Concrete Cracking Prediction Including the Filling Proportion of Strand Corrosion Products

Wang, Lei; Dai, Lizhao; Zhang, Xuhui; Zhang, Jianren

doi:10.3390/ma10010006

Cited by 13 publications

(4 citation statements)

References 38 publications

(45 reference statements)

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“…The crack width in RC structures was also calculated. Wang et al (2017) and Dai et al (2016) conducted accelerated corrosion tests of PC beams to investigate the cracking angle, crack width and corrosion loss, and proposed a calculation model for the crack width in a prestressed reinforcement at different corrosion states.…”

Section: Introductionmentioning

confidence: 99%

Numerical calculation of crack width in prestressed concrete beams with bond-slip effect

Liu

Yang

Zhang

et al. 2019

MMMS

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Purpose The calculation of the crack width is necessary for the design of prestressed concrete (PC) members. The purpose of this paper is to develop a numerical model based on the bond-slip theory to calculate the crack width in PC beams. Design/methodology/approach Stress calculation method for common reinforcement after beam crack has occurred depends on the difference in the bonding performance between prestressed reinforcement and common reinforcement. A numerical calculation model for determining the crack width in PC beams is developed based on the bond-slip theory, and verified using experimental data. The calculation values obtained by the proposed numerical model and code formulas are compared, and the applicability of the numerical model is evaluated. Findings The theoretical analysis and experimental results verified that the crack width of PC members calculated based on the bond-slip theory in this study is reasonable. Furthermore, the stress calculation method for the common reinforcement is verified. Compared with the model calculation results obtained in this study, the results obtained from code formulas are more conservative. Originality/value The numerical calculation model for crack width proposed in this study can be used by engineers as a reference for calculating the crack width in PC beams to ensure the durability of the PC member.

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Section: Introductionmentioning

confidence: 99%

Numerical calculation of crack width in prestressed concrete beams with bond-slip effect

Liu

Yang

Zhang

et al. 2019

MMMS

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“…Corrosion attack on the concrete reinforcement surface causes cracks on the surface of concrete and a decrease in bonding force of reinforcement. As an effect, cracks increase the degree of chloride ingress for concrete [21,22] and bond slipping [23] causes the tensile strength of concrete to decrease. Decreased flexural capacities due to corrosion attacks can occur in both reinforced concrete and pre-stressed concrete [24].…”

mentioning

confidence: 99%

Effect of Calcium Stearate in the Mechanical and Physical Properties of Concrete with PCC and Fly Ash as Binders

et al. 2020

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This work aims to study the effect of Ca(C 18 H 35 O 2 ) 2 (calcium stearate) on the properties of concrete by using Portland composite cement (PCC) and fly ash as binders. The calcium stearate content used in the concrete here consists of 0, 1, 5, and 10 kg per m 3 of concrete volume, or alternatively, 0 to 2.85% by the weight of cement. We have performed several tests for each of the contents, namely, compressive strength, water absorption, chloride ion infiltration, and accelerated corrosion tests. According to the testing, we have found that with the addition of calcium stearate at 1 kg/m 3 in self-compacting concrete (SCC) with 10% fly ash, the mechanical and physical properties of SCC can be improved significantly when compared to the SCC without fly ash and calcium stearate, resulting in a stable compressive strength, lower water absorption, lower chloride ion infiltration, and lower degree of corrosion attack.Materials 2020, 13, 1394 2 of 16 calcium silicate hydrate mineral referred to as C-S-H (tobermorite) [9]. Calcium hydroxide itself is one of the compounds formed when tricalcium silicate (C3S), dicalcium silicate (C2S), or tricalcium aluminate (C3A) reacts with water (H 2 O). The use of fly ash in concrete as a substitute for cement further increases the amount of C-S-H/calcium silicate hydrate (tobermorite) formed during the cement hydration process. It can reduce cement the consumption by 3.2-5 kg·m −3 ·MPa −1 [10]. In the process of cement production, millions of tons of CO 2 gas (a pollutant) is released because of combustion to make clinker. Reducing cement consumption in concrete consequently decreases the CO 2 emissions. Besides that, the appearance of fly ash in concrete also raises the alkalinity of concrete [11]. The higher the alkalinity of concrete, the greater the passive layer protected steel bar in concrete is from corrosion attack.Not only additives such as fly ash, slag, and silica fumes, but superplasticizers such as water reducers [12] in concrete also can reduce the capillaries and pores [13] in concrete. Although the water/cement ratio used in concrete is very small, the workability of fresh concrete remains good, and this is easily maintained by adding a superplasticizer to the concrete [14]. Because of the low water/cement ratio used, autogenous shrinkage is reduced. Other effects include increasing the elastic modulus [15] and raising the anti-carbonation of the concrete [16].A large contact angle makes it more difficult for water to seep into concrete [17]. As a result, the water absorption of concrete also drops significantly. Furthermore, in general, chloride ions penetrate into concrete along with water because of the greater contact angle. Automatically, concrete-containing large silica particles are more resistant to corrosion attack. On the contrary, in concrete made with the addition of a water-entraining agent [18], chloride ions enter into concrete more easily, especially in young concrete [19,20]. Corrosion attack on the concrete reinforcement surface causes cracks ...

