Prestressed Conc.pdf · 2020. 9. 10. · ments of BS 2691: 1969. Strands. A group of either seven...
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Prestressed Conc.pdf · 2020. 9. 10. · ments of BS 2691: 1969. Strands. A group of either seven or 19 wires wound in helical form complying with the require- ments of BS 3617: 1971