Masonry Magazine January 1968 Page. 50
new TARGET
TILE SAW
• bigger capacity
• lower cost
• greater value
TOLE SAW
HP
Model T-1075
10" Blade Capacity
1½ HP Model T-63
6 Blade Cap.
HP Model T-850
8 Blade Cap.
4 HP Model T-875
8 Blade Cap.
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BIGGER CAPACITY TARGET "tray" or "tub" style with a Model that makes one-pass cuts through 12"x 12 tile without tilting or forcing material without tub interference material stays solidly against free-moving conveyor cart.
COMPACT PRECISION
GREASED AND SEALED BALL BEARINGS High Quality, long-life bearings never need lubricating easily and quickly installed by hand without special tools. No maintenance! These-and many more features give you New Precision, Profit and Performance on Every Job.
New TILE SAWS are products of TARGET-World Leader in the Manufacture of MASONRY CONCRETE/ASPHALT and METAL CUT/OFF SAWS and BLADES FOR CONSTRUCTION AND INDUSTRY STOCKED AND SERVICED BY TARGET DISTRIBUTORS THROUGHOUT THE WORLD.
Robert G. Evans Co.
1000 WEST 25TH ST., KANSAS CITY, MO. 64108, U.S.A.
Phone 816-GRand 1-1020
Cold Weather Mortar Admixtures
(Continued from page 49)
Admixtures based upon calcium chloride will simply speed up the process of corrosion. Since metal and mortars, by their nature, will create galvanic currents that quickly corrode the metal, protective coats of quality paint or bituminous coatings are mandatory.
The mason's contribution is exerting proper care to ensure that such items are fully and solidly imbedded in the mortar. Fully imbedded steel or iron commonly used in masonry construction rarely is attacked by corrosion, even if calcium chloride or other accelerating admixtures are used.
COMPARATIVE COSTS
Unless a fair sized army of mortar and cement specialists have succeeded in deluding themselves, admixtures definitely have a place in masonry construction, and properly used, will more than pay for themselves. But the money you didn't lose is often hard to gauge, while the money you pay out for products and services often have a disheartening preciseness.
Cold weather construction costs are high enough now, when lowered output and heatings and enclosure costs are taken into account. What will admixtures add to this, and will that additional investment more than pay for itself?
The Structural Clay Products Institute has published some of the most pertinent and excellent articles on cold weather masonry available over the years. In the current specifications for cold weather work, SCPI points out the following considerations for Specifier:
*When temperatures drop below 40 degrees F., the temperature of the masonry when laid must be more than 40 degrees F.; this means the plastic mortar temperature must be kept close to 70 degrees F.
*After masonry has been laid, an air temperature of more than 40 degrees F. should be maintained for 48 hours for M and S mortars, and 72 hours for N mortars.
The latter recommendations assume the use of Type I Portland cement; SCPI notes that when Type III cement is used, the appropriate time periods the 40 degrees F.-plus temperature must be held may be reduced to 24 hours for M and S mortar, and to 48 hours for N mortars.
These dramatically different recommended heat-maintenance periods set the stage for an answer to our question about whether admixtures trim more off in costs than they add to expenses.
A quality accelerating admixture, in effect, transforms a Type I cement into a Type III cement, and since both the latter or a type I plus admixture will cut the period artificial heat must be supplied in half for M and S mortars and by 1/3 rd for N mortars, either one will reduce heating costs, allow enclosures to be moved sooner, and speed up production.
The choice between the two would then seem to turn upon their comparative cost, and the combined cost of (Continued on page 52)
masonry
January, 1968