This paper introduced basic situation and challenges of Block 9, Dongdajie, Chengdu City, expounded basic definition and design concept of "place making", briefed the design scheme from three aspects, namely...This paper introduced basic situation and challenges of Block 9, Dongdajie, Chengdu City, expounded basic definition and design concept of "place making", briefed the design scheme from three aspects, namely planning layout, space environment and architectural style, and concluded the application of the idea of "place making" in Block 9 design scheme in view of the multi-functional urban complex with high plot ratio.展开更多
Cold mixtures with bitumen emulsion are produced at ambient temperature,leading to substantial reductions of energy consumption and atmospheric emissions.In cold recycling applications,cement is normally used to impro...Cold mixtures with bitumen emulsion are produced at ambient temperature,leading to substantial reductions of energy consumption and atmospheric emissions.In cold recycling applications,cement is normally used to improve the mixture performance.Thus,the rheological behavior of cold recycled mixtures is different from that of conventional hot mixtures because it is due to the interaction of fresh bitumen,aged bitumen and cementitious bonds.In this study,we investigated the three-dimensional(3 D)linear viscoelastic(LVE)behavior of a cement-bitumen treated material(CBTM)mixture fabricated using bitumen emulsion and cement.For comparison,we also investigated the 3 D LVE behavior of hot-mix asphalt containing 25%of reclaimed asphalt and fabricated using polymermodified binder.Sinusoidal axial tests on cylindrical specimens,were carried out at various temperatures(from 0℃to 50℃)and frequencies(from 0.1 to 12 Hz).The complex Young’s modulus E~*and the complex Poisson’s ratio v~*were determined through the measurement of axial and transverse strain.We show that when considering E*,CBTM mixtures may be considered thermo-rheologically simple and the Huet-Sayegh model can be used to simulate the frequencyetemperature dependence.On the other hand,when considering v*the behavior of CBTM mixtures is very different from that of hot mix asphalt.In particular,its absolute value is almost constant and very close to 0.15.展开更多
文摘This paper introduced basic situation and challenges of Block 9, Dongdajie, Chengdu City, expounded basic definition and design concept of "place making", briefed the design scheme from three aspects, namely planning layout, space environment and architectural style, and concluded the application of the idea of "place making" in Block 9 design scheme in view of the multi-functional urban complex with high plot ratio.
文摘Cold mixtures with bitumen emulsion are produced at ambient temperature,leading to substantial reductions of energy consumption and atmospheric emissions.In cold recycling applications,cement is normally used to improve the mixture performance.Thus,the rheological behavior of cold recycled mixtures is different from that of conventional hot mixtures because it is due to the interaction of fresh bitumen,aged bitumen and cementitious bonds.In this study,we investigated the three-dimensional(3 D)linear viscoelastic(LVE)behavior of a cement-bitumen treated material(CBTM)mixture fabricated using bitumen emulsion and cement.For comparison,we also investigated the 3 D LVE behavior of hot-mix asphalt containing 25%of reclaimed asphalt and fabricated using polymermodified binder.Sinusoidal axial tests on cylindrical specimens,were carried out at various temperatures(from 0℃to 50℃)and frequencies(from 0.1 to 12 Hz).The complex Young’s modulus E~*and the complex Poisson’s ratio v~*were determined through the measurement of axial and transverse strain.We show that when considering E*,CBTM mixtures may be considered thermo-rheologically simple and the Huet-Sayegh model can be used to simulate the frequencyetemperature dependence.On the other hand,when considering v*the behavior of CBTM mixtures is very different from that of hot mix asphalt.In particular,its absolute value is almost constant and very close to 0.15.
