Arizona republican., 1919-09-23
NOTICE INVITING PROPOSALS

Sealed propose Is will be received by the Highway Commission of Maricopa County at its office at Number North Seventeenth Avenue, Phoenix, Arizona, until the hour of 2 o'clock p. m. on the fourth day of October, 1919, for the furnishing to said Highway Commis- sion of the entire amount of coarse aggregate, according to the specified tions hereinafter set forth, and fine aggregate, according to the specified uons hereinafter set forth, that will be required to complete the construc- tion of the roads included in said Highway Commissions authorized road building program
 The Highway Commission estimates the amount of coarse aggregate that Will be required at Four Hundred Thousand (400,000) cubic yards, and the amount of fine aggregate that will be required at two hundred thousand (2OO,O00) cubic yards, but it is intended by this notice to invite bids for fur nishing all the coarse aggregate and all the fine aggregate that will be re- quired 70 complete the roads included in the said Highway Commissions authorized road building program. whether more or less than the above estimated amounts should be found to be required as the work progresses.
 Before delivery on the job, the con tractor shall submit to the said High way Commission fifty pound sample both of the fine and of the coarse ag- gregate proposed to be furnished pur- suant to his contract. These samples shall be tested and if found to pass the requirements of the specifications. material of equal quality shall be ac- cepted for the work.
 All aggregates used shall meet with the approval of said commission and shall fulfill the requirements of the following specifications:
 COARSE AGGREGATE: Coarse az gregate shall consist of clean, hard. or crushed gravel, graded in size, free from vegetable or other deleterious matter, and shall contain no soft, flat or elongated particles. The size of the coarse aggregate shall be such as to pass a two and one-half inch round opening and shall range from two and one-half t2h) inches diameter down, not more than five (5) per cent passing a screen having four (4 meshes per linear inch, and no inter- mediate sizes shall be removed.
 FINE AGGREGATE: Fine aggre- gate shall consist of natural sand or screenings from hard, tough, durable crushed rock or gravel, consisting of quartzite grains or other equally hard material graded from fine to coarse. with the coarse particles predominant ing. Fine aggregate when dry shall pass a screen having four (4) meshes per linear inch; not more than twenty five (25) per cent shall pass a sieve having fifty (50) meshes per linear inch and not more than five (5) per cent shall pass a sieve having one hundred (1O0) meshes per linear inch. Fine aggregate shall not contain vegetable or other deleterious matter nor more than three (S) per cent of clay or loam.
 Fine aggregate shall be of such quality that mortar composed of one CD part Portland cement and three ts) parts fine aggregate. by weight, when made into briquettes, shall show tensil strength at seven days, and twenty eight days. at least equal to the strength of briquettes composed of one CD part of the same cement and three (S) parts Standard Ottawa sand by weight. The percentage of water ooCo III lhohliAS tnc OI Ce- ment and fine aggregate shall be such as to produce a mortar of the same consistency as that of the Ot- tawa sand briquettes of standard con- sistency. In other respects all briquettes shall be made in accord ance with the methods outlined in the Standard Specifications and Tests of Portland Cement, adopted by the American Society for Testing Ma terials, September l, 1919, and subse- quent amendments.
 Successful bidders must guarantee delivery of at least two thousand (2.000) cubic yards per day, as re- quired by the highway commission. All prices quoted must be f. O. b. railway cars at Phoenix or Tempe, and must be written as well as ex- pressed in figures.
 All bids must be accompanied by a certified check for not less than ten | (10) per cent of the amount of the bid price for four hundred thousand cubic yards of the coarse and 200, ,00O cubic yards of the fine aggregates payable to the Treasurer of Maricopa County, said check to be retained y said county if the successful bidder refuses to enter into a contract in accordance with his bid
 The successful bidder will be re-
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