BINDER CONTENT OF PAVING MIXTURES.
BINDER CONTENT OF PAVING MIXTURES. ( SP : 11 – 1976 ) Object : To determine the binder content in the mix by cold solvent extraction. Apparatus : a) Centrifugal extraction machine electrically operated. b) Balance – 15 kg capacity – sensitivity 0.1gm. c) Cold solvent – Commercial grade of Petorl /Benzene. d) Filter paper e) Oven. Procedure : A representative sample about 1000 gm is exactly weighed and placed in the bowl of the extraction apparatus and covered with commercial grade of benzene. Sufficient time (not more than 1 hour) is allowed for the solvent to disintegrate the sample before running the centrifuge. The filter paper of the extractor is dried, weighed and then fitted around the edge of the bowl. The cover of the bowl is clamped tightly. A beaker placed under to collect the extract. The machine is revolved slowly and then gradually increases the speed, maximum of 3600 rpm. This speed is maintained till the solvent cea...