scholarly journals Effect of Fly Ash on the Properties of Ceramics Prepared from Steel Slag

2018 ◽  
Vol 8 (7) ◽  
pp. 1187 ◽  
Author(s):  
Yanbing Zong ◽  
Xuedong Zhang ◽  
Emile Mukiza ◽  
Xiaoxiong Xu ◽  
Fei Li
Keyword(s):  
Fly Ash ◽  
Flexural Strength ◽  
Water Absorption ◽  
Sintering Temperature ◽  
Steel Slag ◽  
Diffraction Peak ◽  
National Standard ◽  
Sintered Ceramic ◽  
Base Steel ◽  
Sintering Shrinkage

In this study, SiO2–Al2O3–CaO–MgO steel slag ceramics containing 5 wt % MgO were used for the preparation of ceramic bodies, with the replacement of 5–20 wt % quartz and feldspar by fly ash. The effect of the addition of fly ash on the sintering shrinkage, water absorption, sintering range, and flexural strength of the steel slag ceramic was studied. Furthermore, the crystalline phase transitions and microstructures of the sintered samples were investigated by XRD, Fourier transform infrared (FTIR), and SEM. The results showed that the addition of fly ash affected the crystalline phases of the sintered ceramic samples. The main crystal phases of the base steel slag ceramic sample without fly ash were quartz, diopside, and augite. With increasing fly ash content, the quartz diffraction peak decreased gradually, while the diffraction peak intensity of anorthite became stronger. The mechanical properties of the samples decreased with the increasing amount of fly ash. The addition of fly ash (0–20 wt %) affected the optimum sintering temperature (1130–1160 °C) and widened the sintering range. The maximum addition amount of fly ash should be 15 wt %, for which the optimum sintering temperature was 1145 °C, water absorption was 0.03%, and flexural strength was 43.37 MPa higher than the Chinese national standard GBT 4100-2015 requirements.

Preparation and Characterization of β-SiAlON Ceramics from High Aluminium Fly Ash via Carbothermal Reduction-Nitridation

2007 ◽  
Vol 561-565 ◽  
pp. 587-590 ◽  
Author(s):  
Jin Hong Li ◽  
Hong Wen Ma ◽  
Ying Cao
Keyword(s):  
Fly Ash ◽  
Flexural Strength ◽  
Physicochemical Properties ◽  
Water Absorption ◽  
Bulk Density ◽  
Carbothermal Reduction ◽  
Sintering Temperature ◽  
Sem Images ◽  
High Aluminium

In this work, β-sialon ceramics were prepared from high-aluminium fly ash via carbothermal reduction-nitridation (CRN) and the physicochemical properties of the materials such as bulk density, apparent porosity, water absorption and flexural strength were also discussed. The results showed that the percentage of β-sialon phase in the product decreases as the temperature increases from 1400°C and the weight of the sintered specimen experienced an increase during 1350°C~1450°C due to the nitridation reactions, and followed by a gradual decrease till 1550°C for the decomposition of β-sialon. It is indicated that the optimum sintering temperature to obtain the highest yield of β-sialon ~93% lies in 1400°C~1450°C. The SEM images revealed that the prepared β-sialon sintered at 1400°C were mainly in shape of elongated prisms, typically ~5μm in length and 0.5~1μm in width. As the temperature increased to 1500°C and above, β-sialon decomposed and the new phases of SiC and AlN were formed at 1550°C as confirmed by XRD.

