Effect of Cracking on Water and Chloride Permeability of Concrete

Aldea, Corina Maria; Shah, Surendra P.; Karr, Alan F.

doi:10.1061/(asce)0899-1561(1999)11:3(181)

Cited by 213 publications

(98 citation statements)

References 7 publications

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“…Using the feedback controlled splitting test method, Wang et al (1997) and Aldea et al (1999) pointed out that the degree of the permeability of cracked concrete depends on the value of the crack opening (crack width W cr ) in the concrete. But when a crack opening displacement is less than 50μm, the crack opening had little effect on the permeability.…”

Section: Review Of Previous Studiesmentioning

confidence: 99%

“…The testing schemes for evaluation transport property of cracked concrete can be divided into three kinds based on the loading method: uniaxial compressive test (Saito and Ishimori 1995;Lim et al 2000;Samaha and Hover 1992 splitting test (Wang et al 1997;Aldea et al 1999;Kato et al 2005) and flexural test Xing et al 2005a). The effect of microcracking on transport property under uniaxial compression has been studied by several researchers.…”

Section: Review Of Previous Studiesmentioning

confidence: 99%

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Simulation of Chloride Diffusivity for Cracked Concrete Based on RBSM and Truss Network Model

Wang

Soda²,

Ueda

2008

ACT

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For concrete structures exposed to salt environment, the microstructure and cracks play a crucial role in the ingress of chloride ions into concrete. In this study, concrete is simulated on the meso scale as a three-phase composite, i.e., aggregate particles, mortar and the interfacial transition zone (ITZ). Because of the advantages in predicting cracks behavior in concrete, Rigid Body Spring Model (RBSM) is employed to carry out the mechanical analysis to simulate the distribution and width of microcracks. And then, the truss network model is adopted to evaluate the chloride diffusivity of the cracked concrete. On the basis of the statistics analysis of diffusion coefficients of concrete and mortar determined experimentally, the diffusivity of ITZ is analytically clarified. The range of diffusion coefficient of ITZ estimated in this paper is approximately 3-16 times of that of mortar depending on the different assumed thickness, which agrees well with that of the previous experimental results. With the aim to validate the effect of microcracks on the diffusivity of concrete, a series of the chloride ions penetrating analysis is numerically carried out on the concrete specimen under different stress levels. The axial compressive and tensile loading conditions are investigated respectively and the effects of stress level on chloride diffusivity of cracked concrete are examined. Results indicate that the chloride diffusivity is significantly dependent on the stress level, but only considering the effect of cracks predicted by RBSM is not sufficient. So an empirical equation which can account for the microstructure variation of concrete under loading is proposed. With it, a reasonable estimation for chloride diffusivity of cracked concrete is achieved.

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Section: Review Of Previous Studiesmentioning

confidence: 99%

Section: Review Of Previous Studiesmentioning

confidence: 99%

Simulation of Chloride Diffusivity for Cracked Concrete Based on RBSM and Truss Network Model

Wang

Soda²,

Ueda

2008

ACT

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“…Permeability is usually taken as an indicator representing the ability of concrete to water transport. Most of the earlier works concerning the effect of load level on water transport used permeability as the evaluation parameter (Aldea, Ghandehari, Shah, & Karr, 2000;Aldea, Shah, & Karr, 1999a, 1999bHearn, 1999;Wang, Jansan, & Shah, 1997). The results of these studies indicated that cracks can dramatically increase the permeability to several orders of magnitude.…”

Section: Introductionmentioning

confidence: 55%

Experimental Study on Water Absorption by Concrete Damaged by Uniaxial Loading

Wang¹

2014

Proceedings of the 4th International Conference on the Durability of Concrete Structures

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Cracking of concrete, which may be induced by several mechanisms, such as shrinkage, thermal effect, and loading, plays an important role in the deterioration of reinforced concrete structures because they provide additional pathways for water and aggressive agents, for example, chlorides, to penetrate into concrete. To well understand the transport properties of cracked/damaged concrete is essential for predicting its long-term durability. In general, water acts as the medium for agents to move into concrete, and water penetration by capillary absorption is more common for the real concrete structures since concrete is rarely saturated. As a result, absorption of water is regarded as the dominant factor for the ingress of aggressive substances. This article presents an experimental investigation on capillary absorption of concrete after being subjected to various loading patterns and levels. The sorptivity is chosen as a parameter to describe the rate of water moving into concrete since it can characterize the tendency of cementitious material to absorb and transmit water by capillary mechanism. A series of water absorption experiments were conducted on the concrete samples after they were subjected to uniaxial compressive or tensile loading. Three load levels, 70, 80, and 90%, of the corresponding compression and tension loading capacity were considered. An improved gravimetrical test equipment was used to measure the cumulative water content absorbed by concrete at the given time of exposure. The results show that mechanical loading, compression, or tension, has an important influence on water absorption property of concrete. The rate of capillary absorption of loading-damaged concrete can be raised up to two times of sound concrete samples for the ranges of load level studied.

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“…The drawback is that only a single crack can be generated. Aldea et al (1999-2) carried out an investigation on the influence of cracks from 50 to 400 pm on chloride permeability of nomal and high strength concretes by RCPT. Chloride conductivity was sensitive to cracking only for high strength concrete with low water to cernent ratio of 6.25 as follows: cracks less than 200 pm had no effect, while cracks between 200 and 400 pm resulted in higher chloride conduction.…”

Section: Feedback-controlled Spütting Testmentioning

confidence: 99%

Influence of Cracks on Chloride Ingress into Concrete

2003

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Effect of Cracking on Water and Chloride Permeability of Concrete

Cited by 213 publications

References 7 publications

Simulation of Chloride Diffusivity for Cracked Concrete Based on RBSM and Truss Network Model

Simulation of Chloride Diffusivity for Cracked Concrete Based on RBSM and Truss Network Model

Experimental Study on Water Absorption by Concrete Damaged by Uniaxial Loading

Influence of Cracks on Chloride Ingress into Concrete

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