506.3(u) 506.4(a) two cylinders, made from the same sample, tested according to PTM No. 604, will constitute the 28- day compressive strength. Cure test specimens according to Subsection 1 2.1 of PTM No. 611. The result of one sample of concrete obtained and tested according to AASHTO T 152 for stone and gravel, or AASHTO T 196 for slag coarse aggregate, will constitute the percentage of air content. The Representative will accept concrete based on the adequacy and uniformity of compressive strength at the age of 28 days, and, with respect to the air content, when the PWL is 55% or greater. Calculate the value of Q by one of the following equations, where X4 is the average of the sublot test results. Q L is the lower quality index and Q U is the upper quality index. “s” is the Standard Deviation as specified in Section 106.03(a)3.a.4.
2.a For Class AA 28- day concrete compressive strength,
QL=X�4−3,300psi s
2.b For percentage of air content of Class AA concrete,
QL=X�4−5.0% s and QU=8.5%−X�4 s
Determine the percentage of material within specification limits as specified in Section 106.03(a)3.
506.4MEASUREMENT AND PAYMENT —Square Yard
The Department will pay on a lot -by-lot basis at the contract price, adjusted for pavement characteristics relative to depth, compressive strength, and air content. The lot payment will be determined according to the multiple characteristic formula as specified in Section 506.4(a)3.
percentage for depth will be determined using Table A. The characteristic percentage for depth (Pd) will be placed in the multiple characteristic formula as specified in Section 506.4(a)3 to determine the lot payment.
by using Table B. The characteristic percentage for compressive strength (Ps) and the characteristic percentage for air content (Pa) will be used in the multiple characteristic formula as specified in Section 506.4(a)3 to determine the lot payment.
formula:
+ +=500) Pa Pd 2 Ps 2 (C Lp p where:
L p = Lot Payment
C p = Contract price per lot (contract price times lot size) Ps = Characteristic Percentage of Compressive Strength. (Table B)