This paper proposes an integrated system for monitoring and strengthening the prestressed concrete cylinder pipe(PCCP)with broken wires,which is based on distributed acoustic sensing(DAS)and self-prestressing iron-bas...This paper proposes an integrated system for monitoring and strengthening the prestressed concrete cylinder pipe(PCCP)with broken wires,which is based on distributed acoustic sensing(DAS)and self-prestressing iron-based shape memory alloy(Fe-SMA).This system was evaluated in a full-scale study on a PCCP with an inner diameter of 1400 mm and a length of 6000 mm.Firstly,the wire breakage signals were monitored by the DAS system.After that,the PCCP with broken wires were strengthened by Fe-SMA bars,and the mechanical properties were tested.The parameters such as different wire breakage ratios and self-prestressing degrees of Fe-SMA bars were also studied.The results show that the DAS system can identify the time and location of wire breakage;the wire breakage signal is characterized by high amplitude and short duration.After being prestressed with Fe-SMA bars,both the width and length of the main crack,as well as the strains in the concrete,mortar coating,and prestressed steel wires,significantly decreased.Additionally,the higher activation temperature of Fe-SMA bars can effectively offset the negative impact caused by the wire breakage development of PCCP.Combined Fe-SMA with the DAS monitoring system,it enables precise positioning and efficient strengthening of in-service PCCP with broken wires.展开更多
Subsoiling has been widely used all over the world as an important operation method of no-tillage farming.For energy-saving and life-extension,the tillage resistance and wear-corrosion of subsoilers have attracted wid...Subsoiling has been widely used all over the world as an important operation method of no-tillage farming.For energy-saving and life-extension,the tillage resistance and wear-corrosion of subsoilers have attracted wide attention.In this study,the tillage resistance,soil disturbance,wear and corrosion of subsoiler with S-T-SK-2#biomimetic structures(S means subsoiler;T means tine;SK means shank;2#,h/s=0.57,h=5 mm andα=45°.)and self-healing coating under two seasons,two locations with different soil properties(black loam and clay soil)and subsoiling speeds(2 km/h and 3.6 km/h)were investigated.The soil moisture content and compactness affected the tillage resistance and wear-corrosion.The tillage resistance and degree of corrosion on all subsoilers were much larger in clay soil than that in black loam soil.Compared with S-T-SK-2#,the tillage reduction rate of C-S-T-SK-2#(S-T-SK-2#with self-healing coating)was up to 14.32%in clay soil under the speed of 2 km/h.The significance tests of regression equation results showed that subsoiler type and soil properties had a significant impact on soil disturbance coefficient,swelling of total soil layer,bulkiness of the plough pan.It is of a guiding significance for the analysis of soil disturbance.Synergism mechanism of subsoiler coupling with biomimetic structures and self-healing coating was analyzed in following.It depicted the guiding effect of biomimetic structure and the shield function of self-healing coating,resulting in anticorrosion and wear resistance of subsoiler.展开更多
基金support from the Excellent Youth Foundation of Jiangsu Province of China(Grant No.BK20230088)the National Natural Science Foundation of China(Grant No.52378139)+1 种基金the Fundamental Research Funds for the Central Universities(Grant No.2242022k30031)the SEU Innovation Capability Enhancement Plan for Doctoral Students(Grant No.CXJH_SEU 24112).
文摘This paper proposes an integrated system for monitoring and strengthening the prestressed concrete cylinder pipe(PCCP)with broken wires,which is based on distributed acoustic sensing(DAS)and self-prestressing iron-based shape memory alloy(Fe-SMA).This system was evaluated in a full-scale study on a PCCP with an inner diameter of 1400 mm and a length of 6000 mm.Firstly,the wire breakage signals were monitored by the DAS system.After that,the PCCP with broken wires were strengthened by Fe-SMA bars,and the mechanical properties were tested.The parameters such as different wire breakage ratios and self-prestressing degrees of Fe-SMA bars were also studied.The results show that the DAS system can identify the time and location of wire breakage;the wire breakage signal is characterized by high amplitude and short duration.After being prestressed with Fe-SMA bars,both the width and length of the main crack,as well as the strains in the concrete,mortar coating,and prestressed steel wires,significantly decreased.Additionally,the higher activation temperature of Fe-SMA bars can effectively offset the negative impact caused by the wire breakage development of PCCP.Combined Fe-SMA with the DAS monitoring system,it enables precise positioning and efficient strengthening of in-service PCCP with broken wires.
基金This work was supported by Natural Science Foundation of Zhejiang Province(Grant No.Q23E050025)Huzhou Key Research and Development Project(Grant No.2022ZD2068)+5 种基金Scientific Research Fund of Zhejiang Provincial Education Department(Grant No.Y202145948)Huzhou University School-Level Scientific Research Projects(Grant No.2021XJKJ01)Cross Project of Zhejiang Fubai Material Technology Co.,Ltd(Grant No.HK33176)Cross Project of Zhejiang Aobo Quartz Technology Co.,Ltd(Grant No.HK33312),Zhejiang Province Basic Public Welfare Research Program(Grant No.LGG21E010002)Unveiling the Commander Special Plan for Scientific and Technological Research of Liaoning Province(Grant No.2021JH1/10400039)Science and Technology Research and Industrialization Project of Liaoning Province(Grant No.2020JH2/10200024).
文摘Subsoiling has been widely used all over the world as an important operation method of no-tillage farming.For energy-saving and life-extension,the tillage resistance and wear-corrosion of subsoilers have attracted wide attention.In this study,the tillage resistance,soil disturbance,wear and corrosion of subsoiler with S-T-SK-2#biomimetic structures(S means subsoiler;T means tine;SK means shank;2#,h/s=0.57,h=5 mm andα=45°.)and self-healing coating under two seasons,two locations with different soil properties(black loam and clay soil)and subsoiling speeds(2 km/h and 3.6 km/h)were investigated.The soil moisture content and compactness affected the tillage resistance and wear-corrosion.The tillage resistance and degree of corrosion on all subsoilers were much larger in clay soil than that in black loam soil.Compared with S-T-SK-2#,the tillage reduction rate of C-S-T-SK-2#(S-T-SK-2#with self-healing coating)was up to 14.32%in clay soil under the speed of 2 km/h.The significance tests of regression equation results showed that subsoiler type and soil properties had a significant impact on soil disturbance coefficient,swelling of total soil layer,bulkiness of the plough pan.It is of a guiding significance for the analysis of soil disturbance.Synergism mechanism of subsoiler coupling with biomimetic structures and self-healing coating was analyzed in following.It depicted the guiding effect of biomimetic structure and the shield function of self-healing coating,resulting in anticorrosion and wear resistance of subsoiler.
