scholarly journals ANALYSIS OF PARTICLE CHARACTERISTIC FACTORS AFFECTING THE ACTIVITY OF FLY ASH

2019 ◽  
Vol 72 (1) ◽  
pp. 70-76
Author(s):  
Naoto NAKAI ◽  
Tomoyuki HIKIDA ◽  
Yoshifumi HOSOKAWA ◽  
Syunichiro UCHIDA
Keyword(s):  
Fly Ash ◽  
Factors Affecting ◽  
Particle Characteristic

Factors affecting the sorption of trivalent chromium by zeolite synthesized from coal fly ash

2008 ◽  
Vol 322 (1) ◽  
pp. 13-21 ◽  
Author(s):  
Yanming Sui ◽  
Deyi Wu ◽  
Dalei Zhang ◽  
Xiangyong Zheng ◽  
Zhanbo Hu ◽  
...  
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Trivalent Chromium ◽  
Factors Affecting

Influencing Factors and New Developments of Fly Ash Based Geopolymer

2013 ◽  
Vol 831 ◽  
pp. 62-66
Author(s):  
Chen Si ◽  
Zhu Ge Yan ◽  
De Ping Xu
Keyword(s):  
Fly Ash ◽  
Lightweight Concrete ◽  
Material Selection ◽  
Cementitious Material ◽  
Raw Material ◽  
New Developments ◽  
Factors Affecting ◽  
High Calcium ◽  
Raw Material Selection ◽  
Geopolymer Composites

This paper presents a discussion of factors affecting the performance of fly ash based geopolymer, and some recent innovations on fly ash based geopolymer. The characteristics of fly ash based geopolymer are discussed in terms of the effects of raw material selection, alkaline activators, and curing procedures. Nowadays, researchers have used geopolymer as a cementitious material to develop innovative geopolymer materials, such as porous, fibre reinforced and foam fly ash based geopolymer concrete, which are greener than the traditional cementitious material. The high-calcium fly ashes could be used to produce porous fly ash based geopolymer composites with satisfactory mechanical properties. The addition of fibres increases greatly the ductility of geopolymer. Foam can be added to the geopolymeric mixture to produce lightweight concrete. However, the manufacturing of fly ash-based geopolymer foam concrete has not been explored too much.

scholarly journals Development of Coal Mine Filling Paste with Certain Early Strength and Its Flow Characteristics

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Feng Zhang ◽  
Jinxiao Liu ◽  
Haiming Ni ◽  
Wenxin Li ◽  
Yongle Liu
Keyword(s):  
Fly Ash ◽  
Coal Mine ◽  
Setting Time ◽  
Flow Characteristics ◽  
Coal Gangue ◽  
Practical Significance ◽  
Range Analysis ◽  
Factors Affecting ◽  
Early Strength ◽  
Backfill Strength

In coal mine paste filling technology, geomaterials like coal gangue and fly ash are used as the main component, and cement is applied as the cementing material. In the mining production, mining-and-filling is a cyclic work, where the filling immediately after mining and mining immediately after filling. Long solidification time after filling will affect mining; consequently, the paste should have early strength. In addition, the prepared paste will be conveyed to goaf through the pipeline. The paste flow characteristics will change to some extent in the conveying process, and there is uncertainty about whether the paste can meet the requirements of pumpability and strength. Therefore, the influence of pipeline conveying on flow characteristics of paste before filling the goaf should be taken into consideration. Based on the above two points, this paper studies the paste strength, backfill strength, and pumpability parameters in coal mine paste filling and determines the early and later strength of coal mine paste, as well as the pumpability parameters such as slump degree, segregation degree, setting time, and paste gradation. With the determined mass proportion of coal gangue, fly ash, and silicate cement, the orthogonal test was carried out with three factors including gypsum content, the content of early strength agent (Na2SO4), and the mass concentration, and at three levels. The factors affecting paste flow characteristics were determined by range analysis, and the factors affecting the paste’s early strength were determined by the XRD test and SEM test on its microstructure. With paste proportioning and pipeline conveying simulation system, taking slump, segregation degree, backfill strength, and other parameters as indicators, we obtain the influence law of pipeline conveying on the flow characteristics of paste. The research has great theoretical and practical significance for developing coal paste with early strength and its flow characteristics.

