Main causes, signs, and consequences of aging of concrete dams

Durcheva, V. N.; Puchkova, S. M.

doi:10.1007/bf01544998

Cited by 5 publications

(3 citation statements)

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“…One of the most important parameters is the "porosity" of the paste, which is a function of the amount of water relative to the cementitious materials. Excessive water can dilute the cement paste leaving a medium more porous, which is more vulnerable to deleterious substances and physical processes (Dolen 2005;Dolen 2006;Durcheva and Puchkova 1995;Tsulukidze 1962). The climate is a significant environmental factor influencing the long-term durability of concrete structures.…”

Section: Aging Of Concrete Structurementioning

confidence: 98%

Operation and Maintenance of Hydraulic Structures

Chen

2015

Hydraulic Structures

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Section: Aging Of Concrete Structurementioning

confidence: 98%

Operation and Maintenance of Hydraulic Structures

Chen

2015

Hydraulic Structures

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“…Such an adverse chain reaction may eventually result in destructive deterioration of the concrete structure . Leakage or uplift is acknowledged as direct relevant for dam safety . Therefore, it is significant to monitor the uplift pressure and leakage flow in concrete dams with cracks to identify the long‐term behavior.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive investigation of leakage problems for concrete gravity dams with penetrating cracks based on detection and monitoring data: A case study

2017

Struct Control Health Monit

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Summary The leakage amount is an important indicator evaluating the seepage behavior of a dam. Due to the complex behavior, crack development judgment and leakage behavior identification for concrete gravity dams remain a challenging task. The paper is concerned with comprehensive investigation of leakage problems for concrete gravity dams with penetrating cracks. A case study on Shimantan Reservoir Dam was taken to examine the utilization of the comprehensive investigation method. Deficiency investigations were undertaken to identify the nature and sources of defects responsible for the serious leakage. Based on the information acquired from field visual inspections and ground‐penetrating radar tests, it is apparent that several transverse cracks penetrate the dam crest and propagate downward into the dam body. The results of the remedial grouting, X‐ray diffraction analyses and water injection tests reflect the appearance of penetrating leakage paths in the dam body. Subsequently, 2 behavior models including the special hydrostatic‐seasonal‐time model and the inverse analysis model were conducted to distinguish the contribution of penetrating cracks to leakage amount. The special hydrostatic‐seasonal‐time model was modified to address the influence of leakage flow in real microcracks in concrete dams based on the Navier–Stokes equation. The result shows that the proposed models provide an acceptable accuracy in analyzing leakage monitoring data for gravity dams with penetrating cracks. Leakage flow in penetrating cracks plays a dominant role in the dam seepage field. The execution flow in this paper could be readily employed in investigations of similar problems of concrete dams.

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“…The time-variant external loads with an aggressive environment lead to accumulated chemical damage (e.g. calcium leaching, sulfate attack and alkali-aggregate reactions) (Su et al , 2013; Wu et al , 2007; Durcheva and Puchkova, 1995; Liu et al , 2014), mechanical damage (i.e. physical damage) (e.g.…”

Section: Introductionmentioning

confidence: 99%

Multi-scale numerical simulation analysis for influence of combined leaching and frost deteriorations on mechanical properties of concrete

Hu¹

2016

MMMS

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Purpose The multi-scale numerical simulation method, able to represent the complexity of the random structures and capture phase degradation, is an effective way to investigate the long-term behavior of concrete in service and bridges the gap between research on the material and on the structural level. However, the combined chemical-physical deterioration mechanisms of concrete remain a challenging task. The purpose of this paper is to investigate the degradation mechanism of concrete at the waterline in cold regions induced by combined calcium leaching and frost damage. Design/methodology/approach With the help of the NIST’s three-dimensional (3D) hydration model and the random aggregate model, realistic 3D representative volume elements (RVEs) of concrete at the micro-, the meso-, and the macro-scales can be reconstructed. The boundary problem method is introduced to compute the homogenized mechanical properties for both sound and damaged RVEs. According to the damage characteristics, the staggering method including a random dissolution model and a thermo-mechanical coupling model is developed to simulate the synergy deterioration effects of interacted calcium leaching and frost attacks. The coupled damage procedure for the frost damage process is based on the hydraulic pressure theory and the ice lens growth theory considering the relationship between the frozen temperature and the radius of the capillary pore. Finally, regarding calcium leaching as the leading role in actual engineering, the numerical methodology for combined leaching and frost damage on concrete property is proposed using a successive multi-scale method. Findings On the basis of available experimental data, this methodology is employed to explore the deterioration process. The results agree with the experimental ones to some extent, chemical leaching leads to the nucleation of some micro-cracks (i.e. damage), and consequently, to the decrease of the frost resistance. Originality/value It is demonstrated that the multi-scale numerical methodology can capture potential aging and deterioration evolution processes, and can give an insight into the macroscopic property degradation of concrete under long-term aggressive conditions.

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Main causes, signs, and consequences of aging of concrete dams

Cited by 5 publications

References 1 publication

Operation and Maintenance of Hydraulic Structures

Operation and Maintenance of Hydraulic Structures

Comprehensive investigation of leakage problems for concrete gravity dams with penetrating cracks based on detection and monitoring data: A case study

Multi-scale numerical simulation analysis for influence of combined leaching and frost deteriorations on mechanical properties of concrete

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