Готові списки джерел за темами / Fly-ash Composites

Добірка наукової літератури з теми "Fly-ash Composites"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Fly-ash Composites"

1

Cosnita, Mihaela, Monica Balas, and Cristina Cazan. "The Influence of Fly Ash on the Mechanical Properties of Water Immersed All Waste Composites." Polymers 14, no. 10 (May 11, 2022): 1957. http://dx.doi.org/10.3390/polym14101957.

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Анотація:
The paper presents new value-added composite materials prepared by recycling tire rubber, polyethene terephthalate (PET), high-density polyethene (HDPE), wood sawdust, and fly ash. The composites were manufactured through the compression molding technique for three temperatures (150 °C, 160 °C, and 190 °C) previously optimized. The addition of fly ash as reinforcement in polymer blends is a viable route to improve the composite” properties. The paper aims to assess the effect of fly ash on the mechanical properties and water stability of the new all waste composites considering their applications as outdoor products. The static tensile (stress-strain behavior) and compression properties of the composites were tested. The fly ash composites were characterized in terms of wetting behavior and surface energies (contact angle measurements); chemical structure of the new interface developed between composite” components (FTIR analysis), crystalline structure (XRD analysis), surface morphology and topography (SEM, AFM). The addition of fly ash promoted the development of the hybrid interfaces in the new composites, as FTIR analysis has shown, which, in turn, greatly improved the mechanical and water resistance. The novel all waste composites exhibited lower surface energies, larger contact angles, and smoother morphologies when compared to those with no fly ash. Overall, the study results have revealed that fly ash has improved the mechanical strength and water stability of the composites through the formation of strong hybrid interfaces. The study results show optimal water stability and tensile strength for 0.5% fly ash composites cured at 190 °C and optimal compressive strength with good water stability for 1% fly ash composite cured at 150 °C.
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2

Juang, Shueiwan Henry, and Ching-Feng Li. "Influence of Different Addition Ratios of Fly Ash on Mechanical Properties of ADC10 Aluminum Matrix Composites." Metals 12, no. 4 (April 11, 2022): 653. http://dx.doi.org/10.3390/met12040653.

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Анотація:
Aluminum-fly ash composites are formed by the chemical reaction between fly ash and the high-temperature aluminum-based alloy, which melts to form aluminum oxide as a reinforcing phase, which belongs to a composite of in situ synthetic reinforcing phases. Compared to aluminum-based alloys, composites have superior strength, rigidity, damping capacity, and wear resistance, but lower ductility and toughness. In this study, different fly ash addition ratios (0, 3, 6, 9, 12, and 15 wt%) were added to the ADC10-2Mg alloy melt via stir casting to form the aluminum-fly ash composite under the chemical reaction at 800 °C for 30 h. Subsequently, microstructure observation, density and porosity measurements, and hardness and tensile tests were conducted to analyze the influence of different fly ash weight percentages on the mechanical properties of aluminum-fly ash composites. According to the results, an aluminum-fly ash composite with good dispersibility of fly ash debris can be prepared by stir casting, and the fly ash particles gradually decomposed small debris as they reacted with the aluminum-based alloy at high temperatures during a long-term reaction process. The density of the aluminum–fly ash composite was reduced by adding fly ash, and its hardness and tensile strength were improved as well. However, the porosity increased with the amount of fly ash and the ductility was diminished. For the aluminum-fly ash composite with 6 wt% of fly ash, its density decreased by approximately 2%, the hardness and tensile strength increased by 7% and 49%, respectively, and the ductility decreased by 35%, as compared to those of the ADC10 alloy.
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Pritam Praharaj, Ankita, Dibakar Behera, Tapan Kumar Bastia, Prasanta Rath, and Priyabrata Mohanty. "BisGMA/jute fibre/fly ash hybrid composites." Pigment & Resin Technology 43, no. 5 (August 26, 2014): 263–70. http://dx.doi.org/10.1108/prt-06-2013-0089.

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Анотація:
Purpose – This paper aims to prepare BisGMA (bisphenol-A glycidyldimethacrylate)/jute fibre/fly ash hybrid composites with improved mechanical and corrosive properties. Design/methodology/approach – BisGMA prepolymer was first synthesised using diglycidyl ether of bisphenol-A and methacrylic acid. Then 2-hydroxy ethylacrylate-treated jute fibre and sodium hydroxide-treated fly ash were incorporated in the fabrication of composites using dicumyl peroxide, cobalt naphthenate and N,N-dimethyl aniline as catalyst, accelerator and promoter, respectively. The composition of BisGMA, jute fibre and fly ash was kept constant, whereas treated and untreated jute fibre and fly ash were used alternatively. Findings – Treatment of both jute and fly ash leads to improved mechanical properties of composites. However, treated fabric plays a dominant role compared to treated fly ash as filler. Among all the composites, the one having both treated jute fibre and treated fly ash is the most suitable composite for structural applications. Research limitations/implications – The present investigation has come up with a hybrid composite that can be used for a wide range of applications like low-cost housing and structural projects, structural laminates, etc., as it is both corrosion- and moisture-resistant. It is also the most durable from the mechanical point of view. There is also a scope of using other fillers instead of fly ash to study the changes brought about in the mechanical properties. Originality/value – The above composites have never been fabricated before.
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Orsakova, Denisa, Rudolf Hela, Petr Novosad, and Jaroslav Valek. "Possible Synergism of High Temperature Fly Ash and Fluidized Bed Combustion Fly Ash in Cement Composites." Advanced Materials Research 1106 (June 2015): 29–32. http://dx.doi.org/10.4028/www.scientific.net/amr.1106.29.

