Page 251 - Villas at Savona Close-out Manual

bentonite), organic matter, or similar materials shall not be used.

B. Cement
Cement shall be Type I or Type II as per the requirements of ASTM C150. Other types of cement
may be used subject to the engineer’s approval.
The cement can be delivered to the job site in bags or by bulk delivery. Bulk-delivered cement
shall be stored in appropriate silos or other containers specially designed for cement storage.
Cement storage facilities shall be subject to the engineer’s approval.

C. Aggregates
The grout aggregate shall consist of naturally occur- ring, round-grained materials conforming to
the grain size distribution shown in the envelope on Plate 1.
The inclusion of clay-size particles in the aggregate shall be limited to 5% by mass (see Plate 1).
The portion of the aggregate passing a No. 40 sieve shall not possess a plasticity index (PI) greater
than 15 when tested in accordance with ASTM D4318.

D. Water
Water shall be free of excessive amounts of salts and other impurities that adversely affect the set
or hydration of the cement in the grout mixture, as specified by ASTM C1602 Standard
Specification for Mixing Water Used in the Production of Hydraulic Cement Concrete.

2.2 FOAM GROUT

Furnish a closed cell, hydro-insensitive, high density polyurethane system, such as URETEK 486
STAR or equivalent, with:
a minimum free rise density of 3.0 lbs./cubic ft. with a minimum compressive strength of 38.0
psi,
a maximum free rise density of 3.2 lbs./cubic ft.,
a water insoluble diluent, which permits the formation of polyurethanes in excess water and
provides polyurethane foam with improved dimensional stability properties. This formula and
these characteristics must be certified by the manufacturer.

3. DRILLING AND GROUTING EQUIPMENT

3.1 GENERAL

A. Drilling equipment shall be capable of advancing the grout holes to the required depth through the
existing soil and rock materials, as well as any natural or man- made obstructions. The term
drilling herein used shall include driving methods for casing placement. Either rotary or rotary
percussive drilling equipment can be used. Circulation flush shall be accomplished with water or
air-water foam. The use of other drilling fluids or mud shall be subject to the engineer’s approval.

B. Cone Penetrometer. Provide a portable dynamic cone penetrometer for on-site soils investigation
to assist in the location of weak sub-base soils and to determine the injection pattern through tubes
to densify the weak soils.

3
HEERUP ENGINEERING, PC January 16
Villas at Savona 03229