BS EN 12274-3:2018 pdf download

BS EN 12274-3:2018 pdf download.Slurry surfacing – Test methods Part 3: Consistency
1 Scope
This European Standard specifies a test method for determining the consistency of slurry surfacing mixtures. This test is dedicated to Slurry Seals (D≤4mm).
NOTE 1 The method can be used as a mix design aid to determine the amount of water required to form a stable, workable mixture.
NOTE 2 To obtain the correct consistency, it can be necessary to repeat the test with different known percentages of water.
This European Standard applies to slurry surfacing for roads, airfields and other trafficked areas.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 1097-5, Tests for mechanical and physical properties of aggregates一Part 5: Determination of the water content by drying in a ventilated oven
3 Apparatus
1) Mould, made from sheet metal or hard plastic, in the form of a frustum of a cone (see Figure 1), of height (75+1) mm, inside diameter at the top of (40 + 1) mm, and an inside diameter at the bottom of(90+1)mm.
4 Procedure
1) Wet aggregates may be used, preferably at their own natural moisture or dry. In case of natural moisture, determine the water content W by drying in an oven at a temperature of (110+5) °C until constant mass is achieved, according to EN 1097-5. 2) To homogenize the bitumen emulsion, stir it manually. 3) The test temperature shall be at ambient temperature, (23+5) °C. 4) Weigh a sample of (400+5) g of dry aggregate or (400 x (100+W)/100士5] g of wet aggregates (where W is the water content of aggregates) and place it in the beaker or container. Weigh and add any reactive filler needed in the mixture (e.g. cement or hydrated lime). Add any predetermined quantities of additives and pre-wetting water and record the amount of components in grams (accuracy:+1 g). 5) Add the selected amount of bitumen emulsion to the other mixture components in the beaker and use the stirring rod to mix until the mix is homogeneous. 6) Place the non-absorbent paper flow sheet on a level table. Place the mould with its base centred on the flow sheet. Fill the mould with the slurry mixture, strike the top surface level with the top of the cone using a spatula and immediately lift the mould clear of the mixture with a smooth vertical motion.