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Анотація:
One of the possibilities how to activate fly ash in cement composites is to add calcium oxide as a chemical activator. This addition can improve pH of composites. Because fluidized bed combustion (FBC) fly ash contain around 15% of calcium oxide, we decided to add FBC fly ash into binder system of cement composite with classic fly ash.Three mixtures were designed. First one contain in binder system only cement and classic fly ash. In second and third mixture was part (25% resp. 50%) of classic fly ash replaced by FBC fly ash. Consistency, shrinkage, compressive strength and freeze-thaw resistance were tested. Microstructure was detected by XRD and TG analyses.
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5

Zhang, P., Q. Li, and Z. Sun. "Effect of polypropylene fibre on flexural properties of concrete composites containing fly ash and silica fume." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 226, no. 2 (February 16, 2012): 177–81. http://dx.doi.org/10.1177/1464420712437637.

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Анотація:
The application of fly ash and silica fume in concrete composites by blending synchronously can improve the mechanical properties of concrete composites. However, the concrete composite becomes much brittle with the usage of fly ash and silica fume. Polypropylene fibre is often used to improve the ductility of concrete composites. This article discusses the effect of polypropylene fibre on the flexural properties of concrete composites containing fly ash and silica fume. Results reveal that the addition of polypropylene fibre can increase the flexural strength and decrease the flexural modulus of elasticity of the concrete composite containing fly ash and silica fume evidently. Furthermore, it is indicated that an increase in the fibre volume fraction leads to an increase in the flexural strength and a decrease in the flexural modulus of elasticity when the fibre volume fraction is not beyond 0.12 per cent. Polypropylene fibre seems to play an important role to improve the ductility of concrete composites containing fly ash and silica fume.
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Rao, D. V., Shaik Chand Mabhu Subhani, N. Vijay Kumar, and Ch Naveen Kumar. "To Study the Mechanical Properties of Slag and Fly Ash Reinforced As 2024 Composites." International Journal of Innovative Research in Engineering and Management 9, no. 6 (December 26, 2022): 111–13. http://dx.doi.org/10.55524/ijirem.2022.9.6.19.

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Анотація:
Metal matrix composites (MMCs) possess significantly improved properties compared to unreinforced alloys. There has been an increasing interest in composites containing low density and low cost reinforcements. In view of the generation of large quantities of solid waste by products like fly ash and slags, the present study is discarded, new methods for treating and using these solid wastes are required. Hence, composites with fly ash and Granulated blast furnace slag as reinforcements are likely to overcome the cost barrier for wide spread applications in automotive and small engine applications. In the present investigation, AA 2024 alloy – 5 wt. % fly ash and slag composites separately were made by stir casting route. Phase identification and structural characterization were carried out on fly ash and GBF slag by X-ray diffraction studies.The hardness and compression tests were carried out on all these alloy and composites. The reinforcement Improved hardness and mechanical properties were observed for both the composites compared to alloy; this increase is higher for AA2024-Fly ash composite than AA2024- Granulated blast furnace slag composite.
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7

Azhagarsamy, P., and K. Sekar. "Investigation on Mechanical and Tribological Properties of AA7075 Alloy with B4C, Gr and Fly Ash Reinforced Hybrid Composites." Materials Science Forum 979 (March 2020): 52–57. http://dx.doi.org/10.4028/www.scientific.net/msf.979.52.

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Анотація:
The Aluminum alloys and its composites are used in the aerospace, automobile and marine industries due to their higher strength, stiffness and wear resistance properties. This study is focused on mechanical and tribological study of Al 7075 hybrid composite reinforced with B4C, Gr and Fly ash. The reinforcements are added to Al alloy in three different compositions such as (4wt% B4C/4wt% Gr/7wt% Fly ash, 4wt% B4C/5wt% Gr/8wt% Fly ash and 4wt% B4C/6wt% Gr/9wt% Fly ash). The stir casting machine was used for manufacturing hybrid composites. Hardness and wear tests were conducted for three different Al 7075 hybrid composites. The microstructure showed that the reinforcement was uniformly distributed in the matrix without agglomeration. The hardness and wear test results revealed that the composite with 4wt% B4C /6wt% Gr/9wt% Fly ash exhibited an increase in hardness value of about 22.69% and the minimum wear rate as compared to other composites.
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Mohd Nasir, Nur Hazzarita, Fathoni Usman, Ean Lee Woen, Mohamed Nainar Mohamed Ansari, Abu Bakar Mohd Supian, and Saloma Saloma. "Microstructural and Thermal Behaviour of Composite Material from Recycled Polyethylene Terephthalate and Fly Ash." Recycling 8, no. 1 (January 9, 2023): 11. http://dx.doi.org/10.3390/recycling8010011.

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Анотація:
Nowadays, the environmental impact of plastic waste is crucial, and in the energy industry, fly ash, a type of solid waste, has also prompted severe ecological and safety concerns. In this study, we synthesised composite material from two industrial wastes: recycled polyethylene terephthalate (rPET) as the matrix and fly ash as the filler. The effect of different fly ash loadings on the thermal behaviour and microstructure of the composite material using rPET were evaluated. Various loading amounts of fly ash, up to 68%, were added in the rPET mixtures, and composites were made using a single-threaded bar’s barrel extruder. The feeding zone, compression zone, and metering zone made up the three functional areas of the extruder machine with a single-flighted, stepped compression screw. The composite materials were subjected to DSC and SEM equipped with EDX spectroscopy tests to examine their thermal behaviour and microstructural development. It was found that the thermal behaviour of rPET improved with the addition of fly ash but degraded as the fly ash loading increased to 68%, as confirmed by the DSC study. The composites’ microstructural development revealed an even filler distribution within the polymer matrix. However, when the fly ash loading increased, voids and agglomeration accumulated, affecting the composites’ thermal behaviour.
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9

Razzaq, Alaa Mohammed, Dayang Laila Majid, Uday M. Basheer, and Hakim S. Sultan Aljibori. "Research Summary on the Processing, Mechanical and Tribological Properties of Aluminium Matrix Composites as Effected by Fly Ash Reinforcement." Crystals 11, no. 10 (October 8, 2021): 1212. http://dx.doi.org/10.3390/cryst11101212.

