Review of: "Effective use of Waste Materials: A Case Study of Utilization of Fly Ash in Flexible Pavement Structures"
Résumé
In this paragraph "Classes of Fly Ash.Based upon the proportions of its chemical constituents, fly ash can be classified into class 'C' and class 'F'.Although researchers have not limited themselves to this classification……….",the authors should highlight the methods of classification of fly ash (ASTM C618-12 and Canadian Standards Association).-According to the ASTM C618-12, the classification is based on the chemical composition of fly ash.The major delimiter for this classification is the sum of silica, aluminium, and iron oxide percentages in the fly ash, being a minimum of 70% for a Class F and a minimum of 50% for a Class.According to the Canadian Standards Association, the classification of fly ash is based on the ratio of CaO, of which fly ash is generally low-calcium (Class F) when CaO is less than 10%.Please check and cite the previously recommended reference -Table 1 should include at least 5-10 different chemical compositions from different studies -In this sentence "while class 'F' is produced from lignite or sub-bituminous coal; the former class exhibits pozzolanic properties and the latter possesses cementitious properties [15].",please replace reference [15] by an ISI Web of Science reference
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