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Reliability Analysis of Reinforcement Based on GM(1,1)-Markov Semi-immersion Test

Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1177-1187页

作者： FU Yong qiao hongxia HAKUZWEYEZU Theogene School of Civil Engineering Lanzhou University of TechnologyLanzhou 730050China Gansu Advanced Civil Engineering Materials Engineering Research Center Lanzhou 730050China State Key Laboratory of Geomechanics and Geotechnical Enginering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China Civil Engineering Department University of Chinese Academy of SciencesBeijing 100049China

To investigate the corrosion degradation law and service life of reinforced concrete in various salt solution environments,reinforced concrete specimens were semi-immersed in 3%Na_(2)CO_(3)(N3-0-0),3%Na_(2)CO_(3)+3%NaCl(N3-Cl3-0)and 3%Na_(2)CO_(3)+3%NaCl+3%Na_(2)SO_(4)(N3-Cl3-S3)salt *** electrochemical workstation was used for regular non-destructive testing,and the polarization curve and related electrochemical parameters were used as the macroscopic durability evaluation indicators,while microscopic analysis of steel bar corrosion products was performed in combination with SEM and *** addition,the corrosion current density degradation model of GM(1,1)was established and compared with the modified GM(1,1)-Markov degradation *** results showed that the prediction error of the GM(1,1)-Markov model was smaller and more accurate than that of GM(1,1).The reinforced concrete specimens in the N3-0-0,N3-Cl3-0 and N3-Cl3-S3 solutions reached the failure state in 3.08,1.67,and 2.30 years,respectively,as predicted by the GM(1,1)-Markov *** to ESM and EDS microscopic analysis of reinforcement,carbonate had no significant effect on reinforcement corrosion,chloride ions played a dominant role in reinforcement corrosion,and sulfate ion improved concrete's resistance to chloride ion *** on GM(1,1)-Markov model,the failure and damage of reinforced concrete in saline soil areas can be quantitatively evaluated in the whole life cycle,which provides a theoretical basis for the early maintenance or reinforcing of reinforced concrete.

关键词： salt solution semi-immersion corrosion current density GM(1,1)-Markov

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Composites Based on GM(1,1)-Markov in the Salt Spray Corrosion Environment

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Journal of Renewable Materials 2022年第11期10卷 2973-2987页

作者： Jianqiao Yu hongxia qiao Theogene Hakuzweyezu Feifei Zhu School of Civil Engineering Lanzhou University of TechnologyLanzhou730050China Western Ministry of Civil Engineering Disaster Prevention and Mitigation Engineering Research Center Lanzhou University of TechnologyLanzhou730050China

This study was designed to solve the problem of magnesium hazards due to potash extraction in the salt lake *** basalt fiber(BF)as the reinforcement material and magnesium oxychloride cement(MOC)as the gelling material,a BF/MOC composite material was ***,the effect of BF addition content on the basic mechanical properties of the composites was ***,through the salt spray corrosion test,the durability damage deterioration evaluation analysis was carried out from both macroscopic and microscopic aspects using mass change,relative dynamic modulus of elasticity(RDME)change,SEM analysis and FT-IR ***,a GM(1,1)-Markov model was established to predict the durability life of composite materials by using durability evaluation *** results show that:when the BF content is 0.10%(by volumetric content),the composites have the best mechanical properties and resistance to salt spray ***,when the volume of BF content exceeds 0.10%,a large number of magnesium salt crystallization products are observed from the microscopic point of view,and the corrosion of the main strength phase of MOC is more *** prediction results of the GM(1,1)-Markov model are highly identical with the raw *** addition,using the change of RDME as a predictor,RDME is more sensitive to environmental factor compared to the change of *** using the change of RDME as a threshold indicate that MOC-BF0.10 has the longest durability life,which is 836 *** model is important to promote the application of MOC composites in the salt lake region and to promote the healthy development of green building materials.

关键词： Basalt fiber magnesium oxychloride cement salt spray corrosion test durability damage deterioration GM(1,1)-Markov model

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Analysis of Sulfate Corrosion Resistance and Reliability of Recycled Concrete

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Wuhan University Journal of Natural Sciences 2020年第3期25卷 208-216页

作者： qiao hongxia ZHU Xiangchen CHEN Kefan PENG Kuan College of Civil Engineering Lanzhou University of TechnologyLanzhou 730000GansuChina

In order to study the effect of different recycled fine aggregate and recycled coarse aggregate substitution rate on the sulfate resistance of recycled concrete under dry-wet cycle conditions,the substitution rate of recycled fine aggregate and recycled coarse aggregate was designed to be 0%/0%,10%/0%,0%/25%,10%/25%,0%/50%and 10%/50%of the six groups of mixture *** mass loss rate and relative dynamic modulus of each group of test blocks were tested respectively and the optimal ratio was *** Wiener distribution probability method was used to establish the reliability function to optimize the remaining life of the *** results show that the dynamic elastic modulus and mass show a trend of increasing first and then decreasing during the dry-wet cycles of *** recycled concrete has the strongest resistance to sulfate attack under the substitution rate of recycled fine aggregate and recycled coarse aggregate is 10%and 0%,and the test blocks will be damaged after being subjected to 182 times of dry-wet cycles of *** effect of recycled coarse aggregate on the sulfate attack resistance of the test block is more obvious than that of the recycled fine aggregate,which leads to the durability of the concrete being greatly reduced.

