. Engineering and Contracting. when dry a screenhaving V^-vn. diameter holes, shall be prefer-ably of silicious materials, clean, coarse, freefrom vegetable loam or other deleterious •Committee report presented at the Feb. 21-24, 1910, convention of the National Associationot Cement Users. matter, and not more than G per cent shall passa sieve having 100 meshes per linear inch. Mortars composed of 1 part Portland cem-ent and 3 parts fine aggregate by weight whenmade into briquets shall show a tensilestrength of at least 70 per cent of the strengthof 1:3 mortar of the same consistency madewith
. Engineering and Contracting. when dry a screenhaving V^-vn. diameter holes, shall be prefer-ably of silicious materials, clean, coarse, freefrom vegetable loam or other deleterious •Committee report presented at the Feb. 21-24, 1910, convention of the National Associationot Cement Users. matter, and not more than G per cent shall passa sieve having 100 meshes per linear inch. Mortars composed of 1 part Portland cem-ent and 3 parts fine aggregate by weight whenmade into briquets shall show a tensilestrength of at least 70 per cent of the strengthof 1:3 mortar of the same consistency madewith the same cement and standard Ottawasand. Coarse Aggregate shall consist of inert ma-terial, graded in size, such as crushed stone orgravel, which is retained on a screen having^-in. diameter holes, shall not exceed in thelargest dimension one-half the wall thicknessof the tile and shall be clean, hard, durable,and free from all deleterious materials. Ag-gregates containing soft, fiat or elongatedparticles shall be Fig. 4—View of Slab Yard. 168 ENGINEERING-CONTRACTING Vol. XXXIII. No. S. Water shall be clean, free from oil, acid,strong alkalies, or vegetable matter. PROPORTIONS. A bag of Portland cement weighing 94 be considered as 1 cu. ft. All concreteshall be prepared and mixed in quantities re-quiring one or more full bags of cement, andthe use of any device for mechanically propor-tioning the materials is prohibited. Machine Made Tile, 8 ins. and less in di-ameter. Tile in sizes up to 8 ins. in diametershall be made of a of 1 part of cem-ent to not more than 4 parts of fine aggregate(l:-4). 10 to 16 ins. diameter. Tile from 10 to 16 tight platform and the materials shall beturned until they are homogeneous in ap-pearance and color. d. Consistency. Machine Made Tile. Formachine made tile the concrete shall be as wetas can be used and allow the immediate re-moval of the jackets. The concrete must beused within 20 mins. after the time it is mi
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