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Reinforced Block Walls

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Figure 8-28.-Masonry wall horizontal joint reinforcement. Both piers and pilasters are used to support heavy, concentrated  vertical  roof  or  floor  loads.  They  also provide  lateral  support  to  the  walls.  Piers  and pilasters offer an economic advantage by permitting construction of higher and thinner walls. They may be  constructed  of  special  concrete  masonry  units (figure 8-27) or standard units. REINFORCED   BLOCKWALLS Block  walls  may  be  reinforced  vertically  or horizontally.  To  reinforce  verdically,  place  reinforcing rods  (called  rebar)  into  the  cores  at  the  specified spacing and till the cores with a relatively high-slump concrete. Rebar should be placed at each corner and at troth sides of each opening. Vertical rebar should be spaced a maximum of 32 inches on center in walls. Where  splices  are  required,  the  bars  should  be  lapped 40  times  the  bar  diameter.  The  concrete  should  be placed  in  one  continuous  pour  from  foundation  to plate line. A cleanout block maybe placed in the first course  at  every  rebar  stud  for  cleaning  out  excess mortar and to ensure proper alignment and laps of rebars. Practical   experience   indicates   that   control   of cracking  and  wall  flexibility  can  be  achieved  with  the use  of  horizontal  joint  reinforcing.  The  amount  of joint reinforcement depends largely upon the type of construction. Horizontal  joint  reinforcing,  where required, should consist of not less than two deformed longitudinal No. 9 or heavier cold-drawn steel wires. Truss-type  cross  wires  should  be  1/8-inch  diameter  (or heavier) of the same quality. Figure 8-28 shows joint reinforcement   on   16-inch   vertical   spacing.   The location and details of bond beams, control joints, and joint  reinforcing  should  all  be  shown  on  the  drawings. PATCHING AND CLEANING BLOCK WALLS Always fill holes made by nails or line pins with fresh mortar and patch mortar joints. When laying concrete  masonry  walls,  be  careful  not  to  smear mortar on the block surfaces. Once they harden, these smears cannot be removed, even with an acid 8-23



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