Chloride diffusion behavior of engineered cementitious composite under dry-wet cycles

Sun, Renjuan; Hu, Xinlei; Ling, Yifeng; Zuo, Zhanxuan; Zhuang, Pei‐Zhi; Wang, Fei

doi:10.1016/j.conbuildmat.2020.119943

Cited by 43 publications

(11 citation statements)

References 44 publications

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“…Besides, polycarboxylate ether-based superplasticizer and viscosity modifying admixture (VMA) were added to adjust the fresh properties for casting. The mix proportion of the tested ECC are present in Table 1 [35]. The 28-day compressive strength and the Young's modulus of ECC measured on prismatic specimens (150 mm × 150 mm × 300 mm) were 52.3 MPa and 18.9 GPa, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…This phenomenon is more significant for specimens under lower fatigue stress level. Furthermore, it is interesting to notice that the peak crack width is close to 50 μm for all stress levels, with which the ECC should remain resistant to the penetration or diffusion of solutions containing aggressive ions [35,[62][63][64][65][66].…”

Section: Evolution Of Crack Width Distribution Under Fatigue Loadmentioning

confidence: 99%

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Fatigue life and cracking characterization of engineered cementitious composites (ECC) under flexural cyclic load

Sun

Han²,

Zhang

et al. 2022

Construction and Building Materials

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Section: Methodsmentioning

confidence: 99%

Section: Evolution Of Crack Width Distribution Under Fatigue Loadmentioning

confidence: 99%

Fatigue life and cracking characterization of engineered cementitious composites (ECC) under flexural cyclic load

Sun

Han²,

Zhang

et al. 2022

Construction and Building Materials

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“…During the past few decades, numerous efforts have been carried out to understand the durability of ECC in different environments, as this is of great importance to the safe and efficient operation of infrastructures. It has been shown that, compared with plain concrete/mortar, ECC has lower permeability [22] and stronger resistance to high temperature [23], chloride penetration [24,25], sulphate attack [24] and freeze-thaw cycles [26], especially under coupled mechanical loading and environment exposure conditions. However, not a lot is known about the carbonation resistance of the hardened ECC.…”

Section: Introductionmentioning

confidence: 99%

Carbonation Behavior of Engineered Cementitious Composites under Coupled Sustained Flexural Load and Accelerated Carbonation

Zhang

Shao

Zhang³

et al. 2022

Materials

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Engineered cementitious composites (ECCs) belong to a broad class of fibre-reinforced concrete. They incorporate synthetic polyvinyl alcohol (PVA) fibres, cement, fly ash and fine aggregates, and are designed to have a tensile strain capacity typically beyond 3%. This paper presents an investigation on the carbonation behaviour of engineered cementitious composites (ECCs) under coupled sustained flexural load and accelerated carbonation. The carbonation depth under a sustained stress level of 0, 0.075, 0.15, 0.3 and 0.6 relative to flexural strength was measured after 7, 14 and 28 days of accelerated carbonation. Thermogravimetric analysis, mercury intrusion porosimetry and microhardness measurements were carried out to show the coupled influence of sustained flexural load and accelerated carbonation on the changes of the mineral phases, porosity, pore size distribution and microhardness along the carbonation profile. A modified carbonation depth model that can be used to consider the coupled effect of flexural tensile stress and carbonation time was proposed. The results show that an exponential relationship can be observed between stress influence coefficient and flexural tensile stress level in the carbonation depth model of ECC, which is different when using plain concrete. Areas with a higher carbonation degree have greater microhardness, even under a large sustained load level, as the carbonation process refines the pore structure and the fibre bridges the crack effectively.

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“…The use of fly ash probably resulted in a denser matrix by reducing the pore size and thickness of the transition zone between fiber or sand and the surrounding cementitious matrix [20]. In the existing literature, most experiments of chloride diffusion in ECC were carried out under normal soaking or dry-wet cycles on dumbbell-shaped laboratory-size specimens [21]. However, the complex chloride diffusion behavior and corrosion process for the larger soil nail is not yet fully understood.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Chloride-Induced Corrosion of Soil Nail with Engineered Cementitious Composites (ECC) Grout

Zhou

et al. 2021

Infrastructures

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Conventionally, a soil nail is a piece of steel reinforcement installed inside a hole drilled into the slope and filled with cement paste (CP) grout. Chloride penetration is a major deterioration mechanism of conventional soil nails as the CP grout is easy to crack with an uncontrollable crack opening when the soil nail is subject to loading or ground movements. Engineered Cementitious Composites (ECC) are a class of fiber-reinforced material exhibiting excellent crack control even when loaded to several percent of strain, and therefore, ECCs have great potential to replace traditional CP grout in soil nails for achieving a long service life. In this study, the chloride ion transport characteristics and electrically accelerated corrosion process of steel rebar in ECC and CP grouts are systematically studied. The rapid chloride ion penetration test results showed a reduction of 76% and 58% passing charges in ECC with 0.15% and 0.3% pre-loading strain, respectively, as compared to that in un-cracked CP. Furthermore, the accelerated corrosion experimental data showed that ECC under pre-loading strain still exhibited a coefficient of chloride ion diffusion that is 20–50% lower than CP grout due to the ability to control crack width. Service life calculations based on experimentally measured parameters showed that the predicted corrosion rate and corrosion depth of soil nails in ECC grout were much lower than those in CP grout. The findings can facilitate the design of soil nails with excellent durability and long service life.

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Chloride diffusion behavior of engineered cementitious composite under dry-wet cycles

Cited by 43 publications

References 44 publications

Fatigue life and cracking characterization of engineered cementitious composites (ECC) under flexural cyclic load

Fatigue life and cracking characterization of engineered cementitious composites (ECC) under flexural cyclic load

Carbonation Behavior of Engineered Cementitious Composites under Coupled Sustained Flexural Load and Accelerated Carbonation

Experimental Study on Chloride-Induced Corrosion of Soil Nail with Engineered Cementitious Composites (ECC) Grout

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