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Wang K.-L.,China Academy of Building Research | Wang K.-L.,Shandong Provincial Water Resources Research Institute | Liu L.,Jinan Delitai Building Materials Concrete Company | Sui T.-B.,China Academy of Building Research | And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

Anti-shear (cut) parameters of concrete-dam bedrock is concerned with dam design and running safely. Based on specificity of rubber power that can increase particle friction and disperse energy in concrete, anti-shear(cut) performance of dam bedrock-ordinary concrete is compared with that of bedrock-rubber powder modified concrete by the test on the spot of Tangshui reservoir. The results show that the anti-shear(cut) performance of bedrock-rubberized concrete is better than that of bedrock-ordinary concrete. Anti-cut friction coefficient of rubberized concrete-bedrock with 1.344 is increased by 70.1%, compared with that of ordinary concrete-bedrock with 0.790; and cohesion of rubberized concrete-bedrock is almost equal to that of ordinary-concrete. As far as anti-shear parameters is concerned, anti-shear friction coefficient of rubberized concrete-bedrock with 1.108 is increased by 62.2% compared with that of ordinary concrete-bedrock with 0.683. Cohesion of rubberized concrete -bedrock with 0.138 MPa is as almost two times as that of ordinary-concrete-bedrock with 0.061 MPa, And mechanism that rubber powder can improve anti-shear(cut) performance of dam bedrock-concrete is analyzed. So an effective technical measures that increases anti-shear(cut) parameter of dam bedrock-concrete is provided.


Wang K.,China Academy of Building Research | Wang K.,Shandong Provincial Water Resources Research Institute | Sui T.,China Academy of Building Research | Liu L.,Jinan Delitai Building Materials Concrete Company | And 3 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2010

In-situ anti-shear (cut) performance of bedrock-ordinary Portland cement concrete was compared with that of bedrock-high Belite cement concrete on the spot. The results show that the anti-shear(cut) performance of bedrock-high Belite cement concrete was better than that of bedrock-ordinary Portland cement concrete. A linear regression formula for the anti-cut performance of bedrock-high Belite cement concrete is τ = 1.204 δ + 0.278(δ is normal stress on shear plane) and the formula for the anti-shear performance is τ'= 1.119 δ+0.150; The empirical formula for the anti-cut performance of bedrock-ordinary Portland cement concrete is τ= 0.790 δ + 0.257 and the formula for the anti-shear performance is τ'= 0.683 δ + 0.061. The mechanism of the anti-shear(cut) performance of bedrock-high Belite cement concrete is also discussed.


Wang K.,Shandong Provincial Water Resources Research Institute | Hu T.,Qingzhou Renhe Reservoir Administrative Office | Liu L.,Jinan Delitai Building Materials Concrete Company
Advanced Materials Research | Year: 2012

Influence of permeated crystalline materials on durability of hydraulic concrete was studied by impermeability test methods after sulfate attack and freeze-thaw cycling. Microstructure of concrete was analyzed and characterized with SEM and MIP. The results showed that impermeability pressure of concrete with permeated crystalline materials was more than that of standard concrete after sulfate attack and freeze-thaw cycling. Permeated crystalline materials improved on performance of concrete for sulfate attack and freeze-thaw, because that microstructure of interfacial transition zone of concrete with permeated crystalline materials was compact and its pore size distribution was more than that of standard concrete. There were more content of less harmful pore with diameter 20nm∼100nm and less content of harmful pore with diameter100nm∼200nm and more than 200nm in concrete with permeated crystalline materials than in standard concrete. © (2012) Trans Tech Publications, Switzerland.


Wang K.,Shandong Jiaotong University | Sui T.,Sinoma International Engineering Co. | Liu L.,Jinan Delitai Building Materials Company | Xu S.,Shandong Provincial Water Resources Research Institute
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2014

The influence of tensile properties of high Belite cement concrete on the crack of concrete was investigated. The tensile strength and ultimate tension of high Belite cement concrete were compared with those of Portland cement concrete by splitting tensile test and axial tensile test. The microstructures of interfacial transition zones of high Belite cement concrete and Portland cement concrete were characterized by microhardness measurement, scanning electron microscopy and X-ray energy dispersive spectroscopy. The results reveal that the tensile strength and ultimate tension of high Belite cement concrete are better than those of Portland cement concrete at the same ages and water cement ratio, and the later-age tensile strength of high Belite cement concrete and its rate are great. The thickness of high Belite cement concrete is 25 μm less than that of Portland cement concrete. The microhardness of high Belite cement concrete is 8. 9MPa more than that of Portland cement concrete. The ratio of Ca to Si is low and the adhesion of interface in high Belite cement concrete is relatively perfect, compared to Portland cement concrete. Therefore, the microstructure of interfacial transition zone and the tensile properties of high Belite cement concrete are better than those of Portland cement concrete. ©, 2014, Chinese Ceramic Society. All right reserved.


