Influence of nano-silica and nano-alumina in lime-pozzolan and lime-metakaolin binders

2017 ◽  
Vol 4 (7) ◽  
pp. 6908-6922 ◽  
Author(s):  
Maria Stefanidou ◽  
Eirini- Chrysanthi Tsardaka ◽  
Eleni Pavlidou
Keyword(s):  
Nano Silica ◽  
Nano Alumina

scholarly journals Elevated Temperature Effects on the Properties of Self Compacting Mortar Containing Nano Materials and Zircon Sand

2021 ◽  
Author(s):  
Sahaya Ruben ◽  
Raja MA ◽  
SOPHIA M
Keyword(s):  
Elevated Temperatures ◽  
Research Work ◽  
Nano Particles ◽  
Nano Materials ◽  
Nano Silica ◽  
Positive Effects ◽  
Nano Alumina ◽  
Negative Effect ◽  
Combined Action ◽  
Zircon Sand

Abstract The present research work tries to assess the performance of self compacting mortar containing zircon sand as substitute for river aggregate in combination with nano alumina and nano silica as additive for cement. The fresh state results as observed through slump cone and mini V funnel showed positive effects of zircon sand balancing the negative effect of nano particles addition on workability. The mechanical properties, durability and microstructure of the mortar were assessed by conducting experiments at normal temperature and after subjecting to temperatures of 2000C, 4000C, 6000C and 8000C. The results indicate that addition of nano alumina and nano silica contributed towards the mechanical strength enhancement at elevated temperatures in combination with zircon sand which is a very good refractory material. The durability of the self compacting mortar at elevated temperatures enhanced due to the combined action of nano materials and zircon sand which is evident through microstructure analysis.

scholarly journals Effect of Nano-Additives on the Strength and Durability Characteristics of Marl

Minerals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1119
Author(s):  
Mehdi Mirzababaei ◽  
Jafar Karimiazar ◽  
Ebrahim Sharifi Teshnizi ◽  
Reza Arjmandzadeh ◽  
Sayed Hessam Bahmani
Keyword(s):  
Bearing Capacity ◽  
Carbon Dioxide Emissions ◽  
Soil Stabilization ◽  
Nano Silica ◽  
High Carbon ◽  
Volume Changes ◽  
Nano Alumina ◽  
Nano Additives ◽  
Strength And Durability ◽  
High Carbon Dioxide

Low bearing capacity soils may pose serious construction concerns such as reduced bearing capacity and excessive hydro-associated volume changes. Proper soil remediation techniques must be planned and implemented before commencing any construction on low bearing capacity soils. Environmentally friendly soil stabilizers are gradually replacing traditional soil stabilizers with high carbon dioxide emissions such as lime and cement. This study investigated the use of an alternative pozzolanic mix of nano-additives (i.e., nano-silica and nano-alumina) and cement to reduce the usage of cement for achieving competent soil stabilization outcomes. A series of unconfined compressive strength (UCS), direct shear, and durability tests were conducted on marl specimens cured for 1, 7, and 28 days stabilized with nano-additives (0.1~1.5%), 3% cement, and combined 3% cement and nano-additives. The UCS and shear strength of stabilized marl increased with nano-additives up to a threshold nano-additive content of 1% which was further intensified with curing time. Nano-additive treated cemented marl specimens showed long durability under the water, while the cemented marl decomposed early. The microfabric inspection of stabilized marl specimens showed significant growth of calcium silicate hydrate (CSH) products within the micro fabric of nano-silica treated marl with reduced pore-spaces within aggregated particles. The results confirmed that nano-additives can replace cement partially to achieve multi-fold improvement in the strength characteristics of the marl.

