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Effect of nano-particles and aminosilane interaction on the performances of cement-based composites: An experimental study
, Article Construction and Building Materials ; Vol. 66 , 2014 , Pages 113-124 ; ISSN: 09500618 ; Hosseinpourpia, R ; Pajum, A ; Khodavirdi, M. M ; Izadi, H ; Vaezi, A ; Sharif University of Technology
Abstract
The aim of the present study was to experimentally investigate the interaction between a low replacement ratio of different nano-particles (SiO2, Al2O3, clay, and CaCO3) and aminosilane in the matrices of cement paste and mortar. Results showed that the optimum content of aminosilane for improving the 28-day compressive strength of cement mortar was 0.75% (by weight of the total binder). The utilization of nano-SiO2 and nano-clay particles improved the strengths of the cement mortar containing hybrid systems of nano-particles/aminosilane at early (7 days) and middle curing ages (28 and 91 days). The 28-day compressive strength enhancement of cement mortar with hybrid systems of nano-SiO...
Experimental Studies on Mechanical Properties of Cement Mortar Including Nano Alumina and Nano Silica
, M.Sc. Thesis Sharif University of Technology ; Joghataie, Abdollreza (Supervisor)
Abstract
Due to the diameter and size of nanoparticles, they have been applied in various fields to make materials with better properties. In this thesis, the purpose has been to investigate the influence of nano alumina and nano alumina incorporating nano silica particles on mechanical properties of cement mortars. Different portions of nano alumina that include 1, 3, and 5% have been used. Nano silica with 1 and 2% has been used. At first, nano particles were dispersed by sonication with water, and then the cement mortars with various percent of nano additives with the same workability have been made. After different curing periods (7, 28 days), the specimens have been tested for bending and...
A study on the cementitious mortars containing multi-walled carbon nanotubes and nanographene
, Article Journal of Testing and Evaluation ; Volume 51, Issue 2 , 2022 ; 00903973 (ISSN) ; Toufigh, V ; Sharif University of Technology
ASTM International
2022
Abstract
In this paper, the effects of the multi-walled carbon nanotubes (MWCNTs) and nanographene (GP) on the mechanical performance of the cementitious mortars were investigated in different environments. Six mix designs were fabricated by considering the previous studies and exposed to potable water, acidic, and alkaline environments. The GP and MWCNTs partially replaced the cement with 0.25 %, 0.5 %, and 1 % of its weight. The standard mechanical tests, X-ray diffraction (XRD), and scanning electron microscope (SEM) analysis were performed on the specimens. The results indicated that including the MWCNTs and GP increases the compressive strength by 10 % and 20 % and similarly improves the tensile...
Analytical and Experimental Studies on Interface between Different Mortars and Brick
, M.Sc. Thesis Sharif University of Technology ; Toufigh, Vahab (Supervisor)
Abstract
Usage of masonry materials in a country like Iran is still significantly high. As most of the failures during an earthquake in this system is failure caused by low ductility of cement mortars and also the high rate of carbon dioxide produced by cement. Experiences of Kermanshah earthquake in 2017 in Iran has doubled the importance of this issue. Hence, in the present investigation, an attempt to enhance the shear bond characteristics of structures constructed by masonry using green materials has been made. “Taftan” natural Pozzolan and two types of rice husk ash (RHA) was used in mix design of used mortars as a green material. In this investigation, a direct shear test (DST) device is...
Influence of nano-SiO2 addition on microstructure and mechanical properties of cement mortars for ferrocement
, Article Transportation Research Record ; Issue 2141 , 2010 , Pages 15-20 ; 03611981 (ISSN) ; Booshehrian, A ; Farshchi, S ; Sharif University of Technology
Abstract
Because of their unique physical and chemical properties, nanoparticles have been gaining increasing attention and have been used in many fields to fabricate new materials with novel functions. If nanoparticles are integrated with cement-based building materials, the new materials might possess some outstanding properties. Ferrocement is a type of thin-wall reinforced concrete commonly constructed of hydraulic cement mortar reinforced with closely spaced layers of continuous and relatively small-sized wire mesh. The low level of technical skill required to make ferrocement and the ready availability of its materials make ferrocement suitable for a wide variety of applications. This study...
On the parameters influencing chemo-physical properties of rice husk ash and its performance in cement mortars
, Article Proceedings, Annual Conference - Canadian Society for Civil Engineering ; Volume 2 , 2011 , Pages 1248-1255 ; 9781618392183 (ISBN) ; Khaloo, A. R ; Nasir, S ; Sharif University of Technology
2011
Abstract
One of the most conventional and energy efficient methods to improve the engineering properties of concrete is the utilization of waste materials and by-products. Among agricultural wastes, rice husk ash (RHA) has exhibited the greatest potential to enhance the characteristics of cement mixtures. However, the investigations on the properties and performance of RHA are slim compared to its potential advantages and few systematic studies can be found in the literature regarding parameters influencing the chemo-physical and microstructural characteristics of RHA along with its performance in cement mixtures. In this study, the effect of retention time of rice husk is systematically...