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Grading Limits of Combined Aggregates <br /> Percentage Passim <br /> Sieve Sizes 37.5-mm Max. 25-mm Max. 12.5-mm Max. 9.5-mm Max. <br /> 50-mm 100 — — — <br /> 37.5-mm 90- 100 100 — — <br /> 25-mm 50-86 90- 100 — — <br /> 19-mm 45-75 55- 100 100 — <br /> 12.5-mm — — 90-100 100 <br /> 9.5-mm 38-55 45-75 55-86 50- 100 <br /> 4.75-mm 30-45 35-60 45-63 45-63 <br /> 2.36-mm 23-38 27-45 35-49 35-49 <br /> 1.18-mm 17-33 20-35 25-37 25-37 <br /> 600-gm 10-22 12-25 15-25 15-25 <br /> 300- m 4- 10 5- 15 5- 15 5 - 15 <br /> 150-gm 1 -6 1 -8 1 -8 1 -8 <br /> 75-gm 0-3 0-4 0-4 0-4 <br /> • Changes from one grading to another shall not be made during the progress of the work unless permitted by the <br /> Engineer. <br /> 904 ADMIXTURES <br /> 904.01 GENERAL <br /> • Admixtures used in portland cement concrete shall conform to and be used in conformance with the provisions in <br /> this Section 90-4 and the special provisions. Admixtures shall be used when specified or ordered by the Engineer and may be <br /> used at the Contractor's option as provided herein. <br /> • Chemical admixtures and air-entraining admixtures containing chlorides as Cl in excess of one percent by mass of <br /> admixture,as determined by California Test 415,shall not be used. <br /> • Admixtures shall be uniform in properties throughout their use in the work. Should it be found that an admixture as <br /> furnished is not uniform in properties,its use shall be discontinued. <br /> • If more than one admixture is used, the admixtures shall be compatible with each other so that the desirable effects <br /> of all admixtures used will be realized. <br /> • Chemical admixtures shall be used in conformance with the manufacturer's written recommendations. <br /> 90-4.02 MATERIALS <br /> • Admixture materials shall conform to the provisions in Section 90-2.04,"Admixture Materials." <br /> 904.03 ADMIXTURE APPROVAL <br /> • No admixture brand shall be used in the work unless it is on the Department's current list of approved brands for the <br /> type of admixture involved. <br /> • Admixture brands will be considered for addition to the approved list if the manufacturer of the admixture submits <br /> to the Transportation Laboratory a sample of the admixture accompanied by certified test results demonstrating that the <br /> admixture complies with the requirements in the appropriate ASTM Designation and these specifications. The sample shall <br /> be sufficient to permit performance of all required tests. Approval of admixture brands will be dependent upon a <br /> determination as to compliance with the requirements, based on the certified test results submitted, together with tests the <br /> Department may elect to perform. <br /> • If the Contractor proposes to use an admixture of a brand and type on the current list of approved admixture brands, <br /> the Contractor shall furnish a Certificate of Compliance from the manufacturer,as provided in Section 6-1.07,"Certificates of <br /> Compliance," certifying that the admixture furnished is the same as that previously approved. If a previously approved <br /> admixture is not accompanied by a Certificate of Compliance,the admixture shall not be used in the work until the Engineer <br /> has had sufficient time to make the appropriate tests and has approved the admixture for use. The Engineer may take samples <br /> for testing at any time,whether or not the admixture has been accompanied by a Certificate of Compliance. <br /> 904.04 REQUIRED USE OF CHEMICAL ADMIXTURES <br /> • If the use of a chemical admixture is specified,the admixture shall be used at the dosage specified, except that if no <br /> dosage is specified,the admixture shall be used at the dosage normally recommended by the manufacturer of the admixture. <br /> Contract No. 10-OM7104 <br /> 77 <br />