Influence of cement on low-temperature property of granite asphalt mixtures
Combined with the application of granite asphalt mixtures in the pavement project along the Ma-Wu Expressway. In this paper, the amount of 20%, 40%, 60%, 80% cement was in equivalent replacement of common filler. The effects of cement on low-temperature property of granite asphalt mixtures were investigated by indirect tensile strength and three-point bend test, obtained the variation of cement with different admixture amounts influence on granite asphalt mixtures, than the optimum mix amount has been found. Experimental results showed that the cement additive improved the low-temperature property and the optimum mix amount of cement was 40%∼60%, which possesses guiding significance for ensuring bituminous pavement project quality.
EVALUATION OF INDIRECT TENSILE TEST (IDT) PROCEDURES FOR LOW-TEMPERATURE PERFORMANCE OF HOT MIX ASPHALT
This report presents the findings of a research project to evaluate the use of the indirect tensile creep and strength test procedures in AASHTO Standard Method of Test T322-03 in mixture and structural design methods for hot mix asphalt. The report will be of particular interest to pavement design and materials engineers in state highway agencies, as well as to materials suppliers and paving contractor personnel who are responsible for the design and evaluation of hot mix asphalt mixtures and pavements.
Evaluation of buckling load and dynamic performance of steel shear wall retrofitted with strips made of shape memory alloy
One of the most imperfections of the steel shear wall is out of plane displacements that cause severe damage in both structural and non-structural elements. In this paper, the effects of shape-memory alloys on steel shear walls are investigated. First, a numerical analysis using the finite element method in ABAQUS software has been carried out according to an experimental test. The results of the numerical analysis have been verified with experimental results. Next, shape-memory alloy fibers have been added vertically and horizontally to various parts of the steel shear wall. The results show that retrofitting with the shape-memory alloy reduces the out-of-plane displacement of the steel shear wall under both cyclic and seismic loadings. Besides, the buckling load in the steel shear wall increases when it is retrofitted with the shape-memory alloy. Also, the total out-of-plane movement (accumulated absolute displacements) of the steel shear wall and non-structural damage are controlled by the characteristic of a shape-memory alloy material called “super-elastic”.