Fabrication of Permeable Material with Sugar Mud and City Sludge

2012 ◽  
Vol 174-177 ◽  
pp. 739-742
Author(s):  
Yang Yang Jing ◽  
Wen Yuan Gao ◽  
Hong Tao Jiao ◽  
Jian Bo Liu
Keyword(s):  
Fly Ash ◽  
Flexural Strength ◽  
Water Absorption ◽  
Glass Powder ◽  
Sintering Temperature ◽  
Holding Time ◽  
Crystal Phase ◽  
Material Research ◽  
Aperture Size ◽  
Permeable Material

Analysis and research the composition and properties of sugar mud and city sludge and add other materials to make the permeable material. Research results show that the main crystal phase with Mullite, Quartz and Calciclase when the mass percent respectively of sugar mud, fly ash, clay, waste ceramic, city sludge, glass powder are 15%, 20%, 35%, 20%, 5%, 5%, the optimal sintering temperature is 1100°C and the holding time is 0.5h. The water absorption of permeable material is 24.50%, the porosity is 34.81%, the flexural strength is 14.33MPa, the range of aperture size is 5μm ~30μm.

scholarly journals Preparation of Steel Slag Ceramics with Different MgO/Al2O3 Ratios

2019 ◽  
Vol 9 (22) ◽  
pp. 4741
Author(s):  
Xuedong Zhang ◽  
Chaozhen Zheng ◽  
Sanping Liu ◽  
Yanbing Zong ◽  
Qifan Zhou ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Water Absorption ◽  
Crystalline Phase ◽  
Steel Slag ◽  
Linear Shrinkage ◽  
National Standard ◽  
Al2o3 Content ◽  
X Ray Diffraction ◽  
X Ray ◽  
Factsage Software

Steel slag, clay, quartz, feldspar, and talc were mixed to prepare steel slag ceramics. Crystalline phase transitions, microstructures, and the main physical-mechanical properties (water absorption, linear shrinkage, and flexural strength) of steel slag ceramics for various MgO/Al2O3 ratios were investigated by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and mechanical testing. The results indicated the significant effect of the MgO/Al2O3 ratio on these properties. A decrease in the MgO/Al2O3 ratio resulted in a major crystalline phase transformation from quartz and pyroxene phases to quartz and anorthite phases. High MgO content facilitated production of pyroxene phases. High Al2O3 content favored production of anorthite phases. The water absorption of all the samples (below 0.5%) met the Chinese national standard requirements. Samples with an MgO/Al2O3 ratio of 0.6 exhibited excellent flexural strength, reaching 62.20 MPa. FactSage software was used to predict batch viscosity, which increased with decreasing MgO/Al2O3 ratios.

Investigation of the Sintering Mechanism of Steel Slag-Based Ceramics

2014 ◽  
Vol 584-586 ◽  
pp. 1202-1207
Author(s):  
Yuan Yuan Zhou ◽  
Yu Li ◽  
Da Qiang Cang ◽  
Hong Li
Keyword(s):  
Flexural Strength ◽  
Water Absorption ◽  
Sintering Temperature ◽  
Steel Slag ◽  
Value Added ◽  
X Ray Diffraction ◽  
X Ray ◽  
A Value ◽  
Dominant Phase ◽  
Scanning Electron

In order to manufacture high-value added materials from steel slag, a steel slag-based ceramic was prepared in the paper. X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques were carried out to characterize the phase formation and the microstructure of the steel slag-based ceramics. Besides, the line shrinkage, flexural strength and water absorption were also determined.Results show that the variation of the line shrinkage and the flexural strength had a positive correlation with the increase of the temperature at the interval 1160°C~1210°C, which was opposite to the change of the water absorption. 1210°C was proved to be the optimum sintering temperature in this work, at which the maximum flexural strength was obtained with a value of 99.39MPa. With the temperature increasing, the quartz phase gradually decreased, participating in the sintering reaction, and the diopside become dominant phase with columnar crystals in 2-5μm at length, which would contribute to the fine performance of the ceramics.

