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Liu H.,Wuhan University of Technology | Liu H.,Communications Planning and Design Institute of Hubei Province | Lu Z.,Wuhan University of Technology | Peng Z.,Wuhan University of Technology
Materials and Structures/Materiaux et Constructions | Year: 2015

Different from ordinary Portland cement concrete, the inorganic polymer concrete is a new type of concrete and is made through replacing Portland cement with inorganic polymer material in common concrete. To popularize and apply inorganic polymer concrete in prestressed structure, this paper carried out a series of experimental study on prestressed beam of inorganic polymer concrete for the purpose of providing experimental basis and theoretical grounds for its application in practical engineering. Firstly, the basic mechanics properties (compressive strength, modulus of elasticity, Poisson’s ratio and splitting tensile strength) of inorganic polymer concrete were presented and discussed. Secondly, in order to investigate its serviceability, durability, and stability of member subjected to load for long-term, the shrinkage and creep tests for inorganic polymer concrete have been studied as well. Thirdly, based on the test research of basic mechanics performance, test researches on prestressed beams of inorganic polymer concrete were carried out. Through these tests, this paper put forward a kind of new model to predict the shrinkage and creep for inorganic polymer concrete, and presented a calculation method for prestressing loss due to anchorage slip and prestressed tendons retraction when the reverse friction length is longer than the total length of member, and obtained the calculation formulas of cracking and ultimate load for prestressed beam of inorganic polymer concrete. The theoretical analysis and experimental results are in good conformity. These show that the theoretical model, method and formula suggested by this paper for inorganic polymer concrete member are feasible. © 2014, RILEM. Source

Xie J.,Wuhan University of Technology | Xiao Y.,Technical University of Delft | Wu S.,Wuhan University of Technology | Huang J.,Communications Planning and Design Institute of Hubei Province
Construction and Building Materials | Year: 2012

Asphalt pavements are suffering from severe stress-related failures such as cracks, which are mainly caused by fractures in asphalt mixtures. Several evaluating and analyzing techniques are available on evaluating fracture characteristic of asphalt mixture. Among them, the direct tensile test (DTT) is frequently applied in laboratory research due to its benefits over indirect tensile test (IDT) for the increasing use of finer aggregate gradation and polymer modified asphalt in asphalt mixtures. The major objective of this study is to determine the effects of binder type, temperature and strain loading rate on fracture characteristics of gneiss prepared asphalt mixtures. Initially, specimens were prepared by Superpave gyratory compactor and subsequently processed carefully to required dimension. Then direct tensile tests were conducted with linear strain-increasing controlling mode at different temperatures (15 °C, 25 °C) in combined with various strain loading rates (0.1, 0.5, 1 and 18 mm/min). Test results indicated that the direct tensile strength (DTS) decreased as temperature increased at the same strain loading rate. Additionally it was shown that the DTS got larger at higher strain loading rate. Besides, the image analysis related to fracture mode at splitting cross section indicated that adhesive fracture was dominant at lower temperature, while at higher temperature the main fracture mode was cohesive fracture. Furthermore, relative higher stress loading rate could increase possibility of adhesive fracture. © 2011 Elsevier Ltd. All rights reserved. Source

Luo H.,CAS Wuhan Institute of Rock and Soil Mechanics | Luo H.,Wuhan University | Chen S.,CAS Wuhan Institute of Rock and Soil Mechanics | Wang G.,Communications Planning and Design Institute of Hubei Province
Disaster Advances | Year: 2014

The stability-losing of the counter-inclined stratified rock slope is one of the most urgent problems in engineering geology and rock mechanics. The catastrophic model with cusp point on the basis of catastrophic theory is established which is based on the rock mass structural characteristic of the counterinclined stratified rock slope and the geological model and the bulking-tearing deformation. The conditions and mechanism of sudden change of stability-loss are studied as well. The critical stability-loss deepness of an instability point is given by the model. The method of stability evaluation is carried out based on catastrophic theory. A case for Zhangjiazui high cutting slope is studied by stability evaluation based on catastrophic theory. The results showed that the stability coefficient is 1.31 and the method of stability evaluation is effectively successful in the counterinclined stratified rock slope. Source

Hu Y.-W.,Communications Planning and Design Institute of Hubei Province | Zeng J.-H.,China Railway Siyuan Survey and Design Group Co.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2010

With the characteristics of being long-span, slender and flexible, the nonlinear aerostatic stability program of long-span suspension bridge is remarkable. Based on increment and inner-outer iteration method of analyzing nonlinear aerostatic problem, a program for analyzing nonlinear aerostatic problem of long-span bridges is developed using ANSYS/APDL programming language. Using this program, the full range nonlinear aerostatic stability of long-span suspension bridge is accomplished; also, the process and mechanism of long-span suspension bridge's aerostatic stability are discussed. Source

Ma L.X.,Wuhan University of Technology | Wu S.P.,Wuhan University of Technology | Huang J.F.,Communications Planning and Design Institute of Hubei Province
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2010

In this work, the chemical properties of asphalt were evaluated during the laboratory aging. The rolling thin film oven (RTFO), termed as short-term aging, and pressurized aging vessel (PAV), termed as long-term aging. Tests were used to simulate the laboratory aging of this asphalt. The performance characteristics of asphalt depends the chemical composition of asphalt. NMR spectroscopy enables etailed information about the Carbon-and-hydrogen types of asphalt without separating it into different components. Carbon and proton NMR measurements of asphalt showed that isomerization was the main chemical reactions of hydrocarbon groups following aging. The Corbett fractionation procedure was used to separate fresh and aged asphalts into four generic fractions, namely; asphaltenes, aromatics, resins and saturates were applied to evaluate the chemical changes that occurred during the aging processes. Source

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