To a waterproofing apply more often than others the bitumen mastics prepared from oil bitumen of mark БН70/30 or an alloy of bitumens of low and high marks. Mixing them among themselves and with napolniteljami in certain parities, receive mastics of necessary mark.
At great volume of consumption of mastics the building organisations create the specialised centralised installations for their preparation. If the expense of mastics is insignificant, them prepare directly on a building site. For this purpose apply bitumovarochnye coppers capacity 0,6м 3 with heating by any kind of fuel and special installations by capacity 2,8м 3 (fig. 107) to a warming up or preparation of bitumen mastics, their giving on pipelines and the mechanised drawing on an isolated surface.
a Fig. 107. Installation for a warming up and giving on pipelines of bitumen mastic :
1 - the rotary crane, 2 - dvuhstvorochnaja a cover, 3 - a fuel tank, 4 - an atomizer of giving of fuel, 5 - the hatch for copper cleaning, 6 - toplivoprovod, 7 - the manual pump, 8 - a gangway, 9 - a copper, 10 - a hose, 11 - a fishing tackle for mastic drawing
The bitumen Loaded into a copper rasplavljajut also dehydrate, maintaining it at 100°Р. (If on a surface razogretoj mastics are foam, means, water has not evaporated). Then raise temperature of bitumen to 180°Р. Also add in a copper at continuous hashing, dry napolnitel, preliminary passed through a sieve with cells 4X4мм and warmed up to 110°Р. Simultaneously with napolnitelem, enter antiseptirujushchie additives (kremneftoristyj or fluoric sodium) in number of 3... 5 % from weight of the bitumen knitting. Antiseptirujushchie additives serve for increase of firmness against rotting of the rolled materials having an organic (paper) basis. If at loading napolnitelja the weight in a copper starts to foam, loading stop, while level of a boiling layer will go down, i.e. The superfluous moisture will not evaporate yet. After loading of last portion napolnitelja, mastic cook before reception of homogeneous weight and full subsidence of foam.
The Temperature of mastic during its drawing should be 160°Р. (At preparation it heat up on 15...20°Р. Above this temperature).