Impact of Nano Silica On Mechanical Properties of Concrete Using Optimised Dosage of Nanosilica As A Partial Replacement of Cement

In the current scenario nanotechnology and nanomaterials are emerging as key role in engineering and medical industries. The objective of this research is to increase the usage of fly ash in concrete to enhance the strength properties of concrete mixed with nano silica and to reduce the emission control caused by CO2discharged from cement manufacturing industries. The strength properties of concrete mixture is enhanced with nano size particles filled the voids amoung micron size cement particle, and hence a denser concrete mixture was being attained. Fly ash is used for partial replacement of cement to enhance the environmental sustainability and to reduce the cost. This research work focussed on preparation of nano silica mixed concrete with replacement of fly ash in concrete mixture. Nano silica was added in addition to the above by 1% and 2% to improve the overall strength properties. Different experimental analysis were carried out to obtained the results such as compression strength, ultimate divide tensile strength and elastic modulus of the enriched concrete mixture. From the observed results it was found that, compression strength was increased by adding 1% nano silica and 25% of fly ash and also increased the ultimate tensile strength by 28%. Scanning Electrom Microscope (SEM) results reveal that, the incorporation of the nano silica in concrete increases the mechanical properties and porosity was successfully minimized with enhancement of pore size distribution.

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Mechanical Properties of Crumb Rubber Mortar Containing Nano-Silica Using Response Surface Methodology

Materials ◽

10.3390/ma14195496 ◽

2021 ◽

Vol 14 (19) ◽

pp. 5496 ◽

Cited By ~ 1

Author(s):

Syafiqah Shahrul ◽

Bashar S. Mohammed ◽

M. M. A. Wahab ◽

M. S. Liew

Keyword(s):

Mechanical Properties ◽

Response Surface Methodology ◽

Response Surface ◽

Impact Resistance ◽

Crumb Rubber ◽

Partial Replacement ◽

Nano Silica ◽

The Sustainable Development ◽

Fine Aggregates ◽

Breeding Grounds

Crumb rubber (CR) from scrap tires is used as a partial replacement of fine aggregates in cement paste. This promotes the sustainable development of the environment, economy, and society, as waste tires are non-biodegradable and flammable. They occupy large landfill areas and are breeding grounds for mosquitoes and rodents. Inclusion of CR in mortar leads to several improvements on the mixture properties such as ductility, toughness, and impact resistance. However, it exhibits lower strengths and Modulus of Elasticity (ME). Therefore, to promote the use of mortar containing CR, it is vital to improve its mechanical strength. Past studies proved that nano-silica (NS) improves the strength of concrete due to the physico-chemical effects of NS. This study aims to examine the mechanical properties of crumb rubber mortar containing nano-silica (NS-CRM) and to develop models to predict these properties using Response Surface Methodology (RSM). Two variables were considered, CR as partial replacement to sand by volume (0%, 7.5%, 15%), and NS as partial replacement to cement by weight (0%, 2.5%, 5%). The results demonstrated a significant improvement in the mechanical properties of CRM when incorporating NS, and the models developed using RSM were acceptable with a 2% to 3% variation.

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Investigation of the efficacy of nano-silica on mechanical properties of Green-Engineered Cementitious Composite (GECC) containing high volume natural zeolite

Construction and Building Materials ◽

10.1016/j.conbuildmat.2021.123246 ◽

2021 ◽

Vol 291 ◽

pp. 123246

Author(s):

Seyed Mohammadhossein Razavi ◽

Hadi Nazarpour ◽

Morteza Hosseinali Beygi

Keyword(s):

Mechanical Properties ◽

Natural Zeolite ◽

High Volume ◽

Cementitious Composite ◽

Nano Silica ◽

Engineered Cementitious Composite

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Effectiveness on mechanical properties of m60 grade scc with partial replacement of cement by different mineral admixture like ggbs, lime powder and metakaolin at various percentages

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1091/1/012026 ◽

2021 ◽

Vol 1091 (1) ◽

pp. 012026

Author(s):

Polampally Vinod kumar ◽

Dr. G.V.V Satyanarayana

Keyword(s):

Mechanical Properties ◽

Mineral Admixture ◽

Partial Replacement ◽

Lime Powder

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Experimental investigation on mechanical properties of M20 and M40 grade concrete with partial replacement of M sand and crumb rubber as fine aggregate and fly ash for cement

10.1063/5.0057983 ◽

2021 ◽

Author(s):

M. Sri Harsha Varma ◽

G. V. V. Satyanarayana ◽

P. Shanthi Raj

Keyword(s):

Mechanical Properties ◽

Experimental Investigation ◽

Fly Ash ◽

Crumb Rubber ◽

Partial Replacement ◽

Fine Aggregate

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Recent Attempts in the Design of Efficient PVC Plasticizers with Reduced Migration

Materials ◽

10.3390/ma14040844 ◽

2021 ◽

Vol 14 (4) ◽

pp. 844

Author(s):

Joanna Czogała ◽

Ewa Pankalla ◽

Roman Turczyn

Keyword(s):

Mechanical Properties ◽

Partial Replacement ◽

Total Replacement ◽

Current Trends ◽

Poly Vinyl Chloride ◽

Wide Range ◽

Migration Resistance ◽

Secondary Plasticizer ◽

New Compounds ◽

Ethylhexyl Phthalate

This paper reviews the current trends in replacing commonly used plasticizers in poly(vinyl chloride), PVC, formulations by new compounds with reduced migration, leading to the enhancement in mechanical properties and better plasticizing efficiency. Novel plasticizers have been divided into three groups depending on the replacement strategy, i.e., total replacement, partial replacement, and internal plasticizers. Chemical and physical properties of PVC formulations containing a wide range of plasticizers have been compared, allowing observance of the improvements in polymer performance in comparison to PVC plasticized with conventionally applied bis(2-ethylhexyl) phthalate, di-n-octyl phthalate, bis(2-ethylhexyl) terephthalate and di-n-octyl terephthalate. Among a variety of newly developed plasticizers, we have indicated those presenting excellent migration resistance and advantageous mechanical properties, as well as those derived from natural sources. A separate chapter has been dedicated to the description of a synergistic effect of a mixture of two plasticizers, primary and secondary, that benefits in migration suppression when secondary plasticizer is added to PVC blend.

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Physical and Mechanical Properties of Cement Paste Were Used Partially with Fly Ash and Kaolin Waste

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.866.199 ◽

2017 ◽

Vol 866 ◽

pp. 199-203

Author(s):

Chidchanok Chainej ◽

Suparut Narksitipan ◽

Nittaya Jaitanong

Keyword(s):

Mechanical Properties ◽

Fly Ash ◽

Room Temperature ◽

Physical And Mechanical Properties ◽

Partial Replacement ◽

X Ray Diffraction ◽

X Ray ◽

Lime Water ◽

Diffraction Patterns ◽

Iron Mold

The aims of this research were study the microstructures and mechanical properties for partial replacement of cement with Fly ash (FA) and kaolin waste (KW). Ordinary Portland cement were partially replaced with FA and KW in the range of 25-35% and 10-25% by weight of cement powder. The kaolin waste was ground for 180 minutes before using. The specimen was packing into an iron mold which sample size of 5×5×5 cm3. Then, the specimens were kept at room temperature for 24 hours and were moist cured in the incubation lime water bath at age of 3 days. After that the specimens were dry cured with plastic wrap at age of 3, 7, 14 and 28 days. After that the compounds were examined by x-ray diffraction patterns (XRD) and the microstructures were examined by scanning electron microscopy (SEM). The compressive strength was then investigated.

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