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第九届水泥混凝土国际会议

作者： Ge ZHANG Haiyang Yu Yingzi YANG Key Lab of Structures Dynamic Behavior and Control Harbin Institute of TechnologyMinistry of Education School of Civil Engineering Harbin Institute of Technology

Early defonnation of mortars exposed to sub-zero temperature was *** measure the deformation precisely,a self-made defonnation test device which can be used under sub-zero temperature was *** addition,the compressive strength and dynamic modulus of elasticity of mortars exposed to sub-zero temperature were *** results showed that the deformation of mortars exposed to the sub-zero temperature at early age can be considered as 6 *** were plastic settlement stage,frost heaving stage,deformation stabilization stage,positive temperature settlement stage,positive temperature expansion stage,and re-stabilization stage,*** early compressive strength of mortars would be seriously affected by the sub-zero *** once the curing temperature was transformed to the positive temperature,it would develop *** results of the dynamic modulus of elasticity showed that the internal structure can be developed even at the sub-zero temperature,but the early internal structure of mortar would be damaged by the low temperature.

关键词： Sub-zero temperature deformation early age mortar

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An on-site evaluation method for corrosion degradation of in-service cable wires by image histogram matching 11

An on-site evaluation method for corrosion degradation of in...

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11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017

作者： Xu, Yang Li, Shunlong Li, Hui Gu, Chenyu Li, Xinbin Chen, Xiaowei Qiao, Weidong Key Lab of Intelligent Disaster Mitigation Ministry of Industrial and Information Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China School of Transportation Science and Engineering Harbin Institute of Technology Harbin150090 China

ISBN: (纸本)9781605953304

This paper proposes a novel non-destructive method by image histogram matching to evaluate the corrosion degradation of cable wires in service quantitatively. Artificial accelerated salt spray test is adopted to simulate the corrosion environment, and adequate RGB images are taken by a consumer-grade camera to cover the whole information of corroded surface for each specimen under different corrosion periods. Histogram distribution analysis is applied to study the concentrated modes of RGB images, and joint Gaussian distribution is fitted to capture location parameters. Timevariant models of the location parameters are regressed and then the mechanical properties are learnt by tensile and fatigue tests. Once the features of RGB corrosion images of steel wires are matched to the proposed time-variant models, the corresponding corrosion degree and mechanical properties can be estimated. The proposed method is meaningful for the on-site evaluation of cable wires in service with no need to carry on corrosion and mechanical degradation tests after replacing cables.

关键词： Graphic methods

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Pseudo-dynamic testing of a fabricated composite frame with steel plate shear walls

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2017年第6期18卷 454-466页

作者： Zheng-gang CAO Peng DU Feng FAN Zhe-ming CHEN Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China Shanghai Municipal Engineering Design Institute (Group) Co. Ltd Shanghai 200092 China

A pseudo-dynamic testing program was generated on a fabricated composite frame with steel plate shear walls （SPSWs） to study its seismic perlbrmance. The specimen was a three-storey single-bay frame, which was composed of H- section steel columns and composite beams, and was assembled by bolted height-adjustable steel beam-to-column connections （BHA connections）. Beam-only-connected SPSWs were selected as lateral load resisting members. The specimen was subjected to four ground motions of progressively increasing intensity. The results showed that：（1） beam-only-connected S PSWs provided sufficient lateral load resistance, lateral stiffness, and energy dissipation capacity to the fabricated frame via the tension ficld action developed in their infill panels; （2） the fabricated frame, assembled by BHA connections, exhibited substantial redundancy and good ductility; （3） an undesirable failure mode of the fabricated frame, in huge earthquakes, included severe cracking in composite beams and block shear failure in SPSWs＇ connections; （4） the inter-storey shear force distribution determined by ASCE/SE1 7-10 was verified with experimental data.

关键词： Fabricated frame Composite beam Steel plate shear walls Pseudo-dynamic test

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Mechanical properties of steel fiber-reinforced reactive powder concrete at high temperature and after cooling

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Procedia Engineering 2017年 210卷 597-604页

作者： Muhammad Abid Xiaomeng Hou Wenzhong Zheng Ghulam Qadir Waqar Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin 150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China

Reactive powder concrete (RPC) is advanced cement-based material. It is produced through microstructure enhancement technique. Like other types of concretes, RPC has also been affected by severe environmental conditions such as accidental fire. Up to date, very limited research has been carried out to compare the performance of RPC at fire and after cooling. To address this gap in knowledge, the mechanical properties such as compressive strength, split-tensile strength, flexural strength and elastic modulus have been studied at high temperature and after cooling. 72 cubic specimens and 72 prismatic samples were tested. The hot and residual strength results were plotted as a function of temperature. The results indicated a higher residual strength than hot-strength in the temperature range of 20-300℃. Above 300℃, there was no sizable difference between the hot and residual strength of PRC. A comparison has also been made among the test data with current design codes.

