Repository: UIHistories Project: Board of Trustees Minutes - 1932 [PAGE 417]

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193']

U N I V E R S I T Y O F ILLINOIS

415

W e are prepared to begin construction work within ten days and to complete the construction within fifteen working days. Very truly yours, LEHIGH STONE CO. by G. A. Brown SUPPLEMENTAL SPECIFICATION TO PROPOSAL SUBMITTED A U G U S T 24, 1931 Construction of Pavement on University of Illinois Drives Construction of Macadam Foundation Course: After the sub-grade has been thoroughly rolled a layer of crushed stone graded from 3' stone down to iyi" stone shall be spread upon the sub-grade by means of a stone spreader. Stone screenings graded in size from yi" stone down to stone dust shall then be spread upon the layer of large stone. These screenings shall be spread in such quantity per square yard so as to fill the voids and interstices in the large stone. The foundation course shall then be rolled with a ten-ton three-wheeled roller until the foundation course is completely locked, keyed and compacted. More stone screenings shall be added to f l any and all voids developed in this rolling. T h e il foundation course shall then be rolled again so that no loose material is left on the surface. Water shall be used during this entire construction so as to keep the stone screenings wet so as to secure a water binding of the entire mass. Construction of Bituminous Coated Aggregate Wearing Surface: After the foundation course has been completed it shall receive a prime coat of asphalt applied by means of an asphalt distributor; $4 of a gallon of asphalt per sq. yd. This quantity however shall be increased if it is found ^ of a gallon is not priming the foundation completely. A layer of crushed stone coated with asphalt; every stone to be completely coated by means of a mixing or pre-coating machine; shall be spread by means of a spreader to the specified thickness. This layer of asphalt coated stone shall be graded in size from 1 yi" stone down to yi' stone. After this layer of coated stone has been evenly and uniformly spread, asphalt coated stone chips graded in size from yi" chips down to yi" chips shall be spread over thefirstlayer of coated stone and the entire mass shall then be rolled with a ten-ton, three-wheeled roller until the surface wearing course is completely compacted to the specified depth and the entire surface is locked and keyed. Coated stone chips shall be added and rolled to fill all voids that appear in the first rolling. The surface course shall then be straight-edged to meet a m a x i m u m variation of yi" in 2o'o' and coated stone chips shall be applied and rolled to correct any variations in the surface. A seal coat of asphalt shall then be applied by means of an asphalt distributor, }i gallon per square yard, and a good grade of torpedo sand spread upon this seal coat. The surface shall then be completely rolled so as to seal the entire wearing surface and make the same water-tight. The above work will require the use of the following equipment at the site of the work: Pre-Coat Machine Emulsifying Machine for the asphalt Heating Machine for the asphalt Unloading conveyor for the stone Stone spreader Ten-Ton Three-Wheel Roller Tractor and blade W e will be pleased to furnish a three-year maintenance bond on all those pavements where a 2* compacted top is placed. LEHIGHAugust 26,CO. by G. STONE 1931 A. Brown