Q A_SAND_CREEK.pdf

DTFH6815B00011 10/26/15

WY FLAP 129(1), Sand Creek Road

10/19/15 Question #1

I have a question in regards to the CMU masonry blocks. In the final geotechnical report, it calls for “CMU blocks are readily available as hollow or solid core, flat or cut face units with the following standard dimensions.” My question is how many solid core CMU blocks are needed vs. hollow core? In the paylist items, only 750 sq yd is given for CMU blocks, however in the bid invitation and pay list items, it does not break down the amount of square feet for each hollow and solid core. When watching the GRS-IBS video, it shows layers of solid core at the base, followed by layers of hollow core bricks. I would like to know the percent or the amount of solid core blocks needed for the project.

Response: For the location of each type of block (solid core, hollow core and reinforced concrete filled block) refer to the “Block Type Key” on the Abutment Elevations & Sections sheets for each bridge.

Sheets S7-S9, bridge #1 Sheets S23-S24, bridge #2 Sheets S69-70, bridge #5 Sheets S85-87, bridge #6

The summary of quantities, schedule A, sheet B2, shows the estimated SY of Concrete Masonry Units (CMU) estimated for each bridge location.

The determination of the percentage or amount of each type of block is the contractor’s responsibility.

10/22/15 Question #2

“What is the material requirement for the rail hardware? The plans indicate ASTM A325 but my experience with this type of rail is a different requirement – an AASHTO F1554 Type 105. Is this what is required here?”

Response: The ASTM A325 material requirements for the rail hardware as shown in the IFB are correct. Bid as shown.

Question #3

“The precast concrete supplier be allowed to cast these with a self-consolidating concrete mix?”

Response: The use of a self-consolidating concrete mix is acceptable.

Question #4

“Is there a requirement for the void material? Gage is planning to cast in foam and of course, leave this foam in place in the final product.”

Response: The use of stay in place foam is acceptable. There is no requirement for the void material, there is a “performance” requirement. See FP-03, Subsection 562.03 Design. Design and construct safe and adequate temporary works that will support all loads imposed and provide the necessary rigidity to produce in the final structure, the lines and grades shown on the plans.