DETERMINATION OF ASH CONTENT OF LIQUID ADMIXTURE (IS:9103-1999)

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Objective

The ash content which gives an indication of inorganic constituents is determined by igniting the admixture at 6000C to remove any organic material. 

Reference Standards

IS : 9103-1999 – Concrete admixtures specification

Equipment & Apparatus

  • Oven(3000C)
  • Bottle
  • Balance(0-10kg)

 Procedure

  1. About 1 g of sample is placed in a porcelain crucible. The crucible is then placed over a steam water bath or an air oven at 900 C to remove the liquid portion by evaporation.
  2. Then the solid contents with the crucible is transferred to a muffle furnace at room temperature and is heated gradually so that the temperature reaches 3000 C in 1 h and 6000 C in a further 2 to 3 h period. The temp of the furnace is maintained at 600±250 C for 16 to 24 h.
  3. The crucible is removed from the furnace and allowed to cool. After cooling for 30 min the crucible plus lid and contents is weighed to the nearest 0.001 g. 

Calculation

Calculate the ash content in the original mass of the admixture

Weight of crucible and lid = W1

Weight of crucible, lid and sample = W2

Weight of crucible, lid and ash = W3

admixture ash content 1

Reports

The result is reported to nearest whole number. 

Safety & Precautions

  • Use hand gloves while removing containers from oven after switching off the oven.
  • Equipment should be cleaned thoroughly before testing & after testing.
  • To check electric supply of the instrument.
  • To wear safety shoes & aprons at the time of test.

8 thoughts on “DETERMINATION OF ASH CONTENT OF LIQUID ADMIXTURE (IS:9103-1999)”

  1. Dear SIR
    Ash content (%by mass) 3.68 % (within 5% of the value stated by the manufacturer)
    Manufacture value in MTC is ( DMC) % BY mass is 36.92 (MTC Value)
    How do they calculate 5% ?
    I request you to how do they calculate? i am awaiting for your reply.

    Regards
    Hemant Mahulkar

    Reply

    • Dear Hemant,

      ASh Content = 3.68%
      as per IS 9103 = +/- 5 %
      = 3.68*5/100 = 0.184 = 0.18
      3.68 +/- 0.18 = (3.86-0.18 and 3.68+0.18)
      = 3.50 – 3.86 is your ash contetn range as per IS 9103
      same way you can calulate for DMC.

      Regards,
      M. Panchal
      +91-9167181519

      Reply

  3. @ Suryakanta why ash content is important in chemicals? What if ash content of any particular liquid goes beyond its limit value?

    Reply

    • Yes they both are different…solids are obtained or rather determine the solid content by evaporating water from the admixture at a temperature of above 100 degree Celsius where as for finding ash content we burn the admixture at 600° celcius to obtain inorganic content.

      Reply

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