Dense Graded Aggregate vs. Crushed Stone for Sidewalk Construction
Dense Graded Aggregate vs. Crushed Stone for Sidewalk Construction
(OP)
What granular sub-base material placed on top of the prepared subgrade is the best cushion for uniform support by bridging over minor subgrade defects for sidewalk construction? 3/4" Dense Graded Aggregate or 3/4" Crushed Stone?
Is the use of crushed stone a better way to diminish the development of suction that leads to tensile-shrinkage failures?
Is the use of crushed stone a better way to diminish the development of suction that leads to tensile-shrinkage failures?





RE: Dense Graded Aggregate vs. Crushed Stone for Sidewalk Construction
use dense graded, crushed, compacted material not open graded.
use joints to control the location of cracks.
RE: Dense Graded Aggregate vs. Crushed Stone for Sidewalk Construction
Also suction is not what leads to shrinkage cracks. Autogenous shrinkage is not a function of suction but a result of chemical and physical volume change through hydration.
RE: Dense Graded Aggregate vs. Crushed Stone for Sidewalk Construction
The cost and performance differences are minimal. So blending may be done, but for a sidewalk either choices perform well.
Dick
Engineer and international traveler interested in construction techniques, problems and proper design.
RE: Dense Graded Aggregate vs. Crushed Stone for Sidewalk Construction
Crushed stone is sedimentary rock that has been crushed and graded by screens to certain size classes. Crushed stone may also be made from granite and other rocks.
Dense grade aggregate, or DGA, also known as crusher run, this is a mixed grade of mostly small crushed stone in a matrix of crushed stone powder, graded to produce low void content and maximum weight when compacted.
RE: Dense Graded Aggregate vs. Crushed Stone for Sidewalk Construction
Either one or both of your material sources might work, especially since this is just a sidewalk, you have not given enough information to make a selection.