diff --git a/src/paveit/datamodels/norm_specification.py b/src/paveit/datamodels/norm_specification.py
index e538f27..63e927b 100644
--- a/src/paveit/datamodels/norm_specification.py
+++ b/src/paveit/datamodels/norm_specification.py
@@ -85,3 +85,28 @@ class BitumenParameterLimitsStrassenbaubitumen(BitumenParameterLimitsBaseEnum):
     hardening_resistance_masschange_operator = EnumField(RelationalOperatorsEnum, default=RelationalOperatorsEnum.lt)
     hardening_resistance_masschange_max = FloatField(min_value=0, max_value=100)
      	 
+# Asphalt
+class SievePassage(EmbeddedDocument):
+    wide = FloatField(required=True)
+    passage = FloatField(required=True)
+
+class AsphaltParameterLimitsBaseEnum(EnumerateBase):
+    pass
+
+class AsphaltParameterLimitsAsphalttragschicht(AsphaltParameterLimitsBaseEnum):
+    
+    name = StringField()
+    category = EnumField(BitumenCategoryEnum, required=True)
+    norm =  LazyReferenceField(NormDocumentBitumen, required=True)
+    
+    
+    #Gestein
+    sieve_passage = ListField(EmbeddedDocumentField(SievePassage))
+    
+    # Bitumen
+    bitumen_type = ListField(LazyReferenceField(BitumenParameterLimitsBaseEnum), required=True)
+    min_bitumen_content = FloatField(min=0, max=100)
+    
+    min_voids_content = FloatField(min=0, max=100)
+    max_voids_content = FloatField(min=0, max=100)
+    
\ No newline at end of file