scholarly journals Strength Properties of Nano Silica Recycled Sustainable Concrete

2019 ◽  
Vol 8 (10) ◽  
pp. 2245-2248
Keyword(s):  
Fly Ash ◽  
Carbon Emission ◽  
Strength Properties ◽  
Mineral Admixture ◽  
Recycled Aggregate ◽  
Nano Silica ◽  
Huge Amount ◽  
Binding Material ◽  
Concrete Production ◽  
Strengthening Factor

This experiment highlights the salient features of concrete under nanotechnology. Concrete production requires huge amount of cement and aggregates which eventually increases carbon emission and contaminates environment. Hence, incorporation of ‘F’ class fly ash which is partially replaced for cement, recycled aggregate and cactus gel can be done which can reduce dumping issues, carbon emission and cost. However, incorporation of fly ash in ordinary Portland cement deviates its strength consequently. Hence, Nano-silica can be added as an additive to fill up the deviation, thereby increasing its workability and improving the strengthening factor of concrete. In this paper mineral admixture such as Nano-silica were used to increase the strength of concrete and natural polymer substances such as cactus jelly is used to increase the workability of concrete. For the binding material cement were replaced with the fly-ash at the percentage of 60% respectively and for the coarse aggregate quarry aggregate has been replaced with recycled aggregate with the proportion of 40% and 60% respectively. In the investigation three specimens were casted say conventional, replacement of 60% and replacement of 60% with Nano silica and cactus extract solution. The result of compressive and flexural strength were compared. The aim of this experiment is to maintain the economy and environmental effect.

scholarly journals STRENGTH AND DURABILITY PERFORMANCE OF FLY ASH BASED GEOPOLYMER CONCRETE USING NANO SILICA

2020 ◽  
Vol 4 (2) ◽  
pp. 1-12
Author(s):  
SAMEER VYAS ◽  
Sameer Mohammad ◽  
Shilpa Pal ◽  
Neetu Singh
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Geopolymer Concrete ◽  
Infrastructure Development ◽  
X Ray Diffraction ◽  
Nano Silica ◽  
Adverse Conditions ◽  
Concrete Production ◽  
Class F Fly Ash ◽  
Strength And Durability

With the increasing infrastructure development across the globe, the demand of cement  production increases day by day. However, the production of cement is associated with the emission of large amount of CO2 causing global warming. Scientist and engineers are in search of a green eco friendly alternative  for concrete production. Geopolymers are rapidly emerging as an alternative to Portland cement as the binder of structural concrete. In this respect, the fly ash based geopolymers  shows considerable prospect for application in concrete industry as an alternative binder to the Portland cement. Development of geopolymer concrete using class F fly ash brings many advantages like; enhancing workability, durability, better strength as well as lowering the price. There is not only a reduction in the greenhouse footprint but, also considerable increase in strength and resistivity to adverse conditions. In order to enhance the performance of Geopolymer concrete, the use of  Nano-silica is  found to be suitable and practiced by researchers.  Use of Nano materials as fillers in the concrete matrix has proven effective in increasing mechanical and durability properties. This research is based on performance evaluation of geopolymer concrete using different percentage of Nano-silica.. It was observed that Geopolymer concrete  with Nano-silica ( GPC-N)  shows good compressive strength as well as  durability under aggressive conditions. The materials performance were also investigated using X-Ray Diffraction technique. (XRD). Results show that the presence of nano silica  enhanced the performance of Geopolymer concrete with respect to strength and durability purposes.  

scholarly journals The Effect of Fly Ash and Recycled Aggregate on the Strength and Carbon Emission Impact of FRCCs

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Jong-Won Lee ◽  
Young-Il Jang ◽  
Wan-Shin Park ◽  
Hyun-Do Yun ◽  
Sun-Woo Kim
Keyword(s):  
Fly Ash ◽  
Carbon Emission ◽  
Recycled Aggregate

A Review Study on the Characterization of Geopolymer Concrete

2019 ◽  
Vol 821 ◽  
pp. 472-478
Author(s):  
Shwan H. Said
Keyword(s):  
Fly Ash ◽  
Sulphuric Acid ◽  
Effect Of Temperature ◽  
Partial Replacement ◽  
Geopolymer Concrete ◽  
High Concentration ◽  
Suitable Alternative ◽  
Binding Material ◽  
Concrete Production ◽  
Alkaline Activator

