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
B Borrow .............................................................211.02
Coarse Aggregate No...........................................53 904.02
Geogrid................................................................ 617
Lightweight Engineered Fill ...............................913.22
Pay Item Pay Unit
B Borrow................................................ ................................m3 (CYS) Geogrid.................................................. .................................m2 (SYS) Lightweight Engineered Fill, ______.... .................................m3 (CYS) class
SECTION 913, AFTER LINE 4671, INSERT 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.