Masonry Magazine October 1994 Page. 31
During inclement cold weather, expedited closure of the structure by erecting the inner wythe as rapidly as possible can be beneficial, especially to other trades.
The dry blend mixer receives water additions initially during auger mixing. The dry sand requires production of masonry mortar sufficiently wet to remain workable after sand absorption is satisfied, else tempering will be required before use. Mortar temperature is not easily controlled. Heated or chilled water can be pumped to the throat of the auger, providing some temperature control. The concept of heating the combined mortar ingredients in the silo have been explored but remain a concern.
During cold weather and dependent on the ambient temperature, materials will have to be heated to produce mortar within the proper temperature range. Heated water is most effective in raising mortar temperature. For safety reasons, water should not be heated above 140°F. Heated sand then become the second option available to produce mortar in the desired temperature range. Sand should be heated, while avoiding scorching the sand. Since most sands used for masonry construction are siliceous, the reduction of limestone to quicklime is a caution solely applicable to manufactured sands.
During hot weather maintaining the mortar temperature may be required. Sand in stockpiles should be maintained moist. Chilled water can be required. Evaporative cooling of sand in a stockpile is only partially effective. Adjusting the workday toward earlier arrivals and departures avoids the hot portion of the day.
All should avoid calculating the expected mortar temperature basing the calculations on temperature and specific heat characteristics of individual masonry mortar materials. The temperature of the mixer will significantly influence the temperature of the mixture. The mixer will act as a cold or heat sink. Thus serious consideration should be directed toward maintaining the mixer well below prevailing temperature.
Scaffolding-access to working face Dependent on the masonry project, several options are available for masonry construction. A specific project can allow overhand construction, with minimal scaffolding provided on concrete slabs or floors. Movable scaffolding platforms rising full structure height require installation on the exterior. Construction may involve laying the exterior wythe singly or through-the-wall construction. Consideration also must be directed toward masonry accessories and joint reinforcement type.
During inclement cold weather, expedited closure of the structure by erecting the inner wythe as rapidly as possible can be beneficial, especially to other trades. Awaiting more favor-
THE MASON'S CHOICE IS PRODUCTIVITY, AFFORDABILITY & LESS LABOR
HIGH-SPEED SCAFFOLDING
* INCREASE PRODUCTION 20-35%
Keep masons working at most productive level all day.
No stopping to move mason's brackets and planks.
Provide masons with better visibility of work being performed.
Eliminates stooping down or reaching up for materials.
* REDUCE SCAFFOLD LABOR COSTS 80%
Build only once on the job and move with forklifts.
No moving of safety rails or unused material to next level.
Towers can be extended without interfering with the masons working.
* STRONG
Winch and pulley reduces the force necessary to raise full pallets of block or brick by 75.6%.
* WEATHER PROTECTION
Various field-tested styles available for all weather conditions: top mounted (like a tent) to climbing enclosures which could cut heating costs by 60%.
CALL OR WRITE FOR YOUR FREE VIDEO
To maximize your bottom line profits, Mighty invites you to attend workshops offered in Nashville and will job-site train your personnel.
MIGHTY
491 Allied Drive
Nashville, TN 37211
EQUIPMENT COMPANY (615) 834-2120 (800) 859-2120
MASONRY-SEPTEMBER/OCTOBER, 1994 31