Ordinary Portland cement (OPC) is the essential binding material to produce the OPC concrete. Production of OPC is recently attaining a rate of 2.6 billion ton per year worldwide and growing 5% annually. OPC contributes at rate of 5 – 8% of human-worldwide CO2 emissions which are the greenhouse gases pollute the atmosphere. Geopolymer concrete (GPC) is a creative, sustainable, economical and eco-friendly material for construction industry, which is a suitable alternative to the OPC concrete, able to extensively curb the CO2 emissions. To prepare this kind of concrete, a combination of pozzolanic material such as fly ash (FA), and/or ground granulated blast furnace slag (GGBS) rich with silica and alumina can react with alkaline activator solution producing aluminosilicate gel, acting as a superb binding material for fine and coarse aggregates under special conditions of curing. This study highlights the recent explorations on geopolymer mortars and concrete. Effect of chemicals such as sulphuric acid, effect of fly ash partial replacement with different binding materials, effect of concentration of alkaline activator solutions and the effect of temperature and time of curing variation have been discussed on durability and mechanical properties of geopolymer concrete. Results have shown superb resistance of geopolymer concrete to the detrimental effects of sulphuric acid on weight and compressive strength. Furthermore, fly ash partial replacement with silica fume, OPC or GGBS, or nanosilica inclusion in GPC has a positive effect on the GPC properties. Finally, using high concentration of sodium hydroxide has a detrimental effect on GPC properties.

scholarly journals Equivalent CO2 Emission and Cost Analysis of Green Self-Compacting Rubberized Concrete

2021 ◽  
Vol 14 (1) ◽  
pp. 137
Author(s):  
Sylvia E. Kelechi ◽  
Musa Adamu ◽  
Abubakar Mohammed ◽  
Ifeyinwa I. Obianyo ◽  
Yasser E. Ibrahim ◽  
...  
Keyword(s):  
Fly Ash ◽  
Co2 Emission ◽  
Calcium Carbide ◽  
Crumb Rubber ◽  
Cementitious Materials ◽  
Strength Properties ◽  
Cementitious Material ◽  
Ternary Blend ◽  
Fine Aggregate ◽  
Concrete Production

Global warming and climate changes are the major environmental challenges globally. With CO2 emission being one of the main greenhouse gases emitted to the environment, and cement and concrete production amounting to about 10% of the global CO2 emission, there is a need for the construction industry to utilize an environmentally sustainable material as an alternative to cement. This study analyzed the cost, CO2 emission and strength properties of green self-compacting concrete (SCC) ternary blend containing fly ash, calcium carbide residue (CCR), and crumb rubber (CR) as a replacement material by volume of cement, cementitious material, and fine aggregate, respectively. Cement was replaced with fly ash at 0 and 40% by volume. CCR was used as a replacement at 5 and 10% by volume of cementitious materials, CR replaced fine aggregate in proportions of 10 and 20% by volume. The result indicated that the mix with 0% fly ash and 20% CR replacement of fine aggregate was the most expensive and had the highest CO2 emission. However, the mix with 10% CR, 40% fly ash, and 10% CCR had the lowest CO2 emission and was therefore the greenest SCC mix. The 28-day maximum compressive strength of 45 MPa was achieved in a mix with 0% CR, 0% fly ash, and 10% CCR, while the utmost 28-day splitting tensile strength of 4.1 MPa was achieved with a mix with 10% CR, 0% fly ash, and 5% CCR, and the highest flexural strength at 28 days was 6.7 MPa and was also obtained in a mix with 0% CR, 0% fly ash, and 5% CCR. In conclusion, a green SCC can be produced by substituting 40% cement with fly ash, 10% fine aggregate with CR, and 10% CCR as a replacement by volume of cementitious material, which is highly affordable and has an acceptable strength as recommended for conventional SCC.

scholarly journals Stabilization of Clayey Soil using Gypsum and Calcium Chloride

2020 ◽  
Vol 9 (2) ◽  
pp. 668-673
Keyword(s):  
Fly Ash ◽  
Calcium Chloride ◽  
Clayey Soil ◽  
Research Paper ◽  
Crumb Rubber ◽  
Strength Properties ◽  
Reinforced Soil ◽  
Natural Soil ◽  
Stabilization Process ◽  
Binding Material