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Анотація:
Fly ash is the main waste as a result of combustion in coal fired power plants. It represents about 40% of the wastes of coal combustion products (fly ash, boiler ash, flue gas desulphurization gypsum and bottom ash). Currently, coal waste is not fully utilized and waste disposal remains a serious concern despite tremendous global efforts in reducing fossil fuel dependency and shifting to sustainable energy sources. Owing to that, employment of fly ash as reinforcement particles in metallic matrix composites are gaining momentum as part of recycling effort and also as a means to improve the specifications of the materials that are added to it to form composite materials. Many studies have been done on fly ash to study composite materials wear characteristics including the effects of fly ash content, applied load, and sliding velocity. Here, particular attention is given to studies carried out on the influence FA content on physical, mechanical, and the thermal behavior of Aluminium-FA composites. Considerable changes in these properties are seen by fly ash refinement with limited size and weight fraction. The advantage of fly ash addition results in low density of composites materials, improvement of strength, and hardness. It further reduces the thermal expansion coefficient and improve wear resistance.
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Ťažký, Martin, and Rudolf Hela. "Synergistic Effect of High Temperature Fly Ash with Fluidized Bed Combustion Fly Ash in Cement Composites." Key Engineering Materials 722 (December 2016): 113–18. http://dx.doi.org/10.4028/www.scientific.net/kem.722.113.

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Анотація:
Using high temperature fly ash for his pozzolan properties to cement composite production is known a few years ago. New ways combustion of fossil fuels also creates a new type of fly ash, named fluidized bed combustion fly ash. However, this fly ash has same pozzolan properties as has high temperature fly ash, this type is not using for production of cement composites. Fluidized bed combustion fly ash has highly variable chemical composition but usually it has a higher amount of free CaO together with sulphates. This higher amounts of free CaO after mixing of fluidized bed combustion fly ash with water to some extent becomes an activator for the beginning of the pozzolanic reaction, during which is consumed the extinguished CaO. If there is also present high temperature fly ash in cement composite, it could be accelerated his pozzolanic reaction in the same manner using a fluidized bed combustion fly ash. In this experiment was tested a synergy effect in the use of fluidized bed combustion fly ash with high temperature fly ash as an additive. The experiment was carried out on cement pastes that have been studied in particular the progress of hydration processes, pointing to a possible acceleration of pozzolanic reactions of both types of fly ash.
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Більше джерел

Дисертації з теми "Fly-ash Composites"

1

Hung, Hsien-Hsin. "Properties of high volume fly ash concrete." Thesis, University of Sheffield, 1997. http://etheses.whiterose.ac.uk/14441/.

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This thesis presents a detailed investigation on the engineering properties and microstructural characteristics of concrete containing a high volume of fly ash (HVF A). The purpose of the project is to evaluate the concept of using relatively large volumes of fly ash in normal portland cement concrete, and hence enhance the beneficial use of fly ash in value-added products and construction. A total of eight concrete mixtures with and without fly ash was investigated. The proportion of fly ash in all the HVF A concrete mixtures varied from 50 to 80 % by weight of the cementitious materials, with a constant water-to-cementitious ratio of 0.40 for all the mixtures. A high degree of workability was maintained by the use of a superplasticizer. To optimize the pozzolanic activity in the HVF A concrete, silica fume was used in some of the mixes. The total cementitious materials content was kept constant at 350 kg/m3 and 450 kg/m3 respectively. The influence of the different replacement materials and two curing regimes was studied. The study consisted of two parts. The first part is an extensive study of the engineering properties such as strength development, modulus of elasticity, ultrasonic pulse velocity, swelling, and drying shrinkage at various ages up to 18 months. The depth of carbonation of HVF A concrete under different curing regimes was also investigated. A study of the microstructure of HVF A concretes forms the second part of the investigation. Pore structure, air permeability and water absorption of HVF A concretes with different replacement mixtures were studied. A detailed discussion dealing with the change of the morphological phase under different curing regimes is also presented. The results show that HVF A concretes exhibit excellent mechanical properties with good long-term strength development. Compressive strength in the range of 40 to 60 MPa "as achieved for all the HVF A concretes at the age of 90 days. The dynamic modulus of elasticity reached values of the order of 55 GPa at 90 days. Under similar conditions, concretes made with both fly ash and silica fume had engineering properties which were as good as those made with cement replaced by fly ash alone. The use of fly ash to replace both cement and sand has the advantage of mobilizing and combining the benefits and effects of both separate replacements. The HVF A concretes also have low permeability and exhibit good potential characteristics to resist water penetration. Reduction in the volume of large pores was observed with the progress of the pozzolanic reaction. Higher HVF A concrete strength was generally associated with a lower volume of large pores in the concrete. A decrease in the levels of calcium hydroxide was seen with progressive water curing and age in all the HVF A concretes, providing evidence of continued pozzolanic reactivity of the fly ashes. Various empirical relationships and design equations are presented and conclusions are drawn at the end of each part. It is recommended that further research is required to determine the influence on HVF A concretes of extreme curing conditions such as high or low temperature and low moisture availability, and to improve the early strength properties of the HVF A concretes.
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2

Zaeni, Akhmad Materials Science &amp Engineering Faculty of Science UNSW. "Modification of fly ash colour from grey black to near white and incoporation of fly ash in polypropylene polymer." Publisher:University of New South Wales. Materials Science & Engineering, 2009. http://handle.unsw.edu.au/1959.4/43755.

