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backfill is defined as all replaced excavation and new embankment material that is adjacent to the three sided structure, wingwalls and headwalls. backfill material within zone a must meet the material specifications of aashto soil type a1 or a3. spans less than or equal to 24'' with fill height less than 12'' may also use aashto soil type a2 or
(B) Structure Backfill Material B. When tested according to AASHTO T 176, the sand equivalent value of the backfill material shall be equal to or greater than the surrounding soil. Structure fill or backfill material placed behind bridge abutments, wingwalls and retaining walls shall be structure backfill material A.
Effective with the December 2019 Letting 106 2020 Standard Specifications Section 210 Structure Backfill Description (1) This section describes furnishing backfill materials and backfilling excavations for bridges, box culverts, retaining walls, and structural plate pipes and pipe arches.
Backfill General (1) Furnish materials consisting of either sandsized particles or sandsized particles mixed with gravel, crushed gravel, or crushed stone. Do not use materials classified under as crushed concrete, reclaimed asphalt, reprocessed material, and blended material. The contractor may use
Where backfill material is being placed too close to the structure to permit compaction with blading and rolling equipment, use mechanical tamps and rammers to avoid damage to the structure. Avoid wedging action of backfill against structures. To prevent such action, .
MeMo to Designers 55 • April 2014 2 55 Design Criteria of stanDarD earth retaining systems LRFD Soil Backfill Parameters • Unit Weight of Soil, γ. s = 120 pcf • Soil Cohesion, c .
AASHTO serves as a liaison between state departments of transportation and the Federal government. AASHTO is an international leader in setting technical standards for all phases of highway system development. Standards are issued for design, construction of highways and bridges, materials, and many other technical areas.
Material suitable for backfill and not needed for backfill at the structure, but needed elsewhere shall be stockpiled until moved and used elsewhere. BACKFILL A. The excavation shall then be brought to the structures bottom elevation by placing and compacting 6inch layers of Oolitic limerock (or material previously defined) to 95 percent of
Apr 01, 2009· Structure Backfill Types The structure backfill type shall be as specified. Within each of the following structure backfill types, the Contractor shall choose from the listed options for each type: (a) Type 1 1. structure backfill in accordance with 2. nonremovable or removable flowable backfill in accordance with 213. (b) Type ...
Fill and backfill adjacent to any type of structure shall not be compacted with heavy equipment; Hand operated equipment shall be used within meters of any structures. Every effort shall be made to place backfill materials symmetrically and in uniform layers to prevent unnecessary eccentric loading on a structure or foundation.
aashto specifiions for crushed stone as backfill materials. Section 812 Backfill Materials Georgia Department of . Section 812—Backfill Materials Page 3 1 Crushed Stone Use a material manufactured from Class A or B stone free of soil overburden and having a .
method in use. Backfill material shall be approved by the Engineer. Special care shall be taken in placing the backfill. Great care shall be used to obtain thorough compaction under the haunches and along the sides to the top of the pipe. The backfill shall be placed in loose layers not exceeding 6 inches (150 mm) in depth under and around the
Highway and Transportation Officials (AASHTO) allow corrugated metal pipes to reach their full design strength when backfill materials meet AASHTO M 145 requirements for A1, A2 or A3 materials, compacted to a minimum 90 percent of their standard proctor density. Table 1 provides a comparison of AASHTO and the Unified Soil Classification system.
Note that figure 20 represents the load–settlement performance of a GRS structure with reinforcement spaced at 8 inches, well–compacted AASHTO No. 89 fill material (having a friction angle of 48 degrees and no cohesion), and 4,800 lb/ft woven PP geosynthetic reinforcement. Other materials have also been tested and are shown in the synthesis ...
Structure backfill shall have a minimum resistivity of 3000 Ω cm at 20 saturation when tested in accordance with AASHTO T 288. The pH of the backfill material shall be in the range of 5 to 10 as determined in accordance with AASHTO T 289. The maximum soluble salt content of the backfill material shall not exceed
The minimum amount of construction equipment needed to properly place and compact fly ash in an embankment or structural backfill includes a bulldozer for spreading the material, a compactor, either a vibrating or pneumatic tired roller, a water truck to provide water for compaction (if needed) and to control dusting, and a motor grader, where ...
may control the type of material to be used at a site, and a specific design for each type of material available is necessary. Pipe Arches. Pipe arches, sometimes referred to as "squash pipe," are circular culverts that have been reshaped into a structure with .
OA FREQUENCY GUIDE SCHEDULE for Minimum Materials Sampling, Testing, and Inspection . CP = Colorado Procedures CPL = Colorado Procedure Laboratory, T = AASHTO Procedures, C = ASTM Procedures . CDOT Materials FormsSerialized (2017 and newer) can be located at: ... Item 206 Structure Backfill, Note on rocky material. CP 25. for 1point check ...
structure is highly dependent upon the backfill material and backfilling process. The National Corrugated Steel Pipe Association publishes specific backfill selection and backfill process guidance within the Corrugated Steel Pipe Design Manual. ASTM A807 also provides comprehensive installation guidance for steel
MATERIALS a. General. ... plate washers or AASHTO M 270 (ASTM A709) Grade 36 plate washers hot dip galvanized as per AASHTO M 111 (ASTM A123) in connections. ... Use a minimum of 2 feet of approved granular material to backfill the sides and top of the structure. When manufacturer''s recommendations require more granular material ...
expansion joint material shall meet aashto specification m213. structure excavation and backfill shall be as shown on the plans. contract requirements. local safty laws, regulations and requirment and all applicable loading and lifting which comply with all federal, state and devise and excute project specific procedures for handling,
2. The material shall meet ASTM D2488 angular or subangular classification. 3. Deleterious materials shall be limited to: a) maximum 20% reclaimed pavement materials and b) no wood, soil or organic materials are permitted 4. Material hardness – Maximum loss of 40% in the LA Abrasion test (AASHTO .
This means the bridge structure itself and the backfill soils surrounding the structure interact with each other to support the loads. In effect, the backfill material is part of the bridge. Because of this interaction, the bridge structure is typically lighter, and there can be significant savings in structure costs. ... AASHTO (American ...
Lift height will depend on the equipment and material used and the contractor''s ability to properly compact the material. If the backfill so tested does not meet the requirements of this chapter, the trench shall be reexcavated and the backfill replaced in accordance with this chapter. [Ord. O132015 § 1 (Exh. A); Ord. O032010 § 1 (Exh.
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