Attachment R - Foundation Inspection.pdf
PDF 136 KB Posted
- Attached to
- New Germany Communications Tower
- Solicitation number
- BPM054089
- Issued by
- Harford County, Maryland
About this file
This is a Scope of Work attachment for foundation inspection requirements issued by the Maryland Department of Information Technology (DoIT) for communications tower construction projects under the FA13 master contractor program. The document establishes mandatory testing and inspection protocols that tower construction vendors must follow to ensure proper concrete quality, foundation strength, and installation integrity for all CATS+ FA13 jobs, with results requiring DoIT review and approval before any structures are erected or backfilling operations commence. Field testing must be conducted by independent third-party inspectors, and all test results must be supplied as part of closeout documentation. Vendors are required to use MD SHA-approved concrete mixes and follow MD SHA Standard Specifications for Construction and Materials (July 2024).
The scope mandates nine specific inspection and testing protocols, including verification of excavation dimensions, compaction testing per AASHTO T99, bearing pressure testing, rebar verification, ambient temperature recording, concrete slump testing per AASHTO T119 for each continuously poured caisson or every 50 cubic yards, concrete temperature measurement per AASHTO T309, air entrainment testing per AASHTO T152 or T196, and compressive strength testing at 7 and 28 days per AASHTO T23. Tower foundation compressive strength must meet a minimum of 4000 psi at 28 days or the foundation designer's specification, whichever is greater, with at least one set of four cylinders required per continuously poured section or every 50 cubic yards. Shelter foundations require a minimum of 3000 psi at 28 days or designer requirements, whichever is greater, with one set of four cylinders for each shelter foundation. Test cylinders must be cured on-site with weather protection as needed, and inspectors have authority to halt work if specifications are not met.
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ATTACHMENT R – FOUNDATION INSPECTION SCOPE OF WORK
SUMMARY: Tower construction vendors shall incorporate the following series of tests and inspections to ensure proper quality/strength of all concrete poured and the proper foundation installation on all
CATS+ FA13 jobs. These inspections shall also incorporate verification of foundation dimensions, rebar dimensions, rebar layout and soil compaction. Test results shall be supplied, reviewed and approved by
DoIT prior to any structures being set on foundations, tower erection or backfilling operations. Field testing shall be conducted by an independent, third party.
DETAILS: Each concrete batch (6-9 cubic yards) shall have a corresponding batch report provided by the supplier. These shall be included in the closeout documentation. Batches shall be uniquely identified on the batch report. The vendor shall use MD SHA approved concrete mixes for all FA13 projects. Mix tables and more information on concrete specifications can be found in section 900 in the MD SHA MD
SHA Standard Specifications for Construction and Materials July 2024.
The following mandatory tests/inspections shall take place for the tower and shelter foundations:
1. Construction inspectors shall verify the excavated foundation dimensions are correct.
2. The compaction of the tower foundation excavated materials shall be tested in accordance with
AASHTO T99 (Standard Proctor Test). Compaction results shall be in accordance with the tower foundation designer’s specification or the geotechnical report provided, whichever is greater. Excavated fill will only be used to backfill the foundation if they pass the compaction test.
3. The bearing pressure of the tower foundation sub grade shall be tested. Bearing results shall be in accordance with the tower foundation designer’s specifications or the geotechnical report provided, whichever is greater. In the event the vendor cannot meet the required bearing pressure, it shall solicit advice from the tower manufacturer and geotechnical engineer to achieve the desired results.
4. Construction inspectors shall verify the proper rebar size, dimension, grade, configuration, layout, fastener/wire ties and other provisions as specified by the foundation designer are correct prior to any concrete pours.
5. Ambient air temperature and general weather conditions shall be recorded and noted by the inspector. Readings shall be taken at the time of delivery.
6. Concrete slump shall be tested for each continuously poured section of caisson or every fifty (50) cubic yards of concrete on a pad and pier foundation. The slump shall be tested in accordance with
ASSHTO T119 testing standard. The slump shall meet the tower foundation designer’s specification. If none are noted, then the Slump will be measured in accordance with SHA MD
SHA Standard Specifications for Construction and Materials July 2024 Section 900. Results shall be recorded and supplied prior to acceptance of the given foundation. Work may be halted if the slump is not deemed acceptable.
7. Concrete temperature shall be measured for each continuously poured section of a caisson or every fifty (50) cubic yards of concrete on a pad and pier foundation. Temperatures shall be tested in accordance with ASSHTO T309 testing standard. Temperature shall be in accordance with the foundation designer’s specification. If no specifications are supplied, then the temperature will be measured in accordance with SHA MD SHA Standard Specifications for Construction and Materials July 2024 Section 900. Results shall be recorded and supplied prior to acceptance of the given foundation.
8. Air entrainment shall be tested and documented in accordance with ASSHTO T152 or T196.
The results shall be documented for each continuously poured caisson or 50 cubic yards for a pad and pier foundation. Air content shall be within the foundation designer’s specification or no more than 5-8%.
9. Compressive strength shall be measured at 7 days after pour and 28 days after pour. Compressive strength tests shall be tested in accordance with ASSHTO T23 testing standard. A minimum of one (1) set of four (4) cylinders shall be taken for each continuously poured section of caisson or every fifty (50) cubic yards of concrete on a pad and pier foundation. Compressive strength shall be a minimum of the tower foundation’s specification or 4000 psi at 28 days, whichever is greater.
At least one cylinder per set shall be broken at 7 days and one at 28 days. If all 7-day sets have reached the required compressive strength, then back fill operations and/or tower erection can commence. 14-day tests can be conducted if the 7-day tests are not within specification to expedite construction. 28-day tests shall be conducted even if 7-day tests are deemed acceptable. Written results shall be provided to the State Project Manager prior to tower erection. Shelter foundations shall be at least 3000 psi or the shelter foundation designer’s requirements, whichever is greater, at 28 days. Shelter foundations shall require one (1) set of four (4) cylinders for both shelter foundations. Test cylinders shall be cured on site. As weather conditions dictate, the vendor shall provide a cure box to adequately insulate the test cylinders as they cure.
The inspector shall provide photographs if necessary. If specifications are not met, then the inspector has the authority to stop work until specifications are met.
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