714.6(d) 714.7(b) end of each precast unit as soon as possible after stripping using a permanent marking system. For inlets , manholes, and junction boxes, also provide the type identification. Identify barrier meeting NCHRP 350 by indenting the top section of each barrier section with minimum 2 -inch block lettering as follows: “T 350” for temporary barrier and “P 350” for permanent barrier . Identify barrier meeting MASH by indenting the top section of each barrier section with minimum 2 -inch block lettering as follows: “T-M-XX” for temporary barrier and “P -M-XX” for permanent barrier. The “XX” characters indicate the MASH compliance year (e.g. , “09” for 2009, “16” for 201 6, etc.). Use temporary barrier conforming to the manufacturing and crash testing requirements as specified in
precast concrete deck panels as shown on the Standard Drawings and as specified in Section 1107.01(b). Conduct welding and testing of assembly as specified in Section 1105 and according to the applicable AASHTO and AWS codes. Alternate vertical adjustment devices may be used if the structure can be produced within the specified erection tolerances.
714.7CONCRETE —
in Section 704, for each lot. If the test results of the acceptance cylinders fail to meet the required 28 -day minimum compressive strength, the disposition of the products will be resolved as specified in Section
110.13. Perform plastic concrete slump, air, and temperature testing at the frequencies established in
Section 704 and Publication 145. Perform slump, ai r content, and temperature tests according to Section 704. For self-consolidating concrete mixtures (SCC) p erform slump flow tests according to ASTM C1611 /C1611M , perform J-Ring tests according to ASTM C1621 /C1621M .
a workable mix for the precast concrete units. Maintain the cement concrete consistency within 1 1/2 inches on either side of the selected value . At no time is the slump upper limit to exceed 5 inches for mixes witho ut water -reducing admixtures, 6 1/2 inches for mixes with water -reducing admixtures, and 8 inches for mixes with high range water -reducing admixtures (superplasticizers). If the upper limit is exceeded on any slump test, the plant’s technician must reject the cement concrete.
C1611 /C1611M . Evaluate the visual stability index (VSI) of the mixture when the slump flow is measured