APPENDIX E ASTM SPECIFICATIONS Table of Contents E.1 ASTM ...
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NCHRP 18-14, Final Report Draft, Appendix E E-1 APPENDIX E ASTM SPECIFICATIONS Table of Contents E.1 ASTM D6489-99 ............................................................................................................. E-1 E.2 ASTM G109–99a ............................................................................................................. E-5
Transcript of APPENDIX E ASTM SPECIFICATIONS Table of Contents E.1 ASTM ...
NCHRP 18-14, Final Report Draft, Appendix E E-1
APPENDIX E
ASTM SPECIFICATIONS
Table of Contents
E.1 ASTM D6489-99 ............................................................................................................. E-1
E.2 ASTM G109–99a ............................................................................................................. E-5
NCHRP 18-14, Final Report Draft, Appendix E E-2
E.1 ASTM D6489-99
NCHRP 18-14, Final Report Draft, Appendix E E-3
NCHRP 18-14, Final Report Draft, Appendix E E-4
NCHRP 18-14, Final Report Draft, Appendix E E-5
E.2 ASTM G109–99a
ASTM G109–99a is used to test the effect of chemical admixtures added to the concrete
mix on the corrosion of embedded steel reinforcement. Three concrete prisms (6 x 4.5 x 11 in.),
are made for every concrete mix that contains chemical admixtures. Also, three specimens that
are made from a concrete mix with no chemical admixture are used as control specimens. Each
specimen is provided with three steel bars made of the same size. The bar size can range from #3
to #5. The tips of the bars are covered with electroplater tape. One bar is installed close to the
top surface of the specimen and is used as the anode of the circuit. Two bars are installed close to
the bottom surface and are used as the cathode of the circuit. The top surface of the specimen is
exposed to the salt solution for two weeks and then removed for the next two weeks. The voltage
across a 100-ohm resistor is measured at the beginning of the second week of every ponding
period, and the corresponding current is calculated.
This ponding-dry periods are repeated until the average integrated macrocell current of
the control specimens is 150 Coulombs or greater, and at least half of the specimens show
integrated macrocell current equal to 150 Coulombs or greater. ASTM G 109 – 99a states that
this limit will be reached in about six months. The total integrated corrosion at various time
periods (1, 2, ….and 6 months) is calculated and compared to that of control specimens.
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