Effect of Fly Ash/Alkaline Activator Ratio and Sodium Silicate/NaOH Ratio on Fly Ash Geopolymer Coating Strength

2013 ◽  
Vol 594-595 ◽  
pp. 146-150 ◽  
Author(s):  
J. Liyana ◽  
Abdullah Mohd Mustafa Al Bakri ◽  
Kamarudin Hussin ◽  
C.M. Ruzaidi ◽  
A. Rashid Azura
Keyword(s):  
Fly Ash ◽  
Flexural Strength ◽  
Sodium Silicate ◽  
Sintering Temperature ◽  
Coating Material ◽  
Liquid Ratio ◽  
Alkali Activator ◽  
Alkaline Activator ◽  
Solid Liquid ◽  
Exposure Conditions

Fly ash geopolymer coating material potential used to protect surface used in exposure conditions. Ratio of fly ash/alkaline activator and Na2SiO3/NaOH play important parameter on determining the best flexural strength of geopolymer coating material. Fly ash and alkali activator (Al2O3/Na2SiO3) were mixed with the solids-to-liquid ratios in range of 1.0-3.0 and different ratios of Na2SiO3/NaOH (1.0-3.0) to prepare geopolymer coating material at constant NaOH concentration of 10 M. Effect of fly ash/alkaline activator ratio and Na2SiO3/NaOH on geopolymer coating was determined with respect to the highest flexural strength of the 1200oC sintering temperature of geopolymer coating substrates. The results concluded that the highest strength for fly ash geopolymer coating material is achieved 42 MPa when the solid/liquid ratio is 2.0 and the Na2SiO3/NaOH ratio is 2.5.

scholarly journals Effect of fly ash on physical and mechanical properties of mortar

2019 ◽  
Vol 17 (6) ◽  
pp. 35
Author(s):  
Vu-An Tran
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Flexural Strength ◽  
Water Absorption ◽  
Thermal Power ◽  
Setting Time ◽  
Physical And Mechanical Properties ◽  
Flow Density ◽  
Control Specimen

This research investigates the physical and mechanical properties of mortar incorporating fly ash (FA), which is by-product of Duyen Hai thermal power plant. Six mixtures of mortar are produced with FA at level of 0%, 10%, 20%, 30%, 40%, and 50% (by volume) as cement replacement and at water-to-binder (W/B) of 0.5. The flow, density, compressive strength, flexural strength, and water absorption tests are made under relevant standard in this study. The results have shown that the higher FA content increases the flow of mortar but significantly decreases the density of mixtures. The water absorption and setting time increases as the samples incorporating FA. Compressive strength of specimen with 10% FA is approximately equal to control specimen at the 91-day age. The flexural strength of specimen ranges from 7.97 MPa to 8.94 MPa at the 91-day age with the best result for samples containing 10% and 20% FA.

Influence of MgO on Properties and Microstructure of Mullite Ceramics Synthesized from Coal Fly Ash

2011 ◽  
Vol 295-297 ◽  
pp. 969-973 ◽  
Author(s):  
Jin Hong Li ◽  
Ling Xin Tong ◽  
Lei Hou ◽  
Jie Shen
Keyword(s):  
Fly Ash ◽  
Aspect Ratio ◽  
Flexural Strength ◽  
Bulk Density ◽  
Sintering Temperature ◽  
Coal Fly Ash ◽  
Strength Increase ◽  
Sintering Process ◽  
High Aluminium ◽  
Mullite Ceramics

The effects of MgO and temperature on the properties and microstructure of mullite ceramics synthesized from high-aluminium coal fly ash and bauxite are investigated in this paper. The results show that when the batch containing 4 wt% MgO is heated from 1100 °C to 1500 °C, the bulk density and flexural strength increase obviously with the sintering temperature rising, mullite ceramics with flexural strength as high as 169 MPa can be obtained at 1500 °C with the addition of 2 wt% MgO. According to the XRD results, the corundum, cordierite and cristobalite phases disappear completely upon 1400 °C, it indicates that MgO addition may effectively promote sintering process. The results of SEM indicate that the prepared ceramics mainly exist in the shape of long parallelepipeds with the aspect ratio of about 7-10.

