1925 (#1403-1607) - Laserfiche WebLink

Home Browse Search

~TION 4. MIXING FINISH MORTAR. The mortar shall be mixed in a concrete mixer in the manner specified for concrete, or in a water-tight mixing bolt When a mixin~ box is used, the box shall be first filled approximately one-half (~i) full of sand, the volume of which has been previously deter- mined with a one (1) cubic foot measuring box. The sand shall be rodded off with a guage which shall be used for guaglng each subsequent batch. The requisite number of sacks of cement shall then be added. The inspector shall be given an opportunity to check the number of sacks of cement used in each batch. The material shall then be dry mixed by turning at least three ($) times with a mortar hoe. Sufficient water shall then be added and mixing continued until the batch is uniform in color and consistency. The mortar must be used immediately after mixing and no retempering will be permitted. Curb, Gutter and Sidewalk Construction. S~CTION 1. CRM~NT CURB CONSTRUCTION. Cement curb shall be placed upon a subgrade prepared as hereinbefore described. (a) DIMENSIONS. All cement curbs shall be five (5) inches wide at the top, seven and one-half (?~) inches wide at the bottom, and sixteen (16) inches in depth, having a batter o ftwo and one-half (2~) inches on the front face, unless otherwise noted on the plans or other standard drawings on file in the office of the City l~n~neer. (b) FORMS. Forms shall be of a width equal to the the full depth oi the curb, and for straight curbs shall be two (2) inches thick if of wood. Warped forms and forms not having a smooth straight upper edge shall not be used. Front and back forms shall always be used. Rigid outside forms shall be provided for curb returns having radii of two (2), three (3), or eight (8) fee~, Benders or thin plak forms, rigidly placed, may be used for curb returns having a radius not specified above and for curb on any other curves. All curb forms must BO carefully set to proper alignment and grades. The curb forms shall be rigidly held in place by the use of not less than five (5) pairs of iron stakes to each twenty (20) ioot section of curb, and other sections in proportion. When wooden stakes are used, they shall be at least two (2) inches by two 20 inches in cross-sections, or equivalent~ thereto in stren~'th, ami for each twenty (20) foot section of curb, there shall be not less than seven (7) pairs of stakes. Clamps, spreaders, and braces shall be freely used where required. Before resetting forms that have been previously used, all mortar, dirt, nails, etc., shall be removed. The total len~,,th ot the curb forms provided shall be not less than one-third (1-3) of the Icu~,th of the curb constructed in one (1) day. Curb torres shall not be removed from the concrete in less than one-half (~) hour after the concrete has been tamped into place. (c) PLACING CONCRBTI~. The subgrade and iorms shall be thoroughly sprinkled with water before placin~ any concrete, The concrete shall be placed in the forms in layers not more than six (6) inches in depth and each layer shall be tamped until the (d~ I'I~A~TI!iKING ,M~D ~II~II~[-IIRC~. A.s a~t a~ t~ae cuuc~te h~ b~cu 'churuughly tamped, the top oi the curb shall be plastered with a one-half (~) inch coat of finished oi the curb shall receiYe a ooe-iourth (~) inch coat oi this mortar, to a depth oi not less than two (~) inches below the ~uttcr lln~, but in no case to a total depth of less than twelve (12) inches. The back of the ucrb shall be treated in like manner to a depth of approximately four (4) inches. The plastered surface of thc curb shall be well floated and troweled into the body of the curb before the concrete has set. It shall be smoothly polished and marked with ioints at ri~'nt angles to the curb hue, into blocks of uniform len~h, not less than two a~d one-iourth (2~) feet, nor more than three {nd one-half feet. The marks shall coincide with the construction ioints. The front edge of the top