Rev. 10-9-96

LIGHTWEIGHT ENGINEERED FILL

215-R-189

The Standard Specifications are revised as follows:

SECTION 215, BEGIN LINE 1, INSERT AS FOLLOWS:

SECTION 215CLIGHTWEIGHT ENGINEERED FILL

 

215.01 Description. This work shall consist of furnishing and placing lightweight embankment materials in accordance with 105.03.

215.02 Materials. Materials shall consist of B borrow, geogrid, and lightweight engineered fill.

Materials shall be in accordance with the following:

B Borrow .............................................................211.02

Coarse Aggregate No...........................................53 904.02

Geogrid................................................................ 617

Lightweight Engineered Fill ...............................913.22

 

215.03 Construction Requirements. In areas where the lightweight engineered fill is to be used, the existing roadway and embankment shall be excavated to the limits shown on the plans and proofrolled in accordance with 203.26.

All soft soils shall be removed up to an additional 0.3 m (1 ft). The excavation shall be backfilled with B borrow to within 150 mm (6 in.) of the final subgrade and initial ground line elevation. Such B borrow shall then be compacted. The geogrid shall be installed. A layer of B borrow of 150 mm (6 in.) minimum thickness shall be placed and compacted on the widened areas. Compacted aggregate base size No. 53B shall be placed in areas to be paved.

B borrow placement shall be in accordance with 211.

Class III and Class IV engineered fill construction shall be in accordance with the manufacturer's recommendations.

Guardrail posts shall not be driven through the lightweight engineered fill. Holes for guardrail posts shall be cored into the fill and backfilled with bituminous base 5D prior to driving the guardrail posts.

215.04 Method of Measurement. B borrow will be measured in accordance with 211.09. Geogrid will be measured in accordance with 617.06. Lightweight engineered fill will be measured by the cubic meter (cubic yard) for the specified class, complete in place.

215.05 Basis of Payment. The accepted quantities of B borrow will be paid for in accordance with 211.10. The accepted quantities of geogrid will be paid for in accordance with 617.07. The accepted quantities of lightweight engineered fill will be paid for at the contract unit price per cubic meter (cubic yard) for lightweight engineered fill, for the specified class, complete in place.

 

Payment will be made under:

 

 

Pay Item

Pay Unit

B Borrow................................................ ................................m3 (CYS)
Geogrid.................................................. .................................m2 (SYS)
Lightweight Engineered Fill, ______.... .................................m3 (CYS)

class

 

The costs of guardrail post treatment, and furnishing of molds, facilities, or materials necessary to cure specimens shall be included in the costs of the pay items.

SECTION 913, AFTER LINE 4671, INSERT AS FOLLOWS:

913.21 Blank.

913.22 Lightweight Engineered Fill. Lightweight engineered fill shall be in accordance with the manufacturer's recommendations and the minimum physical properties as follows:

  CLASS III CLASS IV
Maximum cast density 577 kg/m3 673 kg/m3
  (36 pcf) (42 pcf)
Minimum compressive 552 MPa 827 MPa
strength (80 psi) (120 psi)
     
Freeze-thaw resistance    
Minimum cycles at    
relative E = 70% per    
ASTM C 666, modified 60 cycles 330 cycles
     
Water Absorption    
Long term immersion as    
percentage of cast    
density of 120 days    
per ASTM C 796 10 - 16% 8 - 14%
     
At confining pressure of    
3 psi (20.7 MPa)    
per ASTM D 4015    
Shear modulus, G 234 000 MPa N/A
  (34,000 psi) (N/A)
     
Young's modulus, E 772 000 MPa N/A
  (112,000 psi) (N/A)
     
Coefficient of permeability    
per ASTM D 2434    
at 17.2 MPa (2.5 psi) 0.01 µm/s 0.0031 µm/s
24 MPa (18 psi) 1 2.3 µm/s 0.044 µm/s

 

 

(a) Sampling and Testing. A Type B certification in accordance with 916 will be required for initial acceptance.

 

1. Wet Density.

a. During placement of the initial batches, the density shall be checked and adjustments made to the mix as required to obtain the specified cast density at the point of placement.

b. At hourly intervals during placing, the density shall be monitored and adjustments made as necessary to maintain the specified cast density.

2. Strength.

a. Four test specimens shall be made for each 230 m3 (300 cu yd) of engineered fill placed, or one specimen shall be made from each four hours of placing.

b. Test in accordance with ASTM C 495, except:

(1) To prevent damage and loss of moisture, cover and protect specimens immmediately after casting;

(2) Moist cure the specimens for seven days; then air dry for 20 days;

(3) Do not oven dry specimens that are to be load tested.

(4) Test specimens shall be tested at an age of 28 days for density and compressive strength.

c. Failure to meet the strength requirements will be cause for rejection of the quantity of concrete represented by the cylinders.

d. The specimens shall be 75 mm x 150 mm (3 in. x 6 in.) cylinders, unless otherwise directed.

4. Test Specimens. Test specimens shall be tested for absorbtion at 28 days after casting.