关键词： Reactive powder concrete high temperature hot behavior residual behavior mechanical properties

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Evaluation of residual mechanical properties of steel fiber-reinforced reactive powder concrete after exposure to high temperature using nondestructive testing

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Procedia Engineering 2017年 210卷 588-596页

作者： Xiaomeng Hou Muhammad Abid Wenzhong Zheng Ghulam Qadir Waqar Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin 150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China

Reactive powder concrete (RPC) is classified as ultra-high performance concrete, owing to its superior strength, excellent durability and high fracture energy. However, RPC may also be severely affected by devastating fire exposures. This paper presents the variations in residual mechanical properties of RPC after exposure to high temperature. The strength of RPC after cooling was also assessed by nondestructive tests (NDTs). The ultrasonic pulse velocity (UPV) method and resonance frequency (RF) method were used. The samples were subjected to the target temperature of 120℃, 300℃, 500℃, 700℃ and 900℃. The heating was continued for further 3 hours so that steady state condition was achieved. The available equations have been used for determination of dynamic elastic modulus of RPC using UPV and RF measurements. The residual mechanical properties, RF and UPV were plotted as a function of temperature. The result shows that the residual strength increases from room temperature to 300℃. However, above 300℃, it’s decreasing gradually. Various comparisons have been made between residual mechanical strength versus UPV and RF measurements. Relationships have been proposed among residual mechanical properties versus NDTs values. These relationships can be employed for post-fire strength assessment of RPC structures.

关键词： Reactive powder concrete high temperature residual mechanical properties ultrasonic pulse velocity resonance frequency

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Water transport properties for unsaturated cement-based materials

Water transport properties for unsaturated cement-based mate...

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第三届中国国际复合材料科技大会

作者： Chunsheng Zhou Wei Wang Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry and Information Technology Harbin Institute of Technology

The durability performance of cement-based material is actually and mostly determined by the penetration process of deleterious agents and possible chemical and physical reactions between them, where water always plays an important role. In addition, the transport properties of other agents also depend seriously on the water content. It is rather essential to understand the distribution of water and its transport in partially saturated cement-based materials, which are facilitated herein through low-field nuclear magnetic resonance(NMR) technique and gas permeability testing on partially saturated white cement mortar specimens. It is found that most water is stored in inter-layer pores when it is equilibrated with relative humidity below 75%. Due to the marked contraction or swelling of interlayer pores during drying or wetting, the gel pores and inter-hydrate pores are greatly changed while the overall porosity is little altered. At totally drying state, the pore structure of cement-based material becomes obviously coarser, making the gas permeability remarkably larger than water permeability by as large as 2-3 orders of magnitudes. The intrinsic gas permeability obtained on partially saturated specimens reveals that, both the permeability to water and gas depend nonlinearly on the water content, which are well characterized by the models we suggested. Not only the water saturation degree but also the induced pore structure evolution should be incorporated when modelling the transport of water.

关键词： Durability permeability pore structure saturation degree low-field NMR

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Influence of Sewage Sludge and Curing Conditions on the Basic Strength of Silicate Products

Influence of Sewage Sludge and Curing Conditions on the Basi...

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第九届水泥混凝土国际会议

作者： Yading ZHAO Zhenyun YU Ruozhou LIANG Minghao LIU Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Key Lab of Smart Prevention and Mitigating of Industry and Information Technology Harbin Institute of Technology

Stabilization disposal and utilization of the sewage sludge has been an important research topic to be urgently solved,for the problem of large and serious pollution of solid waste emissions of *** study highlighted the variables of the dosages of sewage sludge after dried and ground and curing conditions,basic mechanical properties such as compressive strength and flexural strength of silicate products were *** obtained test results were indicated that there was a decrease in both compressive strength and flexural strength with the increase of sewage sludge content,for the increase of crystallinity,porosity and more internal defects of the *** moisture kept constant,along with the curing temperature and age in the range of 50℃ to 70℃,compressive strength of silicate products was increased,for the increase and compact structure of hydration products and interface transition zone,*** flexural strength demonstrated a decrease when the temperature greater than 70℃.However,when the curing temperature up to 90℃,compressive strength and flexural strength both exhibited a decline with the curing age longer,which was explained by the increase of crystallinity in the interface caused by the conversion of hydration products inside matrix.

