The following specifications apply to arterial, collector, local and cul-de-sac streets. Refer to Indiana Department of Transportation Standard Specifications, 1988, or latest edition, § 500.
(A) Materials.
(1) The materials used in the concrete shall conform to the applicable sections of 501.02 and shall meet the requirements of the following subsection of § 900 of the current Indiana Department of Transportation Standard Specifications:
Fine Aggregate Size No. 23 | 903.01 |
Course Aggregate Class A Size No. 8 | 903.02 |
Portland Cement | 901.01 |
Water | 912.01 |
Air Entraining Admixtures | 911.03 |
Joint Materials | 905.00 |
Curing Materials | 911.01 |
Reinforcing Steel | 909.01 |
(2) All materials used in the construction of rigid pavement shall conform to the current Indiana Department of Transportation Standard Specifications and all current supplemental specifications.
(B) Design.
(1) The design of the mixture shall conform to § 501 of the current Indiana Department of Transportation Standard Specifications.
(2) Water cement ratio shall not be more than 5.5 gallons per 94-pound sack of cement.
(3) The fine aggregate shall be no less than 35% no more than 45% of the total weight of the aggregate in each cubic yard.
(4) Air entraining concrete shall be used with a constant of 5% to 8% by volume.
(5) Slump shall be no less than 1¼ inches nor more than 3 inches for machine placed concrete.
(6) Slump for hand placed concrete shall not be less than 2 inches nor more than 4 inches.
(7) Each cubic yard of concrete shall contain a minimum of 6 sacks of cement (94 pounds per sack) with a 7-day minimum compressive strength of 3,000 psi and with a 28-day minimum compressive strengths of 4,000 psi.
(8) The contractor shall be responsible for making all air and slump tests, and compressive strength test.
(C) Forms. The subgrade or subbase beneath the forms shall be cut to grade and compacted so that the forms, when set, will be firmly in contact with their whole lengths and at the required elevation. The forms must be set and secured so as to resist springing, settlement or other movement resulting from placement of concrete against them or from the weight or vibration of any equipment they support.
(D) Curing.
(1) Concrete shall be cured by protecting it against loss of moisture, rapid temperature change or mechanical injury for at least 96 hours after placement, unless the Street Commissioner orders a longer period.
(2) Materials used in the curing shall include white liquid membrane forming compound, white burlap-polyethylene sheets and white polyethylene sheeting film.
(3) Methods used in the curing process shall meet with the approval of the Street Commissioner.
(E) Joints.
(1) All longitudinal and traverse joints, and expansion joints shall be constructed and placed in accordance with the accompanying Standard Plan Sheets in Appendix A and B.
(2) The length between transverse saw joints shall not exceed 15 feet and in no case shall transverse construction joints be placed within 10 feet of a saw joint. Transverse saw joints shall be placed at all catch basins, inlets or manholes in line of pavement. The location of catch basins, inlets and manholes shall determine the exact location of joints. All joints shall be extended throughout the pavement section and curbs to full width of pavement.
(3) Expansion joints shall be sealed for the full width of the section and in accordance with § 905 of the Indiana Department of Transportation Standard Specifications. Expansion joint spacings shall not exceed 40 feet.
(4) Whenever the width between forms of pavement under construction is greater than 13 feet, longitudinal joints shall be constructed so as to divide the pavement into strips of equal width.
(F) Cold weather temperature limitations.
(1) No concrete shall be placed during the period from November 15 to April 15 without written authorization from the Street Commissioner.
(2) No concrete shall be mixed, placed or furnished when the natural light is insufficient, unless an adequate artificial lighting system is operated.
(3) Unless authorized in writing, mixing and concentrating operations shall be discontinued when the descending air temperature away from artificial heat reaches 40°F. and not resumed until an ascending air temperature away from artificial heat reaches 35°F.
(4) When concreting is authorized during cold weather, the aggregates may be heated by either steam or dry heat prior to being placed in the mixer. The apparatus used shall heat the mass uniformly and shall be so arranged as to preclude the possible occurrence of overheated areas which might injure the materials. Unless otherwise authorized, the temperature of the mixed concrete shall be no less than 50°F. and no more than 80°F. at the time of placing it in the forms.
(5) No concrete shall be deposited on a frozen subgrade.
(G) Opening to traffic.
(1) Pavement shall be closed to traffic for14 days after it is placed, except this period may be extended or decreased by the Street Commissioner if it is determined that the strength of the concrete justifies this action.
(2) As a guide in determining strength the contractor may prepare test beams. If the Street Commissioner decides that opening to traffic is to be based on test beams, the pavement shall not be opened until the test beams indicate a modulus of rupture of at least 550 psi. The beams shall be tested as simple beams with third point loading in accordance with AASHTO T97 by the contractor, except:
(a) The beam size shall be measured to the nearest 1/16 inch instead of 1/10 inch.
(b) The test results shall be discarded when the beam break occurs outside the middle 1/3 of the beam.
(Prior Code, § 155.38)