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Анотація:
Particulate filled polymer composites are gaining growing acceptance in the commodity industry because the properties can be adjusted according to the industry's requirements. As particulate filler, fly ash is ready to compete with other particular fillers in polymer composites industries. Although fly ash is a cheap material but the fact that fly ash is grey-black in colour, limits the application of fly ash only to product where colour is not important. As such, a method was needed to be developed to increase the whiteness of fly ash without reducing the advantages of it as a cheap material. In this research, twelve commercially provided fly ash samples from Australian thermal power stations were investigated with respect to composition. Seven of them were thermally modified and further investigated and characterized with respect to colour, size, size distribution, and density. Of these seven fly ashes a particular grade was modified to a whiteness of 93.3 in L*a*b* scale (using barium sulfate as standard), without changing other inherent properties such as particle size and density. By comparison L*a*b* value for Omy carb 20, based on calcium carbonate is 96.9. The whiteness of fly ash was increased using a one stage thermal method ensuring the related cost of production would be not a major hurdle. The next aspect of the thesis involved incorporating as-received and heat treated fly ash samples in isotactic polypropylene up to 80 parts of fly ash per hundred resins (phr), demonstrating that fly ash content in polypropylene composites can be quite high with properly maintained combination of mechanical properties -- in particular up to 200 % improvement in Young's modulus and 63 % gain in notched impact properties, as explained in the thesis. Whilst the Young's modulus properties of the fly ash PP composites match very well with Kerner model, they lie in between the Rule of Mixture series and parallel. The tensile strength properties obtained in this research are at least 25 % higher than those predicted by Nielsen, Landon and Nicolais; whereas the strain to failure values are between 25 - 50 % higher than those predicted by Nielsen, and Smith. Whilst tensile strength of the fly ash filled polypropylene composites were less than the original polypropylene samples, as normally reported in the literature, in this thesis surface modification of fly ash particles by using 10% vinyl triethoxy silane (VTES) coupling agent gave a nominal increase in tensile strength especially at higher fly ash content. The final aspect involved study of oxidation behavior of fly ash filled polypropylene composites. Fillers, including fly ash can shorten the life time of polymers from both chemical as well as physical factors. As-received fly ash contains iron based impurities which may catalyze the anti oxidant in polypropylene, therefore reducing the service life time of the polymer. In this work, thermal treatment studies showed that the iron in fly ash can be changed to a chemically inert material so the effective service life of the polymer will only be influenced by physical factors. Therefore thermal treatment of fly ash not only increases the whiteness but also it reduces the risk of the filler on the life time of the polymer, and hence the composites.
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Fizette, Hobson H. "Development of concrete composites by synergistically using Illinois PCC Bottom Ash and Class F Fly Ash /." Available to subscribers only, 2007. http://proquest.umi.com/pqdweb?did=1328063751&sid=8&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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Kearsley, Elizabeth Paulina. "The effect of high volumes of ungraded fly ash on the properties of foamed concrete." Thesis, University of Leeds, 1999. http://etheses.whiterose.ac.uk/287/.

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Анотація:
Foamed concrete is produced by combining foam and slurry thus entrapping numerous small bubbles of air in the cement paste or mortar. The density of foamed concrete is a function of the volume of foam added to the slurry and the strength decreases with decreasing density. In this study the effect on the properties of foamed concrete, of replacing large volumes of cement with both classified and unclassified fly ash (pfa) was investigated. The casting densities of the materials used in this investigation varied between 1000 and 1500 kg/m3 and 50%, 66.7% and 75% of the cement (by weight) was replaced with pfa. The properties measured included compressive strength, dry density, porosity, permeability, water absorption, drying shrinkage, elastic deformation, creep, and void size distribution. The use of high volumes of unclassified ash did not appear to have any significant detrimental effects on the measured properties of the foamed concrete. Although the rate of gain in strength was reduced by the use of large volumes of ash, up to 67% of the cement can be replaced by ash without any significant reduction in, the long-term strength. The permeability increased with increased air content but the water absorption did not appear to be influenced by the volume of air entrained. The elastic modulus of foamed concrete reduced while the creep increased with reducing density. The drying shrinkage of foamed concrete does not seem to be a function of density and the shrinkage values were similar to those of cement paste with similar water/binder ratios; these values were between two to three times greater than those of conventional concrete. An increase in ash content lead to a slight reduction in the drying shrinkage. A mathematical model was developed relating the compressive strength of the foamed concrete to age, porosity and ash/cement ratio.
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5

Puri, Rajnish. "Development of High performance Concrete Composites Using Class F Fly Ash and PCC Bottom Ash, and a Statistical Model to Predict Compressive Strength of Similar Concrete Composites." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/dissertations/1123.

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Анотація:
AN ABSTRACT OF THE DISSERTATION OF RAJNISH PURI, for the Doctorate of Philosophy Degree in ENGINEERING SCIENCE WITH CONCENTRATION IN CIVIL AND ENVIRONMENTAL ENGINEERING, presented on APRIL 15, 2015 at Southern Illinois University Carbondale TITLE: DEVELOPMENT OF HIGH PERFORMANCE CONCRETE COMPOSITES USING CLASS F FLY ASH AND PCC BOTTOM ASH, AND A STATISTICAL MODEL TO PREDICT COMPRESSIVE STRENGTH OF SIMILAR CONCRETE COMPOSITES ADVISOR: Dr. Sanjeev Kumar It is a common knowledge that the use of concrete is as old as the evolution of human civilization. People have always dreamed beyond the dotted lines and so does the usage of concrete. With the rapid industrialization and globalization, the journey from ordinary concrete to high performance concrete (HPC) has been swift and remarkable. The diversification and utilization of high performance concrete has given the tool in the hands of engineers and architects who can now design and execute buildings of any shape and size deemed impractical a few decades ago. The aim of this research was to develop high performance concrete composites having different percentages of Illinois Class “F” fly ash and bottom ash by replacing the appropriate proportions of Type 1 portland cement and fine aggregate, respectively. The target was to develop high performance concrete composites that have compressive strength of 8,000 psi (55 Mpa) after 28 days of curing in water with a slump of 4±½” (102mm ± 13mm) and air content between 4 and 6 percent. In order to achieve the targeted air content, an air entraining agent DARAVAIR 1400 was used. The water-cement ratio of 0.3 was maintained throughout the research and to achieve the targeted slump, high-range water reducer ADVA 140M was used. The engineering parameters of the high performance concrete composites and an equivalent control mix were evaluated by conducting a detailed laboratory study which included several tests, e.g., slump, fresh air content, compressive strength, splitting-tensile strength, flexural strength, resistance to rapid freezing and thawing, sealed shrinkage and free swelling, and rapid chloride permeability. The results presented show that all high performance concrete composites developed in this study achieved the targeted compressive strength of 8,000 psi (55 MPa) after 28 days of curing in water. The results of the durability tests show that the concrete composites developed in this study have trends similar to that of an equivalent conventional concrete. Based, on the results of this study, it was concluded that the concrete composites have potential to be used on real world projects and thus help the environment by substantially reducing the amount of fly ash and bottom ash going to ash ponds or landfills. Based on the experimental test result data, a detailed statistical analysis was conducted to develop an empirical model to predict compressive strength of similar concrete composites for a given amount of fly ash, bottom ash, and curing period. Additional laboratory tests were performed to validate the mathematical model.
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6

Pretorius, Jan Hendrik Christoffel. "The influence of PFA particle size on the workability of cementitious pastes." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-07082005-135427/.

