OCR Text |
Show Cement Mortar Preferred for Hollow Tile Work Hollow building tile should be set with cement mortar, composed by measure of one part Portland cement to not more than three parts clean sharp sand, to which there may be added hydrated lime not exceeding 15 per cent by volume of the cement. The percentage of lime added Is always figured on the quantity of the cement used; therefore, 15 per cent Is equal to about one-sixth pan by measure of the cement. The lime specified is not needed to make the mortar stronger, but to make it more plastic and easier to handle. Mortar containing lime will adhere better to the tile, makes a neater job and results in a saving in labor. Too much lime must not be used, as it weakens ihe mortar. A straight lime mortar, however rich the mixture, is not suitable for setting hollow tile. A sand containing a quantity of loam must not he used for cement, plastering or stucco. Sand containing a little clay may be used if the grains are not coated. |