Laserfiche WebLink
A. Comply with the applicable requirements of "CONCRETE" Section in the <br /> specifications and as herein specified. Concrete supplier may submit his own <br /> plant design mix for approval provided the mix has a record of proven <br /> performance acceptable to the Architect or Engineer and can be substantiated by <br /> satisfactory supporting data. Concrete mix shall produce standard-weight <br /> concrete with the following properties to be verified by the use of the appropriate <br /> listed test methods: Compressive Strength : 3000 psi at 28 days - tested <br /> according to ASTM Designation C31 (AASHTO T23) Slump Range: 3-4 inches - <br /> tested according to ASTM Designation C143 9AASHTOT119) <br /> PART 3 - EXECUTION OF WORK <br /> 3.01 INSPECTION <br /> A. Examine the areas and conditions under which concrete paving is to be installed. <br /> Notify the Architect or Engineer of conditions detrimental to the proper and timely <br /> completion of the work. Do not proceed with the work until all unsatisfactory <br /> conditions have been corrected. <br /> 3.02 SUBGRADE PREPARATION <br /> A. Remove loose material from the subgrade. Subgrade must be compacted to a <br /> density of at least 98% of the maximum density as determined by AASHTO T180 <br /> before placing concrete. Do not begin paving work until the subgrade is brought <br /> to grade and fully prepared, clean and ready to receive paving. Just prior to <br /> placing concrete, moisten subgrade as required to provide a uniform dampened <br /> surface at the time concrete is placed. <br /> 3.03 FORM PLACEMENT, CONSTRUCTION AND UTILIZATION <br /> A. Set forms to the required grades and lines to allow continuous progress of the <br /> work. Clean forms after each use and coat with form release agent as often as <br /> required to ensure separation from concrete without damage. Instead of using <br /> fixed forms, the Contractor may place concrete with a slipform paver designed to <br /> spread, consolidate, screed, and float-finish the freshly placed concrete in one <br /> complete pass of the machine. The slipform paver shall be operated with as <br /> neatly a continuous forward movement as possible and all the operations of <br /> mixing, delivering, and spreading concrete shall be so coordinated as to provide <br /> uniform progress with stopping and starting of the paver held to a minimum. The <br /> subgrade and slipform paver track area shall be brought to proper grade and <br /> cross section by means of a properly designed and operated machine. Disturbed <br /> grade shall be properly recompacted . If any traffic is allowed to use the prepared <br /> grade, the grade shall be checked and corrected immediately ahead of placing <br /> the concrete. <br /> 3.04 CONCRETE PLACEMENT <br /> A. Ready-mixed concrete shall be mixed and transported in accordance with the <br /> current Specification for Ready mixed Concrete ASTM Designation C94. Comply <br /> with the applicable requirements of "CONCRETE" Section in the specifications <br /> 08/12 02512-2 11-4179 <br />