RAPID CHLORIDE PERMEABILITY TEST APPARATUS

详情

Concretes incorporating fly ash or silica fume are less permeable to deleterious elements and thus are more durable than conventional concretes. The Rapid Chloride-ion Permeability Test (RCPT) was designed to assess the resistance of concrete to the penetration of chloride ions, an indicator of its permeability.

This is a  fully self-contained, complete kit as per ASTM C ******5  including the following items:

.• Plexiglass chambers with brass mesh, terminals and  Steel bolts - 3 Pairs. 

• *0V DC Constant voltage power supply with 3 channels – *1 No.
• **0 mm vacuum dessicator – *1 No..
• Vacuum pump – *1 No.
• Double Stage Moisture trap – *1 No.
• Electrometric Rubber Moulds for cylindrical specimens - 3 Nos.
• Temperature probe – *1 No.
• Consumables - good for 1 doz. tests
o RTV sealant + gun – *1 No.
o Acrylic sealer + brush - *1 No. 

The concrete cylindrical specimen - *0 mm thk. is first prepared by coating the dry surface with a sealer and then  vacuum conditioning it as per the ASTM codal procedure. Then the saturated specimen is mounted in the Plexiglass chambers, the sealant applied and the reservoirs filled with NaCl & NaOH respectively.The terminals are then connected to the *0 V DC power supply and the current read in mA on the digital readouts every ½ hr. for 6 hrs. The current magnitude depends on the ions passing through the pores of the concrete specimen (including chloride ions), which in turn depend on the permeability of concrete.  The  total charge Q passed in 6 hrs. is calculated as per the formula :

Q   =   **0x( I0 +  2 × I*0 +  2 × I*0 +  2 × I**0   ........+  I**0)