Mix design procedure for slurry seal

The mix design procedure for slurry seal according to ASTM D 3910 (2011) requires the execution of the following tests (a) consistency test, (b) set time test, (c) cure test and (d) wet track abrasion test, all described in ASTM D 3910 (2011). 

A similar mix design procedure is also proposed by ISSA A105 (2010). 

The consistency test is used to determine the optimum mix design (proper ratio of aggregate, filler, water and bitumen emulsion) as related to proper consistency for pavement surface placement. 

Several mixtures are made using dried aggregate and various ratios of bitumen emulsion, water and additive (Portland cement or lime, and chemical additive). Mixing time shall be within the range of 1 to 3 min when mixed at 25°C 1°C. After mixing, the slurry mix is placed in a conical form, which is then removed and allows it to flow on a metal plate having engraved concentric circles. 

A flow of 2 to 3 cm is considered to be the consistency normally required for a workable field mix. 

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