Record elongation at rupture for each briquette; the thread must stay submerged 25–50 mm deep \u2014 adjust bath density if it floats or sinks.<\/li>\n<\/ol>\nCalculation & Reporting<\/h2>\n
Report the mean of three briquettes to the nearest centimetre with test temperature and speed. If results scatter beyond the standard’s repeatability, repeat the set.<\/p>\n
Acceptance Criteria<\/h2>\n
Paving specifications typically require minimum 75–100 cm at 25 °C for 60\/70 and 80\/100 grades; many specs simply state “100+”. Oxidised or blown bitumens give much lower values by design.<\/p>\n
Frequently Asked Questions<\/h2>\nWhat does low ductility indicate?<\/h3>\n
Age-hardened, overheated or wax-rich binder with poor cohesion \u2014 pavements built with it are prone to fatigue and low-temperature cracking. Cross-check with penetration and softening point before rejecting a batch.<\/p>\n
Why must the briquette thread stay mid-depth in the bath?<\/h3>\n
Floating or sinking threads experience buoyancy forces that add or subtract tension, distorting the elongation. Adjust water density with salt (to raise) or alcohol\/glycerol mixtures per the standard.<\/p>\n
Recommended Apparatus<\/h2>\n
NL Scientific manufactures the Advance Digital Ductilometer Apparatus (TENSILE Load Series)<\/a> for this method. Browse the full Bitumen & Asphalt Testing Equipment<\/a> range or request a quotation<\/a> from our engineers.<\/p>\n
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