Crack Control in Concrete Masonry Walls
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1 Crack Control in Concrete Masonry Walls NCMA AIA/CES Course #:
2 The National Concrete Masonry Association is a Registered Provider with The American Institute of Architects s (AIA/CES). Credit(s) earned on completion of this program will be reported to AIA/CES for AIA members. Certificates of Completion for both AIA members and non-aia members are available upon request. This program is registered with AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.
3 Learning Objectives At the end of this program, participants will know: Causes of cracking in concrete masonry How to minimize cracking potential How to control cracking through the use of reinforcement and control joints How to maintain the fire resistance rating of a concrete masonry wall at a control joint
4 Causes of Concrete Masonry Cracks 1. Excessive deflection 2. Structural Overload TEK 10-1A
5 Causes of Concrete Masonry Cracks 3. Differential settlement TEK 10-1A
6 Causes of Concrete Masonry Cracks 4. Shrinkage Moisture change Temperature Length change Carbonation General trend = shrinkage Time (cycles) TEK 10-3
7 Shrinkage Cracking Restraint at bottom only
8 Shrinkage Cracking Restraint at top and bottom
9 Accommodating Movement Control Joints Used in concrete masonry construction Expansion Joints Used with clay brick
10 Purpose of Control Joints Relieve horizontal tensile stresses Reduce restraint and permit longitudinal movement Separate dissimilar materials
11 Goal of Crack Control Provisions Restraint at top and bottom Limit crack widths to less than 0.02 in (0.5 mm) able to be bridged by most coatings prevents water penetration TEK 10-3
12 Specifying Concrete Masonry Units Included in C 90 Compressive Strength Absorption Dimensional Tolerances Density Definitions Linear Drying Shrinkage C 90 Standard Specification for Loadbearing Concrete Masonry Units TEK 1-1E
13 Specifying Concrete Masonry Units NOT Included in C 90 Color Texture Density Water Repellency Fire Ratings Thermal Properties Sound Properties Most architectural concrete masonry units are custom made. Work closely with producers to get exactly what you want. C 90 Standard Specification for Loadbearing Concrete Masonry Units TEK 1-1E
14 Factors Influencing Concrete Masonry Drying Shrinkage Shrinkage increases as unit cement content increases as aggregate hardness decreases with increasing unit moisture content ASTM C 90 maximum allowable shrinkage = 0.065% TEK 10-1A
15 ASTM C 426 Drying Shrinkage Test Distance between gage points Typical field shrinkage Measured shrinkage 100% 70% 30% 10% CMU moisture content TEK 10-3
16 Type I and Type II CMU 3.1 Types - Two types of concrete masonry units are covered as follows: Type I, Moisture-Controlled Units - Units designated as Type 1 shall conform to the requirements of this specification Type II, Nonmoisture-Controlled Units - Units designated as Type 2 shall conform to the requirements of this specification with the exception of Table 1. This section was removed. Does not appear in C & later. TEK 1-1E
17 Moisture Content Appearance 90 % 70 % 50 % 30 % Should concrete block be wetted? Can concrete block be wet-cut? TEK 3-1C
18 Recommended Maximum Unit Moisture Content When 50% or more of the surface area is observed to be wet, the unit is considered to be unacceptable for placement. Damp surfaces are not considered wet. Test procedure: The surface is considered wet if moisture is observed and the surface does not darken when free water is applied. TEK 3-1C
19 Control Joint Spacing Recommendations h 25 feet maximum 1.5 h maximum So, for h = 8 ft, spacing < 12 feet for h = 20 ft, spacing < 30 feet 25 feet TEK 10-2C
20 Control Joint Spacing Recommendations 1. Control joint spacings are based on the use of horizontal reinforcement having an equivalent area of no less than in 2 / ft of height to keep unplanned cracks closed. Sum of steel area height TEK 10-2C
21 Control Joint Spacing Recommendations 1. Control joint spacings are based on the use of horizontal reinforcement having an equivalent area of no less than in 2 / ft of height. i.e. 9 gage joint reinforcement every other course (16 in.) or. TEK 10-2C
22 Control Joint Spacing Recommendations 1. Control joint spacings are based on the use of horizontal reinforcement having an equivalent area of no less than in 2 / ft of height.. by the use of bond beams and. #3 bars at 48 in. (4 ft.) #4 bars at 96 in. (8 ft.) #5 bars at 144 in. (12 ft.) TEK 10-2C
23 The Role of Reinforcement in Controlling Shrinkage Cracking Length after shrinkage if unrestrained Δ L Without horizontal reinforcement Length after shrinkage if unrestrained Δ L With horizontal reinforcement TEK 10-2C
24 Joint Reinforcement Primary function - control wall cracking associated with shrinkage Secondary Functions metal tie system for bonding structural reinforcement where allowed by code TEK 12-2B
25 Joint Reinforcement Consists of two or more longitudinal wires connected with cross wires forming a truss or ladder configuration Ladder Type Truss Type TEK 12-2B
26 Joint Reinforcement Must be spliced a minimum of 6 inches per MSJC It is permissible to lay joint reinforcement on face shell and mortar over it.
