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Preparation and Reinforcement Adaptability of Jute Fiber Reinforced magnesium phosphate cement Based Composite Materials

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Journal of Wuhan University of Technology(Materials Science) 2024年第4期39卷 999-1009页

作者：刘芯州郭远臣 WANG Rui XIANG Kai WANG Xue YE Qing College of Civil Engineering Chongqing Three Gorges UniversityChongqing 404100China

To improve the brittleness characteristics of magnesium phosphate cement-based materials(MPC)and to promote its promotion and application in the field of structural reinforcement and repair,this study aimed to increase the toughness of MPC by adding jute fiber,explore the effects of different amounts of jute fiber on the working and mechanical properties of MPC,and prepare jute fiber reinforced magnesium phosphate cement-based materials(JFRMPC)to reinforce damaged *** improvement effect of beam performance before and after reinforcement was compared,and the strengthening and toughening mechanisms of jute fiber on MPC were explored through microscopic *** experimental results show that,as the content of jute fiber(JF)increases,the fluidity and setting time of MPC decrease continuously;When the content of jute fiber is 0.8%,the compressive strength,flexural strength,and bonding strength of MPC at 28 days reach their maximum values,which are increased by 18.0%,20.5%,and 22.6%compared to those of M0,*** beam strengthened with JFRMPC can withstand greater deformation,with a deflection of 2.3 times that of the unreinforced beam at *** strain of the steel bar is greatly reduced,and the initial crack and failure loads of the reinforced beam are increased by 192.1%and 16.1%,respectively,compared to those of the unreinforced *** JF added to the MPC matrix dissipates energy through tensile fracture and debonding pull-out,slowing down stress concentration and inhibiting the free development of cracks in the matrix,enabling JFRMPC to exhibit higher strength and better *** JF does not cause the hydration of MPC to generate new compounds but reduces the amount of hydration products generated.

关键词： magnesium phosphate cement jute fiber reinforcement of damaged beam flexural behavior

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Study of interfacial transition zones between magnesium phosphate cement and Portland cement concrete pavement

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第3期11卷 523-537页

作者： Fei Liu Baofeng Pan Changjun Zhou Ge Li Xiaocun Wang Jiaquan Li Faculty of Infrastructure Engineering Dalian University of TechnologyDalian 116024China Tongren City Transportation Bureau Tongren 554300China Beijing Civil Aviation Design and Research Institute of China Design Group Beijing 101318China

The Portland cement concrete pavement(PCCP)often suffers from different environmental distresses and vehicle load failure,resulting in slab corner fractures,potholes,and other *** repair has become one of the effective ways to open traffic *** this study,a novel type of rapid repair material,basalt fiber reinforced polymer modified magnesium phosphate cement(BFPMPC),is used to rapidly repair ***,the mechanical properties and characteristics of the repair interfaces which are named interfacial transition zones(ITZs)formed by BFPMPC and cement concrete are focused on as a decisive factor for the performance of the rapid *** changing trend of the elastic moduli was studied by nanoindentation experiments in the ITZs with the deconvolution analysis that the elastic moduli of certain kinds of substances can be *** experimental results show that the elastic modulus of ITZ-1 with a width of about20μm can be regarded as 0.098 times of the aggregate,and 0.51 times of the ordinary Portland cement(OPC)*** BFPMPC-OPC mortar ITZ has roughly the same mechanical properties as the ITZ between aggregate and BFPMPC.A multi-scale representative two-dimensional model was established by random aggregate and a two-dimensional extended finite element method(XFEM)to study the mechanical properties of the repair *** simulation results show that the ITZ formed by the interface of BFPMPC and OPC mortar and basalt aggregate is the most vulnerable to failure,which is consistent with the nano-indentation experimental results.