Evaluation of Coating Properties Produced with Polyester Resins and Industrially Processed Components

2015 ◽  
Vol 1129 ◽  
pp. 201-208
Author(s):  
Ana Cláudia Rosseto Sacco ◽  
Jane Proszek Gorninski
Keyword(s):  
Fly Ash ◽  
Flexural Strength ◽  
Water Absorption ◽  
Axial Compression ◽  
Power Plants ◽  
Polyester Resin ◽  
Mechanical Resistance ◽  
River Sand ◽  
Polyester Resins ◽  
Chemical Attack

The objective of the present study is to investigate the behavior of floor coatings made of recycled isophthalic and orthophthalic type polyester resins along with industrially processed inorganic materials; gravel dust, that is the residue from crushed basaltic rocks, and fly ash generated in coal burning in power plants. The coatings were evaluated by the mechanical resistance tests: flexural strength, axial compression and abrasion and the durability tests: chemical attack, against many harmful agents, and also the water absorption test. The work proposes the use of these coatings as flooring, to be applied in the petroleum and petrochemical industry, which require high-strength materials with excellent chemical resistance. Two types of coatings were produced, one being composed of isophthalic polyester resin as binder, river sand as aggregate and fly ash as filler, and the other composed of orthophthalic polyester resin recycled from PET, river sand and gravel dust as aggregates and fly ash as filler. From the results, it was observed that the floorings reached flexural strength values of 26 MPa and 84 MPa for axial compression, and results below 0.17% for water absorption. The coatings were resistant to chemical attack from acids, bases, salt and hydrocarbons.

Effects of Calcium Carbide Sludge on Properties of Steam Curing Brick Prepared by Extracted Aluminum Fly Ash

2012 ◽  
Vol 174-177 ◽  
pp. 1516-1519
Author(s):  
Li Guang Xiao ◽  
Rui Bo Li ◽  
Shi Ting Zhang ◽  
Hong Liang Hu
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Flexural Strength ◽  
Water Absorption ◽  
Frost Resistance ◽  
Coal Fly Ash ◽  
Calcium Carbide ◽  
Chemical Plants ◽  
Steam Curing ◽  
Ash Residue

Because the fly ash will produce large amounts of the secondary waste emission after the extraction of aluminum, the utilization of the fly ash residue after the extraction of aluminum has great significance. The autoclaved fly ash bricks studied in this paper use CFB ash residue after extraction of aluminum as the main material, and calcium carbide clay which consists mainly of calcium hydroxide is the waste residua of the production of acetylene gas in the chemical plants. This paper analyzes the chemical composition, the mineral composition and the microstructure of the fly ash residue after extraction of aluminum. In the paper, we also study the law and impacts of compressive strength, flexural strength, frost resistance and water absorption, which are made by calcium carbide clay for the autoclaved fly ash bricks. Experimental results illustrate that calcium carbide clay can significantly improve the compressive strength, the flexural strength and the frost resistance of the coal fly ash autoclaved bricks, and significantly reduce its water absorption.

Investigation on the Use of Fly Ash and Residual Rice Husk Ash for Producing Unfired Building Bricks

2015 ◽  
Vol 752-753 ◽  
pp. 588-592 ◽  
Author(s):  
Chao Lung Hwang ◽  
Trong Phuoc Huynh
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Flexural Strength ◽  
Water Absorption ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Test Results ◽  
Design Algorithm ◽  
Potential Applications ◽  
Potential Use

This paper reports on the potential use of fly ash (FA) and residual rice husk ash (RHA) in producing unfired building bricks (UBB) with the application of densified mixture design algorithm (DMDA) method. In this study, little amount of cement (10–15%) was added into the mixtures as binder substitution. Whereas, unground rice husk ash (URHA), an agricultural by-product, was used as partial aggregate replacement (10–20%) in the mixtures. The UBB of 220×105×60 mm in size were prepared and the hardened properties of the bricks were tested including compressive strength, flexural strength, water absorption and bulk density according to Vietnamese standard. Forming pressure of 35 MPa was applied to form the solid bricks in the mold. The test results show that all brick specimens achieved very good mechanical properties. The compressive strength, flexural strength and water absorption of brick specimens were respectively in range of 16.1–22.1 MPa, 2.8–3.5 MPa and 9.5–14.8% and the other properties of the bricks were well conformed to related Vietnamese standard. It was definitely proved many potential applications of FA and RHA in the production of UBB.

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