Addition of calcite enhanced the melting
temperatures of the barley straw ash, but it was less effective compared to kaolin. In comparison to barley
husk ash, rather similar sintering degree evaluation results were obtained from mixtures of barley straw
ash and additives. The effects of additives on the two reference ashes behaviors observed in the present
work agree well with experimental results from previous studies. The kaolin and calcium based additives,
such as calcite, lime and limestone, were found efficient in decreasing the sintering degree of ashes from
different agricultural residues