关键词： Portland cement concrete pavement Interfacial transition zone magnesium phosphate cement Repair interface Nanoindentation Mechanical properties and characteristics

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Effect of raw materials and proportion on mechanical properties of magnesium phosphate cement

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Journal of Road Engineering 2022年第3期2卷 243-251页

作者： Yangzezhi Zheng Yang Zhou Xiaoming Huang Haoyuan Luo School of Transportation Southeast UniversityNanjing 211189China National Demonstration Center for Experimental Education of Road and Traffic Engineering Southeast UniversityNanjing 211189China School of Materials Science and Engineering Southeast UniversityNanjing 211189China State Key Laboratory of High Performance Civil Engineering Materials Jiangsu Research Institute of Building Science Co.Nanjing 211103China

magnesium phosphate cement (MPC) cementitious material is a phosphate cement-based material with strengthformed by a serious of acid-base neutralization reactions among magnesium oxide, phosphate retarder and water,which has a high early strength and a broad application prospect in the field of pavement rehabilitation. Thisreview collects and organizes the latest progress in the field of research on the influencing factors of mechanicalproperties of magnesium phosphate cementitious materials worldwide in recent years, and discusses the possibilitiesof application in airport *** type of phosphate has a great influence on the reaction products, and the strength of the reaction productsof ammonium salt is higher. Borax is the most commonly used retarder, and the retarding effect is related to theratio of boron to magnesium. However, borax retarders have an adverse effect on the strength of MPC. In terms ofthe influence of mineral admixtures on the properties of MPC, fly ash, silica fume and metakaolin, as commonmineral admixtures, have a positive influence on the mechanical properties of MPC, but the mechanism anddegree of the influence of the three materials on the strength of MPC are slightly different;Aggregates can alsoimprove the volume stability and mechanical properties of MPC by forming skeleton structure and slowing downthe exothermic reaction. In fiber reinforced MPC matrix, steel fiber is the most widely used and the bondingperformance between special-shaped steel fiber and MPC matrix is higher than that of straight fiber;basalt fiberhas also been proved to be used to improve the mechanical properties of MPC system.

关键词： magnesium phosphate cement Mechanical properties Proportion of mixture Fiber reinforcement

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Enhancing the mechanical properties and cytocompatibility of magnesium potassium phosphate cement by incorporating oxygen-carboxymethyl chitosan

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Regenerative Biomaterials 2021年第1期8卷 92-101页

作者： Changtian Gong Shuo Fang Kezhou Xia Jingteng Chen Liangyu Guo Weichun Guo Department of Orthopedics Renmin Hospital of Wuhan UniversitWuhan 430060China

Incorporating bioactive substances into synthetic bioceramic scaffolds is *** this work,oxygen-carboxymethyl chitosan(0-CMC),a natural biopolymer that is nontoxic,biodegradable and biocompatible,was introduced into magnesium potassium phosphate cement(K-struvite)to enhance its mechanical properties and *** study aimed to develop 0-CMC/magnesium potassium phosphate composite bone cement(OMPC),thereby combining the opti-mum bioactivity of O-CMC with the extraordinary self setting properties and mechanical intensity of the *** results indicated that O-CMC incorporation increased the compressive strength and setting time of K-struvite and decreased its porosity and pH ***,OMPC scaffolds remarkably improved the proliferation,adhesion and osteogenesis related differ-entiation of MC3T3-E1 ***,O-CMC introduced suitable physicochemical properties to K-struvite and enhanced its cytocompatibility for use in bone regeneration.

关键词： magnesium phosphate cement oxygen-carboxymethyl chitos an physic ochemic al properties cytocompatility

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Carboxymethyl chitosan-alginate enhances bone repair effects of magnesium phosphate bone cement by activating the FAK-Wnt pathway

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Bioactive Materials 2023年第2期20卷 598-609页

作者： Ling Yu Tian Gao Wei Li Jian Yang Yinchu Liu Yanan Zhao Ping He Xuefeng Li Weichun Guo Zhengfu Fan Honglian Dai Department of Orthopedic Surgery I(Spine Surgery) Renmin Hospital of Wuhan UniversityWuhan430060China Department of Bone and Soft Tissue Tumor Key Laboratory of Carcinogenesis and Translational ResearchMinistry of EducationPeking University Cancer Hospital&InstituteBeijing100000China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Biomedical Materials and Engineering Research Center of Hubei ProvinceWuhan University of TechnologyWuhan430070China Department of Orthopedic Surgery Renmin Hospital of ShayangJingmen448200China