关键词： recycled concrete dry-wet cycles of sulfate the Wiener distribution probability microscopic reaction mechanism

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Accelerated Deterioration Mechanism and Reliability Evaluation of Concrete in Saline Soil Area

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Journal of Wuhan University of Technology(Materials Science) 2023年第3期38卷 582-590页

作者：付勇乔宏霞 HAKUZWEYEZU Theogene qiao Guobin GUO Fei School of Civil Engineering Lanzhou University of TechnologyLanzhou 730050China Western Civil Engineering Disaster Prevention and Mitigation Engineering Research Center Ministry of EducationLanzhou University of TechnologyLanzhou 730050China

To reveal the deterioration mechanism and service life of concrete durability in the western saline soil area,the indoor accelerated test of the concrete specimen was simulated in the coupled environment of salt erosion and dry-wet cycles in the west saline soil area of *** deterioration mechanism of concrete durability was revealed through the relative dynamic elastic modulus,relative quality evaluation parameters,SEM,and XRD evaluation *** Wiener distribution function was used for modeling life *** results show that the relative dynamic elastic modulus evaluation parameter as an evaluation index of concrete durability under various environmental coupling effects is more reliable than the relative quality,there were holes and cracks in the concrete,and needle-like and layered crystals grow from the internal *** corrosion products include ettringite,gypsum and other expansive crystals and non-gelling Mg(OH)_(2);the expansion stress caused by physical,chemical reaction,and temperature change under the action of drywet cycle aggravates the formation and development of *** random Wiener distribution function can describe the degradation process of concrete specimen durability,and the established concrete reliability function can intuitively reflect the service life of concrete specimens.

关键词： concrete saline soil area service prediction random wiener durability deterioration mechanism

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Frost Resistance of Pervious Concrete Mixed with Waste Glass Powder

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Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1325-1336页

作者： AN Baofeng LI Qiong qiao hongxia SU Rui WANG Xi WANG Chaoqun JIAO Daowei School of Civil Engineering Lanzhou University of TechnologyLanzhou 730050China Gansu Advanced Civil Engineering Materials Engineering Research Center Lanzhou 730050China China Construction First Group The Fifth Construction Co.Ltd Beijing 100000China

The contents of waste glass powder(WGP)(0%,10%,15%,20%,25%)and water-binder ratio(W/C)(0.24,0.26,0.28)were used as influencing factors,and the quality loss rate(Δm)and compressive strength loss rate(Δfc)were used as characterization *** Ca/Si ratio and main element contents of C-S-H gels with different WGP content were investigated by energy dispersive spectrometry(EDS).The pore structure evolution characteristics of WGP composite cementing materials were investigated by low field nuclear magnetic resonance(NMR).UsingΔfc as the index of frost resistance degradation and Weibull function,the frost resistance degradation of glass doped pervious concrete(WGP-PC)was *** results show that,with WGP,for the same number of cycles,Δm andΔfc decrease and increase with the increase of *** the same WGP content,Δm andΔfc decrease first and then increase with the increase of W/*** 100 freeze-thaw cycles,the samples with WGP content of 20%and W/C of 0.26 have the best *** tests show that with the increase of WGP content,the Ca/Si ratio of C-S-H gel decreases at first and then increases with the increase of WGP *** extreme value of Ca/Si is 2.36 when WGP is added by 20%.The pore volume of hardened paste with 20%WGP content decreased by 18.6%compared with that of cement system without *** overall compactness of the specimen was *** the basis of the test data,a life prediction model was established according to Weibull *** experiment showed thatΔfc could be used as a durability degradation index,and the slope of the reliability curve became gentle after WGP was added,which reduced the damage degradation rate of PC.W/C was ***'s about 5000 hours.