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7

Song, Gao. "Matrix manipulation to study ECC behaviour." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/4647.

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Анотація:
Thesis (MScEng (Civil Engineering))--University of Stellenbosch, 2005.
192 leaves on CD format, preliminary i-xii pages and numbered pages 1-135. Includes bibliography, list of figures and tables.
ENGLISH ABSTRACT: As a fibre reinforced material, engineered cementitious composite (ECC) has tough, strain-hardening behaviour in tension despite containing low volumes of fibres. This property can be brought about by developments in fibre, matrix and interfacial properties. Poly Vinyl Alcohol (PVA) fibre has been developed in recent years for ECC, due to its high tensile strength and elasticity modulus. However, the strong interfacial bond between fibre surface and matrix is a challenge for its application. This study focuses on the tailoring of matrix and fibre/matrix interfacial properties by cement replacement with fly ash (FA) and Ground Granulated Corex Slagment (GGCS). In this study the direct tensile test, three point bending test, micro-scale analysis, such as X-Ray Fluorescence Spectrometry analysis (XRF), Scanning Electron Microscope (SEM), are employed to investigate the influence of cement replacement, aging, Water/Binder (W/B) ratio, workability on ECC behaviour. This study has successfully achieved the aim that cement replacement by FA and GGCS helps to improve the fibre/matrix interfacial properties and therefore enhances the ECC tensile behaviour. Specifically, a high volume FA-ECC has stable high tensile strain capacity at the age of 21 days. This enables a constant matrix design for the investigation of other matrix influences. The Slag-ECC has a higher tensile strength but lower tensile strain capacity. The combination of FA and GGCS, moderate tensile strength and strain capacity is achieved Both tensile tests and Micro-scale analyses infer that the high volume FA-ECC has an adhesive type fibre/matrix interfacial interaction, as opposed to the cohesive type of normal PVA fibre-ECC. The different tensile behaviour trend of steel fibre-ECC and PVA fibre-ECC with the FA content is presented and discussed in this research. The investigations of aging influence indicate that the high volume FA-ECC has a beneficial effect on the properties of the composite at an early stage. However, at a high age, it has some difficulty to undergo multiple cracking and then leads to the reduction of tensile strain capacity. The modified mix design is made with the combination of FA and GGCS, which successfully increases the interfacial bond and, thereby, improves the shear transfer to reach the matrix crack strength. Therefore, an improved high age tensile behaviour is achieved. The W/B and fresh state workability influence investigations show that the W/B can hardly affect the tensile strain at early age. However, the workability influences on composite tensile strain significantly, because of the influence on fibre dispersion. Other investigations with regard to the hybrid fibre influences, the comparison of bending behaviours between extruded plate and cast plate, the relation between bending MOR and tensile stress, and the relation between compression strength and tensile strength contribute to understand ECC behaviour.
AFRIKAANSE OPSOMMING: As ‘n veselversterkte materiaal, het ontwerpte sementbasis saamgestelde materiale, taai vervormingsverhardingseienskappe in trek, ten spyte van lae veselinhoud. Hierdie eienskap word bewerkstellig, deur ontwikkelings in vesel, matriks en tussenveselbindingseienskappe. Poli-Viniel Alkohol (PVA) vesels is ontwikkel vir ECC, as gevolg van die hoë trekkrag en hoë modulus van hierdie veseltipe. Die sterk binding tussen die PVA-veseloppervlak en die matriks is egter ‘n uitdaging vir sy toepassing. Hierdie studie fokus op die skep van gunstige matriks en vesel/matriks tussenvesel-bindingseienskappe deur sement te vervang met vlieg-as (FA) en slagment (GGCS).In hierdie navorsing is direkte trek-toetse, drie-punt-buigtoetse, mikro-skaal analise (soos die X-straal ‘Fluorescence Spectrometry’ analise (XRF) en Skanderende Elektron Mikroskoop (SEM))toegepas. Hierdie metodes is gebruik om die invloed van sementvervanging,veroudering, water/binder (W/B)-verhouding en werkbaarheid op die meganiese gedrag van ECC te ondersoek.Die resultate van hierdie navorsing toon dat sementvervanging deur FA en GGCS help om die vesel/matriks tussenveselbindingseienskappe te verbeter. Dus is die ECC-trekgedrag ook verbeter. Veral ‘n hoë volume FA-ECC het stabiele hoë trekvervormingskapasiteit op ‘n ouderdom van 21 dae. Dit bewerkstellig ‘n konstante matriksontwerp vir die navorsing van ander matriks invloede. Die Slag-ECC het ‘n hoër treksterkte, maar laer trekvervormingskapasiteit. Deur die kombinasie van FA en GGCS word hoë treksterkte, sowel as gematigde vervormbaarheid in trek verkry. Beide trektoetse en mikro-skaal analise dui aan dat die hoë volume FA-ECC ‘n adhesie-tipe vesel/matriks tussenvesel-bindingsinteraksie het, teenoor die ‘kohesie-tipe van normale PVA vesel-ECC. Die verskille in trekgedrag van staalvesel-ECC en PVA vesel-ECC ten opsigte van die FA-inhoud is ondersoek en word bespreek in die navorsing. Die navorsing toon verder dat die hoë volume FA-ECC goeie meganiese eienskappe het op ‘n vroeë ouderdom. Op hoër ouderdom word minder krake gevorm, wat ‘n verlaging in die trekvervormingskapasiteit tot gevolg het. Met die kombinasie van FA en GGCS, word die vesel-matriksverband verhoog, waardeur ‘n verbetering in die skuifoordrag tussen vesel en matriks plaasvind. Verbeterde hoë omeganiese gedrag word daardeur tot stand gebring. Navorsing ten opsigte van die invoed van die W/B en werkbaarheid dui daarop dat die W/B slegs geringe invloed het op die trekvormbaarheid, terwyl die werkbaarheid ‘n dominerende rol speel in hierdie verband.Verdere studies sluit in die invloed van verskillende vesels, die vergelyking van die buigingsgedrag van geëkstueerde plate en gegote plate, die verhouding tussen buigsterkte en treksterkte, en die verhouding tussen druksterkte en treksterkte dra by tot beter begrip van die gedrag van ECC.
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BONDARENKO, VLADIMIR. "The Synthesis and Study of TiO2/Aluminosilicate Composites as Components of Building Finishing Materials for Improvement of the Indoor Air Quality." Doctoral thesis, Università Politecnica delle Marche, 2017. http://hdl.handle.net/11566/251220.

