Improvement of dispersion stability of filler based on fly ash by adding sodium hexametaphosphate in gas-sealing coating

2019 ◽  
Vol 235 ◽  
pp. 259-271 ◽  
Author(s):  
Huiping Song ◽  
Zeyu Cao ◽  
Wensheng Xie ◽  
Fangqin Cheng ◽  
Khaled A.M. Gasem ◽  
...  
Keyword(s):  
Fly Ash ◽  
Dispersion Stability ◽  
Sodium Hexametaphosphate ◽  
Sealing Coating

Influence of Dispersants on Dispersion Stability of TiO2 Suspensions

2011 ◽  
Vol 356-360 ◽  
pp. 476-479 ◽  
Author(s):  
Yu Mou ◽  
Kun Miao Lü ◽  
Dong Mei Gao
Keyword(s):  
Aqueous Solution ◽  
Experimental Results ◽  
Dispersion Stability ◽  
Sodium Hexametaphosphate ◽  
Aqueous Suspensions ◽  
The Stability

TiO2nanoparticles are prone to aggregate in aqueous solution, which limits its extensive application. Several researches have been carried on the stability of TiO2suspensions. In this study, four common dispersants including ethanol, tetrahydrofuran (THF), polyvinylpyrrolidone (PVP), and sodium hexametaphosphate (SHMP) have been chosen to detect their effects on stability of TiO2aqueous suspensions. The experimental results showed that THF and SHMP were efficient dispersants for TiO2nanoparticles in aqueous solution.

scholarly journals Experimental Study on Coal Fly Ash-Based Gas-Sealing Coating Used for Coal Mine Roadway Walls

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 863
Author(s):  
Huiping Song ◽  
Chunhui Liu ◽  
Fangbin Xue ◽  
Xuhui Wen ◽  
Fangqin Cheng
Keyword(s):  
Fly Ash ◽  
Flame Retardancy ◽  
Coal Mine ◽  
Coal Fly Ash ◽  
Coal Industry ◽  
Gas Emission ◽  
Drying Time ◽  
Mine Roadway ◽  
Air Tightness ◽  
Sealing Coating

Gas-sealing coatings on coal mine roadway walls can effectively repress gas emission and are of importance to the safe operation of coal mining. In this study, the performance of coal fly ash (CFA)-based gas-sealing coatings was investigated, including the aspects of drying time, air tightness, impermeability, flame retardancy and antistatic properties. The results show that coating No. 25 with 60 g ultrafine CFA and 50 g emulsion (curing at 22 °C) had the best air tightness, with a permeability coefficient of 2.95 × 10−13 cm2/(s·Pa). The data obtained through the self-developed air tightness test device agreed well with the detection results of the gas permeameter, thus verifying the accuracy and reliability of the device. The impermeability, flame retardancy and antistatic properties of coating No. 25 conformed the requirements of voluntary national standards GB/T 23445-2009 and coal industry standard MT113-1995, respectively. The CFA-based gas-sealing coating in the pilot test reduced the gas emission intensity by 40%–50%. It could have wide applications in coal mine roadway walls.

Utilization of Liquefying Additives in Clay Fly Ash Grouting Mixtures

2015 ◽  
Vol 1122 ◽  
pp. 229-232
Author(s):  
Ester Helanová ◽  
Magdaléna Kociánová ◽  
Rostislav Drochytka
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Water Content ◽  
Physical And Mechanical Properties ◽  
Sodium Hexametaphosphate ◽  
Coefficient Of Filtration ◽  
Shrinkage Coefficient

Liquefying is an effort to achieve the lowest viscosity at the lowest water content in the mixture. Low water content tends to increase manipulation strength, and consequently to improve the physical and mechanical properties of the resulting mixture after hardening. The aim of this paper is to verify the influence of liquefying additives, namely, sodium hexametaphosphate and tripolyphosphate on properties of clay-fly ash grouting mixtures. Tested properties of these mixtures are viscosity, additional shrinkage, coefficient of filtration and compressive strength.

Effect of surfactants on the properties of a gas-sealing coating modified with fly ash and cement

2018 ◽  
Vol 53 (21) ◽  
pp. 15142-15156 ◽  
Author(s):  
Huiping Song ◽  
Wensheng Xie ◽  
Jianqiang Liu ◽  
Fangqin Cheng ◽  
Khaled A. M. Gasem ◽  
...  
Keyword(s):  
Fly Ash ◽  
Sealing Coating

Characterization of lead-bearing phases in municipal waste combustor fly ash

1996 ◽  
Vol 54 ◽  
pp. 516-517
Author(s):  
L. L. Sutter ◽  
G. R. Dewey ◽  
J. F. Sandell
Keyword(s):  
Fly Ash ◽  
Bottom Ash ◽  
Municipal Waste ◽  
Primary Concern ◽  
Leaching Behavior ◽  
Waste Combustion ◽  
Lead And Cadmium ◽  
Lead Speciation ◽  
Accepted Practice

Municipal waste combustion typically involves both energy recovery as well as volume reduction of municipal solid waste prior to landfilling. However, due to environmental concerns, municipal waste combustion (MWC) has not been a widely accepted practice. A primary concern is the leaching behavior of MWC ash when it is stored in a landfill. The ash consists of a finely divided fly ash fraction (10% by volume) and a coarser bottom ash (90% by volume). Typically, MWC fly ash fails tests used to evaluate leaching behavior due to high amounts of soluble lead and cadmium species. The focus of this study was to identify specific lead bearing phases in MWC fly ash. Detailed information regarding lead speciation is necessary to completely understand the leaching behavior of MWC ash.

