Sampling for compliance to astm a416 is done at this stage of production. Seamless tubes shall be manufactured by a process that does not involve welding at. For annual book of astm standards volume information, refer to the standards document summary page on the astm website. A416 a416m specification for lowrelaxation, sevenwire steel strand for prestressed concrete. Astm a270 standard for stainless steel sanitary tubing. Certified to meet the american association of state highway and transportation officials aashto specifications for use in vehicle bridges. Standard specification for lowrelaxation, sevenwire steel strand for prestressed concrete. Guaranteed to meet aashto m270 specifications, but may also be dual. Special sizes or non standard size astm a270 stainless steel seamless and welded tubing in round, square, rectangular form. Grade 270 ksi, sevenwire prestressing strand, conforming to astm a416a416m, standard specification for lowrelaxation, sevenwire steel strand for prestressed concrete, has been used. Astm a416 low relaxation grade 7 wire strand astm a421 prestressing wire imperial imperial metric metric grade 250 grade 250 grade 270 grade 270 nominal diameter in breaking strength lbf nominal steel area in2 nominal weight lbft minimum load at 1% extension lbf 38 716 12 0,600 20 000 27 000 36 000 54 000 0,080 0,108 0,144 0.
Development of a precision statement for astm a1061. The reported results were used to examine how the methods areimplemented in practice and how precise the results are when the. Concrete masonry units cmu per astm c90 with minimum net area compressive strength 1900 psi rebar per astm a615 grade 60 prestressing strand per astm a416 grade 270 low relaxation 732 inch wire per astm a510 mortar per astm c270. Astm a270 standard specification for seamless and welded austenitic stainless steel sanitary tubing. Astm a4162 specifies that minimum fpy for grade 270, lowrelaxation steel. Y distances minnesota department of transportation.
Astm a416a416m12a standard specification for steel strand, uncoated. Material properties of posttension strands amsysco post. At this point or at time of shipment, the finished coil of strand is packaged according to customer specifications. After the strand is wound, it is banded and removed from the machine. Specifications for prestressing strand sumiden wire.
Loflin abstract the first objective of this thesis was to determine the material properties of grade 270 and grade 300 prestressing strand of various sizes. Astm a416a416m12a standard specification for steel strand. Uncoated, 7wire stressrelieved strand complying with astm a416, grade 270, lowrelaxation. Astm a981a981m standard test method for evaluating bond strength for 0. The technical characteristics were checked and verified by the dubai central laboratory dcl. Loflin thesis submitted to the faculty of the virginia polytechnic institute and state university in. Bond and material properties of grade 300 and grade 270 prestressing strands bryan j. A416 a416m18 standard specification for lowrelaxation, sevenwire steel.
Testing 7wire strand for prestressed concrete the state of. For example, astm a4162 specifies that minimum fpy for grade 270, lowrelaxation steel be equal to 0. Standards posttensioning institute pti and astm a 416. Tension tests were performed on each type of strand. Testing equipment and procedures are covered by section vii of astm. Grade 250 1725 and grade 270 1860 have minimum tensile strengths of 250. Referenced astm standards the documents listed below are referenced within the subject standard but are not provided as part of the standard. A supplementary requirement s1 is provided for use where bond strength testing of 0.
Gti zero void posttensioning system rr 25791 page 3 of 3 this general approval of an equivalent alternate to the code is only valid where an engineer. Strand data sheet physical properties low relaxation uncoated strand 270 grade lr astm a416 strand diameter weight per length minimum breaking strength length per coil nominal area fraction in decimal in mm lb ft kg m lbf kn ft 2meters 2in mm 38 0. Material properties of the grade 300 and grade 270. Prestressing 7 wire low relaxation strand per astm a416. Astm a416,astm a421,bs 5896,en108,as 4672 prestressed. Buy high quality astm a270 stainless steel sanitary tubing in seamlesswelded. Thus, a reassessment of the astm a416 specification may result in an upward. A981a981m test method for evaluating bond strength for 0. What is astm a270 pdf specification for seamless and. Steel stocks and supplies aashto m270 structural steel plate. Aashto m 203mm 203 standard specification for steel. Grade 250 1725 and grade 270 1860 have minimum tensile strengths of 250 ksi 1725 mpa and 270 ksi 1860 mpa, respectively, based on the nominal area of the strand. For a volume license the pdf is licensed to the person in which it is assigned. The physical and mechanical properties correspond to grade 270 and 250, as.
Steel strand, uncoated sevenwire for prestressed concrete1. Wire uncoated low relaxation strand grade nominal strand diameter in mm strand tolerance in mm minimum breaking strength lbs. Based on this testing, astm should also remove the recommendation of simply using aluminum foil and standard vgrips to grip the strand. Grade 1725 250 and grade 1860 270 have minimum ultimate strengths of 1725 mpa 250 ksi and 1860 mpa 270 ksi, respectively, based on the nominal area of the strand. Sumiden wire products corporation specifications for prestressing strand technical data 1 specifications for prestressing strand technical data astm a416 seven.
Grout per astm c476 fg 3000 psi wmaximum 38 inch aggregate and 8 to 11 inch slump. Astm a416 a416m 18 standard specification for lowrelaxation. The breaking strength and yield strength tables in astm a416 2005 need to be updated with the new grade 300 strand information. Bond and material properties of grade 270 and grade 300 prestressing strands by bryan j. The following is a list of basic formulas for 270 ksi, 7wire prestressing steel strand per astma416 used in posttensioned concrete. Astma416 standard specification for lowrelaxation, sevenwire steel strand for prestressed concrete. Comply with applicable requirements of section 03300, castinplace concrete. Astm international standard references for astm a882. Stressstrain modeling of 270 ksi lowrelaxation prestressing. The top countries of suppliers are china, vietnam, from which the percentage of astm a416 supply is 97%, 2% respectively. Covers grades of seamless, welded, and heavily cold worked austenitic and ferriticaustenitic duplex stainless steel sanitary tubing.
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