There is a continuing need for artificial bone substitutes for bone repair and reconstruction,magnesium phosphate bone cement(MPC)has exceptional degradable properties and exhibits promising ***,its mechanical strength needs improved and its low osteo-inductive potential limits its therapeutic application in bone *** functionally modified MPC by using a polymeric carboxymethyl chitosan-sodium alginate(CMCS/SA)gel *** had the advantages of:improved compressive strength,ease of handling,and an optimized interface for bioactive bone *** new composites with 2%CMCS/SA showed the most favorable physicochemical properties,including mechanical strength,wash-out resistance,setting time,injectable time and heat ***,the composite promoted the attachment and proliferation of osteoblast *** was also found to induce osteogenic differentiation in vitro,as verified by expression of osteogenic *** terms of molecular mechanisms,data showed that new bone cement activated the Wnt pathway through inhibition of the phosphorylation ofβ-catenin,which is dependent on focal adhesion *** micro-computed tomography and histological analysis,we found that the MPC-CMCS/SA scaffolds,compared with MPC alone,showed increased bone regeneration in a rat calvarial defect ***,our study suggested that the novel composite had potential to help repair critical bone defects in clinical practice.

关键词： Critical bone defect magnesium phosphate cement Carboxymethyl chitosan Sodium alginate Osteogenic differentiation

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The Effect of Phosphatic Composite on magnesium phosphate cement Performance

The Effect of Phosphatic Composite on Magnesium Phosphate Ce...

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2014中国功能材料科技与产业高层论坛

作者： Zhao-qing Qi Hong-tao Wang Jun-liang Dang Shi-hao Zhang Jian-hua Ding Det.of Chemical & Material Engineering LogisticalEngineering University Det.of Military Civil Engineering Logistical Engineering University

The capacity of 10%,30%,and 50%ammonium dihydrogen phosphate were replaced with an equal amount of three phosphate(potassium dihydrogen phosphate,sodium dihydrogen phosphate,disodium hydrogen phosphate)*** phosphate cement was made by phosphate of replaced,which strength,setting time,fluidity,hydration temperature,and the hydration products was *** results show that:MPC was made that replaced with the equal amount of three kind of phosphate,which has good mechanical *** time and fluidity change along with the *** of phosphate replace ammonium dihydrogen phosphate,which change the hydration process of *** ammonium dihydrogen phosphate was replaced by an equal amount of disodium hydrogen phosphate,the temperature of hydration is only 69.4℃.XRD showed that the diffraction peaks of composite’s magnesium phosphate cement increases.

关键词： magnesium phosphate cement Strength Setting time Fluidity Hydration

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The Comparative Study of Gelatin/CNT-contained Mg-Ca-P Bone cement with the Plain and CNT-reinforced Ones

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Journal of Bionic Engineering 2021年第3期18卷 623-636页

作者： Mohammad Hossein Esnaashary Masoud Karfarma Hamid Reza Rezaie Alireza Khavandi Jafar Javadpour School of Metallurgical and Materials Engineering Iran University of Science and TechnologyNarmakTehran16844Iran

Mimicking compositional and constructional features of the extracellular matrix(ECM)is an effective parameter in improving the biological response of *** this regard,carbon nanotube(CNT)and gelatin were added to magnesium-calcium phosphate cement(CNG)to mimic fibrillar construction and organic composition of ECM,respectively,besides the CNG performance was compared with the plain and CNT-reinforced *** behavior of the cements was investigated by evaluating their setting time,cement composition variation during setting,and viscosity ***,compressive strength,degradation,and cell response of the cements were *** 5 wt.%gelatin reduced setting time about 60%,because of gel formation,not due to struvite ***,the gelatin decreased compressive strength by about 20%.Although gelatin decreased compressive strength,the strength remained in the range attributed to trabecular *** the types of cement indicated shear thinning behavior that made their injectability *** to other types of cement,CNG enhanced proliferation and differentiation of mesenchymal stem cells besides faster degradation,nontoxicity and suitable cell ***,mimicking features of CNG enhanced osteoconductivity and osteoinductivity of the cement compared to the plain one.

关键词： magnesium phosphate cement gelatin carbon nanotube bone mimicking cell response bone cement biomaterials

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