![]() ![]() Get an average of the width and depth because each measurement won’t be the same along various points of the project. Then measure the width and depth/height at several points along the trench or space you need to fill. Retaining wall backfill : It supports retaining walls to hold back the earth and dirt behind them to add strength to a project.Ĭalculate flowable fill as you would for filling a trench or space with concrete.It offers a better alternative than granular fill or full-strength concrete for bridge construction if the weight parameters call for it. Bridge abutment : Flowable fill supports the transition from a bridge’s superstructure to ground fill.Paving subbase : Because flowable fill self-levels, road crews can pour it over the granular road base when constructing new roads.Utility trenches : Pour flowable fill as backfill or bedding for concrete drainage pipes or culverts.However, excavators and crews should protect flowable fill from subfreezing temperatures until it fully hardens.Ĭonsider using a flowable fill calculator for these types of projects: Unlike concrete, flowable fill does not require curing or a particular set time. What Is Flowable Fill Used For?Įxcavators typically use flowable fill as backfill to fill gaps or trenches. Because these materials are generally lower in quality, construction companies should never consider using flowable fill as concrete. Standard applications of CLSM have a compressive strength of less than 300 psi, making concrete volume calculations easier to manage.įlowable fill is usually made of water, cement, fine aggregate (sand), and fly ash or slag. As the name implies, crews can distribute flowable fill in a similar fashion to concrete using ready-mix trucks.Īlso called controlled low strength material (CLSM), the compressive strength of flowable fill usually measures less than 1200 psi. What Is Flowable Fill?įlowable fill represents an economical alternative to granular fill that is similar to concrete but has less compressive strength. Flow fill calculations can assist with pre-construction. With the cost of materials rising, you’ll need bids for projects to remain competitive with as much cost savings as possible. Utilizing flowable fill on a concrete pipe project reduces labor and machinery you would need to tamp and compact traditional granular fill. In fact, flowable fill techniques can save your excavating crews time on a project when used properly. Knowing how to calculate flowable fill is helpful during the planning phase of a job. ![]()
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