Atch2a_Addm1_20180208.pdf

ADDENDUM NO. 1

TO

RFP NO. FA520518R0003

ROADS/PAVEMENTS & MISC. CIVIL WORK IDIQ CONTRACT,

MISAWA AB, JAPAN

8 Feb 18

Contract specifications, drawings and GCEB are modified to provide the following changes:

A. Specification Section 01 11 00

1. Para. 1.1.1.1 GENERAL. Change word from basic year to basic period, date 8 Feb 18.

2. Para. 1.1.1.3 GENERAL CONSTRUCTION AND OTHER WORK. Change concrete formulation from 27-8-25 to 24-8-25 for ELIN A014/B014/C014/D014/E014 as revised specification 32 16 13 CONCRETE SIDEWALKS, CURBS AND GUTTERS, date 8 Feb 18.

B. Specification Section 32 16 13

1. Para. 2.1 CONCRETE. Change sentence from “Concrete shall conform to the applicable requirements of Section 03 31 01.00 10, CAST-IN-PLACE CONCRETE (MINOR CONSTRUCTION) except as otherwise specified.

Concrete for curb and gutters shall have a minimum flexural strength of 45 kg per square cm at 28 days and maximum size of aggregate shall be 19 mm. Concrete for sidewalk shall have a minimum compressive strength of 240 kg per square cm and maximum size of aggregate shall be 19 mm. Concrete for all other work shall have a minimum compressive strength of 240 kg per square cm and maximum size of aggregate shall be 19 mm. Precast concrete curb units shall consist of straight, curved, and or tapered sections of various dimensions. Concrete used in precast concrete curbs shall be in accordance with JIS A 5307 except that Air Entrainment shall be as specified below” to “Concrete must have a minimum compressive strength of 24 MPa (3500 psi) at 28 days. Size of aggregate must not exceed 37.5 mm (1-1/2 inches). Submit copies of certified delivery tickets for all concrete used in the construction. Precast concrete curb units shall consist of straight, curved, and or tapered sections of various dimensions. Concrete used in precast concrete curbs shall be in accordance with JIS A 5307 except that Air Entrainment shall be as specified below.”

C. Specification Section 03 31 01.00 10

1. Delete specification section 03 31 01.00 10 CAST-IN-PLACE STRUCTURAL

CONCRETE FOR CIVIL WORK.

D. Specification Section 33 40 00

1. Para. 2.2.1 CONCRETE. Change sentence from “Unless otherwise specified, concrete and reinforced concrete shall conform to the requirements for 27.5 MPa concrete under Section 03 31 01.00 10 CAST-IN-PLACE STRUCTURAL CONCRETE FOR CIVIL WORK. The concrete mixture shall have air content by volume of concrete, based on measurements made immediately after discharge from the mixer, of 5 to 7 percent when maximum size of coarse aggregate exceeds

37.5 mm. Air content shall be determined in accordance with ASTM C 231. The concrete covering over steel reinforcing shall not be less than 25 mm thick for covers and not less than 40 mm thick for walls and flooring. Concrete covering deposited directly against the ground shall have a thickness of at least 75 mm between steel and ground. Expansion-joint filler material shall conform to ASTM D 1751, or ASTM D 1752, or shall be resin-impregnated fiberboard conforming to the physical requirements of ASTM D 1752 “ to “Unless otherwise specified, concrete and reinforced concrete shall conform to the requirements for 24 MPa concrete. The concrete mixture shall have air content by volume of concrete, based on measurements made immediately after discharge from the mixer, of 5 to 7 percent when maximum size of coarse aggregate exceeds 37.5 mm. Air content shall be determined in accordance with ASTM C 231. The concrete covering over steel reinforcing shall not be less than 25 mm thick for covers and not less than 40 mm thick for walls and flooring. Concrete covering deposited directly against the ground shall have a thickness of at least 75 mm between steel and ground.

Expansion-joint filler material shall conform to ASTM D 1751, or ASTM D 1752, or shall be resin-impregnated fiberboard conforming to the physical requirements of ASTM D 1752”.

Per the changes above, the specification cover, table of contents, Section 01 11 00, 03 31 01.00 10 and 33 40 00 are replaced with revised 8 Feb 18 attached to this addendum.

E. Drawing No. T-1 thru G-1

1. Add a description of drawing “CONCRETE PAVEMENT DETAIL” in the drawing reference No. A-2.

2. Add a concrete formulation “24-8-25” to concrete sidewalk in the drawing reference No. B-1, CONCRETE SIDEWALK DETAIL.

3. Change a concrete formulation from “27-8-25” to “24-8-25 for concrete sidewalk in the drawing reference No. B-2, CONCRETE CURBS DETAIL and B-3, CONCRETE CURBS & GUTTER DETAIL.

4. Change a sheet number of drawing No. T-1 thru G-1.

Per the changes above, the Drawing No. T-1 thru G-1 are replaced with revised 8 Feb 18 attached to this addendum.

F. Schedule of Material Submittals

1. Delete line number 6 in Schedule of Material Submittals.

Per the changes above, the Schedule of Material Submittals is replaced with revised 8 Feb 18 attached to this addendum.

(End of Addendum)

3 Attachments:

1. Specifications, Revised 8 Feb 18.

2. Drawing No. T-1 thru G-1, Revised 8 Feb 18.

3. Schedule of Material Submittals, Revised 8 Feb 18.