Deterioration of compressive property of concrete under simulated acid rain environment

Fan, Yingfang; Hu, Zhiqiang; Zhang, Y.Z.; Liu, J.L.

doi:10.1016/j.conbuildmat.2010.04.002

Cited by 113 publications

(42 citation statements)

References 9 publications

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“…75 -4.60 in 1980s to 4.02 -3.84 in 2005, and the rapid increase of soil pH was most attributed to long-term high atmospheric acid deposition. Physicochemical reactions induced by acid rain in the soil system make the soil structure lose its mechanical strength gradually, resulting in cracking, mass loss, structural failure, and decreases of soil porosity if there is prolonged acid deposition (Fan et al 2010). Thereafter, the oxygen concentration in the soil system will be decreased, forming anaerobic environments that are favorable for SRB.…”

Section: Factors Controlling the Srb Occurrence At Thementioning

confidence: 99%

Molecular distributions of phospholipid ester-linked fatty acids in a soil profile of the Dinghushan Biosphere Reserve

Mao¹,

Sun²,

Zhang³

et al. 2018

Terr. Atmos. Ocean. Sci.

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Phospholipid ester-linked fatty acids (PLFA) were used to investigate the microbial ecology and its association with carbon accumulation in one soil profile from the Dinghushan Biosphere Preserve in south China, in order to probe the mechanisms that control the carbon accumulation at the depth of 0 -20 cm in the Dinghushan forest soil profile. The data show that sulfate reducing bacteria (SRB) occur in the top 10 cm, and methanotrophic bacteria and fungi are not present below 10 cm, and the gramnegative bacteria are reduced with gram-positive bacteria dominating at that depth; all of which indicated that the activities of some of the microorganisms were inhibited, from which we infer that the available carbon source and oxygen content of micro environment may be reduced below 10 cm of the profile. The shallow depth (top 10 cm) of the soil anaerobic zone at the Wukesong profile, compared to the normal soil anaerobic zone (top 20 -30 cm), is considered to be mainly the result of the high precipitation of acidic rain. The physicochemical reactions caused by acid rain in the soil system result in a decreased soil porosity, and a correspondingly decreased porositydependent oxygen concentration, leading to the thriving of SRB in the shallow depth. Although the increase of soil organic carbon stock is attributed to numerous factors, the decreasing rate of litter decomposition in the topsoil layer, together with the rise of the depth of the anaerobic zone, may play key roles in the carbon accumulation in the depth of 0 -20 cm in the soil profile from the Dinghushan Biosphere Preserve.

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Section: Factors Controlling the Srb Occurrence At Thementioning

confidence: 99%

Molecular distributions of phospholipid ester-linked fatty acids in a soil profile of the Dinghushan Biosphere Reserve

Mao¹,

Sun²,

Zhang³

et al. 2018

Terr. Atmos. Ocean. Sci.

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“…According to (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12), we can determine the six parameters of skeleton curve of corroded compression-bending members. e difference of skeleton curve of the damaged and undamaged members is that they have the different the material parameters.…”

Section: Collapsing Shearing Force F Cud and Its Correspondingmentioning

confidence: 99%

“…For example, wind, waves, corrosive environment, and extreme temperatures all can impact the existing structures. During the entire service life of the RC structure, the continuous penetration of harmful ions induces cracking and spalling of the concrete cover [1][2][3], degradation of the bond strength [4][5][6][7], and decrease of the material strength [8][9][10][11][12]. In seismic-prone regions, the corrosion damage of the structures would reduce their lateral load-resisting capacity in a seismic event significantly [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

A Parameter Ascertainment Method for the Skeleton Curve of Corroded Reinforcement Concrete Members with Flexureand Compression

Chen

Zhang

Zhu

2018

Advances in Materials Science and Engineering

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is paper presents an effective method of parameter ascertainment for the skeleton curve of corroded compression-bending members to establish its restoring force model. An assumption which considers the skeleton curve of damaged and undamaged members has similar shape is introduced into the fitting process of parameters. Meanwhile, two-dimensional plane section assumption is used to simplify the mathematical model and reduce the computational cost. Several sets of experimental data were compared with the prediction by the method developed in this paper, for its verification. e case studies show that the experimental trends can be captured very well.

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“…e results indicate that the acid rain attacking is an unceasing dissolution process of hydrating products such as Ca(OH) 2 , C-S-H gel, hydrated calcium aluminate, and hydrated calcium ferrite gel. Fan et al [14] studied the material property of concrete under acid rain environment quantitatively. Results of concrete corrosion depth, mass loss, compressive strength, and elastic modulus were statistically analyzed and modeled.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Physicochemical and Mechanical Properties of Mortar Subjected to Acid Corrosion

Huo

2018

Advances in Materials Science and Engineering

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e 28 days cured cement mortar samples were soaked in HCl (pH � 1 and 2) and H 2 O (pH � 7) solutions for 90 days. By monitoring the ion concentration of H + and Ca 2+ and measuring the changes in weight loss, longitudinal wave velocity, and uniaxial compressive strength values of the corroded mortar, the physicochemical and mechanical properties of the mortar specimens were studied. Experimental results indicate that the process of the mortar sample subjected to HCL erosion has apparent stage characteristics. In the initial stage of corrosion, the chemical reaction increased the porosity of the specimen, which leads to the decrease of longitudinal wave velocity of the samples. At the same time, the corrosion solution continuously penetrates into the mortar pore system, which leads to the increase of the mass, and it is considered that the diffusion process plays a leading role during this period. Moreover, the colloidal compounds generated by the chemical reaction can not only fill the pore space but also block the continuous reaction, which led to the increase of the longitudinal wave velocity of the specimen. With the prolonging of corrosion time and infiltration path, the pH value and the concentration of Ca 2+ tend to be stable, the diffusion action is weakened, and the chemical reaction is continuous, which led to the decrease of the mass and wave velocity gradually. It is considered that the chemical reaction plays a leading role in this process. Based on the induction and analysis of the test results, a generalized porosity model regarding the increase of the porosity and the decrease of effective bearing area of the mortar sample was proposed. e relation between the uniaxial compressive strength and the corrosion time of the corroded mortar is deduced, and the unknown parameters are determined based on the regression analysis of the test data.

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Deterioration of compressive property of concrete under simulated acid rain environment

Cited by 113 publications

References 9 publications

Molecular distributions of phospholipid ester-linked fatty acids in a soil profile of the Dinghushan Biosphere Reserve

Molecular distributions of phospholipid ester-linked fatty acids in a soil profile of the Dinghushan Biosphere Reserve

A Parameter Ascertainment Method for the Skeleton Curve of Corroded Reinforcement Concrete Members with Flexureand Compression

Experimental Study on Physicochemical and Mechanical Properties of Mortar Subjected to Acid Corrosion

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