CONSTRUCTION NOTES 329 



or pebbles one and one-half inches or smaller, and each section to harden 

 before forms are moved and adjoining sections placed. Slabs to be rein- 

 forced with welded square mesh cold drawn steel fabric made of No. 10 

 wire on six-inch centers with effective sectional areas in both directions 

 of .029 square inch of steel per foot of fabric and the effective weight per 

 100 square feet to be not less than 20.7 pounds. This fabric to be placed 

 lengthwise of court sections and slightly pressed into concrete base imme- 

 diately after base is placed, without crossing joints. Fabric to be not less 

 than one and one-fourth inches from finished surface of court. 



WEARING COURSE 



Proportions. The mortar shall be mixed in the pro- to the established grade by means of a strikeboard, it 



portions of one sack of cement to one cubic foot of shall be worked with a wood float in a manner which 



sand, one cubic foot of granite screenings, one-half will thoroughly compact it and produce a surface free 



pound of Trimount Germantown lampblack or Iowa from depressions or inequalities of any kind. The sur- 



Paint Manufacturing Company's carbon black mortar face shall be steel troweled, but excessive working shall 



color and two pounds of Iowa Paint Manufacturing be avoided. 

 Company's or Ricketson's red mortar color. Protection from weather. The concrete surface must 



Consistency. The mortar shall be of the dryest con- not be damaged or pitted by rain drops, and therefore 



sistency possible to work with a sawing motion of the the contractor shall provide and use, when necessary, 



strikeboard. sufficient tarpaulins to completely cover all sections that 



Thickness. The wearing course of the court shall have have been placed within the preceding twelve hours, 

 a minimum thickness of one and one-quarter inches. Treatment. As soon as each finished court section has 



Placing. The wearing course shall be placed imme- hardened sufficiently to prevent damage thereby, the 



diately after mixing. It shall be deposited on the fresh surface shall be covered with at least one inch of wet 



concrete of the base before the latter has appreciably sand, or two inches of wet sawdust, which shall be kept 



hardened and brought to the established grade with a wet by sprinkling with water for at least ten days, 

 strikeboard. In no case shall more than forty-five min- Court lines. The necessary court line shall be one and 



utes elapse between the time the concrete for the base one-half inches in width and shall be marked as indi- 



has been mixed and the time the wearing course is cated. All lines shall be formed by painting with two 



placed. coats of concrete paint. 



Finishing. After the wearing course has been brought 



Concrete courts in Pasadena, California. The following specifications 

 were used by the Pasadena Park Department in constructing a 60 x 120- 

 foot concrete tennis court. Attention is called to the use of lampblack in 

 the surface finish. 



Grading. The subgrade should be brought to as near a perfect plane 

 surface as is reasonably possible in locations where there is no frost, and 

 then a layer of sand one inch thick placed upon this surface and in turn 

 the concrete base placed upon this sand. 



In locations where there is frost the ground should be excavated to a 

 depth of nine inches and the excavation filled with four inches of one and 

 one-half-inch crushed rock, three inches of one-inch crushed rock, one inch 

 of pea gravel and one inch of sand. Proper drains should be placed in order 

 that no water can accumulate and freeze in the crushed rock. The sand 

 should be brought to a plane surface, as in non-freezing territory. 



Grade. The grade of a concrete tennis court should be .05 foot per 

 12-foot bay. The slope may be entirely from one end or from the middle 

 toward each end. The latter slope is preferable when the topography will 

 permit it. 



