Ncma tek bulletin 32a grouting for concrete masonry walls. In the absence of other information, the methods and recommendations of the national concrete masonry association ncma, brick institute of america bia, and rocky mountain masonry institute rmmi shall be followed. Ncma srwu2 determination of shear strength between segmental concrete units. Cast segmental retaining wall units, astm c 72 ref. To order a complete tek manual or tek index, contact ncma publications 703 71900 references 1.
Work shall consist of furnishing and constructing a rockwood classic 8 unit segmental. National roofing contractors association 8600 bryn mawr avenue chicago, illinois 60631 3126930700 january 1983 revised januaty 1985. Comply with national concrete masonry association ncma tek bulletins, and as specified. Size and place cut pieces appropriately to maintain consistency and bond. Bgtt and eni for the kind permission to allow ncma1 data to be included. Complete masonry construction using procedures and. Architectural concrete masonry exteriorsingle wyth walls and wall veneer facing. Xx yyy wwhhll, where xx describes the number of scores or ribs, yyy describes the architectural finish, and wwhhll describes the overall nominal unit dimensions for width, height, and length. Cma part 1 study unit 1 external financial statements and revenue recognition core concepts. Concrete masonry terms, ncma tek 14, national concrete masonry association, herndon, va, 2004, 41 42 chapter 2 limitations commentary chapter 2. Segmental retaining walls best practices guide 3 segmental retaining walls best practices guide for the speci.
Recommended practices and guide specification for hot weather masonry construction. Masonry tech notes technical notes on brick construction bia technical note 1 cold and hot weather construction bia technical note 10 dimensioning and estimating brick masonry bia technical note 11 guide specifications for brick masonry, part 1 bia technical note 11a guide specifications for brick masonry, part 2 bia technical note 11b guide specifications for. Design and construction of drystack masonry walls tek 1422. Tables 1 through summarize section properties of grouted and ungrouted 4, 6, 8, 10, 12, 14 and 16in. Page 2 of 4 calculations in accordance with article 2. Both units were designed with a structural pin connection and granular interlock. Recommended practices and guide specification for cold weather masonry construction. A horizontal offset between head joints in successive courses of onethird and onequarter the unit length is called third bond and quarter bond, respectively. Note that prior to astm c9006, two minimum face shell thicknesses for units 10 in. This standard provides general guidance concerning the specific preferences of the texas state university for a.
The ncma research and development laboratory is devoted to. National concrete masonry association 750 sunrise valley drive, herndon, virginia 20171. Drystacked concrete masonry units used as the retaining wall fascia. This standard provides general guidance concerning the specific preferences of the texas state university for a segmental retaining wall up to 50 high. Subcontract management from a to z is a oneday national education seminar nes that presents subcontract management in the u. Part 2 structural use of reinforced and prestressed masonry. August 2019 section 04 20 00 unit masonry part 1 general 1. Ncma srwu2 test method for determining shear strength of srw 1. Soil which is used as fill behind the srw unit and within the reinforced.
Structural restoration of the jasmine complex and implications for. National contract management association ncma chesapeake. Geosynthetic minimum length shall not be less than 60% of the height of the wall h. Blockflash single wythe concrete masonry unit drainage system this section may be used as a narrow scope, standalone section or may be modified and incorporated into broad scope section 04 20 00 unit masonry part 1 general 1. Shear devices shall protrude at least 1 inch into receiving openings of the srw units.
D minimum normalized web area does not apply to the portion of the unit to be filled with grout. Ncma tek bulletin 31c all weather concrete masonry construction. External financial statements and revenue recognition. Tool joints neatly after they are thumb print hard. Masonry units 04 220 1 product data sheet lighting at a reasonable distance from the wall for even illumination. Institute protective measures as required to ensure that unit masonry work will be clean and undamaged at substantial completion. Financial reporting, planning, performance and control. The mason contractors association of america mcaa is committed to preserving and promoting the masonry industry by providing continuing education, advocating fair codes and standards, fostering a safe work environment, recruiting future manpower, and marketing the benefits of masonry materials. Keystone compac unit was introduced, a smaller 1 foot 300 mm deep unit. The general contractor shall submit the following items for approval in accordance with the conditions of the contract and the division 1 submittal procedures section.
