Deterioration of concrete fracture toughness and elastic modulus under simulated acid-sulfate environment

Zhou, Changlin; Zhu, Zhixue; Wang, Zhihong; Qiu, Hao

doi:10.1016/j.conbuildmat.2018.05.049

Cited by 42 publications

(17 citation statements)

References 23 publications

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“…The significant influence of H + (dissolving erosion) and SO 4 2-(expanding erosion) contained in AR on the erosion, appearance and strength of cementitious materials has previously been manifested [14,20]. The degradation of the mechanical properties of the concrete (compressive strength, fracture toughness, modulus of elasticity, tensile properties) by AR has also been demonstrated [21][22][23]. Amongst the various methods applied to protect reinforced concrete against corrosion (corrosion inhibitors, epoxy coatings, steel galvanizing, industrial by-products and waste), the partial replacement of OPC with fly ash (FA) is a relatively inexpensive and ecological method [24,25], whilst causing a reduction of the unit cost of concrete [26].…”

Section: Introductionmentioning

confidence: 99%

Effect of fly ash on the corrosion performance and structural integrity of stainless steel concrete rebars in acid rain and saline environments

Lekatou

Tsouli

Nikolaidis

et al. 2019

Frattura Ed Integrità Strutturale

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The corrosion behavior of 304L stainless steel rebars in an alkaline solution simulating new concrete subjected to acid rain attack and a mildly to slightly acidic solution simulating corroded cover concrete that exposed the reinforcement to direct acid rain attack, was investigated by reverse polarization. Both solutions contained Ca(OH)2 and fly ash (0-25 wt.% of the dry mixture). Concrete cubes containing 0-25 wt.% fly ash and reinforced with 304L rebars were subjected to salt spraying for 4 m. Although the polarization behaviors in the two electrolytes were different, the relative trends with respect to the fly ash contents were similar. The beneficial effect of fly ash (up to 20 wt.%) on the corrosion resistance of 304L rebars was demonstrated. However, a deteriorating effect was realized at 25 wt.% addition. Partial replacement of cement by fly ash did not significantly affect the tensile properties of the 304L rebar before or after 4 m of salt spraying. The elastic modulus and percent elongation presented a slight decrease after 4 m of salt spraying, irrespectively of FA content. Corrosion-wise, 304L can replace 316L stainless steel provided that FA has been added to the concrete mixture, even at low contents (10 or 15 wt.%).

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Section: Introductionmentioning

confidence: 99%

Effect of fly ash on the corrosion performance and structural integrity of stainless steel concrete rebars in acid rain and saline environments

Lekatou

Tsouli

Nikolaidis

et al. 2019

Frattura Ed Integrità Strutturale

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“…Over time, the reliability of an RC structure in an acid rain environment gradually decreases; hence, it is of great importance to conduct in-depth and systematic research on the seismic behaviours of RC structures exposed to acid rain. e influence of acid rain on the material-level behaviours of concrete has been a popular issue for the past few years, including studies on surface morphology [9], corrosion mechanism [10][11][12][13], damage testing method [6], compressive strength [6,14], elastic modulus, and fracture toughness [15,16]. Hill et al [9] reported that spalling and crushing of concrete cube specimens caused by sulfate and acid exposure initially appeared at the corners and edges of the specimens.…”

Section: Introductionmentioning

confidence: 99%

“…Zha and Lu [14] investigated the differentiae, on account of experimental research, in the compressive strengths of ordinary Portland concrete and recycled concrete under artificial acid rain exposure. Under the action of a simulated acid rain exposure, significant variations occurred in the physical and chemical properties of the concrete material, resulting in a corresponding reduction in fracture toughness and elastic modulus, and the lower the pH value, the faster the degradation rate [15,16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Seismic Behaviours of Reinforced Concrete Columns under Simulated Acid Rain Environment

Zheng

Zhang

et al. 2020

Advances in Civil Engineering

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e purpose of this paper was to systematically investigate the influence of acid rain environments on the seismic behaviour of a reinforced concrete (RC) column. Six RC column specimens with shear span ratios of 2.84 were tested under low cyclic reversed loads after being subjected to accelerated corrosion tests in an artificial climate. e corrosion level and stirrup ratio were used as the control variables. e corrosion ratios of the longitudinal rebars ranged from 0 to 13.17%, and the corrosion ratios of the stirrups varied from 0 to 6.75%. e seismic behaviours of the column specimens were analysed with respect to visual damage, failure mode, hysteresis behaviour, load-carrying capacity, deformation capacity, stiffness degradation, and energy dissipation behaviour. e test results showed that the appearance characteristics of the six column specimens exhibited varying degrees of visual damage as a result of the simulated acid rain exposure. All six specimens were dominated by similar flexural-shear failures under low cyclic reversed loads, regardless of the distinctions in the corrosion levels or stirrup ratios. For the specimens with the same ratios of stirrup, as the corrosion level increased, the load-carrying capacity, deformation capacity, stiffness, and energy dissipation capacity were continuously decreased. For the specimens with the same levels of corrosion, the higher the stirrup ratio was, the stronger the restraint effect of the stirrups on the concrete, and the seismic behaviours of the specimens were obviously improved.

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“…As one of the most used building material, concrete is inevitably exposed to different acidic substances and from this point of view the durability of concrete structures in aggressive environments has become a major concern over the past several decades [1][2][3]. Suitable compressive strength, large resources of concrete components and cost effectiveness are concrete characteristics that are desirable for various applications [4,5].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of concrete deterioration under simulated acid rain environment

Smolakova

Estokova

2019

Selected Scientific Papers - Journal of Civil Engineering

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Acid rain is identified as one of the most serious environmental problems nowadays and it is mainly a mixture of sulfuric and nitric acids. Deterioration of concrete structures exposed to aggressive acid rain attack is a key durability issue that affects the performance and maintenance costs of vital civil infrastructures. The motivation for understanding the acid rain corrosion process is high because of the early age deterioration of many concrete structures exposed to acid rain. The main objective of this study was to investigate the durability of concrete specimens with different supplementary cementitious materials, such as fly ash, zeolite and blast furnace slag against acid rain attack. Experiments of acid rain simulation influence on the composites were carried out for 7 weeks and parameters like visual changes, absorbability and leachability of calcium and silicon ions were evaluated. The increase in absorbability was detected for all samples while the sample with blast furnace slag was identified to be the most durable in this point of view. The most durable sample considering leached-out calcium and silicon ions was found to be sample with fly ash.

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Deterioration of concrete fracture toughness and elastic modulus under simulated acid-sulfate environment

Cited by 42 publications

References 23 publications

Effect of fly ash on the corrosion performance and structural integrity of stainless steel concrete rebars in acid rain and saline environments

Effect of fly ash on the corrosion performance and structural integrity of stainless steel concrete rebars in acid rain and saline environments

Experimental Investigation on Seismic Behaviours of Reinforced Concrete Columns under Simulated Acid Rain Environment

Evaluation of concrete deterioration under simulated acid rain environment

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