Factors controlling cracking of concrete affected by reinforcement corrosion

Abstract

A B S T R A C T R I~ S U M I ~The present paper tries to contribute to quantifying the relationship between the amount of corrosion and cover cracking. The variables studied were: cover/diameter (c/o), proportions of cement, w/c, cast position of the bar, transverse reinforcement and corrosion rate. The corrosion is accelerated by applying constant currents causing the rebar to act as an anode. The results indicate that the cracking process develops in two steps: generation and propagation. Radius losses of about 15-50 btm are necessary to generate the first visible crack (< 0.1 mm width). The propagation follows a behaviour of the type: w (crack width in mm) = a + bx (radius loss in gm).

Probability Model of Corrosion-Induced Cracking Time in Chloride-Contaminated Reinforced Concrete

“…The observed times given by Liu & Weyers (1998) also be included in Figure 3. From Figures 2 and 3, it can be seen that the mean and 90% confidence interval of t cr increase with the increase in cover thickness for the same strength concrete, which was recognized and also confirmed by the data reported by Alonso, Andrade, Rodriguez, & Diez (1998). As seen in Figure 3, the test times of t cr observed by Liu and Weyers (1998) are in the range of 90% confidence interval and follow nearly with the mean curve, which indicates that the probabilistic model expressed by Weibull function is acceptable in predicting the cover cracking time.…”

“…For the problem of the corrosion-induced cover cracking in concrete, lots of laboratory tests and field investigations have been conducted by many researchers (Alonso, Andrade, Rodriguez, & Diez, 1998;Andrade, Alonso, & Molina, 1993;Liu & Weyers, 1998;Oh, Kim, & Jang, 2009;Rasheeduzzafar, AlSaadoun, & Al-Gahtani, 1992;Vu & Stewart, 2005), and some theoretical models predicting the time of cover cracking have been proposed (Bazant, 1979;Bhargava, Ghosh, Mori, & Ramanujam, 2005;Li, Melchers, & Zheng, 2006;Liu & Weyers, 1998;Lu, Jin, & Liu, 2011;Maaddawy & Soudki, 2007;Morinaga, 1988). Except for the above researches about analytical models, some researchers tended to model the cracking behavior using nonlinear fracture mechanics or finite-element method (Ahmed, Maalej, & Mihashi, 2007;Chen & Mahadevan, 2008;Hansen & Saouma, 1999;Pantazopoulou & Papoulia, 2001).…”

An experimental and numerical study of the pattern of cracking of concrete due to steel reinforcement corrosion

“…It involves generation of an oxide layer on the bar surface, which results in a decrease of the net cross-sectional area, thus, reducing its strength and decreasing the overall safety of the structure. However, long before a significant reduction in area is achieved, the volumetric expansion of the oxide induces internal pressure on the surrounding concrete, and leads to the cracking of concrete and, eventually, to full spalling of the cover [1][2][3].…”

Corrosion in Concrete Structures with Permanent Deformation in Marine Environment

“…It is worth mentioning that the tested face is the lower one, considering the concrete direction inside the shuttering. This is the least porous concrete, produced by mild material segregation during concrete casting [6] and it was considered the best representation for the simulated situation. Fig.…”