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Lo studio oggetto della tesi presenta il metodo di preparazione di materiali compositi per deposizione chimica di TiO2 su matrici di alluminosilicati per deposizione da una soluzione di Titanio solfato. Materie prime relativamente economiche e facilmente disponibili sono state usate per la preparazione: i frammenti del processo di trattamento meccanico dell'alluminio per l'ottenimento della soluzione di titanio solfato, argille e cenere volante come matrice. L'analisi dei riferimenti di letteratura consente di assumere che questo metodo produca materiali compositi con una larga superficie specifica grazie all'attivazione termoacida e ad una elevata attività fotocatalitica spendibile in applicazioni indoor. Queste proprietà sono confermate dai dati sperimentali ottenuti sui campioni di materiale composito ottenuti, sui quali sono stati valutati: la composizione chimica, la morfologia superficiale con SEM, la dimensione media delle particelle in microscopia ottica, la proprietà di adsorbimento del vapore d'acqua, la capacità di adsorbimento del benzene, la struttura dei pori, l'analisi ai raggi X, l'attività fotocatalitica con metodo di rimozione del MEK con due diversi tipi di box di prova e sorgenti di luce. La stabilità nel tempo delle proprietà dei compositi sviluppati è stata valutata dopo tre anni dalla loro preparazione. Sulla base dei risultati ottenuti sono state discusse le indicazioni per l'ottenimento di Compositi stabili. La relativa semplicità della tecnologia utilizzata ha consentito di descrivere l'organizzazione della produzione industriale del materiale composito e un metodo di possibile promozione industriale. Sono stati esaminati anche compositi contenenti dopanti non metallici come metodo per fornire attività fotocatalitica nel campo della luce visibile. L'uso di cenere volante come matrice del composito è stato studiato come metodo di valorizzazione di un rifiuto industriale. Infine i materiali da costruzione preparati con i compositi a base di TiO2 sono stati testati con il metodo della rimozione del MEK.
This study offers the method for the synthesis of composite material by chemical deposition of TiO2 on aluminosilicate matrix from titanium sulfate solution (precursor). Relatively cheap and available raw materials were used during the preparation: the waste of mechanical processing of titanium (titanium shavings) for obtaining the precursor, montmorillonite, kaolinite, and fly ash as supports. The analysis of the literature sources allows assuming that such method produces the composite with a large specific surface area because of thermoacid activation and high photoactivity suitable for indoor conditions. These properties are confirmed by the experimental data for the obtained samples: Chemical contents; Morphology of surface and average particles size by SEM/optical microscopy; Adsorptive properties and parameters of porous structure, water vapor and benzene vapor adsorption capacity; X-rays analysis of phases; Photoactivity of the materials was estimated by the method of MEK removal in reactors of two different types (16 L & 0,45 L) with two types of UV-irradiation source (ULTRAVITALUX E27 lamp and DFL-5013UVC-380). The stability of the properties of the obtained composites after 3 years of storage was examine. Based on the results obtained, the recommendations for obtaining stable composites were discussed. The relative simplicity of technology allows organizing industrial production of the materials and possible upgrades of the method. Non-metal co-doping of the composites was examined as a method for providing visible light activity of the materials. The use of fly ash as matrix for composites was studied as possible way of valorization of industrial by-product. The building materials prepared with the obtained TiO2–containing component were tested by the method of methyl ethyl ketone removal.
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Eckl, Ondřej. "Využití některých velkoobjemově produkovaných druhotných surovin k přípravě pojiv a kompozitů na bázi geopolymerů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2009. http://www.nusl.cz/ntk/nusl-216460.

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10

Baránek, Šimon. "Elektricky vodivé kompozity na bázi druhotných surovin." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2021. http://www.nusl.cz/ntk/nusl-433564.

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Electroconductive composites are modern materials that are commonly used in many industries such as the construction industry among others. For example these materials can be useful as sensors for monitoring changes in constructions. The aim of this thesis is the research of electrically conductive silicate composite based on secondary raw materials. The design of this composite is based on the development of its own mixtures and experimental verification of the effect of the structure. The introduction part consists of a detailed analysis of 15 materials. Samples of the 5 fine and 2 coarse electrically conductive fillers were tested. Composite with filler Condufit C4 was selected as representative for type of fine fillers. Composite with filler Supragraphite C300 was selected as representative for type of coarse fillers. The selection of the composites was based on the impedance of the fabricated composites with these fillers. Subsequently, the individual components of the primary mixture were substituted. The cement was replaced by high-temperature fly ash in the amount of 20, 30, and 40 %, the aggregate of a similar fraction was replaced by steel sawdust, and the primary electrically conductive fillers were replaced by secondary ones in the amount of 30 and 50 %. All proposed replacements reduced the impedance of the composite. The most effective replacement for impedance reduction was replacement with waste graphite (up to 92 % reduction), which also slightly improved the mechanical properties of the composite. The result of this thesis is an optimized electrically conductive composite based on secondary raw materials with a fine type of filler with 30 % replacement by waste graphite "odpad vysavač"which achieves an impedance of 5 ohms. The partial goal of this thesis is a verification of the influence of moisture on the impedance of composites. Results are significantly affected by moisture when using the coarse type of filler, when using the fine type are not.
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Книги з теми "Fly-ash Composites"

1

Ghosh, Kushal, and Partha Ghosh. Alkali Activated Fly Ash: Blast Furnace Slag Composites. Taylor & Francis Group, 2020.

