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Ma J.T.,Wuhan University of Technology | Tu L.Q.,Wuhan University of Technology | Tu L.Q.,Wuhan Harbour Engineering Design and Research Co. | Shui Z.H.,Wuhan University of Technology | Chen W.,Wuhan University of Technology
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2010

Shrinkage-compensating concrete can enhance the permeability and strength. In addition, expansive admixture can densify concrete to advance the carbonation resistance ability. Due to special quality of ettringite, the relative humidity of curing environment has significant effect on the carbonation rate of concrete. This paper discusses the influence of environmental humidity on carbonation rate of shrinkage-compensating concrete. Four different curing conditions were set up, namely the natural environment (RH 60%), standard environment (RH 90%), early age water curing environment for 3 d and 7 d. After curing in these four environments for 28 d, an accelerated carbonation test was performed. Micro-hardness analysis was used to evaluate surface hardness, which depends on, to a great degree, the carbonation depth. TG-DSC analysis was used to study Ca(OH)2 content gradient in the surface layer of concrete in different environment. The results show that natural condition lead to a relatively worse carbonation degree, curing in water for 3 d is harmful to the carbonation resistance, while curing in water for 7 d lead to an equivalent carbonation degree with standard condition, which show the most improvement to carbonation resistance ability. Source


Li J.H.,Wuhan Harbour Engineering Design and Research Co. | Li J.H.,China Communications Construction Company Ltd. | Tu L.Q.,Wuhan Harbour Engineering Design and Research Co. | Tu L.Q.,China Communications Construction Company Ltd. | And 5 more authors.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2010

The effects of steam curing on mechanical properties, drying shrinkage, cracking sensitivity, anti-permeability, and carbonation resistance of C50 shield segment concrete were investigated, which were compared with the standard curing conditions. The results indicated that steam curing could increase early strength of concrete and reduce its drying shrinkage. However, steam curing reduced later strength of concrete, increased its crack sensitivity and deteriorated its anti-permeability and carbonation resistance. Moreover, the incorporation of fly ash could improve the durability of steam-cured concrete. Source


Qin M.Q.,Wuhan Harbour Engineering Design and Research Co. | Qin M.Q.,China Communications Construction Company Ltd. | Tu L.Q.,Wuhan Harbour Engineering Design and Research Co. | Tu L.Q.,China Communications Construction Company Ltd. | And 5 more authors.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2010

This paper presents the Location, the structural design as well as the anti-corrosion and the pilot programs of the marine exposure station of Zhoushan Archipelago seas sea-crossing bridges. Subjected to the marine environment, the concrete structures in serve with different mixing proportions, cover thickness, additional anti-corrosion measures such as rust-preventing agent, coating, penetration crystalline waterproof material, silicone and permeable fabric were studied. Those results obtained provide important information for the maintenance of marine concrete and the structural design of sea-crossing bridges in the above sea area. Source


Tu L.Q.,Wuhan University of Technology | Tu L.Q.,Wuhan Harbour Engineering Design and Research Co. | Tu L.Q.,China Communications Construction Company Ltd. | Dong C.,Wuhan Harbour Engineering Design and Research Co. | And 6 more authors.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2010

The electrochemical performance of the anodes was measured in the reinforced concrete test block in artificial sea water. Their chemical composition, metallographic structure and surface morphology were analyzed. It was found that concrete mix proportion and the covering layer thickness had an impact on the performance of sacrificial anodes. The thermal-sprayed zinc alloy anodes had a more negative corrosion potential and larger galvanic current than metallurgy ones in the same conditions. They had similar chemical composition. But metallographic structure showed that the structure of thermal-sprayed zinc alloy anodes was a loose porous. This structure had the catalytic effect on the anodes electrochemical reactions and made the anodes the electrochemical exchange current density increase and the corrosion potential move to negative direction. Source

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