Based on the characteristics of foundation, this paper conjecturally reconstructs the above-ground structures of dwelling remains exposed at the Dadiwan site at Qin’an. In the first phase, houses might have been semi...Based on the characteristics of foundation, this paper conjecturally reconstructs the above-ground structures of dwelling remains exposed at the Dadiwan site at Qin’an. In the first phase, houses might have been semi-subterranean architectures with cone-like roofs. During the second and third phases, houses were also square semi-subterranean architectures with earthen-walls and wooden pillars. Types of roofs include ‘人’ shape two-facets slops, four-facets slops and ‘山’-style four-facets slops. Houses in the forth phase were square above-ground architectures. Roofs were ‘人’ shape two-facets slops. The layout became much more complicated since the structure cooperates with corridors in side-ways and canopy in front of the house.展开更多
This paper reports the recent excavation of Unit Dadiwan06 at the Dadiwan site in Qin’an County, Gansu.A 65 ka chronological framework is established for Dadiwan06 on the basis of absolute dating (AMS 14C and OSL), s...This paper reports the recent excavation of Unit Dadiwan06 at the Dadiwan site in Qin’an County, Gansu.A 65 ka chronological framework is established for Dadiwan06 on the basis of absolute dating (AMS 14C and OSL), stratigraphy, climate change events and archaeology.Artifact distributions reveal patterns of human behavioral variation and adaptation over the past 60 ka, from primitive hunting and gathering to advanced hunting and gathering, to primitive Neolithic agriculture, and finally to advanced Neolithic agriculture.展开更多
During 1970s, the residential remains of the Yangshao Period were discovered at the Dadiwan site in Qin＇an County, Gansu Province, China. With carbon-14 dating, scanning electron microscope （SEM）, thermal expansion...During 1970s, the residential remains of the Yangshao Period were discovered at the Dadiwan site in Qin＇an County, Gansu Province, China. With carbon-14 dating, scanning electron microscope （SEM）, thermal expansion analyzer, polarizing microscope （PLM）, and X ray diffraction （XRD）, the microstructures and chemical compositions of the pottery shard, floor materials of the housing site, kunkur, calcined kunkur, ginger nut （calcium concretion） from the Dadiwan site were analyzed and re- searched. Analysis and simulation tests were also carried out to study the hydratability of calcined ginger nut and calcined kunkur, and the manufacturing process of the residential floors. The research shows that the floor was made of a light concrete formed by the mixture of aggregate of calcinated ginger nut （locally deposited）, red clay and kunkur. The dicalcium silicate （C2S） from the floor material of the housing site is one of the main constituents of modem cement, and the floor is also similar to modem concrete in nature. Therefore, the floor material of the housing site at the Dadiwan site was the earliest man-made concrete in the world ever discovered.展开更多
文摘Based on the characteristics of foundation, this paper conjecturally reconstructs the above-ground structures of dwelling remains exposed at the Dadiwan site at Qin’an. In the first phase, houses might have been semi-subterranean architectures with cone-like roofs. During the second and third phases, houses were also square semi-subterranean architectures with earthen-walls and wooden pillars. Types of roofs include ‘人’ shape two-facets slops, four-facets slops and ‘山’-style four-facets slops. Houses in the forth phase were square above-ground architectures. Roofs were ‘人’ shape two-facets slops. The layout became much more complicated since the structure cooperates with corridors in side-ways and canopy in front of the house.
基金supported by the Funds for Creative Research Groups of China (B06026)National Geographic Society and the Pacific Rim Research Program
文摘This paper reports the recent excavation of Unit Dadiwan06 at the Dadiwan site in Qin’an County, Gansu.A 65 ka chronological framework is established for Dadiwan06 on the basis of absolute dating (AMS 14C and OSL), stratigraphy, climate change events and archaeology.Artifact distributions reveal patterns of human behavioral variation and adaptation over the past 60 ka, from primitive hunting and gathering to advanced hunting and gathering, to primitive Neolithic agriculture, and finally to advanced Neolithic agriculture.
文摘During 1970s, the residential remains of the Yangshao Period were discovered at the Dadiwan site in Qin＇an County, Gansu Province, China. With carbon-14 dating, scanning electron microscope （SEM）, thermal expansion analyzer, polarizing microscope （PLM）, and X ray diffraction （XRD）, the microstructures and chemical compositions of the pottery shard, floor materials of the housing site, kunkur, calcined kunkur, ginger nut （calcium concretion） from the Dadiwan site were analyzed and re- searched. Analysis and simulation tests were also carried out to study the hydratability of calcined ginger nut and calcined kunkur, and the manufacturing process of the residential floors. The research shows that the floor was made of a light concrete formed by the mixture of aggregate of calcinated ginger nut （locally deposited）, red clay and kunkur. The dicalcium silicate （C2S） from the floor material of the housing site is one of the main constituents of modem cement, and the floor is also similar to modem concrete in nature. Therefore, the floor material of the housing site at the Dadiwan site was the earliest man-made concrete in the world ever discovered.
