Masonry Magazine January 1966 Page. 44
46
The broad expanse of masonry on the New York State Electric & Gas Corporation building near Ithaca, New York presented no cleaning problem for Sure Klean 600 Detergent. Sure Klean was in keeping with the modern architectural design of Gilbert Associates, Inc., Reading, Pa, Engineers and Consultants. Frommeyer & Co., Philadelphia were the Masonry Contractors.
SURE KLEAN 600
A SOLUTION LOOKING FOR A PROBLEM
Sure Klean 600 Detergent is the ideal solution for removing excess mortar from any masonry surface. It's best because it
CLEANS MASONRY FASTER
Its specially formulated "wetting" action penetrates around and under mortar deposits quickly to cut your man-hour costs. Easy to apply, too. Just brush on, let stand briefly then rinse with cold water.
CLEANS MASONRY BETTER
The fast cleaning action gets deep down under the deposits without danger of burn, stain or discoloration even on Buff Brick. Safer to use, too.
CLEANS MASONRY AT LESS COST
Sure Klean reduces labor and material handling costs up to 50%. Concentrated to save on shipping and storing costs. Solution can be varied to fit specific jobs.
SEE US AT MCAA CONVENTION BOOTH 30
1040 CHELSEA TRAFFICWAY
P. O. BOX 437 913 MA 1-0244
KANSAS CITY, KANSAS 66104
THE PROCESS SOLVENT CO., INC.
(5844)
Admixtures for All-Weather Construction
(continued from page 45)
9) Damp-proofing and permeability-reducing admixtures.
10) Bonding admixtures.
11) Chemical admixtures to reduce alkali-aggregate expansion.
12) Corrosion inhibiting admixtures.
13) Fungicidal, germicidal, and insecticidal admixtures.
14) Flocculating admixtures.
15) Coloring admixtures.
Commercial admixtures may contain materials of two or more of the above group. For example, a workability agent which may be combined with an accelerator to compensate for the retarding action.
I would now like to discuss the two admixtures most prominently used by masonry contractors, calcium chloride and air-entraining agents.
ACCELERATORS
Accelerators may be added to concrete to increase the rate of early strength development in concrete for various reasons. Chemical materials which accelerate the normal reaction between portland cement and water include calcium chloride (the most commonly used accelerator) some of the soluble carbonates, silicates and fluosilicates aluminous cements and some organic compounds such as triethanolamine. Accelerators such as the fluosilicates and triethanolamine can be pronounced-0.2 percent added to some cements can produce a flash set. General recommendations on the use of accelerators other than calcium chloride are difficult to give on the basis of present information. In general the recommendations are that they should only be used on the basis of competent technical advice and preliminary tests, with the particular cements in question.
CALCIUM CHLORIDE
As stated above, calcium chloride is the most commonly used accelerator. The addition of recommended quantities of calcium chloride to portland cement mixes produces certain measurable results. It will make good concrete better, but will not make good concrete out of bad. The use of calcium chloride and the results obtainable have been the subject of much study. The first known reference to its use is contained in a patent issued in England in 1885. Since that time there has been a great deal of research at such agencies as the National Bureau of Standards, Ohio State University, the Bureau of Reclamation and the Portland Cement Association.
The effects of calcium chloride on portland cement and masonry mortar are; first, it accelerates the set; secondly, it provides high early strength; third, it shortens the curing period, and, fourth, it is a valuable aid in cold weather concreting.
To elaborate on these points, the first noticeable effect of calcium chloride is the reduction in time required for initial set. By varying the quantities of calcium chloride from 0 to 2 percent by weight of cement the average time of initial set can be reduced from approximately three hours to one hour under normal conditions, and the time of final set from six hours to two hours. At lower temperatures the actual time of set will be slower but the effect of the addition of calcium chloride on the time of set will be even more pronounced. Translated to practical terms this means that concrete products reach design strength faster, poured slabs may be finished sooner and work in general on concrete construction can proceed at a more rapid rate.
MASONRY January, 196