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“…Para Wang et al (2017) el ancho de fisura w es el parámetro controlante del proceso de ocupación de las fisuras por parte de los productos de corrosión. Para los autores, el porcentaje de volumen ocupado por los óxidos con respecto al volumen total liberado por la fisuración crece con el aumento del ancho de fisura, hasta alcanzar un valor máximo en el que se estabiliza.…”

Section: Volumen De óXidos En Fisurasunclassified

“…6-13): La revisión bibliográfica ha permitido comprobar que los aspectos relativos a este fenómeno que conllevan más controversia son, por un lado, la determinación del porcentaje de espacio liberado por las fisuras ΔV crack que es ocupado por los productos de corrosión, incrementando el volumen disponible para la expansión de los óxidos V rc y disminuyendo consecuentemente la presión p que se ejerce sobre la pared interna del cilindro de hormigón, y por otro, cuáles son los parámetros que determinan dicho porcentaje. En vista de los trabajos analizados se puede deducir que existen tres parámetros fundamentales que determinan el valor de dicho porcentaje: el espesor de recubrimiento c (Val, et al, 2008), la extensión de la fisuración (Wang, et al, 2017), y por último, el valor de la densidad de corriente de corrosión i corr (Lu, et al, 2010).…”

Section: Volumen De óXidos En Fisurasunclassified

Influencia de la corrosión en la adherencia de alambres en elementos pretensados de hormigón

Gil¹

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Mi más sincero reconocimiento y gratitud se dirige, en primer lugar, a los Directores de esta tesis, Dr. Carmen Andrade Perdrix y Dr. Jesús Rodríguez Santiago, cuya experiencia, consejo y dedicación han permitido que este trabajo llegue a buen término. A Carmen Andrade querría agradecerle no sólo compartir conmigo una pequeña parte de sus vastos conocimientos en el campo de la corrosión de armaduras, sino especialmente, transmitirme su pasión por la investigación. A Jesús Rodríguez le debo su constante apoyo durante los últimos años de mi carrera de arquitectura y mis primeros años en el mundo laboral, así como su asesoramiento durante el largo periodo de elaboración de esta tesis. Sin sus conocimientos en el campo del hormigón estructural, esta investigación no hubiera sido posible.Un reconocimiento especial lo reservo para la Dr. Beatriz Martín-Pérez, cuya implicación en el desarrollo de este trabajo, más allá de cualquier obligación, la convierten por derecho propio en la tercera directora de esta tesis. A Beatriz Martín-Pérez le agradezco sinceramente su cálida acogida en un país y universidad desconocidos, durante mi estancia de dos años en la Universidad de Ottawa, y su impagable apoyo en el desarrollo del modelo analítico de esta tesis, gracias al cual esta investigación ganó en calidad, coherencia y solidez.Me gustaría agradecer a la financiación aportada para la realización de esta tesis, sin la cual no hubiera sido viable, tanto por el Consejo Superior de Investigaciones Científicas (CSIC), mediante su beca predoctoral JAE-PREDOC, como por la Comisión Europea, mediante su beca predoctoral NOVA DOMUS, del programa ERASMUS MUNDUS, que permitió mi estancia en el

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Concrete Cracking Prediction Including the Filling Proportion of Strand Corrosion Products

Cited by 13 publications

References 38 publications

Numerical calculation of crack width in prestressed concrete beams with bond-slip effect

Numerical calculation of crack width in prestressed concrete beams with bond-slip effect

Effect of Calcium Stearate in the Mechanical and Physical Properties of Concrete with PCC and Fly Ash as Binders

Influencia de la corrosión en la adherencia de alambres en elementos pretensados de hormigón

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