Category:1064 Temporary Concrete Traffic Barrier
No apparatus is necessary for field evaluation of Three-Loop Barrier. Two-Loop Barrier still requires a stamp.
- (a) OK – MoDOT stamp.
Three-Loop Concrete Barrier
All barriers manufactured after January 1, 2004 must be Three-Loop barrier. The manufacturer is to provide certification that the barrier is in accordance with the specifications. District materials personnel may be requested by construction personnel to perform field inspection to determine if the barrier is damaged to the extent that the barrier cannot perform properly. Reasons for rejection would be as specified below in Reasons for Rejection.
Two-Loop Concrete Barrier
Only Two-Loop barrier manufactured before January 1, 2004 may be considered for acceptance. District materials personnel may be requested by the fabricator or contractor to re-stamp previously accepted, stamped barrier. Barrier not previously accepted and stamped will not be accepted. The barrier should be re-stamped if the previous acceptance stamp is legible and if the barrier is not damaged to the extent that it is felt that the barrier cannot perform properly.
Basis of Acceptance
Barrier that appears to be specification compliant may be accepted on certification. District Materials shall visit each plant a minimum of once each year and confirm that materials and barrier comply with specifications. More visits are justified when the plan’s processes are indicate potential for error and production that might not be specification compliant. District Materials shall have no responsibility for the NCHRP 350 Certification.
Reasons for rejection
These reasons are, but are not limited to:
- (a) Exposed steel reinforcement.
- (b) Damage to the connecting loops.
- (c) Missing chunks of concrete.
- (d) Excessive marring or scarring.
- (e) Extensive scaling of the concrete.
- (f) Misalignment of the connecting loops that would hinder insertion of the keeper pin.
Barrier is accepted on certification and visual inspection by Construction personnel, and although Material inspectors may be asked to assist them, Construction will be responsible for reporting it through SiteManager.
Distribute the reports for materials purchased under a MoDOT purchase order as described in 1101 Materials Purchased by a Department Purchase Order.
Certification (for Sec 1064.5)
For Sec 1064.5.1 The manufacturer shall provide certification to the contractor that the barrier is in accordance with the contract documents. In place of a stamp on Two-Loop barrier, a certification may be provided stating the production date was before January 1, 2004.