RETRACTED: Effect of nano-CuO and fly ash on the properties of self-compacting mortar

Khotbehsara, Mojdeh Mehrinejad; Mohseni, Ehsan; Yazdi, Mohammad Ali; Sarker, Prabir Kumar; Ranjbar, Malek Mohammad

doi:10.1016/j.conbuildmat.2015.07.063

Cited by 84 publications

(31 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Slump diameter values increased as FA addition reaches to 15% then declines with increasing addition percent compared to that of the control mixes. This is due to the low internal friction of the angular cement particles associated with a relatively smooth surface and the replacement of the spherical shape with the FA . In addition, FA mixes have lower w/b ratios than other mortar mixes.…”

Section: Resultsmentioning

confidence: 99%

“…This is due to the low internal friction of the angular cement particles associated with a relatively smooth surface and the replacement of the spherical shape with the FA. 30,31 In addition, FA mixes have lower w/b ratios than other mortar mixes. FA has some advantages of improving rheological properties in concrete/mortar, acting as a lubricant 30 , reducing concrete crack due to the reduction of the heat of hydration of the concrete/mortar, using as filler in the mortars.…”

Section: 55 | Strength Activity Indexmentioning

confidence: 99%

See 1 more Smart Citation

Mechanical and durability properties of self‐compacting mortars containing binary and ternary mixes of fly ash and silica fume

Benli

2019

Structural Concrete

View full text Add to dashboard Cite

In this paper, the results of experimental work on the strength and durability performances of self‐compacting mortars (SCMs) manufactured from silica fume (SF) and fly ash (FA) were presented. The cement was partially replaced with 5, 10, 15, 20, and 25% of FA and 5, 10, and 15% of SF as binary mixes. Also, ternary mixtures were prepared by the incorporation of FA and SF at different replacement dosages by weight. In total, 14 different combinations of mixes were studied at the ages of 7, 28, and 180 days. Prismatic samples of size 40 × 40 × 160 mm3 were produced and exposed to water curing to observe mechanical behavior of SCMs. The mechanical properties of SCMs were examined by the tests of compressive strength and flexural strength. Sorptivity, porosity, water absorption, and density were also measured. To evaluate fresh properties of SCMs, mini slump flow diameter and mini V‐funnel flow time tests were conducted. The results of the study reveal that increase in the dosage of FA increases SCMs flow but also reduce segregation resistance. The enhancement in flexural strength is the best in the binary mixes of SF10 and in binary mixes of FA. Ten percent replacement of FA shows the best flexural strength performance with a value of 10.21 MPa at the age of 180 days. Compressive and flexural strengths of mortars containing SF and FA reached up to about 86.14 and 10.50 MPa, respectively.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: 55 | Strength Activity Indexmentioning

confidence: 99%

Mechanical and durability properties of self‐compacting mortars containing binary and ternary mixes of fly ash and silica fume

Benli

2019

Structural Concrete

View full text Add to dashboard Cite

show abstract

“…erefore, nanoparticles could be considered as an alternative choice to serve as accelerators for cementitious materials under low temperatures. Numerous studies have been conducted on the utilization of nanoparticles, including nano-SiO 2 [12][13][14][15][16][17][18][19][20][21][22], nano-CaCO 3 [17,23,24], nano-Al 2 O 3 [16,20,25], nano-TiO 2 [14,16,[26][27][28][29][30][31][32][33][34][35][36][37][38], nano-Fe 2 O 3 [10,13], and nano-CuO [13,39], in cementitious materials to improve their durability and mechanical properties. Nano-SiO 2 is the most commonly used nanoparticle, while nano-TiO 2 is comparatively favorable for pavement structures in terms of aircleaning property.…”

