NANOTECHNOLOGY IN CELLULAR LIGHTWEIGHT CONCRETE

2014

Development of technology and human's access to nanotechnology brings about the necessity to use nanotechnology in the concrete industry. Since the decrease of particles size leads to new and unusual mechanical, electrical, and magnetic properties which are inaccessible in usual state, nanotechnology is highly considered. The emergence of nanotechnology in concrete industry has made great changes in many of the concrete properties. Dead load resulted from weight of ceilings and separation walls is among the fundamental problems in seismic design and structures implementation especially in tall buildings. Obviously, using the lightweight materials could decrease the dead load, weight of beams, columns, and foundation. However, low compressive resistance of lightweight concrete mostly has a direct ratio with the specific gravity of it. Lightweight concrete has a low resistance as a result of its low specific weight. Silica nanoparticles (SNs) have a high surface energy as a result...

REVIEW PAPER, 2021

In recent years, the use of nanotechnology materials has increased in strengthening and enhancing the behavior of concrete and its mechanical properties. This is due to the special characteristic of these materials such as its tiny size that considerably improves the microstructure of concrete, which in return gives concrete new properties and dramatically enhances its behavior. The present study seeks to review several previous studies that investigated the effect of adding nano-silica on the mechanical properties, durability, transport properties, and microstructure of lightweight concrete. Based on the results, it has been noted that the addition of nano-silica material has a vital role in improving the properties of lightweight concrete. Moreover, it was observed that there is an increase in the compressive strength, tensile strength, and flexural strength due to the addition of nano-silica material. It has also been concluded that there is an improvement in the durability and transport properties of lightweight concrete.

IOSR Journal of Mechanical and Civil Engineering, 2016

The research mainly focusing on the use of nanomaterials in concrete. Further researchers are continuing to improve the durability and sustainability of concrete and have realized significant increment in mechanical properties of concrete by incorporating nano-silica. The review paper summarizes the effect of nano-silica addition compressive strength on concrete. It provides the current development of application of nano-silica in paste, mortar and concrete. Finally, the future trend/potential and implication of nanosilica in cement-based materials is discussed. A great number of researches have been performed to understand the nature of nanomaterials and their effect on the properties of concrete. A number of Research & Development work dealing with the use of nanomaterials like Nano silica, colloidal Nano Silica (CNS), AlO 3 ,TiO 2 , ZrO 2 ,Fe 2 O 3 , carbon nanotubes (CNT) in cement based materials are discussed in the literature.

The influence of Nano-Silica on various properties of concrete is obtained by replacing the cement with various percentages of Nano-Silica. Nano-Silica is used as a partial replacement for cement in the range of 2.5%, 3%, and 3.5% for M25 mix. Specimens are casted using Nano-Silica concrete. Laboratory tests were conducted to determine the compressive strength, split tensile and flexural strength of Nano-Silica concrete at the age of 7 and 28 days. Results indicate that the concrete, by using Nano-Silica powder, was able to increase its compressive strength. However, the density is reduced compared to standard mix of concrete. The replacement of cement with 3% Nano-Silica results in higher strength and reduction in the permeability than the controlled concrete. The replacement of cement with Nano-Silica more than 3% results in the reduction of various properties of Nano-Silica concrete.

Archives of civil engineering, 2012

Nano technology is an emerging field of interest for civil engineering application. Among the nano materials presently used in concrete, nano-silica possess more pozzolanic nature. It has the capability to react with the free lime during the cement hydration and forms additional C-S-H gel giving strength, impermeability and durability to concrete. Present paper investigates the effects of addition of nano silica in normal strength concrete. Three types of nano-silica in the form of nano suspension having different amount of silica content have been investigated. Mix design has been carried out by using particle packing method. X-Ray diffraction (XRD) analysis has been carried out to find the chemical composition of control concrete and nano modified concrete. Further, experimental investigations have been carried out to characterize the mechanical behaviour in compression, tension and flexure. It has been observed that the addition of nano-silica in normal strength concrete increased the compressive strength and decreased the spilt tensile strength and flexural strength. Also, Rapid chloride permeability test (RCPT) has been conducted to know the chloride permeability of control concrete, nano modified concrete, and nano coated concrete. It has been observed that the chloride permeability is less for nano coated concrete.

