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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 164-170页

作者： WU Min CAO Kailei XIAO Weirong YU Zetai CAO Jierong DING Qingjun LI Jinhui china Railway construction co.poration Harbour and Channel Engineering Bureau Group co. LTDZhuhai 519000China co.-struction Headquarters of Zhoushan Liuheng Bridge Phase II Project Zhoushan 316000China china Railway construction Bridge En-gineering Bureau Group co. LTDTianjin 300000China State Key Laboratory of Silicate Material for Architecture(Wuhan University of Technology) Wuhan 430070China co.lege of Materials Science and Engineering Wuhan Textile UniversityWuhan 430200China

The paper presents experimental investigation results of crack pattern change in cement pastes caused by external sulfate attack(ESA).To visualize the formation and development of cracks in cement pastes under ESA,an X-ray co.puted tomography(X-ray CT)was used,i e,the tomography system of Zeiss Xradia 510 *** results indicate that X-CT can monitor the development process and distribution characteristics of the internal cracks of cement pastes under ESA with attack *** addition,the C3A co.tent in the cement significantly affects the damage mode of cement paste specimens during sulfate *** damage of ordinary Portland cement(OPC)pastes subjected to sulfate attack with high C3A co.tent are severe,while the damage of sulfate resistant Portland cement(SRPC)pastes is much smaller than that of OPC ***,a quadratic function describes the co.relation between the crack volume fraction and development depth for two cement pastes immermed in sulfate solution.

关键词： concrete external sulfate attack damage evolution situ X-ray co.puted tomography

On the Preparation of Low-Temperature-Rise and Low-Shrinkage concrete Based on Phosphorus Slag

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Fluid Dynamics & Materials Processing 2024年第4期20卷 803-814页

作者： Jianlong Jin Jingjing Ding Long Xiong Ming Bao Peng Zeng china construction ready mixed concrete co. Ltd.Wuhan430000China

The effects of different co.tents of a MgO expansive agent and phosphorus slag on the mechanical properties,shrinkage behavior,and the heat of hydration of concrete were *** slump flow,setting time,dry shrinkage,and hydration heat were used as sensitive parameters to assess the response of the co.sidered *** shown by the results,in general,with an increase in the phosphorus slag co.tent,the hydration heat of concrete decreases for all ages,but the early strength displays a downward trend and the dry shrinkage rate *** 90-d strength and dry shrinkage of concrete co.ld be improved with a phosphorus residue co.tent between 0%-20%,with the best performances in terms of mechanical properties and shrinkage characteristics being achieved for a co.tent of 20 kg/m^(3).On the basis of these results,it can be co.cluded that appropriate amounts of phosphorus slag and MgO expansive agent can be used to improve the co.pressive strength of concrete in the later stage by reducing the hydration heat and dry shrinkage rate,respectively.

关键词： Phosphorus slag MgO expansion agent mass concrete hydration heat

Analysis of a co.posite Admixture Based on ready-mixed concrete Waste Residuals

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Fluid Dynamics & Materials Processing 2023年第8期19卷 1983-1995页

作者： Jinfa Jiang Long Xiong Ming Bao Zihan Zhou Wuhan Energy co.servation Office Wuhan430000China china construction ready mixed concrete co. Ltd.Wuhan430000China

Reasonable treatment and utilization of waste residuals discharged during the production of ready-mixed concrete is an important problem in the cement *** this study,a co.posite admixture was prepared by using ready-mixed concrete waste residuals,furnace slag,and water granulated *** grinding characteristics of such material were ***,the effect of such admixture on cement hydration and pore structure was analyzed by X-ray diffraction,thermogravimetric-differential scanning calorimetry,scanning electron microco.y and mercury intrusion *** shown by the results:The grinding characteristics of the waste residuals can be improved significantly by mixing them with furnace slag and water granulated ***,the co.posite admixture does not change the co.position of hydration products;rather it co.tributes to refine the pore structure of the matrix,thus improving the mechanical properties of these cement-based materials.

关键词： Waste residue of ready-mixed concrete station ready mixed concrete co.posite admixture activity microstructure

Preparation and properties of geopolymer-lightweight aggregate refractory concrete

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Journal of Central South University 2009年第6期16卷 914-918页

作者：胡曙光吴静杨文何永佳王发洲丁庆军 Key Laboratory for Silicate Materials Science and Engineering Ministry of EducationWuhan University of Technology china construction ready mixed concrete co. Ltd.

Geopolymer-lightweight aggregate refractory concrete (GLARC) was prepared with geopolymer and lightweight aggregate. The mechanical property and heat-resistance (950 ℃) of GLARC were investigated. The effects of size of aggregate and mass ratio of geopolymer to aggregate on mechanical and thermal properties were also studied. The results show that the highest co.pressive strength of the heated refractory concrete is 43.3 MPa,and the strength loss is only 42%. The mechanical property and heat-resistance are influenced by the thickness of geopolymer co.ered with aggregate,which can be expressed as the quantity of geopolymer on per surface area of aggregate. In order to show the relationship between the thickness of geopolymer co.ered with aggregate and the thermal property of concrete,equal thickness model is presented,which provides a reference for the mix design of GLARC. For the haydite sand with size of 1.18-4.75 mm,the best amount of geopolymer per surface area of aggregate should be in the range of 0.300-0.500 mg/mm2.

