Specs - Concrete Masonry Unit.doc

Watervliet Arsenal Masonry IDIQ Facilities Engineering Post

TAWV-IMP-F

20PW027

SECTION 04 WVA 02

Concrete Masonry Unit (CMU)

PART 1 GENERAL

1.01 REFERENCES

The publications referenced within this specification are referred to by the basic designation only.

A. National Concrete Masonry Association (NCMA)

1. Building Block Walls, V0 6 (1988)

2. Concrete Masonry Bond Patterns, TEK 14-6 (1999)

3. Concrete Masonry Shapes and Sizes Manual, CM 260A (1997)

4. Inspection of Concrete Masonry Construction, TR 156 (1996)

5. Surface Bonded Concrete Masonry Construction, TEK 3-5A (1998)

B. Masonry Standards Joint Committee

1. Building Code Requirements for Masonry Structures, ACI 530-99/ASCE 5-99/TMS 402-99 (1999)

2. Specifications for Masonry Structures, ACI 530.1-99/ASCE 6-99/TMS 602-99 (1999)

C. American Society for Testing and Materials (ASTM)

1. Standard Specification for Loadbearing Concrete Masonry Units, ASTM C90-00 (2000) D. Watervliet Specifications

1. 09 90 00 Interior Paints and Coatings

1.02 SUBMITTALS

A. Government approval is required for submittals with a "G" designation; submittals not having a "G" designation are for information only. Submit the following in accordance with the “Statement of Work - SUBMITTAL REQUIREMENTS”:

1. SD-01 Preconstruction Submittals A. Material Safety Data Sheets (MSDS)

2. SD-03 Product Data

A. Mortar Mix, G

B. Replacement Concrete Masonry Unit (CMU) Example, G

PART 2 PRODUCTS

2.01 MATERIALS

A. Mortar

1. Mortar shall be of similar characteristics of the existing mortar in the project area.

2. This includes strength, texture, hardness, and color.

B. Concrete Masonry Units (CMU)

1. CMUs shall be similar to those in the surrounding area in size, color, texture, material strength etc.

PART 3 EXECUTION

3.01 Preparation

A. Contractor shall remove all broken and deteriorated CMUs within the project area.

B. Contractor shall remove all loose or damaged mortar that weakens the bond between units.

C. Contractor shall be cautious with powered equipment so that existing CMU is not damaged.

D. The joint shall be rinsed and brushed clean of all residual mortar, sand and other debris.

E. CMUs shall not be damaged or marred in the process of cleaning. Cleaning shall be limited to the removal of ordinary dirt and contaminants when necessary prior to repair, and the removal of excess mortar and residue from the masonry restoration work.

1. Contractor shall use the gentlest methods possible for cleaning masonry to achieve the desired results.

2. Cleaning shall proceed from top to bottom of the wall. If cleaning with water, the contractor shall temporarily caulk or otherwise protect open joints to prevent water from infiltrating into the interior of the structure from pressure spraying.

F. Contractor shall protect non-masonry materials and severely deteriorated masonry.

3.02 Repair

A. Contractor shall provide and replace any missing, broken, or deteriorated CMUs.

1. The configuration of the CMUs shall be consistent with the existing and any new bricks shall be laid in the same pattern.

B. Contractor shall replace mortar that was removed or is missing. New mortar shall match the finish, color, texture, and surface detail of the original surface.

C. Joint profile shall match profile of original mortar joints. If original joint profile is not present for matching, provide concave profile.

D. All repair work shall be conducted in compliance with the relevant standards, specifications, and resources cited in section 1.01 of this document.

E. After the work is complete, the area shall be cleaned and all excess mortar removed.

3.03 Finishing

A. After the mortar has set, the contractor shall furnish and apply paint to match that of the surrounding area.

B. Painting procedure shall follow specification 09 90 00 as referenced in section 1.01 of this document.

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GYPSUM BOARD

09 28 00 Concrete Masonry Unit - 04 WVA 02 - Page 1