Project manual for the Orangery-1994

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PART f DIVISION 4- MASONRY Nelson Orangery 9415.00 October 3, 1994 1 04200. CONCRETE UNIT MASONRY A. STANDARDS 1. Concrete masonry construction shall conform to all requirements of "Specification for Concrete Masonry Construction (ACI 531.1-76),"published by the American Concrete Institute, Detroit, MI, except as modified by the supplemental requirements below. 2. Concrete masonry construction shall conform to all requirements of"Recommended Practices and Guide Specifications of Cold Weather Masonry Construction"published by the International Masonry Industry All-Weather Council. (The following table is an excerpt; see the complete document for all of the requirements.) Work Day Temp, Construction Requirement Protection Rea. (a) Above 40 F Normal masonry procedure Cover walls with plastic or canvas at end of the work day to prevent water from entering the masonry. (b) 40 F to_32 F Heat mixing water to produce Cover walls and materials mortar temperatures between to prevent wetting and 40 F and 120 F freezing. Covers should be plastic or canvas. (c) 32 F to 25 F Heat mixing water and sand to With wind velocities over produce mortar temperatures 15 mph provide between 40 F and 120 F windbreaks during the work day and cover walls and materials at the end of the work day to prevent wetting and freezing. (d) 25 F to 20 F Mortar on boards should be Maintain masonry above maintained above 40 F freezing for 16 hours using auxiliary heat or insulating blankets. (e) 20 F to 0 F Heat mixing water and sand to Provide enclosures and produce mortar temperatures supply sufficient heat to between 40 F and120 F maintain enclosure above 32 F for 24 hours. B. REQUIREMENTS OF OTHER SECTIONS 1. See Division 7 and the Drawings for any dampproofing required at concrete block retaining walls. C. SUPPLEMENTAL REQUIREMENTS TO ACI 531.1-76: SECTION 2 - MASONRY PART 2.2- PRODUCTS 2.2.1.2 Hollow bad-bearing concrete masonry units must conform to ASTM C90.