The engineering strength properties of expensive soils (clayey soil) such as compaction characteristics and bearing capacity can be improved by stabilization process of the soil. These properties can be improved by controlled compaction using the mechanical equipment’s or by addition of suitable admixtures like cement, fly ash, lime, gypsum or by reinforcing the soil with shredded tyre, crumb rubber, plastic waste etc. But gypsum is used now a days to enhance the geotechnical properties. So, in this research paper gypsum and calcium chloride has been used to improve the various strength properties of natural soil. The objective of this research paper is to examine the strength properties of natural clayey soil reinforced with different percentage of gypsum by the weight of soil and fixed percentage of calcium chloride(Cacl2) as a binding material. A series of Standard Proctor tests(for calculation of MDD and OMC) and California Bearing Ratio (C.B.R) tests are conducted on both raw clayey soil and reinforced soil with different percentages of gypsum (2%, 4%, 6% and 8%) by weight and with fixed percentage of calcium chloride (0.75%). A comparison between properties of raw clayey soil, raw clayey soil mixed with gypsum and raw clayey soil mixed with gypsum and calcium chloride (CaCl2) are performed. It is found that the properties of clayey soil mixed with gypsum and calcium chloride (CaCl2) are suitably enhanced.

Experimental Analysis of Mechanical Properties on Concrete with Nano Silica Additive

2019 ◽  
Vol 57 ◽  
pp. 93-104 ◽  
Author(s):  
Usha Sivasankaran ◽  
Seetha Raman ◽  
S. Nallusamy
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Fly Ash ◽  
Compression Strength ◽  
Experimental Analysis ◽  
Strength Properties ◽  
Concrete Mixture ◽  
Partial Replacement ◽  
Cement Particle ◽  
Nano Silica

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.

A review on utilization of different concretes as in-filled steel hollow column subjected to fire loading

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Nurizaty Zuhan ◽  
Mariyana Aida Ab Kadir ◽  
Muhammad Najmi Mohamad Ali Mastor ◽  
Shek Poi Ngian ◽  
Abdul Rahman Mohd. Sam
Keyword(s):  
Elevated Temperature ◽  
Fly Ash ◽  
Recycled Aggregate ◽  
Filling Material ◽  
Design Guideline ◽  
Content Type ◽  
Concrete Production ◽  
Steel Column ◽  
Different Types ◽  
Research Gap

Purpose Concrete-filled steel hollow (CFHS) column is an innovation to improve the performance of concrete or steel column. It is believed to have high compressive strength, good plasticity and is excellent for seismic and fire performance as compared to hollow steel column without a filler. Design/methodology/approach Experimental and numerical investigation has been carried out to study the performance of CFHS having different concrete in-fill and shape of steel tube. Findings In this paper, an extensive review of experiment performed on CFHS columns at elevated temperature is presented in different types of concrete as filling material. There are three different types of concrete filling used by the researchers, such as normal concrete (NC), reinforced concrete and pozzolanic-fly ash concrete (FC). A number of studies have conducted experimental investigation on the performance of NC casted using recycled aggregate at elevated temperature. The research gap and the recommendations are also proposed. This review will provide basic information on an innovation on steel column by application of in-filled materials. Research limitations/implications Design guideline is not considered in this paper. Practical implications Fire resistance is an important issue in the structural fire design. This can be a guideline to define the performance of the CFHS with different type of concrete filler at various exposures. Social implications Utilization of waste fly ash reduces usage of conventional cement (ordinary Portland cement) in concrete production and enhances its performance at elevated temperature. The new innovation in CFHS columns with FC can reduce the cost of concrete production and at the same time mitigate the environmental issue caused by waste material by minimizing the disposal area. Originality/value Review on the different types of concrete filler in the CFHS column. The research gap and the recommendations are also proposed.

scholarly journals Determining the optimum percentages of fly ash, metakaolin and copper slag by replacing cement and fine aggregate in m30 grade concrete

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Stephen Isaac
Keyword(s):  
Fly Ash ◽  
Carbon Dioxide Emission ◽  
High Strength ◽  
Copper Slag ◽  
High Energy ◽  
Strength Properties ◽  
Partial Replacement ◽  
Copper Extraction ◽  
Fine Aggregate ◽  
Concrete Production

The overall production of the cement has greatly increased which results lots of problems in environment as it involves the emission of CO2   gas.  Environmental concerns, stemming from the high energy expense and carbon dioxide emission associated with cement manufacture have brought about pressures to reduce cement consumption through the use of supplementary materials. Materials such as Metakaolin, fly ash have good pozzolanic activity and are a good material for the production of high strength concrete. Copper slag is a by-product of copper extraction by smelting. Copper slag can be used in concrete production as a partial replacement for sand. However, it is expected that the use of Metakaolin, Fly ash and Copper slag in concrete improves the strength properties of concrete. Keywords: Supplementary cementitious material, Cement, Fine aggregate

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