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Alkali Activated Fly Ash: Blast Furnace Slag Composites. Taylor & Francis Group, 2020.

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Ghosh, Kushal, and Partha Ghosh. Alkali Activated Fly Ash: Blast Furnace Slag Composites. Taylor & Francis Group, 2020.

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Ghosh, Kushal, and Partha Ghosh. Alkali Activated Fly Ash: Blast Furnace Slag Composites. Taylor & Francis Group, 2020.

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5

Dvorkin, Leonid, Vadim Zhitkovsky, Mohammed Sonebi, Vitality Marchuk, and Yuri Stepasiuk. Improving Concrete and Mortar Using Modified Ash and Slag Cements. Taylor & Francis Group, 2020.

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Dvorkin, Leonid, Vadim Zhitkovsky, Mohammed Sonebi, Vitality Marchuk, and Yuri Stepasiuk. Improving Concrete and Mortar Using Modified Ash and Slag Cements. Taylor & Francis Group, 2020.

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Dvorkin, Leonid, Vadim Zhitkovsky, Mohammed Sonebi, Vitality Marchuk, and Yuri Stepasiuk. Improving Concrete and Mortar Using Modified Ash and Slag Cements. Taylor & Francis Group, 2020.

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8

Kamaleddine, Fouad Fayez. developing an alternate backing system made of fly ash composite for nickel shell moulds. 2001.

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9

Impact of Ball Milled Fly Ash Nano Particles on the Strength and Microstructural Characteristics of Cement Composite Mortars. Karur, India: ASDF International, 2017.

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Частини книг з теми "Fly-ash Composites"

1

Sobczak, J., N. Sobczak, and P. K. Rohatgi. "Using Fly Ash for the Production of Light Weight Composites." In Advanced Light Alloys and Composites, 109–15. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-015-9068-6_16.

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2

Dvorkin, Leonid, Vadim Zhitkovsky, Nataliya Lushnikova, and Yuri Ribakov. "Metakaolin as Mineral Admixture for Cement-based Composites." In Metakaolin and Fly Ash as Mineral Admixtures for Concrete, 53–164. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003096825-4.

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3

Venkateshwaran, N., V. Santhanam, and A. Alavudeen. "Feasibility Study of Fly Ash as Filler in Banana Fiber-Reinforced Hybrid Composites." In Processing of Green Composites, 31–47. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6019-0_3.

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4

Ibraheem, Shahad, Sheila Devasahayam, Owen Standard, and Sri Bandyopadhyay. "Fabrication and Surface Characterization of Spherical Fly Ash Particle-Reinforced Epoxy Resin." In Spherical and Fibrous Filler Composites, 39–66. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527670222.ch2.

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5

Afroz, Mahzabin, Indubhushan Patnaikuni, and Srikanth Venkatesan. "Performance Analysis of Hybrid Fiber Reinforced High Volume Fly Ash Cement Composite." In Strain-Hardening Cement-Based Composites, 203–10. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1194-2_24.

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6

Pan, Huang Hsing, Chang-Keng Chiang, Rui-Hao Yang, and Neng-Huei Lee. "Piezoelectric Properties of Cement-Based Piezoelectric Composites Containing Fly Ash." In Lecture Notes in Electrical Engineering, 617–26. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04573-3_77.

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7

Perera, Dan S., Eric R. Vance, David J. Cassidy, Mark G. Blackford, John V. Hanna, and Rachael L. Trautman. "The Effect of Heat on Geopolymers Made Using Fly ASH and Metakaolinite." In Advances in Ceramic Matrix Composites X, 87–94. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118408353.ch8.

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8

Amirkhizi, Alireza V., Jing Qiao, Wiroj Nantasetphong, Kristin Schaaf, and Sia Nemat-Nasser. "Experimental Investigation of Dynamic Mechanical Properties of Polyurea-Fly Ash Composites." In Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials, Volume 3, 149–50. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0213-8_22.

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9

Patel, Sushant, G. L. Devnani, and Deepesh Singh. "Effects of Additives and Treatment on Fly Ash-Based Polymer Composites." In Lecture Notes in Mechanical Engineering, 147–53. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8341-1_12.

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10

Bhandakkar, Ajit, B. Balaji, R. C. Prasad, and Shankar Sastry. "Corrosion and Wear Behaviour of Aluminum Alloy 6061-Fly Ash Composites." In Supplemental Proceedings, 873–81. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062142.ch106.

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Тези доповідей конференцій з теми "Fly-ash Composites"

1

Šulc, Rostislav, Michal Himmel, and Jiří Němeček. "Chloride resistance of concrete with fly ash." In SPECIAL CONCRETE AND COMPOSITES 2019: 16th International Conference. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0000385.

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2

Qiao, Jing, Alireza V. Amirkhizi, Sia Nemat-Nasser, and Gaohui Wu. "Ultrasonic studies of fly ash/polyurea composites." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Nakhiah C. Goulbourne and Hani E. Naguib. SPIE, 2013. http://dx.doi.org/10.1117/12.2012020.

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3

Meruňka, Milan, Lucia Ťažká, and Rudolf Hela. "Determination of the evolution of hydration temperature when combining high-temperature fly ash and fluidized bed combustion fly ash." In SPECIAL CONCRETE AND COMPOSITES 2020: 17th International Conference. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0041965.

