Steel Corrosion-Induced Concrete Cracking

PrefaceChapter 1. Introduction1.1 Background1.2 Empirical models1.2.1 Critical steel corrosion at surface cracking1.2.2 Crack width at the concrete surface1.2.3 Discussion on the empirical models1.3 Analytical models1.3.1 Three-stage corrosion-induced cracking model1.3.2 Corrosion filling stage1.3.3 Concrete cover stressing and cracking1.3.4 Rust filling in corrosion-induced cracks1.4 Contents of this bookReferences

Chapter 2. Steel corrosion in concrete2.1 Introduction2.2 Mechanisms of steel corrosion in concrete2.2.1 Corrosion process2.2.2 Corrosion rate2.2.3 Passivation2.3 Steel corrosion induced by carbonation or chloride attack2.3.1 Carbonation-induced corrosion2.3.2 Chloride-induced corrosion2.4 Corrosion products2.5 Steel corrosion-induced concrete damage2.6 ConclusionsReferences

Chapter 3. Expansion coefficients and modulus of steel corrosion3.1 Introduction3.2 Expansion coefficient of steel corrosion3.2.1 Experimental program3.2.2 Tested results3.2.3 Composition of rust samples3.2.4 Expansion coefficient of rust samples3.3 Modulus of steel corrosion in concrete3.3.1 Experimental program3.3.2 Loading and unloading stress-strain curve3.3.3 Tested date of cyclic low-compression test3.3.4 Modulus of rust3.4 ConclusionsReferences

Chapter 4. Damage analysis and cracking model of reinforced concrete structures with rebar corrosion4.1 Introduction4.2 Basic concrete cracking model due to steel corrosion4.3 Corrosion-induced cracking process4.3 Non-cracking stage of corrosion-induced concrete cracking process4.4 Partial cracking stage of corrosion-induced concrete cracking process4.4.1 Intact part 4.4.2 Cracked part 4.5 Discussion on corrosion-induced expansive pressure4.5.1 Relation between expansive pressure and steel corrosion4.5.2 Variation of expansive pressure4.5.3 Effect of concrete cover thickness4.5.4 Effect of steel bar diameter4.5.5 Effect of concrete quality4.6 Discussion on the radial loss of steel bar4.6.1 Steel loss varying with the crack length4.6.2 Steel loss at surface cracking4.6.3 Effect of concrete cover thickness4.6.4 Effect of steel bar diameter4.6.5 Effect of rust expansion coefficient4.6.6 Effect of concrete quality4.7 ConclusionsReferences

Chapter 5. Critical thickness of rust layer at concrete surface cracking5.1 Introduction5.2 Experimental program5.2.1 Reinforced concrete specimens5.2.2 Accelerated steel corrosion5.2.3 Sample preparation5.2.4 Observation and measurement5.3 Rust distributions in the cracking sample5.4 Millscale5.5 Corrosion layer thickness at surface cracking of concrete cover5.5.1 At outer surface cracking5.5.2 At inner surface cracking5.6 ConclusionsReferences

Chapter 6. Rust distribution in corrosion-induced cracking concrete6.1 Introduction6.2 Experimental program6.2.1 Reinforced concrete specimen6.2.2 Curing and exposure history6.2.3 Sample preparation6.2.4 Observation and measurements6.3 Rust distributions at the Steel/concrete interfaces6.4 Distribution of the corrosion-filled paste (CP)6.5 Rust distribution in corrosion-induced cracks6.5.1 Rust distribution in cracks by digital microscope6.5.2 Rust filling in cracks by SEM6.5.3 Discussion of rust filling corrosion-induced cracks6.6 Crack propagation and rust development6.6.1 Crack propagation6.6.2 Rust development6.7 ConclusionsReferences

Chapter 7. Non-uniform distribution of rust layer around steel bar in concrete7.1 Introduction7.2 Steel corrosion and corrosion-induced cracks7.3 Gaussian model to describe the non-uniform rust layer7.4 Comparing the proposed Gaussian model with other models7.5 Parameters in Gaussian model7.5.1 λ3 - uniform coefficient of the rust layer7.5.2 λ1 - non-uniform coefficient of the rust layer7.5.3 λ2 - spread coefficient of rust layer7.5.4 Relationships among parameters before concrete surface cracking7.6 ConclusionsReferences

Chapter 8. Crack shape in corrosion-induced cracking concrete cover8.1 Introduction8.2 Experimental Program8.2.1 Reinforced concrete specimens8.2.2 Accelerated corrosion history8.2.3 Sample preparation8.2.4 Observation and measurement8.3 Crack shape8.3.1 Crack width model8.3.2 a1 - Crack width variation coefficient8.3.3 a2 - Crack width coefficient at the surface of the steel bar8.4 Crack width and corrosion layer thickness8.4.1 Relationship between crack width Wi and corrosion layer thickness TCL8.4.2 Wc - Critical crack width at concrete outer surface cracking8.4.3 Ws - Crack width on the surface of concrete cover8.5 Relationship of corrosion layer thickness TCL and crack width variation coefficient a18.6 Crack shape in different type of concrete8.7 ConclusionsReferences

Chapter 9. Development of the corrosion-filled paste at the steel/concrete interface9.1 Introduction9.2 Influence of cracks on CP thickness9.3 Relation between TCP and TCL- excluding the effect of inner cracks9.4 Relation between TCP and TCL- including the inner cracks9.5 ConclusionsReferences

Chapter 10. Corrosion-induced concrete cracking model considering corrosion-filled paste10.1 Introduction10.2 Corrosion-induced concrete surface cracking model considering CP10.2.1 Cracking process description10.2.2 TCP - TCL model10.2.3 Nominal ratio between the corrosion products volume and the basic steel volume10.2.4 Model verification10.3 Time from corrosion initiation to concrete surface cracking10.3.1 Faraday’s Law10.3.2 Corrosion rate10.4 Discussion of non-uniform corrosion situation10.5 Discussion of influence of loading on cracking model10.5.1 Force contributed by the mechanical interlocking10.5.2 Intersecting cracks and localized corrosion10.6 ConclusionsReferencesNotationsIndex