石灰石粉掺量对混凝土中钢筋脱钝临界氯离子含量的影响

doi:10.11896/cldb.22090288

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Abstract The effect of limestone powder (LP) content on the chloride threshold for rebar depassivation was investigated. Wetting-drying cycles were conducted to accelerate the chloride penetration into concrete specimens. Half-cell potential and AC impedance techniques were employed to monitor the dynamic changes of self-corrosion potential (E_corr) and corrosion current density (i_corr), respectively, which were used to diagnose the corrosion condition of the rebar. The results indicate that the chloride threshold decreases as the LP content increases, which is attributed to the lower pH value of concrete pore solution due to decreased cement content. XRD patterns demonstrate that incorporating LP inhibits the formation of monosulfate (AFm) phase, thereby undermining the chloride binding capacity of the hydrates. The variation of i_corr with time follows a three-parameter Weibull distribution, with the probability density representing the rate of passivity breakdown, which is found to increase with increasing limestone content.

Key words： limestone powder content chloride threshold corrosion potential and current density passivity breakdown Weibull distribution

Published: Online: 2024-01-16

CLC number:

TU528

Fund:National Natural Science Foundation of China (52078183).

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	LI Chenzhi
	JIANG Linhua

Cite this article:

LI Chenzhi,JIANG Linhua. Effect of Limestone Powder Content on Chloride Threshold for Rebar Depassivation in Concrete[J]. Materials Reports, 2024, 38(1): 22090288-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22090288 OR http://www.mater-rep.com/EN/Y2024/V38/I1/22090288

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