Abstract
Author examined the properties of Daubpax, a material for cupola lining repairs, and used it in the practical operations.
The following results have been obtained.
(1) Daubpax is a mixture of natural silica and artificial silica of high grade, and consists of coarse grains retained on the 10 mesh sieve and fines passed through the 100 mesh sieve.
(2) The green compressive strength is best in case of 6 to 8% moisture added.
(3) Highest resistance to erosion has been obtained in case of 4 to 6 day's tempering, and the eroded volume is less than that of the pyrophyllite bricks, we have used.
(4) As the material of cupola lining repairs, Daubpax has shown the equal or better results in comparison with the pyrophyllite bricks.
(5) Comparing the cost of cupola lining repairs between the two, Daubpax is more expensive by reason of imported goods, but it can save the work time to repair.
