Questions and Answers Document 17 FEB 2022.pdf

The following questions and answers are provided for informational purposes only:

Question 1: Can you please let us know How many yards are in this project?

Answer: The contract is for the placement of concrete slabs per the dimensions specified in Figure 1 of the Performance Work Statement as well as quality control sampling and testing. It is up to the contractor to determine the cubic yards of concrete for the project.

Question 2: What is the timeframe for this project?

Answer: The anticipated timeframe for beginning construction is April/May 2022. The government engineer will work with the contractor to schedule construction. The required completion date is listed in the Performance Work Statement.

Question 3: Is “Existing HMA Section” Asphalt? And at what grade is it at in relation to proposed new work? Will it be in the way for setting forms on that side and need to be removed?

Answer: Yes, the “Existing HMA Section” is hot mix asphalt. A strip of the existing HMA and base course approximately 2 feet wide and full length of the test section will demolished by the Government to provide access for placing and removing the formwork on this free edge.

Question 4: Is the edge of the existing 14” PCC section new concrete being installed against straight; or are there any low / high spots along that edge? If edge is not good, is contractor to make the new concrete straight, or match existing on that side?

Answer: The existing 14” PCC section is straight, and the contractor is expected to match the existing edge on that side. The Government will saw cut this edge full depth during demolition to provide a vertical edge.

Question 5: Has the government any previous experience using brine/saltwater mix on any other similar portland cement projects at ERDC?

Answer: Yes, ERDC recently successfully completed a 12 cy placement with Delta Industries using saltwater concrete. No significant issues were observed during placement. Workability was within acceptable tolerances.

Question 6: Does govt. know if called for curing agent has any adverse reaction due to high salinity?

Answer: The government did not observe any adverse reaction with the curing compound on the test slab using saltwater. The government will accept risk of any adverse reaction from the curing compound.

Question 7: Will there be any special requirements on site for washing out chutes, etc. since saltwater mix?

Answer: There will be a washout area on-site for the trucks and there will not be any special requirements on site. A cleanout fee to be paid to the batch plant to remove residual saltwater from the mix trucks, is not expected to exceed $5/cy of concrete. However, the offering contractor should coordinate directly with Delta Industries for their cleanout fees that should be included in the overall contract price.

Question 8: Please clarify any requirements if any in regards to Covid? Masks, etc??

Answer: Currently, there are no requirements for masks when working outdoors. Requirements in the future are unknown but will follow Federal Government and Department of Defense guidance.