Caltrans Office Engineer

Viewing inquiries for 08-0P8604

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Inquiry #1: Page 62- Table “Minimum Quality Control Requirements for HMA Mix” and Page 67-“HMA Mix Acceptance”

Question- The Asphalt binder content (%) for RHMA-G is shown as JMF+/-0.40. The latest RSS feed from Caltrans (dated 01-02-13) has changed this requirement to JMF -0.4 and +0.5. What are the requirements for this project?

Inquiry submitted 02/14/2013

Response #1:Submitted for consideration.
Response posted 02/19/2013


Response #2:Please bid as per current plans and specifications.
Response posted 02/20/2013




Inquiry #2: Page 80-3rd paragraph item 4

Question-The specification requirement under item” 4.2 Voids filled with asphalt (design value +/- 1.0 percent)” and item “4.3 Dust proportion (design value +/- 0.5)” during job mix formula verification does not align with the specification requirement of “Report Only” listed under Table “Hot Mix Asphalt Mix Design Requirements” on Page 77 and under Table “Minimum Quality Control Requirements for HMA Mix” on Page 62 and under table “HMA Mix Acceptance” on Page 67. Please advise.

Inquiry submitted 02/14/2013

Response #1:Submitted for consideration.
Response posted 02/19/2013


Response #2:The values for RHMA VFA and Dust proportion per the "Hot Mix Asphalt Mix Deign Requirements" are "Report Only" as such the requirement for design value+/- tolerance does not apply.
Response posted 02/20/2013




Inquiry #3: Page 80- 3rd paragraph item 4

Question-The latest RSS feed from Caltrans (dated 01-02-13) has a tolerance on VMA during job mix formula verification- VMA (minimum HMA mix design requirement +3.0 -1.0)? Please advise.

Inquiry submitted 02/14/2013

Response #1:Submitted for consideration.
Response posted 02/19/2013


Response #2:Please bid as per current plans and specifications.
Response posted 02/20/2013




Inquiry #4: Page 80- last paragraph “HMA plant asphalt set point for HMA production must be the optimum binder content specified on your CEM-3512SP…..”

Question- From the latest e-mail correspondence from Caltrans (Sacramento) - “During production Contractor will be allowed to adjust binder setpoint at plant to control binder target value”? Please advise.

Inquiry submitted 02/14/2013

Response #1:Submitted for consideration.
Response posted 02/19/2013


Response #2:Please bid as per current plans and specifications.
Response posted 02/20/2013




Inquiry #5: Page 63- Table “Minimum Quality Control for In-Place HMA” , Page 68-Table”HMA Acceptance In Place”, and Page 77-Table “Hot Mix Asphalt Mix Deign Requirements”

Question- The footnotes for Hamburg Wheel test indicate that the RHMA test specimens may be held at a constant height for a maximum of 90 minutes. Does this imply that the compacted RHMA specimens stay in the gyratory mold after compaction for a maximum of 90 minutes?

Inquiry submitted 02/14/2013

Response #1:Submitted for consideration.
Response posted 02/19/2013


Response #2:The specification allows the specimen to stay in the mold with the gyratory compactor maintaining a constant height for a maximum of 90 minutes. The time the specimen stays in the mold (0 to 90 minutes) is at the discretion of the contractor.

Please bid per plans and specifications.
Response posted 02/20/2013




Inquiry #6: If the intent is to grind and overlay the existing shoulders to ultimate width (8'-10' inside and 13' outside) as depicted in the drawings, how can the contractor perform this work when the inside shoulders appear to be between 2'-4' wide and the outside shoulders are approximately 10' in width? This discrepancy also causes the grinding and asphalt quantities to be overstated. Please clarify.
Inquiry submitted 02/19/2013

Response #1:Submitted for consideration.
Response posted 02/20/2013


Response #2:Grind and overlay the entire existing inside and outside AC shoulders, which vary in width.
Response posted 02/20/2013




Inquiry #7: Per sheet 3 of the project plans, it shows that the full depth asphalt remove and replace section does not go up to the final pavement surface. Is the State going to allow the contractor to leave the final pavement surface down .1' until the ARHM is placed. If not, how is the HMA going to be paid that is going to be placed and eventually removed prior to final cap paving?
Inquiry submitted 02/20/2013

Response #1:Submitted for consideration.
Response posted 02/20/2013


Response #2:No drop off allowed. Replace Asphalt Concrete Surface should place HMA back to existing surface level then follows with 0.1' cold plane and RHMA overlay. Work items and quantities will be measured and paid accordingly.
Response posted 02/20/2013




Inquiry #8: Page 95 “Asphalt Rubber Binder Content” Item 8.

Question- Is the 7.5 percent referenced in Item 8 indicate 7.5 percent based on dry weight of aggregate or 7.5 percent based on total weight of mix?

Inquiry submitted 02/20/2013

Response #1:Submit for consideration.
Response posted 02/21/2013


Response #2:The 7.5 is by total weight of mix
Response posted 02/21/2013






The information provided in the responses to bidder inquiries is not a waiver of Section 2-1.03, “Examination of Plans, Specifications, Contract, and Site of Work,” of the Standard Specifications or any other provision of the contract, nor to excuse the contractor from full compliance with the contract. Bidders are cautioned that subsequent responses or contract addenda may change a previous response.