关键词： refractory concrete geopolymer lightweight aggregate thermal property equal thickness model

Bending Stiffness of concrete-Filled Steel Tube and Its Influence on concrete Placement Timing of co.posite Beam-String Structure

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Structural Durability & Health Monitoring 2025年第1期19卷 55-75页

作者： Zhenyu Zhang Quan Jin Haitao Zhang Zhao Liu Yuyang Wu Longfei Zhang Renzhang Yan CCCC Third Highway Engineering co. Ltd.Beijing101300China School of Civil Engineering Chongqing Jiaotong UniversityChongqing400074China

When the upper chord beam of the beam-string structure(BSS)is made of concrete-filled steel tube(CFST),its overall stiffness will change greatly with the construction of concrete placement,which will have an impact on the design of the tensioning plans and selection of co.trol measures for the *** order to accurately obtain the bending stiffness of CFST beam and clarify its impact on the mechanical properties of co.posite BSS during construction,the influence of some factors such as height-width ratio,wall thickness of steel tube,elasticity modulus of concrete,and friction co.fficient on the bending stiffness are analyzed parametrically by the numerical simulation technology based on an actual *** calculation formula of the equivalent bending stiffness of CFST is also established through mathematical statistical ***,the equivalent bending stiffness is introduced into the construction and use stages of the co.posite BSS,respectively,and the mechanical properties such as prestress-tensioning co.trol value,structural deformation,and internal force of key members are co.paratively analyzed when adopting two different construction ***,the optimal construction plan of concrete placement first and then prestress-tensioning is proposed.

关键词： concrete panels freeze-thaw damage co.pression-shear crack tension-shear crack

Synthesis, Properties and Dispersion Mechanism of Sulphonated Acetone-formaldehyde Superplasticizer in Cementitious System

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Journal of Wuhan University of Technology(Materials Science) 2013年第6期28卷 1167-1171页

作者： LIU Ming LEI Jiaheng DU Xiaodi FU Chengfei HUANG Bo School of Materials Science and Engineering Wuhan University of Technology Department of Chemistry School of ScienceWuhan University of Technology china construction ready-mixed concrete co. Ltd.

The synthesis, properties and dispersion mechanism of sulphonated acetone-formaldehyde superplasticizer （SAF） were presented. This superplasticizer was synthesized by the reaction among acetone, formaldehyde, sodium sulfite and pyrosulfite. The structure and property were respectively characterized by IR and surface tension measurement. Performance of SAF in cement was evaluated by paste flow as well as heat calorimetry. The dispersion mechanism was identified via adsorption and zeta potential measurement. The results show that cement paste mixed with SAF shows good fluidity. SAF exerts little retarding effect on cement paste and it behaves like a typical polyco.densate superplasticizer. The main dispersion mechanism of SAF is attributed to electrostatic repulsion.

关键词： sulphonated acetone-formaldehyde superplasticizer dispersion mechanism zeta potential cement paste

Strength and Microstructure of Mortar co.taining Glass Powder and/or Glass Aggregate

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Journal of Wuhan University of Technology(Materials Science) 2016年第6期31卷 1302-1310页

作者：刘数华 WANG Shu ZHOU Wei LI Lihua XIAO Henglin WEI Jianpeng TANG Wan State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan 430072 China china construction ready mixed concrete co. Ltd. Wuhan 430000 China School of Civil Engineering and Architecture Hubei University of Technology Wuhan 430068 China

The co.pressive strength of mortar co.taining glass powder（GP） and/or glass aggregate（GA） was tested, and its microstructure was also studied by thermogravimetric and differential thermal analysis（TG-DTA）, scanning electron microsco.y（SEM）, energy dispersive spectrosco.ic analysis（EDX）, and X-ray diffraction（XRD） techniques. The inco.poration of GA would decrease the co.pressive strength of the mortar in the absence of GP. Inco.porating both GA and GP co.ld change the hydration environment, promote pozzolanic reaction of GP and improve the co.pressive strength. GP does not lead to but can effectively co.trol ASR（Alkali Silica Reaction）. GP and GA do not transform the type of hydrates, but have a great influence on the amounts of hydration products, and generate more calcium silicate hydrate（C-S-H gel） with lower Ca/Si ratio. GP and GA with good gradation will make the microstructure denser.

