Short Term V/S Long Term Optimizations of Nano-Additions on Ordinary Portland Cement (original) (raw)

A STUDY ON APPLICABILITY ASPECTS OF NANO MATERIALS IN CEMENT-CONSTRUCTION

A broad range of challenges faced by the construction industry today deals with both the short term & long term effects of new material use in cement. This paper aims to explore the fact that that small addition of nano particles viz. Nanosilica (nS), Carbon Nanotubes (CNT) & Nano Titanium Oxide (TiO 2) in ordinary Portland cement have enhanced both the short term & medium term strength of cement mortar when added in optimized quantities with respect to the weight of cement & water added as per the normal standard consistency formula of the Indian standards. However, in the long term (90 days & above) it is seen that with increase in the quantities of all the nanoparticles from the optimized one to a bit little further, further increases the same. With the increase of the optimized nS to 1% showed a strength gain of more than 12% and 8% at 180 days and 365 days and with the increase from optimized CNTs to 0.1% saw a strength gain of more than 23% at 180 days and 69.21% at 365 days. However, increased addition of optimized TiO 2 w.r.to its optimized quantity did not serve any better results.

Application of Nanomaterials on Cement Mortar and Concrete A Study

Nanomaterials--a topic of contemporary research--has vast applications in all research areas starting from semiconductors to energy to textiles to construction. Recent investigations showed that small addition of nanoparticles, viz., Nanosilica (nS), Carbon Nanotubes (CNT) and Nano Titanium Dioxide (TiO2), have enhanced the 28-day strength of cement mortar when added in optimized quantities, and the same optimization when repeated for concrete produced good results. However, their long-term strength differs due to the poor control of the degree of freedom of their valence electron, i.e., nanomaterials tend to get oxidized in the long run. In this paper, a technical comparison of the 28-day and long-term mechanical strength of the nanoadditions to cement mortars is made with reference to ordinary controlled cement mortars and also when the same optimization is applied for nanoconcrete with reference to controlled concrete at 28 days.

Application of Nano Materials on Cement Mortar & Concrete

Nanomaterials-a topic of contemporary research has vast applications in all research areas starting from semi conductors to energy to textiles to construction. Recent investigations showed that small addition of nano particles viz. Nanosilica (nS), Carbon Nanotubes (CNT) & Nano Titanium Oxide (TiO 2) have enhanced the 28 day strength of cement mortar when added in optimized quantities and the same optimization when repeated for concrete produced good results. However, their long term strength differs due to the poor control of the degree of freedom of their valence electron i.e nano materials tend to get oxidized in the long run. In this paper, we report a technical comparison of the 28 day & long term mechanical strength of the nano additions to cement mortars w.r.to ordinary controlled cement mortars and also when the same optimization is applied for nano concrete w.r.to controlled concrete at 28 days.

Effect of Nanomaterial in Cement Hydration Process

2015

Nano Technology is one of the areas which is gaining prominence in the field of Civil Engineering. Application of the concepts of nano technology is steadily growing. Materials at nano stage results in new materials which can change the entire property of the composites to which nano materials are added. Literature reveals that nano particles enhance the strength and durability of concrete . Studies on nano particles added cement paste indicate that stronger and durable concrete can be made by adding particles at nano scale to concrete. At present, many investigations are being carried out to understand the hydration of nano sized cement particles and the use of nano-size ingredients such as alumina, fly ash and silica particles for production of concrete. During the present study, an attempt has been made to understand the influence of nano materials on the hydration of cement by conducting consistency, setting time and strength of cement mortar. This report gives a brief introduct...

Use of Nanomaterials in Cementitious Systems

Proceedings of 2nd International Conference on Engineering & Agricultural Science, 2020

Nanomaterials are advanced materials derived from nanotechnology which can address much of the present-day world's problems if used in optimum quantities. Be it electronics, medicines, IT, water-purification, textiles, cosmetics, mobiles, computers, health-care products nanotechnology are ruling the roost. This Paper discusses the effect of adding nanomaterials in cement-sand mortar at various dosages by weight of cement(b.w.c.) at different ages starting from short term to long term via. medium term. Comparing the results of nano-additive cement mortars with that of ordinary cement mortars it has been found that nano-additions has resulted in a higher strength gain.

Studying the effects of Polymeric nanomaterial additions in Cement composites

Journal of Advanced Materials & Applications, 2018

Nanomaterials as studied today are a set of advanced materials which have unique properties and can better the existing behaviors of normal cement concretes. Nanomaterials exist in entangled mass like form which are insoluble in water and therefore are dis this paper an attempt is made to study the effects of Nanomaterials like Carbon Nanotubes (CNT) and Nano Titanium Dioxides (TiO2) for various proportions ranging from 0.02%, 0.05% and 0.1% of cement CNT & 1% & 2.5% of cement weight for TiO mortar mix in mortar cubes of 70.7 mm dimensions, taking cement: sand=1:3 by weight, keeping the water cement(w/c) ratio fixed at 0.4.The Indian codal stipulations of IS:4031. The mechanical testing of the cubes is done in laboratory scale under ordinary curing conditions at 7days, 28 days, 90 days, 180 days & 365 days Keywords: Cement, Concrete, Days, Nanomaterials, Test, Water

Application of Nanomaterials in Cementitious Systems

Engineering and Scientific International Journal, 2020

Nanomaterials are advanced materials derived from nanotechnology which can address much of the present-day world's problems if used in optimum quantities. Nanotechnology is ruling in electronics, medicines, water-purification, textiles, cosmetics, mobiles, computers and health-care fields. This Paper focus on the effect of adding nanomaterials in cement-sand mortar at various dosages by weight of cement at different ages starting from short term to long term via. medium term. Comparing the results of nano-additive cement mortars with that of ordinary cement mortars it has been found that nano-additions has resulted in a higher strength gain.

