Research on the Application of Fly Ash in High Water Filling Material

2013 ◽  
Vol 807-809 ◽  
pp. 1124-1128
Author(s):  
Feng Yi Li ◽  
Lei Chen ◽  
Guang Qi Li ◽  
Wei Xin Chen ◽  
Peng Fei Wang
Keyword(s):  
Fly Ash ◽  
Power Plant ◽  
High Efficiency ◽  
High Water ◽  
Packing Material ◽  
Filling Material ◽  
Comprehensive Utilization ◽  
Push Forward ◽  
Water Filling ◽  
Utilization Ratio

Fly ash is a coal-fired waste from the coal-consumed power plant. It has become a great concern as to how fly ash should be treated properly at home. At present, the comprehensive utilization ratio of fly ash is just 30% and utilization ratio of fly ash from coal gangue power plant is less than coal-fired power plant. The effect of different fly ash added to the high-water filling material on the filling result was analyzed and field test of filling in mined-out area was conducted in the Babao vertical shaft + 3211 section of Tonghua coal mining group. The result shows that fly ash of gangue power plant added into the high-water packing material can lower the filling material cost effectively. This research can lead to push forward the utilization of fly ash with high efficiency.

scholarly journals Alkali Fusion-Leaching Method For Comprehensive Processing Of Fly Ash

2017 ◽  
Vol 2 (2) ◽  
pp. 89 ◽  
Author(s):  
A.A. Shoppert ◽  
I.V. Loginova ◽  
L.I. Chaikin ◽  
D.A. Rogozhnikov
Keyword(s):  
Fly Ash ◽  
Power Plant ◽  
X Ray Diffraction ◽  
Water Leaching ◽  
X Ray ◽  
Comprehensive Utilization ◽  
Alkali Fusion ◽  
Wet Chemical ◽  
Promising Source ◽  
Comprehensive Processing

<p>Fly ash, composed of mullite, hematite, amorphous silica and quartz, is a promising source for the recovery of alumina and silica. Desilication with help of NaOH and alkali fusion-leaching method and utilization of alumina and silica in the fly ash for preparation of sodalite and silica white were explored in this research. The samples were characterized by using wet chemical analysis and X-ray diffraction. The optimal extraction of SiO<sub>2</sub> from Reftinskaya power plant fly ash was 46.2% with leaching at 95 <sup>o</sup>C for 3 h. Sodalite was synthesized at 200 °C for 1 h followed water leaching at 95 °C for 1 h. Silica white with specific surface area 180-220 m2/g was prepared by carbonation of the Na<sub>2</sub>SiO<sub>3</sub> solution at 40 <sup>o</sup>C for 90-120 min. The as-prepared silica has a purity of 98,8%.</p><p>The proposed method is suitable for the comprehensive utilization of the fly ash.</p>

scholarly journals Time Effect of Chloride Erosion on Physical and Mechanical Properties of High-Water-Content Materials

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Hai-kuan Wu ◽  
Chang-wu Liu ◽  
Zhao Zhang ◽  
Yi-chen Miao
Keyword(s):  
Water Content ◽  
Physical And Mechanical Properties ◽  
High Water ◽  
The Other ◽  
High Water Content ◽  
Filling Material ◽  
Nacl Solution ◽  
Compression Failure ◽  
Strength Change ◽  
Water Filling

In order to study the characteristics of high water-content materials (HWC) undergoing chloride erosion, we analyzed and summarized changes in strength, elastic modulus, and mass of HWC materials during chloride erosion using specific experimental research, and we also described the compression failure morphologies of HWC materials after erosion. The cuboid specimens developed a horizontal crack between the top and bottom, and the cylindrical specimens developed irregular encryption cracks at the top during increasing pressure. The erosion of HWC materials exposed to calcium chloride (CaCl2) solutions was relatively serious, and the erosion of the cuboid specimens was lower than that of the cylindrical specimens. The strength of HWC materials increased during prolonged erosion, and the strength of the cylindrical specimens in water was the highest, followed by the CaCl2 and sodium chloride (NaCl) solutions. However, the strength change of the cuboid specimens after 28 d was contrary to the above order. In late erosion stages, the HWC materials had better compactness and experienced smaller compressive deformation in water than the other two solutions. In the NaCl solution, the high-water filling material had more pores and a larger deformation than the other solutions.

Review on Development and Application of Gelled Material Filling Mined-Out Area

2016 ◽  
Vol 852 ◽  
pp. 1366-1370
Author(s):  
Yong Liu ◽  
Jie Chen
Keyword(s):  
Fly Ash ◽  
Solid Waste ◽  
Future Development ◽  
High Water ◽  
General Situation ◽  
Filling Material ◽  
Industrial Solid Waste ◽  
Development Direction ◽  
Cementing Material ◽  
Great Development

With the development of the cementing filling technology,the research and application of filling cement materials technology has also made great development. This paper introduces the high water quick-setting filling cementing material, fly ash filling gel material, slag cementing filling material new filling gel materials such as the general situation of the research and application in mine industry analyses the characteristics of different filling cementing materials and limitations, and puts forward the development potential the activity of potential of industrial solid waste to reduce filling gelled material cost and improve the gel material performance will be filling material of the future development direction.

