IN-SITU PH VALUE MONITORING SYSTEM OF CONCRETE PORE SOLUTION

摘要

A new auto-logger system device of Open-circuit potential(OCP) was introduced in thispaper, a method of melt-oxidation at high temperature was adopted to fabricate lr/lrOx pHelectrode, the new auto-logger and in-situ pH value monitoring system for use in cementbased porous materials has been invented and tested in solution and in concrete blocks. Theresults show that the lr/IrOx pH electrode have excellent sensing, which follow the Nernst lawwith good linearity in a pH range from 2.0 to 14.0, and have a good long-term stability inalkaline medium. The pH values of concrete pore solution measured by in-situ monitoringsystem is in good quantitative agreement with that determined by pore solution expressionmethod. The In-situ monitoring system can collect the date and supply useful information todurability evaluation of reinforced concrete.