关键词： sewage sludge silicate products curing conditions compressive strength flexural strength

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Effect of different fibers on mechanical properties and ductility of alkali-activated slag cementitious material

Effect of different fibers on mechanical properties and duct...

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第二届新型材料与化学工业国际学术会议

作者： J Zhu W Z Zheng C Z Qin Z Z Xu Y Q Wu College of Civil Engineering and Architecture Harbin University of Science and Technology Key Lab of Structures Dynamic Behavior and Control of the Ministry Education Harbin Institute of Technology

The effect of different fibers on mechanical properties and ductility of alkaliactivated slag cementitious material（AASCM） is studied. The research contents include: fiber type（plant fiber, polypropylene fiber）, fiber content, mechanical property index, tensile stressstrain relationship curve, treating time. The test results showed that the compressive strength of two fibers reinforced AASCM was about 90 ~ 110 MPa, and the tensile strength was about 3 ~ 5 MPa. The reinforcement effect of polypropylene fiber is superior to that of plant fiber, and the mechanical properties of polypropylene fiber reinforced AASCM are superior to those of plant fiber, According to the comparison of SEM pictures, the plant fiber and polypropylene fiber are both closely bound with the matrix, and the transition zones are complete and close. Thus, it is proved that plant fiber and polypropylene fiber delay the crack extension and enhance the ductility of AASCM.

关键词： SEM Effect of different fibers on mechanical properties and ductility of alkali-activated slag cementitious material

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Long term mechanical properties of alkali activated slag

Long term mechanical properties of alkali activated slag

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第二届新型材料与化学工业国际学术会议

作者： J Zhu W Z Zheng Z Z Xu Y F Leng C Z Qin College of Civil Engineering and Architecture Harbin University of Science and Technology Key Lab of Structures Dynamic Behavior and Control of the Ministry Education Harbin Institute of Technology

This article reports a study on the microstructural and long-term mechanical properties of the alkali activated slag up to 180 days, and cement paste is studied as the comparison. The mechanical properties including compressive strength, flexural strength, axis tensile strength and splitting tensile strength are analyzed. The results showed that the alkali activated slag had higher compressive and tensile strength, Slag is activated by potassium silicate（KSiO） and sodium hydroxide（Na OH） solutions for attaining silicate modulus of 1 using 12 potassium silicate and 5.35% sodium hydroxide. The volume dosage of water is 35% and 42%. The results indicate that alkali activated slag is a kind of rapid hardening and early strength cementitious material with excellent long-term mechanical properties. Single row of holes block compressive strength, single-hole block compressive strength and standard solid brick compressive strength basically meet engineering requirements. The microstructures of alkali activated slag are studied by X-ray diffraction（XRD）. The hydration products of alkaliactivated slag are assured as hydrated calcium silicate and hydrated calcium aluminate.

关键词： Long term mechanical properties of alkali activated slag

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A novel tuned heave plate system for heave motion suppression and energy harvesting on semi-submersible platforms

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Science China(Technological Sciences) 2016年第6期59卷 897-912页

作者： LIU Kun OU Jin Ping School of Civil Engineering Harbin Institute of Technology Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Institute of Ocean Deep Water Engineering Dalian University of Technology

Deepwater offshore structures such as semi-submersible platforms suffer powerful ocean waves due to their location and site condition. The long distance away from the shore also brings many difficulties to energy supply for the platform operation. How to reduce the response of the platform and convert the wave energy into electrical power is a meaningful topic. In this paper, a tuned heave plate system(THP) is presented and designed to be employed on a semi-submersible platform for heave motion suppression and energy harvesting. This THP system is composed of spring supports, a power take-off system(PTO), and a heave plate. The PTO system is a permanent magnet linear generator(PMLG), which could directly convert the kinetic energy of the heave plate into electronic power. The stiffness of the spring supports is designed based on the principle of the tuned mass damper(TMD). The numerical model of the platform and the THP system is established according to the hydrodynamic analysis results of the platform. The model is tested and modified by scale model tests on the platform in the wave tank. A parameter study, including the size, tuned period, and damping ratio of the THP system, is conducted systematically based on the numerical model. The optimal parameters of the THP are selected due to the maximum heave motion reduction under severe wave conditions in South China Sea. The performance of the semi-submersible with and without the THP system under different wave conditions is analyzed. It is demonstrated that this novel tuned heave plate system could reduce the heave motion of the semi-submersible platform significantly and generate considerable power, which makes the THP system have a broad prospect for development.

关键词： heave motion semi-submersible wave energy harvesting wave energy converter TMD

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