By E. Poulsen, L. Mejlbro
This e-book is the main entire and versatile conception of chloride ingress in concrete up to now. in line with try out effects and box observations, the ebook demonstrates the simple program of this idea to perform.
The info is gifted in a transparent type with each one bankruptcy containing an creation, technical functions and examples, and a last part masking the maths in the back of the idea, to permit the reader to acquire a deeper perception into the topic.
Primarily aimed toward training engineers engaged in research and layout of concrete constructions uncovered to a chloride weighted down surroundings, this ebook can also be an invaluable reference for mathematicians and engineering scholars.
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Extra info for Diffusion of chloride in concrete : theory and application
However, no observation so far indicates that the chloride diﬀusion in concrete should be characterized as an ‘anomalous’ diﬀusion. The diﬀerential equation of diﬀusion One-dimensional problems. By applying Fick’s ﬁrst general law of diﬀusion, CHAPTER 1. e. 2) becomes ∂C ∂ = ∂t ∂x D ∂C ∂x . e. the function D = D(t). If only few observations exist in a speciﬁc case it is possible to estimate an upper and lower bound for the variation of D = D(t). To solve this partial diﬀerential equation the initial condition and the boundary condition have to be known, cf.
The unit of the electronic current Icorr is usually μA. It is convenient to deﬁne the corrosion rate of a corroding reinforcing bar where the corrosion zone has a length s and a diameter ds as icorr = Icorr . 12) 2 Thus, the unit of the corrosion rate icorr is μA/cm . 6 μm/yr for a corrosion 2 rate of 1 μA/cm , cf. Broomﬁeld (1997). In order to deﬁne the corrosion activity of reinforcement in concrete Broomﬁeld et al. (1993), (1994), deﬁnes the following under the assumption that the corrosion rate is kept constant • Passive condition: • Low to moderate corrosion rate: • Moderate to hich corrosion rate: • High corrosion rate: r < 1 μm/yr 1 μm/yr ≤ r < 5 μm/yr 5 μm/yr ≤ r < 10 μm/yr r ≥ 10 μm/yr.
3. 23: The pitting of reinforcing bars can be very severe. Here more than 50 % of the cross section of the reinforcing bar has disappeared by corrosion. • The structural detailing of the structure, and appropriate practical design to facilitate inspection, maintenance and repair. e. e. intensity and widths). • The types and the composition of the binder of the concrete. • The types of reinforcement. 2 there are several classes and subclasses of a chlorideladen environment, while the Code of Practice often deals with one or two classes.
Diffusion of chloride in concrete : theory and application by E. Poulsen, L. Mejlbro