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Fatigue Property of Basalt Fiber-Modified Asphalt Mixture under Complicated Environment

Journal of Wuhan University of Technology(Materials Science) 2014年第5期29卷 996-1004页

作者：郑元勋 CAI Yingchun ZHANG Guanghai FANG Hongyuan College of Water Conservancy and Environment Zhengzhou University The Faculty of Infrastructure Engineering Dalian University of Technology

The fatigue property of asphalt mixtures under complicated environment （low-temperature bending performance, chloride penetration, freezing-thawing cycle and their coupling effect） and the improvement effect for relevant property of basalt fiber-reinforcing asphalt mixture under complicated environment are studied. Two grading types of asphalt mixtures, AC-16I and AC-13I, are chosen, whose optimum asphalt-aggregate ratio and optimum dosage of basalt fiber are determined by the Marshall test. The standard specimens are made firstly, and then the low temperature bending tests of asphalt mixture and basalt fiber-reinforced asphalt mixture under the coupling effect of the chloride erosion and freezing-thawing cycle have been carried out. Finally, the fatigue property tests of asphalt mixture and basalt fiber-reinforced asphalt mixture under complex environment are performed on MTS material testing system. The results indicate that the tensile strength, the maximum curving tensile stress, the curving stiffness modulus, and fatigue properties of asphalt mixture are influenced by the coupling effect of the chloride erosion and freezing-thawing cycle. The low-temperature bending performance and fatigue property of asphalt mixtures under complicated environment can be greatly improved by adding moderate basalt fiber. The dense gradation asphalt mixture possesses stronger ability to resist adverse environmental effects under the same condition.

关键词： asphalt mixture basalt fiber the chloride erosion freezing-thawing cycle the coupling effect low-temperature performance fatigue property

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The effect of confining boundary on soil deformation in one dimensional frost heave tests and the theoretical volume correction

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Research in Cold and Arid Regions 2013年第5期5卷 587-590页

作者： XueWen Zhao Xu Li JianKun Liu Yu Zhang School of Civil Engineering Beijing Jiaotong University Qinghai Research and Observation Base Key Laboratory of Highway Construction & Maintenance Technology in Permafrost RegionsMinistry of Transport Lanzhou Jiaotong University

Frost heave is one of the major complications in highway construction in cold regions. Laboratory experiments are im- portant in the study frost heave behavior of soils, and one-dimensional frost heave experiments are the easiest way to evaluate the soil frost heave potential. In a one dimensional frost heave test, the deformation in axial direction is non-uniform because of the confining effect of the cutting ring＇s sidewall. If the effect of confining boundary on soil de- formation is ignored, the deformation will be over-estimated. In this paper, the effect of confining boundary on soil de- formation is theoretically studied and a volume correction method is developed and applied to the frost heave test of a sulfite saline soil. Test results demonstrate that the sulfite saline soil will expand to a loose, low-density state after several freezing-thawing cycles under the condition of zero axial stress.

关键词： freezing-thawing cycle critical void ratio one-dimensional frost heave test

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Change in Grain-Size Composition of Lignite under Cyclic freezing-thawing and Wetting-Drying

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Natural Resources 2024年第1期15卷 17-27页

作者： Natalia S. Batugina Vladislav I. Fedorov Chersky Institute of Mining of the North Siberian Branch Russian Academy of Sciences Yakutsk Russia

The paper presents the change in grain-size composition of lignite under cyclic freezing-thawing (FTC) and wetting-drying (WDC). The article shows that in the spring and autumn periods the lignites can be subjected to repeated freezing-thawing and wetting-drying, which determines the possibility of changing their grain-size composition and structure. Experimental studies in laboratory conditions on the influence of cyclic freezing-thawing (FTC) and wetting-drying (WDC) on the quality indicators of lignites have been carried out, their granulometric (fractional) composition has been studied. freezing-thawing cycle conditions are as follows (FTC): minimum exposure temperature: -20°C;maximum: +5°C;relative humidity: 30%;number of processing cycles: 3. Wetting-drying cycles are as follows (WDC): drying temperatures are +20, +40, +60, +80°C, drying time 90 minutes, the coals are further subjected to rain (soaking) for a period of water saturation to humidity of 30% - 40% and dry again. The number of wetting-drying cycles is 3 times. The tests have revealed the destructive effects of FTC and WDC on the samples of lower metamorphic grade coal, and the cycles of wet-dry lead to the much higher yield of fine sizes (-6+0;-13+0 mm) than the cycles of freeze-thaw. Furthermore, it is found that the increase in the yield of fines depends on the heating temperature: coal disintegration proceeds more intensively at a higher temperature of drying.

关键词： Lignite freezing-thawing cycle Wetting-Drying cycle Grain Size Composition Dust Coal Storage Loss Quality

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