4.5. SR 11-16-2020 - Laserfiche WebLink

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PROJECT TASKS The scope of special testing and inspection services for the project (Cost Proposal) will consist of: SOIL TESTING: Four (4) soil samples are to be collected and returned to our soil laboratory for a standard laboratory proctor test (ASTM D698) to determine maximum dry density. One (1) grain size analysis test (Gradation) (ASTM C136) is to be conducted in accordance with the American Society of Testing and Materials' procedures. Our engineering technicians will be on -site to conduct observations of the excavation bottom to verify complete removal of unsuitable material to reach suitable material and that excavations are kept from freezing. Periodic observation of the backfill process and nuclear density tests (ASTM D6938) will be conducted to verify that all subgrade and backfill material used consists of suitable soils and is properly placed and compacted. A total of fifty- six (56) nuclear density tests are planned for the building and parking lot areas. CONCRETE TESTING AND INSPECTIONS: A representative from our agency will attend the pre - installation meeting for the cast -in -place concrete. The building related quality control services consisting of determining air content, temperature, and slump of the concrete placed on -site will be conducted on twenty (20) occasions (at a rate of one per 25 cubic yards and every 50 cubic yards thereafter). In addition, at the time of the on -site concrete tests, four (4) specimens of the concrete will be cast on -site, field cured for 24 hours, and then returned to our lab for standard curing and compression (two (2) at 7 days and two (2) at 28 days) with an additional four (4) specimens to be field cured and tested for compression (two (2) at 7 days and two (2) at 28 days) in our concrete lab. The specimens will then be compressed as required to determine that the strength of the in -place material is within MN/DOT and the American Concrete Institute standards and project specifications. Continuous inspection of the concrete formwork and steel reinforcement (rebar) will be conducted to verify that it is in accordance with the construction documents. Placement of the concrete will be conducted. Verification that proper cold and hot weather practices are followed will also be provided. MASONRY TESTING AND INSPECTIONS: A representative from our agency will attend the pre - installation meeting for masonry construction. Tests and inspections will be conducted to ensure compliance of masonry construction. Inspections related to masonry wall construction will include mortar preparation and placement, grout preparation and placement, embed plate installation, and reinforcing bar placement. The testing and inspection of non -load bearing walls and infills is not required for this project. The sampling and testing of masonry grout will follow the guidelines of ASTM C1019. Eight (8) grout tests and sets of specimens are planned to be taken throughout the duration of the project. A set of four (4) grout samples will be collected during each day of grout placement. These samples will be cured for 24 hours on site then collected by a representative to transport to our facility for curing and compression at 7 and 28 days. The sampling and testing of masonry mortar will follow the guidelines of ASTM C780. Three (3) mortar tests and sets of specimens are planned to be taken throughout the duration of the project. A set of three (3) mortar cubes will be collected at the time of each of the ordered tests. These