216CELLULAR CONCRETE FILL, CCF

216.01Description

This work shall consist of furnishing and placing a lightweight, low absorbability cellular concrete fill in accordance with 105.03.

MATERIALS

216.02Materials

Materials shall be in acco rdance with the following: 10

Cement ........................................................................ 901.01(b) Fly Ash ........................................................................ 901.02 Foaming Agent ............................................................ 912.05 Water ........................................................................... 913.01

216.01

An admixture in accordance with 912.03 may be used as recommended by the CCF manufacturer.

A foaming agent shall produce CCF with the properties shown in 216.04. The 20 foaming agent shall be selected from those shown on the QPL of CCF Manufacturers/Installers.

CONSTRUCTION REQUIREMENTS

216.03Mix Design

A mix design prepared in accordance with the geotechnical report shall be submitted to the Engineer for approval at least five work days before the CCF operations begin. A cellular concrete manufacturer/installer shall be selected from those shown on the QPL of CCF Manufacturers/Installers. 30

216.04Properties and Tests

The CCF shall be in acco rdance with the manufacturer’s recommendations and the minimum physical properties as follows:

Properties Class II Class III Class IV Cast Density Mix 810 lb/cu yd 972 lb/cu yd 1,134 lb/cu yd Compressive Strength, ASTM C495*, min. 40 psi 80 psi 120 psi Freeze-thaw Resistance, at relative E = 70%, ASTM C666, modified, min. 80 cycles 300 cycles Water Absorption, max.** 20% 16% 14% Shear Modulus, G, ASTM D4015 25,000 psi 34,000 psi Young Modulus, E, ASTM D4015 67,000 psi 102,000 psi * Specimens shall not be oven dried for the compressive strength test. ** Percentage after 120 days. Long-term total immersion as a percent of cast density in accordance with ASTM C796.

The density shall be monitored at the point of placement at hourly intervals during placement. Adjustments shall be made as n ecessary to maintain the specified cast density, ±10%. If two consecutive test results are failing, operations shall cease and 40 corrective action taken before placement of the CCF resumes.

Foam density shall be tested twice during each 24 h period for each mixer. The foam density shall be within 10% of the target provided in the approved mix design.

216.05Storage and Handling

Protection of the material during and af ter placement shall be in accordance with the manufacturer’s recommendations. 216.05

216.06Weather Limitations

CCF shall be placed when the ambient temperature is 32°F or above. CCF shall not be placed on frozen subsoil. The installation procedure shall not begin if a temperature of less than 32°F is expected within a 10 h period from the completion of the CCF placement, unless recommended by the manufacturer.

216.07Preparation of Subgrade

The subgrade shall be prepared in accordance with 207. All standing water shall be removed prior to placement of CCF.

216.08Installation

CCF shall be proportioned, mixed, and placed in lifts as recommended by the manufacturer. Transit mixers will not be acceptable for mixing the CCF.

Three DCP tests for every 500 sq ft section will be performed. DCP testing will be in accordance with ITM 509. The CCF shall not be subjected to load or disturbed by construction activities until the average DCP blow count from three tests on a section is at least 10 per 12 in. depth.

The final surface finish shall be within ±0.1 ft of the plan elevation. 70

216.09Lots

Lots will be defined as 500 cu yds of CCF placed. A partial lot equal to or less than 60 cu yds shall be included in the previous lot. A partial lot greater than 60 cu yds but less than 500 cu yds will be considered a full lot.

216.10Testing

Acceptance of the work will be based on successful test results for compressive strength.

The Contractor shall cast four specimens for each lot. Testing of the specimens will be in accordance with ASTM C495, except test specimens shall be covered immediately after casting. The specimens shall be moist cured for 26 days and then air cured for two days prior to the compressive strength testing. The specimens shall not be oven dried. Test specimens will become the property of the Department after curing and will be tested at 28 days.

216.11Method of Measurement

CCF will be measured by the cubic yard for each class as computed from the neat lines shown on the plans. 90

216.12Basis of Payment

CCF will be paid for at the contract unit price per cubic yard of the class specified.

Payment will be made under: 216.06

Pay Item Pay Unit Symbol

Cellular Concrete Fill, _____ .................................................... CYS class 100

Water, curing, molds, equipment, materials, and other incide ntals necessary for finishing CCF specimens shall be included in the cost of CCF.

No payment will be made for replacement of damaged CCF.