SPEC MIX Core Fill Grout is produced under strict manufacturing standards, and complete quality control measures are implemented with each batch. For example, if your cinder blocks are 8x8 in (20x20 cm) and you want to use 2 blocks to make up the wall's width, your total wall width would be 16 in (40 cm). In partially grouted walls, grout is placed only in wall spaces containing steel reinforcement. Although not a code requirement, it is considered good practice (for all lifts except the final) to stop the level of the grout being placed approximately 1 in. 5), a third option became available – grout demonstration panels. Consolidation eliminates voids, helping to ensure complete grout fill and good bond in the masonry system. Repeat steps 6 and 7, adjusting the blocks to be flush and level; continue this process until the first … To prevent bridging, grout slump is required to be between 8 and 11 in. Reconsolidation acts to remove these small voids and should generally be done between 3 and 10 minutes after grout placement. He holds a Bachelor of Arts in history and journalism from the University of Nebraska-Omaha. the masonry has cured for at least 4 hours, grout slump is maintained between 10 and 11 in. Specification for Masonry Structures, ACI 530.1-05/ ASCE 6-05/TMS 602-05. This provision accommodates construction interference during installation as well as misplaced dowels. In certain instances, full head joint mortaring should also be considered when solid grouting since it is unlikely that grout will fill the space between head joints that are only mortared the width of the face shell, i.e., when penetration resistance is a concern such as storm shelters and prison walls. The openings must be large enough to allow debris to be removed from the space to be grouted. Historically, only two grout placement procedures have been in general use: (l) where the wall is constructed to pour heights up to 5 ft (1,520 mm) without cleanouts—generally termed “low lift grouting;” and (2) where the wall is constructed to a maximum pour height of 24 ft (7,320 mm) with required cleanouts and lifts are placed in increments of 5 ft (1,520 mm)—generally termed “high lift grouting.” With the advent of the 2002 Specification for Masonry Structures (ref. It may be advisable to delay grouting until the mortar has been allowed to cure, in order to prevent horizontal movement (blowout) of the wall during grouting. Reinforcement can be spliced by either contact or noncontact splices. See Steel Reinforcement for Concrete Masonry, TEK 12-4D for more information (ref. A second advantage is that high-lift grouting can permit constructing masonry to the full story height before placing vertical reinforcement and grout. The pilasters could be tied to the existing block wall by knocking holes in the existing block and grouting in anchor bolts, or by tying reinforcing rods to the reinforcement in the new pilaster. Repeat the above steps until you’ve completed the wall. Disclaimer: Although care has been taken to ensure the enclosed information is as accurate and complete as possible, NCMA does not assume responsibility for errors or omissions resulting from the use of this TEK. (3,860 mm) limitation may be permitted if the results of the demonstration show that the completed grout installation is not adversely affected. See Bracing Concrete Masonry Walls During Construction, TEK 3-4C (ref. If conditions permit and grout pours are so timed, consolidation of a lift and reconsolidation of the lift below may be done at the same time by extending the vibrator through the top lift and into the one below. Follow the manufacturer's instructions. Building Code Requirements for Masonry Structures, ACI 530-05/ASCE 5-05/TMS 402-05. Looking for advice on how to re-grout an interior existing brick wall. Face shell plugs should be adequately braced to resist fluid grout pressure. With the advent of self-consolidating grouts and other innovative consolidation techniques, this provision of the Specification has been very useful in demonstrating the effectiveness of alternate grouting procedures to the architect/engineer and building official. If each block has two voids then multiply the number of blocks by 2 to get the number of voids in the wall. This TEK covers methods for laying the units, placing steel reinforcement and grouting. Specification for Masonry Structures, ACI 530.1-02/ ASCE 6-02/TMS 602-02. Cover landscaping, grass or flooring with plastic drop cloths. Steel Reinforcement for Concrete Masonry. At flashing where reduced thickness units are used as shown in Figure 1, the exterior unit can be left out until after the masonry wall is laid up. Splices are not required to be tied, however tying is often used as a means to hold bars in place. (25 mm) below the top bed joint to help provide some mechanical keying action and water penetration resistance. This relationship assumes the wall shear strength is limited by shear through the mortar joints rather than shear through the units. Chip out the mortar, then brush away any additional dust or debris … A lift is the amount of grout placed in a single continuous operation. 3) requires a minimum opening dimension of 3 in. … Steel reinforcing bars and other embedded items are then placed in the designated locations and the cells are grouted. Spread the grout. It is important to reconsolidate after the initial absorption has taken place and before the grout loses its plasticity. Move any indoor or outdoor furniture away from the wall or cover it with plastic sheeting if it must remain near the wall. Noncontact lap splices may be spaced as far apart as one-fifth the required length of the lap but not more than 8 in. Typically called high-lift grouting within the industry, grouting with cleanouts permits the wall to be laid up to story height or to the maximum pour height shown in Table 1 prior to the installation of reinforcement and grout. (3,860 mm) under the following conditions: Through the use of a grout demonstration panel, lift heights in excess of the 12 ft-8 in. 3) is an excellent way to demonstrate the acceptability of an alternate grout slump. While the term is not found in codes or standards, it is common industry language to describe the process of constructing walls in shorter segments, without the requirements for cleanout openings, special concrete block shapes or equipment. Face shells are removed either by cutting or use of special scored units which permit easy removal of part of the face shell for cleanout openings (see Figure 5). Pump a fluid grout into the core in 2-foot lifts from the bottom. Matt Smolsky has been writing for more than 25 years. As the wall is constructed, horizontal reinforcement can be placed in bond beam or lintel units. The process involves applying a layer of cement over the concrete block wall to cover grout lines or stains and give the surface a smooth appearance. 6). Grind down parts of the concrete blocks if necessary, and then use a hammer and chisel to knock away anything remaining. Larger quantities should be placed by grout pumps, grout buckets equipped with chutes or other mechanical means designed to move large volumes of grout without segregation.