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Abstract
Based on the principle of ENV 196-4 “Methods of testing cement – Part 4: Quantitative determination of constituents” or Chinese Standard GB/12960-2007 “quantitative measurement of mineral admixtures in cement”, a method was developed for quantitative determination of fly ash (FA) in fresh cement mortars and concretes. The effects of several factors, such as residue content of FA on an 80-μm sieve, silt content of aggregates, water-reducing agent, and hydration time on the measurement were studied. Experimental results indicated that during the first 3 h, the hydration time did not show an effect on measured results, but the residues of FA on an 80-μm sieve and silt contents of aggregates demonstrated significant effects on the measured results. The results obtained from the developed method were very close to the actual contents after the consideration of the residue content of FA and silt content of aggregates. Therefore, the method developed can be effective for quality control and analysis of fresh concrete.