关键词： pervious concrete glass powder frost resistance energy dispersive analysis test low field nuclear magnetic resonance instrument life prediction

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Frost Resistance of Magnesium Oxychloride Cement Mortar Added with Highland Barley Straw Ash

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Journal of Wuhan University of Technology(Materials Science) 2022年第5期37卷 912-921页

作者： CAO Feng qiao hongxia WANG Penghui LI Weijia LI Yuanke School of Civil Engineering Lanzhou University of TechnologyLanzhou730050China School of Civil and Transportation Engineering Qinghai Minzu UniversityXining810000China Western Center of Disaste Mitigation in Civil Engineering of Ministry of Education Lanzhou730050China

In order to study the influence of highland barley straw ash (HBSA) prepared under certain conditions on the durability of magnesium oxychloride cement mortar (MOCM) under freeze-thaw damage,rapid freeze-thaw cycle tests were carried out *** relative mass evaluation parameters and the relative compressive strength evaluation parameters,which represent the degradation of freeze-thaw resistance,were used as the indices to study the degradation rule of ***,nuclear magnetic resonance (NMR) tests were carried out on MOCM under different freeze-thaw cycles to analyze the pore diameter changes in the freeze-thaw *** microstructure of MOCM was tested by Fourier transform infrared spectroscopy (FTIR),X-ray diffraction (XRD) and scanning electron microscopy (SEM),and then the effect mechanism of HBSA on the anti-freezing performance of MOCM was ***,the two-parameter Weibull distribution function was used to analyze the reliability of durability degradation of MOCM added with HBSA under freeze-thaw *** specific conclusions are as follows:With the increase of HBSA's addition,the freeze-thaw resistance of MOCM increase firstly and then *** the addition of HBSA is 10%,the decay rate of relative mass evaluation parameters and relative compressive strength evaluation parameters is the slowest,and the frost resistance is the *** proportion of harmful pores and more harmful pores in MOCM added with 10% HBSA decreases by 25.11% and 21.34%,compared with that without HBSA before and after freeze-thaw cycles.A lot of magnesium silicate hydrate (M-S-H) gels are generated in MOCM with HBSA content of 10%,which fills part of the pores,so that the proportion of harmful pores and more harmful pores is the *** Weibull function can be effectively applied to the reliability analysis of the freeze-thaw cycle of MOCM added with HBSA,and the theoretical results are in good agreement with the experimental results.

关键词： magnesium oxychloride cement highland barley straw ash freeze-thaw resistance pore diameter distribution microstructure reliability

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Effects of Using Municipal Solid Waste Incineration Tailings as Lightweight Aggregate on the Mechanical Properties of Specified Density Concrete

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Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1229-1245页

作者： SHANG Minggang FENG Qiong ZHANG Yunsheng HE Zhongmao qiao hongxia XUE Cuizhen WANG Jinpen HAN Yuehui School of Civil Engineering Lanzhou University of TechnologyLanzhou 730050China Gansu Advanced Civil Engineering Materials Engineering Research Center Lanzhou 730050China College of Science&Technology Ningbo UniversityNingbo 315211China

Municipal solid waste incineration tailings were used as lightweight aggregate(MSWIT-LA)in the preparation of specified density concrete to study the effects on compressive strength,axial compressive strength,flexural strength,microhardness,total number of pores,pore area,and pore *** results showed that the internal curing and morphological effects induced by an appropriate quantity of MSWIT-LA improved the compressive response of specified density concrete specimens,whereas an excessive quantity of MSWIT-LA significantly reduced their mechanical *** analysis of pore structure indicated that the addition of MSWIT-LA increased the total quantity of pores and promoted cement hydration,resulting in a denser microstructure than that of ordinary *** results of a principal component analysis showed that the mechanical response of specified density concrete prepared with 25%MSWIT-LA was superior to that of an equivalent ordinary *** was therefore concluded that MSWIT-LA can be feasibly applied to achieve excellent specified density concrete properties while utilising municipal solid waste incineration tailings to protect the environment and alleviate shortages of sand and gravel resources.

关键词： municipal solid waste incineration tailings X-ray computed tomography lightweight aggregate microhardness principal component analysis

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Evaluation of Corrosion Degradation Law of Recycled Reinforced Concrete in Saline Soil Under Electrified Environment

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Journal of Wuhan University of Technology(Materials Science) 2023年第3期38卷 632-644页

作者：李琼乔宏霞 LI Aoyang School of Civil Engineering Lanzhou University of TechnologyLanzhou 730050China