Performance Optimization of Cement-Fly Ash Grouting Material Based on Response Surface Methodology

2021 ◽  
Vol 1036 ◽  
pp. 337-344
Author(s):  
Lin Lin Wang ◽  
Xiang Bin Xu ◽  
Qing Song Zhang ◽  
Shi Yi Li
Keyword(s):  
Response Surface Methodology ◽  
Fly Ash ◽  
Response Surface ◽  
Performance Optimization ◽  
Reducing Agent ◽  
Sand Fly ◽  
Hydration Reaction ◽  
Factors Affecting ◽  
And Performance ◽  
Grouting Materials

Filling grouting is effective to control the overlying strata movement and surface subsidence in mining and tunnel engineering.Grouting material is used in grouting reinforcement projects. In this experiment,based on the mechanical properties of grouting materials, Expert Design and response surface methodology (RSM) is used to optimize the mix proportion of grout materials. The sand-fly ash ratio ,water reducing agent addition are researched as variables, and the 3D response surface is established between the factors and the performance indicators. Microstructure explains the mechanism of factors affecting performance indicators.The results show the relationship between factors and performance can be well fitted by RSM.The order of significance on compressive strength and solidification ratio is sand-fly ash ratio＞water reducing agent addition and the order of significant on viscosity is water reducing agent addition＞sand-fly ash ratio.Response surface methodology accurately describes the functional relationship between the target value and the design variables.Microstructure shows hydration reaction and the secondary hydration reaction of fly ash will be carried out after cement-fly ash mixed, and the addition of fly ash is especially important for grout material properties.

Physical factors affecting the mutagenicity of fly ash from a coal-fired power plant

Science ◽  
1979 ◽  
Vol 204 (4395) ◽  
pp. 879-881 ◽  
Author(s):  
G. Fisher ◽  
C. Chrisp ◽  
O. Raabe
Keyword(s):  
Fly Ash ◽  
Power Plant ◽  
Physical Factors ◽  
Factors Affecting

Survey on Factors Affecting Impermeability of Waterproof Concrete

2011 ◽  
Vol 250-253 ◽  
pp. 1320-1323
Author(s):  
Yi Jin Li ◽  
Yun Li Gong ◽  
Jian Yin
Keyword(s):  
Fly Ash ◽  
Ash Content ◽  
Raw Material ◽  
Factors Affecting ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Mix Proportion

This paper describes the influence of raw material, water-cement ratio, sand ratio, cement-sand ratio and fly ash content on impermeability of waterproof concrete. The value ranges of several important mix parameters are summarized, that provides the reference to select the parameters of mix proportion of waterproof concrete for subway.

scholarly journals Factors Affecting the Setting Time of Fly Ash-Based Geopolymer

2016 ◽  
Vol 841 ◽  
pp. 90-97 ◽  
Author(s):  
Antoni ◽  
Stephen Wibiatma Wijaya ◽  
Djwantoro Hardjito
Keyword(s):  
Fly Ash ◽  
Initial Temperature ◽  
Ph Value ◽  
Setting Time ◽  
Chemical Properties ◽  
Curing Temperature ◽  
Factors Affecting ◽  
Ph Values ◽  
Physical And Chemical ◽  
And Chemical Properties

Fly ash is a waste from coal burning, that are generated with fluctuation both in its physical and chemical characteristics. This characteristics of fly ash when used in the making of geopolymer concrete will greatly affect the final products obtained. The pH value measured in fly ash, according previous research, can influence the setting time of geopolymer and fly ash with high pH values can cause flash-setting in the concrete. Understanding more clearly about the factors that affect the setting time of fly ash based geopolymer is important for further progress and development of the material. It was found that factors that influence the setting time of geopolymer was not only from the physical and chemical properties of the fly ash itself. Other factors such as composition and mix design, manufacturing process and environmental conditions can also affect its setting time. The experimental results showed that fly ash particle size, CaO and MgO content, in addition to ratio of sodium silicate and sodium hydroxide in the alkali solution, molarity of NaOH, initial temperature of the mixture, curing temperature, and mix volume could potentially influence the setting time of the geopolymer mixture.

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