BS EN 12846-1:2011 pdf free.Bitumen and bituminousbinders – Determinationof efflux time by theefflux viscometer Bituminous emulsions.
BS EN 12846-1 Aqueous solution with a 1 % mass of alkyltrimethylammonium chloride preferably, or aqueous solution with anominal 1 % mass of cetyltrimethylammonium bromide shall be used for testing cationic emulsions. Thosesurfactants shall be solubilised with 1 % mass of hydrochloric acid (HcI)(HCl concentration shall beapproximately equal to 1 moll).The actual aqueous phase may be used if available on site, in case of routinetests or for simplicity.
NOTE1 Sc stands for “cationic solution” as this solution is used for testing cationic emulsions.
NOTE2 The solution of 1 % of cetyltrimethylammonium bromide should be prepared slightly above 25 °C(but nothigher than 30 °C). Then it should be stored at a temperature of (25+1)C before test.
Usual laboratory apparatus and glassware, together with the following:Efflux viscometer (see an example of viscometer on Figure 1) consisting essentially of a cup with anorifice in the centre of the base which may be closed by a ball-and-socket valve (see Figure 2).
Three forms are required,differing only in the size of the orifice (10 mm, 4 mm and 2 mm).For otherdimensions of the cup and the bal-valve,see Figure 3. The cup cylinder shall be made of brass. The ballvalve should be made of corrosion-resistant metal, with a ball on a rod, a levelling peg attached to the rod anda hemispherical top by means of which the valve may be supported in a vertical position.
The viscometer cups shall be equipped with suitable corks or caps for closing the orifices with the ball valve inposition， and some means of covering the cups (e.g. lids) to prevent evaporation of water and minimizesurface cooling effects.
The viscometer-cup holder shall be capable of:supporting one or more cups in a vertical position;
providing a valve support to hold the valve at least 16 mm vertically above the orifice of the cup duringefflux of the test material.
NOTE 1 To enhance resistance to wear and corrosion of the ball and socket valve, the bottom of the cup may be madefrom a different, corrosion resistant, material and screwed to the brass tube. It is then advised to use the same material,such as for instance phosphor-bronze, for the cup bottom and the ball valve. Wrought nickel alloy with copper or metalsNiCu30 in accordance with ISo 9722 are possible materials for the rod of the ball valve.BS EN 12846-1 pdf download.