Pre-Bagged Concrete | Garden Supply Hardscapes in San Jose and .PORTLAND CEMENT Mix 1 part cement to 5 parts sand and gravel mix to make concrete mix. For mortar mix, 1 part cement to 3 parts mortar sand and one tenth.gravel mix parts,What are the Proper Concrete Mix Proportions? - BN ProductsSep 25, 2017 . Cement is the bonding agent that holds the aggregate and sand of concrete . The safest bet for any concrete mix is four-two-one: four parts.
gravel mix parts