关键词： glass powder glass aggregate mortar strength microstructure

Effect of co.rosive Ions (Cl^-,SO4^2-,and Mg^2+) on the Nanostructure and Chloride Binding Property of C-A-S-H Gel

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Journal of Wuhan University of Technology(Materials Science) 2020年第6期35卷 1061-1072页

作者： JIN Shucheng LIU Kai ZHANG Gaozhan SHI Hua DING Qingjun XU Wenyuan School of Civil Engineering Northeast Forestry UniversityHarbin 150040China china construction ready mixed concrete co. LtdWuhan 430200China School of Materials and Chemical Engineering Anhui Jianzhu UniversityHefei 230601China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

The nanostructure and chloride binding capacity evolution of C-A-S-H gel exposed to aggressive solutions were investigated,utilizing 29Si NMR,27Al NMR,SEM-EDS,and XRD *** experimental results show that while Cl-ions show a smaller effect on the microstructure of C-A-S-H sample,and SO4^2-ions can react with C-A-S-H,resulting in decreasing Ca/Si and Al[4]/Si for the C-A-S-H gel (i e,decalcification and dealuminization).The presence of Mg^2+ ions can aggravate the decalcifying and dealuminizing effects of SO4^2-ions on the *** decreasing Ca/Si ratio and aluminum substitution for the original C-A-S-H gel,the depolymerization degree of silicate tetrahedra increases and the calcium aluminosilicate skeleton strengthens.C-A-S-H gel with lower Ca/Si ratio and higher Al[4]/Si ratio shows gentler nanostructure evolution under chemical attack,i e,improving thermodynamic stability under chemical ***,the chloride binding capacity of C-A-S-H gel is decreased after the sulfate *** substitution can also help C-A-S-H gel resist the degraded chloride binding capacity induced by sulfate attack.

关键词： calcium-silicate-hydrate ions attack Ca/Si ratio Al/Si aluminum uptake

Abrasion Resistance of Cement Paste with Granulated Blast Furnace Slag and Its Relations to Microhardness and Microstructure

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Journal of Wuhan University of Technology(Materials Science) 2022年第3期37卷 410-415页

作者： CHEN Xiaorun HE Zhen CAI Xinhua ZHAO Rixu HU Lingling CHEN Hongren china West construction Academy of Building Materials Chengdu 610015China china construction ready mixed concrete co. Ltd.Wuhan 430205China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China Shandong Chunhe New Material Research Institute co. Ltd.Rizhao 276800China Hubei(Wuhan)Institute of Explosion Science and Blasting Technology Jianghan UniversityWuhan 430056China

The abrasion resistance of cement pastes with 30 wt%,40 wt%and 50 wt%granulated blast furnace slag(GBFS),and its relations to microhardness and microstructure like hydration products and pore structure were *** indicated that GBFS decreased the abrasion resistance of paste,and among the pastes with GBFS,the paste with 40 wt%GBFS showed the highest abrasion *** microhardness of GBFS was lower than that of the cement,and the microhardness of the hydration products in paste with GBFS was also lower than that of the hydration products in paste without GBFS,so that the abrasion resistance of paste decreased when GBFS was *** reason for the decrease of microhardness of pastes with GBFS was that the co.tents of Ca(OH)_(2)in pastes with GBFS was significantly lower than that in the paste without GBFS,while large amounts of calcium aluminate hydrates and hydrotalcite-like phases(HT)in pastes with GBFS were ***,among the pastes with GBFS,the paste with 40 wt%GBFS showed the lowest porosity which was the main reason for its highest abrasion resistance.

关键词： paste abrasion resistance granulated blast furnace slag microhardness microstructure

Physico.chemical Characteristics of Wet-milled Ultrafine-granulated Phosphorus Slag as a Supplementary Cementitious Material

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Journal of Wuhan University of Technology(Materials Science) 2018年第3期33卷 625-633页

作者：贺行洋 YE Qing YANG Jin DAI Fei SU Ying WANG Yingbin Bohumír Strnadel Building Waterproof Engineering and Technology Research Center of Hubei Province Hubei University of Technology National Enterprise Technology Center China Construction Ready Mixed Concrete Co. Ltd. Center of Advanced and Innovation Technologies Faculty of Metallurgy and Materials Engineering V?B-Technical University of Ostrava

The phosphorus slag（PS） can be used as a supplementary cementitious material due to its potential hydrating activity. However, its usage has been limited by its adverse effects, including prolonged setting and lowered early-stage strength. In this study, we achieved ultrafine granulation of PS using wetmilling（reducing d50 to as low as 2.02 μm） in order to increase its activity, and examined the physico.chemical properties of the resulting materials, including particle-size distribution, slurry pH, zeta potential, and activity index, as well as how their replacement level and granularity affect the setting time and mechanical performance of PS-cement mixture systems. The results suggested that as the granularity increases, there are significant boosts in the uniformity of particle sizes, slurry pH, and activity index, and the effects on cement paste, including setting times, and early-and late-stage strengths, are significantly mitigated. When d（50）=2.02 μm, the slurry beco.es strongly alkaline（pH=12.16） co.pared to the initial d（50）=20.75 μm（pH=9.49）, and the activity is increased by 73%; when used at 40% replacement, the PS-cement mixture system can reach a 28 d co.pressive strength of 93.2 MPa, 36% higher than that of the pure cement co.trol group.

关键词： wet-milling phosphorus slag ultrafine granulation setting time co.pressive strength