Section: Introductionmentioning

confidence: 99%

Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

Wang

Zhang

Gao

2018

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Low temperature negatively affects the engineering performance of cementitious materials and hinders the construction productivity. Previous studies have already demonstrated that TiO 2 nanoparticles can accelerate cement hydration and enhance the strength development of cementitious materials at room temperature. However, the performance of cementitious materials containing TiO 2 nanoparticles at low temperatures is still unknown. In this study, specimens were prepared through the replacement of cement with 1 wt.%, 2 wt.%, 3 wt.%, 4 wt.%, and 5 wt.% TiO 2 nanoparticles and cured under temperatures of 0°C, 5°C, 10°C, and 20°C for specific ages. Physical and mechanical properties of the specimens were evaluated through the setting time test, compressive strength test, flexural strength test, hydration degree test, mercury intrusion porosimetry (MIP), X-ray diffraction (XRD) analysis, thermal gravimetric analysis (TGA), and scanning electron microscopy (SEM) in order to examine the performance of cementitious materials with and without TiO 2 nanoparticles at various curing temperatures. It was found that low temperature delayed the process of cement hydration while TiO 2 nanoparticles had a positive effect on accelerating the cement hydration and reducing the setting time in terms of the results of the setting time test, hydration degree test, and strength test, and the specimen with the addition of 2 wt.% TiO 2 nanoparticles showed the superior performance. Refined pore structure in the MIP tests, more mass loss of CH in TGA, intense peak appearance associated with the hydration products in XRD analysis, and denser microstructure in SEM demonstrated that the specimen with 2 wt.% TiO 2 nanoparticles exhibited preferable physical and mechanical properties compared with that without TiO 2 nanoparticles under various curing temperatures.

show abstract

“…Most of the studies found, have been conducted with nano-SiO 2 (Du et al, 2014;Hou et al, 2013) in cement-based materials. Recently, the effects of other nanoparticles, such as nano-Al 2 O 3 , nano-TiO 2 , nano-CuO, nano-Fe 2 O 3 and nano-ZnO 2 on the physical and mechanical properties of cement-based materials were also investigated in a few studies (Mohseni et al, 2015a;Madandoust et al, 2015;Khotbehsara et al, 2015;Yang et al, 2015;Mohseni et al, 2015b). Publications on HPC containing nanoparticles are limited in the literature.…”

Section: Introductionmentioning

confidence: 99%

Durability Properties of High-Performance Concrete Incorporating Nano-TiO<sub>2</sub> and Fly Ash

Mohseni¹,

Ranjbar²,

Tsavdaridis³

2015

American Journal of Engineering and Applied Sciences

Self Cite

View full text Add to dashboard Cite

High Performance Concrete (HPC) is a concrete that is designed to provide high strength and excellent durability. This paper investigates the hardened properties of HPC incorporating nano-TiO 2 (NT) and Fly Ash (FA). TiO 2 nanoparticles at the rates of 1, 2 and 3% and low-calcium fly ash at the rate of 30% of the binder by weight were considered. Compressive strength was conducted at the ages of 7 days as an early age and 28 days as the standard age to determine the mechanical properties of HPC incorporating FA and NT. The durability performance was assessed by means of water absorption by capillarity, ultrasonic pulse velocity, chloride diffusion and resistance to sulphuric acid attack. The results indicated that the concretes containing NT increased content show improved durability performance. Moreover, the results showed significant improvement in the properties of the samples incorporating the replacement of cement with a combination of 1% TiO 2 nanoparticles and 30% FA.

show abstract

RETRACTED: Effect of nano-CuO and fly ash on the properties of self-compacting mortar

Cited by 84 publications

References 36 publications

Mechanical and durability properties of self‐compacting mortars containing binary and ternary mixes of fly ash and silica fume

Mechanical and durability properties of self‐compacting mortars containing binary and ternary mixes of fly ash and silica fume

Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

Durability Properties of High-Performance Concrete Incorporating Nano-TiO<sub>2</sub> and Fly Ash

Contact Info

Product

Resources

About

RETRACTED: Effect of nano-CuO and fly ash on the properties of self-compacting mortar

Cited by 84 publications

References 36 publications

Mechanical and durability properties of self‐compacting mortars containing binary and ternary mixes of fly ash and silica fume

Mechanical and durability properties of self‐compacting mortars containing binary and ternary mixes of fly ash and silica fume

Effect of TiO2 Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

Durability Properties of High-Performance Concrete Incorporating Nano-TiO<sub>2</sub> and Fly Ash

Contact Info

Product

Resources

About

Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures