Short answer. No, not on your own say-so. The Civil Code confines the owner of the dominant estate to using the easement for the benefit of the property originally contemplated, and in the manner already established. A new purpose, a different property, or a heavier use needs a fresh agreement.
What the law says
The owner of the dominant estate cannot use the easement except for the benefit of the immovable originally contemplated. Neither can he exercise the easement in any other manner than that previously established.
Civil Code, Article 626 — Use Limited to the Original Purpose. Read the full provision →
The rule: an easement is fixed by its purpose
Article 626 of the Civil Code puts it in two sentences. The owner of the dominant estate cannot use the easement except for the benefit of the immovable originally contemplated. Neither can he exercise the easement in any other manner than that previously established. An easement is not a general licence over a neighbour's land. It is a specific burden, created for a specific property and a specific use, and it stays that size. The two limbs work separately: the first ties the easement to the land it was granted for, the second ties it to the way it has actually been exercised.
What the first limb blocks
The benefit must run to the immovable originally contemplated. A right of way granted for one lot therefore cannot be used to serve another lot the dominant owner later buys behind it, even where he owns both and the route would be identical. The same difficulty appears when the dominant land is subdivided and sold in pieces, or when a farm lot turns into a subdivision or a commercial yard: the property being served is no longer the property for which the burden was created. If the neighbouring parcel needs access, it needs an arrangement of its own.
What the second limb blocks
The manner previously established matters just as much as the purpose. A footpath used by people and animals does not quietly become a road for delivery trucks. A drainage easement for household water does not become an outfall for a car wash. A passage used in daylight does not become a round-the-clock service route. Increasing the intensity of use is itself a change in manner, even when the purpose has not changed at all. The question a servient owner will put before a court is simple: is the burden he is now bearing the burden that was created?
What to do if you genuinely need more
The route is agreement, not gradual expansion. If your use has outgrown the easement, negotiate an amended grant, reduce it to a document, and have it annotated on the title so it binds later owners instead of depending on a neighbour's patience. Expect to pay for the larger burden. Doing it the other way round is costly: the servient owner can go to court to stop the excess use, and years of unchallenged over-use do not ripen into a right merely because nobody complained. Start by reading the deed or decision that created the easement — it usually states the purpose, width and route, and that document, not habit, defines what you may do.