Masonry Magazine October 1976 Page. 13
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FIG. 1
Kansas; the site of the construction of several mid-rise loadbearing brick masonry dormitories and student apartments. Because of the size of the project and the fact that mortar, grout and concrete were to be site-mixed under strict controls of both the university and the state, the contractor used a leased weight-measuring and batching system. It is obvious that such a system, when operated by trained personnel, assures absolute control over mortar, grout and concrete.
Example 2.
Figure 2 illustrates a simpler approach with less control. The mortar batchman has the use of several 1-cu ft plywood boxes constructed at the site.
The procedure for determining the number of shovels full of sand was spelled out in the specification. The batchman was required to count the shovels full necessary to fill the boxes. This was performed at least twice a day-first thing in the morning and again after lunch. Better control could be obtained if the boxes were used for each batch.
Example 3.
Figure 3 illustrates a system using a concrete bucket on a pivot arm and post. With proper baffles for desired volume, the concrete bucket can be used for precise measurement of the sand required for each mixer full of mortar. The investment is relatively small in terms of the consistency obtained by this procedure.
Example 4.
Figure 4 shows a site constructed sand measuring tilt box for the mortar station at the site of a 15-story high-rise loadbearing brick masonry apartment structure in Reading. Pennsylvania. All the mortar batchman had to do was to fill the box with sand (9-cu ft volume), place it in the mixer, to which he added two bags of cement, one bag of lime and one measure of color additive for a carefully controlled Type S colored mortar.
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