ECONOCRET E BASE 318.04
318.01 Description
This work consists of the construction of an econocrete base.
318.02 Materials
Provide material in accordance with the following subsections: Material: Subsection: Aggregate 703.02 Portland Cement 701.02 Water 701.04 Air Entraining Agent 701.03 Fly Ash 702.01 Chemical Admixtures 701.03 Curing Agents 701.07
318.03 Equipment
Use equipment for producing and placing the econocrete base in accordance with Subsection 414.03, “Equipment.”
318.04 Construction Methods
Use the absolute volume method for a cubic yard [cubic meter] to design the econocrete base mix proportions. Identify the following in the design: The source of each material, The proportion of each material, The properties of the mixture, and The compressive str ength of the mix at 28 days. Submit the mix design to the Resident Engineer for approval at least 40 days before placing the econocrete base. Ensure the mix design meets the following criteria: The mix requires a cement content of at least 200 lb/yd³ [11 8 kg/m³]. The Contractor may substitute up to 25 percent of the cement content with fly ash at a ratio of 1 lb [1.0 kg] of fly ash per 1 lb [1.0 kg] of cement. Do not use fly ash from November 1 through April 1. The mix produces a maximum slump of 3 in [75 mm]. The mix produces an air content of from 4 to 12 percent.
318.06 Econocrete Base
198 The mix produces a compressive strength at 28 days of at least 1,200 psi [8,300 kPa]; determine the compressive strength by testing six cylinders in accordance with Subsection 701.01.D, "Tests and Samples." Construct the econocrete base in accordance with Subsection 414.04, “Construction Methods,” with the following exceptions: After strike off and consolidation, finis h to the elevation and cross section shown on the Plans, and create a smooth surface finish. Do not place longitudinal or transverse joints in the econocrete base except for butt joints used for construction joints. Apply a curing agent at a rate of at lea st 1 gal per 150 ft² [1 L per 3.75 m²] of econocrete base and allow it to cure for 7 days. A curing day is a period of 24 hr during which the ambient air temperature remains at least 40 °F [4 °C]. Begin the curing time count when the econocrete base cons truction is complete for the day and after the curing agent is applied. The Department will not allow construction traffic or the placement of overlying pavements on the econocrete base until the compressive strengths of test cylinders made during the base placement reach at least 500 psi [3,500 kPa]. Limit construction traffic on the base; do not use as a haul road. Repair damage to the base at no additional cost to the Department. Sweep the econocrete base from 12 hr to 48 hr before placing reinforcing steel for the overlying pavement and make a second application of curing agent at a rate of at least 1 gal per 100 ft² [1 L per 2.5 m²]. Do not allow traffic on the econocrete base after the second application of curing agent. Finish the econocrete base i n accordance with Subsection 301.04.A, “Tolerances.”
318.05 Method of Measuremen T
The Resident Engineer will measure the surface area of completed Econocrete Base placed at the thickness shown on the Plans.
318.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit: ECONOCRETE BASE Square Yard [Square Meter] OPEN -GRADED BASES 319.04 SECTION 319 OPEN -GRADED BASES
319.01 Description
This work consists of constructing a permeable base course, which includes the following: Mixing aggregate and bituminous material or aggregate, portland cement concrete, and water in a central plant, and Spreading and compacting the mixture on a prepared surface.
319.02 Materials
Provide materials in accordance with Section 708, “Plant Mix Bituminous Bases and Surfaces,” and the following subsections: Material: Subsection: Aggregate 703.03 Water 701.04 Fly Ash 702.01 Portland Cement 701.02
319.03 Equipment
Use equipment for producing, heating, mixing, hauling, spreading, compacting, and finishing the Open - Graded Bituminous Base (OGBB) in accordance with Subsection 411.03, “Equipment.” Use equipment for producing, mixing, hauling, spreading, compacting, and finishing the Open -Graded Portland Cement Concrete Base (OGPCCB) in accordance with Subsection 301.03, “Equipment,” and Subsection 414.03, “Equipment.”
319.04 Construction Methods
A.General
1.Prime Coat Apply a prime coat in accordance with Section 408, "Prime Coat." if required by the Contract.
2.Tolerances Finish open -graded bases in accordance with Subsection 301.04.A, “Tolerances. ”
3.Hydraulic Efficiency Construct and maintain a hydraulically efficient open -graded base. Perform a hydraulic efficiency test 24 hr before placing the overlying pavement. Do not place overlying pavement until achieving acceptable hydraulic efficiency, defined as 1 qt [1 L] of water absorbed into the base surface with no remaining standing water 15 sec after pouring. Remove and replace open -graded
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 211–212 of 935.