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' 1 PART 3: EXECUTION 2 3 3.01 MASONRY - INSTALLATION 4 5 A. Masonry shall not be laid at temperatures below 40 degrees F, without the approval of the 6 Engineer, and all work shall be done in such a manner as to insure the proper and normal ' 7 hardening of all mortar. All masonry work shall be so protected and heated that the e temperature at the surface will not fall below 50 degrees F for a period of 72 hours after 9 placing. Any completed work found to be affected by freezing shall be taken down and 10 rebuilt by the Contractor at his expense. 11 12 B. All CMU shall be laid in a full bed of mortar, applied to shells only. Butter the vertical joint ' 13 of unit already set in the wall and all contact faces of the unit to be set. Each unit shall be 14 placed and shoved against 'he unit previously laid so as to produce a well-compacted 15 vertical mortar joint for the full shell thickness. Units shall set with all cells in a vertical 16 position. The moisture content of the units when laid shall not exceed 35 percent of the ' 17 total absorption as determined by laboratory test. 1e 19 C. CMU shall be laid in stretcher (running) bond with units machine sawn at panel ends to 20 produce the proper bonding as approved. Tool dense and neat. 21 22 D. Sizes shall be as specified and called for on the Drawings, and where "Soaps" and "Splits" 23 are used, the space between these members and the backup material shall be slushed full ' 24 of mortar. 25 26 E. Joints of all masonry shall be tooled in accordance with the following: ' 22 28 1. Wait until unit mortar is thumb-print hard before tooling joint. This may require as 29 much as 3 hours in the shade and 1 hour in the sun in the summertime. ' 30 31 2. The required personnel of the Contractor shall be kept on the job after hours, if 32 necessary, to properly tool joints. 33 ' 34 3. Both vertical and horizontal joints shall be maintained uniform in spacing. 35 36 4. Joints for CMU shall be 3/8-inch. Exterior and interior and vertical and horizontal joints 37 shall be concave rodded. 38 39 F. Install all frames required to be set in masonry, set masonry tightly against frames, build 40 in all frame anchors, and fill frames with mortar. ' 41 az G. All masonry slots, chases, or openings required for the proper installation of the work of 43 other Sections shall be constructed as indicated on the Drawings or in accordance with 44 information furnished before the work is started at the points affected. No chase shall cut 45 into any wall constructed of hollow units after it is built, except as directed and approved 46 by the Engineer. 47 as H. Surfaces shall be brushed as work progresses and maintained as clean as it is practicable. 49 Unfinished work shall be raked back where possible, and toothed only where absolutely 50 necessary. Before leaving fresh or unfinished work, walls shall be fully covered and 51 protected against rain and wind and before continuing work previously laid shall be swept ' CONCRETE MASONRY UNITS 050694 042003