2008-213 (5) - Laserfiche WebLink

Home Browse Search

L 1 . The concrete shall be distributed on the subgrade to such depth that , when it is consolidated and finished , the thickness required by the Drawings will be obtained at all points and the surface will at no point be below the grade specified for the finished surface . The concrete shall be deposited on the subgrade in a manner which will require as little rehandling as possible . Placing of the concrete shall be continuous between transverse joints , without the use of intermediate bulkheads . 2 . Concrete shall be thoroughly consolidated against and along the faces of all forms by means of vibrators . Vibrators ( if needed ) shall not be permitted to come in contact with the subgrade or a side form . Vibration at any one location shall not continue so long as to produce puddling or the accumulation of excessive grout on the surface . In no case shall the vibrator be operated longer than 15 seconds in any one location . B . Striking-Off, Consolidating And Finishing Concrete : 1 . Immediately after the placing , the concrete shall be struck off, consolidated and finished , to produce a finished product conforming to the cross section , width and surface finish required by the Drawings and Specifications . 2 . After the concrete has sufficiently set a minimum of 12 hours , the Contractor shall remove the forms and shall backfill the space on each side . The earth shall be compacted and graded in satisfactory manner without damage to the concrete work . Honeycombs shall be filled with sand cement mortar. Plastering will not be allowed on the face of the curb . Rejected curb , curb and gutter or valley gutter shall be removed and replaced without additional compensation . C . Final Finish : As soon as the water sheen has disappeared and just before the concrete becomes nonplastic , a light broom finish shall be given to the surfaces , except curbs . D . Joints : Joints shall be constructed where shown on the DRAWINGS . 1 . Transverse Construction Joints : Transverse construction joints shall be constructed at the end of all pours and at other locations where the pouring operations are stopped for as long as 30 minutes . Construction joints , however, shall not be placed within ten feet of any other transverse joint or of either end of a section of curb . If sufficient concrete has not been placed to form a slab at least ten feet long , the excess concrete , back to the last preceding joint , shall be removed . The joints shall be the full depth of the pavement and shall be formed by placing a wood or metal bulkhead accurately and securely in place , in a plane perpendicular to the profile and center line of the pavement . 2 . Transverse Contraction Joints : Transverse contraction joints shall be constructed along curbs , slabs on grade , and walks at the intervals specified in 3 . 03 D4 below, where shown on the DRAWINGS , and shall consist of planes of weakness created by sawing the surface of the pavement or tooling the joint . a . It shall be the Contractor's responsibility to see that the sawing equipment does not damage the curb , slabs on grade , or walk and to saw the transverse contraction joints as soon as the concrete has hardened to the degree that tearing and raveling are not excessive and within a maximum time of 12 hours after the pour. If, at any time , uncontrolled cracking occurs , the Contractor will be required to replace the affected sections and modify his methods . 02440=3 02440 — Concrete Driveways , etc . . .