the occurrence of pozzolanic reactions of portlandite (Ca(OH) 2 ) formed in the aftermath of hydration reaction with silica (SiO 2 ) compositions of POFA. This reaction leads to the formation of secondary hydration products (C-S-H) at a faster rate than possible at early days due to less presence of portlandite [32,33]. The similar effect is observed in Fig.…”

Section: Effect Of Pofa On Compressive Strengthsupporting

confidence: 78%

Workability, Setting Time and Strength of High-Strength Concrete Containing High Volume of Palm Oil Fuel Ash

Zeyad¹,

Tayeh²,

Saba³

et al. 2018

TOCIEJ

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Introduction: Palm oil fuel ash in two various forms-ground (GPOFA) by heat-treated carbon-free ultrafine of a median particle size of 2 μm (UPOFA) were utilized to produce high strength concretes (HSC-GPOFA (HSCgx), HSC-UPOFA (HSCux), and HSC-OPC) at different levels ordinary Portland cement (OPC) partial replacements (x) of 20, 40 and 60%. Methods: The workability (slump, slump loss, and compacting factor), initial and final setting times and strength in both forms of concrete were investigated. Results and Conclusion: The results showed that HSCu had improved physical properties and chemical compositions, extended setting times, enhanced workability, better strength, and enhanced workability retention compared to HSCg and HSC-OPC. Further, POFA carbon content negatively influenced the workability and setting time, while its specific gravity had a positive influence due to the enhancement of paste volume and particles lubrication effects. However, carbon content and surface areas of POFA did not significantly influence the compressive strength of HSC at the level of partial OPC substitution not exceeding 40%.

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Section: Effect Of Pofa On Compressive Strengthsupporting

confidence: 78%

Workability, Setting Time and Strength of High-Strength Concrete Containing High Volume of Palm Oil Fuel Ash

Zeyad¹,

Tayeh²,

Saba³

et al. 2018

TOCIEJ

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“…Besides, the SiO 2 contained in UPOFA reacted with the Ca (OH) 2 generated by the hydration process of cement to form secondary calcium-silicate-hydrate (C-S-H). The aggregate packing effect and enhancement of microstructural density through secondary hydration of UPOFA effect enhanced the compressive strength (Tayeh et al 2013c). …”

Section: Compressive Strengthmentioning

confidence: 99%

Improving the Engineering and Fluid Transport Properties of Ultra-High Strength Concrete Utilizing Ultrafine Palm Oil Fuel Ash

Mohammed

Johari

Zeyad

et al. 2014

ACT

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Ground treated ultrafine-POFA obtained from palm oil industry was heat-treated to remove excess carbon. The varied proportion (17%, 30% and 40%) of UPOFA was incorporated into the ultra-high strength concrete (UHSC) to study its effects on the UPOFA-UHSC (U x -UHSC) in comparison with OPC-UHSC (U 0 -UHSC) engineering and transport properties. The U x -UHSC has an increasing workability tendency with a retarded setting times as compared to U 0 -UHSC. Besides, U x -UHSC registered higher compressive strength than the U 0 -UHSC. The 90-d strength of 156 MPa was achieved in U 17 -UHSC which was 4.7%, 7.5% and 12.2% higher than the values obtained for U 30 -UHSC, U 40 -UHSC and U 0 -UHSC, respectively. The U 40 -UHSC exhibited the greatest improvement at 90 days in transport properties such as porosity, water absorption, initial surface absorption, rapid chloride permeability, gas permeability and water permeability while the highest strength was recorded with U 17 -UHSC. Thus, the pozzolanic UPOFA is capable of improving the engineering and transport properties of UHSC.

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“…24, which shows that microcracks were induced in the normal concrete substrate part. The excellent permeability of the high-strength basalt fibre SCC played a remarkable role in enhancing the bond strength of the interfacial surface of the hybrid concrete samples [55]. Accordingly, good adhesion and superior interlock were achieved between the old and new concrete segments.…”

Section: Slant Shear Strengthmentioning

confidence: 93%

Effect of high temperature on the mechanical properties of basalt fibre self-compacting concrete as an overlay material

Haido

Tayeh

Majeed

et al. 2021

Construction and Building Materials

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The compressive strength of the basalt fibre SCC was diminished by 28% at 500°C. The splitting tensile strength of the SCC was increased by adding 0.25% of fibre. Considerable degradation in the flexural strength of fibrous SCC was seen at 300°C. Slant shear of hybrid concrete was highly affected by fibre content of overlay. Interfacial surface roughened by sand blast provided proper bond in hybrid sample.

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The Role of Silica Fume in the Adhesion of Concrete Restoration Systems

Cited by 31 publications

References 5 publications

Workability, Setting Time and Strength of High-Strength Concrete Containing High Volume of Palm Oil Fuel Ash

Workability, Setting Time and Strength of High-Strength Concrete Containing High Volume of Palm Oil Fuel Ash

Improving the Engineering and Fluid Transport Properties of Ultra-High Strength Concrete Utilizing Ultrafine Palm Oil Fuel Ash

Effect of high temperature on the mechanical properties of basalt fibre self-compacting concrete as an overlay material

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