Document QJyzZ4xEdjRQNEmdQwrd1DqNo

concrete stave silos stowage tanks COAL POCKETS GRAIN BINS CONCRETE MASONRY UNITS May 8, 1982 BLOOMFIELD INDIANA WORTHINGTON. INDIANA Charlotte. Michigan WHITE MARSH MARYLAND MASSILLON. OHIO MONTEACLC. TENNESSEE . Mr. J. K. Carlson Concrete Silo Company P. 0. Box 798 Monteagle, Tennessee ; . Dear Howie": I an writing you about one item I failed to conent on, substituting fine silica for clay. I can not find anything in b) papers concerning this. In fact, no mention was made of a filler at first. There ay be an advantage in using fine silica sand inasmuch as silica is a weak acid which might combine with the lime stone found in most surfaces that are deteriorating. It might even combine with ,, the remnant of cement found on the inside of a silo that is wearing and deteriorating. The question you will have to decide is whether the "Cumar" when prepared with silica sand will stay in solution as readily as when it is made with clay. For the present we do Dot intend to make change as our formulation is very satisfactory. For instance the outside coating on the Svitz City grain bins is as good today as it was when applied, which was seven years ago. Their are not many paints that will show that much resistance to weather. Evidently our paint vehicle is effective just as made at this time, however, I will be glad to have vuu experiment using silica sand in place of clay. The clay is essentially a combination of silica and aluminum, therefore quite neutral. Very truly yours VB/mv Valter Braasert DSW 441105 STLCOPCB4102611