As we all know, micro-surfacing and slurry sealing are both relatively common preventive maintenance techniques, and the manual methods are also similar, so many people don’t know how to distinguish them in actual use, so the editor of Sinoroader would like to take this opportunity Let me tell you the difference between the two.

1. Applicable to different road surfaces: Micro-surfacing is mainly used for preventive maintenance of highways and filling of light ruts. It is also suitable for anti-slip wear layers of newly built highways. The slurry seal is mainly used for preventive maintenance of secondary roads and below, and can also be used in the lower seal of new roads.
2. The quality of aggregates is different: the abrasion loss of the aggregates used for micro-surfacing should be less than 30%, which is more stringent than the requirement of no more than 35% for aggregates used for slurry sealing; the aggregates used for micro-surfacing pass through a 4.75mm sieve The sand equivalent of the synthetic mineral material should be higher than 65%, which is significantly higher than the 45% requirement when used for slurry sealing.
3. Different technical requirements: the slurry seal uses different types of unmodified emulsified asphalt, while the micro surface uses modified fast-setting emulsified asphalt, and the residue content is higher than 62%, which is higher than that of the slurry seal. Use emulsified asphalt higher than the requirement of 60%.
4. The design indicators of the two mixtures are different: the micro-surface mixture must meet the wet wheel wear index after being soaked in water for 6 days, and the slurry seal is not required; the micro-surface mixture can be used for rut filling, and the mixture has a load wheel rolling requirement of 1000 The lateral displacement of the sample after the test was lower than the 5% requirement, while the slurry seal layer did not.
It can be seen that although micro-surfacing and slurry sealing are similar in some places, they are actually very different. When using them, you must choose according to the actual situation.