A CASE STUDY ON THE PERFORMANCE BASED ENHANCEMENT OF CEMENTITIOUS SYSTEMS THROUGH SUSTAINABLE NANOMATERIAL

IABSE-Journal March 2024(The Bridge & Structural Engineer)), 2024

This study concerns the application of a water-saving cement additive that can appreciably better the hardened properties of a cured product of a cementitious composition over a long time period. This advanced cement additive is a Nanotechnology based advanced material also known as Nano Materials at varying dosages by weight of ordinary Portland cement (1 part by weight) in a dry mix with river sand consti t ut i ng 3 parts by weight of cement . Nanomaterials are insoluble in water so it’s dissolved in a polymeric compound of Polycarboxylate Ether through ultrasonication.7.07cm cubes are cast with this mixture with water adjoined as per IS:4031 Standards under the fixed water/cement(w/c) at 0.4. After casting the cubes are cured at room temperature and they are tested for 3 Days, 7 Days, 28 Days, & 365 Days for compressive strength. Not only the results when compared are found to be superior to that of the ordinary cement composite cubes but also were found to be much more economical when compared to Silica Fumed cement compositions.

APPLICABILITY & DURABILITY ISSUES OF NANOMATERIALS IN CEMENT

Nanomaterials due to their smaller size exhibits many novel properties which may be absent in their conventional bulk material sizes. Cement is the most standard material among all of the materials used in cement concrete constructions and is the only binding medium. This Paper brings out the various beneficial aspects of nanomaterials when they are applied in ordinary cement mortar. Nanomaterials viz. NanoSilica (nS), Carbon Nanotubes (CNT) and Nano Titanium Dioxides (n-TiO 2) are non-virgin materials but when applied to a virgin cement medium like OPC not only enhances the mechanical properties but also increases the volume stability of cement-mortars to larger extent.Geo-polymers which are very low workability binders having no cement content, has their workability enhancement with nanomaterials. INTRODUCTION What a 'Nano' is? Is it 'Tata-Nano'? Could anyone tell why it is called 'Nano'? These are the pertinent questions which come into everyone's mind when they hear about anything called 'Nano'. 'Nano' as it aptly called, is so as it was the world's smallest car invented till now. That was the marketing side of 'Nano' but this Paper discusses the scientific part of it as applied in cement constructions. 'Nano' is a Greek word which means 'dwarf' having dimensions in the order of 10-9 m.Nearly fifty years ago, Richard Feynman who is nicknamed as Albert Einstein-II of this century, is also known as the father of nanotechnology-the technology involving the manufacturing and manipulation of atoms. The construction industry was the only industry to identify nanotechnology as a promising emerging technology in the UK Delphi Survey in the early 1990s… (" Application of Nanotechnology in Construction " , Materials and Structures, 37, 649 (2004), Springer).But now other industries like tyres, paints, medicines etc have paced ahead lagging construction industry behind. With the oncoming of the 4th industrial revolution as explored by Professor Klaus Schwab, Founder and Executive Chairman, World Economic Forum, also brings up the huge promise of the potentiality of nanotechnology and nanomaterials. Use of CNTs [4][5][20],have produced remarkable improvements in the mechanical properties of cement concrete on account of their crack bridging effects at the nano scale[7] and nucleation effects in the formation of different cement hydrates[6][17] and have replaced the state-of-the-art technologies using fibers which mainly includes steel bars[18], steel fibers[8][14][20],glass fibers[2][12],carbon fibers[24],polypropylene fibers[1][10],and various others[3].Literatures [9],[11],[13],[15],[16][21]&[22] are abound highlighting the importance of nano additions in cement concrete.

Estimation of the Mechanical Response of Nano Materials in Cement Concrete – A Study

2017

Nanomaterials are a product of one of the truly revolutionary enabling technologies invented by mankind. Nanotechnology as it is appropriately called, can add up to the value of all products including cement concrete through these nanomaterials. In this paper optimized quantity of nanomaterials viz.Nano Silica (nS) and Carbon Nanotubes (CNT) are used to study the mechanical response of a standard M-40 Grade concrete. optimization of Nano-Silica (nS) and Carbon Nanotubes (CNT) for various proportions ranging from 0%, 0.5%, 0.75%, 1.0%, 1.25%, 1.5% of cement weight for nS and 0%, 0.02%, 0.05% and 0.1% of cement weight for CNT is carried out using ordinary Portland cement mortar mix in mortar cubes of 70.7 mm dimensions, taking cement: sand=1:3 and adding water as per the standard consistency formula P’=(P/4 +3) (1 part Cement+3parts Sand). Here P’=Quantity of water and P=Consistency of Cement used, as per Indian codal stipulations and mechanical testing of the cubes are done in labora...