Additional testing and inspecting, at Contractor’s expense, will be performed to determine compliance of corrected work with specified requirements.
Blemishes occurring after delivery are normally repaired before final joint sealing and cleaning as weather permits.
Repairs will be permitted provided structural adequacy of units and appearance are not impaired.
The precast concrete manufacturer should develop appropriate repair mixtures and techniques during the production sample approval process.
Mix patching materials and repair units so cured patches blend with color, texture, and uniformity of adjacent exposed surfaces and show no apparent line of demarcation between original and repaired work, when viewed in typical daylight illumination from a distance of 20 feet (6 m).
Prepare and repair damaged galvanized coatings with galvanizing repair paint according to ASTM A780.
Retain paragraph above if using galvanized anchors, connections, and other items; retain first paragraph below if items are prime painted.
D. Wire brush, clean, and paint damaged prime-painted components with same type of shop primer.
E. Remove and replace damaged architectural precast concrete units when repairs do not meet
Specify whether erector or precaster does cleaning under the responsibility of General Contractor.
Clean all surfaces of precast concrete to be exposed to view, as necessary, prior to shipping.
Clean mortar, plaster, fireproofing, weld slag, and any other deleterious material from concrete surfaces and adjacent materials immediately.
Clean exposed surfaces of precast concrete units after erection and completion of joint treatment to remove weld marks, other markings, dirt, and stains.
1.Perform cleaning procedures, if necessary, according to precast concrete fabricator’s recommendations. Clean soiled precast concrete surfaces with detergent and water, using stiff fiber brushes and sponges, and rinse with clean water. Protect other work from staining or damage due to cleaning operations.
2.Do not use cleaning materials or processes that could change the appearance of exposed concrete finishes or damage adjacent materials.