Originally Posted by 32vld
Adding sand is a fallacy. Fine particle lime and large particle sand because of difference in size are one of the reasons when mixed they bind into concrete.
Adding sand will only make the soil more compact unless you remove half the clay soil and replace it with sand. That's a lot of sand.
Adding compost will keep the soil from getting hard, improving drainage, and adding nutrients.
Soil Structure is difficult to accomplish with the 'platelet' properties of clay soils... the open spaces provided by the addition of OM and larger particles together gives the aggregates a chance to do more than turn to black 'platelets' for even slimier textures...
Ideal soils include both
large and small particles, with adequate OM to bind them in proper order to form aggregates that allow for proper soil functions...