710.01 DESCRIPTION. Furnish, place, and consolidate a controlled
low strength flowable fill as an alternative to compacted soil. Applications for this material include, but are not limited to, general backfilling of drainage structures, entrenchments across pavements, encasements, beddings, void filling, and other uses as shown on the plans or as approved by the engineer. The flowable fill shall be a cementitious mixture of portland cement, fly ash (depending on application and mix design), fine aggregate, water, entrained air, and appropriate admixtures for the particular application.
710.02 MATERIALS. Materials shall comply with the following
sections and subsections: Portland Cement 1001.01 Fine Aggregate 1003.08.1 Admixtures 1011.02 Water 1018.01 Fly Ash 1001.04 Design and proportion flowable fill in accordance with Table 710-1. Trial batching will be required for excavatable and non-excavatable mixes to ensure appropriate job mix consistency and adherence to Table 710-1 properties. Use excavatable fill unless noted otherwise on the plans. Table 710-1 Flowable Fill Mix Design 1 Material Excavatable Non-Excavatable Portland Cement 75 - 100 lb/cu yd 75 - 150 lb/cu yd Fly Ash 0 - 150 lb/cu yd 150 - 600 lb/cu yd Water 2 — — Air 3 10 - 35% 5 - 20% Concrete Sand Proportioned to yield 1 cu yd Proportioned to yield 1 cu yd Unit Weight (wet) 3 90 - 110 lb/cu ft 100 - 125 lb/cu ft 28-Day Compressive Strength 3 Maximum 100 psi Minimum 125 psi 1 Mix designs shall yield 1.0 cubic yard absolute volume. 2 Mix designs shall produce a consistency that will result in a flowable self-leveling product at the time of placement and conform to the requirements of 710.02. 3 The requirements for percent air, compressive strength and unit weight are for laboratory designs only and are not intended for jobsite acceptance requirements unless otherwise directed by the project engineer. For early opening to traffic and expedited placement circumstances, the maximum or minimum required strength shall be attained in the desired time frame.
710.03 CONSTRUCTION REQUIREMENTS. Before placement,
provide temporary end dams or soil berms as directed by the engineer to confine the flowable fill. Place flowable fill to the lines and grades shown on the plans or as directed. Where flotation or misalignment may occur due to hydrostatic pressure, assure correct alignment and placement of the encased structure by using straps, soil anchors, or other approved means of restraint. Protect flowable fill from freezing for 36 hours after placement. Place flowable fill by chute, pumping or other methods approved by the engineer. Due to flowable fill’s liquid condition, take into account the hydrostatic pressure on adjacent structures on deep fills where multiple lifts may be required. While in a liquid state, flowable fill in deep excavations is in a quick condition, and shall be protected until hardening occurs. For early opening to traffic and expedited placement circumstances, perform trial batches to verify compressive strength for the required time frame before placing under load. Flowable fill will not require field sampling or testing other than the approved trial batch mix design, unless otherwise directed by the project engineer.
710.04 MEASUREMENT. Flowable fill will be measured by the cubic
yard by batch tickets as adjusted by the project engineer.
710.05 PAYMENT. Payment for flowable fill will be made at the
contract unit price per cubic yard. Payment will be made under: Item No. Pay Item Pay Unit 710-01 Flowable Fill Cubic Yard
Flowable Fill in other states
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