Check your inbox for a surveymonkey email from ncma for your invitation to vote. C coorrnneerrssttoonnee ssppeecciiffiiccaattiioonnss. Standard specifications for the design and construction of load bearing concrete masonry, ncma tr 75b. Masonry units 04 2201 product data sheet lighting at a reasonable distance from the wall for even illumination. An information series from the national authority on concrete masonry technology ncma tek 25b replaces tek 25a 1 new concrete masonry unit configurations under astm c90 tek 25b unit properties 2012 introduction the most widelyused standard for specifying concrete masonry units in the united states is astm c90, standard specification for loadbearing concrete masonry units.
The percentages show the relative weight range given to each section in the exam. External financial reporting decisions 15% preparation of financial statements. The ncma research and development laboratory is devoted. Sec tion includ esconcre ma onry uni work as shown and specifi d. Work shall consist of furnishing and constructing a rockwood classic 8 unit segmental retaining wall in accordance with these specifications to the lines and grades shown on the. Outdoor dance activation, scheduled for wednesday, may 20. Solid concrete paving units manufactured to comply with astm c936 or csa a231. Level 1 h101da introduction to srw systems this module provides a basic overview of segmental retaining wall systems. Segmental retaining walls best practices guide ncma etek. Usace navfac afcec nasa ufgs04 20 00 november 2015 change 2 0519. The concrete masonry unit s role and contribution to the concrete masonry wall assemblys water penetration resistance depends in part on how the units are used in the design.
Ncma tr127b design manual for segmental retaining walls 1. Drainage aggregates shall be placed in all unit voids and 6 to 12 behind the wall units with uniform particle size less than 1 25mm and not more than 5% passing through the no. Ncma tek bulletin 33a reinforced concrete masonry construction. An information series from the national authority on concrete masonry technology ncma tek 25b replaces tek 25a 1 new concrete masonry unit configurations under astm c90 tek 25b unit properties 2012 introduction the most widelyused standard for specifying concrete masonry units in the united states is astm c90, standard specification for loadbearing concrete masonry. Comply with directions of concrete unit masonry manufacturer and ncma tek bulletin no. Scrape off adhered mortar particles by hand, using nonmetallic tools. K instructions geogrid keywall appedix keystone r e t a i n i.
Prior to the start of work, the owner shall obtain construction drawings and design calculations. Army materiel command contracting support to the warfighter army contracting command unclassified expeditionary responsive innovative national contract management association ncma chesapeake chapter meeting debriefings 16 december 2009 kathryn ortelthatcher rdecom contracting center cc. Keystone compac unit was introduced, a smaller 1foot 300 mm deep unit. Struts two struts shall be furnished for each sleeveit unit. Technical construction guidelines page 1 of 3 update. Afripedia screenings and discussion, part 1, scheduled for thursday, may 21. This section specifies requirements for construction of masonry unit walls.
Furnish labor, materials, and equipment and perform functions required in the. The units have the stability of a large mass, but are easier to handle, lighter to place, and quicker to install than boulders, crib structures or thinshelled panel structures. Also included is the furnishing and installing appurtenant materials. This standard includes criteria for minimum compressive strength, maximum water absorption. Subcontract management under a government prime contract is a hybrid between the companys commercial subcontracting requirements and the federal governments subcontracting. K instructions geogrid keywall appedix keystone r e t a i.
Make all unit cuts, including those for bonding, holes, and boxes, etc. Ncma tek 24 specifications for segmental retaining wall units. Acquisition and interpretation of 3d seismic data over ncma4 and block22 revealed a number of low impedance. Concrete unit masonry, including groundface units where indicated. Work shall consist of furnishing and construction of a county materials retaining wall system in accordance with these specifications and in reasonably close conformity with the lines, grades, design, and dimensions shown on the plans. Table 1minimum face shell and web requirementsa open end or shaped unit double open end unit ond beam units intel. The length of that portion shall be deducted from the overall length for the calculation of the minimum web crosssectional area. Section 04 05, masonry mortaring, section 04 05 16, masonry grouting.
The unit characteristic requirements for contributing to success of the exterior wall may vary depending on the design of the masonry wall in which it is used. In the absence of other information, the methods and recommendations of the national concrete masonry association ncma, brick institute of america bia, and rocky mountain masonry institute rmmi shall. Work includes furnishing and installing segmental retaining wall srw units to the lines and grades designated on the construction drawings or as directed by the architectengineer. Design and detail control and expansion joints to meet, at least, the minimum. Ncma srwu1 determination of connection strength between. Again, the control joint goes under and up the side of the lintel, and allowance for movement between replacing all or part of a vertical mortar joint with a backer rod and sealant. Thermal catalog of concrete masonry assemblies york building. Architectural concrete masonry units, tek 23a, national concrete masonry association, 2001.