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Influence of steel corrosion to flexural behavior of coral aggregate concrete beam

钢筋锈蚀对珊瑚混凝土梁抗弯性能的影响

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Abstract

To study the flexural behavior and calculation model, 8 coral aggregate concrete (CAC) beams with different types of steel were designed. The flexural behavior of CAC beam was tested. The failure mode, bearing capacity, the maximum crack width (ws) and average crack spacing (lm) were studied. A calculation model for the bearing capacity of CAC beam was proposed. The results indicated that with the steel strength increased, the cracking moment (Mcr) and ultimate moment (Mu) of CAC beam increased, and the development of the ws gradually slowed, which effectively inhibited the formation of cracks and improved the flexural behavior of CAC beam. For CAC structures in the ocean engineering, it is recommended to use organic new coated steel to extend its effective service life. In addition, considering the influence of steel corrosion, a calculation model for the Mcr, Mu, lm and ws of CAC beam was established.

摘要

本文研究了钢筋锈蚀对珊瑚混凝土(CAC)梁抗弯性能的影响. 首先, 对 8 根不同种类钢筋的 CAC 梁进行抗弯性能试验, 研究其破坏机理及承载能力. 结果显示: CAC 梁的抗弯性能随着钢筋强度的提高而增强. 此外, 由于珊瑚骨料和海水中含有大量 Cl−, 使得 CAC 梁中的普通钢筋极易发生锈蚀. 因此, 对于岛礁工程, 采用有机新涂层钢筋能延长 CAC 结构的有效服役寿命. 最后, 考虑钢筋锈蚀的影响, 建立了 CAC 梁的开裂弯矩(Mcr)、 极限弯矩(Mu)、 平均裂缝间距(lm)和最大裂缝宽度(ws)的计算模型.

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Abbreviations

CAC:

Coral aggregate concrete

OAC:

Ordinary aggregate concrete

LAC:

Lightweight aggregate concrete

SG:

Slag

FA:

Fly ash

LPR:

Linear polarization resistance

EIS:

Electrochemical impedance spectroscopy

R p :

Polarization resistance

f y :

Yield strength of steel

f u :

Ultimate strength of steel

f cu :

Cube compressive strength of concrete

f c :

Axial tensile strength of concrete

f tk :

Tensile strength of concrete

f cm :

Flexural compressive strength of concrete

w s :

Maximum crack width

l m :

Average crack spacing

M cr :

Cracking moment

M u :

Ultimate moment

W o :

Elastic resistance moment

h x :

Section height of beam

π:

Steel ratio

ωsm :

Maximum section loss rate

ωs :

ean section loss rate

ω:

Mass loss rate α, α2, α3 Reduction coefficient

I 0 :

Inertia moment

ψ:

Influence coefficient

b :

Section width

y o :

Height of compression zone

h 0 :

Section effective height

n :

Ratio of elastic modulus

A s :

Steel sectional area in the tension zone

x :

Height in the compression zone

αc :

Crack width influence coefficient

c s :

Concrete cover thickness

Π:

Non-uniform coefficient of steel

d ep :

Steel equivalent diameter

σs :

Stress of steel

A te :

Section area of concrete

E s :

Elastic modulus of steel

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Authors and Affiliations

  1. Key Laboratory of Coastal Disaster and Defence of Ministry of Education, Hohai University, Nanjing, 210098, China

    Bo Da  (达波)

  2. College of Harbour, Coastal and Offshort Engineering, Hohai University, Nanjing, 210098, China

    Bo Da  (达波)

  3. Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Hong-fa Yu  (余红发), Hai-yan Ma  (麻海燕) & Zhang-yu Wu  (吴彰钰)

Authors
  1. Bo Da  (达波)
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  2. Hong-fa Yu  (余红发)
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  3. Hai-yan Ma  (麻海燕)
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  4. Zhang-yu Wu  (吴彰钰)
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Corresponding authors

Correspondence to Hong-fa Yu  (余红发) or Hai-yan Ma  (麻海燕).

Additional information

Foundation item: Projects(11832013, 51878350) supported by the National Natural Science Foundation of China; Project(B200201063) supported by the Fundamental Research Funds for the Central Universities, China; Project(BK20180433) supported by the Natural Science Foundation of Jiangsu Province, China

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Da, B., Yu, Hf., Ma, Hy. et al. Influence of steel corrosion to flexural behavior of coral aggregate concrete beam. J. Cent. South Univ. 27, 1530–1542 (2020). https://doi.org/10.1007/s11771-020-4388-9

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  • DOI: https://doi.org/10.1007/s11771-020-4388-9

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