Comparison of Methods to Measure Adsorptive Capacity of Coal Fly Ash
Although there are many benefits associated with the use of coal fly ash in portland cement concrete, a common issue is the adsorption of air-entraining admixtures by residual carbon, which adversely affects the process of air entrainment. Currently, loss on ignition (LOI) is employed to estimate th...
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| Veröffentlicht in: | ACI materials journal 2019-07, Vol.116 (4), p.107-112 |
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| creator | Anzalone, G. C. Diaz-Loya, Ivan Minkara, Rafic Y. Sutter, Lawrence L. |
| description | Although there are many benefits associated with the use of coal fly ash in portland cement concrete, a common issue is the adsorption of air-entraining admixtures by residual carbon, which adversely affects the process of air entrainment. Currently, loss on ignition (LOI) is employed to estimate the total amount of carbon present. The LOI test does not measure the adsorption properties of the carbon, which is the important characteristic. The carbon present in fly ash may or may not be activated and the degree of activation can vary. Therefore, two ashes with the same LOI can have very different adsorption capacities. This paper presents a comparison of methods that have been developed to measure the adsorption capacity of a coal fly ash. These include the iodine number, direct adsorption isotherm, and a fluorescence-based method (FBM). The results of these methods are compared and the relative merits of each methodology are discussed. Keywords: adsorption; air-entraining admixture; air entrainment; fly ash. |
| doi_str_mv | 10.14359/51716715 |
| format | Article |
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C. ; Diaz-Loya, Ivan ; Minkara, Rafic Y. ; Sutter, Lawrence L.</creator><creatorcontrib>Anzalone, G. C. ; Diaz-Loya, Ivan ; Minkara, Rafic Y. ; Sutter, Lawrence L.</creatorcontrib><description>Although there are many benefits associated with the use of coal fly ash in portland cement concrete, a common issue is the adsorption of air-entraining admixtures by residual carbon, which adversely affects the process of air entrainment. Currently, loss on ignition (LOI) is employed to estimate the total amount of carbon present. The LOI test does not measure the adsorption properties of the carbon, which is the important characteristic. The carbon present in fly ash may or may not be activated and the degree of activation can vary. Therefore, two ashes with the same LOI can have very different adsorption capacities. This paper presents a comparison of methods that have been developed to measure the adsorption capacity of a coal fly ash. These include the iodine number, direct adsorption isotherm, and a fluorescence-based method (FBM). The results of these methods are compared and the relative merits of each methodology are discussed. 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This paper presents a comparison of methods that have been developed to measure the adsorption capacity of a coal fly ash. These include the iodine number, direct adsorption isotherm, and a fluorescence-based method (FBM). The results of these methods are compared and the relative merits of each methodology are discussed. 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The carbon present in fly ash may or may not be activated and the degree of activation can vary. Therefore, two ashes with the same LOI can have very different adsorption capacities. This paper presents a comparison of methods that have been developed to measure the adsorption capacity of a coal fly ash. These include the iodine number, direct adsorption isotherm, and a fluorescence-based method (FBM). The results of these methods are compared and the relative merits of each methodology are discussed. Keywords: adsorption; air-entraining admixture; air entrainment; fly ash.</abstract><cop>Farmington Hills</cop><pub>American Concrete Institute</pub><doi>10.14359/51716715</doi><tpages>6</tpages></addata></record> |
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| source | American Concrete Institute Online Journal Archives |
| subjects | Activated carbon Adsorption Adsorptivity Air entrainment Air-entraining admixtures Analysis Automation Cement Cements (Building materials) Chemical oxygen demand Coal-fired power plants Concrete Concretes Fluorescence Fly ash Hydration Iodine Measurement methods Methods Pore size Portland cements Retirement benefits |
| title | Comparison of Methods to Measure Adsorptive Capacity of Coal Fly Ash |
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