Influence of Addition of Fly Ash on Selected Properties of Concrete for Watertight Tunnel Lining

2015 ◽  
Vol 1100 ◽  
pp. 128-132
Author(s):  
Adam Hubáček ◽  
Tomáš Jarolím ◽  
Petra Macháňová
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Power Plant ◽  
High Water ◽  
Tunnel Lining ◽  
Partial Replacement ◽  
Hardened Concrete ◽  
Depth Of Penetration ◽  
The Czech Republic ◽  
Pressure Water

The paper deals with the topical theme of concrete for watertight tunnel lining, currently solved in the Czech Republic and abroad. The focus is on high water-tightness of concrete for production of these specific structures and other requirements from the point of durability of concrete for watertight tunnel lining. Experimental work followed previous research and was focused on testing of selected properties of concrete for watertight tunnel lining, either with only cement as a binder (reference mixtures) or with partial replacement of cement with fly ash from Detmarovice power plant. Manufactured specimens of fresh and hardened concrete were used for testing of development of compressive strength, depth of penetration with pressure water and development in hydration heat in time.

Study on Proportioning Test of Coal Solid Waste Paste Filling Material

2012 ◽  
Vol 524-527 ◽  
pp. 1086-1091
Author(s):  
Xin Guo Zhang ◽  
Ji Wen Bai ◽  
Heng Wang ◽  
Ning Jiang
Keyword(s):  
Fly Ash ◽  
Solid Waste ◽  
High Efficiency ◽  
Filling Material ◽  
Confined Water ◽  
Bleeding Rate ◽  
Mining Technique ◽  
Comprehensive Mechanization ◽  
Early Strength ◽  
Cementing Material

In order to excavate coal resourses which is under buildings, water bodies, railways and above confined water, a complete technology of new pumping paste comprehensive mechanization mining technique which is safety, high efficiency, high mining rate and environmental protection has been formed, the study on filling material is very important. In this thesis, the uniform experiment is used comprehensively on the proportioning test of mine solid waste such as coal gangue, fly ash etc. The results showed: (1) the collapsed slump of paste will increase obviously with the increase of the content of fly ash; (2) the paste stratified degree will decrease regularly with the increase of the content of fly ash; (3) the paste bleeding rate will reduce obviously with the increase of the content of fly ash; (4) the paste strength will increase gradually with the the increase of cementing material; (5) early strength agent can improve the early strength of filling test blocks to some extent, but the later strength growth is not obvious.

scholarly journals Research on residual strength characteristics of high water materials based on improved H-B criterion

PLoS ONE ◽  
2021 ◽  
Vol 16 (6) ◽  
pp. e0245018
Author(s):  
Lihui Zheng ◽  
Yuejin Zhou ◽  
Mingpeng Li ◽  
Xiaotong Li
Keyword(s):  
Residual Strength ◽  
Shear Failure ◽  
Ductile Failure ◽  
Friction Angle ◽  
Confining Pressure ◽  
High Water ◽  
Strength Characteristics ◽  
Filling Material ◽  
Failure Characteristics ◽  
Water Filling

To develop a new gangue polymer filling material with low compressive ratio, this paper intends to add high water cementing material to the gangue for backfilling. Uniaxial and tri-axial bearing experiments were conducted to study its bearing characteristics and residual strength. Based on Hock-Brown model theory, it is proposed that friction angle φr can be introduced to substitute model parameter mi, and the degree of cohesion loss can characterize the value of s. So the improved H-B model is established to characterize the residual strength of materials with ductile failure characteristics. The results show that the compressive strength of high water filling material increases linearly corresponding to the rise of confining pressure, and its strength characteristics conform to Mohr-Coulomb strength criterion. The ductile failure characteristics of the sample endow it with high residual strength, which in turn qualifies it for underground filling. After the introduction of cohesion and friction angle, the improved H-B criterion can fit the residual strength curve of the high water filling material more competently. The fitting coefficient of the samples with three water contents is 1.00, 0.99, and 1.00, respectively. The improved H-B model of residual strength demonstrates the change rule of residual strength of the samples corresponding to the change of confining pressure; under tri-axial loading, the angle between fracture surface and axial direction becomes larger as the confining pressure rises; and the failure mode of the material transforms from splitting failure to shear failure.

FLY ASH FROM THERMAL POWER PLANT, RAW MATERIAL FOR GLASS-CERAMIC

2013 ◽  
Vol 12 (2) ◽  
pp. 337-342 ◽  
Author(s):  
Firuta Goga ◽  
Roxana Dudric ◽  
Calin Cormos ◽  
Florica Imre ◽  
Liliana Bizo ◽  
...  
Keyword(s):  
Fly Ash ◽  
Power Plant ◽  
Glass Ceramic ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Raw Material ◽  
Plant Raw Material

The Influence of the Ash Addition from Thermal Power Plant on the Mechanical, Thermal and Dielectric Characteristics of Mortars

2018 ◽  
Vol 69 (8) ◽  
pp. 2040-2044
Author(s):  
Georgeta Velciu ◽  
Virgil Marinescu ◽  
Adriana Moanta ◽  
Ladislau Radermacher ◽  
Adriana Mariana Bors
Keyword(s):  
Thermal Conductivity ◽  
Fly Ash ◽  
Power Plant ◽  
Cement Mortar ◽  
Thermal Power ◽  
Total Content ◽  
Ash Content ◽  
Dielectric Losses ◽  
Dielectric Characteristics ◽  
Cement Mortars

The influence of fly ash adittion (90 % fraction [ 100 mm) on the cement mortar characteristics was studied. The XRD, XRF, SEM and FTIR determinations indicated that fly ash used has a hollow microstructure of microsphere and cenosphere whose total content in SiO2, Al2O3 and Fe2O3 is 88.63 % and that of CaO and MgO of 8.55 %. The mechanical, thermal and dielectric determinations made on mortar samples with content of fly ash in the 0-40 % range have highlighted fact that the mechanical strength of cement mortars is maximal at 20 %, the increase in fly ash content leads to a decrease in relative density and thermal conductivity as well as and to increased dielectric losses tgd.

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