Concrete Specifications. All concrete work shall be designed on the basis of “Strength Design” in accordance with ACI 318 “Building Code Requirements for reinforced Concrete.” Concrete work shall be proportioned in accordance with ACI 301 “ Specifications for Structural Concrete” and ACI 211.1 “ Recommended Practice for Selecting Proportions for Normal Weight Concrete”. Concrete slabs, patios, driveways, walls and foundations shall be constructed of a minimum 3000 to 3600 psi concrete, 28 day test, with a 4” minimum to 6” maximum slump maximum, air-entrained to 5 - 8%. No additional water shall be added to concrete after slump test is recorded. Cylinders shall be taken from every batch truck and tested for compressive strength at 7 and 28 days. Concrete should be a mix of high grade Portland cement, clean sand or granular fill and washed gravel or crushed stone as coarse aggregate per ACI 530. Maximum aggregate size shall be ¾”. All aggregates shall conform to ASTM C33. Gravel should be well graded and not exceed 1 1/2” in size. Water shall not exceed 5 1/2 gallons for each bag, unless sand is very dry. Concrete shall be mixed using an approved batch machine or mobile mixer until uniform in color and providing a 4” minimum to 6” maximum slump. 03100 – Concrete Formwork, Reinforcement and Materials Provide all labor, materials and equipment necessary for the completion of the plain and reinforced concrete called for on the plans. Concrete when deposited shall have a temperature ranging between a minimum of 50 degrees Fahrenheit and a maximum of 90 degrees Fahrenheit. Construction of Forms – Construct wood forms of sound material, and of the correct shape and dimensions, constructed tightly and of sufficient strength. Xxxxx and tie the forms together. Make joints and seams mortar tight. Install leakage control materials in accordance with manufacturer’s installation instructions. Chamfered Corners – Unless otherwise noted, provide chamfered corners on all exposed corners. Provide 3/4 inch moldings in forms for all chamfering required. Embedded Items – make provisions for sleeves, anchors, inserts, water-stops and other features. Form Ties – Use form ties of sufficient strength and in sufficient quantities to prevent spreading of the forms. Place ties at least 1 inch away from the finished surface of the concrete. Do not use ties consisting of twisted wire loops. Leave inner rods in concrete when forms are stripped. Space all form ties equidistant and symmetrical and line up both ver...
Concrete Specifications. All concrete work shall be designed on the basis of “Strength Design” in accordance with the “ Bermuda Building Code Requirements for reinforced Concrete.” Concrete work shall be proportioned in accordance with“ Specifications for Structural Concrete” and “ Recommended Practice for Selecting Proportions for Normal Weight Concrete”. Concrete slabs, patios and walls shall be constructed of a minimum 3000 to 3600 psi concrete, 28 day test, with a 4” minimum to 6” maximum slump maximum, air-entrained to 5 - 8%. No additional water shall be added to concrete after slump test is recorded. Cylinders shall be taken from every batch and tested for compressive strength at 7 and 28 days. Concrete should be a mix of high grade Portland cement, clean sand or granular fill and washed gravel or crushed stone as coarse aggregate per ACI 530. Maximum aggregate size shall be ¾”. All aggregates shall conform to ASTM C33. Gravel should be well graded and not exceed 1 1/2” in size. Water shall not exceed 5 1/2 gallons for each bag, unless sand is very dry. Concrete shall be mixed using an approved batch machine or mobile mixer until uniform in color and providing a 4” minimum to 6” maximum slump. 03350 – Concrete Repairs– Repair concrete surface defects by removing all loose concrete and cleaning surfaces and form or pouring of slab. Provide broom finish texture for all exterior slabs. Slope exterior patio or porch slabs away from building to match existing. Patch all voids and depressions exceeding 3/8 inch in any direction
Concrete Specifications. “Standard Minimum Concrete Specifications,” October 1963, revised May 1976, revisions approved jointly by the Xxxxxxx Xxxxxx, The Associated General Contractors of America, and Georgia Concrete and Products Association, Inc., successors to Georgia Ready-Mix Concrete Association are adopted as a minimum requirement.