2014

The Construction Industry is a major consumer of material and energy sources of India. Among all the materials used in construction, concrete, which is the most widely used, can have a significant impact. Meanwhile, nanotechnology is one of the most influential technologies in this century and it has significantly attracted the construction sector. Better understanding and engineering cementitious material at nanometer scale can result in novel construction materials which are more strong and durable than conventional materials. Engineering concrete at the nanometer scale includes the incorporation of nano sized particles into concrete at suitable proportions and methods. The basic concept behind using nano material which are having large surface area is to improve compressive and flexural strength at early ages, improved hydration characteristics and reduced porosity and water absorption when compared with conventional cementitious materials. Nano materials can also pave the path t...

Zenodo (CERN European Organization for Nuclear Research), 2023

The Durability of Concrete has been vital to all the manufacturer and researchers. The Concrete has been on top always in providing Strength and durability of structures. On other side, we have been facing many challenges like long term Poor Performance, less durable, poor performance against acid and sulphate attack etc. Many researchers are working to improve these drawbacks using nano particles. Nano technology is one of the emerging techniques to improve the mechanical properties of concrete as well as the performance of concrete. The modifications are required to sort out these problems in concrete mass. It has been seen that using nano particles material, the tensile strength, susceptibility to chemical attack, corrosion of reinforcement, low durability has been sorted out up to a good extent. In this study, I have tried to improve mechanical and chemical properties of concrete like Compressive strength, durability, resistive against corrosion, acid attack resistance, workability etc. using Nano Silica material. The target study is to get the best proportion of concrete ingredient added with nano silica and to get the best out come with that proportion in terms of better mechanical and Chemical Properties.

Nano-scale silica or nanosilica is a material at level of individual atoms and molecules in the range of 0.1 to 100 nanometer (10 -6 mm). Adding nano-scale silica fume into concrete mixes improves durability of concrete structures. Understanding enactment that takes place in the cement particle at a nano-scale level can lead to improved industry standard for mixing and curing concrete. Material of nanotechnology product as part of concrete ingredient enables self-consolidating concrete (SCC) of which the concrete may achieve consolidation without the need for vibration and to saving up 50% labor costs. The construction sector can benefit from this new construction material with ultra-high strength, ductility, and high durability, such as steel, polymers, and concrete. The research showed that 2.5% -10% prosentage weight nanosilica to cement's as partial cement substitution increases the mechanics and physics properties of concrete.

The construction industry is a major consumer of material and energy sources in the world. Among all the materials used in construction, concrete, which is the most widely used, can have a si gnificant impact. Meanwhile, nanotechnology is one of the most influential technologies in this century and it has significantly impacted the construction sector. Better understanding and engineering cementitious materials at nanometer scale can result in novel construction materials which are more strong and durable than conventional materials. Engineering concrete at the nano meter scale includes the incorporation of nano sized particles into concrete at suitable proportions and methods. Nano Silica is one such nano material which has shown to enhance the overall performance of concrete. Incorporation of nano Silica at smaller volume fractions has shown to result in higher compressive and flexural strengths at early ages, improved hydration characteristics and reduced porosity and water absorption when compared with conventional cementitious materials. The impacts of other nano materials such as CNTs, nano TiO 2 , nano Al 2 O 3 and nano TiO 2 on concrete are also promising. While nano materials acts as fillers and provide nucleation sites for cement hydration, nano SiO 2 also acts as a pozzolanic material, increasing the amount of stiff CSH within the hydrated cement paste, resulting an improved microstructure. Nanomaterials can also pave the path to reduce the cement content in concrete than in conventional mixes while maintaining same strength characteristics, which will lead into the production of a ' greener' concrete. Numerical models of the composite material validated with experimental results can be used to come up with optimum nano material contents and performance. This paper reviews the efforts, current status and effects of nano modification of cementitious materials and numerically modelling strength properties. These innovative materials will be of high performance and less energy consuming, which will lead towards sustainable construction practices.

Springer, 2021