Effect of Nanoparticles on Strength and Durability Properties on Cement Mortar

2016 ◽  
Vol 857 ◽  
pp. 65-70 ◽  
Author(s):  
P. Prathebha ◽  
Santhappan Aswini ◽  
J. Revathy
Keyword(s):  
Ferric Oxide ◽  
Cement Mortar ◽  
Cementitious Materials ◽  
Nano Particles ◽  
Nano Silica ◽  
Chloride Permeability ◽  
Split Tensile Strength ◽  
Durability Properties ◽  
Nano Alumina ◽  
Strength And Durability

The nanotechnology provides an impact on construction industry materials with new properties and produce material with better performance. This paper presents the experimental investigation on the effects of nano particles incorporated in the cementitious materials to study the strength and durability properties of cement mortar. Nano particles such as nano alumina (NA), nano ferric oxide (NF) and nano silica (NS) were mixed at different proportions of 0.5%, 1% and 1.5% by weight of binder in single and binary combinations. Mechanical properties such as compressive strength and split tensile strength; durability properties such as water absorption and rapid chloride permeability test were tested as per standards. The results showed that 1.5% of the combination of nano silica & nano ferric oxide (NSF) and nano silica & nano alumina (NSA) particles increased the mechanical strength and durability properties of cement mortar. The microstructure characteristics results revealed that the nano particles incorporated cementitious materials showed the voids were filled up with nano particles. It acts as filler in cement mortar that enhanced a dense microstructure, reduced the quantity and size of calcium hydroxide and also filled the voids of C-S-H gel structure.

scholarly journals Aggressive Environment Resistance of Concrete Products Modified With Nano Alumina and Nano Silica

2021 ◽  
Vol 8 ◽  
Author(s):  
Yao Zhao ◽  
Na Cui ◽  
Shuyuan Zhao ◽  
Yunzhe Zhu ◽  
Pengkun Hou ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Dynamic Modulus ◽  
Hydration Products ◽  
Nano Silica ◽  
Environmental Resistance ◽  
Freeze Thaw ◽  
Aggressive Environment ◽  
The Past ◽  
Nano Alumina ◽  
Durability Of Concrete

The service life of concrete products with exposure to an aggressive environment has raised great concerns in the past decades. Nanomaterials have been used as a promising approach to improve the environmental resistance of concrete products when exposed to synergistic attacks. The impacts of CaCl2 on nano-modified concrete, especially along with freeze/thaw (F/T) and wet/dry (W/D) cycles, were barely discussed. In this study, the impacts of CaCl2 along with F/T and W/D cycles on the nano SiO2 and Al2O3 modified concrete were investigated. The mass loss, flexural strength, compressive strength, and relative dynamic modulus of elasticity were tested to evaluate the durability of concrete products. The testing results indicate that the addition of nanoparticles has a distinctive effect on the environment resistance enhancement of concrete samples. The microstructure analysis demonstrates that with the addition of nanoparticles, high-density hydration products were formed, which is beneficial to the properties enhancement of concrete products. This study not only provides an approach to realize the nano modification on the durability of concrete products but also helps to design and fabricate environmentally resistant concrete products when exposed to a synergistic aggressive environment.

scholarly journals Enhanced sorption of Cu (II) ions from aqueous solution by ionic liquid impregnated nano-silica and nano-alumina particles

2017 ◽  
Vol 23 (2) ◽  
pp. 207-216 ◽  
Author(s):  
Nilay Gizli ◽  
Merve Arabacı
Keyword(s):  
Ionic Liquid ◽  
Aqueous Media ◽  
Sorption Isotherms ◽  
Morphological Characterization ◽  
Impregnation Method ◽  
Sonication Time ◽  
Nano Silica ◽  
Nano Alumina ◽  
Alumina Particles ◽  
Loading Ratio

In this study, the improvement of the Cu (II) ion sorption performance of nano- -silica and nano-alumina particles was investigated by the impregnation of 1-ethyl-3-methyl imidazolium bis(trifluorosulfonyl)imide [Emim+Tf2N-] ionic liquid (IL). The immobilization process of IL was achieved via the ultrasound-assisted physical impregnation method. The structural and morphological characterization of the adsorbents was investigated by Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM) analysis. The thermal stability of the ionic liquid impregnated nanoparticles was also characterized by thermogravimetric analysis (TGA). The effect of the loading ratio (LR) and the sonication time (tD) on the sorption performance of the modified nanoparticles were investigated. The efficient adsorption was obtained by using the particles containing IL at the loading ratio (mL-IL/g-part) of 0.5:1. And the optimum value for the sonication time was chosen as 15 min in ethanol media. The sorption performances of the nanoparticles were enhanced by impregnation up to 92% in the aqueous media. The sorption equilibrium behaviour of the modified nanoparticles was also evaluated. The experimental data indicated that the equilibrium behaviour was in line with the Langmuir sorption isotherms.

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