SECTION UNIT MASONRY

Transcription

1 SECTION UNIT MASONRY PART 1 GENERAL 1.01 SUMMARY A. Furnish labor, materials, and equipment and perform functions required in the installation and maintenance of the work covered by this Section. 1. This work includes: a. Unit masonry work. b. Angles, sleeves, anchors, inserts, and ties required to be built into masonry work RELATED SECTIONS A. Steel reinforcement: Division - 3 B. Concrete: Division - 3 C. Mortar for Engineered Masonry: Division REFERENCES A. ACI 530, Specifications for Masonry Structures B. National Concrete Masonry Association: Standard Specifications for the Design and Construction of Load Bearing Concrete Masonry, NCMA TR-75B. C. Standard Building Code, latest edition QUALITY ASSURANCE A. Allowable Tolerances: 1. Plumb: ± 1/8 inch in 5-0, non-cumulative. 2. Horizontal Warp: ± 1/8 inch in 5-0, non-cumulative. 3. Level Courses in Wall Panels: ± 1/4 inch. SLID Stormwater Treatment Area Unit Masonry

2 1.05 SUBMITTALS A. Manufacturer s product data indicating compliance with specified requirements. PART 2 PRODUCTS 2.01 MATERIALS A. Portland Cement: ASTM C150-84, Type I, white or gray, as required. B. Masonry Cement: ASTM C91-83a, Type II. C. Sand: 100 percent passing a #8 sieve, and not more than 15 percent passing a #100 sieve, ASTM C D. Water: City potable water. E. Wall Reinforcement: Truss type welded wire masonry reinforcement, every second course, 9 gauge deformed wire, minimum weight for 8 inch wall 187lbs. per 1000 lineal feet,.048 sq. in. effective cross sectional steel area sized for width of block. 1. Comply with material requirements of ASTM Standard A 82 for high tensile steel. F. Anchors: Galvanized steel, minimum 12 inch long. G. Waterproofing: SEC #1, manufactured by SEC Manufacturing Co., or equivalent approved by Architect/ENGINEER. H. Concrete Block: Hollow load-bearing blocks, ASTM C-90, Grade N, Type I, moisture content requirements as stipulated in the guide specifications of the Florida Concrete and Products Assoc., Inc., weight of concrete more than 100 lbs. per cubic foot, compressive strength minimum 2000 p. s. i., nominal 8 inches by 8 inches by 16 inches. 1. Use standard blocks specially designed for use at jambs, beams, as required. PART 3 EXECUTION 3.01 MORTAR A. ASTM C270, Type S, with compressive strength of 1800 p. s. i. at twenty-eight (28) days, except that Type M with 2500 p. s. i. shall be used for reinforced masonry, when required by code and where indicated in the Drawings. 1. Ingredients: SLID Stormwater Treatment Area Unit Masonry

3 a. Portland cement, sand, hydrated lime and water, or masonry cement, sand, and water, with waterproofing added in accordance with the manufacturer s recommendations in mortar for exterior work. B. Mix mortar with minimum amount of water for satisfactory workability, and only in quantity needed for immediate use. 1. The mason may adjust the consistency. 2. Do not use mortar after the cement has begun its initial set. 3. Re-tempering will not be permitted. C. Pointing and Cleaning: On completion, point up exposed masonry, including joints at concrete columns and beams ERECTION 1. Fill holes and joints, remove loose mortar, cut out defective joints, and re-point only where necessary. 2. Masonry surfaces which are to be exposed, either painted or unpainted, shall be thoroughly cleaned free of mortar and stains and the joints pointed to obtain a level, smooth surface. A. Protect masonry work from damage, both in appearance and structural stability. 1. When rain is imminent and the work discontinued, cover the top of exposed masonry with a strong waterproof membrane, well secured in place. 2. Replace walls damaged during construction by wind action or failure to provide adequate protection and bracing, at no expense to the OWNER. B. Lay masonry in a common running bond, with vertical joints centered over masonry units below. C. Do not step back unfinished work for joining with new work. 1. Complete the last course laid between columns or walls before interrupting the day s work. 2. Toothing may be restored to only when specifically approved by the ENGINEER. 3. Remove loose mortar before new work is started, and wet the exposed joint thoroughly before laying new work. SLID Stormwater Treatment Area Unit Masonry

4 D. Built-In metal frames, vent blocks, access doors, and anchor bolts required by other trades as the work progresses. 1. Check with other trades for these items. E. Bed each course solidly in mortar, under face shells and webs, with vertical joints, slushed full and breaking halfway over units in the course next below, unless stacked bond is specified or noted in the Drawings. 1. Terminate walls under soffits of existing beams or slab construction slightly below the soffit and fill the remaining space with mortar after roof dead loads have been brought to bear on the structure. 2. Fill cavities with mortar in walls or partitions supporting plumbing fixtures or other items, voids at door jambs, and other spaces requiring grout fill, so that anchoring devices are in a solid field not less than 8 inches in every direction from their center. 3. Reinforce exterior walls by placing wall reinforcement as indicated in the Drawings. 4. Lap reinforcing sufficiently at splices (24 inches min.) to ensure continuity. F. Where block walls abut the vertical surface of a concrete member, provide cast-in-place recessed reglets for dovetail, corrugated, galvanized, 1 inch wide by 1/8-inch thick anchors at the end of each wall reinforcement run. 1. Where new block walls abut existing or previously erected concrete or masonry walls, secure anchors to existing wall by breaking through the block or chipping a recess in concrete and filling the space with grout, to prevent horizontal movement. G. Where walls with concrete filled voids are indicated, use regular concrete with pea rock aggregate and a compressive strength of 3000 psi at twenty-eight (28) days. 1. Comply with the requirements of Division 3. H. Do not wet concrete masonry units before laying. 1. Erect masonry plumb, true to line, level, and accurately spaced, with each course breaking joints with course next below, unless a stacked pattern is indicated in the Drawings. 2. Keep bond pattern plumb throughout, and corners and reveals plumb and true. SLID Stormwater Treatment Area Unit Masonry

5 3. Use power drills and saws for penetration of plumbing and other pipes in exposed locations. 4. Fill chases and knockouts after other work is installed in them to restore the integrity of the wall. I. For Exposed Masonry Finishes 1. Do not use cracked, spalled, or chipped blocks. 2. Use extra care to set blocks plumb, with even, uniform tooled joints, and to keep mortar smears from the face of the block. 3. Set courses level and line up the face of the units to provide a flat surface without warpage or breaks at the joints. 4. Strike the excess mortar from the joints with a trowel run parallel to the joint to avoid smearing the block face. 5. Joint thickness: 3/8-inch. 6. Keep setting mortar from the face of the block and wipe excess away before it sets. a. The blocks will remain exposed and painted in the finished condition. b. Replace blocks defaced by excessive mortar smears that interfere with the uniform texture and color of the wall. END OF SECTION SLID Stormwater Treatment Area Unit Masonry