Wang K.,Shandong Jiaotong University | Sui T.,Sinoma International Engineering Co. | Xu S.,Shandong Provincial Water Resources Research Institute | Liu L.,Ji nan Delitai Building Materials Company
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2013

Prevention of bedrock concrete cracking can improve the durability and operation safety of hydraulic structures. In this work, the cracking mechanism and restrained strain of rubber aggregate motar were studied through an experiment of restrained loop with resistance strain gauges, scanning electron microscrope and mercury porosimeter. The strain gauges were buried into bedrock concrete for measurement of restrained strain of rubber aggregate concrete. The results reveal that the rubber aggregate material under stressing causes a change in the shape of pores in the cement paste matrix and part of its stress is released. In the condition of ordinary motar cracking, this material develops curing strain and larger restrained strain, so the concrete does not crack. At the ages of 45d and 90d, the restrained strain in ordinary bedrock concrete is reduced quickly and its cracks start developing. Thus, rubber aggregate can improve the performances of bedrock concrete against cracking. This study provides an effective technical measure for prevention of bedrock concrete cracking.


Li G.,Hohai University | Wu J.,Hohai University | Wu J.,State Key Laboratory for Geomechanics and Deep Underground Engineering | Ge W.,Shandong Provincial Water Resources Research Institute
Construction and Building Materials | Year: 2015

Abstract In this study, the end anchorage device for large diameter FRP bar was firstly developed, based on which the effect of loading rate on the direct tensile mechanical properties of 25 mm diameter GFRP bars was tested, and the anticorrosion properties of a newly developed type of FRP bar, the basalt-glass fiber reinforced polymer (B-GFRP) bars with different thicknesses of basalt FRP protecting layers (0, 1, 3 and 5 mm) were investigated. The results show that, with the increase of loading rate, the tensile strength and elongation ratio of GFRP bar increase considerably, while the elastic modulus remains roughly constant. The addition of BFRP protecting layer is also proved to be an effective way to enhance the resistance of GFRP bars to the chemical attacks. © 2015 Elsevier Ltd.


Suzhen C.,Shandong Provincial Water Resources Research Institute | Shangjie X.,Shandong Provincial Water Resources Research Institute | Rong C.,Shandong Provincial Water Resources Research Institute | Wangkeliang,Shandong Provincial Water Resources Research Institute
Advanced Materials Research | Year: 2012

Through laboratory testing, the main properties and effects of rubber particle and water-binder ratio of plastic concrete are researched. The results indicate if the rubber particle of plastic concrete with certain water-binder ratio increases and its elastic modulus decreases, there is no effect to the permeability coefficient of plastic concrete basically. If the water-binder ratio of plastic concrete is lower, its elastic modulus increases but permeability coefficient reduces distinctly. Therefore, the comprehensive utilization of the test of rubber particle with change of water-binder ratio can make up plastic concrete with lower elastic modulus and smaller permeability coefficient. It will provide a new method to solve the problem of plastic concrete with higher elastic modulus and larger permeability coefficient and meet the needs of a project. © (2012) Trans Tech Publications, Switzerland.


Wang K.,Shandong Provincial Water Resources Research Institute | Hu T.,Qingzhou Renhe Reservoir Administrative Office | Xu S.,Shandong Provincial Water Resources Research Institute
Advanced Materials Research | Year: 2012

Influence of permeated crystalline waterproof materials on permeability and automation healing of concrete was studied by impermeability test methods for two and a few times. Microstructure of concrete was analyzed and characterized with SEM and MIP. The results showed that permeated crystalline waterproof materials had function of durable self-repairing and impermeability of concrete improved with increasing of permeated crystalline waterproof materials. It was because that reaction crystallization of active component in permeated crystalline materials and Ca(OH) 2 in concrete filled interfacial of concrete and cement paste matrix. In addition, pore size distribution of concrete with permeated crystalline waterproof materials was so good that there were more content of less harmful and less content of harmful pore in concrete. Therefore, most probable pore diameter of concrete reduced and impermeability of concrete improved. © (2012) Trans Tech Publications, Switzerland.

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