Preparation of Masonry Cements and Test Results (II)

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In previons report (Gypsun & Lime No. 34, 16-23 1958), we concluded that a mixture of 30 to 40% of portland cement, 50 to 60 % of fine ground limestone and about 5% of Keisan-hakudo powder gives good results in practice. We present here some test results on masonry cements prepared using materials such as "perlite" and "asbestos tailing". From the fundamental tests, we picked 5 kinds of cements out of 23 samples made in combination of portland cement, mixture of limestone (90 parts) and Keisan-hakudo (10 parts), serpentine, perlite, asbestos tailing, and fly ash. Then, we applied these cements to adhesion tests and practical plastering works. A mixture of portland cement, limestone, perlite and asbestos tailing (30 : 30 : 30 : 10) gave the best results in workability and tint. Admixing of fly ash shows no the properties, but it brings some darkness in the cement. So this will suite for undercoating mortar or out side final coating. The quality of this kind of cement is between gypsum plaster and dolomitic plaster, but the best in abrasion resistability, which means posibility of washing and brushing. The amount of portland cement to be mixed is thought to be enough in about 20%.
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