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4

Wilińska, Iwona, Barbara Pacewska, and Wojciech Kubissa. "Investigation of Portland cement composites containing high amounts of different kinds of fly ashes." In The 13th international scientific conference “Modern Building Materials, Structures and Techniques”. Vilnius Gediminas Technical University, 2019. http://dx.doi.org/10.3846/mbmst.2019.113.

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Utilization of fluidized fly ash in cement composite is problematic, e.g. because of its changeable chemical composition and increased water demand of the mixture. However, this kind of by-product shows some self-cementing properties, which may be beneficial for low-cement mixtures. The article compares the impact of various kinds of fly ashes, i.e. fluidized fly ash and conventional one, and their mixtures on hydration of fly ash–cement compositions in relation to properties of final material. The amount of fly ash in the binder was 50 wt%. Calorimetry, thermal analysis (TG/DTG) and infrared spectroscopy were used. Compressive strength and water absorption of hardened composites were also registered. It was found that both fly ashes exhibit delay effect in fly ash-cement pastes which causes extension of initial setting time and lower heat released compared to the reference without fly ash. At later hydration days, fluidized fly ash develops higher pozzolanic activity than conventional one. Compositions with fluidized fly ash show better compressive strength compared to those containing conventional one. Mixing of different materials of high and low activity (fluidized and conventional fly ash in this case) seems to be a good way for creation of new cement replacement material.
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5

Chi, Maochieh, Jiang-Jhy Chang, and Kuo-Lien Chen. "Strength properties of cement-based composites with CFBC fly ash and coal-fired fly ash." In 2016 International Conference on Civil, Transportation and Environment. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/iccte-16.2016.23.

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6

Formáček, Petr, Rostislav Šulc, and Martina Šídlová. "Behavior of a binder based on sulphocalcic fly ash." In SPECIAL CONCRETE AND COMPOSITES 2020: 17th International Conference. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0042385.

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7

Vachal, Tomas, Rostislav Sulc, and Miroslav Sofron. "Modification of selected fly ash for use in concrete." In SPECIAL CONCRETE AND COMPOSITES 2020: 17th International Conference. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0042038.

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8

RAHMAN, AKM SAMSUR, CHRIAG SHAH, and NIKHIL GUPTA. "Structural Evaluation of Fly Ash Based Geopolymer Composites for High Temperature Applications." In American Society for Composites 2020. Lancaster, PA: DEStech Publications, Inc., 2020. http://dx.doi.org/10.12783/asc35/34938.

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9

Formáček, Petr, Rostislav Šulc, Denisa Vondráčková, Martina Šídlová, and Adéla Polonská. "Chemical resistance of the binder based on sulfocalcic fly ash." In SPECIAL CONCRETE AND COMPOSITES 2019: 16th International Conference. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0000474.

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10

Durgadevi, S. "Experimental Investigation on Effects of Bendable Composites on Ductility." In Sustainable Materials and Smart Practices. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901953-41.

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Abstract. The challenge in the structural characterization on ductile behaviour of bendable composite is to enhance the structural safety under severe loading. This paper emphasis on inclusion of a high dosage of fly ash (class F) with fly ash to cement (FA/C) in the ratio of 1.6 and an optimum amount of 2% of Polyvinyl Alcohol (PVA) fibres on the ductile behaviour of reinforced and unreinforced Bendable Composite. The absence of Coarse aggregates in this Bendable Composite reduces the crack width which increases the tensile strain capacity of Bendable Composites. The ductile behaviour of this Bendable Composite gives a high-end property in earthquake resistance applications when compared to conventional concrete.
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Звіти організацій з теми "Fly-ash Composites"

1

P, Shanmughasundaram, and R. Subramanian. Aluminium - Fly Ash Composites as Light Weight Materials for Automotive Industry. Warrendale, PA: SAE International, October 2011. http://dx.doi.org/10.4271/2011-28-0009.

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2

Golden, Dean, and Pradeep Rohatgi. Fly ash-enhanced aluminum composites for automotive parts. Report for program startup to September 30, 1997. Office of Scientific and Technical Information (OSTI), October 1997. http://dx.doi.org/10.2172/761812.

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3

Golden, Dean, and Pradeep Rohatgi. Fly ash-enhanced aluminum composites for automotive parts. [Reports for October to December, 1997, and January to March, 1998]. Office of Scientific and Technical Information (OSTI), April 1998. http://dx.doi.org/10.2172/761813.

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4

Golden, Dean, and Pradeep Rohatgi. Fly ash-enhanced aluminum composites for automotive parts. [Reports for April to June, 1998, and July to September, 1998]. Office of Scientific and Technical Information (OSTI), October 1998. http://dx.doi.org/10.2172/761814.

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5

Weiss, David, Robert Purgert, Richard Rhudy, and P. Rohatgi. Aluminum-fly ash metal matrix composites for automotive parts. [Reports for October 1 to December 1998, and January 31 to March 31, 1999]. Office of Scientific and Technical Information (OSTI), April 1999. http://dx.doi.org/10.2172/761815.

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6

Weiss, David, Robert Purgert, Richard Rhudy, and P. Rohatgi. Aluminum-fly ash metal matrix composites for automotive parts. [Reports for April 1 to June 30, 1999, and July 1 to September 30, 1999]. Office of Scientific and Technical Information (OSTI), October 1999. http://dx.doi.org/10.2172/761817.

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7

Weiss, David, Robert Purgert, Richard Rhudy, and Pradeep Rohatgi. Aluminum-fly ash metal matrix composites for automotive parts. [Reports for October 1 to December 31, 1999, and January 1 - to March 31, 2000]. Office of Scientific and Technical Information (OSTI), April 2000. http://dx.doi.org/10.2172/761818.

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Також вас можуть зацікавити розширені добірки на тему "Fly-ash Composites" для конкретних типів джерел:
Статті в журналах Дисертації
Ми пропонуємо знижки на всі преміум-плани для авторів, чиї праці увійшли до тематичних добірок літератури. Зв'яжіться з нами, щоб отримати унікальний промокод!

До бібліографії