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The methylene blue index of a clay indicates

  • A.its coefficient of thermal expansion on heating
  • B.its cation exchange capacity and hence its activity
  • C.the temperature at which it finally dehydroxylates
  • D.the proportion of free quartz that it contains

Answer: B

Dye is adsorbed on the exchange sites, so the quantity taken up scales with the surface charge. It is a quick bench test that distinguishes a swelling clay from a kaolin without any instrument. A high index warns of high water demand before the clay reaches the mixer.

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