﻿VITRIFIED BRICK AS MATERIAL FOR COUNTRY ROADS. 21 



determined in several instances, but have usually been so small as 



to make the probable terms of service appear almost indefinite. It 

 is evident, however, that in order to secure the full benefit of this 

 excellent resistance to wear the surface of the pavement must not be 

 permitted to become uneven because of the failure of isolated bricks. 



TYPICAL SPECIFICATIONS FOR THE CONSTRUCTION OF BRICK ROADS. 



Engineer. — The term "engineer," as hereinafter employed, shall 

 be understood to mean the engineer authorized by the officials 

 legally responsible for the proposed improvement. The engineer 

 will furnish all lines and grades, set all necessary stakes, and furnish 

 estimates of the work done upon which to base both partial and 

 final payments. All instructions necessary to give effect to any 

 part of these specifications will be furnished by the engineer, and his 

 decision concerning all matters herein left to his judgment shall be 

 final and conclusive. 



Plans and drawings. — All plans and drawings furnished by the 

 engineer which show the general location, profile, details, and dimen- 

 sions of the proposed road are hereby made a part of these specifica- 

 tions, and the work shall in all respects conform to these plans and 

 drawings, except that such modifications as in the judgment of the 

 engineer are made necessary by the exigencies of construction may 

 be made from time to time. On all drawings figured dimensions are 

 to govern in cases of discrepancy between scale and figures. 



Grading and subgrade. — All rubbish, stumps, trees, and other 

 encumbrances which occur on the line of the work shall be removed 

 by the contractor at his own expense. 



The roadbed shall be graded to conform to the lines, cross sections, 

 and grades furnished by the engineer. Embankments shall be con- 

 structed of a good quality of soil or other material satisfactory to the 

 engineer. They shall be built up in layers not exceeding 12 inches 

 in thickness, and each layer shall be thoroughly compacted by means 

 of a roller weighing not less than 10 tons, or by some other means 

 which the engineer has previously approved. 



All soft, spongy, or otherwise objectionable material encountered 

 in preparing the subgrade shall be removed and replaced by other 

 material satisfactory to the engineer. In excavating the contractor 

 shall exercise care not to disturb any material lying beneath the sub- 

 grade, as shown on the drawings furnished by the engineer, except 

 in removing objectionable material as above provided. 



The entire subgrade shall be rolled with a roller weighing not less 

 than 10 tons, and when complete shall be firm and hard. It shall 

 conform in cross section to the proposed surface of the finished road- 

 way and be at the required depth below it. 



