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Jiao C.,Guangzhou University | Lai X.,Guangzhou University | Hu Z.,West China Branch of First Construction Engineering Ltd Company of China Construction Third Engineering Bureau | Wang L.,Guangzhou Municipal Construction Group Co. | Cheng C.,Guangzhou University
Jiangsu Daxue Xuebao (Ziran Kexue Ban)/Journal of Jiangsu University (Natural Science Edition) | Year: 2015

To solve the crack, empty, tympanic and desquamate quality problems in wall plaster layer, seven groups of polymer mortar with different mixture ratios and one group of normal cement mortar were prepared based on previous achievements of the authors' research group. The mortar properties of consistency, layered degree, setting time, bonding strength, compressive strength and flexural strength were determined. The experiment results show that the adding of polypropylene fiber, emulsion powder, cellulose ether, wood fiber and expansive agent can improve mixability and water-retaining property of mortar with enhanced working performance and anti-cracking ability of mortar, and can reduce the ratio of compressive strength to flexural strength of mortar with strengthened bond strength between walls and plaster mortar layer and with prolonged setting time of fresh mortar. The improving mechanism of the above five additives to mortar performance is analyzed, and three groups of optional selection polymer mortar are obtained as references for engineering application. ©, 2015, Journal of Jiangsu University (Natural Science Edition). All right reserved.

Li L.,Guangdong University of Technology | Xie W.,Guangzhou Municipal Construction Group Co.
Advanced Science Letters | Year: 2011

This paper investigates a high strength concrete that has a 100 MPa compressive strength and excellent fluidity and durability. It is made of the traditional materials and craftwork. The mixture proportion of this concrete that has low water cement ratio and low content of cementing material has been put forward. The mechanical performance test, such as the compressive strength test, splitting-tensile strength test, flexural strength test, axial compressive strength test and static elastic modulus test have been carried out. The physical performance tests, such as the electric flux, permeability and scanning electron microscope (SEM) have been implemented. The fire test has been taken to investigate the variation of compressive strength, flexural strength and splitting-tensile strength of the high strength concrete (HSC) after 500 °C and 800 °C temperature. The influence of different high temperatures on appearance variation and mass loss of concrete has been investigated. Through the SEM observation, the micro structural variation of the gel and the characteristics of performance variation of the high strength concrete, caused by fire, have been studied. © 2011 American Scientific Publishers All rights reserved.

Jiao C.,Guangzhou University | Ding M.,Guangzhou University | Lai X.,Guangzhou University | Hu Z.,Guangxi Branch Company of First Construction Engineering Co. | Wang L.,Guangzhou Municipal Construction Group Co.
Jiangsu Daxue Xuebao (Ziran Kexue Ban)/Journal of Jiangsu University (Natural Science Edition) | Year: 2014

To investigate the anti-seepage behavior of polypropylene fiber reinforced mortar, the experiments of construction performance and mechanical properties of consistency, stratification, apparent density, setting time, compressive strength, flexural strength, tensile and adhesion strength, alkali resistance, heat resistance, water absorption rate, drying shrinkage rate and impermeability pressure were conducted. The quality benchmark ratio (Mf) of polypropylene fiber was ranged from 0 to 0.900%. The experimental results show that with the increasing of Mf, consistency, stratification and adhesion strength of polypropylene fiber reinforced mortar are decreased, and flexural strength increases first with later decreasing, while the water absorption rate and drying shrinkage rate decrease first with later increasing. The impermeability of mortar is obviously improved when Mf increases from 0 to 0.450%, and the impermeability of mortar is reduced gradually when Mf increases from 0.450% to 0.900%. ©, 2014, Journal of Jiangsu University (Natural Science Edition). All right reserved.

Wang L.,South China University of Technology | Wang L.,Guangzhou Municipal Construction Group Co. | Wu B.,South China University of Technology | Gao J.,Guangzhou Municipal Construction Group Co. | Wang F.,South China University of Technology
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2013

To identify the tension of in-service cable expediently and accurately, a cable tension identification method based on static testing measures is proposed by taking cable stress stiffening effect and principle of static equilibrium into account. According to the analysis on the process of cable tension identification and the key technique, a new compound clamp type with the soft metal lining is proposed. The rule of the contact distortion evolvement between the clamp and the cable is analyzed by dynamic nonlinear explicit analysis method, and the law of the friction change following the clamping force is studied. Thus, the reasonability and feasibility of this method is theoretically illuminated. The identified tension only depends on the displacement of load application point and the load force. The proposed method avoids the drawback of normal cable measuring methods where the measuring accuracy is greatly affected by cable boundary conditions and values of material parameters. The tension measured in the method is only related to the displacement of force point and the value of force. Therefore, it provides a new idea for cable tension identification of flexible cable.

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