Masonry Magazine July 1974 Page. 19
NCMA-TEK
An Information series from National Concrete Masonry Association
Reinforced Concrete
Masonry Construction
59
TABLE I-MORTAR PROPORTIONS BY VOLUME
| Mortar Type | Parts by Volume of Portland Cement or Portland Blast-Furnace Slag Cement | Parts by Volume of Masonry Cement | Parts by Volume of Hydrated Lime or Lime Putty | Fine Aggregate Measured in a Damp, Loose Condition |
|---|---|---|---|---|
| PM | 1 | 1 | | 2½ to 3 times the sum of the volumes of the cementitious materials. |
| PL | 1 | | ¼ to ½ | |
TABLE 11-GROUT PROPORTIONS BY VOLUME
| Type | Parts by Volume of Portland Cement or Portland Blast-Furnace Slag Cement | Parts by Volume of Hydrated Lime or Lime Putty | Aggregate, Measured in a Damp, Loose Condition |
|---|---|---|---|
| | | | Fine | Coarse |
| Fine grout | 1 | 0 to 1/10 | 2½ to 3 times the sum of the volumes of the cementitious materials | |
| Coarse grout | 1 | 0 to 1/10 | 2½ to 3 times the sum of the volumes of the cementitious materials | 1 to 2 times the sum of the volumes of the cementitious materials |
TABLE III-ESTIMATED VOLUME OF GROUT* NEEDED FOR 8"
REINFORCED HOLLOW UNIT CONCRETE MASONRY WALLS-CUBIC
FEET PER 100 SQUARE FEET OF WALL
| BOND BEAMS | BLOCK CELLS GROUTED EVERY: | FULL GROUT |
|---|---|---|---|---|---|---|
| | 48" | 40" | 32" | 24" | 16" | |
| none | 5% | 6% | 8½ | 11 | 16½ | 33 |
| 8 ft. apart | 8 | 9 | 10 | 13 | 18 | 33 |
| 4 ft. apart | 10 | 11 | 12½ | 14½ | 19 | 33 |
| 2ft. apart | 14½ | 15% | 16½ | 19 | 22 | 33 |
*includes 10% allowance for waste
NOTE: to estimate grout needed for other unit thickness, multiply above figures by:
0.63 for 6" hollow units, or 1.55 for 12" hollow units.
TEK 59 © National Concrete Masonry Association
Introduction
Reinforced concrete masonry consists of concrete masonry in which steel reinforcement is embedded and so placed that the masonry will have greatly increased resistance to applied loads and forces. Originally developed for use in areas subject to earthquakes, reinforced concrete masonry is now finding wide application-in multi- storied bearing wall buildings, retain- ing walls, basement walls, beams and lintels-where there is a need for struc- tural properties that may not be economically obtained with non- reinforced concrete masonry construc- tion. Since reinforced concrete mason- ry is a method of construction in which concrete block, mortar, grout and steel must act together, it is par- ticularly important that the recom- mendations given herein be followed to provide safe and satisfactory con- struction.
Materials
Concrete Masonry
Units.
Concrete masonry units for reinforced concrete masonry construction should comply with the requirements of the following ASTM specifications:
Hollow Load-Bearing Units - (ASTM C 90)
Solid Load-Bearing Units - (ASTM C 145)