MASONRY - Materials for Civil and Construction Engineers - page 318

8.12 A concrete masonry unit was tested according to ASTM C140 proce-
dure and produced the following results:

weight of unit as received
saturated weight of unit
oven-dry weight of unit

= 8271 g

= 8652 g

= 7781 g

For this unit, calculate (a) absorption in percent and (b) moisture
content as a percent of absorption
8.13 Define the nominal, specified (modular), and actual dimensions of
clay bricks.
8.14 State and define the three grades of clay bricks.
8.15 A severe weathering clay brick was tested for absorption and satura-
tion coefficient according to ASTM C67 procedure and produced
the following data:

dry weight of
saturated weight after 24-hour submersion in cold

specimen = 1.822 kg

water = 2.044 kg

saturated weight after 5-hour submersion in boiling

water = 2.060 kg.

Calculate absorption by 24-hour submersion, absorption by 5-hour
boiling, and saturation coefficient. Does the brick satisfy the ASTM
requirements?
8.16 What are the functions of mortar?

8.5 References

Adams, J. T. The Complete Concrete, Masonry and Brick Handbook . New
York: Arco, 1979.
Portland Cement Association. Mortars for Masonry Walls . Skokie, IL: Port-
land Cement Association, 1987.
Portland Cement Association. Masonry Information . Skokie, IL: Portland
Cement Association, 1991.
Somayaji, S. Civil Engineering Materials . Upper Saddle River, NJ: Prentice
Hall, 2001.