2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS CATEGORY 400 STRUCTURES SECTION 477 — REPOINTING EXISTING MASONRY
477.01 Description
Clean and repoint existing masonry as shown in the Contract Documents.
477.02 Materials
All mortar shall meet the requirements specified in 903.06 and match the color of existing mortar as nearly as possible.
477.03 Construction
Thoroughly clean the existing joints of all loose mortar and foreign material for a minimum depth of twice the width of the joint or 1 in. from the face of the masonry whichever is greater. Then fill joints with mortar that is well packed and finished. Ensure that the finish of the new masonry pointing matches the existing as nearly as possible. After pointing is completed and the mortar is set, thoroughly clean the exposed surface of the masonry of excess mortar. Prevent any material from entering any waterway.
477.04 Measurement and Payment
The payment will be full compensation for cleaning, any clearing of vegetation required to access the work site and expose the areas to be repaired, and for all materials, labor, equipment, tools, and incidentals necessary to complete the work.
477.04.01 Repointing of existing masonry will be measured and paid for at the Contract unit price
per linear foot of the repaired areas for the pertinent Repointing Masonry Joints item.
477.04.02 Repointing of existing masonry will not be measured but will be paid for at the Contract
lump sum price for the pertinent Repointing Masonry Joints item. 478 — JACKING BEAM OPERATIONS CATEGORY 400 STRUCTURES SECTION 478 — JACKING BEAM OPERATIONS
478.01 Description
Jack existing beams for repairs
478.02 Materials
Refer to the Plans and Section 430, Section 436, and 902.11.
478.03 Construction
Refer to the Plans. Use the shielded metal-arc process for all field welding. Adhere to all requirements of the Contract Documents except that for temporary installation, the requirements for radiographic and ultrasonic inspection will be waived if the Engineer’s visual inspection indicates the welds are satisfactory. At the Contractor’s option, submit an alternate jacking beam or method to those specified in the Contract Documents to the Engineer for approval. Alternate jacking beams shall comply with the following restrictions:
a.The alternate jacking beam material must be in new condition.
b.The section modulus and web area (depth x thickness) shall not be less than the jacking beams shown in the Contract Documents unless otherwise specified.
c.If the connection detail, stiffener plate detail, or jacking method is changed; submit detailed calculations to the Office of Structures for approval. These calculations shall be stamped by a professional engineer registered in the State of Maryland. Set jacking beams level unless otherwise specified in the Contract Documents. The existing anchor bolts may be cut above the nut to achieve a level beam. In no instances, will it be permitted to chip away the concrete end diaphragms to achieve a level jacking beam. Thoroughly clean areas under the proposed jacks to provide a flat, clean jacking surface. When jacking surfaces are not level or have slightly deteriorated concrete areas, use nonshrink grout to repair them to a flat level surface. The minimum thickness of the grout shall be as recommended by the manufacturer. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
Source: Maryland Standard Specifications for Construction and Materials, 2025 Edition. Pages 599–599 of 1,113.