In order to investigate the corrosion mechanism of recycled reinforced concrete (RRC) under harsh environments,four recycled coarse aggregate (RCA) contents were selected,and saline soil was used as an electrolyte to perform electrified accelerated corrosion *** relative dynamic elastic modulus and relative corrosion current density were considered to describe the deterioration law of the RRC in saline *** results indicated that as the energization time increased,the corrosion current density,corrosion potential,and polarization resistance of the steel bar decreased *** with ordinary reinforced concrete,when the RCA content was 30%,the ability of the RRC to resist corrosion was improved slightly;however,when the RCA content exceeded 30%,the corrosion resistance of the RRC deteriorated *** electron microscopy revealed that for a dense RRC,less corrosion products were generated in the pores inside the concrete and on the surface of the steel bar.X-ray diffraction results indicated that SO_(4)^(2-) can generate ettringite and other corrosion products,along with volume *** main corrosion products generated on the surface of the steel bars included Fe_(2)O_(3),Fe_(3)O_(4) and FeO(OH),which were the corrosion products generated by steel bars under natural ***,using saline soil as an electrolyte is more consistent with the actual service environments of *** the relative dynamic mode and relative corrosion current density of the degradation parameters conform to the Weibull distribution;furthermore,the relative dynamic mode is more sensitive and the corresponding reliability curve can better describe the degradation law of RRC under saline soil environments.

关键词： recycled aggregate concrete corrosion mechanism saline soil accelerated corrosion durability evaluation parameters

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An Experimental Study on Constant Current Load Test of Reinforced Concrete based on 3D Paraffin Isolation

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Journal of Wuhan University of Technology(Materials Science) 2023年第2期38卷 353-365页

作者： SHANG Minggang XUE Cuizhen ZHANG Yunsheng HEZhongmao qiao Honzxin PENG Qiong Theogene Hakuzweyezu HAN Zhao School of Civil Engineering Lanzhou University of TechnologyLanzhou730050China Gansu Advanced Civil Engineering Materials Engineering Research Center Lanzhou730050China College of Science&Technology Ningbo University Ningbo315211China Institute of Rock and Soil Mechanics Chinese Academy of SciencesWuhan430071China

Aiming at the complex corrosion degradation factors of reinforced concrete and clearing the deterioration mechanism in the constant stress state,a new type of constant current accelerated corrosion method in the saline soil environment was *** three-dimensional paraffin isolation specimens and the three-dimensional penetration specimens were taken as the research objects,and the Cl−content and AC impedance Bode diagram were *** macro morphology and micro analysis were also used to evaluate the corrosion degradation laws of the two groups of specimens.A constant current three-factor system accelerated model was established for the current acceleration factor,chloride ion,and sulfate ion acceleration *** experimental results show that,in the constant stress test of the saline soil environmental conditions,the paraffin isolation layer can effectively isolate corrosive chloride ions,which is a brand-new research method of single factor variable control in the constant stress *** to the basic corrosion data,the law of constant current acceleration test is summarized and divided into five corrosion degradation stages,and each stage has significant changes in the accelerated corrosion *** corrosion degradation of a constant stress test is the combined effect of constant current,positive and negative penetration of chloride ions and sulfate ions.

关键词： Cl−content AC impedance constant stress test acceleration factor full factor life cycle

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The Feasibility of Basalt Rock Powder and Superfine Sand as Partial Replacement Materials for Portland Cement and Artificial Sand in Cement Mortar

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Research and Application of Materials Science 2019年第1期1卷 1-9页

作者： hongxia qiao Desire Ndahirwa Yuanke Li Jinke Liang Professor Department of Construction MaterialsSchool of Civil EngineeringLanzhou University of TechnologyKey Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu ProvinceLanzhou 730050China Postgraduate Student Department of Structural EngineeringSchool of Civil EngineeringLanzhou University of TechnologyLanzhou 730050China

The research gap on the feasibility of basalt rock powder(BRP)and superfine sand(SS)in preparation of cement mortar is *** study examines probable changes occurred in the modified cement mortar due to incorporation of certain quantity of basalt rock powder and superfine sand in mixture *** cement mortar included Portland cement,artificial sand and water as principal mixture ***,basalt rock powder and superfine sand were added as partial replacement materials for Portland cement and artificial sand ***,replacement percentages were 10%,15%,20%,25%and 30%when the basalt rock powder replaced Portland cement and in case the artificial sand was replaced by superfine sand,10%,20%,30%,40%and 50%.Then,the strength indexes such as flexural strength,compressive strength,ultrasonic pulse velocity and dynamic elastic modulus were *** results show that the presence of basalt rock powder in mixture proportion increased the flexural and compressive strengths of cement mortar however the cement mortar that contained superfine sand illustrated inadequate mechanical performance as flexural and compressive strengths decreased ***,when basalt rock powder and superfine sand were included together in mixture proportion,the cement mortar’s mechanical performance declined compared to that of the reference cement *** the fact that basalt rock powder and superfine sand weakened the cement mortar’s mechanical properties,it was found that they can be added into the cement mortar as partial replacement of Portland cement and artificial sand in the following ratios:from 10%to 25%when basalt rock powder replaces Portland cement and from 10%to 20%when artificial sand is replaced by superfine sand.

关键词： basalt rock powder superfine sand artificial sand cement mortar mechanical properties

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