Investigation of nano-alumina on the effect of durability and micro-structural properties of the cement mortar

2017 ◽  
Vol 4 (11) ◽  
pp. 12191-12197 ◽  
Author(s):  
Raje Gowda ◽  
H. Narendra ◽  
B.M. Nagabushan ◽  
Dinesh Rangappa ◽  
R. Prabhakara
Keyword(s):  
Structural Properties ◽  
Cement Mortar ◽  
Nano Alumina

Incorporation of Iraqi Rocks in the Production of Eco-Friendly Cement Mortar

2020 ◽  
Vol 38 (10A) ◽  
pp. 1522-1530
Author(s):  
Rawnaq S. Mahdi ◽  
Aseel B. AL-Zubidi ◽  
Hassan N. Hashim
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Water Absorption ◽  
Structural Properties ◽  
Mechanical Milling ◽  
Cement Mortar ◽  
Cement Mortars

This work reports on the incorporation of Flint and Kaolin rocks powders in the cement mortar in an attempt to improve its mechanical properties and produce an eco-friendly mortar. Flint and Kaolin powders are prepared by dry mechanical milling. The two powders are added separately to the mortars substituting cement partially. The two powders are found to improve the mechanical properties of the mortars. Hardness and compressive strength are found to increase with the increase of powders constituents in the cement mortars. In addition, the two powders affect water absorption and thermal conductivity of the mortar specimens which are desirable for construction applications. Kaolin is found to have a greater effect on the mechanical properties, water absorption, and thermal conductivity of the mortars than Flint. This behavior is discussed and analyzed based on the compositional and structural properties of the rocks powders.

Comparative Study of the Properties of Cement Pastes Modified with Nano-Silica and Nano-Alumina

2019 ◽  
Vol 286 ◽  
pp. 133-144 ◽  
Author(s):  
Evangelia Tsampali ◽  
Eirini Chrysanthi Tsardaka ◽  
Eleni Pavlidou ◽  
Konstantinos M. Paraskevopoulos ◽  
Maria Stefanidou
Keyword(s):  
Structural Properties ◽  
Building Materials ◽  
Reference Sample ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
High Concentration ◽  
Cement Pastes ◽  
Nano Alumina ◽  
Cementitious Systems ◽  
Positive Effect

This paper presents the effect of adding nanoparticles SiO2 and Al2O3 in the cement with respect to mechanical, physical and structural properties. Nanoparticles were chosen for the development of nanocomposite building materials with high mechanical strength, durability and low permeability. Correspondingly, the cement used is Portland Cement CEMI42.5N. Five compositions have been prepared, a reference sample (OPC) and pastes with different nanoparticles. Nanoparticles of SiO2 and Al2O3 were added in 1.5% and 3% by weight of cement and the produced samples were tested after 7, 28, 90 and 120 days of curing. All the samples, in every hydration period, were tested for compressive strength, while their open porosity was measured and their microstructure was examined by means of infrared spectroscopy. Furthermore, for certain hydration periods, the chemical and elemental composition of the samples was evaluated by means of X-ray diffraction and scanning electron microscopy. The samples were also evaluated for capillary water absorption and shrinkage, while thermal analysis was performed for specific samples. The comprehensive analysis revealed a positive effect, in terms of structural properties, of nanoparticle admixture in cementitious systems. The addition of nanoparticles influence the workability of the composites and contributes to the formation of crystallization nuclei, which in turn enhance the durability of the material. Interestingly, it was found that high concentration of nanoAl2O3 in the admixure, results in high mechanical properties. Highlights: Different analytical techniques were combined in order to holistically test nanomodified cement pastes. nanoalumina is systematically tested as additive in cement pastes.

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.

M-Sand cement mortar with partial replacement of alpha phase nano alumina

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Alexander Gladwin Alex ◽  
Tsegay Gebrehiwet ◽  
Zeyneb Kemal
Keyword(s):  
Cement Mortar ◽  
Alpha Phase ◽  
Partial Replacement ◽  
Nano Alumina

scholarly journals Compressive Strength of Cement Mortar Modified with Nano-Alumina in Correlation with Different Water-to-Cement Ratios and Curing Periods -A Statistical Analysis

2020 ◽  
Vol 7 (3) ◽  
pp. 79-98
Author(s):  
Muhammed Abdullah ◽  
◽  
Serwan Rafiq ◽  
Keyword(s):  
Compressive Strength ◽  
Mechanical Performance ◽  
Cement Mortar ◽  
Nonlinear Modeling ◽  
Dry Weight ◽  
Coefficient Of Determination ◽  
Cement Ratio ◽  
Curing Period ◽  
Water To Cement Ratio ◽  
Nano Alumina

One promising insight to extended service life of cement mortar and improve it is durability by assimilating nano mechanism into the cement-based materials. Regardless of many research studies on the effect of nano alumina on the mechanical performance of cement mortar, there has not been a widespread study examining the effect of nano Al2O3, curing period (t), and water-to-cement ratio (w/c) on the compressive strength (σc) of cement mortar. Consequently, this study explores the subject matter which could be helpful for the building and construction field. In this study, the data collected on the compressive strength of the cement mortar modified with different percentages of nano alumina ranging from 0.5% to 13.5% (by dry weight of the cement) were gathered from the literature. A nonlinear modeling NLM and statistical data analysis were performed on above 500 assembled data. The w/c ratio of the cement mortar varied from 0.3% to 0.79%, and the compressive strength of cement mortar modified with nano alumina and cured for 1,7 and 28 up to 90 days leads to high strength ranged from (10 MPa to 68 MPa). The result of NLM showed that curing period has the highest effect on the compressive strength in combination with water to cement ratio and percentage of nano alumina replacement with a coefficient of determination (R2) of 0.85.

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