INFLAMMATION, CHEMOKINE EXPRESSION, AND DEATH IN MONOCROTALINE-TREATED RATS FOLLOWING FUEL OIL FLY ASH INHALATION

1997 ◽  
Vol 9 (6) ◽  
pp. 541-565 ◽  
Author(s):  
Cheryl R. Killingsworth ◽  
Francesca Alessandrini ◽  
G. G. Krishna Murthy ◽  
Paul J. Catalano ◽  
Joseph D. Paulauskis ◽  
...  
Keyword(s):  
Fly Ash ◽  
Fuel Oil ◽  
Chemokine Expression ◽  
Oil Fly Ash

Effect of Curing Time on the Performance of Fly Ash Geopolymer-Stabilized RAP Bases

2021 ◽  
Vol 33 (3) ◽  
pp. 04021001
Author(s):  
Maheshbabu Jallu ◽  
Sireesh Saride ◽  
Arul Arulrajah ◽  
Subrahmanyam Challapalli ◽  
Robert Evans
Keyword(s):  
Fly Ash ◽  
Curing Time

Review on Experimental Study on Effect of Corrosion In Reinforced Concrete Fly-Ash Beam

2020 ◽  
pp. 92-96
Author(s):  
Shubham N. Dadgal ◽  
Shrikant Solanke
Keyword(s):  
Fly Ash ◽  
Bond Strength ◽  
Structural Damage ◽  
Pullout Test ◽  
Partial Replacement ◽  
Structural Members ◽  
Accelerated Corrosion ◽  
Resistivity Method ◽  
Electrical Resistivity Method ◽  
Structural Failures

In modern days for structures in coastal areas it has been observed that the premature structural failures are occurs due to corrosion of the reinforcements of the designed structural member. The corrosion causes the structural damage which in turn leads to reduction in the bearing capacity of the concerned structural members. The aim of this study was to study the effect of partial replacement of fly ash to minimize the corrosion effect. Beams were designed and corroded by using artificial method known accelerated corrosion method. The beams were then tested for flexural and bond strength. Also the weight loss of the reinforced bars was been determined using electrical resistivity method. The fly ash will replace by 10% and 15%.The strength will calculate at varying percentage of corrosion at 10% and 15%. Beams will cast at M25 grade concrete. The flexural strength will test by using UTM and the bond strength will calculate using pullout test.

A Review on Utilization of Fly- Ash and Pond-Ash as a Partial Replacement of Cement in Concrete Mix Design

2018 ◽  
pp. 413-418
Author(s):  
Harshkumar Patel ◽  
Yogesh Patel
Keyword(s):  
Fly Ash ◽  
Electricity Generation ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Thermal Power ◽  
Strength Test ◽  
Partial Replacement ◽  
Pond Ash ◽  
Research Activities ◽  
Ash Disposal

Now-a-days energy planners are aiming to increase the use of renewable energy sources and nuclear to meet the electricity generation. But till now coal-based power plants are the major source of electricity generation. Disadvantages of coal-based thermal power plants is disposal problem of fly ash and pond ash. It was earlier considered as a total waste and environmental hazard thus its use was limited, but now its useful properties have been known as raw material for various application in construction field. Fly ash from the thermal plants is available in large quantities in fine and coarse form. Fine fly ash is used in construction industry in some amount and coarse fly ash is subsequently disposed over land in slurry forms. In India around 180 MT fly is produced and only around 45% of that is being utilized in different sectors. Balance fly ash is being disposed over land. It needs one acre of land for ash disposal to produce 1MW electricity from coal. Fly ash and pond ash utilization helps to reduce the consumption of natural resources. The fly ash became available in coal based thermal power station in the year 1930 in USA. For its gainful utilization, scientist started research activities and in the year 1937, R.E. Davis and his associates at university of California published research details on use of fly ash in cement concrete. This research had laid foundation for its specification, testing & usages. This study reports the potential use of pond-ash and fly-ash as cement in concrete mixes. In this present study of concrete produced using fly ash, pond ash and OPC 53 grade will be carried. An attempt will be made to investigate characteristics of OPC concrete with combined fly ash and pond ash mixed concrete for Compressive Strength test, Split Tensile Strength test, Flexural Strength test and Durability tests. This paper deals with the review of literature for fly-ash and pond-ash as partial replacement of cement in concrete.

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