27 Control Joints Backer rod in mortar joint raked out to a depth of at least 3/4 Sealant - polysulfide, urethane, silicone or epoxy. Avoid oil-based caulks or other materials that dry out rapidly or do not bond effectively to masonry. TEK 10-2C
28 Types of Control Joints with Shear Resistance Preformed gasket Grout shear key TEK 10-2C
29 Types of Control Joints with Shear Resistance Dowels Smooth dowel - sleeved or greased on one end Special unit shape Horizontal reinforcement discontinuous at joint (except for structural bond beams) TEK 10-2C
30 Eliminating Control Joints With Reinforcement Control joints can be eliminated completely if enough horizontal reinforcement is provided. ie., where A s > A n Maximum reinforcement spacing for 8 in. CMU (not solid grouted): #4 bar - 24 inches #5 bar - 40 inches #6 bar - 48 inches TEK 10-1A & 10-3
31 Vertically Spanning Reinforced Walls Note: With reinforced masonry spanning vertically, shear transfer devices between panels are not necessarily needed.
32 4-hour Rated Control Joints Ceramic fiber blanket Note: Special unit shape and grout shear key type control joints are also rated 4 hours as long as they contain backer rod and joint sealant. TEK 10-2C
33 Control Joints TEK 7-1C
34 Control Joint Locations Typically use above grade in concrete masonry walls Shrinkage cracks are an aesthetic rather than a structural concern Generally not used below grade Less temperature and moisture variation TEK 10-2C
35 Control Joint Locations TEK 10-2C
36 Control Joints at Openings in Unreinforced Walls Openings less than 6 feet TEK 10-2C
37 Control Joints at Openings in Unreinforced Walls Openings more than 6 feet TEK 10-2C
38 Common Mistakes in Reinforced Walls The horizontal portion of the control joint is pinned by the vertical reinforcement and will not allow movement TEK 10-2B (Old)
39 Reinforcement (Typ.) Control Joint Pinned Control Joint/ Slip plane
40 TEK 10-2C Control Joint Pinned Reinforcement Crack
41 Control Joints at Openings in Reinforced Walls 12 min. Preferred strengthening of opening with reinforcement - extending lintel reinforcement and joint reinforcement under the sill TEK 10-2C and 10-3
42 Control Joints at Openings in Reinforced Walls Opening strengthened with joint reinforcement first two courses over opening and under the sill TEK 10-2C and 10-3
43 MSJC Detail for Intersecting Walls
44 Metal Straps at Wall Intersection Too Short
45 Metal Straps at Wall Intersection Too Short
46 Steel Beam Welded to Plates Embedded in Masonry Support Steel Beam
47 Steel Beam Welded to Plates Embedded in Masonry Support
48 Control Joints for Multi-wythe Walls If wythes are unbonded... consider control joint requirements separately for each wythe If wythes are bonded... continue control joints from back-up through face TEK 10-1A
49 Impact of Mortar Strength Weak mortar Strong mortar
50 Banding Considerations
51 Banding Considerations
52 Banding Considerations
53 CMU Band in Clay Brick Veneer Joint reinforcement w/ no slip plane option TEK 5-2A
54 CMU Band in Clay Brick Veneer Slip plane top and bottom of band option TEK 5-2A
55 Clay Brick Band in CMU Veneer TEK 5-2A
56 Summary NCMA Better manage movement through masonry systems by Proper design Using MSJC installation standards Proper location of control joints Proper use of bond beams Proper placement of joint reinforcement
57 Course Evaluations In order to maintain high-quality learning experiences, please access the evaluation for this course by logging into CES Discovery and clicking on the Course Evaluation link on the left side of the page.
58 Questions?? Thank you for your time! This concludes the American Institute of Architects s Course Sunrise Valley Drive Herndon, VA ncma@ncma.org Web:
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