Performance of nano-Silica modified high strength concrete at elevated temperatures

Bastami, Morteza; Baghbadrani, M.; Aslani, Farhad

doi:10.1016/j.conbuildmat.2014.06.026

Cited by 132 publications

(70 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For large amounts of nano- silica, the maximum gain on mechanical properties for mixtures formulated with 10 wt% of silica nanoparticles was reported [16]. The flexural strength and elastic modulus present the same tendency for optimum nano-silica contents obtained for compressive strength, as reported in [7][8][9]12].…”

Section: Introductionsupporting

confidence: 51%

See 1 more Smart Citation

Effects of nano-silica on mechanical performance and microstructure of ultra-high performance concrete

Mendes

Repette

Reis³

2017

Cerâmica

View full text Add to dashboard Cite

INTRODUCTIONNowadays, nanoparticles such as silicon dioxide [1][2][3], Portland cement [4], and carbon nanotubes (CNT) [5,6] have been tested in ultra-high strength concretes in order to improve their performance. The results published in [7] show an optimum nano-silica content, i.e. the smallest quantity of nano-particles that leaded to the maximum compressive strength gain, for mixtures containing 0.5 wt% of silica nanoparticles. In [8], the maximum gain on compressive strength was observed for mixtures containing 2 wt% of nano-silica. The results published in [9] show a maximum gain on compressive strength for mixtures containing 2.82 wt% of nano-silica. In [10][11][12], the optimum content for mixtures containing 3 wt% of nano-silica was observed. In [13] the maximum compressive strength occurred for mixtures formulated with 4 wt% of nano-silica. Results published in [14] exhibit a tendency of linear increase on compressive strength, reaching the maximum strength for concretes formulated with 5 wt% of nanoparticles. In [15] the optimum nano-silica content was reached for mixtures containing 6% of nanoparticles. For large amounts of nanoCerâmica 63 (2017) [387][388][389][390][391][392][393][394] http://dx.doi.org/10.1590/0366-69132017633672037Effects of nano-silica on mechanical performance and microstructure of ultra-high performance concrete (Efeitos da nanossílica no desempenho mecânico e microestrutura de concretos de ultra-alta resistência) UEL, Londrina, PR thiagomendes@utfpr.edu.br, wellington.repette@gmail.br, pjlondrina@yahoo.com.br AbstractThe use of nanoparticles in ultra-high strength concretes can result in a positive effect on mechanical performance of these cementitious materials. This study evaluated mixtures containing 10 and 20 wt% of silica fume, for which the optimum nano-silica content was determined, i.e. the quantity of nano-silica that resulted on the higher gain of strength. The physical characterization of raw materials was done in terms of particle size distribution, density and specific surface area. Chemical and mineralogical compositions of materials were obtained through fluorescence and X-ray diffraction. The mechanical performance was evaluated by compressive strength, flexural strength and dynamic elastic modulus measurements. The microstructural analysis of mixtures containing nano-silica was performed by X-ray diffraction, thermogravimetry, mercury intrusion porosimetry and scanning electron microscopy. Obtained results indicate an optimum content of nano-silica of 0.62 wt%, considering compressive and flexural strengths. This performance improvement was directly related to two important microstructural aspects: the packing effect and pozzolanic reaction of nano-silica. Keywords: ultra-high strength, nano-silica, mechanical performance, microstructure. silica, the maximum gain on mechanical properties for mixtures formulated with 10 wt% of silica nanoparticles was reported [16]. The flexural strength and elastic modulus present the same tendency for optimum nano-si...

show abstract

Section: Introductionsupporting

confidence: 51%

“…In [8], the maximum gain on compressive strength was observed for mixtures containing 2 wt% of nano-silica. The results published in [9] show a maximum gain on compressive strength for mixtures containing 2.82 wt% of nano-silica. In [10][11][12], the optimum content for mixtures containing 3 wt% of nano-silica was observed.…”

Section: Introductionmentioning

confidence: 95%

Effects of nano-silica on mechanical performance and microstructure of ultra-high performance concrete

Mendes

Repette

Reis³

2017

Cerâmica

View full text Add to dashboard Cite

show abstract

“…Using colloidal NS (up to 7.5 % cement replacement) along with high-volume FA (up to 45 %), replaced cement mortars showed equivalent residual strength after exposure to 700°C compared to control cement mortars before exposure to high temperature, whereas slag with 30-60 % replacement of cement in the presence of 4 % mass NS has showed a higher resistance to fire up to 1000°C than all the other composite cement pastes. In a study on the performance of NS-modified high-strength concrete at elevated temperature [45], it was found that the decrease in compressive strength was greater for concrete containing nanosilica heated to 600-800°C compared to SF incorporated concrete. Moreover, focused research on the effect of NS on the performance of concrete at elevated temperatures is limited.…”

Section: Introductionmentioning

confidence: 98%

Effect of high temperature on the properties of ternary blended cement pastes and mortars

Maheswaran

Iyer

Palani

et al. 2015

J Therm Anal Calorim

View full text Add to dashboard Cite

This paper presents experimental study to investigate the effect of high temperature up to 800°C on the properties of ternary blended Portland cement, lime sludge (LS), a residual solid from paper and pulp industry, with silica fume (SF) and nanosilica (NS). Physicochemical properties and mechanical behavior of ternary blended cement are studied. The replacement of cement by LS is fixed throughout as 20 % except control paste/mortar. In addition to the replacement of LS, SF by 3 and 6 % and NS by 1.5 and 3 % are incorporated in cement paste and mortar. The phase changes due to the thermal effect of all the 28-day water-cured composite pastes are monitored by XRD and thermal analysis by TG-DTG. Unstressed residual compressive strength tests are used in this study for the mortars. Results show that the incorporation of LS-SF cement composites with cement replacement level up to 26 % increases the compressive strength significantly at ambient temperature as well as after 2-h exposure to 500°C compared to control mortars, but spalling of mortars occurs at 800°C after 28 days of water curing. In the case of LS-NS cement composites, the residual compressive strength reduces considerably at all the temperatures, but there is no occurrence of spalling.

show abstract

“…For example, after exposed to 400°C, the mass loss was 5.83% for concrete M1. However, for concrete with compressive strength of 85.06 MPa exposed to 400°C for 1 h, the average mass loss of the concrete was 3.54% [25].…”

Section: Effect Of Elevated On the Mass Loss Of Concretementioning

confidence: 99%

The use of surface coating in enhancing the mechanical properties and durability of concrete exposed to elevated temperature

Yuan

2015

Construction and Building Materials

View full text Add to dashboard Cite

Performance of nano-Silica modified high strength concrete at elevated temperatures

Cited by 132 publications

References 14 publications

Effects of nano-silica on mechanical performance and microstructure of ultra-high performance concrete

Effects of nano-silica on mechanical performance and microstructure of ultra-high performance concrete

Effect of high temperature on the properties of ternary blended cement pastes and mortars

The use of surface coating in enhancing the mechanical properties and durability of concrete exposed to elevated temperature

Contact Info

Product

Resources

About