﻿VITKIFIED BliICK AS MATElilAL FOE COUNTRY ROADS. 25 



which arc soft, badly spalled, misshapen, or otherwise defective slaall 

 be removed and replaced with perfect brick. Kiln-marked brick may 

 be turned over, and if the reverse edge is smooth and no other fault is 

 found, they may remain in the pavement. 



The above provision for correcting defects shall not be understood 

 to relieve the contractor from exercising every reasonable precaution 

 to see that only satisfactory brick are correctly placed in the pave- 

 ment when it is first laid. 



After the brick have been laid and inspected as above provided, 

 they shall be brought to a true surface by means of rolling and tamping. 

 The rolling shall be done with a power roller weighing not less* than 

 3 tons nor more than 5 tons and the pavement shall be rolled in both 

 longitudinal and transverse directions. The longitudinal rolling 

 shall begin- at the curbs and progress toward the center. The roller 

 shall in all cases cover exactly the same area in making its backward 

 trip which was covered in its forward trip, and shall proceed at a very 

 slow rate until the entire pavement has received the first rolling. 

 The longitudinal rolling shall continue until the brick have been 

 brought to a true surface and are firmly embedded in the sand 

 cushion. The pavement shall then be thoroughly rolled transversely 

 at an angle of 45 degrees with the curb in both directions. Careful 

 inspections shall be made after boili the longitudinal and transverse 

 rollings, and all broken or otherwise injured brick shall be removed 

 and replaced to the satisfaction of the engineer. 



The brick next to the curb and at other points not readily accessible 

 to the roller shall be brought to a true surface by means of ramming 

 with a hand rammer made of wood and loaded to weigh not less than 

 80 pounds. The blows of the rammer shall be transmitted through a 

 2-inch board not less than 5 feet long. 



Fillin g the joints. — The filler shall consist of a grout composed of 

 equal parts of Portland cement and sand, and shall be applied in 

 two coats. The cement shall conform to the specifications herein- 

 before given for Portland cement. The sand shall also conform to 

 the specification contained herein for sand to be used in concrete, 

 except that the largest grains shall be required to pass a |-inch mesh 

 screen instead of a |-inch mesh screen. 



The grout shall be mixed in small batches and not more than one 

 sack of cement to one batch shall be mixed at any one time. The 

 sand and cement shall be thoroughly mixed dry until the mass assumes 

 an even shade of color. Sufficient clean water shall then be admixed 

 to produce a consistency about equal to that of thin cream for the 

 first application, and slightly thicker for the second application. 

 The materials shall be mixed in suitable boxes, which have been 

 approved by the engineer. The legs of each box shall have different 

 lengths, so that the mixture will readily flow to the lowest corner of 



