TranSystems Corporation - LGM Construction

501070099 Federal Express Oakland Sort Expansion Issued for Bid 10/11
SECTION 02239 - CEMENT MODIFICATION OF SOILS
PART 1 - GENERAL
1.1 Compliance with Caltrans Standard Specifications: All materials and procedures shall comply with the
latest edition of the Caltrans Standard Specifications for Cement Treated Bases.
1.2 Cement Factor: Owner will procure services to conduct laboratory testing prior to construction to verify
properties for cement stabilization and to allow optimization of the amount of cement used to treat soil.
The percentage of cement is expected to be between 4% and 8%. The exact cement content shall be that
at which the mix develops a 7-day compressive strength of at least 650 psi.
1.3 Testing/Test Reports: Testing and test method will be as outlined in ASTM D 2922 and ASTM D 3017.
1.4 Plant, Equipment, Machines and Tools: Plant, equipment, machines and tools used in the work shall be
subject to approval by Owner and shall be maintained in a satisfactory working condition at all times. The
equipment shall be adequate and shall have the capability of producing the required compaction, meeting
grade controls, thickness control and smoothness requirements as set forth herein.
A. The machinery, tools and equipment necessary for proper execution of the work shall be on the project
and approved by the Geotechnical Engineer prior to the beginning of the construction operation and shall
be maintained in good working order.
B. Cement shall be stored and handled in closed weatherproof containers until immediately before
distribution on the sub grade.
C. Cement furnished in trucks shall have the net weight of the cement certified.
D. Slurry trucks may or may not have re-circulation system, and be equipped with dispersion plates or
suitable means for distribution.
E. Spreader bars for distributing dry cement shall be as close to the ground as practical, but in no case shall
they be greater than 18 inches above the ground. Spreader bars shall be clean and in good working order
so as to produce a consistent and even distribution of cement of the sub grade.
1.5 Weather Limitations: Cement shall not be applied when the atmospheric temperature is less than 40
degrees F or in windy conditions. No cement shall be applied to soils that are frozen or contain frost. If the
temperature falls below 35 degrees F, completed cement-treated areas shall be protected against
detrimental effects of freezing. Any areas of completed cement modified soil that are damaged by
freezing, rainfall, or other weather conditions shall be brought to a satisfactory condition in conformance
with this specification without additional cost to the Owner.
1.6 Submittal: Submit Laboratory test data and proposed plan, mix, process and equipment for cement
stabilization to Geotechnical Engineer and to Owner prior to construction.
PART 2 - PRODUCTS
CEMENT MODIFICATION OF SOILS 02239-1