Concrete. Test for general quality, such as: slump, air entrainment, cylinder test, core test, Swiss hammer.
Concrete. All concrete shall be Mixed in concrete mixer and compacted by mechanical vibrators. Slump test shall be carried out during concreting and sample test cubes prepared and tested for strength in accordance with the code. The Department will carry out the testing at the cost of contractor. The results of the tests shall conform with the required standard and if the Engineer-in- charge considers that a structural test is necessary, the same shall be carried out as instructed by the Engineer-in-charge at the contractor's expense and should the result of this be unsatisfactory the contractor will be bound to take down and reconstruct the particular portion of which has given unsatisfactory test results.
Concrete. All sections must be constructed of concrete with a compressive strength of 3000 PSI at 28 days.
Concrete. All concrete must cure for at least ________ prior to arrival of the Supplies and related equipment in order to avoid _______________ problems.
Concrete. 4.40.1 Concrete shall be composed of one (1) part Portland cement, two (2) parts sand and four (4) parts coarse aggregate, measured by volume. The concrete shall not develop initial set in less than thirty
Concrete. Mix and place all concrete in accordance with Section 500 of the Specifications where applicable or in accordance with Special Provision 500 – Concrete Structures (Mass Concrete) if shaft diameters are greater than 6 feet (1.83 meters), and the requirements herein stated. Place concrete as soon as possible after all excavation is completed and reinforcing placed and supported. Place concrete continuously in the caisson to the top elevation of the caisson. Place concrete using a gravity feed watertight tremie consisting of a pipe at least 8 inches (200 mm) in diameter with a xxxxxx at the top. Concrete may be placed by pumping through a supply line if the Engineer approves this method. Provide a pump supply line with sections that have watertight couplings. Prevent concrete from mixing with fluid from the excavation within the tremie or pump supply line by sealing the end of the line with a foam plug or other device approved by the Engineer. At the beginning of concrete placement, place the tremie on the bottom of the excavation until the tremie pipe and xxxxxx are filled with concrete. Raise the tremie only enough to induce concrete flow and do not lift it further until the discharge end is immersed at least 10 feet (3 meters) into the deposited concrete. If concrete placement by pumping is used, secure the supply line in place so that the discharge end will not lift off the bottom of the excavation more than 6 inches (150 mm) until at least 10 feet (3 meters) of concrete has been placed. Embed the discharge end of the tremie or pump supply line in the concrete a minimum of 10 feet (3 meters) throughout the remainder of the concrete pour. Place concrete continuously in the caisson to the top elevation of the caisson until good quality concrete is evident at the top of the caisson, to the satisfaction of the Engineer. Remove any concrete that becomes contaminated with slurry, soil, or other deleterious materials near the top of the caisson and replace it with uncontaminated concrete or chip the contaminated concrete back to sound concrete after the concrete has dried at no additional cost to the Department. Once concrete placement in the caisson has begun, place all concrete in the caisson within two hours. Adjust the retarder or water reducing agent as approved by the Engineer, for the conditions encountered on the job so that the concrete remains in a workable plastic state throughout the pour. If a longer placement time is needed, provide a concrete desi...
Concrete. 1) Preliminary Drawings of all major structures showing overall dimensions, wall/slab thicknesses, etc. Dimensions may not be on structural drawings, but will be available on Architectural or Mechanical drawings.
Concrete. Installation and repair of concrete sidewalks and paths.
Concrete. This section covers the requirements for concrete materials and mixing, placing, jointing and curing concrete. The materials for concrete shall be as follows: - Cement used in all concrete mixes shall be portland cement meeting the requirements of ASTM C150, Type I or II. At the Contractor's option , high-early strength cement, ASTM C150 Type III, may be used to achieve 28-day strength in 7 days. - All aggregates shall meet the requirements of ASTM C33. - Plasticizers and retarders may be used to control setting times and to obtain optimum workability. Air entrainment of 4-6% by volume shall be used in all mixes. The use of calcium chloride is not permitted. Admixtures shall conform to ASTM C260 and ASTM C494. - Clean water of potable quality shall be used in all mixes. - Expansion joint filler shall be premolded conforming to ASTM D1751. - Water stops shall be polyvinyl chloride (PVC) conforming to U.S. Corps of Engineers Specification CRD-C572, or water swelling rubber or bentonite seals. - Curing materials shall conform to ACI-301. Waterproof sheet material shall meet ASTM C171 requirements and curing compounds shall conform to ASTM C307. - Non-shrink grout shall be used where specifically required by design, i.e., where close tolerances are required to be maintained, such as required for the proper installation of rotating equipment. Structural steel column base plates need not be set with non-shrink grout. Grout shall be non-metallic, non-corrosive, non-staining and have a 28-day strength of 5000 psi minimum. The Contractor shall furnish all materials, labor, supervision, services, tools and equipment required for all design fabrication and construction for concrete work required for all foundations, equipment pedestals and bases, concrete pavement, sidewalks, curbs, floor slabs and other plant structures. --------------------------------------------------- ------------------------ EPC - Exhibit B ------------------------ TENASKA GEORGIA GENERATION PROJECT Page 34 of 132 --------------------------------------------------- ------------------------ --------------------------------------------------- ------------------------ Reinforced concrete structures shall be designed in accordance with ACI 318, Building Code Requirements for Reinforced Concrete and the Southern Building Code (SBCCI). The system of concrete and steel strength (at 28 days) combination shall be as follows: - Most Applications 4,000 psi - Duct Banks 2,000 psi The concrete shall be mixe...
Concrete. The appearance of concrete depends on a number of factors most linked to when the concrete was initially poured and cured. When concrete with dirt, mold, mildew, algae and other pollutants and stains is cleaned, the concrete will then reveal any and all imperfections that the pollutants and stains have covered up. The customer understands that not all concrete will look the same even on the same driveway, patio, sidewalk, or concrete slab.