Specifications include, but are not limited to: The purpose of these specifications is to require the furnishing of the highest quality equipment, supplies, material and workmanship in accordance with the specifications. Unless otherwise specified, all materials and equipment offered by a bidder shall be new, unused, and of recent manufacture and suitable for their intended purpose. Concrete shall meet the requirements of Section 5 of the 2013 Edition of the City of Topeka Standard Technical Specifications as modified herein. The quantities listed are estimates only. The City reserves the right to decrease or increase the quantity dependent on actual needs. A. Strength – The minimum twenty-eight (28) day compressive strength for the various classes shall be as follows: i. Structure Class Concrete – 4,000 pounds per square inch a. Estimated Annual Quantity: 250 cubic yards ii. Pavement Class Concrete – 4,000 pounds per square inch a. Estimated Annual Quantity: 770 cubic yards iii. Commercial Class Concrete – 2,500 pounds per square inch, 5.0 sacks (470 lbs.) of cement per cubic yard. a. Estimated Annual Quantity: 50 cubic yards iv. Flowable Fill – shall consist of Portland cement, fly ash, water and fine aggregate. Accelerators may be used. Flowable Fill shall be self-leveling. The 28-day strength shall exceed 50 PSI but be less than 150 PSI, to permit future excavation. Mix shall be designed and tested by the suppliers. Typical proportions are 50 pounds cement, 240 pounds fly ash and 2,600 to 2,800 pounds sand per cubic yard. a. Estimated Annual Quantity: 3,550 yards; CONCRETE ADDITIVES (When Required) A. Plastic Fiber Additive – Synthetic macro fiber shall have a length between one and three-eighths inch (1 3/8”) and two inches (2”) and a length to diameter ratio of 75 to 90. The minimum tensile strength of the fibers is 90 psi. Fiber shall be added to concrete at a rate base on the manufacturer’s recommendations to provide a residual strength greater than 150 psi. It shall be mixed into the concrete according to the manufacturer’s requirements. B. Hot Water Additive – When authorized due to low air temperature, heated water may be used in the concrete. EXPANSION JOINT MATERIAL Expansion joint filler material shall be non-extruding and resilient filler conforming to the requirements of AASHTO M-213 and ASTM D-1751. The quantities listed are estimates only. The City reserves the right to decrease or increase the quantity dependent on actual needs. A. 4’ x 1/2" Expansion Joint – Estimated Annual Quantity: 350 feet B. 6’ x 1/2" Expansion Joint – Estimated Annual Quantity: 200 feet
